AAON PREHEAT-X Series Module Controller

Specifications Product

• Model: PREHEAT-X Module
• Controllers: VCCX-IP, VCCX2, VCB-X, VCM-X E-BUS
• Sensors: Air Temperature Sensor, Outside Air Sensor
• Cable Assembly: E-BUS Cable Assembly
• Power & Comm Cable Lengths: 1.5 Ft, 3 Ft, 10 Ft, 25 Ft, 50 Ft, 75 Ft, 100 Ft, 150 Ft, 250 Ft, and 1000 Foot Spool

Talîmatên Bikaranîna Product

Agahiyên Giştî
The PREHEAT-X Module is designed to regulate temperature in HVAC systems. It works in conjunction with various controllers and sensors to maintain desired temperatures.

Ketin û Derketin
The module supports analog and binary inputs, analog outputs, and relays for precise control over the HVAC system. Refer to the user manual for detailed configuration options.

Rêza Operasyonên
The module offers different operation modes to suit various heating requirements. Users can select the appropriate mode based on their needs for efficient temperature control.

Çareserkirina pirsgirêkan
In case of issues, refer to the LED diagnostics section in the manual to identify problems. The module also features alarms toalert users of any malfunctions that may occur during operation.

PREHEAT-X REVISION LOG
REVIZION Û ROJK	GÛHERRANDIN
Rev. E, 16 Avrêl, 2021	Updated part numbers, alarms and alarm history, and labels. Added Figure/Table content pages, and Fahrenheit/Celsius temperature conversion. Corrected cosmetic errors.
Rev. F, February 2, 2024	updated screens, updated parts table, various cosmetic updates

PREHEAT-X PARTS REFERENCE
BİXWÎNE BİXWÎNE	HEJMARA PARÊ
Modula PREHEAT-X	ASM01688
Kontrolkera VCCX-IP	ASM07424
VCCX2 Controller	ASM01698
Kontrolkera VCB-X	ASM01862
Kontrolkera VCM-X E-BUS	V07151
Sensor Germahiya hewayê	G051240 (6 in.), G051250 (12 in.)
Sensorê hewayê derve	G042230
E-BUS Cable Assembly E-BUS Power & Comm 1.5 Ft, 3 Ft, 10 Ft, 25 Ft, 50 Ft, 75 Ft, 100 Ft, 150 Ft, 250 Ft, and 1000 Foot Spool	G029440 (1.5 Ft), G012870 (3 Ft), G029460 (10 Ft), G045270 (25 Ft), G029510 (50 Ft), G029530 (75 Ft), G029450 (100 Ft), G029470 (150 Ft), V36590 (250 Ft), G018870 (SPOOL)

Hemû destan jî ji bo daxistinê hene www.aaon.com/controlsmanuals.

• AAON
• 2425 South Yukon Ave. Tulsa, OK 74107-2728
• www.aaon.com
• Telefona Piştgiriya Teknîkî ya Fabrîkê: 918-382-6450
• Piştgiriya Kontrolên AAON: 866-918-1100
• Armanca AAON ew e ku agahdariya hilberê rast û heyî peyda bike. Lêbelê, di berjewendiya başkirina hilberê de, AAON mafê guheztina nirx, taybetmendî, û/an sêwirana hilberê xwe bêyî agahdarî, berpirsiyarî, an berpirsiyariyê diparêze.
• AAON P/N: G086640, Rev. F
• © February 2024 AAON Inc. All rights reserved throughout the world.
• AAON® is a registered trademark of AAON, Inc., Tulsa, OK. AAON assumes no responsibility for errors or omissions in this document.
• Ev belge bêyî agahdarî dikare were guhertin.

SERVIEW

• The PREHEAT-X is designed to control fixed stages of Preheat and optional modulating Preheat to maintain a desired Preheat Leaving Air Temperature Setpoint. See Figure 1, this page for dimensions. See Figure 2 and 3, pages 7 and 8 for wiring details.

