PREHEAT-X-EXT Controller Technical GuideOVERVIEW 4 PREHEAT-X-EXT Technical Guide Overview The OE377-26-00061-1 PREHEAT-X-EXT Controller (AAON Part No. V48511) is designed to control

PREHEAT-X-EXT Controller Technical Guide

Factory Packaged Controls

PART NUMBER CROSS REFERENCE TABLE

PART DESCRIPTION ORION AAON TULSA

AAON COIL

PREHEAT-X-EXT Controller OE377-26-00061-1 V48511 V48511VCCX2 Controller OE338-23B-VCCX2 V87900 N/A VCC-X Controller OE338-23B-VCCX V43420 N/A VCB-X Controller OE332-26B-VCBX V28940 J00142VCM-X E-BUS Controller OE332-23E-VCMX V07150 31422Leaving Air Temperature Sensor OE231 P87140 28503Entering Air Temperature Sensor OE250 P87150 N/AEBC E-BUS Cables - varying lengths EBC-XXXF V167XX N/AHSSC Cables - varying lengths HSSC-XXXF Varies N/A

WattMaster Controls Inc.8500 NW River Park Drive · Parkville, MO 64152Toll Free Phone: 866-918-1100PH: (816) 505-1100 · FAX: (816) 505-1101 · E-mail: [email protected] our web site at www.orioncontrols.comWattMaster Form: AA-PREHEATX-EXT-TGD-01A

AAON® Manual Part No.: V97760Copyright May 2017 WattMaster Controls, Inc. AAON® is a registered trademark of AAON, Inc., Tulsa, OK.Neither WattMaster Controls, Inc. nor AAON® assumes any responsibility for errors or omissions in this document.This document is subject to change without notice.

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PREHEAT-X-EXT Technical Guide

TABLE OF CONTENTS

3

GENERAL INFORMATION ...................................................................................... 4Overview .................................................................................................................................................. 4Features .................................................................................................................................................. 4

INSTALLATION & WIRING ..................................................................................... 5Important Wiring Considerations ............................................................................................................. 5Input Wiring ............................................................................................................................................. 6Output Wiring ........................................................................................................................................... 7

INPUTS/OUTPUTS ................................................................................................. 8

OPERATION MODES .............................................................................................. 9Stand-Alone Mode ................................................................................................................................... 9Communicating Mode .............................................................................................................................. 9

LCD DISPLAY SCREENS ...................................................................................... 12

TROUBLESHOOTING ........................................................................................... 21LED Diagnostics .................................................................................................................................... 21Troubleshooting Conditions & Alarms ........................................................................................................ 21Temperature Sensors ................................................................................................................................. 22

APPENDIX A - Temperature Sensors .................................................................. 23Leaving Air Temperature Sensor Installation ......................................................................................... 23Leaving Air Temperature Sensor Wiring Chart ...................................................................................... 24

APPENDIX B - PREHEAT-X-EXT BACnet® ............................................................ 25PREHEAT-X-EXT BACnet® MS/TP Connection .................................................................................... 25PREHEAT-X-EXT BACnet® Points ........................................................................................................ 26

OVERVIEW

PREHEAT-X-EXT Technical Guide 4

Overview

The OE377-26-00061-1 PREHEAT-X-EXT Controller (AAON Part No. V48511) is designed to control fi xed stages of Preheat and optional modulating Preheat to maintain a desired Preheat Leaving Air Temperature Setpoint. See Figure 1 for dimensions.

The controller can be used as a stand-alone controller or commu-nicating with an AAON Unit Controller. The PREHEAT-X-EXT Controller connects to an AAON unit controller via a modular cable. See Figure 2, page 5 for wiring details.

The PREHEAT-X-EXT Controller has an extended Leaving Air Temperature Setpoint range down to 0°F. It should only be used with the approval of AAON.

General Information

Figure 1: OE377-26-00061-1 PREHEAT-X-EXT Controller Dimensions (In Inches)

Features

The PREHEAT-X-EXT Controller:

• Can be operated as a stand-alone controller or communicating with the VCCX2, VCC-X, VCB-X, and VCM-X E-BUS Controllers

• Monitors the Preheater Leaving Air Temperature and Leaving Air Reset Signal and controls to maintain Setpoint

• Has an extended Leaving Air Temperature Setpoint range down to 0°F

• Contains a 2 x 8 LCD character display and 4 buttons that allow for status display and setpoint changes

NOTE: The PREHEAT-X-EXT Controller contains no user-serviceable parts. Contact qualifi ed technical personnel if your PREHEAT-X-EXT Controller is not operating correctly.

5.73

2.62

2.04

4.09

0.57

0.21

5.04 5.63

5.24

Note: iDepth s 1.49 inches.

M

ENTER

UP

DOWN

ALARM

MENU

ALARM CONTACT

HEAT 1

HEAT 2

HEAT 3

HEAT 4

HEAT 5

HEAT 6

RLY COMM

HEATOUTPUTS

ANALOGOUTPUTS

0-10V MOD. SCR

GND

PWM +

PWM -

OE377-26-00061 PREHEAT-X AAON No.: V48510

WattMaster Label#LB102XXX-A

Rev.: 1A

E-BUSCONNECT

E-BUSCONNECT

LAT1

0-10V RESET

LAT2

OAT

GND

GND

ANALOG INPUTS

BINARY INPUTS

RS-485 COMM

+24

VA

C

GN

D

www.orioncontrols.com

www.aaon.com

ENABLE

T(-)

EMERG. SHUTDOWN

SHLD

FUTURE USE

R(+)

CONTACT RATING IS1 AMP MAX@ 24 VAC


WIRING

5

Important Wiring Considerations

Important Wiring Considerations

Please read carefully and apply the following information when wiring the PREHEAT-X-EXT Controller. The PREHEAT-X-EXT Controller requires the following electrical connections:

1. 18 gauge minimum wire unless otherwise noted.

