SERVICE CHA16 UNIT INFORMATION 2–5 TON UNITSwebmanuals.lennoxeurope.com/Out of Production/Rooftop/CHA/CHA 16... · SERVICE CHA16 UNIT INFORMATION Page 1 ... 8.7 2 lbs. 12 oz. 9

SERVICE CHA16UNIT

INFORMATION

Page 1 1991 Lennox Industries Inc.

Corp. 9121L7 Litho U.S.A.25 TON UNITS

CHA16 SERIES UNITS2 THROUGH 5 TON UNITS

CHA16 series units in the 25 ton sizes wereintroduced in the spring of 1990. The single packagecooling units may be used in both residential and com-mercial applications. Electric heat is available in sever-al Kw sizes. Units are designed for rooftop or side ofbuilding installation with either bottom or horizontaldischarge.

For commercial applications, the CHA16 is designedto accept any of several different thermostat controlsystems with minimum field wiring. Control optionssuch as economizer, warm up kit, Honeywell W973control or Honeywell W7400 control connect to theunit with jackplugs. When plugged in the controls be-come an integral part of the unit wiring. Commercialunits are also equipped with a low voltage terminalstrip to facilitate thermostat field wiring.

All specifications in this manual are subject to change.

Introduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications Pages 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Data Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessory Air Resistance Data Page 5. . . . . . . . . . . . . . . . . . . Diffuser Air Resistance Data Page 5. . . . . . . . . . . . . . . . . . . . . . Blower Performance Data Pages 6-8. . . . . . . . . . . . . . . . . . . . . Parts Arrangement Page 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I APPLICATION Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II UNIT COMPONENTS Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Box Components Pages 9-13. . . . . . . . . . . . . . . . . . . . Control Transformer Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . Low Voltage Terminal Strip Page 11. . . . . . . . . . . . . . . . . . . . . Low Voltage Fuse Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling Contactor Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575 Volt Autotransformer Page 12. . . . . . . . . . . . . . . . . . . . . . Indoor Blower Relay Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . Potential Relay Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Start Capacitor Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Capacitor Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Run Capacitor Page 13. . . . . . . . . . . . . . . . . . . . . Condenser Fan Capacitor Page 13. . . . . . . . . . . . . . . . . . . . . . Cooling Components Pages 13-17. . . . . . . . . . . . . . . . . . . . . . . Compressor Page 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loss of Charge Switch Page 15. . . . . . . . . . . . . . . . . . . . . . . . . Condenser Coil Page 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Evaporator Coil Page 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermometer Well Page 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan and Blower Components Pages 17-18. . . . . . . . . . . . . . . . Condenser Fan and Motor Page 17. . . . . . . . . . . . . . . . . . . . . Condenser Fan Motor Capacitor Page 17. . . . . . . . . . . . . . . . Blower Motor Pages 17,18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Blower Motor Capacitor Page 18. . . . . . . . . . . . . . . . . . . . . . .

III OPTIONAL ECH16 ELECTRIC HEAT Page 18. . . . . . . . . . . . . Matchups and Ratings Page 18. . . . . . . . . . . . . . . . . . . . . . . . . Components Pages 18-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conventional Relays Page 18. . . . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Specification Tables Pages 19-23. . . . . . . . . . . . Electric Heat Parts Arrangements Pages 24-27. . . . . . . . . . . . Thermal Heat Relays Page 27. . . . . . . . . . . . . . . . . . . . . . . . . . Resistor Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot Relay Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time Delay Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current Limiting Fuses Page 28. . . . . . . . . . . . . . . . . . . . . . . . . Primary High Temperature Limit Pages 28,29. . . . . . . . . . . . . Secondary High Temperature Limit Page 29. . . . . . . . . . . . . Thermal Cutoff Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heating Elements Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV PLACEMENT AND INSTALLATION Page 30. . . . . . . . . . . . . . V ELECTRICAL CONNECTIONS Page 30. . . . . . . . . . . . . . . . . . . VI START-UP Page 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII REFRIGERATION SYSTEM SERVICE CHECKS Pages 30,31.

Gauge Manifold Attachment Page 30. . . . . . . . . . . . . . . . . . . Charging Pages 30-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VIII BLOWER OPERATION AND ADJUSTMENT Page 32. . . . . . Blower Operation Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Determining Unit CFM Page 32. . . . . . . . . . . . . . . . . . . . . . . . . Blower Speed Adjustment Pages 32-35. . . . . . . . . . . . . . . . . .

IX MAINTENANCE Page 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Filters Page 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lubrication Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Evaporator Coil Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Condenser Coil Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

X ACCESSORIES Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lifting Lugs Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RMF16 Roof Mounting Frame Pages 36-37. . . . . . . . . . . . . . . Economizers Pages 37-46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Condenser Coil Guard Kit Page 46. . . . . . . . . . . . . . . . . . . . . . Compressor Crankcase Heater Page 46. . . . . . . . . . . . . . . . . DF16 Downflow Filter Kit Page 46. . . . . . . . . . . . . . . . . . . . . . . Timed-off Control Kit Page 46,47. . . . . . . . . . . . . . . . . . . . . . . . Optional Compressor Monitor Pages 46,48. . . . . . . . . . . . . . . Low Ambient Kit Pages 49,50. . . . . . . . . . . . . . . . . . . . . . . . . . . Roof Curb Power Kit Page 51. . . . . . . . . . . . . . . . . . . . . . . . . . . Transitions and Supply/Return Diffusers Page 51. . . . . . . . Status Panels Pages 51-60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

XI FIELD WIRING Pages 61-67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . XII WIRING DIAGRAMS AND SEQUENCE OF OPERATION

Wiring Diagrams and Sequence of Operation Pages 68101Basic Residential Unit with Basic Thermostat Pages 68,69. CHA16H with Three-Position Economizer Pages 70,71. . . . . CHA16H with Modulating Economizer Pages 72,73. . . . . . . Basic Single-Phase Commercial Unit Pages 74,75. . . . . . . . . Basic 208/230V Three-Phase Commercial Unit Pages 75,76Basic 460V or 575V Commercial Unit Pages 78,79. . . . . . . . . Basic Three-Position Economizer Operation Pages 80,81. . Basic Modulating Economizer Operation Pages 82,83. . . . . Warm Up Kit Operation with 3-Position Econ Pages 84,85. Warm Up Kit Operation with Modulating Econ Pages 85,86Night Kit Operation Pages 87,88. . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Operation Pages 90-101. . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS

Model No. CHA16H261 CHA16H311 ARI Standard 270 SRN (bels)

*ARIStandard210Ratings

Total Cooling Capacity (Btuh)

Total unit wattsSEER (Btuh/Watts)

EER (Btuh/Watts)Refrigerant (R22) charge

EvaporatorBlower

Blower wheel nominal diameter x width (in.)Motor horsepower

Air volume range (cfm)

EvaporatorCoil

Net face area (sq. ft.)Tube diameter (in.) & Number of rows

Fins per inch

Condenser

Coil

Net face area (sq. ft.)

Tube diameter (in.) & Number of rowsFins per inch

Condenser

Fan

Diameter (in.) & Number of bladesAir volume (cfm)

Motor horsepowerMotor watts

Condensate drain size mpt (in.)

Line voltage dataRecommended max. fuse size (amps)

Minimum circuit ampacity

Electrical characteristics

Optional Lifting Lug KitOptional Condenser Coil Guards

Optional Duct EnclosureNumber and size of filters (in.)

Optional Roof Mounting Frame (used with RDE1641 only)

Optional Economizer

Dampers

Model

No.3 positionModulating

Number andsizeof filters (in.)

Optional Ceiling Supply andReturn Air Diffusers

Step Down

FlushTransition

7.823,200

26509.8

8.72 lbs. 12 oz.

9 x 71/3

600 10003.20

3/8 2

156.80

3/8 120

18 42100

1/62003/4

30

19.0

7.828,600

2509.70

8.803 lbs. 10 oz.

9 x 81/3

750 12503.20

3/8 2

176.80

3/8 1.6020

18 42000

1/61603/4

30

20.0

208/230 volts 60 hz 1 phase

LB62125DBLB82199CA

RDE1641(1) 20 x 24 x 1 (fiberglass)

RMF1641

REMD1641REMD16M41

(1) 16 x 25 x 1

RTD965

FD965SRTH1665

Optional Outdoor Air Dampers (manual) OAD346/65

Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.

Sound Rating Number in accordance with ARI Standard 270.

*Rated in accordance with ARI Standard 210 and DOE; 95F outdoor air temperature and 80F db/67F wb entering evaporator air.**For LPG units a field changeover kit is required and must be ordered extra.

SPECIFICATIONSCHA16H RESIDENTIAL HORIZONTAL ONLY UNITS

IndoorOutdoor (1) 14 x 25 x 1 (aluminum mesh)

Two stage cooling thermostat required with economizer applications.

with Gravity Exhaust

OptionalElectric

HeatRatings

ECH16R5

ECH16R7

ECH16R10

ECH1615

Output BtuhA.F.U.E.Output BtuhA.F.U.E.

Output BtuhA.F.U.E.

Output BtuhA.F.U.E.

19,00099.0%

25,00099.0%35,000

99.0%

52,000

99.0%

19,00099.0%

25,00099.0%35,000

99.0%

52,000

99.0%

Indoor filter is not furnished and must be field provided.

Model No.

ARI Standard 270 SRN (bels)


Total Cooling Capacity (Btuh)

Total unit watts

SEER (Btuh/Watts)

EER (Btuh/Watts)

Refrigerant (R22) charge

Evaporator

Blower

Blower wheel nom. dia. x width (in.)

Motor horsepower

Air volume range (cfm)

Evaporator

Coil


Tube dia. (in.) & Number of rows

Fins per inch

Condenser

Coil


Tube dia. (in.) & Number of rows

Fins per inch

Condenser

Fan

Diameter (in.) & Number of blades

Air volume (cfm)

Motor horsepower

Motor watts


Line voltage Recommended max. fuse size (amps)

Minimum circuit ampacity


Optional Lifting Lug Kit

Optional Condenser Coil Guards

7.834,000

3910

9.60

8.70

4 lbs. 12 oz.

10 x 7

1/3

900 1500

4.10

3/8 2

15

8.60

3/8 2

20

20 4

2200

1/6

220

3/4

45

27.0

208/230 volts 60 hz 1 phase

LB62125DB

LB82199CC

8.046,500

5470

9.50

8.50

5 lbs. 9 oz.

10 x 8

1/2

1200 2000

5.80

3/8 2

15

14.30

3/8 1.4

20

24 4

4000

1/4

340

3/4

60

36.0

8.056,000

6665

9.4

8.40

7 lbs. 0 oz.

