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PREHEAT-X Controller Technical Guide
Factory Packaged Controls
PART NUMBER CROSS REFERENCE TABLE
PART DESCRIPTION ORION AAON TULSA
AAON COIL
PREHEAT-X Controller OE377-26-00061 V48510 V48510VCCX2 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: mail@wattmaster.comVisit our web site at www.orioncontrols.comWattMaster Form: AA-PREHEATX-TGD-01D
AAON® Manual Part No.: V48520Copyright June 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.
www.aaon.com
PREHEAT-X 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 BACnet ..................................................................... 25PREHEAT-X BACnet MS/TP Connection .............................................................................................. 25PREHEAT-X BACnet Points .................................................................................................................. 26
OVERVIEW
PREHEAT-X Technical Guide 4
Overview
The OE377-26-00061 PREHEAT-X Controller (AAON Part No. V48510) is designed to control fi xed stages of Preheat and optional modulating Preheat to maintain a desired Preheat Leaving Air Tem-perature Setpoint. See Figure 1 for dimensions.
The controller can be used as a stand-alone controller or communi-cating with an AAON Unit Controller. The PREHEAT-X controller connects to an AAON unit controller via a modular cable. See Figure 2, page 5 for wiring details.
General Information
Figure 1: OE377-26-00061 PREHEAT-X Controller Dimensions (In Inches)
Features
The PREHEAT-X 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
• Contains a 2 x 8 LCD character display and 4 buttons that allow for status display and setpoint changes
NOTE: The PREHEAT-X Controller contains no user-serviceable parts. Contact qualifi ed technical personnel if your PREHEAT-X 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
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
Rev.: 1D#S 000062W
E-BUSCONNECT
E-BUSCONNECT
LAT1
0-10V RESET
LAT2
EAT
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(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
PREHEAT-X Technical Guide
WIRING
5
Important Wiring Considerations
Important Wiring Considerations
Please read carefully and apply the following information when wiring the PREHEAT-X Controller. The PREHEAT-X 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
PREHEAT-X Technical Guide 6
Inputs Wiring
Figure 2: PREHEAT-X 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 -
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
+2
4V
AC
GN
D
www.orioncontrols.com
www.aaon.com
ENABLE
T(-)
EMERG. SHUTDOWN
SHLD
FUTURE USE
R(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
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 CONTROLLER(OE377-26-00061)
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
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
Rev.: 1D#S 000062W
E-BUSCONNECT
E-BUSCONNECT
LAT1
0-10V RESET
LAT2
EAT
GND
GND
ANALOG INPUTS
BINARY INPUTS
RS-485 COMM
+24 V
AC
GN
D
www.aaon.com
ENABLE
T(-)
EMERG. SHUTDOWN
SHLD
FUTURE USE
R(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
Size Transformer ForCorrect Total Load.PREHEAT-X-EXTController = 11 VA
Inputs Wiring
The PREHEAT-X Controller works as Stand-Alone or communicat-ing with the VCCX2, VCC-X, VCB-X, VCM-X E-BUS Controller. For connection to the controller, use an E-BUS Cable connecting to the appropriate E-BUS ports on the controller. The Reset Input and Heat Enable are only used in Stand-Alone Mode. See Figure 2 below for Inputs Wiring.
