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INPUTS & OUTPUTS

MODGAS-XWR2 Technical Guide

Inputs and Outputs

Table 1: MODGAS-XWR2 Inputs & Outputs

Analog Inputs

Reset Input (RST IN)

Used only in stand-alone operation. The Supply 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.

Supply Air Temperature Sensor (SAT)

Used only in stand-alone operation. The Supply Air Temperature Sen-

sor is the control source. This sensor has to be installed for the unit to

operate. The Supply Air Sensor is located in the discharge air stream and

monitors temperature to maintain the Supply Air Setpoint.

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 used as an expansion board to other

unit controllers. The Heat Enable input is activated by a 24VAC signal

supplied from a building automation system to enable the MODGAS-

XWR2 Controller. The controller will not operate without 24VAC being

applied to this input terminal when used in a stand-alone configuration.

I/O Map

The following inputs and outputs are available on the MODGAS-XWR2

Controller. See

Table 1

below

to reference the Input/Output Map.

ANALOG INPUTS

Reset Signal (RST IN)

Supply Temperature (SAT)

(AUX AIN) - Not Used

BINARY INPUTS

(AUX BIN) - Not Used

Heat Enable (HEAT EN)

Proof of Ignition 1 (PO-IGN1)

Proof of Ignition 2 (PO-IGN2)

COMMUNICATING OUTPUTS

Gas Valve 1

Gas Valve 2

RELAYS

Fan (RLY1)

Low Speed Fan (RLY2)

Heat 1 (RLY3)

Heat 2 (RLY4)

Heat 3 (RLY5)

Heat 4 (RLY6)

Proof of Ignition 1 (PO-IGN1)

The Proof of Ignition input is activated by a 24VAC signal supplied

from the Ignition Module to enable the modulating Gas Valve 1 (and

the modulating Gas Valve 2 in the 2V1IGN1S configuration). If the

flame does not ignite, the Ignition Module will turn off this enable.

The MODGAS-XWR2 Controller will then turn on the “No Proof of

Flame” alarm.

Proof of Ignition 2 (PO-IGN2)

The Proof of Ignition input is activated by a 24VAC signal supplied

from the Ignition Module to enable the modulating Gas Valve 2. If the

flame does not ignite, the Ignition Module will turn off this enable.

The MODGAS-XWR2 Controller will then turn on the “No Proof of

Flame” alarm.

Communicating Outputs

Gas Valve Output 1

This communicating output will control the modulating gas valve. It

can detect if the valve is connected and can verify the valve position.

Gas Valve Output 2

This communicating output will control the modulating gas valve. It

can detect if the valve is connected and can verify the valve position.

Relay Outputs

Relay #1 - Fan Enable

This relay works in conjunction with the Low Speed Fan Relay to

control the speed of the induced draft blower motor. When the MOD-

GAS-XWR2 Controller has heat enabled, this relay closes to bring the

induced draft blower on at high speed. The controller will activate the

Low Speed Fan Relay to reduce the induced draft blower speed as the

gas valve modulates closed.

Relay #2 - Low Speed Fan

Depending on the gas valve position, this relay will close to switch the

induced draft blower to low speed. The controller automatically switches

the blower to low speed as the gas valve modulates closed in order to

maintain proper fuel to air ratios.

Relay #3 - Heat 1

Once the MODGAS-XWR2 Controller brings on heat, Heat 1 Relay is

the first stage of heat.

NOTE:

In the 2 modulating valve, 2 ignitors, 1

stage configuration, Heat Relays #1 & #2 are one stage.

Relay #4 - Heat 2

Once the MODGAS-XWR2 Controller brings on heat, Heat 2 Relay is

the second stage of heat if the MODGAS-XWR2 is configured for two

stages of heat. Will either be a modulating heat stage or fixed heat stage.

NOTE:

In the 2 modulating valve, 2 ignitors, 1 stage configuration,

Heat Relays #1 & #2 are one stage.

Relay #5 - Heat 3

Once the MODGAS-XWR2 Controller brings on heat, Heat 3 Relay is

the second or third stage of heat if the MODGAS-XWR2 is configured

for three stages of heat. Will be a fixed heat stage.

Relay #6 - Heat 4

Once the MODGAS-XWR2 Controller brings on heat, Heat 4 Relay is

the third or fourth stage of heat if the MODGAS-XWR2 is configured

for four stages of heat. Will be a fixed heat stage.

Содержание MODGAS-XWR2

Страница 1: ...MODGAS XWR2 Controller Technical Guide Previously MODGAS XWR 1 MODGAS XWR2 MODGAS XWR 1 Code DT003795 001 SS1086 MODGAS XWR Code DT006331 001 SS1060 ...