Features
The PREHEAT-X has the following features:

• Can be operated as a stand-alone module or communicating with the VCCX2 or other AAON unit controllers.
• Monitors the Preheater Leaving Air Temperature and Leaving Air Reset Signal and controls to maintain the setpoint
• Contains a 2 x 8 LCD character display and four buttons that allow for status display and setpoint changes

NOT: The PREHEAT-X contains no user-serviceable parts. Contact qualified technical personnel if your PREHEAT-X is not operating correctly.

WIRING

Nîqaşên Girîng Wiring

Divê modul bi çavkaniyek hêzê ya 18-30 VAC ve girêdayî bin ku ji bo hewcedariyên barkirina VA ya hesabkirî mezinahiya guncaw be. Divê hemî mezinahiyên transformatoran li gorî nirxandinên VA yên ku di Tabloya 1, vê rûpelê de hatine navnîş kirin, werin çêkirin.

Kontrol Sazî	Voltage	VA Load	Germahiya xebitandinê	Humidity (Non- Condensing)
PREHEAT-X	18-30 VAC	18	-22°F heta 158°F* -30ºC to 70ºC*	0-95% RH
	Inputs		Resistive Inputs require 10KΩ Type III Thermistor
			24 VAC Inputs provide 4.7KΩ Dawetkirin
	Derketin		Derketinên Relayê: 1 amp herî zêde ji bo her derketinê.

Table 1: PREHEAT-X Electrical and Environmental Requirements

NOT: If the temperature at the PREHEAT-X is below -22ºF (-30ºC), the display refresh rate could be less responsive.

GAZÎ: When using a single transformer to power more than one controller or expansion module, the correct polarity must always be maintained between the boards. Failure to observe correct polarity will result in damage to the AAON unit controller, PREHEAT-X, and any associated module.

Please carefully read and apply the following information when wiring the AAON unit controller, PREHEAT-X and any associated module.

1. Divê hemû têlkirin li gorî rêzikname û pîvanên elektrîkê yên herêmî û neteweyî bin.
2. 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 controller and connected devices.
3. Minimum wire size for 24 VAC wiring should be 18- gauge.
4. Minimum wire size for all sensors should be 24-gauge. Some sensors require two-conductor wire and some require three-or four-conductor wire.
5. Minimum wire size for 24 VAC thermostat wiring should be 22-gauge.
6. Be sure that all wiring connections are properly inserted and tightened into the terminal blocks. Do not allow wire strands to stick out and touch adjoining terminals which could potentially cause a short circuit.
7. When communication wiring is to be used to interconnect AAON unit controllers together or to connect to other communication devices, all wiring must be plenum-rated, minimum 18-gauge, two-conductor, twisted-pair with shield. AAON can supply communication wire that meets this specification and is color coded for the network or local loop. Please consult your AAON distributor for information. If desired, Belden #82760 or equivalent wire may also be used.
8. Before applying power to the AAON unit controller, PREHEAT-X, and any associated modules, be sure to recheck all wiring connections and terminations thoroughly.

Powering Up
When the controller and modules are first powered up, the POWER LED should light up and stay on continuously. If it does not light up, check to be sure that you have 24 VAC connected to the controller, that the wiring connections are tight, and that they are wired for the correct polarity. The 24 VAC power must be connected so that all ground wires remain common. If after making all these checks, the POWER LED does not light up, please contact AAON Controls Support for assistance.

Inputs Wiring

Inputs 
The PREHEAT-X works as a stand-alone module or comm-unicating with the VCCX2 or other AAON unit controllers. For connection to the PREHEAT-X use an E-BUS Cable connecting to the appropriate E-BUS ports. The Reset Input and Heat Enable are only used in Stand-Alone Mode. See Figure 2, this page for the Inputs Wiring Diagram.

Têlên Derketinan

Derketin 
The PREHEAT-X works as a stand-alone module or communicating with the VCCX2 or other AAON unit controllers. For connection to the PREHEAT-X, use an E-BUS Cable connecting to the appropriate E-BUS ports. See Figure 3, this page for the Outputs Wiring.