12 x 8

3/4

1500 2500

5.80

3/8 2

15

14.30

3/8 2

20

24 4

3600

1/4

360

3/4

60

42.0

LB82199CB

Optional Outdoor Air Dampers (manual) OAD1665OAD1641

Outer coil

Inner coil

data

CHA16R651CHA16R411 CHA16R511

Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations. Sound Rating Number in accordance with ARI Standard 270.

*Rated in accordance with ARI Standard 210 and DOE; 95F outdoor air temperature and 80F db/67F wb entering evaporator air.**For LPG units a field changeover kit is required and must be ordered extra.

8.40 5.90 13.80

SPECIFICATIONSCHA16R RESIDENTIAL UNITS

OptionalElectric

HeatRatings

ECH16R5

ECH16R7

ECH16R10

ECH1615


Output BtuhA.F.U.E.

Output BtuhA.F.U.E.

19,00099.0%

26,00099.0%36,000

99.0%

53,000

99.0%

27,00099.0%37,000

99.0%

54,000

99.0%

ECH16R10

ECH1615

Output BtuhA.F.U.E.

Output BtuhA.F.U.E.

70,000

99.0%

71,000

99.0%

88,000

99.0%

27,00099.0%37,000

99.0%

54,000

99.0%71,000

99.0%

88,000

99.0%

Optional Downflow Adaptor Kit Model no, Filters DF1665, (1)20x25x1(polyurethane)

DF1641,(1)16x25x1

(polyurethane)

Model No. CHA16411 ARI Standard 270 SRN (bels)


Total Cooling Capacity (Btuh)Total unit wattsSEER (Btuh/Watts)EER (Btuh/Watts)

Refrigerant (R22) charge

EvaporatorBlower

Blower wheel nominal dia. x width (in.)Motor horsepowerAir volume range (cfm)

EvaporatorCoil

Net face area (sq. ft.)Tube dia. (in.) & No of rows & Fins/in.

CondenserCoil

Net face area (sq. ft.) outer/innerTube diameter (in.) & Number of rowsFins per inch

CondenserFan

Diameter (in.) & Number of bladesAir volume (cfm)Motor horsepower & Motor watts


Line voltage fuse size (amps)

Minimum circuit


Lifting Lugs (Brackets)Optional Condenser Coil Guards

7.834,00039109.608.70

4 lbs. 12 oz.10 x 7

1/3900 1500

4.103/8 2 15

8.60/8.403/8 2

2020 42200

1/6 2403/445

208/230 volts 60 hz 1 or 3 phase 460 or 575 volts 3 phase

CHA16511 CHA16651

8.046,50054709.508.50

5 lbs. 9 oz.10 x 8

1/21200 2000

5.803/8 2 1514.30/5.903/8 1.40

2024 44000

1/4 3403/460

8.056,00066659.408.40

7 lbs. 0 oz.12 x 8

3/41500 2500

5.803/8 2 1514.30/13.80

3/8 220

24 43600

1/4 3603/460

LB82199CB

Optional Outdoor Air Dampers (manual) OAD1665OAD1641

CHA16413 CHA16513 CHA16653

Data(60hz)

Recommended max.

ampacity

208/230v 1 ph3 ph

460v 3 ph

208/230v 1 ph3 ph460v 3 ph

30 40 4515 20 25

27.0 36.0 42.020.0 26.0 29.010.0 14.0 16.0

Number and Size of Filters (in.)Optional Roof Mounting Frame

OptionalEconomizerDampers

Model No.

3 positionModulatingNo. & sizeof filters (in.)

Optional

EconomizerDampers

Model No.

3 positionModulatingNo. & sizeof filters (in.)

Horizontal

Older CHA16 series units use optional field installed lifting lug kit LB62125DB.

LB82199CC

Optional Ceiling Supply andReturn Air Diffusers

Step DownFlushTransition

Optional Controls Selection

Electromechanical Thermostat Honeywell W973 Control System with T7067 ThermostatHoneywell W7400 Control System with T7400 Thermostat

Flexstat Thermostat (discontinued as an option after August 1989)Prostat ThermostatT7300 Thermostat

Commercial ControlsOptional Control Mounts

Downflow applicationHorizontal application

Optional Gravity Exhaust DampersOptional Roof Curb Power Entry Kit

(1) 20x25x1 (polyurethane)(1)16x25x1 (polyurethane)RMF1641 RMF1641 or RMF1665

REMD1641 REMD1665

(1) 14 x 25 x 1 (polyurethane) (1) 18 x 25 x 1 (polyurethane)REMD16M41 REMD16M65

(1) 14 x 25 x 1 (aluminum mesh) (1) 18 x 25 x 1 (aluminum mesh)EMDH1641 EMDH1665

(1) 20 x 24 x 1 (fiber glass) (1) 16 x 25 x 1 & (1) 14 x 25 x 1 (fiber glass)EMDH16M41 EMDH16M65

(1) 8 x 24 x 1 (aluminum mesh) (1) 8 x 28 x 1 (aluminum mesh)

RTD965FD965

SRT1665

23H13 23H1424H61

Furnished Factory InstalledGEDH1665 (use with EMDH16 or EMDHM16)

18H70 (1/2)

Furnished as standard.Consists of: factory installed controls wiring harness, high pressure switch, loss of charge switch, low voltage terminal strip and compressor crankcase heater.Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.

Sound Rating Number in accordance with ARI Standard 270.

*Rated in accordance with ARI Standard 210 and DOE; 95F outdoor air temperature and 80F db/67F wb entering evaporator air.

SPECIFICATIONS CHA16 COMMERCIAL UNITS

IndoorOutdoor

IndoorOutdoor

OptionalElectric

HeatRatings

ECH16R5

ECH16R7

ECH16R10

ECH1615

Output BtuhA.F.U.E.Output BtuhA.F.U.E.Output BtuhA.F.U.E.Output BtuhA.F.U.E.

19,00099.0%26,00099.0%36,000

99.0%53,00099.0%

27,00099.0%37,000

99.0%54,00099.0%

ECH16R10

ECH1615


70,00099.0%

71,00099.0%88,00099.0%

27,00099.0%37,000

99.0%54,00099.0%71,00099.0%88,00099.0%

Furnished, Field Installed Furnished, Factory Installed

ELECTRICAL DATA

Line Voltage Data - 60Hz. 1ph

Model No.

Compressor

CondenserFan MotorEvaporator

BlowerRecommended Max. Fuse Size (amps)Unit Power Factor

Rated Load AmpsLocked Rotor AmpsFull Load AmpsLocked Rotor AmpsFull Load AmpsLocked Rotor Amps

CHA16H-261 CHA16H-311

CHA16-413 CHA16-513 CHA16-653

Line Voltage Data - 60Hz. 3ph

Model No.

Compressor

CondenserFan MotorEvaporator

BlowerRecommended Max. Fuse Size (amps)Unit Power Factor

Rated Load AmpsLocked Rotor AmpsFull Load AmpsLocked Rotor AmpsFull Load AmpsLocked Rotor Amps

208/230v 208/230v

208/230v 208/230v 208/230v460v 460v 460v

12.1 13.557.0 77.4.09 .901.5 1.52.1 2.14.6 4.630 30

19.0 20.0

11.3 5.2 15.4 8.4 17.7 9.466.0 35.0 90.0 45.0 105 551.1 0.70 2.3 1.1 2.3 1.12.2 1.3 4.4 2.0 4.4 2.03.0 1.8 3.9 1.8 4.6 1.86.2 4.4 8.3 4.4 10.0 3.825 15 40 20 45 20.86 .87 .88 .88 .89 .89

Where current does not exceed 60 amps, HACR circuit breaker may be used in place of fuse.NOTE Extremes of operating range are plus and minus 10% of line voltage.*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements.

*Minimum Circuit Ampacity.99 .95

*Minimum Circuit Ampacity 19.0 9.0 26.0 14.0 30.0 15.0

CHA16H261311 AND CHA16(R)411511651 MODELS SINGLE PHASE VOLTAGE

CHA16(R)411

208/230v17.983.51.12.23.06.240

27.0.95

CHA16(R) 651

208/230v27.6135.0

2.34.44.610.060

42.0.97

CHA16(R)511

208/230v23.4118.0

2.34.43.98.350

36.0.92

CHA16413513653 MODELS THREE PHASE VOLTAGE

575v6.536.0

1.1

15.8812.0

Motors are rated at 460 volts. Full Load Amps shown are for step-down transformer output.

2.0 1.8 4.4

575v4.529.0

0.7

15.869.0

1.3 1.8 4.4

575v6.345.0

1.1

15.8911.0

2.0 1.8 3.8

ACCESSORY AIR RESISTANCE

UnitModelNo.

AirVolume

(cfm)

REMD16 DownflowEconomizer

Total Resistance (inches water gauge)

EMDH16EconomizerDownflow

*RDE1641Duct

Enclosure

DF16 Downflow Filter Adaptor Kit

CHA16H261CHA16H311

80010001200

CHA16410

800100012001400

CHA16510CHA16650

1600180020002200

.15

.18

.21

.15

.18

.21

.25

.20

.23

.27

.32

.18.26.35.46.30.35.40.47

.11

.19

.22

.15.18.21.25.15.17.20.23

With1 Filter

WithoutFilter

With1 Filter

WithoutFilter

.05

.06

.09

.05

.06

.09

.15

.05

.06

.08

.10

.10.15.21.29.17.19.22.26

*Air resistance is with air filter in place.NOTEElectric heaters have no appreciable air resistance.

WithPleated2 Filter

WithFiberglass2 Filter

With1 Filter

WetEvaporator

Coil

.27

.34

.42

.40

.48

.56

.66

.25

.29

.36

.47

.36

.41

.47

.54

.51

.27.34.42.51.35.42.49.57

.13.18.24.31.22.27.32.37

.08

.09

.10

.08

.09

.10

.11

.09

.10

.11

.12

WithPleated2 Filter

WithFiberglass2 Filter

Air resistance is with pleated non-woven cotton fabric filter.

DIFFUSER AIR RESISTANCE

UnitModelNumber

AirVolume

(cfm)

RTD965 Diffuser

2 EndsOpen

1 Side2 EndsOpen

All Ends& Sides

Open

FD965Diffus-

er

CHA16H-261

CHA16H-311

CHA16-410

CHA16-510

CHA16-650

800

1000

1200

800

1000

1200

1400

1600

1800

2000

2200

.15

.19

.25

.15

.19

.25

.33

.43

.56

.73

.95

.13

.16

.20

.13

.16

.20

.26

.32

.40

.50

.63

.11

.14

.17

.11

.14

.17

.20

.24

.30

.36

.44

.11

.14

.17

.11

.14

.17

.20

.24

.30

.36

.44

CHA16H-261 BLOWER PERFORMANCE @ 230 VOLTS(With Horizontal Supply and Return Air Openings)

External Static Air Volume (cfm) @ Various Speeds

Pressure(in. wg) High MedHigh MedLow Low

0 1345 1000 880 710

.05 1320 995 870 705

.10 1290 995 855 695

.15 1265 985 845 690

.20 1240 975 830 680

.25 1210 960 815 670

.30 1180 940 795 660

.40 1120 895 760 630

.50 1055 840 710 585

.60 975 570 645 525

.70 880 525 565 450

.75 825 475 515 405NOTE All cfm data is measured external to unit.CHA16(R)-411-413 BLOWER PERFORMANCE @ 230 VOLTS

(With Horizontal Supply and Return Air Openings)



0 1490 1460 1145 920

.05 1470 1440 1135 910

.10 1450 1420 1125 900

.15 1435 1395 1120 895

.20 1430 1375 1115 890

.25 1400 1375 1105 880

.30 1380 1355 1095 870

.40 1335 1335 1070 850

.50 1285 1285 1030 830

.60 1235 1235 985 790

.70 1185 1140 935 730

.75 1160 1110 905 690NOTE All cfm data is measured external to unit.