Страница 2: ...ATURE SENSOR INSTALLATION 34 APPENDIX B MODGAS XWR2 REPLACEMENT OF THE MODGAS XWR 36 PART DESCRIPTION OLD PART NUMBER NEW PART NUMBER MODGAS XWR2 Controller previously referred to as the MODGAS XWR 1 V82790 ASM01695 MODGAS XWR Controller V20780 V20780 12 Relay E BUS Expansion Module R69180 ASM01873 VCCX2 Controller V87900 ASM01698 VCB X Controller V28940 ASM01862 Supply Air Temperature Sensor 6 12...

Страница 3: ...roller can replace the MODGAS XWR Controller See page 36 for drop in re placement instructions The controller can be used as a stand alone unit or be connected to a 12 Relay E BUS Expansion Module stand alone only or VCCX2 Controller VCB X Controller or VCM X E BUS I2 C Controller us ing a modular cable The MODGAS XWR2 Controller can be configured for one 1 modu lating valve with one ignitor as on...

Страница 4: ...at 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 and national electrical codes and specifications 6 Check all wiring leads at the terminal block for tightness Be sure that wire strands do not stick out and touch adjacent terminals Confirm that all transducers required for your ...

Страница 5: ...N Unit Controller Figure 9 page 12 This configuration is used to control one modulating valve which must be placed on the gas valve 1 header attached to Heat 1 Relay NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 2 3 4 below and up to 12 more additional fixed stages can be added by using the 12 Relay E BUS Expansion Module Figure 8 page 11 If using an MHGRV X Controller...

Страница 6: ...dulating gas valves one on each header in which the first valve is modulating stage 1 valve 1 header and the second valve is modulating stage 2 valve 2 header The first valve is attached to Heat Relay 1 and the second valve is at tached to Heat Relay 2 NOTE Up to 2 additional fixed heat stages can be used by using Heat Relays 3 4 below and up to 12 more additional fixed stages can be added by usin...

Страница 7: ...ion thus creating four modulating valves as 2 stages This configuration operates as Stand Alone Figure 4 below or communicating with an AAON Unit Controller Figure 12 page 15 NOTE Up to 2 additional fixed heat stages can be used by using Heat Relays 3 4 below and up to 12 more additional fixed stages can be added by using the 12 Relay E BUS Expansion Module Figure 8 page 11 If using a MHGRV X Cont...

Страница 8: ...h header in which the first and second valves operate together for one modulating stage Both valves are connected to Heat 1 Relay NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 2 3 4 below and up to 12 more additional fixed stages can be added by using the 12 Relay E BUS Expansion Module Figure 8 page 11 If using an MHGRV X Controller along with the MODGAS XW2 Controlle...

Страница 9: ...n thus creating four modulating valves as one stage This configuration operates as Stand Alone Figure 6 below or communicating with an AAON Unit Controller Figure 14 page 17 NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 2 3 4 below and up to 12 more additional fixed stages can be added by using the 12 Relay E BUS Expansion Module Figure 8 page 11 If using a MHGRV X Con...

Страница 10: ...used to control two modulating gas valves one on each header in which the first and second valves operate together for one modulating stage One valve is connected to Heat 1 Relay and the second valve is connected to Heat 2 Relay NOTE Up to 2 additional fixed heat stages can be used by using Heat Relays 3 4 below and up to 12 more additional fixed stages can be added by using the 12 Relay E BUS Exp...

Страница 11: ... 12 Relay E BUS Expansion Module to operate the Stand Alone setting in the LCD Configuration Screens must be set to Forced If communication is lost to the 12 Relay E BUS Expansion Module the 12 Relay E BUS Expansion Module will turn off its relays and the MODGAS XWR2 Controller will alarm and fall back to using only its onboard stages If communications is restored the MODGAS XWR2 Controller will b...

Страница 12: ...alve 1 header attached to Heat 1 Relay For VCM X Controllers use an I2 C Cable connecting to the appropriate I2 C port on the controller For all other controllers use an E BUS cable connecting to an E BUS port on the controller NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 2 3 4 below If additional fixed stages are required these should be configured and wired to the A...

Страница 13: ...ting stage One valve is connected to Heat 1 Relay and the second valve is connected to Heat 2 Relay For VCM X Controllers use an I2 C Cable connecting to the appropriate I2 C port on the controller For all other controllers use an E BUS cable connecting to an E BUS port on the controller NOTE Up to 2 additional fixed heat stages can be used by using Heat Relays 3 4 below If additional fixed stages...

Страница 14: ...e on each header in which the first valve is modulating stage 1 valve 1 header and the second valve is modulating stage 2 valve 2 header The first valve is attached to Heat Relay 1 and the second valve is at tached to Heat Relay 2 For VCM X Controllers use an I2 C Cable connecting to the appropriate I2 C port on the controller For all other controllers use an E BUS cable connecting to an E BUS por...