KÊN Û DERKETIN

Analog and Binary Inputs, Analog Outputs and Relays

Inputên Analog
1	Leaving Air Temperature 1 (LAT1)
2	Leaving Air Temperature 2 (LAT2)
3	Entering Air Temperature Sensor
4	Reset In (0-10 VDC)
Têketinên Binary
1	Heat Enable
2	Girtina Awarte
3	Bikaranîna Pêşerojê
Hilberên analog
1	0-10 VDC Mod SCR
2	PWM SSR
Relays
1	Hawar
2	Germ 1
3	Germ 2
4	Germ 3
5	Germ 4
6	Germ 5
7	Germ 6

Table 2: PREHEAT-X Inputs and Outputs

Nexşeya I/O

See Table 2, this page to reference the inputs and outputs that are available on the PREHEAT-X.

Inputên Analog

• Leaving Air Temperature 1 (LAT1)
  When enabled, the PREHEAT-X will control to a Leaving Air Temperature (LAT) setpoint. The PREHEAT-X can be configured to use only LAT1 for this purpose. Typically, the average of LAT1 and LAT2 is used.
• Leaving Air Temperature 2 (LAT2)
  When enabled, the PREHEAT-X will control to a Leaving Air Temperature Setpoint. It can be configured to use only LAT2 for this purpose. Typically, the average of LAT1 and LAT2 is used.
• Ketina Germahiya hewayê
  When the Entering Air Temperature falls below the Entering Air Temperature Setpoint, preheat will be enabled.

NOT: For AI1 through AI3, all temperature sensors must be Thermistor Type III Temperature Sensors, which provide 77.0ºF @ 10K ohms resistance.

Reset Input (0-10 VDC)
When the PREHEAT-X is used as a stand-alone module, 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.

Têketinên Binary

• Heat Enable Contact (HEAT EN)
  This input is only required when the PREHEAT-X is used as stand-alone module; it is not required when communicating with an AAON unit controller. The Heat Enable input is activated by a 24 VAC signal supplied from a building automation system to enable the PREHEAT-X. The module will not operate without 24 VAC being applied to this input terminal when used as a stand-alone module. When the Heat Enable signal is lost or turned off, all stages deactivate immediately.
• Input Shutdown Awarte
  This wet contact (24 VAC) input is used to initiate shutdown of the HVAC unit when a N.C. Smoke Detector (by others), Firestat (by others), or other shutdown condition (by others) occurs and the contact is opened. The PREHEAT-X remains active and can initiate alarm relays.

Hilberên analog

• 0-10 VDC Modulating SCR
  Depending 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.

Derketinên Relay

• Relay #1 – Alarm
  This relay sends a signal when an alarm is enabled.
• Relays #2 – 7
  These relays are Fixed Stage Heat Outputs.

REWA KARAN

Modes Operasyonê 
The PREHEAT-X can be used as a stand-alone module or communicating with an AAON unit controller using a modular cable.

Moda Stand-Alone
When used in Stand-Alone Mode, the PREHEAT-X will modulate SCR or SSR Heat and stage any additional fixed stages to maintain the Leaving Air Temperature Setpoint configured on the PREHEAT-X LCD display. The PREHEAT-X is activated by a 24 VAC signal to the HEAT EN input.

Moda Ragihandinê

• When the PREHEAT-X 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 AAON unit controller to properly operate in the Heating Mode.
• If the communication is interrupted between the PREHEAT-X and the AAON unit 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 configuration, the Leaving Air Temperature Setpoints and the Preheat Enable Sepoints are set using the main AAON unit controller.

Pregerim Çalak bike

Moda Stand-Alone
Enabled when the Binary Input is closed and the Entering Air Temperature is below setpoint.

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

BACnet Communications Mode
Enabled by BACnet® command or Binary Input, whichever occurs first.

Leaving Air Sensor 
The PREHEAT-X can be configured to use one of three sensor configurations 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 configured, the Modulating Heat Output will be used as the first stage ji germê.
• Analog Voltage Output can be adjusted between 0-10 VDC as needed to maintain the Leaving Air Setpoint.
• Controlled by an Internal PID Loop.

Germiya Staging Up
The following conditions must be met before the first (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 configured, it must be at 100% for the Stage Up Delay.
• The Minimum Off Time must be met.
• Stage Up Delay must be met (for second stage and above).

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

• Preheat Enable Signal/Command is deactivated -ORthe LAT must be above the LAT Setpoint by the LAT Deadband.
• If Modulating Heat is configured, it must be at 0% for the Stage Down Delay.
• The Minimum Run Time must be met.
• Stage Down Time must be met.

