Liebert Himod - Faulkner Haynes & Associates · 2017-11-29 · Precision Cooling For Business-Critical Continuity Liebert Himod™ Installation Manual - 8, 10 & 12 Tons, 60Hz ˜˚˛˝˙ˆˇ˚ˆ˘

Precision CoolingFor Business-Critical Continuity

Liebert Himod™

Installation Manual - 8, 10 & 12 Tons, 60Hz

DISCONTINUED PRODUCT


i

TABLE OF CONTENTS

PRODUCT MODEL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.1 System Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 System Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22.1 Room Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.2 Equipment Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3 Equipment Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3.1 Handling With Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3.2 Removal of Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.4 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.5 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.5.1 Drain Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.6 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7 Balancing Air Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.7.1 Under-Floor Discharge Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222.7.2 Ducted Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222.7.3 Plenum Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.0 AIR COOLED MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233.1 Condenser Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23


3.2.1 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.2.2 Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.2.3 Lee-Temp/Flood Back Head Pressure Control Condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.3 Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.4 Fan Speed Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.4.1 Materials Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253.4.2 Dehydration/Leak Test and Charging Procedures for R407C or R22 . . . . . . . . . . . . . . . . . . . 263.4.3 Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.5 Lee-Temp/Flood Back Head Pressure Control Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.5.1 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.5.2 Materials Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.5.3 Dehydration/Leak Test and Charging Procedures for R407C or R22 . . . . . . . . . . . . . . . . . . . 303.5.4 Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31


ii

4.0 GLYCOL/GLYCOOL COOLED MODELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .334.1 Drycooler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.2 Drycooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33


4.3.1 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334.3.2 Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334.3.3 Pump and Drycooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.4 Glycol Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.4.1 Expansion Tanks, Fluid Relief Valves and Other Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5 Filling Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.5.1 Preparing the System for Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354.5.2 Glycol Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.5.3 Filling the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.6 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.7 Glycol Regulating Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.7.1 Standard Valve-150psig (1034kPa) & High Pressure Valve-350psig (2413kPa) Systems. . 404.7.2 Testing Valve Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.0 DUAL COOL MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .415.1 Chilled Water Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.2 Dual Cool General Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.0 MOTOR/BLOWER/AUTO-TRANSFORMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .426.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.2 Blower Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.3 High Efficiency Filters and Related Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.3.1 Additional Pressure Drop: 60-65% Filters Substituting 20% Filters . . . . . . . . . . . . . . . . . . . 46

6.4 Standard Unit Auto-Transformer Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.5 Field Adjustments to Air Volume and/or External Static Pressure . . . . . . . . . . . . . . . . . . . 50

6.5.1 Procedure to Make a Field Wiring Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.6 Example of Field Adjustment to Air Volume and/or External Static Pressure . . . . . . . . . . 53

7.0 R407C REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .557.1 Technical Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

8.0 ANCILLARY ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .578.1 Condensate Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.2 Base Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.3 Fresh Air Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57


iii

FIGURESFigure 1 Himod secured to hand trucks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Figure 2 Upflow (HMU) cabinet and floor planning dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 3 Base module dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 4 Downflow (HMF) cabinet and floor planning dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 5 Downflow (HMF) floor planning dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 6 Piping connections for air cooled units—upflow models (HMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 7 Piping connections for air cooled units—downflow models (HMF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Figure 8 Piping connections for air dual cool units with Econ-O-Coil—upflow models (HMU) . . . . . . . . . . . . . . 12Figure 9 Piping connections for air dual cool units with Econ-O-Coil—downflow models (HMF) . . . . . . . . . . . . 13Figure 10 Piping connections for glycol cooled units—upflow models (HMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 11 Piping connections for glycol cooled units—downflow models (HMF) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 12 Piping connections for GLYCOOL cooled units—upflow models (HMU) . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 13 Piping connections for GLYCOOL cooled units—downflow models (HMF) . . . . . . . . . . . . . . . . . . . . . . 17Figure 14 Piping connections for glycol dual cool units—upflow models (HMU). . . . . . . . . . . . . . . . . . . . . . . . . . .18Figure 15 Piping connections for glycol dual cool units—downflow models (HMF). . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 16 Electrical field connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 17 Air cooled condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 18 Air cooled fan speed control general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Figure 19 Air cooled Lee-temp general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Figure 20 Drycoolers and pump packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Figure 21 Glycol general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Figure 22 GLYCOOL general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Figure 23 Valve adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Figure 24 Blower curves - HMF/HMU28A/G, HMF/HMU28K/D/H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43Figure 25 Blower curves - HMF/HMU34A/G, HMF/HMU34K/D/H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44Figure 26 Blower curves - HMF/HMU40A/G, HMF/HMU40K/D/H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45Figure 27 Additional pressure drop for 60-65% filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Figure 28 Example of auto-transformer factory wiring for model HMU40K/D/H w/460V input voltage . . . . . . . . 49Figure 29 Transformer location, arrangement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Figure 30 Field adjustment example using model HMU28K/D/H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Figure 31 R407C refrigeration cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

TABLESTable 1 Unit net weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Table 2 Recommended free area ft2 (m2) for grilles or perforated panels at output velocities of 550

and 600 FPM (2.8 and 3.1 m/s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Table 3 Recommended line sizes — OD copper (inches)* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Table 4 Air cooled condenser statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Table 5 Indoor unit refrigerant charge lbs (kg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Table 6 Line charges—refrigerant per 100 ft. (30 m) of Type “L” copper tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Table 7 Condenser refrigerant charge lbs. (kg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Table 8 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Table 9 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31Table 10 Room dew point temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Table 11 Indoor unit glycol volume approximate gallons (liters) max.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35Table 12 Volume in standard Type “L” copper piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35Table 13 Ethylene glycol concentrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36Table 14 Drycooler data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Table 15 Glycol pump data* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Table 16 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40Table 17 Factory settings for 208&230 V-60Hz units (unit voltage code C or D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47Table 18 Factory settings for 460 Volt - 60 Hz units (unit voltage code: A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48Table 19 Settings for 208 or 230V- 60 Hz units (unit voltage code: C or D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51Table 20 Settings for 460V- 60 Hz units (unit voltage code: A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52Table 21 R407C saturated vapor/liquid temperature/pressure data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56


iv

PRODUCT MODEL INFORMATION

H M U 2 8 A 1 A A E S

Himod Air Discharge Capacity Cooling Type Refrigerant Voltage-ph-Hz Controls Reheat Humidifier

U=Upflow kW A=Air Cooled 1=R407C A=460-3-60 A=Advanced E=Electric S=Steam Gen

F=Downflow 28 G=Glycol 0=R22 C=208-3-60 G=Advancedw/Graphics

0=none 0=none

34 K=GLYCOOL D=230-3-60

40 D=Dual Coolw/Air

H=Dual Coolw/Glycol


Introduction 1

1.0 INTRODUCTION

1.1 System DescriptionsThe following features are included as standard in all room units regardless of the type of system: slab coil, 4" filter, individual high voltage fused protection, and fan assemblies. Units may be ordered with or without a steam generating humidifier and with or without an electric reheat.

Each configuration can operate with either Advanced Microprocessor Controls (A), or Advanced Microprocessor Controls with Graphics (G). A brief description of each, including operational differ-ences, is listed below. Check model numbers to see what is supplied with your unit.

1.1.1 System Types

Air Cooled ModelsComplete refrigeration system including a hot gas bypass and crankcase heater with standard con-denser and fan speed control for 95°F (35°C) ambient temperature at sea level.

Glycol Cooled ModelsComplete refrigeration system including hot gas bypass, crankcase heater, glycol cooled condenser, two-way fluid regulating valve with bypass, plus pump package and 95°F (35°C) design ambient dry-cooler for installation with closed-loop piping arrangements/systems.

GLYCOOL ModelsComplete refrigeration system including hot gas bypass, crankcase heater, with glycol condenser and three-way fluid regulating valve plus an integrally piped Econ-O-Coil with three-way modulating con-trol valve.

Dual Cool With AirThis system has all the features of an air cooled system but adds a second cooling coil that is con-nected to a source of chilled water. This second coil is controlled by a three-way modulating control valve. It is the primary source of cooling and dehumidification so compressor operation is reduced.

Dual Cool With GlycolThis system has all the features of a glycol cooled system but adds a second cooling coil that is con-nected to a source of chilled water. This second coil is controlled by a three-way, modulating control valve. It is the primary source of cooling and dehumidification so compressor operation is reduced.


2 Installation

2.0 INSTALLATION

2.1 Room PreparationThe room should be well insulated and must have a sealed vapor barrier. The vapor barrier in the ceiling can be a polyethylene film type. Use a rubber or plastic base paint on concrete walls and floors. Doors should not be undercut or have grilles in them.

Outside (or fresh) air should be kept to an absolute minimum. Outside air adds to the heating, cool-ing, humidifying and dehumidifying loads of the site. It is recommended that outside air be kept below 5% of the total air circulated in the room and be pre-conditioned.

2.2 Equipment InspectionUpon arrival of the unit, inspect all items for either visible or concealed damage. Damage should be immediately reported to the carrier and a damage claim filed with a copy sent to Liebert or to your sales representative.

2.3 Equipment Handling

2.3.1 Handling With Skid• Always keep the unit vertically upright, indoors, and protected from possible damage. • If possible transport the unit using a forklift truck; otherwise use a crane with belts or cables,

avoiding pressing on the top edges of the packaging.• If using a forklift truck, make sure the forks (if adjustable) are spread to the widest allowable dis-

tance to still fit under the skid.• When moving the skidded unit with a forklift truck, lift from one narrow end of the unit approxi-

mately 2-4" (50-100 mm) off the ground. Allow the opposite end to remain touching the ground and pull the unit with the forklift truck whenever possible.

! WARNINGThe instructions listed below are to be adhered to when handling this unit with or without the skid. There is the potential for this unit to tip over if handled improperly which will cause damage to the unit and could cause injury or death to the unit handler(s).

! CAUTIONWhile on the skid, the unit is too tall (83-1/4" domestic, 84-3/8" export) to fit through a standard height doorway (83" [2108 mm] tall). Any attempt to move the unit, while skidded, through a standard doorway will cause damage to the unit.


Installation 3

2.3.2 Removal of Skid• Always keep the unit vertically upright, indoors, and protected from possible damage.• Remove the four bolts securing the skid to the base pan of the unit from the underside of the skid.• For skid removal Liebert Corporation recommends using dual hand trucks (see Figure 1) or sim-

ilar operation. This is to ensure that both ends of the unit are firmly secure and to minimize the amount of base pan deflection.

• Once the unit is elevated off the skid, the skid can be removed.

Figure 1 Himod secured to hand trucks

Table 1 Unit net weight

Unit Type Unit Size

Unit Net Weight lbs. (kg)

HMU HMF

Upflow Downflow

Air Cooled

28A 1300 (590) 1278 (580)

34A 1311 (595) 1289 (585)

40A 1322 (600) 1300 (590)

Glycol Cooled

28G 1322 (600) 1300 (590)

34G 1333 (605) 1311 (595)

40G 1344 (610) 1322 (600)

Dual Cool Air Cooled

28D 1762 (800) 1740 (790)

34D 1773 (805) 1751 (795)

40D 1784 (810) 1762 (800)

Dual Cool Glycol Cooled

28H 1762 (800) 1740 (790)

34H 1773 (805) 1751 (795)

40H 1784 (810) 1762 (800)

GLYCOOL

28K 1762 (800) 1740 (790)

34K 1773 (805) 1751 (795)

40K 1784 (810) 1762 (800)


4 Installation

2.4 Location ConsiderationsThe unit can sit on top of an accessible elevated flooring system. It may be necessary to furnish addi-tional pedestal support below the unit to ensure maximum structural support (see Table 1). A sepa-rate floor stand for the unit may be used as support, independent of the elevated floor and installed prior to the flooring system. See Figure 2 through Figure 5 for dimensions of the various units.

Provide approximately 31-1/2" (800 mm) service clearance on the front of the unit.

