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Related Manuals for AAON MODGAS-X
Summary of Contents for AAON MODGAS-X
- Page 1 MODGAS-X Module Technical Guide...
- Page 2 AAON Controls Support: 866-918-1100 This document is subject to change without notice. It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.
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Page 3: Table Of Contents
SAT Sensor Testing ............................... 31 APPENDIX A: SAT SENSOR ..................33 Installation ................................33 SAT Sensor Wiring Guide and Jumper Settings ....................34 APPENDIX B: MODGAS II REPLACEMENT ..............35 MODGAS-X Replacement of MODGAS II ......................35 APPENDIX C: MAXITROL VALVES................36 ® MAXITROL Stepper Valve Types ........................ - Page 4 Figure 8: ................14 Two Modulating Staged Valves Communicating Wiring Diagram Figure 9: ..............15 LCD Display and Navigation Keys Figure 10: ........................20 MODGAS-X LED Locations and Descriptions Figure 11: ....................29 Supply Air Temperature Sensor Installation Figure 12: ......................33 MODGAS-X Module Figure 13: ..............................35...
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Page 5: Overview
I that allow for status display, setpoint changes, and for wiring details. force modes The MODGAS-X can be configured at the factory for one of the The MODGAS-X contains no user-serviceable NOTE: following configurations: parts. Contact qualified technical personnel if •... -
Page 6: Dimensions
.47uF 6042 1.68 LABEL P/N: 1212 E-BUS VOUT G041210 2803 CONNECT CONNECT 1962 D210 U210 0.21 .01uF 2.04 0.25 Note: Depth is 1.50 inches. 0.57 4.09 Note: All dimensions are in inches. Figure 1: MODGAS-X Module Dimensions MODGAS-X Technical Guide... -
Page 7: Wiring
Important Wiring Considerations Wiring Please carefully read and apply the following information when wiring the AAON unit controller, MODGAS-X and any The modules must be connected to an 18-30 VAC power source associated module. of the proper size for the calculated VA load requirements. All 1. -
Page 8: Single Modulating Valve No Staging - Stand-Alone Wiring
WIRING Single Modulating Valve No Staging - Stand-Alone Wiring Single Modulating Valve No Staging - If using a MHGRV-X Module along with the MODGAS-X module in Stand-Alone Mode, the SAT Sensor always connects Stand-Alone Wiring to the MODGAS-X. This configuration can use either the MAXITROL 0-20 volt ®... -
Page 9: Single Modulating Valve No Staging - Communicating Wiring
E-BUS cable connecting to the appropriate E-BUS ports. For If additional fixed stages are required, these NOTE: all other controllers, including VAV/CAV, MUA, VCM, VCM-X, should be configured and wired to the AAON unit SA, and RNE Controllers, use an I C cable connecting to the controller’s relays. -
Page 10: Single Modulating Valve And Up To 14 Stages Of Fixed Heat Stand-Alone
MODGAS-X. Module, the 12 Relay E-BUS Expansion Module will turn off its relays and the MODGAS-X will alarm and fall back to using The first two fixed stages use AUX1 (RLY3) and AUX2 (RLY4) only its onboard stages. If communications is restored, the relays to enable them (Figure 4, this page). -
Page 11: Figure 5: Single Modulating Valve And 14 Stages Of Fixed Heat - 12 Relay E-Bus Expansion Module
Heat Stage 9 (Fixed) Heat Stage 10 (Fixed) Heat Stage 11 (Fixed) 15 VA minimum power required 18-30 E-BUS cable connects to MODGAS-X Figure 5: Single Modulating Valve and 14 Stages of Fixed Heat - 12 Relay E-BUS Expansion Module MODGAS-X Technical Guide... -
Page 12: Two Modulating Valves And Up To 13 Stages Of Fixed Heat Stand-Alone
If communication is lost to the 12 Relay E-BUS Expansion the AUX1 Relay (RLY3). The fixed stage uses the AUX2 (RLY4) Module, it will turn off its relays and the MODGAS-X will alarm relay to enable it (Figure 6, this page). Additional fixed stages and fall back to using only its onboard stages. -
Page 13: Figure 7: Two Modulating Valves And 13 Stages Of Fixed Heat - 12 Relay E-Bus Expansion Module
Heat Stage 9 (Fixed) Heat Stage 10 (Fixed) Heat Stage 11 (Fixed) 15 VA minimum power required 18-30 E-BUS cable connects to MODGAS-X Figure 7: Two Modulating Valves and 13 Stages of Fixed Heat - 12 Relay E-BUS Expansion Module MODGAS-X Technical Guide... -