Girtina Awarte
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 two minutes, the heat will remain on but an alarm will be generated.

LCD SCREENS

Keys Navîgasyon

LCD Display Screen & Navigation Keys
Ekran û bişkokên LCD-ê dihêle hûn view status and alarms, and enable force modes. See Figure 4, this page and refer to Table 3 and 4, this page for descriptions.

LCD SCREENS

Nexşeya Dîmenderên Sereke

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

• Rojnamevanî to scroll through PREHEAT-X Screens.
• Rojnamevanî to go to STATUS Screens.

• Rojnamevanî to scroll through STATUS Screens.
• Rojnamevanî to go to SETPOINTS Screens.

• Rojnamevanîto scroll through SETPOINTS Screens.
• Rojnamevanî to go to ALARMS Screens.

• Rojnamevanî to scroll through ALARMS Screens.
• Rojnamevanî to go to CONFIG Screens.

• Rojnamevanî to scroll through CONFIG Screens.
• Rojnamevanî to go to COMM CONFIG Screens.

• Rojnamevanî to scroll through COMM CONFIG Screens.

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

Setpoint Screens
Refer to the following map when navigating through the Setpoint 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.

NOT: 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.

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.

Kêmtirîn	Destçûnî	Zêdetir
0ºF	70ºF	90ºF
-17.7ºC	21ºC	32ºC

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 Voltage Input is at 10 VDC.

Kêmtirîn	Destçûnî	Zêdetir
0ºF	70ºF	120ºF
-17.7ºC	21ºC	48.8ºC

ENTERING AIR 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 AAON unit controller in Communications Mode.

Kêmtirîn	Destçûnî	Zêdetir
-40ºF	55ºF	90ºF
-40ºC	12.7ºC	32ºC

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.

Kêmtirîn	Destçûnî	Zêdetir
-100ºF	0ºF	100ºF
-55.5ºC	0ºC	55.5ºC

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.

Kêmtirîn	Destçûnî	Zêdetir
-100ºF	0ºF	100ºF
-55.5ºC	0ºC	55.5ºC

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.

Kêmtirîn	Destçûnî	Zêdetir
-100ºF	0ºF	100ºF
-55.5ºC	0ºC	55.5ºC

Dîmendera Alarman

• Refer to the following map when viewing the ALARMS Screens. These screens will display automatically when alarms are present. For alarm troubleshooting, see pages 22-23.

ALARMS
The alarms are as follows:

• NO ALARMS: This will be shown if there are no current alarms.
• E-SHUTDN: If 24 VAC 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 first 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.
• 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.
• LOW LAT: This indicates a Leaving Air Temperature Cutoff alarm condition which is activated if the Controlling Leaving Air Temperature has dropped below 35ºF for more than two minutes. The alarm will be disabled if after a fixed 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 disconnected, 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.

Configuration Screens

• Refer to the following map when navigating through the Configuration 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.

LCD SCREENS

Communication Configuration Screens

• Refer to the following map when navigating through the Communication Configuration Screens. From the COMM 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.

Pirsgirêkan

Giştî 
The PREHEAT-X is equipped with LEDs that can be used to verify operation and perform troubleshooting. See Figure 6, this page 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:

• LEDATN STATUSYA
  POWER – This green LED will light up to indicate that 24 VAC power has been applied to the controller.
• LED-yên teşxîsker
  ALARM – This red LED located on the PREHEAT-X’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.

Têkilî LED
COMM – This yellow LED will light up and blink when communications are detected.

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

LED-ên Têketina Dualî

• HEAT EN – This green LED will light up when Heat is enabled.
• EMERGENCY SHUTDOWN – This green LED will light up when Emergency Shutdown input has 24 VAC applied to it.