2. 24 VAC power connection with an appropriate VA rating.

3. Leaving Air Temperature Sensors, Entering Air Temperature Sensor, and Heat Enable must have 24 gauge minimum wire.

4. All 24 VAC wiring must be connected so that all ground wires remain common. Failure to follow this procedure can result in damage to the module and connected devices.

5. All wiring is to be in accordance with local andnational electrical codes and specifi cations.

6. Check all wiring leads at the terminal block for tightness. Be sure that wire strands do not stick out and touch adjacent terminals. Confi rm that all transducers required for your system are mounted in the appropriate location and wired into the correct terminals.

WARNING: Observe polarity! All boards must be wired GND-to-GND and 24 VAC-to-VAC. Failure to observe polarity could result in damage to the board.

WIRING


Inputs Wiring

Figure 2: PREHEAT-X-EXT Inputs Wiring Diagram

M

ENTER

UP

DOWN

ALARM

MENU

ALARM CONTACT

HEAT 1

HEAT 2

HEAT 3

HEAT 4

HEAT 5

HEAT 6

RLY COMM

HEATOUTPUTS

ANALOGOUTPUTS

0-10V MOD. SCR

GND

PWM +

PWM -



Rev.: 1A

E-BUSCONNECT

E-BUSCONNECT

LAT1

0-10V RESET

LAT2

OAT

GND

GND

ANALOG INPUTS

BINARY INPUTS

RS-485 COMM

+2

4V

AC

GN

D


www.aaon.com

ENABLE

T(-)

EMERG. SHUTDOWN

SHLD

FUTURE USE

R(+)


Mount Inside PREHEAT-XBox Wall

AIN1Entering Air

Temperature Sensor

Make SpliceConnectionsInside Sensor

EnclosureAs Shown. Seal All

Conduit FittingsWith Silicone

Mount Sensor OutdoorsIn Shaded Protected

Area & In UprightPosition As Shown

0-10 VDC

GND

+-

EmergencyShutdown

Line

GN

D

24V

AC

COM

PREHEAT-X-EXT CONTROLLER(OE377-26-00061-1)

AIN2

AIN3

RST

GNDGND

BIN1

BIN2

Leaving Air 2Temperature Sensor

Leaving Air 1Temperature Sensor

SAFETIES(BY OTHERS)

N.C.

Heat EnableSignal (24 VAC)

W1

NOTE: Reset In And HeatEnable Inputs Are Used InStand-Alone Mode Only

Mount Inside PREHEAT-XBox Wall

Reset In

Size Transformer ForCorrect Total Load.PREHEAT-X-EXTController = 11 VA

Inputs Wiring

The PREHEAT-X-EXT Controller works as Stand-Alone or com-municating with the VCCX2, VCC-X, VCB-X or VCM-X E-BUS Controller. For connection to a VCCX2, VCC-X, VCB-X or VCM-X E-BUS Controller, use an E-BUS Cable connecting to the appro-priate E-BUS ports on those controllers. The Reset Input and Heat Enable are only used in Stand-Alone Mode. See Figure 2 below for Inputs Wiring.


WIRING

7

Outputs Wiring

Figure 3: PREHEAT-X-EXT Outputs Wiring Diagram

Outputs Wiring

The PREHEAT-X-EXT Controller works as Stand-Alone or com-municating with the VCCX2, VCC-X, VCB-X or VCM-X E-BUS Controller. For connection to a VCCX2, VCC-X, VCB-X or VCM-X E-BUS Controller, use an E-BUS Cable connecting to the appro-priate E-BUS ports on those controllers. See Figure 3 below for Outputs Wiring.

M

ENTER

UP

DOWN

ALARM

MENU

ALARM CONTACT

HEAT 1

HEAT 2

HEAT 3

HEAT 4

HEAT 5

HEAT 6

RLY COMM

HEATOUTPUTS

ANALOGOUTPUTS

0-10V MOD. SCR

GND

PWM +

PWM -



Rev.: 1A

E-BUSCONNECT

E-BUSCONNECT

LAT1

0-10V RESET

LAT2

OAT

GND

GND

ANALOG INPUTS

BINARY INPUTS

RS-485 COMM

+2

4V

AC

GN

D


www.aaon.com

ENABLE

T(-)

EMERG. SHUTDOWN

SHLD

FUTURE USE

R(+)


Line

GN

D

24

VA

C

Heat 1 Relay

Heat 2 Relay

Heat 3 Relay

Heat 4 Relay

Heat 5 Relay

Heat 6 Relay

Alarm

Note:All Relay Outputs AreNormally Open And RatedFor 24 VAC Power Only.1 Amp Maximum Load.

PWM SSR

Modulating SCR(0-10 VDC)

PREHEAT-X-EXT CONTROLLER(OE377-26-00061-1)

EBC E-BUS CableConnects To

VCCX2, VCC-X Or VCB-XController’s

Expansion Port

HSSC E-BUS CableConnects To

VCM-X Controller’sExpansion Port

RelayContact

+

+

–

–


INPUTS & OUTPUTS

PREHEAT-X-EXT Technical Guide8

Inputs and Outputs

Table 1: PREHEAT-X-EXT Controller Inputs & Outputs

Analog Inputs

Leaving Air Temperature 1 (LAT1)When enabled, the PREHEAT-X-EXT Controller will control to a Leaving Air Temperature Setpoint. The Controller can be confi gured to use only LAT 1 for this purpose. Typically, the average of LAT1 and LAT2 is used.