Avoid locating units in an alcove or at the extreme end of a room that has a high aspect ratio (long narrow room). Ducted units can be located in room corners or ends as long as front access is main-tained. Placing units too close together will reduce the effectiveness of the air distribution.

NOTEAll units must be elevated to make the piping connections. A raised floor, floor stand or base module must be used.

NOTEMotor/blower access is possible only from the top of the unit on upflow models so installation must provide access to these components.


Installation 5

Figure 2 Upflow (HMU) cabinet and floor planning dimensions

65 3/8"

35 3/16"

Shaded area indicates arecommended minimumclearance of 31-1/2" (800mm)be provided for componentaccess.

Field manufactured ductwork must bedesigned to allow access to the fronttop of the unit for fan service.

TOP VIEW

FRONT VIEW

(1660mm)

(646mm)

(894mm)

(1740mm)

(1754mm)

(16mm)

(1954mm)

(40mm)

5/8"

Duct Connection

Duct ConnectionAIR OUTLET OPENING

25 7/16"

1 9/16"

5/8"(16mm)

Hi Volt ConnectionLow Volt Connections Disconnect BezelControl Bezel

3/4" Duct Flange(19mm)

76 15/16"

68 1/2"

88 15/16"(2259mm)

Base Module

69 1/16"


6 Installation

Figure 3 Base module dimensions

Unit is attached to base module by four 3/8" - 16 x 1" bolts

Opening in rear for piping and utility entrance

12" (305mm)

34-27/32"(885mm)

68-1/2"(1740mm)

13-3/16" (335mm)

BASE MODULE


Installation 7

Figure 4 Downflow (HMF) cabinet and floor planning dimensions

65 3/8" Opening

35 3/16"

Shaded area indicates arecommended minimumclearance of 31-1/2" (800mm)be provided for componentaccess.

TOP VIEW

FRONT VIEW

(1660mm)

(894mm)

(1740mm)

(1754mm)

(16mm)

(1954mm)

5/8"

AIR INLET OPENING

Duct Connection

Duct Connection25 7/16" (646mm)

( 40mm )

5/8"(16mm)Control Bezel

Disconnect Bezel

69 1/16"

76 15/16"

1 9/16"

68 1/2"

NOTE:

Downflow electricalconnections can be madefrom top or bottom of unit.

Low Volt Connections High Volt Connection


8 Installation

Figure 5 Downflow (HMF) floor planning dimensions

3-5/8 (93)68-1/2 (1740)

65 (1650) 31-7/8 (810) 1-7/8 (48)

With Floorstand

Without Floorstand

68-7/8 (1750) 34-7/8 (885)

Dimensional Data Inches (mm)A B C D

Height In (mm)E*

Nominal F9 (229) 6-1/2 (165)

12 (305) 9 (229)15 (381) 12 (305)18 (458) 15 (381)21 (533) 18 (458)24 (610) 21 (533)

Dimensional Data In (mm)A B C D

With Floorstand 68-7/8 (1750) 34-7/8 (885) 3-5/8 (93)68-1/2 (1740)

Without Floorstand 65 (1650) 31-7/8 (810) 1-7/8 (48)

Unit is attached tofloorstand by four3/8" - 16 x 1" bolts

FD

E

B

35-1/16"(890mm)

* Leveling feet are provided with 1-1/2" (38mm) adjustment from nominal height

A

C

Optionalturning vane field-installed

RAISED FLOOR CUTOUT


Installation 9

2.5 Piping ConsiderationsAll piping to the unit enters through the bottom of the unit. The piping must be located so that it offers the least resistance to air flow. Careful planning of the piping layout under the raised floor is required to prevent the air flow from being blocked. When installing piping on the subfloor, it is rec-ommended that the pipes be mounted in a horizontal plane rather than stacked one above the other. Whenever possible, the pipes should be run parallel to the air flow. See Figure 6 through Figure 15 for piping connection details.

Condensate pumps for downflow units are shipped separately to be field-installed under the raised floor or in the base module. A minimum of 12" (305 mm) is required as clearance to install the conden-sate pump.

2.5.1 Drain LineA 3/4" (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate drain This drain line also drains the humidifier, if applicable. The drain line must be located so it will not be exposed to freezing temperatures. The drain should be at least the full size of the drain connec-tion and pitched a minimum of 1/8" per ft. (3.2 mm per 305 mm).

NOTEThis line may contain boiling water. Select appropriate drain system materials.

NOTEAll units contain a factory-installed condensate trap. Do NOT add an external trap.


10 Installation

Figure 6 Piping connections for air cooled units—upflow models (HMU)

Hot Gas Liquid

7/8 CU 5/8 CU

PIPING CONNECTIONS INCHES

1/4 CU

3/4 FPT*DRAIN CONNECTION

REFRIGERANT

HUMIDIFIER

Piping exits bottom of unit and must be routedthrough base module (shown) or floorstand

FRONT VIEW

BOTTOM VIEW

Drain Connection *

Front of Unit

Liquid Line

Humidifier Supply Line

Hot Gas Line

(535mm)

(291mm)

(545mm)(635mm)

(76mm)(76mm)

21 7/16"25"

11 7/16"

21 1/16"

3"3"

* Field pitch the drain line a minimum of 1/8" per foot (3.2 mm per 305 mm). All units contain a factory-installed condensate trap. Do not add an external trap. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply with all local codes.


Installation 11

Figure 7 Piping connections for air cooled units—downflow models (HMF)

HOT GAS LIQUID

7/8 CU 5/8 CU

DRAIN CONNECTION

1/4 CU

3/4 FPT*


REFRIGERANT

HUMIDIFIER

FRONT VIEW

BOTTOM VIEW

AIR OUTLET OPENING

Drain Connection *2 3/16"

10 13/16"

5 15/16"

13 9/16"

(275mm)

(56mm) (151mm)

(344mm)8"

(203mm)

5" (127mm)

Liquid Line

Hot Gas Line

Front of Unit




12 Installation

Figure 8 Piping connections for air dual cool units with Econ-O-Coil—upflow models (HMU)

(76mm)

FACTORYPIPING

FIELDPIPING

*Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance.

Econ-O-Coil

3-Way ChilledEcon-O-Coil

Valve

Valve Actuator

Econ-O-CycleComparator

Isolation Valves

Fluid Returnfrom

Econ-O-Coil

Fluid Supplyto

Econ-O-Coil

HoseBibs

*

*

HOT GAS LIQUID

7/8 CU 5/8 CU

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

DRAIN CONNECTION

1/4 CU

3/4 FPT **


REFRIGERANT

ECON-O-COIL

HUMIDIFIER

BOTTOM VIEW

Drain Connection

Hot Gas Line


Econ-O-Coil Return Line

Front of Unit

Liquid Line

Econ-O-Coil Supply Line

(467mm)

(49mm)

(249mm)

(291mm)

(535mm)

(545mm)(635mm)

1 15/16"

9 13/16"

11 7/16"

21 1/16"

18 3/8"

24 1/2"(622mm)

21 7/16"25"

* *


3"

3" (76mm)

FRONT VIEW

** Field pitch the drain line a minimum of 1/8" per foot (3.2 mm per 305 mm). All units contain a factory-installed conden-sate trap. Do not add anexternal trap. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply with all local codes.


Installation 13

Figure 9 Piping connections for air dual cool units with Econ-O-Coil—downflow models (HMF)

*

BOTTOM VIEW

AIR OUTLET OPENING

Drain Connection * *2 3/16"

10 13/16"

5 15/16"

13 9/16"

(275mm)

(56mm) (151mm)

(344mm)

8" (203mm)

5"(127mm)

Liquid Line

Hot Gas Line

Front of Unit

Econ-O-Coil

3-Way ChilledEcon-O-CoilValve

Valve Actuator


HoseBibs

Isolation Valves

Fluid ReturnfromEcon-O-Coil

Fluid SupplytoEcon-O-Coil

FRONT VIEW

HOT GAS LIQUID

7/8 CU 5/8 CU

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

DRAIN CONNECTION

1/4 CU

3/4 FPT* *


REFRIGERANT

HUMIDIFIER

ECON-O-COIL



7 7/8"15 3/4"

(200mm)(400mm)

1 15/16"

9 13/16"

(49mm)(249mm)


*

FACTORYPIPING

FIELDPIPING


* *Field pitch the drain line a minimum of1/8" per foot (3.2 mm per 305 mm). All units contain a factory-installed condensate trap. Do not add an external trap. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply with all local codes.


14 Installation

Figure 10 Piping connections for glycol cooled units—upflow models (HMU)

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

DRAIN CONNECTION 3/4 FPT *


GLYCOL CONDENSER

HUMIDIFIER 1/4 CU

Piping exits bottom of unit and must be routed throughbase module (shown) or floorstand.

FRONT VIEW

BOTTOM VIEW

Drain Connection*

Front of Unit

Glycol Return LineGlycol Supply Line


(76mm)

(76mm)

(635mm)

(545mm)

(291mm)

(535mm)

25"

21 7/16"

11 7/16"

21 1/16"

3"

3"



Installation 15

Figure 11 Piping connections for glycol cooled units—downflow models (HMF)

SUPPLY RETURN

1-3/8 CU 1-3/8 CU


GLYCOL CONDENSER

HUMIDIFIER

DRAIN CONNECTION 3/4 FPT *

1/4 CU

FRONT VIEW

BOTTOM VIEW

AIR OUTLET OPENING

Drain Connection *2 3/16"

10 13/16"

5 15/16"

13 9/16"

Glycol Supply Line 8"

5"

Front of Unit

(344mm)

(151mm)

(56mm)

(275mm)

(203mm)

(127mm)

Glycol Return Line




16 Installation

Figure 12 Piping connections for GLYCOOL cooled units—upflow models (HMU)

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

DRAIN CONNECTION

1/4 CU

3/4 FPT *


GLYCOL CONDENSER

HUMIDIFIER

FRONT VIEW


(545mm)(635mm)

21 7/16"25"

18 3/8"24 1/2"(467mm)(622mm)

1 15/16"

9 13/16"

11 7/16"

21 1/16"

(49mm)

(249mm)

(291mm)

(535mm)

Glycol Supply Line

Glycol Return Line


Drain Connection *

BOTTOM VIEW

Front of Unit



Installation 17

Figure 13 Piping connections for GLYCOOL cooled units—downflow models (HMF)

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

DRAIN CONNECTION

1/4 CU

3/4 FPT *


GLYCOL CONDENSER

HUMIDIFIER

FRONT VIEW

AIR OUTLET OPENING

2 3/16"8"

Front of Unit

Glycol Supply Line

Glycol Return Line


Drain Connection *

5"

(203mm)

(127mm)(56mm)

10 13/16"

(275mm)

BOTTOM VIEW

5 5/16"

13 9/16"(344mm)

(151mm)



18 Installation

Figure 14 Piping connections for glycol dual cool units—upflow models (HMU)

*

Econ-O-Coil

3-Way ChilledEcon-O-Coil

Valve

Valve Actuator

Econ-O-CoilComparator

Fluid Returnfrom

Econ-O-CoilFluid Supply

toEcon-O-Coil

HoseBibs

BOTTOM VIEW

Drain Connection

Glycol Condenser Return Line

Glycol Condenser Supply Line




Front of Unit

(535mm)

(291mm)

(249mm)

(49mm)

(467mm)

(545mm)

(635mm)

18 3/8"

24 1/2"(622mm)

1 15/16"

9 13/16"

11 7/16"

21 1/16"

21 7/16"25"

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

1-3/8 CU 1-3/8 CU

HUMIDIFIER

DRAIN CONNECTION

1/4 CU

3/4 FPT *


GLYCOL CONDENSER

ECON-O-COIL

FACTORYPIPINGFIELDPIPING


***

3"

3"

(76mm)

(76mm)

Piping exits bottom of unit and must be routed throughbase module (shown) or floorstand

* Field pitch the drain line a minimum of1/8" per foot (3.2 mm per 305 mm). All units contain a factory-installed condensate trap. Do not add an external trap. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply with all local codes.