PREHEAT-X Technical Guide
WIRING
7
Outputs Wiring
Figure 3: PREHEAT-X Outputs Wiring Diagram
Outputs Wiring
The PREHEAT-X Controller works as Stand-Alone or communicat-ing with the VCCX2, VCC-X, VCB-X, VCM-X E-BUS Controller. For connection to the controller, use an E-BUS Cable connecting to the appropriate E-BUS ports on the controller. See Figure 3 below for the 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 -
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
+2
4V
AC
GN
D
www.orioncontrols.com
www.aaon.com
ENABLE
T(-)
EMERG. SHUTDOWN
SHLD
FUTURE USE
R(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
Line
GN
D
24V
AC
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 CONTROLLER(OE377-26-00061)
EBC E-BUS CableConnects To
VCCX2, VCC-X Or VCB-XController’s
Expansion Port
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
Rev.: 1D#S 000062W
E-BUSCONNECT
E-BUSCONNECT
LAT1
0-10V RESET
LAT2
EAT
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(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
HSSC E-BUS CableConnects To
VCM-X Controller’sExpansion Port
RelayContact
+
+
–
–
Size Transformer ForCorrect Total Load.PREHEAT-X-EXTController = 11 VA
INPUTS & OUTPUTS
PREHEAT-X Technical Guide8
Inputs and Outputs
Table 1: PREHEAT-X Controller Inputs & Outputs
Analog Inputs
Leaving Air Temperature 1 (LAT1)When enabled, the PREHEAT-X Controller will control to a Leav-ing 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 Controller will control to a Leav-ing 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 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 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
PREHEAT-X Technical Guide
OPERATION MODES
9
Outputs and Operation Modes
Operation Modes
The PREHEAT-X Controller can be used stand-alone or communicat-ing with an AAON Unit Controller using a modular cable.
Stand-Alone ModeWhen used in a stand-alone application, the PREHEAT-X Controller will modulate SCR or SSR Heat and stage any additional fi xed stages to maintain the Leaving Air Temperature setpoint confi gured on the PREHEAT-X Controller LCD display. The PREHEAT-X Controller is activated by a 24VAC signal to the HEAT EN input.
Communicating ModeWhen the PREHEAT-X Controller is connected and communicating with an AAON Unit Controller via a modular cable, the necessary information will be passed between the PREHEAT-X and the Main Unit Controller to properly operate in the Heating Mode.
If the communication is interrupted between the PREHEAT-X Controller and the Main Controller, both boards will show an alarm and the PREHEAT-X outputs will turn off. When communication 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 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 Sensor
The controller can be confi gured to use one of three sensor confi gu-rations for control.
• Leaving Air Sensor 1 only (LAT1)
• Leaving Air Sensor 2 only (LAT2)
• Average Leaving Air Temperature which averages LAT1 and LAT2
Leaving Air 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 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
PREHEAT-X Technical Guide 12
Navigation Keys
LCD Display Screen & Navigation Keys
The PREHEAT-X Controller allows you to make confi guration 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 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.
PREHEAT-X Technical Guide
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
SOFTWAREVER 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 Main Screens Map
EBUS CFGVCB-X
LA1 CAL0.0
LA2 CAL0.0
EA CAL0.0
MOD Kd4.0
LCD DISPLAY SCREENS
PREHEAT-X Technical Guide 14
PREHEAT-X Main Screens
PREHEAT-X 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.
PREHEAT-X Technical Guide
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,
or (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 or 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#
SOFTWAREV.XXX
CURRENT SOFTWARE VERSION
Displays the current software version installed in the controller.
LCD DISPLAY SCREENS
PREHEAT-X Technical Guide 16
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 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 Maximum35°F1.6°C
70°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°C
70°F°C
120°F°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
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
PREHEAT-X Technical Guide
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 35ºF for more than 2 minutes. The alarm will be disabled if after a fi xed delay period the Leaving Air Temperature has risen above 35ºF.
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
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
LCD DISPLAY SCREENS
PREHEAT-X Technical Guide 18
Confi guration 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.
PREHEAT-X Technical Guide
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.
Confi guration Screens
LCD DISPLAY SCREENS
PREHEAT-X Technical Guide 20
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 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.
PREHEAT-X Technical Guide
TROUBLESHOOTING
21
LED Diagnostics & Alarms
LED DiagnosticsThe PREHEAT-X 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 Controller’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 Controller LED Locations and Descriptions
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
Rev.: 1D#S 000062W
E-BUSCONNECT
E-BUSCONNECT
LAT1
0-10V RESET
LAT2
EAT
GND
GND
ANALOG INPUTS
BINARY INPUTS
RS-485 COMM
+24 V
AC
GN
D
www.aaon.com
ENABLE
T(-)
EMERG. SHUTDOWN
SHLD
FUTURE USE
R(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
OS LEDWDOG LED
APP LED
STAT LED
ALARM LED
HEAT ENABLE LED
COMM LED
EMERGENCYSHUTDOWN LED
ALARM LED
TROUBLESHOOTING
PREHEAT-X Technical Guide 22
Troubleshooting Alarms
Mechanical Failure:• Check relay outputs on the PREHEAT-X 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
• Verify Leaving Air Temperature Sensor probe(s) is mounted correctly
• Remove AIN1 and AIN2 and GND wiring from the PREHEAT-X 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.