CHA16(R)-511-513 BLOWER PERFORMANCE @ 230 VOLTS(With Horizontal Supply and Return Air Openings)



0 2140 1785 1535 1305

.05 2115 1770 1530 1300

.10 2090 1755 1520 1295

.15 2070 1745 1510 1290

.20 2045 1730 1500 1285

.25 2020 1715 1490 1280

.30 1995 1700 1480 1275

.40 1935 1665 1460 1260

.50 1875 1630 1430 1235

.60 1800 1585 1400 1205

.70 1710 1530 1370 1170


CHA16H-311 BLOWER PERFORMANCE @ 230 VOLTS(With Horizontal Supply and Return Air Openings)



0 1530 1065 905 720

.05 1505 1060 905 720

.10 1475 1050 905 720

.15 1450 1040 900 715

.20 1425 1030 900 715

.25 1400 1020 895 710

.30 1375 1010 890 705

.40 1310 980 865 680

.50 1240 940 825 645

.60 1135 880 760 590

.70 1025 800 670 515

.75 975 750 610 465NOTE All cfm data is measured external to unit.CHA16(R)-411-413 BLOWER PREFORMANCE @ 230 VOLTS

(With DownFlow Supply and Return Air Openings)



0 1415 1350 1135 915

.05 1395 1335 1125 905

.10 1375 1315 1115 895

.15 1360 1290 1110 890

.20 1355 1275 1105 885

.25 1325 1255 1095 875

.30 1310 1235 1085 865

.40 1265 1195 1060 845

.50 1220 1155 1020 825

.60 1170 1105 975 785

.70 1115 1045 925 725


CHA16(R)-511-513 BLOWER PERFORMANCE @ 230 VOLTS(With DownFlow Supply and Return Air Openings)



0 2065 1715 1515 1305

.05 2055 1705 1505 1300

.10 2040 1690 1495 1300

.15 2020 1680 1485 1295

.20 2000 1665 1475 1290

.25 1975 1650 1470 1285

.30 1950 1635 1450 1280

.40 1885 1600 1425 1260

.50 1810 1565 1395 1225

.60 1730 1525 1360 1175

.70 1645 1600 1320 1110


CHA16-413 BLOWER PERFORMANCE @ 460/575 VOLTS(With Horizontal Supply and Return Air Openings)External Static Air Volume @ Various Speeds

Pressure (in. wg) High Medium Low

0 1710 1590 1105

.05 1685 1565 1105

10 1655 1535 1105

.15 1630 1510 1100

.20 1610 1490 1095

.25 1570 1470 1085

.30 1540 1445 1075

.40 1475 1385 1040

.50 1405 1330 1010

.60 1335 1260 960

.70 1240 1185 885

.75 1180 1150 825NOTE All cfm data is measured external to unit.

CHA16-513 BLOWER PERFORMANCE @ 460/575 VOLTS(With Horizontal Supply and Return Air Openings)External Static Air Volume @ Various Speeds


0 2160 1815 1210

.05 2125 1800 1210

.10 2095 1790 1200

.15 2060 1780 1200

.20 2025 1760 1195

.25 1990 1745 1190

.30 1955 1730 1185

.40 1885 1690 1170

.50 1805 1640 1140

.60 1715 1575 1105

.70 1615 1495 1065


CHA16-653 BLOWER PERFORMANCE @ 460/575 VOLTS(With Horizontal Supply and Return Air Openings)

External Static Air Volume @ Various Speeds


0 2850 2430 1940

.05 2805 2385 1920

.10 2760 2345 1905

.15 2715 2310 1885

.20 2670 2275 1870

.25 2640 2240 1850

.30 2605 2210 1825

.40 2515 2140 1775

.50 2445 2120 1710

.60 2355 1990 1600

.70 2270 1920 1590


CHA16-413 BLOWER PERFORMANCE @ 460/575 VOLTS(With DownFlow Supply and Return Air Openings)



0 1625 1465 1100

.05 1600 1445 1100

.10 1570 1420 1100

.15 1455 1395 1095

.20 1525 1385 1090

.25 1485 1365 1075

.30 1465 1340 1070

.40 1400 1285 1035

.50 1335 1235 1005

.60 1260 1165 955

.70 1170 1085 875





0 2140 1745 1175

.05 2120 1730 1175

.10 2080 1720 1170

.15 2045 1710 1170

.20 2005 1695 1165

.25 1975 1680 1160

.30 1940 1665 1150

.40 1870 1625 1135

.50 1790 1580 1110

.60 1705 1515 1075

.70 1615 1430 1030





0 2725 2405 1905.05 2680 2365 1890

.10 2635 2325 1870

.15 2590 2290 1855

.20 2550 2255 1840

.25 2515 2220 1820

.30 2485 2190 1795

.40 2395 2120 1745

.50 2325 2050 1680

.60 2235 1970 1570

.70 2150 1900 1560

.75 2100 1860 1515

NOTE All cfm data is measured external to unit.

CHA16(R)-651-653 BLOWER PERFORMANCE@ 230 VOLTS(With Horizontal Supply and Return Air Openings)


Pressure (in. wg) High MedHigh Med MedLow Low

0 2850 2530 2255 1970 1640.05 2820 2475 2230 1965 1645

.10 2790 2475 2205 1955 1645

.15 2760 2455 2180 1940 1630

.20 2725 2435 2160 1925 1610

.25 2680 2405 2150 1910 1600

.30 2630 2375 2135 1895 1585

.40 2570 2315 2080 1860 1560

.50 2510 2270 2025 1795 1525

.60 2410 2180 1960 1755 1475

.70 2335 2115 1900 1690 1425

.75 2300 2070 1865 1650 1390NOTE All cfm data is measured external to unit.

CHA16(R)-651-653 BLOWER PERFORMANCE@ 230 VOLTS(With DownFlow Supply and Return Air Openings)

External Static Air Volume (cfm) @ Various SpeedsPressure (in. wg) High MedHigh Med MedLow Low

0 2725 2490 2235 1940 1620.05 2695 2435 2210 1930 1625.10 2665 2430 2185 1925 1625.15 2635 2415 2160 1910 1610.20 2600 2395 2140 1895 1590.25 2555 2365 2130 1880 1580.30 2510 2335 2115 1865 1565.40 2445 2275 2060 1830 1540.50 2385 2230 2005 1765 1505.60 2285 2140 1940 1725 1455.70 2210 2075 1880 1660 1405.75 2175 2030 1845 1615 1370

NOTE All cfm data is measured external to unit.

FIGURE 1

CHA16H PARTS ARRANGEMENT

COMPRESSOR

DRAIN

CONTROLBOX

OPTIONALELECTRIC HEAT

SUPPLY

EVAPORATOR COIL

BLOWER

RETURN

CONTACTOR

CONDENSER FAN

CHA16410 AND CHA16510/650PARTS ARRANGEMENT

CONDENSERCOIL

COMPRESSOR

CONTROL BOX

OPTIONALELECTRIC HEAT

EVAPORATORCOIL

BLOWER

RETURN

OPTIONALSUPPLY

OPTIONALRETURN

SUPPLY

SUPPLY

IAPPLICATIONCHA16 25 ton units are available in three model andthree cabinet sizes (refer to the Engineering Handbookfor more specific application data). CHA16H modelsare available only in the smallest cabinet and are appli-cable for residential installations with horizontal sup-ply and discharge air only. CHA16H units are single-phase only and are not equipped for installation ofLennox optional thermostat control systems.CHA16R models are residential only units available inboth the small and large convertible (downflow or hor-izontal) cabinets. CHA16R models, like the CHA16Hmodels, are single-phase only and are not equippedfor installation of Lennox optional thermostat controlsystems. CHA16 models are residential or commercialunits available in single or three-phase and available inboth the small and large convertible (downflow or hor-izontal) cabinets. CHA16 models are factory equippedwith the hardware required for installing Lennox op-tional thermostat control systems. Lennox optionalthermostat control systems are the same controls, har-nesses, and harness plugs used in all 16 series com-

mercial air conditioners, heat pumps and gas/electrics.For example, a Honeywell W973 control will plug in toa CHA16411 as easily as it will plug in to aCHA161853 (and no field wiring is required for either).

IIUNIT COMPONENTS

CHA16 unit components are shown in figure 1.

AControl Box Components

CHA16H control box is shown in figure 2. The controlbox is located adjacent to the compressor compart-ment behind the electric heat access panel.

CHA16R411 and CHA16410 control box is shown infigures 3 and 4. CHA16R511/651 and CHA16510/650control box is shown in figures 5 and 6. In both units,the control box is located in the heating compartmentbehind the heating compartment access panel.

The indoor blower access panel (all units) is located onthe opposite side of the unit from the control box ac-cess. Figure 1 shows typical blower compartment ac-cess.