Страница 15: ... Figure 12 below is the Secondary por tion thus creating four modulating valves as two stages This configuration operates as Stand Alone Figure 4 page 7 or communicating with an AAON Unit Controller NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 3 4 below If additional fixed stages are required these should be configured and wired to the AAON Unit Controller s relays NO...

Страница 16: ... gas valves one on each header in which the first and second valves operate together for one modulating stage Both valves are connected to Heat 1 Relay NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 2 3 4 below If additional fixed stages are required these should be configured and wired to the AAON Unit Controller s relays For VCM X Controllers use an I2 C Cable connect...

Страница 17: ...d Figure 14 below is the Secondary por tion thus creating four modulating valves as one stage This configuration operates as Stand Alone Figure 6 page 9 or communicating with an AAON Unit Controller NOTE Up to 3 additional fixed heat stages can be used by using Heat Relays 3 4 below If additional fixed stages are required these should be configured and wired to the AAON Unit Controller s relays NO...

Страница 18: ...m Proof of Ignition 2 PO IGN2 The Proof of Ignition input is activated by a 24VAC signal supplied from the Ignition Module to enable the modulating Gas Valve 2 If the flame does not ignite the Ignition Module will turn off this enable The MODGAS XWR2 Controller will then turn on the No Proof of Flame alarm Communicating Outputs Gas Valve Output 1 This communicating output will control the modulati...

Страница 19: ...number of Heat Stages installed in the unit note that if there are two heat units to be operated in a primary secondary arrangement this is considered 1 stage of heat The fifth configuration screen selects the configuration The options for Stand Alone operation are 1 1 modulating 1 ignitor 1 stage 2 2 modulating 2 ignitors 1 stage 3 2 modulating 2 ignitors 2 stages which allows a secondary MODGAS ...

Страница 20: ... speed 2V2IGN2S The PID loop runs every 10 seconds and determines the modulation percentage for the one variable valve Then the valve moves to the correct position Only after the stage up delay requirement has been met will the board stage up and open the second variable valve After this both valves will move simultaneously to the same percent modulations During the modulation sequence if the valv...

Страница 21: ... but keep in mind that bringing one below the low speed cutoff and another above it will cause low speed relay difficulties Forcing stages 2 4 on forces Heat Relays 2 4 on respectively 2V1IGN1S Forcing stage 1 on forces Heat Relay 1 on and the next screen allows the option to select the modulation percentage since both valves are one stage they both modulate at the same percentage Forcing stages 2...

Страница 22: ...to turn Valve Force Mode off ENTER Use the Enter key to move through screens within Main Menu categories Also use this key to save setpoints and configuration changes Main Screens Map 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 MGAS XWR 1086vXXX STATUS MENU ALARM...

Страница 23: ...s a loss of communication for either E BUS master or slave or I2C the Controller moves into this mode This state re initializes communications and then puts the Controller into COMM_RECOVER mode Normal board operations do not continue when in this mode e g you cannot go into Heat mode COMM_RECOVER After the Controller moves into COMM_TIME OUT the Controller is then put into this mode The Controlle...

Страница 24: ...e Controller is being tested for the VCM X via I2C communications then the Controller moves into this mode MOD HEAT STAGE After Ignition Mode the unit will enter the Heat Mode and will begin to modulate the gas valve s to maintain the Heating Supply Air Setpoint SAT Once the call for heat goes away the unit will leave the Heat Mode SLAVE_HEATING If the Controller is a Modbus slave to another MODGA...

Страница 25: ...t Screens From the SETPOINT 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 WARNING The ENTER key must be pressed after changing setpoints for your entries to be saved for subsequent power ups NOTE When the MODGAS XWR2 is operating in Commu nications Mode these setpoints screens...

Страница 26: ... Force Mode back off or after 10 minutes of no keypad input the valve will go to zero and the relays will turn off STAGE 2 FORCE ON OFF DISABLED V2 POSITION X FORCE VALVE 2 PERCENTAGE This screen only appears when Valve 2 Force is on Press the UP button to turn the Force Mode on Press the DOWN button to turn the Force Mode off If the screen says disabled on off selection is not possible Press the ...

Страница 27: ... Heat 1 Relay Additional stages may be added to Heat Relays 2 3 4 or off board if in a communication mode 2V1IGN1S Valve configuration used to control two modulating gas valves one on each header in which the first and second valves operate together for one modulating stage Both valves are connected to Heat 1 Relay therefore an additional fixed stage may be added on board at the Heat 2 Relay Addit...