FRONT VIEW

** Isolation Valves


Installation 19

Figure 15 Piping connections for glycol dual cool units—downflow models (HMF)

BOTTOM VIEW

AIR OUTLET OPENING

2 3/16"

10 13/16"

5 15/16"

13 9/16"


Glycol Condenser Supply Line

8"

5"

Front of Unit

Glycol Condenser Return Line

7 7/8"

15 3/4"

1 15/16"

9 13/16"

Drain Connection *

Econ-O-Coil

Valve Actuator

3-Way ChilledEcon-O-CoilValve

Fluid ReturnfromEcon-O-Coil

Fluid SupplytoEcon-O-Coil

Econo-O-CoilComparator

HoseBibs

IsolationValves


**Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance.


(249mm)

(49mm)

(203mm)

(127mm)(200mm)

(400mm)

(344mm)

(151mm)

(56mm)

(275mm)

**

**

SUPPLY RETURN

1-3/8 CU 1-3/8 CU

1-3/8 CU 1-3/8 CU


GLYCOL CONDENSER

ECON-O-COIL

HUMIDIFIER 1/4 CU

3/4 FPT *DRAIN CONNECTION

FRONT VIEW


* Field pitch the drain line a minimum of1/8" per foot (3.2 mm per 305 mm). All units contain a factory-installed condensate trap. Do not add an external trap. Drain line may contain boiling water. Select appropriate drain system materials. The drain line must comply with all local codes.


20 Installation

2.6 Electrical ConnectionsThree-phase electrical service is required for all models in either 208, 230, or 460 Volts, 60 Hertz. Electrical service shall conform to national and local electrical codes. Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to electrical schematic when making connections.

A manual electrical disconnect switch should be installed within 5 feet (1.6 m) of the unit in accor-dance with codes, a factory-supplied disconnect switch is factory-mounted within the unit accessible from the exterior.

! WARNINGUse voltmeter to make sure power is turned off before making any electrical connections.

! CAUTIONThree-phase power must be connected to the unit line voltage terminals in proper sequence so that scroll compressor rotates in the proper direction.


Installation 21

Figure 16 Electrical field connections

1. Electric conduit knockouts on top of electric box (upflow) and on bottom of electric box (downflow). Knockout sizes for high voltage: 1-3/8" (35 mm), 1-3/4" (44.5 mm), 2-1/2" (64 mm); low-voltage: 7/8" (22 mm), 1-1/8" (29 mm), 1-3/8" (35 mm).

2. Three-phase electric service connection terminals are on top of disconnect switch. Three-phase service not by Liebert.

3. Factory-installed disconnect switch4. Earth ground connection. Connection terminal for field-supplied earth grounding wire.5. Autotransformer is factory-installed and wired for blower motors speed control.6. Control and monitoring section of electric box.7. Remote unit shutdown. Replace existing jumper between terminals 37 & 38 with normally

closed switch having a minimum 75VA, 24VAC rating. Use field-supplied Class 1 wiring. Two additional contact pairs available as an option (labeled as 37B & 38B, 37C & 38C). Replace existing jumper for appropriate pair as done for 37 & 38.

8. Special alarm connections. Field-supplied 24V. Class 1 wiring for special alarm. Connection made by adding normally open contacts between terminals 24 & 50. Optional additional connections available with optional accessories (connections 51, 55, and 56).

9. SiteScan connection. Terminals 77 (-) and 78 (+) are for connection of a 2 wire, twisted pair, communication cable (available from Liebert or others) to optional SiteScan.

10. Smoke detector alarm connections. Field-supplied 24V. Class 1 wiring to remote alarm circuits. Factory-wired contacts from optional smoke detector are #91-comm., #92-NO, and #93-NC.

11. Common alarm connection. Field-supplied 24V. Class 1 wiring to common alarm terminals 75 & 76 (and optional 94 & 95, and 96 & 97), which are factory-connected to common alarm relay (R3).

12. Heat rejection connection. Field-supplied 24V Class 1 wiring to interlock heat rejection from pigtails 70 & 71 which are factory-connected to compressor side switch (or to relay [R5], GLYCOOL and Dual Cool units only).

13. Reheat and Humidifier Lockout. Optional emergency power lockout of reheat and/or humidifier: connections provided for remote 24V AC source.

14. Main Fan Auxiliary Switch. Optional main fan auxiliary side switch. Terminals located in field wiring compartment for remote indication that the evaporator fan motor/unit is on. Field to connect 24V maximum.

15. Optional Condensate Alarm (condensate pump option). Relay terminals located in field wiring compartment for remote indication.

16. Analog inputs. Optional terminals for shielded, twisted-pair cables from up to as many as four customer-supplied analog sensors.

NOTE: Refer to specification sheet for full load amp and wire size amp ratings.

37C38C37B38B 37 38 75 76 94 95 9624 50 51 55 56 84 85 91 92 9382 83 88

8 14 1013 7 11

Terminal Block (forcustomer connections)

41 42 43 44 45 46 47 48

16

89 97 77 78

15 9

70 7112Electrical Handy Box(factory installed w/cover)

2 4

3

6

A

B C

D12

A B C D

5

1

11


22 Installation

2.7 Balancing Air Distribution2.7.1 Under-Floor Discharge Systems

The systems are designed for constant air delivery, therefore any unusual restrictions within the air circuit must be avoided. For under-floor air distribution, observe the following guidelines: Select the air supply grilles and perforated panels for the raised floor to ensure minimum loss of pres-sure in the circuit. Air volume dampers on grilles, which extend several inches below the surface of the raised floor, are usually detrimental to airflow. Consideration of the height of the damper on the grille in conjunction with the floor height will deter-mine whether this type of grille may be used. The grilles used in raised floors vary in size; the largest is approximately 18" x 6" (457 x 152 mm). A larger grille size would be detrimental to the structural capacity of the raised floor panel. An 18" x 6" (457 x 152 mm) heavy duty, pencil-proof type grille typically has 56 square inches (0.036 m2) of free area. Perforated panels are available from various manufacturers of raised floors. These panels are usually 2' x 2' (610 x 610 mm) square and have a nominal free area of approximately 108 to 144 square inches (0.07 to 0.09 m2). Use caution in selecting perforated panels as some manufacturers have only 36 to 40 square inches (0.023 to 0.026 m2)of free area, requiring four times as many panels. Avoid floor elevations below 7-1/2" (190.5 mm), loosely installed flooring systems, and below-floor obstructions such as electrical wiring chases, unusually long electronic system cables, or piping clus-ters. Always check specifications of the floor supplier before specifying the total number of perforated pan-els and grilles required to handle the air flow. The proper specifications for grilles and perforated pan-els should indicate the total free area required for air delivery rather than the number of panels and grilles. (See Table 2 for recommended free area required for each model.) This table indicates the rec-ommended free area based on having the supply air grilles and perforated panels sized to handle approximately 75% of the total cubic feet per minute (CFM) of the units at a velocity of 550 to 600 ft./min. (2.8 - 3.1 m/s). The remaining 25% of the air flow in the raised floor passes through cable cutouts, cracks between the panels, and other leakage areas.

2.7.2 Ducted ApplicationsFor ducted applications on units, the duct work may be attached to the top perimeter of the unit. Refer to Figure 2 for information on upflow units and to Figure 4 for downflow units.The duct work on upflow units must allow access to the motors/blowers for maintenance. The duct work on upflow units must be designed within the capacity of the unit, otherwise air flow and perfor-mance will be compromised.

2.7.3 Plenum InstallationA solid plenum or plenum with front discharge grille may be installed. The plenum and instructions for its installation ship separately from the unit.

Table 2 Recommended free area ft2 (m2) for grilles or perforated panels at output velocities of 550 and 600 FPM (2.8 and 3.1 m/s)

60 Hz Units Model 550 FPM 2.8 m/s 600 FPM 3.1 m/s

HMF 28 A/G 8.0 (0.04) 7.3 (0.04)HMU 28 A/G 7.9 (0.04) 7.2 (0.04)HMF 28 K/D/H 8.0 (0.04) 7.3 (0.04)HMU 28 K/D/H 7.9 (0.04) 7.3 (0.04)HMF 34 A/G 8.9 (0.05) 8.1 (0.04)HMU 34 A/G 8.7 (0.04) 7.9 (0.04)HMF 34 K/D/H 8.8 (0.04) 8.1 (0.04)HMU 34 K/D/H 8.4 (0.04) 7.7 (0.04)HMF 40 A/G 10.0 (0.05) 9.2 (0.05)HMU 40 A/G 10.0 (0.05) 9.2 (0.05)HMF 40 K/D/H 9.2 (0.05) 8.4 (0.04)HMU 40 K/D/H 9.1 (0.05) 8.4 (0.04)


Air Cooled Models 23

3.0 AIR COOLED MODELS

3.1 Condenser LocationThe air cooled condenser should be located for maximum security and maintenance accessibility. Avoid ground level sites with public access or areas which contribute to heavy snow or ice accumula-tions. Utilize centrifugal condensers whenever interior building locations must by used. To assure adequate air supply, it is recommended that condensers be located in a clean air area, away from loose dirt and foreign matter that may clog the coil. In addition, condensers should not be located in the vicinity of steam, hot air, or fume exhausts. Also, condensers should be located no closer than 3 feet (1 meter) from a wall, obstruction, or adjacent unit.

Install condensers in a level position to assure proper refrigerant flow and oil return. For roof instal-lation, mount condensers on steel supports in accordance with local codes. To minimize sound and vibration transmission, mount steel supports across load bearing walls. For ground installation, a concrete pad will provide adequate support. Condenser legs have mounting holes for securing the con-denser to the steel supports or concrete pad.

3.2 Electrical ConnectionsRefer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec-trical schematic when making connections. Make all wiring and electrical connection in accordance with local and national codes.

3.2.1 Line VoltageLine voltage electrical service is required for all air cooled condensers at the location of the condenser. This power supply does not have to be the same voltage as the indoor unit. This separate power source may be 208, 230, 460, or 575 Volts, 60 Hertz. The disconnect switch may be factory supplied and mounted in the electrical panel or field-supplied and mounted per local and national codes.

3.2.2 Low VoltageA control interlock between the condenser and the indoor unit is required and is connected between 70 and 71 in the handy box of the indoor unit and the electric panel of the air cooled condenser. NEC Class 1 wiring is required.

3.2.3 Lee-Temp/Flood Back Head Pressure Control CondensersLee-Temp condensers require a separate power supply for the heated receivers. This power supply is connected to the electrical connection box on the end of the receiver.

! WARNINGUse a voltmeter to make sure power is turned off before making any electrical connections.

Table 3 Recommended line sizes — OD copper (inches)*

Equivalent Length

HM_28 A/D HM_34 A/D HM_40 A/D

Hot Gas Line Liquid Line



50 ft. (15 m) 1-1/8 5/8 1-1/8 7/8 1-1/8 7/8

100 ft. (30 m) 1-1/8 7/8 1-1/8 7/8 1-1/8 7/8

150 ft. (45 m) 1-1/8 7/8 1-1/8 7/8 1-3/8 7/8*Recommended vertical line sizes must be used for proper oil return at all cooling and dehumidification steps.


24 Air Cooled Models

Figure 17 Air cooled condensers

Table 4 Air cooled condenser statistics

Model Numberof Fans

Connection Sizes(OD Copper)

NetWeight

A Dimension

B Dimension

Hot Gas (in.)

Liquid (in.) lbs (kg) in. (mm) in. (mm)

165L 2 7/8 5/8 425 (193) 91-7/16 (2324) 84 (2134)

205L 2 1-1/8 5/8 495 (225) 91-7/16 (2324) 84 (2134)

217C 2 7/8 5/8 515 (234) 91-7/16 (2324) 84 (2134)

251L 3 7/8 5/8 500 (227) 131-7/16 (3340) 124 (3150)

308L 3 1-1/8 5/8 670 (305) 131-7/16 (3340) 124 (3150)

42" (1067mm)

Lee-Temp dimension includes heater pad connection box.