Leaving Air Temperature 2 (LAT2)When enabled, the PREHEAT-X-EXT Controller will control to a Leaving Air Temperature Setpoint. The Controller can be confi gured to use only LAT 2 for this purpose. Typically, the average of LAT1 and LAT2 is used.

Entering Air TemperatureWhen the Entering Air Temperature falls below the Entering Air Temperature Setpoint, preheat will be enabled.

I/O Map

See Table 1 below to reference the inputs and outputs that are avail-able on the PREHEAT-X-EXT Controller.

Analog Inputs

1 Leaving Air Temperature 1 (LAT1)2 Leaving Air Temperature 2 (LAT2)3 Entering Air Temperature Sensor4 Reset In (0-10 VDC)

Binary Inputs1 Heat Enable 2 Emergency Shutdown3 Future Use

Analog Outputs 1 0-10 VDC Mod SCR2 PWM SSR

Relays1 Alarm2 Heat 13 Heat 24 Heat 35 Heat 46 Heat 57 Heat 6

NOTE: For AIN1 through AIN3, all Temperature Sensors must be Thermistor Type III which provide 77.0°F @ 10K Ohms Resistance.

Reset Input (0-10 VDC)Used only in stand-alone operation. The Leaving Air Temperature Setpoint can be reset by supplying a 0-10 VDC signal to the RST IN low voltage terminal block. This reset signal is optional and need only be used if you require resetting of the discharge air temperature.

Binary Inputs

Heat Enable Contact (HEAT EN)This input is only required when the controller is used in stand-alone operation; it is not required when communicating with an AAON Unit Controller. The Heat Enable input is activated by a 24VAC signal supplied from a building automation system to enable the PREHEAT-X-EXT Controller. The controller will not operate without 24VAC being applied to this input terminal when used in a stand-alone confi guration. When the Heat Enable signal is lost or turned off, all stages de-activate immediately.

Emergency Shutdown InputThis wet contact (24 VAC) input is used to initiate shutdown of the HVAC unit when a N.C. Smoke Detector (by others), Firestat (by oth-ers), or other shutdown condition (by others) occurs and the contact is opened. The controller remains active and can initiate alarm relays.

Analog Outputs

0-10 VDC Modulating SCRDepending on the type of Heat used, this output will supply a 0-10 VDC output signal for control of the modulating SCR Heat.

Pulse Width Modulating SSR

Depending on the type of Heat used, this output will supply a 12 V PWM Output Signal for control of the modulating SSR Heat.

Relay Outputs

Relay #1 - AlarmThis relay sends a signal when an alarm is enabled.

Relays #2 - 6—Fixed Stage Heat Outputs


OPERATION MODES

9

Outputs and Operation Modes

Operation Modes

The PREHEAT-X-EXT Controller can be used stand-alone or com-municating with an AAON Unit Controller using a modular cable.

Stand-Alone ModeWhen used in a stand-alone application, the PREHEAT-X-EXT Controller will modulate SCR or SSR Heat and stage any addi-tional fi xed stages to maintain the Leaving Air Temperature setpoint confi gured on the PREHEAT-X-EXT Controller LCD display. The PREHEAT-X-EXT Controller is activated by a 24VAC signal to the HEAT EN input.

Communicating ModeWhen the PREHEAT-X-EXT Controller is connected and communi-cating with an AAON Unit Controller via a modular cable, the neces-sary information will be passed between the PREHEAT-X-EXT and the Main Unit Controller to properly operate in the Heating Mode.

If the communication is interrupted between the PREHEAT-X-EXT Controller and the Main Controller, both boards will show an alarm and the PREHEAT-X-EXT outputs will turn off. When communica-tion is restored, the alarms will go away.

In this confi guration, the Leaving Air Temperature Setpoints and the Preheat Enable Sepoints are set using the Main Controller.

Zone

ZoneSEQUENCE OF OPERATIONS

10 PREHEAT-X-EXT Technical Guide

Preheat Enable

Stand Alone ModeEnabled when the Binary Input is closed and the Entering Air Tem-perature is below setpoint.

E-BUS Communications ModeEnabled by an E-BUS command when the Entering Air Temperature falls below the Preheat Setpoint.

BACnet Communications ModeEnabled by BACnet command or Binary Input, whichever occurs fi rst.

Leaving Air Temperature Sensor

The controller can be confi gured to use one of three sensor confi gu-rations for control.

• Leaving Air Temperature Sensor 1 only (LAT1)

• Leaving Air Temperature Sensor 2 only (LAT2)

• Average Leaving Air Temperature which averages LAT1 and LAT2

Leaving Air Temperature Setpoint

Stand Alone

• Leaving Air Temperature Setpoint can be reset between the LAT Setpoint and LAT Setpoint Reset Limit.

• The Reset Source is based on a 0-10 VDC input and range can be adjusted using the LAT Setpoint Reset Source Low and LAT Setpoint Reset Source High Setpoints.

E-BUS and BACnet Communications Mode

• A Leaving Air Temperature Setpoint will be sent to the controller.

• This value is stored in volatile memory and will be lost at reset.

• There are separate Leaving Air Temperature Setpoints, depending on if the unit is in Heating, Vent, or Cool Mode.

Modulating Heat

• If confi gured, the Modulating Heat output will be used as the fi rst stage of heat.

• Analog Voltage Output can be adjusted between 0-10 VDC as needed to maintain the Leaving Air Setpoint.

• Controlled by an Internal PID Loop.

Heat Staging Up

The following conditions must be met before the fi rst (next) stage of heat can be energized:

• Preheat Enable Signal/Command must be active.

• The LAT must be below the LAT Setpoint by any amount.