FIGURE 2

CHA16H CONTROL BOX

T1TRANSFORMER

K3BLOWER

RELAY

WIRINGGROMMET

C1CAPACITOR

C5CAPACITOR

K1CONTACTOR

ELECTRICHEAT SECTION

FIGURE 3

CHA16R411 CONTROL BOX COMPONENTS

WIRING GROMMET

T1TRANSFORMER

K3BLOWER RELAY

ELECTRICHEAT

SECTION

K1COMPRESSORCONTACTOR

C12DUAL

CAPACITOR

F1 FUSE

FIGURE 4

CHA16411/413 CONTROL BOX COMPONENTS

TB1TERMINAL BOARD

K3BLOWER RELAY

K1COMPRESSORCONTACTOR

T1TRANSFORMER

C12 DUAL CAPACITOR(-411 Units)

C1 FAN CAPACITOR(-413 UNITS)

T4AUTO TRANSFORMER(CHA164131J only)

WIRING GROMMET

ELECTRICHEAT SECTION

F1 FUSE

CHA16R511/651 CONTROL BOX

FIGURE 5

WIRING GROMMET

T1 TRANSFORMER

K31 POTENTIALRELAY

K3BLOWER RELAY

K1 COMPRESSORCONTACTOR

C12DUAL CAPACITOR

C7 STARTCAPACITOR

ELECTRIC HEATSECTION

F1 FUSE

FIGURE 7

BLUE

YELLOW

ORANGE

RED

BLACK

240 VOLTS

208 VOLTS

PRIMARY SECONDARY

208 / 230 VOLTTRANSFORMER

Page 11

CHA16511/513/651/653 CONTROL BOX

FIGURE 6

WIRINGGROMMET

T1TRANSFORMER

K31 POTENTIALRELAY

CHA16511/651 units only

C7 START CAPACITORCHA16511/651

units only

T4AUTO TRANSFORMER

(CHA16513/653575v only)

TB1 TERMINALBOARD

K3BLOWER RELAY

K1 COMPRESSORCONTACTOR

C12DUAL CAPACITOR

(CHA16511/651 only)

C1CAPACITOR

(CHA16513/653 only)

OR

LOCATION FORP AND Y VOLTAGE

LOCATION FORG AND J VOLTAGE

F1 FUSE

1Transformer T1

CHA16 series units use asingle line voltage to24VAC transformer locatedin the control box. Thetransformer supplies pow-er to control circuits in theunit. Transformers arerated as shown in table 1.P voltage (208/230V)transformers use two pri-mary voltage taps asshown in figure 7.

Unit

T1 TRANSFORMER RATING

Primary SecondaryVA

RatingInternal

Fuse

No Fuse4524VAC230VACCHA16H-261CHA16H-311CHA16R-411/511/651CHA16-411P/413YCHA16-511P/513YCHA16-651P/653Y

208/230VAC 24VAC 70 3.5A

CHA16-413G 24VAC480VAC 70 3.5ACHA16-513/653G 24VAC440VAC 48 2.5A

CHA16-413/513/653J 24VAC575VAC 70 3.5A

TABLE 1

2Terminal Strip TB1

All CHA16 commercial units are equipped with a lowvoltage terminal strip (TB1). The strip is used for mak-ing up all indoor thermostat and outdoor unit low volt-age control wiring connections (see figures 4 and 6).The terminal strip is located at the bottom left corner ofthe control box.

3Transformer Fuse F1

Transformers used in CHA16H and CHA16R units arenot equipped with internal secondary voltage overcur-rent protection. Transformers in all other units areequipped with an integral fuse connected in serieswith the blue secondary voltage wire. The fuse may beaccessed outside the transformer and is rated asshown in table 1.

4Cooling Contactor K1

K1 is a 24V to line voltage contactor used to energizethe compressor and condenser fan in response to ther-mostat demand. Three-phase units use three-pole-double-break contactors. Single-phase units usesingle-pole contactors.

WARNINGElectric shock hazard.

Can cause injury or death.

Single-phase units are equippedwith single-pole contactors. Oneleg of compressor, capacitor andcondenser fan are always con-nected to line voltage. Turn offpower at disconnect before serv-icing.

NOTEContactor K1 is energized by the thermostatcontrol system. Depending on the control systeminstalled, the contactors may or may not be im-mediately energized upon demand. Refer to the op-eration sequence for the control system installed.

FIGURE 8

AUTOTRANSFORMER T4CHA164131J ONLY

RE

D

BLA

CK

BR

OW

N

575V

460V

Page 12

5Autotransformer T4

CHA16413 (575V) unitsuse a line voltage to 460Vautotransformer to powerthe indoor blower. Theautotransformer is con-nected directly to linevoltage and is powered atall times. It has a maxi-mum VA rating of 3.4A.See figure 8.

6Indoor Blower Relay K3 (Cooling Speed)

208/230 volt units use a single 2PDT relay to energizethe indoor blower motor. 460 volt and 575 volt unitsuse a single 3PDT relay. The relay coil is energized byblower demand from indoor thermostat terminal G(cooling demand or fan switch in ON position).When the coil is energized, a set of N.O. contacts closesto energize the blower motor on high speed. Whenthere is a demand for heat, the blower is energized bythe blower relay located inside the electric heat sectionof the unit.

460 (G) and 575(J) voltage units use a unique blowermotor. The motor utilizes a set of N.C. relay contacts(K3) to complete an internal circuit when the motor ison low or medium (heating) speed.

7Potential Relay K31

Relay K31 is used in single-phase 511 and 651 unitsonly and is located in the control box. It is a potentialrelay which controls the operation of the starting cir-cuit. The relay is normally closed when the compres-sor (contactor K1) is deenergized. Capacitor (C7) isconnected to a set of N.C. K31 contacts and is used toassist the compressor in starting. When K1 energizes,the compressor immediately begins startup. K31 re-mains deenergized during compressor startup andthe start capacitor (C7) remains in the circuit. As thecompressor gains speed K31 is energized by electro-motive forces generated by the compressor. When K31energizes, its contacts open to take the start capacitorout of the circuit.

8Start Capacitor C7

Unit C7 Start Capacitor RatingCHA16-511CHA16R-511CHA16-651CHA16R-651

135 - 155 MFD.@ 320 VAC

176 - 216 MFD.@ 320 VAC

TABLE 2Start Capacitor Ratings

All single-phase units (size 511 and larger) use a com-pressor start capacitor (C7) connected in parallel withthe compressor side of dual capacitor C12. The start ca-pacitor is energized during compressor startup and isswitched off by potential relay K31 when the compres-sor nears full speed. Three-phase units do not use startcapacitors. Table 2 shows start capacitor ratings forsingle-phase CHA16s. The capacitor is mounted in theunit control box. See figures 5 and 6 for capacitor loca-tion.

NOTE Before servicing unit, be sure to identify thecompressor and fan sides of dual capacitor C12.

The start capacitor uses a 15K ohm 2 watt bleed re-sistor connected in parallel with the capacitor termi-nals. A resistor is used to slowly discharge the capaci-tor when not in use.

9Dual Capacitor C12

CHA16 and CHA16R three, four and five ton single-phase units use permanent split capacitor (PSC) mo-tors in both compressor and condenser fan. A singledual capacitor is used for both. A dual capacitor istwo independent capacitors inside one can. The fanside of the capacitor and the compressor side of the ca-pacitor have different ratings. The capacitor is locatedinside the compressor compartment. Refer to table 3.See figures 3, 4, 5 and 6 for location.

UnitKey

NumberType/Rating

Run Capacitor Ratings

CHA16-511CHA16R-511 C12

Dual Capacitor40 mfd compressor7.5 mfd fan@ 440V

CHA16-651CHA16R-651 C12

Dual Capacitor45 mfd compressor7.5 mfd fan@ 440V

CHA16-411CHA16R-411 C12

Dual Capacitor40 mfd compressor5 mfd fan@ 370V

CHA16H-261CHA16H-311CHA16-413Y

C1Single Capacitor5 mfd fan@ 370V

CHA16-413G/413JCHA16-513Y/513G/513JCHA16-653Y/653G/653J

C1Single Capacitor7 mfd fan@ 370V

TABLE 3

CHA16H-311 C5Single Capacitor35 mfd compressor@ 370V

CHA16H-261 C5Single Capacitor30 mfd compressor@ 370V

10Compressor Run Capacitor C5

All single-phase units use permanent-split-capacitorcompressor motors which require run capacitors tomaximize compressor efficiency. Three ton and largerunits use the compressor side of dual capacitor C12while units smaller than three tons use a single run ca-pacitor C5. Table 3 shows C5 run capacitors used inCHA16 single-phase units. Three-phase units do notuse run capacitors. See figures 2 through 6 for capaci-tor location.

11Fan Capacitor C1

All three-phase CHA16 units use single-phase PSCcondenser fan motors. Motors are equipped with afan run capacitor to maximize motor efficiency. Thefan capacitor is located in the compressor compart-ment and is electrically connected as shown in the unitwiring diagram. Capacitor ratings are shown intable 3.

In some single phase units, the fan capacitor is com-bined with the compressor run capacitor in C12. Referto dual capacitor C12.

BCooling Components

Summary of Features

All units use DX cooling. Cooling in commercial units(CHA16) may also be supplemented by field-installedeconomizer. CHA16H261/311, CHA16411/413 andCHA16R411 units use a single slabtype enhanced finevaporator with rifled tubing and capillary cap tubesas the primary expansion device (figure 10).CHA16R511/651 and CHA16511/513/651/653 unitsuse a single slabtype enhanced fin evaporator withrifled tubing and a thermal expansion valve TXV asthe primary expansion device (figure 9). CHA16R andCHA16H series units are not equipped with crankcaseheater, high pressure switch or loss of charge switch.All 510/650 units are equipped with thermometerwell for charging. All models use drawthrough typecondenser fans.

PLUMBING COMPONENTSTHERMAL EXPANSION VALVE SYSTEMS

FIGURE 9

HIGH PRESSURE AND LOSS OF CHARGE SWITCHES USED ON CHA16 UNITS ONLY.

CONDENSER COIL

EVAPORATORCOIL

COMPRESSOR TERMINAL BOX

EXPANSION VALVELIQUID LINE

DISCHARGE LINEHIGH PRESSURE SWITCH

(CHA16 only)

LOSS OF CHARGE SWITCH(CHA16 only)

THERMOMETERWELL and LIQUID

GAUGE PORT

CHA16(R)510/650

LIQUID LINE GAUGE PORT

SUCTION LINEGAUGE PORT

CHA16-650


CHA16-510

FIGURE 10

PLUMBING COMPONENTS CAPILLARY TUBE SYSTEMS

CHA16H261

CHA16H311

SUCTION LINE


CONDENSER COIL

CONDENSER COIL

EVAPORATOR COIL

EVAPORATOR COIL

CAPILLARY TUBES

CAPILLARY TUBES


LIQUID LINE

DISCHARGE LINE

DISCHARGE LINE


LIQUID LINE

LIQUID LINEGAUGE PORT


SUCTION LINEGAUGE PORT SUCTION

LINE

HIGH PRESSURE SWITCH(CHA16 only)

CONDENSER COIL

EVAPORATOR COIL

LIQUID LINE

COMPRESSORTERMINAL BOX

SUCTION LINE

LOSS OF CHARGE SWITCH(CHA16 only)

CHA16(R)410



DISCHARGE LINE

TABLE 4

UnitLockedRotorAmps

RatedLoadAmps

OilChargeFl. Oz.