Alarms

Pirsgirêkên Alarm

Mechanical Failure:

• Check relay outputs on the PREHEAT-X for 24 VAC output.
• Verastkirina voltage (VOUT and GND) to SCR or PWM.
• Verify that the Leaving Air Temperature Sensor(s) is connected to AI1 and/or AI2 and GND on the PREHEAT-X.
• Verify Leaving Air Temperature Sensor probe(s) is mounted correctly.
• Remove AI1 and AI2 and GND wiring from the PREHEAT-X and ohm out the sensor (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 AI1 and/or AI2 and GND on the PREHEAT-X.
• Remove AI1 and AI2 and GND wiring from the PREHEAT-X and ohm out the sensor (this may indicate open or failed wiring). Refer to chart in back of this guide for readings.

Communications Loss:

• Check COMM LED on PREHEAT-X.
• Verify 24 VAC power to all interconnected controllers.
• Verify connection between the PREHEAT-X and associated controllers.
• In Communications Mode (connected with a modular cable), verify PREHEAT-X configuration on controller.

Mounting the Leaving Air Temperature Sensor

• The Leaving Air Temperature (LAT) sensor should be located in the 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 inch 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.

GAZÎ:
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.

APPENDIX A: LAT SENSOR

Leaving Air Temperature Sensor

• If you suspect the Entering or 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 AI terminal and the negative probe on the GND terminal. Read the DC Volts and find that voltage in Table 5, this page.
• 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.

Rêwerzên Testkirina Sensorê Termîstorê

• 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 5, this page.

Rêwerzên Testkirina Sensorê Termîstorê

1. Ji bo kontrolkirina sensora termîstorê dema ku ji kontrolkeran veqetandî ye (ne bi elektrîkê ve girêdayî ye), stûna berxwedanê bikar bînin.
2. Volê bikar bînintagstûna e ji bo kontrolkirina sensoran dema ku bi kontrolkerên bi hêz ve girêdayî ne. Cildê bixwînetage bi pîvanê li ser voltaja DC hatî danîn. Kabloya "-" (kêm) li ser termînala GND û kabloya "+" (plus) li ser termînala têketina sensorê ya ku tê lêkolînkirin deynin.

Temperature to Resistance/Voltage Chart
Temp (°F)	Temp (°C)	Berxwedan (Ohm)	Voltage @ Têketin (VDC)	Temp (°F)	Temp (°C)	Berxwedan (Ohm)	Voltage @ Têketin (VDC)
-10	-23.3	93333	2.98	72	22.2	11136	1.74
-5	-20.6	80531	2.94	73	22.8	10878	1.72
0	-17.8	69822	2.89	74	23.3	10625	1.70
5	-15	60552	2.83	75	23.9	10398	1.68
10	-12.2	52500	2.77	76	24.4	10158	1.66
15	-9.4	45902	2.71	78	25.6	9711	1.63
20	-6.6	40147	2.64	80	26.7	9302	1.59
25	-3.9	35165	2.57	82	27.8	8893	1.55
30	-1.1	30805	2.49	84	28.9	8514	1.52
35	1.7	27140	2.41	86	30	8153	1.48
40	4.4	23874	2.33	88	31.1	7805	1.45
45	7.2	21094	2.24	90	32.2	7472	1.41
50	10	18655	2.15	95	35	6716	1.33
52	11.1	17799	2.11	100	37.8	6047	1.24
54	12.2	16956	2.08	105	40.6	5453	1.16
56	13.3	16164	2.04	110	43.3	4923	1.09
58	14.4	15385	2.00	115	46.1	4449	1.02
60	15.6	14681	1.96	120	48.9	4030	.95
62	16.7	14014	1.93	125	51.7	3656	.88
64	17.8	13382	1.89	130	54.4	3317	.82
66	18.9	12758	1.85	135	57.2	3015	.76
68	20	12191	1.81	140	60	2743	.71
69	20.6	11906	1.79	145	62.7	2502	.66
70	21.1	11652	1.78	150	65.6	2288	.61
71	21.7	11379	1.76

Not: Ger cildtage 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.