Page 14: Two Modulating Staged Valves - Stand-Alone Wiring
FAN Relay (RLY1). The second Modulating Valve is enabled by for depiction. the AUX1 Relay (RLY3). Do not connect power to VOUT/Ground WARNING: If using a MHGRV-X Module along with the MODGAS-X in terminal block. Stand-Alone Mode, the SAT Sensor always connects to the MODGAS-X. 0-10 VDC... -
Page 15: Two Modulating Staged Valves - Communicating Wiring
E-BUS cable connects to I C cable connects to I C Port minimum VCCX2 or VCB-X Controller’s on any non VCCX2 or VCB-X Controller expansion port or expansion module Figure 9: Two Modulating Staged Valves Communicating Wiring MODGAS-X Technical Guide... -
Page 16: Inputs And Outputs
Heat Enable Contact (HEAT EN) This stage and any additional stages of heat will stage up and This input is only required when the MODGAS-X is used in down as required to maintain the Supply Air Temperature Stand-Alone Mode. The Heat Enable Input is activated by a 24 Setpoint. - Page 17 Supply Air Temperature Setpoint. This stage and any additional stages of heat will stage up and down as required to maintain the Supply Air Temperature Setpoint. The Stage Up Delay default is three minutes. The Stage Down Delay default is one minute. MODGAS-X Technical Guide...
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Page 18: Sequence Of Operation
Operating Modes Normal Operation Stand-Alone Mode The MODGAS-X modulates up to two gas valves (for 0-20 volt valves) or eight gas valves (for 0-10 volt valves) to maintain a When used in Stand-Alone Mode, the MODGAS-X will desired Discharge Air Temperature. It also controls the speed... -
Page 19: Table 3: Heating Mode Voltage/Signal
Deadband. Min Mode will run for a user defined interval set on the MinPosTP screen on page 27. If the MODGAS-X is controlling more than one Stage of Heat, it will use the following staging sequence: 3. After the runtime, it will continue into Heating Mode. -
Page 20: Lcd Screens
The MENU key cancels editing when in Edit Mode. The screen you were editing will return to its original value and the underscore will disappear. A second press of the MENU key will return you to the Main Menu. Table 5: Editing Key Functions MODGAS-X Technical Guide... -
Page 21: Main Screens Map
Main Screens. The first screen is an initialization screen. To scroll through the rest of the screens, press the button. <MENU> MODGAS-X 1044 V.XXX Press to scroll through the MODGAS-X Screens. Press to go to the STATUS Screens. STATUS Press to scroll through the STATUS Screens. Press to go to the ALARMS Screens. -
Page 22: Modgas-X Screens
LCD SCREENS MODGAS-X Screens MODGAS-X Screens # STAGES T=2 M=2 From the MODGAS-X Screen, press to scroll through <ENTER> the screens. NUMBER OF STAGES CONFIGURED MODGAS-X T = Total stages fixed and modulating. M = Total modulating stages. 1044 V.XXX... -
Page 23: Status And Alarms Screens
Mode. In Communications Mode, the AAON unit controller sends the setpoint. HEAT MODE This screen displays the current operating mode of the MODGAS-X. FAN SPD The mode options are: OFF: This mode will display when there is no call for heat and heating has been disabled. -
Page 24: Setpoint And Force Screens
NOTE: When you turn the Force Mode back off or after one hour has elapsed, the valve will reinitialize to zero. The SAT Setpoint is set by the LCD Display in Stand-Alone Mode and is set by the AAON unit controller in Communications Mode. Minimum Default Maximum The next 15 screens are for relays only. -
Page 25: Protected And Diagnostic Screens
LCD SCREENS Protected and Diagnostic Screens Protected Screens Map Diagnostic Screens From the MODGAS-X Screen, press twice until you Refer to the following map when navigating through the <ENTER> get to the SOFTWARE Screen. Then hold the button for Diagnostic Screens. From the DIAGNSTC Screen, press <UP>... -
Page 26: Configuration Screens
ModRate # MOD STG XXXs MOD RATE NUMBER OF MODULATING STAGES Range: 1-120 seconds 0-20 Volt - Range is 1 or 2. Default is 1. 0-10 Volt - Range is 1 to 8. Default is 1. MODGAS-X Technical Guide... - Page 27 St@MinDb XXº MIN MODE DEADBAND Range: 0-30 degrees. NOTE: If it is set to 0, Min Mode will not initialize and the sequence will continue to Heating Mode. MinPosTP XXXs MIN MODE RUN TIME Range: 0-500 seconds. MODGAS-X Technical Guide...