• If Mod Heat is confi gured, it must be at 100% for the Stage Up Delay.

• The Minimum Off Time must be met.

• The Stage Up Delay must be met (for second stage and above).

Heat Staging Down

The following conditions must be met before a stage of heat can be de-energized:

• Preheat Enable Signal/Command is deactivated -OR- the LAT must be above the LAT Setpoint by the LAT Deadband.

• If Modulating Heat is confi gured, it must be at 0% for the stage down delay.

• The Minimum Run time must be met.

• The Stage Down Time must be met.

Operation Modes

SEQUENCE OF OPERATIONS

11 PREHEAT-X-EXT Technical Guide

Emergency Shutdown

The Emergency Shutdown input must always be used and wired as a 24 VAC normally closed contact. If an Emergency Shutdown occurs, and that contact opens:

• All outputs will be immediately de-energized.

• An alarm will be generated.

High Leaving Air Temperature Alarm

• If the Leaving Air Temperature is above the LAT High Temperature Alarm Limit for more than the Alarm Delay all heating outputs will be de-energized immediately.

• An alarm will be generated.

• A manual reset will be required.

Low Leaving Air Temperature Alarm

If the Leaving Air Temperature is below the LAT Low Temperature Alarm Limit for more than 2 minutes, the heat will remain on but an alarm will be generated.

Operation Modes

LCD DISPLAY SCREENS


Navigation Keys

LCD Display Screen & Navigation Keys

The PREHEAT-X-EXT Controller allows you to make confi gura-tion changes, view status, change setpoints, create force modes, and perform diagnostics using the keypad next to the LCD display. See Figure 4 and refer to Table 2 for descriptions.

Figure 4: LCD Display and Navigation Keys

Table 2: Navigation Key Functions

NAVIGATION KEY

KEY FUNCTION

MENU Use the MENU key to navigate through the PREHEAT-X-EXT Main Menu Screens.

UP Use this key to adjust setpoints and change confi gurations.

DOWN Use this key to adjust setpoints and change confi gurations.

ENTER Use the Enter key to move through screens within Main Menu categories. Also, use this key to save setpoints and confi guration changes.


LCD DISPLAY SCREENS

13

CONFIG

HEAT STG 3

MOD HEATYES

LAT CFGAVERAGE

AOUT VLO0.0

AOUT VHI10.0

MOD Kp15.0

MOD Ki6.0

MOD TIME10.0

STG UP20

STG DWN20

MIN RUN20

MIN OFF20

SCALINGDEG.F

Main Screens Map

COMMCONFIG

COM MODES-ALONE

MAC ADDR0

BAC ID15000

BAC BAUD38.400

ALARMS

NOALARMS

E-SHDNOK

LA1 SENSOK

LA2 SENSOK

LOW LATOK

HI LATOK

EA SENSOK

COM STATOK

SETPOINTS

LA SPT70.0

RST LMT70.0

EA EN SP55.0

STATUS

SS1099VER X.XX

PREHEATENABLED

CONT TMP50.3

LA SPT70.0

STGS ON2

MOD HEAT32%

LA1 TEMP50.6

LA2 TEMP50.0

AVG TEMP50.3

ENT AIR26.6

PREHEATCONTROL

Figure 5: PREHEAT-X-EXT Main Screens Map

EBUS CFGVCB-X

LA1 CAL0.0

LA2 CAL0.0

EA CAL0.0

MOD Kd4.0

LCD DISPLAY SCREENS


PREHEAT-X-EXT Main Screens

PREHEAT-X-EXT Main Screens

Refer to the following map when navigating through the LCD Main Screens. The fi rst screen is an initialization screen. To scroll through the rest of the screens, press the <MENU> button.

PREHEATCONTROL

STATUS

ALARMS

SETPOINTS

Press to scroll through STATUS Screens.

Press to go to SETPOINTS Screens.

Press to go to ALARMS Screens.

Press to go to CONFIGURATION Screens.

Press to go to STATUS Screens.

Press to scroll through PREHEAT Screens.

Alarms will display automatically.

CONFIG

Press to scroll through CONFIGURATION Screens.

Press to go to COMM Confi guration Screens.

COMMCONFIG

Press to scroll through COMM Screens.

Press to scroll through SETPOINTS Screens.


LCD DISPLAY SCREENS

15

Status Screens

Refer to the following map when navigating through the Status Screens. From the STATUS Screen, press <ENTER> to scroll through the screens.

STATUS

PREHEATENABLED/DISABLED

LA SPT

Status Screens shown below will scroll automatically if LCD display is left on this screen for 20 seconds.

PREHEAT

Gives the Enabled status for the Preheat Mode. The controller can be enabled from one of the following: (1) Binary Input in Stand-Alone Mode, (2) E-BUS command from VCCX2, VCC-X, VCB-X or VCM-X,

(3) BACnet Point.

LEAVING AIR TEMPERATURE SETPOINT

Displays the current Leaving Air Setpoint that the controller is trying to maintain. This value can come from the following based on

confi guration: (1) Internal Setpoints +/- Setpoint Reset Input, (2) E-BUS input from VCCX2, VCC-X, VCB-X, VCM-X, or (3) BACnet Point.

CONT TMPXX.X

CONTROL TEMPERATURE

Displays the current controlling temperature. This could be one of the following based on confi guration: (1) Leaving Air Sensor 1,

(2) Leaving Air Sensor 2, or (3) the average of both.

LA2 TEMPXX.X

LEAVING AIR TEMPERATURE 2

Displays the Leaving Air Temperature 2 Sensor’s current reading.

Status Screens

MOD HEATXX.X%

MODULATING HEATING OUTPUT

Displays the current Modulation output Percentage of both the Analog and PWM outputs (they control together).