Страница 28: ...steps Default is 70 STG UP DLY 1 TO 10 m STAGE UP DELAY Range is 1 to 10 minutes Default is 3 IGN RTRY DLY 1 60 m IGNITION RETRY DELAY Range is 1 60 minutes Default is 30 STG DOWN DLY 1 TO 10 m STAGE DOWN DELAY Range is 1 or 10 minutes Default is 1 LOSAT SU 0 45 F LOW SUPPLY AIR TEMPERATURE START UP Range is 0 45ºF Default is 40ºF If the Supply Air Temperature is 40 adjustable or less the stage up...

Страница 29: ...1 Failure 10 Stage 2 Failure Table 4 ALARM LED Blink Codes Communication LED COMM This yellow LED will light up and blink when communications are detected If this LED never blinks then there is no communication Relay LEDs RLY1 This green LED will light up and stay lit as long as the Fan relay is active RLY2 This green LED will light up and stay lit as long as the Low Speed Fan relay is active RLY3...

Страница 30: ...TROUBLESHOOTING MODGAS XWR2 Technical Guide 30 Figure 16 MODGAS XWR2 Controller LED Locations and Descriptions Troubleshooting ...

Страница 31: ...D on the Main Controller communicating mode Remove SAT and GND wiring from MODGAS XWR2 and ohm sensor out this may indicate open or failed wiring Refer to chart on pages 30 31 of this guide for readings Verify the SAT OPTIONS jumper settings on the MODGAS XWR2 for the Supply Air Temperature Sensor Fail Mode SAT Cutoff Remove SAT and GND wiring from the MODGAS XWR2 and ohm sensor out this may indic...

Страница 32: ...5 0 60552 2 83 10 12 2 52500 2 77 15 9 4 45902 2 71 20 6 7 40147 2 64 25 3 9 35165 2 57 30 1 1 30805 2 49 35 1 6 27140 2 41 40 4 4 23874 2 33 45 7 2 21094 2 24 50 10 0 18655 2 15 52 11 1 17799 2 11 54 12 2 16956 2 08 56 13 3 16164 2 04 58 14 4 15385 2 00 60 15 6 14681 1 96 62 16 7 14014 1 93 64 17 8 13382 1 89 66 18 9 12758 1 85 Temperature to Resistance Voltage Chart Temp F Temp C Resistance Ohms...

Страница 33: ...40147 4 095 25 3 9 35165 3 982 30 1 1 30805 3 862 35 1 6 27140 3 737 40 4 4 23874 3 605 45 7 2 21094 3 470 50 10 0 18655 3 330 52 11 1 17799 3 275 54 12 2 16956 3 217 56 13 3 16164 3 160 58 14 4 15385 3 100 60 15 6 14681 3 042 62 16 7 14014 2 985 64 17 8 13382 2 927 66 18 9 12758 2 867 68 20 0 12191 2 810 69 20 6 11906 2 780 70 21 1 11652 2 752 71 21 7 11379 2 722 72 22 2 11136 2 695 73 22 7 10878...

Страница 34: ...ese instructions prior to testing the unit or else the modulating valve will not control properly and may damage your equipment Figure 17 Supply Air Temperature Sensor Installation Stand Alone Mode In Stand Alone Mode the SATSensor is connected to the MODGAS XWR2 Controller If in Stand Alone Mode the MODGAS XWR2 Controller is used in conjunction with a Stand Alone MHGRV Controller the SAT sensor i...

Страница 35: ...X or VCCX2 Connect to VCB X or VCCX2 using E BUS cable Install Supply Air Sensor in VCB X or VCCX2 Connect to VCB X or VCCX2 using E BUS cable VCM X SA RNE Install Supply Air Sensor in Main Controller Connect to Main Controller using I2 C cable Install Supply Air Sensor in Main Controller Connect to Main Controller using I2 C cable VCM VAV CAV MUA MUA II MUA IID Install Supply Air Sensor in MODGAS...

Страница 36: ...mperature Sensor needs to remain installed on whatever controller it is currently on Figure 18 MODGAS XWR2 Controller Step 4 Unplug the TB2 Input Terminal Block from the MODGAS XWR and replug it into the MODGAS XWR2 board Step 5 Unplug the Ignition blocks and Valve headers from the MODGAS XWR and replug them into the MODGAS XWR2 board Step 6 Wire the MODGAS XWR2 relays according to the valve confi...

Страница 37: ...MODGAS XWR2 Technical Guide NOTES 37 ...

Страница 38: ...al Support 918 382 6450 techsupport aaon com AAON Controls Support 866 918 1100 Monday through Friday 7 00 AM to 5 00 PM central standard time NOTE Before calling Technical Support please have the model and serial number of the unit available PARTS For replacement parts please contact your local AAON Representative MODGAS XWR2 Controller Technical Guide V22330 Rev 01C 200131 ...

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