Oil TypeViscosityCrankcase

HeaterPhase

CHA16 SERIES UNITS COMPRESSOR SPECIFICATIONS

CHA16H261

CHA16H311

Voltage/

CHA16R411

CHA16411CHA164131Y

CHA16413

208/230/1

208/230/1208/230/1

208/230/1

575/3CHA16R511

CHA16511

208/230/3

208/230/1

208/230/1CHA16513

CHA16513CHA16513

208/230/3

460/3575/3

CHA16R651

CHA16651CHA16653

CHA16653

CHA16653

208/230/1

208/230/1208/230/3

460/3

575/3

57.0

77.483.5

83.566.0

35.0118.0

118.090.0

45.036.0

135.0

135.0105.0

55.0

45.0

40

4055

5555

5555

5555

555570

7070

70

70

190210

190210

190210

**Heat Pump Grade Mineral*Texaco Capella WF32 or Suniso 3GS or White Oil M/M Sontex 200LT

None

40 watt InsertionType Self

Regulating

None


Regulating

None


Regulating*

***Not Specified

**

***

**

**

12.1

13.517.6

17.611.5

5.323.4

23.415.4

8.46.527.6

27.617.7

9.4

6.3

***

*** ***

******


Regulating

1Compressor B1

Table 4 shows the specifications of compressors usedin all units. Compressors used in CHA16 commercialunits are equipped with insertion type crankcase heat-ers. All compressors are protected by internal pressurerelief valves and internal overload protection circuitry.

WARNINGElectric Shock Hazard.


Do not operate without protec-tive cover over terminals. Discon-nect power before removing pro-tective cover. Discharge capaci-tors before servicing unit.

2High Pressure Limit S4

The high pressure limit is a manually reset SPST N.C.switch which opens on a pressure rise. All commercialunits (CHA16) are equipped with the limit. CHA16R andCHA16H are not equipped with the limit. The switch islocated in the compressor discharge line and is wiredin series with the compressor contactor. When dis-charge pressure rises above 410+10 psig (indicating aproblem in the system) the switch opens and the com-

pressor is deenergized ( the economizer can continueto operate.) After the problem has been found and cor-rected, the switch can be reset by pushing the resetbutton.

3Loss of Charge Switch S24

The loss of charge switch is an auto-reset SPST N.C.switch which opens on a pressure drop. All commer-cial units (CHA16) are equipped with the switch.CHA16R and CHA16H are not equipped with theswitch. The switch is located in the compressor dis-charge line and is wired in series with the high pres-sure switch and compressor contactor. When dis-charge pressure drops below 25+5 psig (indicating aloss of charge in the system) the switch opens and thecompressor is deenergized. The switch automaticallyresets when refrigerant is added and discharge linepressure rises above 55+5 psig.

4Condenser Coil

All CHA16s have a single condenser coil. Each coil hastwo rows (CHA16511/513 and CHA16R511 have11/2 rows) of copper tubes fitted with rippleedgedaluminum enhanced fins.

5Evaporator Coil

All CHA16s have a single slab evaporator coil. The coilhas two rows of rifled copper tubes fitted with rippleedged aluminum fins. An expansion device feeds mul-tiple parallel circuits through the coil.

EVAPORATOR PLUMBINGCHA16H261, CHA16H311,

CHA16411/413 and CHA16R411

LIQUID LINE

SUCTION LINE

EVAPORATOR

CAP TUBES

CAPILLARY TUBEEXPANSION DEVICE

FIGURE 11

CAP TUBES

CAPILLARY TUBEEXPANSION DEVICE

SUCTION LINE

EVAPORATOR

EVAPORATOR

aCapillary Tube SystemsCHA16H261, CHA16H311, CHA16411/413 andCHA16R411 units use capillary tubes as the prima-ry expansion device in the indoor coil. Multiple captubes feed independent parallel circuits throughthe coil. Expansion takes place at the point wherethe cap tubes enter the coil. See figure 11.

EVAPORATOR PLUMBINGCHA16511/513, CHA16651/653CHA16R511 and CHA16R651

EVAPORATOR

EXPANSIONVALVE FED BYLIQUID LINE

SUCTIONLINE

SENSINGBULB STRAPPED

TO SUCTION LINE

FEEDER TUBES

FIGURE 12

LIQUID LINE

EQUALIZERLINE

FEEDERTUBES

FIGURE 13

THERMOMETER WELL

THERMOMETERWELL

LIQUID LINEGAUGE PORTLIQUID LINE

Page 17

bExpansion ValveCHA16 510 through 650 series units use a Ther-mal Expansion Valve (TXV) as the primary expan-sion device. See figure 12.

6Thermometer Well (Figure 13)

All CHA16510/650 seriesunits are factory equippedwith a thermometer wellfor charging the unit. Thewell is used to accuratelymeasure the temperatureof the liquid line. The tem-perature measured is thenused to calculate the ap-proach or subcooling tem-perature. Approach andsubcooling temperatures are compared to tablesprinted in the charging section of this manual to deter-mine the correct charge. Thermometer wells areequipped with a gauge port for connection of highpressure gauge.

To accurately measure the temperature of the liquidline, the well should be filled with a light mineral oil be-fore using. This will ensure good heat transfer to thethermometer.

CFan and Blower

1Condenser Fan and Motor B4

The table on pages 2, 3 and 4 in this manual show thespecifications of condenser fans used in CHA16s. Thecondenser fan in all units is controlled by cooling con-tactor K1. The condenser fan can be accessed by re-moving the fan grill located on top of the unit.

2Condenser Fan Motor Capacitor C1

All CHA16s use single-phase PSC condenser fan mo-tors. Table 5 shows fan run capacitor ratings forCHA16s.

TABLE 5CONDENSER FAN MOTOR CAPACITOR

Unit & Unit Voltage

CHA16H261 7 370CHA16H311

Type MFD @ Volts

SingleSingle

CHA16411CHA16R411

Dual (shared withcompressor)

7 370

5 370

CHA16413 Single 5 370

208/230208/230

208/230

208/230

CHA16511/651CHA16R511/651208/230 Single 7 370

CHA16413/513/653 ALL Single 7 370

3Blower Motor B3

All CHA16 series units use single-phase PSC blowermotors. A single run capacitor is mounted on the blow-er housing. All motors use multiple speed taps. Typi-cally, the high speed tap is energized during compres-sor operation and a lower speed tap is energized dur-ing heating operation.

Blower motors in CHA16 261, 311, 411 and 511units have four speed taps. Motors in CHA16651 unitshave five speed taps. All 460 voltage units have threetaps. Blower motor specifications are listed in table 6.Blower performance ratings are listed in the tables onpages 6, 7 and 8.

TABLE 6BLOWER MOTOR 1075 RPM CCW ROTATION

Unit Volts Phase HP FLA

CHA16H261

CHA16H311

CHA16411/413 CHA16R411

CHA16511/513 CHA16R511

CHA16513

CHA16651/653 CHA16R651

CHA16653

208/230

208/230

208/230

208/230

208/230

460

460

1

1

1

1

1

1

1

1/3

1/3

1/3

1/2

3/4

3/4

3/4

2.1

2.1

3.9

3.9

1.8

4.6

1.8

Motor

575

CHA16413 460 1 1/2 1.8

CHA16513 575 1 3/4 0.7

CHA16653 1 3/4 0.7

A third (blue) tap on G (460V) and J (575V) volt motorsis used to complete an internal circuit during low ormedium speed operation. It must never be connectedto line voltage. During low speed (red tap) operation,the high speed (black) tap is disconnected from linevoltage and is connected to blue internal wiring tap.Internal wiring is shown in figure 14.

FIGURE 14

ORANGE BLACK BLUE YELLOW RED

WINDING WINDING WINDINGHIGH SPEED MEDIUM SPEED LOW SPEED

460 VOLT BLOWER MOTOR WINDINGS

The motor has three sets of windings. The high speed winding isindependent of the other two and the medium and low speedwindings are tied together with a center tap. High speed is ac-complished by energizing the high speed windings. Mediumspeed is accomplished by connecting the medium speed andhigh speed windings in series. Low speed is accomplished byconnecting the low, medium and high speed windings in series.Refer to unit wiring diagram and Corp. 8909L7.

CAUTIONPotential for damage to 460V and 575V blowermotors and/or unit electrical circuits.

The blue blower motor lead must never be con-nected to a line voltage power lead (blower de-mand from heat relay or blower relay). Refer tounit wiring diagram for proper wiring.

Can result in improper operation, increased cur-rent flow and/or burnt windings.

4Indoor Blower Motor Capacitor C4

All CHA16 208/230v units use single-phase PSC mo-tors. A run capacitor is mounted on the blower hous-ing. Capacitor ratings are shown in table 7.

460v and 575v units use single-phase PSC 460v blowermotors. A run capacitor is located on the blower hous-ing.

TABLE 7Unit 208/230v Blower Capacitor Rating

CHA16H261/311

CHA16411P/413Y CHA16R411

CHA16511P/513Y CHA16R411

7 MFD at 370 V

10 MFD at 370 V

20 MFD at 370 V

CHA16651P/653Y CHA16R411 20 MFD at 370 VCHA16413G,J 10 MFD at 370 V

CHA16513G,J 10 MFD at 370 V

CHA16653G,J 20 MFD at 370 V

IIIOPTIONAL ECH16 ELECTRIC HEAT

AMatchups and Ratings

Tables 8, 9, 10, 11 and 12 show all possible CHA16 toECH16 matchups. Also shown in the tables are ECH16electrical ratings.

BElectric Heat Components

ECH16 parts arrangement is shown in figures 15, 16,17, 18, 19, 20 and 21. All ECH16 units consist of electricheating elements exposed directly to the airstream.Elements are sequenced on and off by heat relays orcontactors in response to thermostat demand.

1Relay K15Relay K15 is a single-pole single-throw relay lo-cated on the control panel of all commercial single-phase ECH16 units (15, 20 and 25 kW). K15 isequipped with a 24VAC coil which is energized

when pilot relay K43 closes. When K15 is energized,the first stage heating elements are energized.(HE1 in ECH16-15; HE1 and HE2 in ECH16-20 andECH16-25).

2Contactor K15

Contactor K15 is a three-pole double break contac-tor used in all commercial three-phase ECH16units. K15 is equipped with a 24VAC coil which isenergized when pilot relay K43 closes. When K15 isenergized, the first stage heating elements are en-ergized.

Contactor K15 used in ECH16-15-1Y andECH16-25-1G units is equipped with a set of auxilia-ry single-pole double-throw contacts. The auxiliarycontacts are not used in this application.

3Relay K16

Relay K16 is a single-pole single-throw relay lo-cated on the control panel of all commercial single-phase ECH16 units (15, 20 and 25 kW). K16 isequipped with a 24VAC coil which is energizedwhen pilot relay K43 closes. When K16 is energized,the second stage heating elements are energized(HE2 in ECH16-15; HE3 and HE4 in ECH16-20 andECH16-25).

4Contactor K16

Contactor K16 is a three-pole double break contac-tor used in commercial 20 and 25 kW three-phaseECH16 units. K16 is equipped with a 24VAC coilwhich is energized when time delay DL2 closes.When K16 is energized, the second stage heatingelements are energized.