AVG TEMPXX.X

AVERAGE TEMPERATURE

Displays the current average temperature of both Leaving Air Temperature Sensors.

ENT AIRXX.X

ENTERING AIR TEMPERATURE

Displays the current Entering Air Temperature Sensor reading.

LA1 TEMPXX.X

LEAVING AIR TEMPERATURE 1

Displays the Leaving Air Temperature 1 Sensor’s current reading.

CURRENT NUMBER OF ACTIVE STAGES

Displays the number of heat stages currently energized. This includes the First Modulating Stage of Heat.

STGS ON#

SS1099VER X.XX

CURRENT SOFTWARE VERSION

Displays the current software version installed in the controller.

LCD DISPLAY SCREENS


Setpoint Screens

Refer to the following map when navigating through the Set-point Screens. From the SETPOINTS Screen, press <ENTER> to scroll through the screens and change setpoints. Use the <UP> and <DOWN> arrow keys to change your selections. Then press <ENTER> to save the new setpoint.

NOTE: When the PREHEAT-X-EXT is operating in Communications Mode, these setpoint screens will not appear on the LCD display because they are controlled by the Main Controller.

SETPOINTS

LA SPXX.X°FXX.X°C

RST LMTXX.X°FXX.X°C

LEAVING AIR TEMPERATURE SETPOINT

Will display only in stand-alone mode. This is the target temperature while the heating is enabled. If you are using the reset signal, this is the setpoint it will calculate to at zero volts.

The LA Setpoint is set by the LCD Display in stand-alone mode and is set by the Main Controller in communicating mode.

Minimum Default Maximum0°F

-17.7°C70°F21°C

90°F32°C

RESET LIMIT SETPOINT

Will display and be used only in stand-alone mode. If Remote Reset is being utilized, this will be the Leaving Air Setpoint when the Reset Volt-age Input is at 10VDC.

Minimum Default Maximum0°F

-17.7°C70°F21°C

120°F48.8°C

Setpoint Screens

EA EN SPXX.X°FXX.X°C

ENTERING AIR ENABLE SETPOINT

This is the temperature at which Preheat is enabled. The Entering Air Enable Setpoint is set by the LCD Display in stand-alone mode and is set by the Main Controller in communicating mode.

Minimum Default Maximum-40°F-40°C

55°F12.7°C

90°F32°C

LA1 CALXX.X°FXX.X°C

LEAVING AIR SENSOR 1 CALIBRATION OFFSET

If the sensor is reading incorrectly, you can use this screen to enter an offset temperature to adjust the sensor’s temperature. Enter a positive value to raise the sensor’s temperature or a negative value to lower the sensor’s temperature.

Minimum Default Maximum-100.0°F-55.5°C

0.0°F0.0°C

100.0°F55.5°C

LA2 CALXX.X°FXX.X°C

LEAVING AIR SENSOR 2 CALIBRATION OFFSET



0.0°F0.0°C

100.0°F55.5°C


LCD DISPLAY SCREENS

17

Alarm Screens

Refer to the following map when viewing Alarm Screens. These screens will display automatically when alarms are present. For alarm troubleshooting, see pages 21-22.

ALARMS

ALARMS

The alarms are as follows:

NO ALARMS: This will be shown if there are no current alarms.

E-SHDN: If 24VAC is removed from the Emergency Shutdown Input, this alarm will activate and the controller will turn off all outputs. The alarm will be disabled when voltage has returned.

LA1 SENS: The fi rst Leaving Air Temperature Sensor has been discon-nected, shorted, open, or missing for more than 60 seconds. This alarm will be disabled when the sensor is working again.

LA2 SENS: The second Leaving Air Temperature Sensor has been disconnected, shorted, open, or missing for more than 60 seconds. This alarm will be disabled when the sensor is working again.

LO LAT: This indicates a Leaving Air Temperature Cutoff Alarm condi-tion which is activated if the Controlling Leaving Air Temperature has dropped below 0ºF for more than 2 minutes. The alarm will be disabled if after a fi xed delay period the Leaving Air Temperature has risen above 0ºF.

HI LAT: This indicates a Leaving Air Temperature Cutoff Alarm condition which is activated if the Controlling Leaving Air Temperature has risen above 120ºF. All outputs will stage off.

EA SENS: The Entering Air Temperature Sensor has been disconnect-ed, open, shorted, or missing for more than 60 seconds. This alarm will be disabled when the sensor is working again.

COM STAT: Communications have been lost with the main controller for more than 30 seconds. This alarm will disable when communications resume.

Setpoint & Alarm Screens

EA CALXX.X°FXX.X°C

ENTERING AIR SENSOR CALIBRATION OFFSET



0.0°F0.0°C

100.0°F55.5°C

LCD DISPLAY SCREENS


Confi guration Screens


Refer to the following map when navigating through the Con-fi guration Screens. From the CONFIG Screen, press <ENTER> to scroll through the screens and change setpoints. Use the <UP> and <DOWN> arrow keys to change your selections. Press <ENTER> to save any changes.

CONFIG

HEAT STG0-6

# OF HEAT STAGES

Select the total number of Heat Stages including the Modulating Stage. Range is 0-6. Default is 0.

AOUT VLO0.0-10.0 VOLTS

MINIMUM SCR VOLTAGE

This is the Low Voltage setting for the Analog Output. It sets the voltage level needed for 0%. Range is 0 -10. Default is 0.

.

MOD HEATYES/NO

MODULATING HEAT

If either the Analog or PWM Modulating Heat output is being used, this must be set to YES. Default is NO.