B

A

Lee-Temp Receiver(when specified)

Electrical service supplied by others

Inverted traps areto be field-supplied and installed (Typ.). When installing traps, provideclearance for swing of end access door. Traps are to extend above base of coil by a minimum of7-1/2" (190mm).

NOTE: When system uses Lee-Temp, liquid line does not need an inverted trap.

43-3/16"(1097mm)

37-7/8"(1095mm)

43-9/16"(1105mm)

Secure each leg to condenser atpoints shown using hardware provided.



3.3 Refrigerant PipingAll refrigeration piping should be installed with high temperature brazed joints. Prevailing good refrigeration practices should be employed for piping supports, leak testing, dehydration and charg-ing of the refrigeration circuits.

All cooled units are shipped from the factory with a nitrogen holding charge.

Traps should be installed in the hot gas line on vertical risers at the base and every 25 feet (7.6 meters) in elevation. These traps will collect condensed refrigerant and refrigerant oil during the off cycle of the unit and ensure flow of refrigerant oil during operation.

Factory approval is required whenever a refrigerant piping run exceeds 150 feet (46 meters) equiva-lent length or when condensers must be located more than 15 feet (4.6 meters) below the level of the cooling coil.

Total discharge line pressure drop must not exceed 10 PSIG (69 kPa).

Consult your local Liebert representative when considering installations outside these guidelines.

3.4 Fan Speed Control SystemsFan Speed Control provides an infinite number of speed variations on specially designed, permanent split-capacitor motors. The control module varies the air quantity passing over the condenser coil by monitoring refrigerant pressure.

3.4.1 Materials Supplied1. Built-in pre-wired condenser control box2. Air cooled condenser3. Piping access cover to be reinstalled when piping is complete4. Bolts (four per leg) 3/8" x 5/8" 5. Terminal block for two-wire, 24-volt interlock connection between unit and condenser6. Condenser legs, four on two-fan models

NOTEThe refrigeration piping should be isolated from the building by the use of vibration isolating supports.

NOTEPiping, including inverted trap(s), must be routed to allow unobstructed access to the panel per the NEC.



3.4.2 Dehydration/Leak Test and Charging Procedures for R407C or R22

Fan Speed Control Type Condenser

Dehydration/Leak Test1. Make sure unit is OFF. Open all disconnects and remove all fuses except control fuses. On units

supplied with circuit breakers, open all breakers except for the transformer.2. Add a jumper to the Fan Safety Switch between Common and Normal Open and disconnect the

wire connected to the Normally Closed. Turn unit disconnect ON. (Fan operation not required.)

3. Connect refrigeration gauges to the suction and discharge service valves of the compressor. Open all compressor service valves.

4. To energize the liquid line solenoid valves through the control system power, set the control temperature setpoint (see operation manual) to 60oF (15oC) and set the % relative humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are open during the dehydration process.

5. Pressurize the system circuit(s) to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of refrigerant. Check system for leaks with suitable leak finder.

6. After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum on the system with a suitable pump.

7. After four hours, check the pressure readings, and if they have not changed, break vacuum with refrigerant. Pull another vacuum to 250 microns or less. Recheck the pressure after two hours. After completing this step, pressurize the circuits with refrigerant (R407C liquid or R22 vapor per unit nameplate) until suction and discharge pressures have equalized.

! CAUTIONAll local codes for handling refrigerant must be followed

NOTEAs R22 and R407C are similar in properties, proper safety equipment and proper refrigeration tools are required on both types. Check unit nameplate for correct refrigerant type before topping off or recharging a system.

NOTERefrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be introduced and charged from the cylinder only as a liquid.

NOTEThe above allows the technician to use unit 24 VAC power and controls to open liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) for the dehydration process. If no power is at the unit disconnect, the technician is to use a separate 24 VAC source rated at 75 VA and connect to the system liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) directly.



Figure 18 Air cooled fan speed control general arrangement

CondenserCoil

SchraderValve

FusiblePlug

Inverted Traps* on dischargeand return lines to extendabove base of coil by aminimum of 7 1/2" (190mm)

Traps* every25 ft. (7.6m)of rise

EvaporatorCoil

ExpansionValve

Hot GasBy-PassValve

SolenoidValve

SightGlass

FilterDrier

Liquid Return

SensingBulb

ExternalEqualizers

ScrollCompressor

Hot GasBy-Pass

Hot GasDischarge

Check Valve

FACTORYPIPING

FIELDPIPING


AccessValve

Low PressureSwitch Connection

Shut-OffValve

High PressureSwitchConnection

Service Valves

Service Valves

Liquid-Gas Mixer



Table 5 Indoor unit refrigerant charge lbs (kg)

Model RefrigerantChargelbs. (kg)

28A1 R407C 4.4 (2.0)

28D1 R407C 4.4 (2.0)

28A0 R22 4.4 (2.0)

28D0 R22 4.4 (2.0)

34A1 R407C 6.0 (2.7)

34D1 R407C 6.0 (2.7)

34A0 R22 6.0 (2.7)

34D0 R22 6.0 (2.7)

40A1 R407C 7.7 (3.5)

40D1 R407C 7.7 (3.5)

40A0 R22 7.7 (3.5)

40D0 R22 7.7 (3.5)

Table 6 Line charges—refrigerant per 100 ft. (30 m) of Type “L” copper tube

O.D.

Liquid Line

lb kg

5/8" 11.7 5.3

7/8" 24.4 11.1

1-1/8" 41.6 18.6

1-3/8" 63.3 28.7

Table 7 Condenser refrigerant charge lbs. (kg)

Model

Approximate Refrigerant Charge

Fan Speed ControlLee-Temp

(Includes Receiver)

165L 15 (7) 53 (24)

205L 20 (9) 76 (35)

217C 27 (12) 102 (46)

251L 19 (9) 75 (34)

308L 29 (13) 113 (51)

Total Charge per Circuit = Unit Charge + Condenser Charge + Liquid Line Charge



3.4.3 Charging1. Make sure unit is OFF. Open all disconnect switches and, on units supplied with circuit breakers,

open all breakers. Replace all fuses for the Fan and Compressors or close breakers.2. Remove jumper on the Fan Safety Switch and reconnect the system wire connections. Ensure that

all operational components are clear of debris. Turn unit ON. (Fan operation is required.) Check the evaporator fan for proper rotation and correct if necessary.

3. Connect the refrigerant gauge charging hose to the drum of refrigerant and to the suction and discharge service valves of the compressor.

4. Calculate the amount of charge for the system. Weigh in as much of the system charge as possible. Refer to the unit, condenser and refrigerant line charge tables.

5. Set the control temperature setpoint (see operation manual) to 60oF (15oC) and set the % relative humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are open during the charging procedure. You may have to bypass the LP Switch to start the compressors and stop short cycling. Reset the Head Pressure switch(es) if open.

6. Add refrigerant (R407C liquid, or R22 vapor per unit nameplate) to the suction side of the compressor until there is sufficient pressure to energize the low-pressure switch.

Then you may remove the manual bypass you applied earlier.7. Charge the unit until the liquid line sight glass becomes clear. Then add one additional pound of

refrigerant.8. As head pressure builds, the condenser fan will start rotating. The fan will become fully energized

when sufficient head pressure is developed. (Fan starts to rotate at 190 psi and is full speed at 250 psi.)

NOTEWhen adding refrigerant to an operating system, it may be necessary to add the refrigerant through the compressor suction service valve. Because the refrigerant leaving the refrigerant cylinder must be in a liquid state, care must be exercised to avoid damage to the compressor. It is suggested that a sight glass be connected between the charging hose and the compressor suction service valve. This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

Table 8 Refrigerant control settings psi (kPa)Low Pressure

Cut Out Low Pressure

Cut In High Pressure

Cut Out

20 (137.9) 65 (448.2) 360 (2482)



3.5 Lee-Temp/Flood Back Head Pressure Control SystemsThe Lee-Temp system consists of a modulating type head pressure control valve and insulated receiver with heater pad to ensure operation at ambient temperatures as low as -30°F (-34.4°C).

3.5.1 PipingLee-Temp systems have factory-supplied, field-installed check valve; it is on the inlet side of the receiver. Be sure to install the check valve with the refrigerant flow in the proper direction. When sol-dering or brazing the valve, it is very important that the internal parts be protected by wrapping the valve with a damp cloth to keep the valve temperature below 250°F (121°C).

3.5.2 Materials Supplied1. Built-in pre-wired condenser control box2. Air cooled condenser 3. Piping access cover to be reinstalled when piping is complete4. Bolts (4 per leg) 3/8" x 5/8" 5. Terminal block for 2-wire 24-volt interlock connection between the unit and the condenser 6. Condenser legs: 6 on 2 fan models 7. Lee-Temp system:

a. Insulated storage receiver b. Head pressure control valve with integral check valve c. Adapter assembly d. Rotalock valve e. Pressure relief valve f. Liquid level sight glass g. Check valve

8. Bolts - (6 per receiver) 3/8" x 1"

3.5.3 Dehydration/Leak Test and Charging Procedures for R407C or R22

Lee-Temp Control Type Condenser

NOTELee-Temp heater pad requires a separate, continuous electrical source of either 115 VAC or 200/208/230 VAC.

! CAUTIONAll local codes for handling refrigerant must be followed.

NOTEAs R22 and R407C are similar in properties, proper safety equipment and proper refrigeration tools are required on both types. Check unit nameplate for correct refrigerant type before topping off or recharging a system.

NOTERefrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be introduced and charged from the cylinder only as a liquid.



Dehydration/Leak Test1. Make sure unit is OFF. Open all disconnect switches and pull all fuses except control fuses. On

units supplied with circuit breakers, open all breakers except for the transformer.2. Add a jumper to the Fan Safety Switch between Common and Normal Open and disconnect the

wire connected to the Normally Closed. Turn unit disconnect ON. (Fan operation not required.)

3. Connect refrigeration gauges to the suction and discharge service valves of the compressor and open.4. Attach a “jumper” hose from the Rotalock fitting on the outlet of the receiver and the Schrader fitting

on the liquid header of the condenser. Front seat the Rotalock valve approximately 2 turns.5. To energize the liquid line solenoid valve(s) through the control system, set the temperature

setpoint (see operation manual) to 60oF (15oC) and set the % relative humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are open during the dehydration process.

6. Pressurize system circuit(s) to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of refrigerant. Check system for leaks with suitable leak finder.

7. After completion of leak testing, release test pressure (per local code) and pull a vacuum on the system.

8. After 4 hours, check pressure readings and, if they have not changed, break vacuum with refrigerant. Pull a second and third vacuum of 250 microns or less. Recheck pressure after 2 hours.

3.5.4 Charging1. Make sure unit is OFF. Open all disconnect switches and, on units supplied with circuit breakers,

open all breakers. Replace all fuses for the Fan and Compressors or close breakers.2. Remove jumper on the Fan Safety Switch and reconnect the system wire connections. Ensure that

all operational components are clear of debris. Turn unit ON. (Fan operation is required.) Check the evaporator fan for proper rotation and correct if necessary.

3. Connect the refrigerant gauge charging hose to the drum of refrigerant and to the suction and discharge service valves of the compressor(s).

4. Calculate the amount of charge for the system. Weigh in as much of the system charge as possible. Refer to the unit, condenser and refrigerant line charge tables.

5. Set the control temperature setpoint (see operation manual) to 60oF (15oC) and set the % relative humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are open during the charging procedure. You may have to bypass the LP Switch to start the compressors and stop short cycling. Reset the Head Pressure switch(es) if open.

6. Add refrigerant (R407C liquid or R22 vapor per unit nameplate) to the suction side of the compressor until there is sufficient pressure to energize the low pressure switch.

Then you may remove the manual bypass you applied earlier.7. Charge the unit until the proper charge is weighed in.

NOTEThe above allows the technician to use unit 24 VAC power and controls to open liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) for the dehydration process. If No power is at the unit disconnect, the technician is to use a separate 24 VAC source rated at 75 VA and connect to the system liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) directly.