5Relay K17

Relay K17 is a single-pole single-throw relay lo-cated on the control panel of all commercial single-phase ECH16 units (15, 20 and 25 kW). K17 isequipped with a 24VAC coil which is energizedwhen pilot relay K43 closes. When K17 is energized,the third stage heating elements are energized(HE3 in ECH16-15; HE5 and HE6 in ECH16-20 andECH16-25).

TABLE 8

CHA16-261 & CHA16-311 ELECTRIC HEAT DATA

Optional Single Point Power Source Boxes

SinglePackage

UnitModel No.

ElectricHeater

Model No.& Net Weight

No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input

ElectricHeatBtuhInput

Heater Sub-Fuse Box

Model No.

Unit Sub-Fuse Box

Model No.

Total Unit &Electric Heat*Minimum

CircuitAmpacity

208 22.5 3.7 12,600 25.1

ECH16R-5 1 step 220 23.9 4.2 14,300 ECH16R- ECH16-261 26.5

(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41-5 27.5

240 26.0 5.0 17,100 28.6

208 31.6 5.3 18,100 34.3


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65-7 37.6

CHA16H-261 240 36.5 7.0 23,900 39.1

208 45.1 7.5 25,600 47.8


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65-10 52.6

240 52.1 10.0 34,100 54.8

208 67.8 11.3 38,600 70.4

ECH16-15 1 step 220 71.6 12.6 43,000 - - - - ECH16-261 74.3

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 77.5

240 78.1 15.0 51,200 80.8

208 22.5 3.7 12,600 25.1


(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41-5 27.5

240 26.0 5.0 17,100 28.6

208 31.6 5.3 18,100 34.3


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65-7 37.6

CHA16-311 240 36.5 7.0 23,900 39.1

208 45.1 7.5 25,600 47.8

ECH16RR-10 1 step 220 47.8 8.4 28,700 ECH16R- ECH16-311 50.4

(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65-10 52.6

240 52.1 10.0 34,100 54.8

208 67.8 11.3 38,600 70.4

ECH16-15 1 step 220 71.6 12.6 43,000 - - - - ECH16-311 74.3

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 77.5

240 78.1 15.0 51,200 80.8*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.

TABLE 9CHA16(R)-411-413 ELECTRIC HEAT DATA


SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input


Heater Sub-Fuse Box

Model No.

Unit Sub-Fuse Box

Model No.

Total Unit &Electric Heat

*Minimum CircuitAmpacity

208 22.5 3.7 12,600 26.3ECH16R-5 1 step 220 23.9 4.2 14,300 ECH16R- ECH16-411 27.6

(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41-5 28.6240 26.0 5.0 17,100 29.8208 31.6 5.3 18,100 35.4

ECH16R-7 1 step 220 33.5 5.9 20,100 ECH16R- ECH16-411 37.3(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65-7 38.8

240 36.5 7.0 23,900 40.3208 45.1 7.5 25,600 48.9

ECH16R-10 1 step 220 47.8 8.4 28,700 ECH16R- ECH16-411 51.5CHA16-411 (5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65-10 53.8

CHA16R-411 240 52.1 10.0 34,100 55.9208 67.8 11.3 38,600 71.5

ECH16-15 1 step 220 71.6 12.6 43,000 - - - - ECH16-411 75.4(18 lbs.) (1 phase) 230 74.9 13.8 47,100 78.6

240 78.1 15.0 51,200 81.9208 90.3 15.0 51,200 94.0


240 104.1 20.0 68,300 107.9208 13.0 3.7 12,600 16.8


240 15.0 5.0 17,100 18.8208 18.3 5.3 18,100 22.0220 19.3 5.9 20,100 - - - - ECH16-413 23.0230 20.1 6.4 21,800 23.9

ECH16-7 1 step 240 21.0 7.0 23,900 24.8(17 lbs.) (3 phase) 440 9.6 5.8 19,800 11.9

460 10.1 6.5 22,200 - - - - ECH16-413 12.4480 10.5 7.0 23,900 12.8208 26.1 7.5 25,600 29.9220 27.6 8.4 28,700 - - - - ECH16-413 31.4230 28.9 9.2 31,400 32.6

CHA16-413 ECH16-10 1 step 240 30.1 10.0 34,100 33.9(17 lbs.) (3 phase) 440 13.8 8.4 28,700 16.0

460 14.4 9.2 31,400 - - - - ECH16-413 16.6480 15.0 10.0 34,100 17.3208 39.1 11.3 38,600 42.9220 41.4 12.6 43,000 - - - - ECH16-413 45.1230 43.2 13.8 47,100 47.0

ECH16-15 1 step 240 45.1 15.0 51,200 48.9(20 lbs.) (3 phase) 440 20.6 12.6 43,000 22.9

460 21.6 13.8 47,100 - - - - ECH16-413 23.9480 22.5 15.0 51,200 24.8208 52.1 15.0 51,200 55.9220 55.1 16.8 57,300 - - - - ECH16-413 58.9230 57.6 18.4 62,800 61.4

ECH16-20 2 steps 240 60.1 20.0 68,300 63.9(20 lbs.) (3 phase) 440 27.6 16.8 57,300 29.9

460 28.9 18.4 62,800 - - - - ECH16-413 31.1480 30.1 20.0 68,300 32.4

*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.

TABLE 10CHA16(R)-511/651 ELECTRIC HEAT DATA


SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input


Heater Sub-Fuse Box

Model No.

Unit Sub-Fuse Box

Model No.


CircuitAmpacity

208 31.6 5.3 18,100 36.5


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65-7 39.9

240 36.5 7.0 23,900 41.4

208 45.1 7.5 25,600 50.0


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65-10 54.9

240 52.1 10.0 34,100 57.0

CHA16-511 208 67.8 11.3 38,600 72.6

CHA16R-511 ECH16R-15 1 step 220 71.6 12.6 43,000 - - - - ECH16-511 76.5

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 79.8

240 78.1 15.0 51,200 83.0

208 90.3 15.0 51,200 95.1

ECH16-20 1 step 220 95.5 16.8 57,300 - - - - ECH16-511 100.4

(19 lbs.) (1 phase) 230 99.8 18.4 62,800 104.6

240 104.1 20.0 68,300 109.0

208 112.9 18.8 64,200 117.8

ECH16-25 1 step 220 119.4 21.0 71,700 - - - - ECH16-511 124.3

(19 lbs.) (1 phase) 230 124.9 23.0 78,500 129.8

240 130.3 25.0 85,300 135.1

208 31.6 5.3 18,100 37.4


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65-7 40.8

240 36.5 7.0 23,900 42.3

208 45.1 7.5 25,600 50.9


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65-10 58.3

240 52.1 10.0 34,100 57.9

CHA16-651 208 67.8 11.3 38,600 73.5

CHA16R-651 ECH16R-15 1 step 220 71.6 12.6 43,000 - - - - ECH16-651 77.4

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 80.6

240 78.1 15.0 51,200 83.9

208 90.3 15.0 51,200 96.0

ECH16-20 1 step 220 95.5 16.8 57,300 - - - - ECH16-651 101.3

(19 lbs.) (1 phase) 230 99.8 18.4 62,800 105.5

240 104.1 20.0 68,300 109.9

208 112.9 18.8 64,200 118.6

ECH16-25 1 step 220 119.4 21.0 71,700 - - - - ECH16-651 125.1

(19 lbs.) (1 phase) 230 124.9 23.0 78,500 130.6

240 130.3 25.0 85,300 136.0*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.

TABLE 11CHA16-513 ELECTRIC HEAT DATA

Optional Single Point Power Source

SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input


Unit Sub-Fuse Box

Model No.


CircuitAmpacity

208 18.3 5.3 18,100 23.1220 19.3 5.9 20,100 ECH16-513 24.1230 20.1 6.4 21,800 25.0240 21.0 7.0 23,900 25.9

ECH16-7 1 step 440 9.6 5.8 19,800 11.9(17 lbs.) (3 phase) 460 10.1 6.5 22,200 ECH16-513/653 12.4

480 10.5 7.0 23,900 12.8

550 7.6 5.8 19,800 9.9575 8.0 6.4 21,800 ECH16-413/513 10.3600 8.4 7.0 23,900 10.6

208 26.1 7.5 25,600 31.0220 27.6 8.4 28,700 ECH16-513 32.5230 28.9 9.2 31,400 33.8240 30.1 10.0 34,100 35.0


480 15.0 10.0 34,100 17.3

550 11.0 8.4 28,700 13.3575 11.5 9.2 31,400 ECH16-413/513 13.8600 12.0 10.0 34,100 14.3

208 39.1 11.3 38,600 44.0220 41.4 12.6 43,000 ECH16-513 46.3230 43.2 13.8 47,100 48.1

CHA16-513 240 45.1 15.0 51,200 50.0


480 22.5 15.0 51,200 24.8

550 16.5 12.6 43,000 18.8575 17.3 13.7 46,800 ECH16-413/513 19.5600 18.0 15.0 51,200 20.3

208 52.1 15.0 51,200 57.0220 55.1 16.8 57,300 ECH16-513 60.0230 57.6 18.4 62,800 62.5240 60.1 20.0 68,300 65.0


480 30.1 20.0 68,300 32.4

550 22.0 16.8 57,300 24.3575 23.0 18.3 62,400 ECH16-413/513 25.3600 24.0 20.0 68,300 26.3

208 65.1 18.8 64,200 70.0220 68.9 21.0 71,700 ECH16-513 73.8230 72.0 22.9 78,100 76.9240 75.1 25.0 85,300 80.0

ECH16-25 2 steps 440 34.5 21.0 71,700 36.8(20 lbs.) (3 phase) 460 36.0 22.9 78,100 ECH16-513/653 38.3

480 37.6 25.0 85,300 39.9

550 27.6 21.1 72,000 29.9575 28.9 23.0 78,500 ECH16-413/513 31.1600 30.1 25.0 85,300 32.4


TABLE 12CHA16-653 ELECTRIC HEAT DATA

Optional Single Point Power Source

SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input


Unit Sub-Fuse Box

Model No.