LAT CFGLAT1,LAT2,AVERAGE

LEAVING AIR TEMPERATURE SENSOR CONFIGURATION

LAT1: Use Leaving Air Temperature Sensor 1 as the Controlling Temp.LAT2: Use Leaving Air Temperature Sensor 2 as the Controlling Temp.AVERAGE: Use the Average of LAT1 & LAT2 as the Controlling Temp.

Default is AVERAGE.

AOUT VHI0.0-10.0 VOLTS

MAXIMUM SCR VOLTAGE

This is the High Voltage setting for the Analog Output. It sets the volt-age level needed for 100%. Range is 0 -10. Default is 10.

MOD Kp15.0

INTEGRAL CONSTANT

This is the Internal PID Kp Constant. Do not make changes to this value unless told to do so by WattMaster Technical Support.

.

MOD TIME1-120 SEC

MODULATION RATE

This is the time period setting that determines how often a change is made to the modulating output. Range is 1 - 120 seconds.

Default is 20.

MOD Ki6.0

AIRFLOW INTEGRAL

This is the Internal PID Ki Constant. Do not make changes to this value unless told to do so by WattMaster Technical Support.

MOD Kd6.0

DERIVATIVE CONSTANT

This is the Internal PID Kd Constant. Do not make changes to this value unless told to do so by WattMaster Technical Support.


LCD DISPLAY SCREENS

19

SCALINGDEG. FDEG. C

TEMPERATURE SCALE

Fahrenheit (default) or Celsius. This setting is used only in stand-alone mode.

STG UP0-1200 SECONDS

STAGE UP DELAY

If confi gured for SCR modulation, this is the amount of time (in sec-onds) the controller must wait to activate an additional stage of heat if

the Min Off Time is met. Range is 0 - 1200. Default is 180.

STG DWN0-1200 SECONDS

STAGE DOWN DELAY

If confi gured for SCR modulation, This is the amount of time (in sec-onds)the controller must wait to deactivate a stage of heat if the Min

Run time is met. Range is 0 - 1200. Default is 180.

MIN RUN0-1200 SECONDS

MINIMUM RUN TIME

This is the amount of time (in seconds) a stage of heat must remain on before it can be deactivated. Range is 0 - 1200. Default is 120.

MIN OFF0-1200 SECONDS

MINIMUM OFF TIME This is the amount of time (in seconds) a stage of heat must remain off

before it can be activated. Range is 0 - 1200. Default is 60.


LCD DISPLAY SCREENS


COMM MODEBACNET, EBUS,

S-ALONE

COMMUNICATION MODEThis setting confi gures the communications mode. The choices are (1)

BACNET, (2) EBUS, or (3) S-ALONE (default).

Communicating Confi guration Screens

MAC ADDR0-128

BAC ID0-30,000

BACnet® - CURRENT MAC ADDRESS

Valid range is 0 to 128. Default is 0.

BACnet® - CURRENT ID Start

Range is 0-30,000. Default is 15,000..

BAC BAUD38400

BACnet® - CURRENT BAUD RATE

9600, 19200, 38400, 57600, 76800. Default is 38400.

Communication Confi guration ScreensRefer to the following map when navigating through the Commu-nicating Confi guration Screens. From the COM CONFIG Screen, press <ENTER> to scroll through the screens and change setpoints. Use the <UP> and <DOWN> arrow keys to change your selections. Press <ENTER> to save any changes.

COMMCONFIG

E-BUS CFGVCM-X, VCB-X/ VCC-X or NONE

E-BUS CONFIGURATIONSelect the type of controller that the PREHEAT-X-EXT is connected to. The choices are VCCX2, VCC-X, VCB-X, VCM-X, or NONE (default).

NOTE: You must cycle power after changing this setting.


TROUBLESHOOTING

21

LED Diagnostics & Alarms

LED DiagnosticsThe PREHEAT-X-EXT Controller is equipped with LEDs that can be used to verify operation and perform troubleshooting. See Figure 6, below for the LED locations. The LEDs associated with these inputs and outputs allow you to see what is active without using a voltmeter. The LEDs and their uses are as follows:

STATUS LEDs POWER - This green LED will light up to indicate that 24 VAC power has been applied to the controller.

Diagnostic LEDsALARM - This red LED located on the PREHEAT-X-EXT Control-ler’s cover above the LCD display will light up to indicate an alarm. The type of alarm(s) will be shown on the LCD display.

Communication LEDCOMM - This yellow LED will light up and blink when communica-tions are detected.

Relay LEDsRLY 1-6 - These green LEDs will light up and stay lit as long as the Heat Relay(s) is active.

Binary Input LEDsHEAT EN - This green LED will light up when Heat is enabled.

EMERGENCY SHUTDOWN - This green LED will light up when Emergency Shutdown is enabled.

Figure 6: PREHEAT-X-EXT Controller LED Locations and Descriptions

OS LEDWDOG LED

APP LED

STAT LED

ALARM LED

HEAT ENABLE LED

COMM LED

EMERGENCYSHUTDOWN LED

ALARM LED

TROUBLESHOOTING


Troubleshooting Alarms

Mechanical Failure:• Check relay outputs on the PREHEAT-X-EXT for 24 VAC output.

• Verify output voltage (VOUT and GND) to SCR or PWM

• Verify that the Leaving Air Temperature Sensor(s) is connected to AIN1 and/or AIN2 and GND on the PREHEAT-X-EXT

• Verify Leaving Air Temperature Sensor probe(s) is mounted correctly

• Remove AIN1 and AIN2 and GND wiring from the PREHEAT-X-EXT and ohm the sensor out (this may indicate open or failed wiring). Refer to chart in back of this guide for readings.

Leaving Air Temperature Failure:• Verify that the Leaving Air Temperature Sensor(s) is connected to the AIN1 and/or AIN2 and GND on the PREHEAT-X-EXT.