NOTEWhen adding refrigerant to an operating system, it may be necessary to add the refrigerant through the compressor suction service valve. Because the refrigerant leaving the refrigerant cylinder must be in a liquid state, care must be exercised to avoid damage to the compressor. It is suggested that a sight glass be connected between the charging hose and the compressor suction service valve. This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

Table 9 Refrigerant control settings psi (kPa)Low Pressure Cut Out Low Pressure Cut In High Pressure Cut Out

20 (137.9) 65 (448.2) 360 (2482)



Figure 19 Air cooled Lee-temp general arrangement

Hot gasdischarge

FACTORY PIPING

FIELD PIPING

* Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance

Scroll compressor

Service valves

Low-pressure switch connection

External equalizers

Check valve

High-pressure switchconnectionHot gas

bypass

Filter d

ryer

Shutoff valve

Sight glass

Hot gas bypass valve

Solenoid valves

Sensing bulb

Evaporator coil

Liquid-gas mixer

Access valve

Expansion valve

Liquid return

Traps* every 25 ft (7.6m) of rise on hot gas line

Liquid return from condenser

Sight glass

Pressure relief valve

Roto Lock valve

Lee-Temp receiver

Head pressure

control w

ith integral

check valve

Check valve

Condenser coilInverted trap* ondischarge line to extend above base of coil by a minimum of 7-1/2" (190mm)


Glycol/GLYCOOL Cooled Models 33

4.0 GLYCOL/GLYCOOL COOLED MODELS

4.1 Drycooler LocationThe drycooler should be located for maximum security and maintenance accessibility. Avoid ground-level sites with public access or areas which contribute to heavy snow or ice accumulations. To assure adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose dirt and foreign matter that may clog the coil. In addition, drycoolers should not be located in the vicinity of steam, hot air or fume exhausts. Also, drycoolers should not be located closer than 3 feet (1 meter) from a wall, obstruction or adjacent unit.

4.2 Drycooler InstallationFor roof installation, mount drycoolers on steel supports in accordance with local codes. To minimize sound and vibration transmission, mount steel supports across load bearing walls. For ground instal-lation, a concrete pad will provide adequate support. Drycooler legs have mounting holes for securing the drycooler to steel supports or concrete pad.

4.3 Electrical ConnectionsRefer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec-trical schematic when making connections. Make all wiring and electrical connections in accordance with local and national codes.

4.3.1 Line VoltageLine voltage electrical service is required for all drycoolers at the location of the drycooler. This power supply does not have to be the same voltage as the indoor unit. This separate power source may be 208, 230, 460, or 575 Volts 60 Hertz. The disconnect switch is factory-supplied and mounted in the electric panel.

4.3.2 Low VoltageA control interlock between the drycooler and the indoor unit is required and is connected between 70 and 71 in the handy box of the indoor unit and the pump and drycooler control box of the drycooler. NEC Class 1 wiring is required.

4.3.3 Pump and DrycoolerAll wiring to the pump and drycooler from the control box should be done in accordance with the elec-trical schematic on the inside lid of the drycooler control box and with local and national codes.

! WARNINGUse a voltmeter to make sure power is turned off before making any electrical connections.


34 Glycol/GLYCOOL Cooled Models

4.4 Glycol Piping

It is recommended that manual service shut-off valves be installed at the supply and return connec-tions to each unit. This enables routine service and/or emergency isolation of the unit. In addition, multiple pump packages require a check valve at the discharge of each pump to prevent back flow through the standby pump(s).

To facilitate filling, installation of hose bibs at the lowest point of the system is recommended.

Consideration of the minimum glycol temperature to be supplied from the drycooler will determine if the need exists to insulate the glycol supply and return lines. Insulation will prevent condensation on the glycol lines in low ambient conditions.

All fluid piping must comply with local codes. Care in sizing pipes will help reduce pumping power and operating costs.

! CAUTIONGalvanized pipe must not be used in or with systems or units that contain glycol. The phosphates in the inhibitor can react with the zinc in the galvanized pipe, precipitating an insoluble material that can eventually foul the system.

! CAUTIONTo help prevent piping failures, supply and return lines must be supported in a way that keeps their weight from bearing on the piping of the unit, drycooler or pumps.

! CAUTIONTo avoid the possibility of burst pipes, it is necessary to install a relief valve in the system. This valve may be obtained from the supplier as an option or obtained from another vendor.

! CAUTIONFluid cooled condensers have small internal flow passages. To avoid clogging and other resulting system operation problems, install a 16-20 mesh filter in the fluid supply line to the indoor unit. The filter should be located where it can be easily serviced or replaced.

! CAUTIONDo not install unit on open loop systems. Debris carried by the fluid will clog the brazed plate condenser.

Table 10 Room dew point temperatures Dry Bulb°F (°C)

Wet Bulb°F (°C)

Relative Humidity

Dew Point*°F (°C)

70 (21.1)70 (21.1)

57.2 (14.0)58.5 (14.7)

4550

48.0 (8.9)50.5 (10.3)

72 (22.2)72 (22.2)

58.9 (24.9)60.0 (15.5)

4550

50.0 (10.0)52.4 (11.3)

75 (23.8)75 (23.8)

61.2 (16.2)62.5 (16.9)

4550

52.4 (11.3)55.0 (12.7)

* Minimum glycol temperature before condensation will occur.



4.4.1 Expansion Tanks, Fluid Relief Valves and Other DevicesAn expansion tank must be provided for expansion and contraction of the fluid due to temperature change in this closed system. Vents are required at system high points to vent trapped air when fill-ing the system. A relief valve is a also a necessary piping component.

Depending on the complexity of the system, various other devices may be specified. Pressure gauges, flow switches, automatic air separator, tempering valves, standby pumps, sensors for electrical con-trols, and flow switches are just a few of these devices.

4.5 Filling Instructions4.5.1 Preparing the System for Filling

It is important to remove any dirt, oil or metal filings that may contaminate the cooling system piping in order to prevent contamination of the fresh glycol solution and fouling of the drycooler piping. The system should be flushed thoroughly using a mild cleaning solution or high-quality water and then completely drained before charging with glycol. Cleaning new systems is just as important as clean-ing old ones. New systems can be coated with oil or a protective film; dirt and scale are also common. Any residual contaminants could adversely affect the heat transfer stability and performance of your system. In many cases, in both old and new systems, special cleaners are needed to remove scale, rust and hydrocarbon foulants from pipes, manifolds and passages. Clean heat transfer surfaces are important in maintaining the integrity of the heating/cooling system. For more information on clean-ers and degreasers, contact your sales representative. Follow the manufacturer's instructions when using these products.

Calculate the internal volume of the system as closely as possible. See Table 11 and Table 13 for unit volumes. Use volume in Table 12 for glycol piping volumes.

! CAUTIONImmediately following the use of water for leak testing or system cleaning, charge the tested system with the proper percentage of glycol and water for your coldest design ambient. Complete system draindown cannot be assured and damage to the system could result from freezing of residual water.

Table 11 Indoor unit glycol volume approximate gallons (liters) max.Model Volume gal (l)

HMF 28 G 2.7 (10.2)

HMU 28 G 2.0 (7.6)

HMF 34 G 2.8 (10.6)

HMU 34 G 2.2 (8.3)

HMF 40 G 3.0 (11.4)

HMU 40 G 2.3 (8.7)

HMF 28 K 13.3 (50.3)

HMU 28 K 9.0 (34.1)

HMF 34 K 14.5 (54.9)

HMU 34 K 10.2 (38.6)

HMF 40 K 14.6 (55.3)

HMU 40 K 10.3 (39.0)

Table 12 Volume in standard Type “L” copper pipingDiameter (in.) Volume

Outside Inside Gal/Ft L/M1-1/8 1.025 0.043 0.53 1-3/8 1.265 0.065 0.81 1-5/8 1.505 0.092 1.15 2-1/8 1.985 0.161 2.00



4.5.2 Glycol Solutions

When considering the use of any glycol products in a particular application, you should review the lat-est Material Safety Data Sheets and ensure that the use you intend can be accomplished safely. For Material Safety Data Sheets and other product safety information, contact the supplier nearest you. Before handling any other products mentioned in the text, you should obtain available product safety information and take necessary steps to ensure safety of use.

No chemical should be used as or in a food, drug, medical device, or cosmetic, or in a product or pro-cess in which it may contact a food, drug, medical device, or cosmetic until the user has determined the suitability and legality of the use. Since government regulations and use conditions are subject to change, it is the user's responsibility to determine that this information is appropriate and suitable under current, applicable laws and regulations.

Typical inhibited formula ethylene glycol and propylene glycol manufacturers and suppliers are Union Carbide (Ucartherm) or Dow Chemical (Dowtherm SR-1, Dowfrost). These glycols are supplied with corrosion inhibitors and do not contain a silicone anti-leak formula. Commercial ethylene glycol, when pure, is generally less corrosive to the common metals of construction than water itself. Aque-ous solutions of these glycols, however, assume the corrosivity of the water from which they are pre-pared and may become increasingly corrosive with use if not properly inhibited.There are two basic types of additives: corrosion inhibitors and environmental stabilizers. The corro-sion inhibitors function by forming a surface barrier that protects the metals from attack. Environ-mental stabilizers, while not corrosion inhibitors in the strictest sense of the word, decrease corrosion by stabilizing or favorably altering the overall environment. An alkaline buffer such as borax is a sim-ple example of an environmental stabilizer since its prime purpose is to maintain an alkaline condi-tion (pH above 7).The percentage of glycol to water must be determined by using the lowest design outdoor temperature in which the system is operating. Table 13 indicates the solution freeze point at several concentra-tion levels of ethylene glycol. Propylene glycol concentrations should be 1% higher than the ethylene glycol table values to find the freeze point. For example, 41% propylene glycol freezes at -10°F.

NOTEGlycol solutions should be considered for protection of the coil. When it is not used, damage can occur from either freezing or corrosion from water.

! CAUTIONWhen mishandled, glycol products pose a threat to the environment. Before using any glycol products, review the latest Material Safety Data Sheets and ensure that you can use the product safely.

Glycol manufacturers request that the customer read, understand and comply with the information on the product packaging and in the current Material Safety Data Sheets. Make this information available to anyone responsible for operation, maintenance and repair of the drycooler and related equipment.

! CAUTIONAutomotive antifreeze is unacceptable and must NOT be used.

Table 13 Ethylene glycol concentrations% Glycol by Volume 0 * 10 20 30 40 50Freezing Point °F (°C) 32 (0) 25 (-3.9) 16 (-8.9) 5 (-15.0) -10 (-23.3) -32 (-35.5)Apparent Specific Gravity@ 50°F (10°C) 1 1.014 1.028 1.042 1.057 1.071

* A minimal amount of glycol should be considered for inhibitive coil protection.

! CAUTIONThe quality of water used for dilution must be considered because water may contain corrosive elements which reduce the effectiveness of the inhibited formulation. Water that is classified as soft (low in chloride and sulfate ion content less than 100 parts per million each) should be used.



4.5.3 Filling the SystemInstallation of hose bibs at the lowest point of the system is recommended. When filling a glycol sys-tem keep air to a minimum. Air in glycol turns to foam and is difficult and time-consuming to remove. (Anti-foam additives are available and may be considered.) Open all operating systems to the loop. With the top vent(s) open, fill the system from the bottom of the loop. This will allow the glycol to push the air out of the top of the system, minimizing trapped air. Fill to approximately 80% of calcu-lated capacity. Fill slowly from this point, checking fluid levels until full.

Figure 20 Drycoolers and pump packages

NOTEFor glycol solution preparation and periodic testing, follow manufacturer's recommendations. Do not mix products of different manufacturers.

Table 14 Drycooler dataModel

No. No. of Fans

Weightlbs (kg)

Drycooler Conn. Sizes(suction & discharge) in.