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Page 28: Troubleshooting
Communication LED - This yellow LED will light up and blink when COMM The MODGAS-X is equipped with LEDs that can be used to communications are detected. verify operation and perform troubleshooting. There are LEDs for communication, operation modes, and diagnostic codes. The Relay LEDs module has 10 LEDs—eight used for operation and status, and... -
Page 29: Figure 11: Modgas-X Led Locations And Descriptions
HEAT EN (BI) AUX 1 RESET IN (AI) AUX 2 COMM LED SAT IN (AI) COMM POWER LED GND (AI) GAS VALVE AUX. (AI) TERMINALS VOUT LABEL P/N: E-BUS G041210 CONNECT CONNECT Figure 11: MODGAS-X LED Locations and Descriptions MODGAS-X Technical Guide... -
Page 30: Alarms
NOTE: • With Supply Air Sensor disconnected from the MODGAS-X, set volt meter to DC volts and measure • Check relay outputs on the MODGAS-X for 24 VAC voltage between SAT and GND on board. Refer to output. Tables 8 and 9, pages 31 and 32 for readings. -
Page 31: Sat Sensor Testing
Note: 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. Table 8: 0-3V Temperature Sensor - Voltage and Resistance for Type III Sensors MODGAS-X Technical Guide... -
Page 32: Table 9: 0-5V Temperature Sensor - Voltage And Resistance For Type Iii Sensors
Note: If the voltage is above 5.08 VDC the sensor or wiring is “open.” If the voltage is less than 0.05 VDC, the sensor or wiring is shorted. Table 9: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors MODGAS-X Technical Guide... -
Page 33: Appendix A: Sat Sensor
Stand-Alone Mode Sensor In Stand-Alone Mode, the SAT Sensor is connected to the MODGAS-X. If, in Stand-Alone Mode, the MODGAS-X is used The Supply Air Temperature (SAT) Sensor should be located in conjunction with a Stand-Alone MHGRV-X module, the SAT in the duct-work downstream of the unit supply air connection. -
Page 34: Sat Sensor Wiring Guide And Jumper Settings
Table 9, page 32 for jumper setting 2. ** For SAT Sensor testing, use Table 9, page 32 for Jumper ** In this situation, also set MHGRV-X SAT Option to MODGAS-X. Setting 1. SAT Sensor should be connected to the MODGAS-X. -
Page 35: Appendix B: Modgas Ii Replacement
Step 2: Set the SAT Options Jumper per Table 12, page 34. Step 3: the MODGAS II and wire it to the MODGAS-X. If the Connect power to the MODGAS-X. Step 4: Supply Air Temperature Sensor is being shared with a Stand-Alone MHGRV Module, maintain the same wiring with the MHGRV Module. -
Page 36: Appendix C: Maxitrol ® Valves
APPENDIX C: MAXITROL VALVES ® MAXITROL Stepper Valve Types ® Figure 14: Two-Wire 0-20 Volt Reverse-Acting MAXITROL Selectra Stepper Valve ® Figure 15: Four-Wire 0-10 Volt Directing-Acting MAXITROL EXA STAR Stepper Valve ® MODGAS-X Technical Guide... - Page 37 NOTES MODGAS-X Technical Guide...
- Page 38 Monday through Friday, 7:00 AM to 5:00 PM Central Standard Time Controls Support website: www.aaon.com/controlstechsupport AAON Factory Technical Support: 918-382-6450 techsupport@aaon.com 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.