CircuitAmpacity

208 18.3 5.3 18,100 24.0220 19.3 5.9 20,100 ECH16-653 25.0230 20.1 6.4 21,800 25.9240 21.0 7.0 23,900 26.8


480 10.5 7.0 23,900 12.8

550 7.6 5.8 19,800 9.9575 8.0 6.4 21,800 ECH16-653 10.3600 8.4 7.0 23,900 10.6

208 26.1 7.5 25,600 31.9220 27.6 8.4 28,700 ECH16-513 33.4230 28.9 9.2 31,400 34.6240 30.1 10.0 34,100 35.9


480 15.0 10.0 34,100 17.3

550 11.0 8.4 28,700 13.3575 11.5 9.2 31,400 ECH16-653 13.8600 12.0 10.0 34,100 14.3

208 39.1 11.3 38,600 44.9220 41.4 12.6 43,000 ECH16-653 47.1230 43.2 13.8 47,100 49.0

CHA16-653 240 45.1 15.0 51,200 50.9


480 22.5 15.0 51,200 24.8

550 16.5 12.6 43,000 18.8575 17.3 13.8 46,800 ECH16-653 19.5600 18.0 15.0 51,200 20.3

208 52.1 15.0 51,200 57.9220 55.1 16.8 57,300 ECH16-513 60.9230 57.6 18.4 62,800 63.4240 60.1 20.0 68,300 65.9


480 30.1 20.0 68,300 32.4

550 22.0 16.8 57,300 24.3575 23.0 18.3 62,400 ECH16-653 25.3600 24.0 20.0 68,300 26.3

208 65.1 18.8 64,200 70.9220 68.9 21.0 71,700 ECH16-653 74.6230 72.0 22.9 78,100 77.8240 75.1 25.0 85,300 80.9

ECH16-25 2 steps 440 34.5 21.0 71,700 36.8(20 lbs.) (3 phase) 460 36.0 22.9 78,100 ECH16-513/653 38.3

480 37.6 25.0 85,300 39.9

550 27.6 21.1 72,000 29.9575 28.9 23.0 78,500 ECH16-653 31.1600 30.1 25.0 85,300 32.4


PARTS ARRANGEMENT ECH16R-5/7/10-P

S15 S15 S15Primary Limit S15

Thermal(Heat)

Relay K32

Secondary Limit F5

Primary Limit S15

Thermal(Heat)

Relay K32

Thermal(Heat)

Relay K33

Secondary Limit F5

FIGURE 15

5Kw 7/10Kw

PARTS ARRANGEMENT ECH1615P

S15

K17 K16 K15K43

S20

S20

S20

35A FUSE

60A FUSE

Primary Limit S15

Secondary Limit S20

FIGURE 16

Electric Heat Relay K15



Pilot Relay K43

Current Limiting Fuses F3


K17 K16 K15K43

S15

S15S20

S20

S20

PARTS ARRANGEMENT ECH1620/25P

Primary Limit S15

Secondary Limit S20

FIGURE 17




Pilot Relay K43



PARTS ARRANGEMENT ECH165/15Y and ECH165/15G,J

K15

K43S15

S15S20

S20

S20

Primary Limit S15

Secondary Limit S20

FIGURE 18

Electric Heat Contactor K15

Pilot Relay K43


PARTS ARRANGEMENT ECH1620Y

K15K43

K16

S15

S15

S20S20

S20 S20

DL2

Primary Limit S15

Secondary Limits S20

FIGURE 19

First StageElectric Heat Contactor K15

Pilot Relay K43


Second StageElectric Heat Contactor K16


Second Stage Delay DL2

K15K43

K16

DL2

S15

S15S20

S20 S20

S20 S20

60A FUSE

40A FUSE

PARTS ARRANGEMENT ECH1625Y

Primary Limit S15


First StageElectric Heat Contactor K15

Pilot Relay K43

First StageCurrent Limiting Fuses F3

Second StageElectric Heat Contactor K16

Second StageCurrent Limiting Fuses F3

Second Stage Delay DL2

FIGURE 20

FIGURE 22

TYPICALTHERMAL SEQUENCING

(HEAT) RELAY

M1

M2

H

H

Page 27

K15

K43S15

S20S20

S20 S20

PARTS ARRANGEMENT ECH1620/25G,J

Primary Limit S15


Electric Heat Contactor K15

Pilot Relay K43


FIGURE 21

6Thermal (Heat) Relay K32, K33Thermal sequencing (heat) relays are used to ener-gize heating elements in ECH16R electric heaters.A heat relay is a normally open relay with a resistiveelement for a coil and a bimetal disc actuating thecontacts. When the relay is energized, internal re-sistance heats the bimetal disk causing the con-tacts to close. When the relay is de-energized, thedisk cools and the contacts open.

A sequencing relayhas multiple contacts.Each set of contacts isconnected to a sepa-rate bimetal disk.When the relay is en-ergized, internal resis-tance heats the bimet-al disks at differentrates causing the con-tacts to close at differ-ent times. The con-tacts are calibrated to operate on a first on last offbasis. Some heat relays may have two resistivecoils; each with its own set of contacts. Althoughthey are physically attached, they operate as twoindependent relays. Figure 22 shows a typical heatrelay. Table 13 describes the heat relays used inECH16 series units.

ECH16 Usage*Relay / OperationK32 K33

TWO TIMINGSCONTROL VOLTAGE COIL

24VAC coil. Both sets of con-tacts close 1-110 after H-H isenergized and open 1-110 sec.after H-H is de-energized. Ter-minals M1-M2 operate on afirst on last off basis.

ECH16R-5-PH H

M2

M4

M1

M3

TABLE 13

----

FOUR TIMINGSCONTROL VOLTAGE COIL

Acts as two independent con-trols. 24VAC coil. K32 controlsM1-M2 and M3-M4 contacts.K33 controls M5-M6 andM7-M8 contacts. Contactsclose 1-110 after H-H is ener-gized and open 1-110 sec. afterH-H is de-energized. All con-tacts operate on a first on lastoff basis.

ECH16R-7-P

H H

M2

M4

M1

M3

H H

M2

M4

M1

M3ECH16R-7-P

ECH16R-10-P ECH16R-10-P

THERMAL (HEAT) RELAYS

7Resistor R6A resistor is used in parallel with the coil of heatrelay K32 in ECH16R-5 electric heaters. The resistoris rated 150 ohm + 10%, 10 watt.

The resistor reduces the effects of inrush current onthe thermostat. Heat relay K32 draws approximate-ly 0.7 amps immediately after being energized. Asthe relay coil heats, the current subsides. Within afew seconds after being energized, the current is re-duced to minimum level (approximately 0.18amps).

Contactor K16 used in ECH16-25-1Y unit isequipped with a set of auxiliary single-pole double-throw contacts. The auxiliary contacts are not usedin this application.

8Relay K43Relay K43 is a double-pole double throw pilot relayused in all commercial ECH16 units. The relay usesa 24VAC coil which is energized by thermostat de-mand. The coil is wired in series with the primaryhigh temperature limit S15. If an overtemperaturecondition exists, pilot relay K43 is immediately de-energized and electric heat operation immediatelystops.

When relay K43 is energized, normally open con-tacts K43-1 and K43-2 close. When K43-1 closes,contactor K15 (and time delay DL2 if so equipped)are energized to begin electric heat operation.When K43-2 closes, the indoor blower begins oper-ating on heating speed.

9Time Delay DL2Time delay DL2 is an electronic single-pole single-throw time delay relay used in commercial 20 and25 kW three-phase ECH16 units. DL2 allows stagingby providing a timed interval between the first andsecond sets of heating elements. DL2 is energizedwith contactor K15 when pilot relay K43-1 closes.When the delay coil is energized, its normally opencontacts are delayed 30 seconds (+20%) beforeclosing. When the delay coil is de-energized, itscontacts are delayed one second (+20%) beforeopening.

10Fuse F3

F3 is a current limiting fuse connected in series with

each leg of electric heat. Fuses used in ECH16 series

units are shown in table 14.

ECH16 FUSE RATINGS

All fuses are dual element U.L. Class RK-5.

Unit Fuse F3 Usage

ECH16-15-1P60.0A @ 250V HE(2) & HE(3)

HE=Heating Element

35.0A @ 250V HE(1)

Quantity

TwoTwo

ECH16-20-1P 45.0A @ 250V Six HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)

Six HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)60.0A @ 250VECH16-25-1P

Three HE(1), HE(2), HE(3)20.0A @ 250VECH16-5-1YThree HE(1), HE(2), HE(3)25.0A @ 250VECH16-7-1YThree HE(1), HE(2), HE(3)40.0A @ 250VECH16-10-1YThree HE(1), HE(2), HE(3)60.0A @ 250VECH16-15-1Y

Six HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)40.0A @ 250VECH16-20-1Y

ECH16-25-1Y60.0A @ 250V40.0A @ 250V Three

ThreeHE(1), HE(2), HE(3)HE(4), HE(5), HE(6)

Three HE(1), HE(2), HE(3)10.0A @ 600VECH16-7-1G,JThree HE(1), HE(2), HE(3)20.0A @ 600VECH16-10-1GThree HE(1), HE(2), HE(3)15.0A @ 600VECH16-10-1JThree HE(1), HE(2), HE(3)30.0A @ 600VECH16-15-1GThree HE(1), HE(2), HE(3)25.0A @ 600VECH16-15-1J

Three HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)40.0A @ 600VECH16-20-1G

Three HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)30.0A @ 600VECH16-20-1J

Three HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)50.0A @ 600VECH16-25-1G

Three HE(1), HE(2), HE(3),HE(4), HE(5), HE(6)40.0A @ 600VECH16-25-1J

TABLE 14

11High Temperature Primary S15

S15 is the primary high temperature limit. It is lo-

cated in the electric heat unit immediately down-

stream from the heating elements. S15 is a single-

pole single-throw normally closed thermostat. S15

ratings are shown in table 15. A typical primary lim-

it is shown in figure 23.

FIGURE 23

PRIMARY LIMIT S15,SECONDARY LIMIT S20

FIGURE 24

THERMAL CUTOFFFUSE F5

Page 29

In ECH16R seriesunits, multiple S15thermostats may beused. One S15 ther-mostat is wired in se-ries with each heat-ing element. WhenS15 trips, some heat-ing elements may re-main operable.

ECH16 PRIMARY TEMPERATURE LIMIT S15 RATINGS

All S15 thermostats are auto-reset type single-pole single-throw.

Unit Close on Fall

ECH16R-5-1P

Open on Rise

*Uses two thermostats; one connected to each heating element.

ECH16R-7-1P*ECH16R-10-1P*ECH16R-15-1PECH16-15-1YECH16-20-1YECH16-7-1G,1JECH16-10-1G,1JECH16-15-1G,1JECH16-20-1G,1J

ECH16-20-1P

ECH16-25-1PECH16-5-1YECH16-7-1Y

ECH16-10-1Y

ECH16-25-1YECH16-25-1GECH16-25-1J

150F + 5F 110F + 7F

140F + 5F 100F + 6F

135F + 5F 95F + 6F145F + 5F 105F + 6F

120F + 5F 100F + 6F

150F + 5F 115F + 6F155F + 5F 115F + 7F

160F + 5F 120F + 6F

TABLE 15

In ECH16 commercial units, only one S15 thermo-stat is used. A single S15 thermostat is wired in se-ries with pilot relay K43. When S15 trips, all heatingelements are de-energized.

12High Temperature Secondary S20

ECH16 commercial units use non-resettable ther-mostats for secondary high temperature protec-tion. One switch is connected in series with eachleg of the element assembly. Each S20 thermostatis physically located adjacent to the element it isprotecting. S20 is a single-pole single-throw nor-mally closed thermostat. The thermostat actuatesat 185F + 8F on a temperature rise and cannot bereset. Once tripped, it must be replaced.