A Dimensionin. (mm)

B Dimensionin. (mm)

Coil InternalVolume gal (l)

-174 2 605 (274) 1-1/4 91-7/16 (2324) 84 (2134) 6.9 (26.2) -197 2 645 (293) 1-1/2 91-7/16 (2324) 84 (2134) 9.0 (34.0) -225 2 685 (310) 2 91-7/16 (2324) 84 (2134) 11.1 (42.1) -310 3 886 (402) 2 131-7/16 (3340) 124 (3150) 13.1 (50.0) -350 3 946 (429) 2 131-7/16 (3340) 124 (3150) 19.4 (73.3) -419 4 1120 (508) 2 171-1/2 (4356) 164 (4166) 17.4 (65.9)

Table 15 Glycol pump data*Pump Pump Suction

Connection in. Pump DischargeConnection in. HP HZ

1-1/22

HS35

60606060

1-1/41-1/41-1/41-1/2

3/43/43/4

1-1/4* Connection sizes apply to primary pump supplier

Notes: 1. Single pump packages are 17-1/4" (438mm) wide. Dual

pump packages are 32-1/4" (819mm) wide. 2. Mounting holes are 15-1/4" (387mm) apart on Single

pump packages and 30-1/4" (768mm) apart on Dual pump packages.

3. Connection sizes apply to primary pump supplier.

Drycooler

Provided on dual pump

package only

30-1/4"(768mm)

A

B

19"(483mm)

43-3/16"(1097mm)

43-9/16"(1105mm)

37-7/8"(1095mm)

GLYCOL PUMP PACKAGESee Note 1



Figure 21 Glycol general arrangement

Expansion tank field-installed at highest point in system

Drycooler electric box Drycooler

coil

Glycol pump

Pump housing

Evaporator coilLiquid-gas

mixerAccess valve

Solenoid valves

Sensing bulb

External equalizers

Service valve

High-pressure

Low-pressure switchconnection

Scroll compressor

Service valve

Brazed plate condenser

Brazed plate condenser

3-way water reg-ulating valve (optional)

2-wayregulatingvalve


* Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance

Liquid line check valve

Hot gas bypass

Fluid supplyto unit

Strainer*

Isolation valve*

Fluid returnfromunit

Airventsat topof risers*

Hose bib *

Expansion port *

Fluid supply from pump

Fluid return

to pumpUnions

Pressure port *

Flow regulating valve *

switchconnection

Expansion valve

Hotgas bypass valve

Fluidsupplyto unit

Fluid returnto unit

Hose bibs*

Bypass valve

Filter

dryer

Fill* Unions*

Isolation valves*

Isolation valve*



Figure 22 GLYCOOL general arrangement

PumpHousing

Glycol Pump

Unions*

IsolationValves*

ExpansionValve

DrycoolerCoil

DrycoolerElectricBox

Unions*

PressurePort*

HoseBib*

Fill*

FluidReturn toPump

FluidSupplyfromPump

Air Vents*at Top ofRisers

Flow RegulatingValve*

PressurePort*

SensingBulb

ExternalEqualizers

Hot GasBypassValve Scroll

Compressor

ServiceValvesHot Gas

BypassSolenoidValve

FilterDrier

Hot GasBypass

3-Way WaterRegulatingValve3-Way Chilled

Glycol Valve

ValveActuator


Econ-O-CoilCircuit

FluidSupply toUnit

FluidReturnfromUnit

IsolationValves*

HoseBibs*



Expansion Tank Field Installed atHighest Point in System

Brazed Plate

Low PressureSwitch Connection

Liquid-GasMixer

High PressureSwitch Connection

Liquid LineCheck Valve

Evaporator Coil

Econ-O-Coil

Strainer *



4.6 CondenserThe condenser is designed to operate in conjunction with a drycooler. The maximum coolant pressure is 150 psig (1034 kPa). A high pressure system rated at 350 psig (2413 kPa) is available as an option.

4.7 Glycol Regulating ValveThe glycol regulating valve automatically regulates the amount of coolant necessary to remove the heat from the refrigeration system, permitting more fluid to flow when load conditions are high and less fluid to flow when load conditions are low. The valve consists of a brass body, balance spring, valve seat, valve disc holders, capillary tube to discharge pressure, and adjusting screw.

4.7.1 Standard Valve-150psig (1034kPa) & High Pressure Valve-350psig (2413kPa) SystemsAdjustmentThe valve may be adjusted with a standard refrigeration service valve wrench or screwdriver.To lower the head pressure setting, turn the square adjusting screw clockwise until the high pressure gauge indicates the desired setting.To raise the head pressure setting, turn the adjusting screw counterclockwise until the desired set-ting is obtained.

Figure 23 Valve adjustment

Manual FlushingThe valve may be flushed by inserting a screwdriver or similar tool under the two sides of the main spring and lifting. This action will open the valve seat and flush any dirt particles from the seat. If this fails, it will be necessary to disassemble the valve and clean the seat.

4.7.2 Testing Valve FunctionWhen the refrigeration system has been off for approximately 10-15 minutes, the coolant flow should stop. Should the coolant continue to flow, the valve is either improperly adjusted or the pressure sensing capillary is not connected properly to the condenser.

Table 16 Refrigerant control settings psi (kPa)Low Pressure

Cut Out Low Pressure

Cut In High Pressure

Cut Out 20 (137.9) 65 (448.2) 360 (2482)

Range spring

Valve spring guide

Top retainer

Range adjustment screw

Insert screwdrivers underneath the valve spring guide


Dual Cool Models 41

5.0 DUAL COOL MODELS

5.1 Chilled Water Piping ConsiderationsManual shut-off valves should be installed at the supply and return chilled water lines to each unit. This will provide for routine service and emergency isolation of the unit.

Consideration of the minimum water temperature to be supplied from the chiller will determine if the need exists to insulate supply and return lines. Insulation will prevent condensation on the supply and return lines.

To provide for the emergency of water leaks and the consequences of sub-floor flooding, floor drains should be provided with wet traps or a water detection system, such as a Liqui-Tect, that is installed near the base of the unit or below the elevated floor.

5.2 Dual Cool General ArrangementFor Air Dual Cool units, refer to:

• Figure 8 - Piping connections for air dual cool units with Econ-O-Coil—upflow models (HMU)

• Figure 9 - Piping connections for air dual cool units with Econ-O-Coil—downflow mod-els (HMF)

• Figure 18 - Air cooled fan speed control general arrangement• Figure 19 - Air cooled Lee-temp general arrangement

For Glycol Dual Cool units, refer to:

• Figure 14 - Piping connections for glycol dual cool units—upflow models (HMU)• Figure 15 - Piping connections for glycol dual cool units—downflow models (HMF)• Figure 21 - Glycol general arrangement


42 Motor/Blower/Auto-Transformer

6.0 MOTOR/BLOWER/AUTO-TRANSFORMER

6.1 DescriptionThe Himod has two single-inlet, backward-curved, centrifugal-type blowers. Each blower has a direct drive fan motor. The fans are mounted on vibration absorbing rubber supports to reduce vibration. A field-adjustable auto-transformer provides the motor supply voltage for standard operation (high speed) and for reduced air flow with a lower voltage (low speed) when in dehumidification mode. The microprocessor will direct the high-speed motor contactor for high-speed (normal operation) or low-speed motor contactor for low speed (dehumidification mode).

A main fan auxiliary switch is provided to indicate when the unit is on.

A main fan overload set of contacts is activated when a motor overload alarm condition exists.

6.2 Blower CurvesFigure 24 through Figure 26 show performance of the Himod per the catalog/factory settings (shown by dot). For each tonnage, there is a unique blower curve for upflow units, for downflow units, for upflow with Econ-O-Coils (GLYCOOL or dual cool), and for downflow with Econ-O-Coils (GLY-COOL or dual cool).

NOTEThe factory setting (represented by dot) indicates the rated air flow: Q (CFM) and the rated external static pressure: AESP (IWG–inches water gauge), and the relevant motor voltage. This motor voltage is the high-speed motor voltage for normal operation as supplied by the auto-transformer. The low-speed or dehumidification air flow is approximately 12% less than the rated high-speed air flow.


Motor/Blower/Auto-Transformer 43

Figure 24 Blower curves - HMF/HMU28A/G, HMF/HMU28K/D/H

HM

F2

8A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [

CF

M]

AESP [IWG]

Q=5875 CFM

8 T

on

Do

wn

flo

w

Vo

lts

HM

F28K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=5875 CFM

8 T

on

Do

wn

flo

w E

co

n-O

-Co

ils

Vo

lts

HM

U28K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=5815 CFM

8 T

on

Up

flo

w E

co

n-O

-Co

ils

Vo

lts

HM

U2

8A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=5780 CFM

8 T

on

Up

flo

w

Vo

lts

AES

P =

Avai

labl

e Ex

tern

al S

tatic

Pre

ssur

e (IW

G)

Q =

Air

Flow

(CFM

)

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

320

210

360




HM

F34A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=6500 CFM

10 T

on

Do

wn

flo

w

Vo

lts

HM

F3

4K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=6450 CFM

10

To

n D

ow

nfl

ow

Ec

on

-O-C

oil

s

Vo

lts

HM

U34A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [

CF

M]

AESP [IWG]

Q=6350 CFM

10 T

on

Up

flo

w

Vo

lts

HM

U34K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=6170 CFM

10 T

on

Up

flo

w E

co

n-O

-Co

ils

Vo

lts

AES

P =

Avai

labl

e Ex

tern

al S

tatic

Pre

ssur

e (IW

G)

Q =

Air

Flow

(CFM

)

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290




HM

U4

0A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [C

FM

]

AESP [IWG]

Q=7335 CFM

12

To

n U

pfl

ow

Vo

lts

HM

U40K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [

CF

M]

AESP [IWG]

Q=6700 CFM

12

To

n U

pfl

ow

Eco

n-O

-Co

ils

Vo

lts

HM

F40A

/G

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [

CF

M]

AESP [IWG]

Q=7365 CFM

12 T

on

Do

wn

flo

w

Vo

lts

HM

F4

0K

/D/H

0

0.2

0.4

0.6

0.81

1.2

1.4

1.6

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [

CF

M]

AESP [IWG]

Q=6730 CFM

12

To

n D

ow

nfl

ow

Ec

on

-O-C

oil

s

Vo

lts

AES

P =

Avai

labl

e Ex

tern

al S

tatic

Pre

ssur

e (IW

G)

Q =

Air

Flow

(CFM

)

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290 440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

440

420

400

380

320

340

270

250

230

210

208

190

290

460

440

420

400

380

360

320

340

270

250

230

210

208

190

290

460

360



6.3 High Efficiency Filters and Related Pressure DropOptional 4" (100mm) deep, folded media type filters are interchangeable with the standard 20% series filters. The optional high efficiency filters are rated either 30% or 60-65% efficient per ASHRAE 52.1 standard. The optional 30% filters are rated at the same pressure drop as the standard 20% filters. The optional 60-65% filters are rated at a higher pressure drop, as shown in Figure 27.

6.3.1 Additional Pressure Drop: 60-65% Filters Substituting 20% FiltersThe pressure drop shown in Figure 27 must be deducted from the available external static pressure given in the unit blower curve.

Figure 27 Additional pressure drop for 60-65% filters

6.4 Standard Unit Auto-Transformer SettingsTable 17 and Table 18 show the factory settings for the units. To determine the correct settings, the unit model number and type must be known. Next, the relevant blower curve is used to find the cata-log airflow and external static pressure (See Figure 24 through Figure 26). The dot on the blower curve will indicate the catalog setting in addition to the motor voltage from the auto-transformer for standard operation (high speed). Table 17 and Table 18 will indicate the factory wiring for the auto-transformer high-speed and low-speed settings. Figure 28 shows an example of the auto-transformer connections for a model HMU40K/D/H, 460V - 3 phase -60 Hz with factory/catalog settings.

NOTEThe charts and figures are dependent on the “unit” input power. Be sure you are referring to the correct chart.

NOTEThe auto-transformer has three phases. Each connection is repeated for each phase.