• Remove AIN1 and AIN2 and GND wiring from the PREHEAT-X-EXT and ohm the sensor out (this may indicate open or failed wiring). Refer to chart in back of this guide for readings.

Alarms & LED Locations

Communications Loss:• Check COMM LED on PREHEAT-X-EXT.

• Verify 24 VAC power to all interconnected WattMaster controllers.

• Verify connection between the PREHEAT-X-EXT and associated WattMaster controllers.

• In communication mode (connected to a an AAON Unit with modular cable), verify PREHEAT-X-EXT confi guration on AAON unit.


APPENDIX A

23

Leaving Air Temperature Sensor Installation

Mounting the Leaving Air Temperature Sensor

• The Leaving Air Temperature (LAT) Sensor should be located in PREHEAT-X-EXT box’s output location.

• Locate the sensor in the center of the widest part of the PREHEAT-X-EXT box wall. Use the supplied template and a 5/16” drill to make a hole for the sensor.

• Install the gasket over the probe and mount securely to the box wall using the supplied sheet metal screws. Be sure the gasket is compressed to provide an air tight seal.

• For best accuracy, apply insulation on the outside of the box wall, over the sensor. This will help prevent thermal gradients from affecting the sensor.

Figure 7: Leaving Air Temperature Sensor Installation

Leads Are Non-Polarized. Butt Splice LeadsTo 24 Gauge Wire Minimum.

Connect Leads to ”AIN1 And/Or “AIN2” And “GND” OnPREHEAT-X-EXT Controller. See Figure 2 on page 5for details.

Inside Wall of PREHEAT-X Box

WARNING: Make sure your Leaving Air Temperature Sensor(s) are mounted and wired according to these instructions prior to testing the unit or else the modulating valve will not control properly and may damage your equipment.

TROUBLESHOOTING


LAT Sensor Testing

Leaving Air Temperature Sensor

If you suspect the Leaving Air Temperature Sensor is not reading correctly, make sure the wiring terminal connections are tight and that any wiring splices are properly connected. You can check the operation of the Leaving Air Temperature Sensor by measuring the resistance or voltage using a digital multimeter. Set the meter to DC Volts. Place the positive probe on the AIN terminal and the negative probe on the GND terminal. Read the DC Volts and fi nd that voltage in Table 3.

Read the temperature corresponding with that voltage and determine if this is close to the actual temperature the sensor is exposed to. If the temperature from the chart is different by more than a few degrees, you probably have a defective or damaged sensor. You can also check the sensor resistance to determine correct operation. To read the resistance, set the meter to Ohms. Unplug the sensor connector from the board and measure the resistance across the disconnected wires. This resistance should match the corresponding temperature from Table 3.

Temperature to Resistance/Voltage ChartTemp(°F)

Temp(°C)

Resistance(Ohms)

Voltage @Input (VDC)

-10 -23.3 93333 2.98-5 -20.6 80531 2.940 -17.8 69822 2.895 -15.0 60552 2.83

10 -12.2 52500 2.7715 -9.4 45902 2.7120 -6.7 40147 2.6425 -3.9 35165 2.5730 -1.1 30805 2.4935 1.6 27140 2.4140 4.4 23874 2.3345 7.2 21094 2.2450 10.0 18655 2.1552 11.1 17799 2.1154 12.2 16956 2.0856 13.3 16164 2.0458 14.4 15385 2.0060 15.6 14681 1.9662 16.7 14014 1.9364 17.8 13382 1.8966 18.9 12758 1.85

Temperature to Resistance/Voltage ChartTemp(°F)

Temp(°C)

Resistance(Ohms)

Voltage @Input (VDC)

68 20.0 12191 1.8169 20.6 11906 1.7970 21.1 11652 1.7871 21.7 11379 1.7672 22.2 11136 1.7473 22.7 10878 1.7274 23.3 10625 1.7075 23.9 10398 1.6876 24.4 10158 1.6678 25.6 9711 1.6380 27.8 9302 1.5982 27.8 8893 1.5584 28.9 8514 1.5286 30.0 8153 1.4888 31.1 7805 1.4590 32.2 7472 1.4195 35.0 6716 1.33

100 37.8 6047 1.24105 40.6 5453 1.16110 43.3 4923 1.09115 46.1 4449 1.02120 48.9 4030 .95125 51.7 3656 .88130 54.4 3317 .82135 57.2 3015 .76140 60.0 2743 .71145 62.8 2502 .66

Table 3: 0-3.3 V Temperature Sensor - Voltage & Resistance for Type III Sensors

Table 3, continued: 0-3.3 V Temperature Sensor - Voltage & Resistance for Type III Sensors

Thermistor Sensor Testing Instructions1.) Use the resistance column to check the thermistor sensor while disconnected from the controllers (not powered).

2.) Use the voltage column to check sensors while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-” (minus) lead on GND terminal and the “+” (plus) lead on the sensor input terminal being investigated.

If the voltage is above 3.3 VDC, the sensor or wiring is “open.” If the voltage is less than 0.05 VDC, the sensor or wiring is shorted.


APPENDIX B

25

PREHEAT-X-EXT BACnet® Connection To MS/TP Network

Figure 8: PREHEAT-X-EXT BACnet® Connection to MS/TP Network

MS/TP ConnectionTo BACnet

®

SHLDT -

R +

Typical Terminal Blocks. AllWiring To Be T To T, SHLD(G) To SHLD (G) & R To R

Wiring Notes:1.) All wiring to be in accordance with local and national electricalcodes and specifications.

2.) All communication wiring to be 18 gauge minimum, 2 conductortwisted pair with shield. Use Belden #82760 or equivalent.