Tabloya 5: Sensora Germahiya 0-3V – Voltage & Resistance for Type III Sensors

APPENDIX B: BACnet®

Connection to MS/TP Network

TIŞT	PARAMETAR	TERÎF	LIMITS
AI: 1	Active Controlling Setpoint	The current Active Controlling Setpoint	Tenê bixwînin
AI: 2	Hejmara Germiya Stages On	The current number of heat stages on	Tenê bixwînin
AI: 3	Modulating Output Position	The current Modulating Output Position	Tenê bixwînin
AI: 4	All Alarms Bitfield	The current Alarm Status in a Bitfield	Read Only, see alarm bits, page 27
AI: 5	Ketina Germahiya hewayê	The current Entering Air Temperature	Tenê bixwînin
AI: 6	Leaving Air Temp Sensor 1	The current Leaving Air Sensor 1 Temperature	Tenê bixwînin
AI: 7	Leaving Air Temp Sensor 2	The current Leaving Air Sensor 2 Temperature	Tenê bixwînin
AI: 8	Leaving Air Average Temp	The current Average Leaving Air Temperature	Tenê bixwînin
AI: 9	Reset Input Percentage	The current Setpoint Reset Input Percentage	Tenê bixwînin
BI: 1	Enable Input Value	The current value of the Enable Binary Input	Read Only, 0 = Off, 1 = On
BI: 2	Shutdown Input Value	The current value of the Emergency Shutdown Binary Input	Read Only, 0 = Off, 1 = On
BI: 3	Preheat Enable Status	The current Enable status of the controller	Read Only, 0 = Off, 1 = On
BI: 4	Alarm Relay Status	The current status of the Alarm Relay	Read Only, 0 = Off, 1 = On
BI: 5	Heat 1 Relay Status	The current status of the Heat 1 Relay	Read Only, 0 = Off, 1 = On
BI: 6	Heat 2 Relay Status	The current status of the Heat 2 Relay	Read Only, 0 = Off, 1 = On
BI: 7	Heat 3 Relay Status	The current status of the Heat 3 Relay	Read Only, 0 = Off, 1 = On
BI: 8	Heat 4 Relay Status	The current status of the Heat 4 Relay	Read Only, 0 = Off, 1 = On
BI: 9	Heat 5 Relay Status	The current status of the Heat 5 Relay	Read Only, 0 = Off, 1 = On
BI: 10	Heat 6 Relay Status	The current status of the Heat 6 Relay	Read Only, 0 = Off, 1 = On
BI: 11	Emergency Shutdown Alarm	The current Emergency Shutdown Alarm status	Read Only, 0 = Off, 1 = On
BI: 12	Leaving Air Sensor 1 Alarm	The current Leaving Air Sensor 1 Alarm status	Read Only, 0 = Off, 1 = On
BI: 13	Leaving Air Sensor 2 Alarm	The current Leaving Air Sensor 2 Alarm status	Read Only, 0 = Off, 1 = On
BI: 14	Low Leaving Air Temp Alarm	The current Low Leaving Air Temp Alarm status	Read Only, 0 = Off, 1 = On
BI: 15	High Leaving Air Temp Alarm	The current High Leaving Air Temp Alarm status	Read Only, 0 = Off, 1 = On
BI: 16	Entering Air Sensor Alarm	The current Entering Air Sensor Alarm status	Read Only, 0 = Off, 1 = On
AV: 1	Remote Enable	Enables the Preheat from the BACnet® front end	Read / Write Volatile
			0 = Neçalak, 1 = Çalak
AV: 2	Remote Leaving Air Setpoint	Controlling Leaving Air Setpoint from the BACnet® front end	Read/ Write Volatile
			35.0 ºF	90.0 ºF
AV: 3	Remote Entering Air Setpoint	Entering Air Enable Setpoint from the BACnet® front end	Read / Write Volatile
			-40.0 ºF	90.0 ºF

PREHEAT-X BACnet® Property Identifier

BACNETPropertyIdentifier : 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 G086640 · Rev. F · 240202

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• AAON P/N: G086640, Rev. F
• Printed in the USA • Copyright February 2024 • All Rights Reserved

FAQs

Belge / Çavkanî

AAON PREHEAT-X Series Module Controller [pdf] Rehbera bikaranînê VCCX-IP Controller, VCCX2 Controller, VCB-X Controller, VCM-X E-BUS Controller, ASM01688, ASM07424, ASM01698, ASM01862, PREHEAT-X Series Module Controller, PREHEAT-X Series, Module Controller, Controller

Çavkanî

• Manual Bikarhêner