• Remove AIN1 and AIN2 and GND wiring from the PREHEAT-X 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.
• Verify 24 VAC power to all interconnected WattMaster controllers.
• Verify connection between the PREHEAT-X and associated WattMaster controllers.
• In communication mode (connected to a an AAON Unit with modular cable), verify PREHEAT-X confi guration on AAON unit.
PREHEAT-X Technical Guide
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 box’s output location.
• Locate the sensor in the center of the widest part of the PREHEAT-X 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 Controller. See Figure 2 on page 5 fordetails.
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
PREHEAT-X Technical Guide 24
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.
PREHEAT-X Technical Guide
APPENDIX B
25
PREHEAT-X BACnet® Connection To MS/TP Network
Figure 8: PREHEAT-X 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
Size Transformer ForCorrect Total Load.PREHEAT-X Controller =11 VA
PREHEAT-XCONTROLLER
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 -
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
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
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(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
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
Rev.: 1D#S 000062W
E-BUSCONNECT
E-BUSCONNECT
LAT1
0-10V RESET
LAT2
EAT
GND
GND
ANALOG INPUTS
BINARY INPUTS
RS-485 COMM
+24 V
AC
GN
D
www.aaon.com
ENABLE
T(-)
EMERG. SHUTDOWN
SHLD
FUTURE USE
R(+)
CONTACT RATING IS1 AMP MAX@ 24 VAC
www.orioncontrols.com
MSTPBACnet
APPENDIX B
PREHEAT-X Technical Guide 26
PREHEAT-X BACnet® Points
BACnet® Properties for the PREHEAT-XPARAMETER 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
Read Only0 = Off1 = On
Preheat Enable Status
BI: 3 The current Enable status of the controller
Read Only0 = Off1 = On
Alarm Relay Status
BI: 4 The current status of the Alarm Relay
Read Only0 = Off1 = On
Heat 1 Relay Status
BI: 5 The current status of the Heat 1 Relay
Read Only0 = Off1 = On
Heat 2 Relay Status
BI: 6 The current status of the Heat 2 Relay
Read Only0 = Off1 = On
Heat 3 Relay Status
BI: 7 The current status of the Heat 3 Relay
Read Only0 = Off1 = On
Heat 4 Relay Status
BI: 8 The current status of the Heat 4 Relay
Read Only0 = Off1 = On
Heat 5 Relay Status
BI: 9 The current status of the Heat 5 Relay
Read Only0 = Off1 = On
Heat 6 Relay Status
BI: 10 The current status of the Heat 6 Relay
Read Only0 = Off1 = On
BACnet® Properties for the PREHEAT-XPARAMETER OBJECT DESCRIPTION LIMITS
Emergency Shutdown
Alarm
BI: 11 The current Emergency Shutdown Alarm status
Read Only0 = Off1 = On
Leaving Air Sensor 1 Alarm
BI: 12 The current Leaving Air Sensor 1 Alarm status
Read Only0 = Off1 = On
Leaving Air Sensor 2 Alarm
BI: 13 The current Leaving Air Sensor 2 Alarm status
Read Only0 = Off1 = On
Low Leaving Air Temp
Alarm
BI: 14 The current Low Leaving Air Temp Alarm status
Read Only0 = Off1 = On
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
Read Only0 = Off1 = On
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 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)
PREHEAT-X Technical Guide
NOTES
27
2425 So. Yukon Ave • Tulsa, OK 74107-2728Ph: (918) 583-2266 • Fax: (918) 583-6094
AAON® Manual Part No. V48520WattMaster Manual Form No: AA-PREHEATX-TGD-01D
www.aaon.com
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