24VAC

GND

Line Voltage


PREHEAT-X-EXTCONTROLLER

Programming Note:

See Page 20

Use CommunicationConfiguration Screens InLCD Display To ProgramThe BACnet Settings.

For Details.

M

ENTER

UP

DOWN

ALARM

MENU

ALARM CONTACT

HEAT 1

HEAT 2

HEAT 3

HEAT 4

HEAT 5

HEAT 6

RLY COMM

HEATOUTPUTS

ANALOGOUTPUTS

0-10V MOD. SCR

GND

PWM +

PWM -



Rev.: 1A

E-BUSCONNECT

E-BUSCONNECT

LAT1

0-10V RESET

LAT2

OAT

GND

GND

ANALOG INPUTS

BINARY INPUTS

RS-485 COMM

+24

VA

C

GN

D


www.aaon.com

ENABLE

T(-)

EMERG. SHUTDOWN

SHLD

FUTURE USE

R(+)


M

ENTER

UP

DOWN

ALARM

MENU

ALARM CONTACT

HEAT 1

HEAT 2

HEAT 3

HEAT 4

HEAT 5

HEAT 6

RLY COMM

HEATOUTPUTS

ANALOGOUTPUTS

0-10V MOD. SCR

GND

PWM +

PWM -


WattMaster Label

Rev.: 1B#S 000062W

E-BUSCONNECT

E-BUSCONNECT

LAT1

0-10V RESET

LAT2

OAT

GND

GND

ANALOG INPUTS

BINARY INPUTS

RS-485 COMM

+2

4 V

AC

GN

D

www.aaon.com

ENABLE

T(-)

EMERG. SHUTDOWN

SHLD

FUTURE USE

R(+)



MSTPBACnet

APPENDIX B


PREHEAT-X-EXT BACnet® Points

BACnet® Properties for the PREHEAT-X-EXTPARAMETER OBJECT DESCRIPTION LIMITS

Active Controlling

Setpoint

AI: 1 The current Active Controlling Setpoint

Read Only

Number of Heat Stages

On

AI:2 The current number of heat stages on

Read Only

Modulating Output

Position

AI: 3 The current Modulating Output Position

Read Only

All Alarms Bitfi eld

AI: 4 The current Alarm Status in a Bitfi eld

Read OnlySee Alarm

Bits, this page.

Entering Air Temperature

AI: 5 The current Entering Air Temperature

Read Only

Leaving Air Temp Sensor 1

AI:6 The current Leaving Air Sensor 1 Temperature

Read Only

Leaving Air Temp Sensor 2

AI:7 The current Leaving Air Sensor 2 Temperature

Read Only

Leaving Air Average Temp

AI: 8 The current Average Leaving Air Temperature

Read Only

Reset Input Percentage

AI:9 The current Setpoint Reset Input Percentage

Read Only

Enable Input Value

BI: 1 The current value of the Enable Binary Input

Read Only0 = Off1 = On

Shutdown Input Value

BI: 2 The current value of the Emergency Shutdown

Binary Input


Preheat Enable Status

BI: 3 The current Enable status of the controller


Alarm Relay Status

BI: 4 The current status of the Alarm Relay


Heat 1 Relay Status

BI: 5 The current status of the Heat 1 Relay


Heat 2 Relay Status



Heat 3 Relay Status



Heat 4 Relay Status



Heat 5 Relay Status



Heat 6 Relay Status



BACnet® Properties for the PREHEAT-X-EXTPARAMETER OBJECT DESCRIPTION LIMITS

Emergency Shutdown

Alarm

BI: 11 The current Emergency Shutdown Alarm status


Leaving Air Sensor 1 Alarm

BI: 12 The current Leaving Air Sensor 1 Alarm status


Leaving Air Sensor 2 Alarm

BI: 13 The current Leaving Air Sensor 2 Alarm status


Low Leaving Air Temp

Alarm

BI: 14 The current Low Leaving Air Temp Alarm status


High Leaving Air Temp

Alarm

BI: 15 The current High Leaving Air Temp Alarm status

Read Only 0 = Off1 = On

Entering Air Sensor Alarm

BI: 16 The current Entering Air Sensor Alarm status


Remote Enable AV: 1 Enables the Preheat from the BACnet front end

Read / Write Volatile

0 = Disabled1 = Enabled

Remote Leaving Air

Setpoint

AV: 2 Controlling Leaving Air Setpoint from the BACnet

front end

Read/ Write Volatile

35.0 ºF 90.0 ºF

Remote Entering

Air Enable Setpoint

AV: 3 Entering Air Enable Setpoint from the BACnet

Front end

Read / Write Volatile

-40.0 ºF

90.0 ºF

PREHEAT-X-EXT BACnet® Property Identifi er

BACNETPropertyIdentifi er :

AllAlarmGroup1Bits ::= BIT STRING {Reserved (0),BadLeavingAir1 (1),BadLeavingAir2 (2),LowLeavingAir (3),HighLeavingAir (4),Reserved (5),BadEnteringAir (6),CommAlarm (7),ShutDownAlarm (8)


NOTES

27

2425 So. Yukon Ave • Tulsa, OK • 74107-2728Ph: (918) 583-2266 • Fax: (918) 583-6094

AAON® Part No.: V97760WM Form: AA-PREHEATX-EXT-TGD-01A • Printed in the USA

Copyright May 2017 WattMaster Controls, Inc.•

Documents

PREHEAT-X-EXT Controller Technical GuideOVERVIEW 4 PREHEAT-X-EXT Technical Guide Overview The OE377-26-00061-1 PREHEAT-X-EXT Controller (AAON Part No. V48511) is designed to control