0.200

0.150

0.100

0.050

0.000

65%

4000 4500 5000 5500 6000 6500 7000 7500 8000

Filte

r Pre

ssur

e D

rop

Res

ista

nce,

IWG

Air Flow Rate, CFM



Table 17 Factory settings for 208&230 V-60Hz units (unit voltage code C or D)

Unit Supply Voltage

Transformer InputConnector

(Brown Wire*) Auto-Transformer Part # LHR256331 208-3-60 A

230-3-60 B

ModelNumber

UnitDescription

Data fromBlower Curves

Standard OutputHigh Fan Speed

Dehumidification OutputLow Fan Speed

NominalHigh Fan

SpeedVolts

NominalLow FanSpeedVolts

TransformerTap

OutputConnector

(OrangeWire*)

Orange6"Jumper*

TransformerTap

OutputConnector(Red Wire*)

Red 6"Jumper*

ONE COIL UPFLOW

HMU28A/G_C/D 28kWAir/Glycol 240 205 230 B none 190 I B to M

HMU34A/G_C/D 34kWAir/Glycol 270 225 270 G B to E 230 B none

HMU40A/G_C/D 40kWAir/Glycol 460 285 460 D none 290 N B to I

ONE COIL DOWNFLOW

HMF28A/G_C/D 28kWAir/Glycol 220 185 210 E B to F 190 I B to M

HMF34A/G_C/D 34kWAir/Glycol 230 195 230 B none 190 I B to M

HMF40A/G_C/D 40kAir/Glycol 345 255 340 E C to G 250 L B to I

TWO COILS UPFLOW

HMU28K/D/H_C/D28kW

GLYCOOL/Dual-Cool

265 220 270 G B to E 230 B none

HMU34K/D/H_C/D34kW

GLYCOOL/Dual-Cool

280 230 290 H B to E 230 B none

HMU40K/D/H_C/D40kW

GLYCOOL/Dual-Cool

440 280 440 H C to E 290 N B to I

TWO COILS DOWNFLOW

HMF28K/D/H_C/D28kW

GLYCOOL/Dual-Cool

250 210 250 F B to E 210 I B to L

HMF34K/D/H_C/D34kW

GLYCOOL/Dual-Cool

265 220 270 G B to E 230 B none

HMF40K/D/H_C/D40kW

GLYCOOL/Dual-Cool

345 255 340 E C to G 250 L B to I

* Wiring Connection is repeated for each auto-transformer phase (3 total phases).



Table 18 Factory settings for 460 Volt - 60 Hz units (unit voltage code: A)

Unit Supply Voltage

Transformer Input Connector

(Brown Wire*) Auto-Transformer Part # LHR256297460-3-60 D

Model NumberUnit

Description

Data fromBlower Curves



NominalHigh Fan

SpeedVolts

NominalLow FanSpeedVolts

TransformerTap

OutputConnector

(OrangeWire*)Orange 6"Jumper*

TransformerTap

OutputConnector(RedWire*)

Red 6"Jumper*

ONE COIL UPFLOW

HMU28A/G_A 28kWAir/Glycol 240 205 230 A none 200 I A to M

HMU34A/G_A 34kWAir/Glycol 270 225 275 H A to E 230 A none

HMU40A/G_A 40kWAir/Glycol 460 285 460 D none 280 I B to M

ONE COIL DOWNFLOW

HMF28A/G_A 28kWAir/Glycol 220 185 215 E A to F 185 I A to N

HMF34A/G_A 34kWAir/Glycol 230 195 230 A none 200 I A to M

HMF40A/G_A 40kWAir/Glycol 345 255 340 G B to E 260 M A to I

TWO COILS UPFLOW

HMU28K/D/H_A28kW

GLYCOOL/Dual-Cool

265 220 260 G A to E 215 I A to L

HMU34K/D/H_A34kW

GLYCOOL/Dual-Cool

280 230 280 E B to G 230 A none

HMU40K/D/H_A40kW

GLYCOOL/Dual-Cool

440 280 445 H C to E 280 I B to M

TWO COILS DOWNFLOW

HMF28K/D/H_A28kW

GLYCOOL/Dual-Cool

250 210 245 F A to E 215 I A to L

HMF34K/D/H_A34kW

GLYCOOL/Dual-Cool

265 220 260 G A to E 215 I A to L

HMF40K/D/H_A40kW

GLYCOOL/Dual-Cool

345 255 340 G B to E 260 M A to I




Figure 28 Example of auto-transformer factory wiring for model HMU40K/D/H w/460V input voltage

T2

M

L

I

T1

H

G

F

E

D

C

B

A

N

M

L

I

H

G

F

E

D

C

B

A

N

M

L

I

H

G

F

E

D

C

B

A

N

PHASE 3

PHASE 2

PHASE 1

ATLO-LD1 ( R )

ATHI-LD1 ( OR )

ATIN-LN1 ( BR )

ATLO-LD2 ( R )

ATHI-LD2 ( OR )

ATIN-LN2 ( BR )

ATLO-LD3 ( R )

ATHI-LD3 ( OR )

ATIN-LN3 ( BR )

( OR

)

( R

)

24 VOLT INTERNAL

THERMAL OVERLOAD NOT USED

NOT USED

NOT USED

( 3 ) ORANGE WIRES TO

HIGH SPEED CONTACTOR( 3 ) RED WIRES TO

LOW SPEED CONTACTOR

( 3 ) BROWN

WIRES

FROM FUSES

( BR ) BROWN

( OR ) ORANGE

( R ) RED

RED HIGH

SPEED JUMPER

( TYPICAL 3 )

( OR

)

( R

)

( OR

)

( R

)

ORANGE LOW

SPEED JUMPER

( TYPICAL 3 )

*

*

* **

ALL CONNECTIONS SHOWN ARE FOR

STANDARD MODEL HMU40K/D/H,

460 VOLT UNIT ONLY. CONNECTIONS

WILL VARY PER UNIT MODEL,

VOLTAGE AND APPLICATION. SEE

WRITTEN DISCUSSION AND TABLES.

*



6.5 Field Adjustments to Air Volume and/or External Static PressureWhen a change (different from the catalog/factory pre-wired setting) for the unit air volume and/or the external static pressure is desired, the auto-transformer may be re-wired.

Figure 29 Transformer location, arrangement

! WARNINGUse a voltmeter to make sure power is turned off before making any electrical connections. Potentially lethal voltages exist within this equipment during operation.

! WARNINGIt is imperative that all wiring is done correctly. Miswiring can cause damage to the unit. Potentially lethal voltages exist within this equipment during operation.

! CAUTIONProper phasing is required to maintain the correct blower rotation direction.

As shown in Figure 29, Phase 1 is to the left, Phase 2 is in the center, and Phase 3 is on the right. (Figure 28 provides an example [rotated for viewing ease] of the auto-transformer factory wiring for a model HMU40K/D/H with 460V, 3 phase, 60 Hz power input.) Wires are marked with hot stamps that end with a 1 for Phase 1, a 2 for Phase 2, and a 3 for Phase 3. The individual jumpers go between terminals within a single phase. The specific terminals are dependent upon the desired voltage. Jumpers are not hot stamped. Never connect wires across the phases.

Phase 1 Phase 2 Phase 3



6.5.1 Procedure to Make a Field Wiring Change1. Turn off disconnect and main power to the unit.2. Refer to the specified unit blower curve.3. Find the desired air volume and external static pressure, and the relevant point. 4. Find the relevant motor voltage for this new point. (Follow the voltage curve up and to the left

scale for motor voltage.) This will be the standard, high-speed voltage needed for the motor.5. Confirm the unit input voltage (per unit model number, eighth digit) or the serial tag.6. Use Table 19 for 208 or 230V unit input voltage; use Table 20 for 460V unit input voltage.7. With the data and table selected in Steps 5 and 6, wire the unit for the nearest transformer tap

voltage for the desired high-speed motor voltage (in the “Standard Output” columns) as found in Step 3.

8. Continue to wire the unit for Low Fan Speed for dehumidification by following the select transformer tap voltage which is located in the table, just to the right of the same row of data used in Step 6.

9. Verify that all connections for high and low fan speed are made before restarting the unit.

Table 19 Settings for 208 or 230V- 60 Hz units (unit voltage code: C or D)

Unit Supply Voltage

Transformer InputConnector (Brown Wire*) Auto-TransformerPart # LHR256331

208-3-60 A230-3-60 B



TransformerTap

Output Connector(Orange Wire*)

Orange6" Jumper*

TransformerTap

Output Connector(Red Wire*)

Red6" Jumper*

210 E B to F 190 I B to M230 B none 190 I B to M250 F B to E 210 I B to L270 G B to E 230 B none290 H B to E 230 B none320 E C to H 250 L B to I340 E C to G 250 L B to I360 E C to F 270 M B to I380 C none 270 M B to I400 F C to E 270 M B to I420 G C to E 270 M B to I440 H C to E 290 N B to I460 D none 290 N B to I

* Wiring connection is repeated for each auto-transformer phase (3 total phases).



Table 20 Settings for 460V- 60 Hz units (unit voltage code: A)

Unit Supply Voltage

Transformer InputConnector (Brown Wire*) Auto-Transfomer Part # LHR256297

460-3-60 D

Standard Output High Fan Speed Dehumidification Output Low Fan SpeedTransformer

TapOutput Connector

(Orange Wire*)Orange

6" Jumper*Transformer

TapOutput Connector

(Red Wire*)Red

6" Jumper*215 E A to F 185 I A to N230 A none 200 I A to M245 F A to E 215 I A to L260 G A to E 215 I A to L275 H A to E 230 A none280 E B to G 230 A none295 E B to F 230 A none310 B none 245 L A to I325 F B to E 245 L A to I340 G B to E 260 M A to I355 H B to E 260 M A to I370 E C to G 260 M A to I385 E C to F 260 M A to I400 C none 275 N A to I415 F C to E 275 N A to I430 G C to E 275 N A to I445 H C to E 280 I B to M460 D none 280 I B to M




6.6 Example of Field Adjustment to Air Volume and/or External Static PressureThe following example illustrates how to proceed through the steps in 6.5 - Field Adjustments to Air Volume and/or External Static Pressure.

For this exercise, a model HMU28K_A is desired to have 5400 CFM and 0.8 IWG (rather than catalog rated 5815 CFM & 0.2 IWG).

1. Turn the unit disconnect and main power to the unit off.2. Refer to the Blower Curve for the model HMU28K/D/H.3. Locate 5400 CFM & 0.8 IWG on the curve (refer to Figure 30).4. Find the voltage nearest the point in Step 3, which is approximately 345V. This is the desired

motor voltage for the high fan speed.5. Per the model number of the noted unit, the eighth digit is “A” representing 460 volts. (Unit serial

tag would also state 460V.)6. Refer to Table 20 on page 52 (because the unit input power is 460V).7. Per the blower curve, the desired motor voltage was 345. Per Table 20, the nearest transformer

tap to 345 is 340V. (See Table 20.) The orange wire for each phase must be connected to the auto-transformer terminals “G.” The orange jumpers for each phase must be connected to the auto-transformer terminals “B & E.” Note, all the brown wire connections should be connected to the auto-transformer terminals “D.”

8. The low-speed transformer tap will be set for 260V per Table 20. The red wire for each phase must be connected to the auto-transformer terminals “M.” The red jumpers for each phase must be connected to the auto-transformer terminals “A & I.”

9. Verify that all connections for high and low fan speed have been made per Table 20.

! WARNINGUse a voltmeter to make sure power is turned off before making any electrical connections. Potentially lethal voltages exist within this equipment during operation.

! WARNINGIt is imperative that all wiring is done correctly. Miswiring can cause damage to the unit. Potentially lethal voltages exist within this equipment during operation.

! CAUTIONProper phasing is required to maintain the correct blower rotation direction.