13High Temperature Secondary F5ECH16R series units usethermal cutoff fuses forsecondary high tempera-ture protection. The fusesare connected in serieswith each heating element(figure 24). The fuses areceramic non-resettablefusible links which must be

replaced after being tripped. Each cutoff is preset toopen at 170F + 3F.

14Heating ElementsECH16 and ECH16R heating elements are com-posed of helix wound nichrome wire heating ele-ments which are exposed directly to the airstream.Heating elements are energized directly by contac-tors or thermal (heat) relays located on the controlpanel. Once energized, heat transfer to the air-stream is instantaneous. Overtemperature protec-tion is provided by primary and secondary hightemperature limits. Overcurrent protection (ECH16commercial units only) is provided by current limit-ing fuses. Heating elements used in ECH16 andECH16R units are shown in table 16.

Unit Total Watts

TABLE 16

ECH16-5-PECH16-7-PECH16-10-PECH16-15-PECH16-20-PECH16-25-PECH16-5-YECH16-7-YECH16-10-YECH16-15-Y

5000 @ 240V7000 @ 240V10000 @ 240V15000 @ 240V20000 @ 240V25000 @ 240V5000 @ 240V7000 @ 240V10000 @ 240V15000 @ 240V

12/ Parallel2 / Parallel3/ Parallel3 / Parallel3 / Parallel3 / Delta3 / Delta3 / Deta3 / Delta

Number of Elements/Arrangement

ECH16-20-YECH16-25-Y

20000 @ 240V25000 @ 240V

6 / Delta6 / Delta

ECH16-7-GECH16-10-GECH16-15-G

7000 @ 480V10000 @ 480V15000 @ 480V

3 / Wye3 / Wye3 / Wye

ECH16-20-GECH16-25-G

20000 @ 480V25000 @ 480V

6 / Wye6 / Wye

ECH16-7-JECH16-10-JECH16-15-J

7000 @ 600V10000 @ 600V15000 @ 600V

3 / Wye3 / Wye3 / Wye

ECH16-20-JECH16-25-J

20000 @ 600V25000 @ 600V

6 / Wye6 / Wye

IVPLACEMENT AND INSTALLATION

Make sure that the unit is installed in accordance withthe installation instructions and all applicable codes.See accessories section for conditions requiring use ofthe optional roof mounting frame (RMF16).

VELECTRICAL CONNECTIONS

APower Supply

Refer to start-up directions and refer closely to the unitwiring diagram when servicing. Refer to unit name-plate for minimum circuit ampacity and maximumfuse size. 230/460/575 volt units are factory wired withorange wire connected to control transformer primary.208 volt units are field wired with red wire connected tocontrol transformer primary.

WARNINGElectric shock hazard.


Single-phase units are equippedwith single-pole contactors. Oneleg of compressor, capacitor andcondenser fan are always con-nected to line voltage. Turn offpower at disconnect before serv-icing.

BField Wiring

Unit and optional control field wiring is shown in theunit diagram section of this manual.

VISTART-UP OPERATION

APreliminary Checks 1 Make sure that the unit is installed in accordance

with installation instructions and applicable codes.

2 Inspect electrical wiring, both field and factoryinstalled for loose connections. Tighten as re-quired.

3 Check to ensure that refrigerant lines are in goodcondition and do not rub against the cabinet or oth-er refrigerant lines.

4 Check voltage at the disconnect switch. Voltagemust be within the range listed on nameplate. Ifnot, consult the power company and have the volt-age condition corrected before starting the unit.

5 Recheck voltage with unit running. If power is notwithin range listed on unit nameplate, stop unitand consult power company. Check amperage ofunit. Refer to unit nameplate for correct runningamps.

BCooling Start-Up:

NOTEThe following is a generalized procedure anddoes not apply to all thermostat control systems.Electronic and ramping thermostat control systemsmay operate differently. Refer to operation se-quence section of this manual for more information.

1 Set fan switch to AUTO or ON and move the sys-tem selection switch to COOL. Adjust the thermo-stat to a setting far enough below room tempera-ture to bring on the compressor.

2 Close unit disconnect switch. Compressor willstart and cycle with demand.

3 Refrigerant circuit is charged with HCFC22 refrig-erant. See unit rating plate for correct amount ofcharge.

4 Refer to Refrigeration System Service Checks sec-tion for proper method to check refrigerant charge.

CHeating Start-up:Set room thermostat for proper heat or auto operation,if switching subbase is used. Close disconnect switchand position heat setpoint lever above room tempera-ture. Refer to CHA16 unit installation instructions sec-tions for additional information on startup operationsand adjustments.

VIIREFRIGERATION SYSTEMSERVICE CHECKS

The charge should be checked during start-up usingthe method outlined below.

AGauge Manifold Attachment

Service gauge ports are identified in figures 10 and 9.Attach gauge manifold high pressure line to liquid linegauge port on thermometer well. Attach gauge man-ifold low pressure line to suction line service port.

NOTE When unit is properly charged (whether byapproach or subcooling method) liquid line pres-sures should approximate those given in table 18.

BCharging

It is not recommended that the system be charged be-low 60F (15C). If charging below 60F is required or ifthe system is completely void of refrigerant, the rec-ommended and most accurate method of charging is

to weigh refrigerant into unit according to amountshown on unit nameplate and in the specificationstable. If weighing facilities are not available or if theunit is just low on charge, use the following proce-dures:

Unit Void of Refrigerant 1 Connect an upright HCFC22 drum to the center

port of gauge manifold. Purge air from connectingline.

2 Start unit. 3 Open drum valve and charge a quantity of refriger-

ant gas into the system through the compressorsuction port, then close refrigerant drum valve. Al-low unit to run for a few minutes to stabilize operat-ing pressure. Determine correct charge as follows.

CHECKING CHARGEALL UNITS

1 This method uses a thermometer inserted in ther-mometer well to check liquid temperature. Makesure well is filled with oil before checking.

2 Allow unit to run for at least five minutes to stabi-lize pressures.

CHA16H261/311, CHA16411/413and CHA16R411 ONLY

(CHA16510/650 skip to step 6)(Subcooling Method)

3 If ambient temperature is above 60F (15C), placethermometer in well and read temperature.

4 Read liquid line pressure from gauge and convertto condensing temperature using standardHCFC22 temperature/pressure conversion chart(or conversion scale on gauge).

5 The difference between the liquid line temperature(from step 3) and the conversion temperature(from step 4) is subcooling (subcooling = conver-sion temp. minus liquid temp.). Subcooling tem-perature should approximate the values given intable 17. Add refrigerant to increase subcoolingand remove refrigerant to reduce subcooling.

MODEL NO.Subcooling F at Various Ambient Temps.

75F 85F 95F 105F 115F

CHA16R411

65F

CHA16H311CHA16H261 14 14 14 14 12 8

1218 18 16 14 12 8

915161717

TABLE 17

CHA16411 18 18 16 14 12 8

CHA16511/513CHA16651/653

CHA16R511 and CHA16R651 ONLY(Approach Method)

6 Check ambient (outdoor) temperature. 7 If ambient temperature is above 60F (15C), place

thermometer in well and read temperature. 8 Approach temperature is the difference between

ambient and liquid line temperatures (Approach =liquid minus ambient.) Approach temperatureshould be 4F (2C) for CHA16511/513 andCHA16R511 units. Approach temperature shouldbe 9F (5C) for CHA16651/653 and CHA16R651units. Refrigerant must be added to lower ap-proach temperature. Remove refrigerant from sys-tem to increase approach temperature.

IMPORTANTPotential for improper charging.

Can result in improper operation or componentfailure.

Use table 18 as a general guide for performingmaintenance checks. When unit is properlycharged (whether by approach or subcoolingmethod) line pressures should approximate thosegiven in table 18. Table 18 is not a procedure forcharging the system. Minor variations in thesepressures may be expected due to differences ininstallations. Significant deviations could meanthat the system is not properly charged or that aproblem exists with some component in the sys-tem. Used prudently, table 18 could serve as auseful service guide.

NORMAL OPERATING PRESSURES

LIQ.+ 10

SUC.+ 5

85 F 95 F 105 F

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

115 F65 FLIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

75 F

CHA16H261CHA16H311

CHA16411/413CHA16R411

CHA16511/513CHA16R511

CHA16651/653CHA16R651

MODEL NO.

TABLE 18

170171

163

159

153

6963

64

71.8

69.3

198201

187

187

181

7369

69

73.4

70.2

226223

216

216

211

295302

296

283

280

8280

78

77

74

261266

253

248

244

7776

74

75.2

72.1

8686

87

80.7

77.6

8383

83

78.8

75.8

329339

332

321

319

FIGURE 25

STATIC PRESSURETAP LOCATIONS

MANOMETER

UNIT

TABLE 19FOUR SPEED BLOWER MOTOR

Speed Tap NumberLowMediumLowMediumHighHighCommon

54321

TABLE 20FIVE SPEED BLOWER MOTORSpeed Tap Number

LowMediumLow

MediumHighHighCommon

65

321

Medium 4

Page 32

VIIIINDOOR BLOWEROPERATION / ADJUSTMENT

ABlower Operation

NOTE The following is a general procedure anddoes not apply to all thermostat control systems.

1 Blower operation is dependent on thermostat con-trol system option that has been installed in theCHA16. Refer to Control System Options sectionfor detailed descriptions of blower operation.

2 Generally, blower operation is set at the thermo-stat subbase fan switch. With the fan switch in theON position, the blower operates continuously.With the fan switch in the AUTO position, theblower cycles with demand (or, with some controlsystems, runs continuously while the heating orcooling circuits cycle).

3 In most cases, the blower and entire unit will be offwhen the system switch is in the OFF position.The only exception is immediately after a heatingdemand until blower control switches off.

BDetermining Unit CFM 1 The following measurements must be made with a

dry indoor coil. Run the blower without the coolingdemand. Air filters must be in place when mea-surements are taken.

2 Measure static pressure external to the unit (fromsupply to return).

To Measure Discharge Static Pressure:

aMeasure tap locations as shown in figure 25.

bPunch a 1/4 diameterhole. Insert manometerhose flush with the insideedge of hole or insulation.Seal around hole withpermagum. Connect zeroend of manometer to thedischarge (supply) side ofsystem. Connect otherend of manometer to re-turn duct as above.

cWith only the blower motor running, observe themanometer reading.

dSeal around the hole when check is complete.

3 The CFM can be adjusted by changing the motorspeed taps. Follow the blowe

Documents

SERVICE CHA16 UNIT INFORMATION 2–5 TON UNITSwebmanuals.lennoxeurope.com/Out of Production/Rooftop/CHA/CHA 16... · SERVICE CHA16 UNIT INFORMATION Page 1 ... 8.7 2 lbs. 12 oz. 9