As shown in Figure 29, Phase 1 is to the left, Phase 2 is in the center, and Phase 3 is on the right. (Figure 28 provides an example [rotated for viewing ease] of the auto-transformer factory wiring for a model HMU40K/D/H with 460V, 3 phase, 60 Hz power input.) Wires are marked with hot stamps that end with a 1 for Phase 1, a 2 for Phase 2, and a 3 for Phase 3. The individual jumpers go between terminals within a single phase. The specific terminals are dependent upon the desired voltage. Jumpers are not hot stamped. Never connect wires across the phases.



Figure 30 Field adjustment example using model HMU28K/D/H

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

4000

4200

4400

4600

4800

5000

5200

5400

5600

5800

6000

6200

6400

6600

6800

7000

7200

7400

7600

7800

8000

Q [CFM]

AE

SP

[IW

G]

Q=

5815 C

FM

340V

5400 CFM & 0.8 IWG

460V440V420V400V380V360V

320V

290V

270V

250V

230V

210V208V

190V

AESP = Available External Static Pressure Q = Air Flow

Volts


R407C Refrigerant 55

7.0 R407C REFRIGERANT

7.1 Technical NotesThe Himod design and manufacturing processes have been optimized to operate with “green” refriger-ant R407C. R407C is an HFC fluid (hydrofluorocarbon). (The Himod is also available with R22 for customers who have existing facilities that have not been converted to the R407C refrigerant.) The main features of R407C are:

• It is a non-azeotropic mixture made of R32/R125/R134a in which the percentage weight composi-tion is in ratio 23/25/52.

• It has thermophysical features similar to R22.• It has an ODP (Ozone Depletion Potential) equal to zero (0).• It is nonflammable in air.• It has low toxicity.

Figure 31 R407C refrigeration cycle

NOTER407C refrigerant is incompatible with the mineral oils that are usually used with R12 and R22. Therefore, new synthetic lubricants, based on polyester molecules, have been developed for their use.

NOTEThe pressure-enthalpy chart below illustrates the R407C refrigeration cycle and the resulting glide from the blend.

High-Pressure Side Low-Pressure Side

TCB condensing temperature bubble point (liquid) TLV liquid-steam temperature

TCR condensing temperature dew point (vapor) TER evaporating temperature dew point (vapor)

TCM average condensing temperature(TCB + TCM) / 2

TEM average evaporating temperature(TLV + TER) / 2

TL temperature of the refrigerant at the expansion valve inlet

TAC temperature of the overheated vapor at the compressor inlet

Superheat = TAC - TER Subcooling = TCB - TL

TCRTCMTCB

TL

TAC

TER

TEMTLVPE

PC

P


56 R407C Refrigerant

Table 21 R407C saturated vapor/liquid temperature/pressure dataGauge Pressure

psig (kPa)Liquid Temp

°F (°C)Vapor Temp

°F (°C)Gauge Pressure

psig (kPa)Liquid Temp

°F (°C)Vapor Temp

°F (°C)20 (138) -10.7 (-23.7) 1.5 (-16.9) 150 (1034) 74.8 (23.8) 84.9 (29.4)22 (152) -8.2 (-22.3) 4.0 (-15.6) 155 (1069) 76.8 (24.9) 86.8 (30.4)24 (165) -5.7 (-20.9) 6.4 (-14.2) 160 (1103) 78.7 (25.9) 88.7 (31.5)26 (179) -3.4 (-19.7) 8.7 (-12.9) 165 (1138) 80.6 (27) 90.5 (32.5)28 (193) -1.1 (-18.4) 11.0 (-11.7) 170 (1172) 82.5 (28.1) 92.3 (33.5)30 (207) 1.1 (-17.2) 13.1 (-10.5) 175 (1207) 84.3 (29.1) 94.0 (34.4)32 (221) 3.2 (-16) 15.2 (-9.3) 180 (1241) 86.1 (30.1) 95.8 (35.4)34 (234) 5.3 (-14.8) 17.2 (-8.2) 185 (1276) 87.8 (31) 97.5 (36.4)36 (248) 7.3 (-13.7) 19.2 (-7.1) 190 (1310) 89.6 (32) 99.1 (37.3)38 (262) 9.2 (-12.7) 21.0 (-6.1) 195 (1344) 91.3 (32.9) 100.7 (38.2)40 (276) 11.1 (-11.6) 22.9 (-5.1) 200 (1379) 92.9 (33.8) 102.3 (39.1)42 (290) 12.9 (-10.6) 24.7 (-4.1) 205 (1413) 94.6 (34.8) 103.9 (39.9)44 (303) 14.7 (-9.6) 26.4 (-3.1) 210 (1448) 96.2 (35.7) 105.4 (40.8)46 (317) 16.4 (-8.7) 28.1 (-2.2) 215 (1482) 97.7 (36.5) 107.0 (41.7)48 (331) 18.1 (-7.7) 29.7 (-1.3) 220 (1517) 99.3 (37.4) 108.4 (42.4)50 (345) 19.7 (-6.8) 31.3 (-0.4) 225 (1551) 100.8 (38.2) 109.9 (43.3)52 (359) 21.3 (-5.9) 32.9 (0.5) 230 (1586) 102.3 (39.1) 111.4 (44.1)54 (372) 22.9 (-5.1) 34.4 (1.3) 235 (1620) 103.8 (39.9) 112.8 (44.9)56 (386) 24.4 (-4.2) 35.9 (2.2) 240 (1655) 105.3 (40.7) 114.2 (45.7)58 (400) 25.9 (-3.4) 37.4 (3) 245 (1689) 106.7 (41.5) 115.6 (46.4)60 (414) 27.4 (-2.6) 38.8 (3.8) 250 (1724) 108.2 (42.3) 116.9 (47.2)62 (427) 28.8 (-1.8) 40.2 (4.6) 255 (1758) 109.6 (43.1) 118.2 (47.9)64 (441) 30.2 (-1) 41.6 (5.3) 260 (1793) 111.0 (43.9) 119.6 (48.7)66 (455) 31.6 (-0.2) 43.0 (6.1) 265 (1827) 112.3 (44.6) 120.9 (49.4)68 (469) 33.0 (0.6) 44.3 (6.8) 270 (1862) 113.7 (45.4) 122.1 (50.1)70 (483) 34.3 (1.3) 45.6 (7.6) 275 (1896) 115.0 (46.1) 123.4 (50.8)72 (496) 35.6 (2) 46.9 (8.3) 280 (1931) 116.3 (46.8) 124.7 (51.5)74 (510) 36.9 (2.7) 48.1 (8.9) 285 (1965) 117.6 (47.6) 125.9 (52.2)76 (524) 38.2 (3.4) 49.3 (9.6) 290 (1999) 118.9 (48.3) 127.1 (52.8)78 (538) 39.4 (4.1) 50.6 (10.3) 295 (2034) 120.2 (49) 128.3 (53.5)80 (552) 40.6 (4.8) 51.8 (11) 300 (2068) 121.4 (49.7) 129.5 (54.2)82 (565) 41.9 (5.5) 52.9 (11.6) 305 (2103) 122.7 (50.4) 130.7 (54.8)84 (579) 43.0 (6.1) 54.1 (12.3) 310 (2137) 123.9 (51.1) 131.8 (55.4)86 (593) 44.2 (6.8) 55.2 (12.9) 315 (2172) 125.1 (51.7) 133.0 (56.1)88 (607) 45.4 (7.4) 56.3 (13.5) 320 (2206) 126.3 (52.4) 134.1 (56.7)90 (621) 46.5 (8.1) 57.4 (14.1) 325 (2241) 127.5 (53.1) 135.2 (57.3)92 (634) 47.6 (8.7) 58.5 (14.7) 330 (2275) 128.7 (53.7) 136.3 (57.9)94 (648) 48.7 (9.3) 59.6 (15.3) 335 (2310) 129.8 (54.3) 137.4 (58.6)96 (662) 49.8 (9.9) 60.7 (15.9) 340 (2344) 131.0 (55) 138.5 (59.2)98 (676) 50.9 (10.5) 61.7 (16.5) 345 (2379) 132.1 (55.6) 139.6 (59.8)

100 (689) 51.9 (11.1) 62.7 (17.1) 350 (2413) 133.2 (56.2) 140.6 (60.3)105 (724) 54.5 (12.5) 65.2 (18.4) 355 (2448) 134.3 (56.8) 141.7 (60.9)110 (758) 57.0 (13.9) 67.7 (19.8) 360 (2482) 135.4 (57.4) 142.7 (61.5)115 (793) 59.5 (15.3) 70.0 (21.1) 365 (2517) 136.5 (58.1) 143.7 (62.1)120 (827) 61.8 (16.6) 72.3 (22.4) 370 (2551) 137.6 (58.7) 144.7 (62.6)125 (862) 64.1 (17.8) 74.6 (23.7) 375 (2586) 138.7 (59.3) 145.7 (63.2)130 (896) 66.4 (19.1) 76.7 (24.8) 380 (2620) 139.8 (59.9) 146.7 (63.7)135 (931) 68.5 (20.3) 78.8 (26) 385 (2654) 140.8 (60.4) 147.7 (64.3)140 (965) 70.7 (21.5) 80.9 (27.2) 390 (2689) 141.8 (61) 148.7 (64.8)

145 (1000) 72.8 (22.7) 82.9 (28.3) 395 (2723) 142.9 (61.6) 149.6 (65.3)


Ancillary Items 57

8.0 ANCILLARY ITEMS

8.1 Condensate PumpShips loose for field piping.

8.2 Base ModuleShips loose, used to elevate upflow units when no floorstand or raised floor is available. Refer to instructions, which ship with the base module. Refer to Figure 3 for dimensions.

8.3 Fresh Air KitShips loose, used to provide a minimal amount of fresh air to the unit. Do not use fresh air below the dew point of any location in the room or unit. Pre-conditioned air is required. Installation instructions are shipped with the fresh air kit.


Ensuring The High Availability0f Mission-Critical Data And Applications.

Emerson Network Power, the global leader in enabling business-criticalcontinuity, ensures network resiliency and adaptability througha family of technologies—including Liebert power and coolingtechnologies—that protect and support business-critical systems.Liebert solutions employ an adaptive architecture that respondsto changes in criticality, density and capacity. Enterprises benefitfrom greater IT system availability, operational flexibility andreduced capital equipment and operating costs.

While every precaution has been taken to ensure the accuracyand completeness of this literature, Liebert Corporation assumes noresponsibility and disclaims all liability for damages resulting from use ofthis information or for any errors or omissions.© 2006 Liebert CorporationAll rights reserved throughout the world. Specifications subject to changewithout notice.® Liebert and the Liebert logo are registered trademarks of LiebertCorporation. All names referred to are trademarksor registered trademarks of their respective owners.

Technical Support / ServiceWeb Site

www.liebert.comMonitoring

[email protected]

Outside the US: 614-841-6755Single-Phase UPS

[email protected]

Outside the US: 614-841-6755Three-Phase UPS

[email protected]

Environmental Systems800-543-2778

Outside the United States614-888-0246

LocationsUnited States

1050 Dearborn DriveP.O. Box 29186

Columbus, OH 43229Europe

Via Leonardo Da Vinci 8Zona Industriale Tognana

35028 Piove Di Sacco (PD) Italy+39 049 9719 111

Fax: +39 049 5841 257Asia

7/F, Dah Sing Financial Centre108 Gloucester Road, Wanchai

Hong Kong852 2572220

Fax: 852 28029250

EmersonNetworkPower.comEmerson Network Power. The global leader in enabling Business-Critical Continuity™.

Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co.

©2006 Emerson Electric Co.

Integrated Cabinet Solutions

AC Power SystemsConnectivity

DC Power Systems

Embedded ComputingEmbedded Power Power Switching & Control

Precision Cooling

ServicesOutside PlantSite Monitoring

Surge Protection

SL-12030_REV1_08-06

DIS

CON

TIN

UED

P

RO

DU

CT

Documents

Liebert Himod - Faulkner Haynes & Associates · 2017-11-29 · Precision Cooling For Business-Critical Continuity Liebert Himod™ Installation Manual - 8, 10 & 12 Tons, 60Hz ˜˚˛˝˙ˆˇ˚ˆ˘