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VersaPro
96% Gas Furnace
Service Manual
MODELS:
• MGM96EE060B3NB
• MGM96EE080B3NB
• MGM96EE080C4NB
• MGM96EE100C5NB
• MGM96EE120D5NB
Read this manual carefully before installation and keep it where
the operator can easily find it for future reference.
Due to updates and constantly improving performance, the
information and instructions within this manual are subject to
change without notice.
Version Date: 05/30/24
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
TM
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Table of Contents
Troubleshooting
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Summary of Contents for MrCool VersaPro MGM96EE060B3NB
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: 05/30/24 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.
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Page 2: Table Of Contents
3.6 Pr Incorrect Polarity of L1/L2 ..............16 3.7 FL Low Flame ................... 16 APPENDIX ......................17 4.1 Two-Stage Controller Logic ..............17 4.2 Ignition Failure & Re-Ignition Sequence ..........19 4.3 Requirements for Refrigerant Leakage Sensors ........ 20 mrcool.com... -
Page 3: Safety Precautions
12. See instructions for lighting/shutdown operation (as shown on a sticker directly on the inside of the furnace panel). Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shutting off the electrical supply. mrcool.com... -
Page 4: Troubleshooting
4. Discharge your body to ground before removing a new control from its container. Follow steps 1 through 3 if installing the control on a furnace. Return any old or new controls to their containers before touching any ungrounded object. mrcool.com... -
Page 5: Resetting From Lockout
2. Manual power interruption. Interrupt 115 volt power to the furnace for 1 - 20 seconds. 3. Manual thermostat cycle. Lower the thermostat so that there is no longer a call for heat for 1 - 20 sec. 3.1 No Light & No Fan Leave "Park" terminal unused. mrcool.com... - Page 6 2. Press in the door switch. 1. Check for 18-31Vac power between “R” & “C” terminals with multi-meter. Figure 4 3. Use a multi-meter to measure the resistance. If it is 0 , then the door switch is ok. Figure 2 mrcool.com...
- Page 7 BK WH RD W V U 5 3 1 The resistance between motor U, V and W wires is 2~10 ohms 1. Check for 18-31Vac power between “G” & “C” terminals with multi-meter Figure 8 Figure 6 Data subject to change mrcool.com...
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Page 8: Troubleshooting Guide
Remove to ensure it pressure meeting the meets gas requirement? See blockage pressure Table 2 requirement Replace the gas Adjust the valve if the inlet gas pressure cannot The flame sense signal should be 1-6 microamps. pressure be adjusted mrcool.com... -
Page 9: Manifold Gas Pressure
Propane Gas 10 in. W.C. Propane Gas Minimum: 11.0 in W.C. Maximum: 13.0 in. W.C. Table 2 Inlet Gas Supply Pressure . n i Table 1 Manifold Gas Pressure Table 2 Inlet Gas Supply Pressure Table 1 Manifold Gas Pressure mrcool.com... -
Page 10: E1 Low Fire Pressure Switch Stuck Closed
Replace the PCB Board This error could also be caused by a blocked vent. Check vent for obstructions. If a vent is blocked, unit's safety protection logic will turn off unit. Figure 14 Figure 13 Data subject to change mrcool.com... -
Page 11: E2 Low Pressure Switch Stuck Open
See Figure 16. Is there Remove blockage in the blockage in the exhaust pipe? exhaust pipe Is the Replace pressure at the pressure switch correct? inducer See Figure 17. Replace pressure switch mrcool.com... - Page 12 1. Check for 0Vac between these two terminals with multi-meter. (1) Low Pressure Switch Set Point: 0.55 in. WC (2) High Pressure Switch Set Point: 1.1 in. WC Figure 16 Figure 18 mrcool.com Data subject to change...
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Page 13: E5 Limit/Rollout Switch Open <> 5 Minutes
See Tables 4 filter? &5 Correct the circulating fan motor speed or replace the motor if Check the Clean/Replace necessary. airflow duct the filter for blockage mrcool.com Data subject to change... - Page 14 150 / 120 Limit Switch - Fixed Model MGH96M060B3A MGH96M080B3A MGH96M080C4A MGH96M100C5A MGH96M100D5A MGH96M120D5A o l l t t e — F ° Inlet High Temperature Limit Off /On °F 150/120 150/120 150/120 150/120 150/120 150/120 mrcool.com switch - fi xed...
- Page 15 * A filter is required for each return air inlet. This table shows the airflow performance without a filter. To determine airflow performance with a filter, if a 3/4 inch (19mm) washable media filter is used, assume an additional 0.1 in. W.C. available external static pressure. ** The manufacturer default fan settings are based on model, refer to Table 24. mrcool.com...
- Page 16 * A filter is required for each return air inlet. This table shows the airflow performance without a filter. To determine airflow performance with a filter, if a 3/4 inch (19mm) washable media filter is used, assume an additional 0.1 in. W.C. available external static pressure. ** The manufacturer default fan settings are based on model, refer to Table 24. mrcool.com...
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Page 17: Pr Incorrect Polarity Of L1/L2
3.6 Pr (Incorrect Polarity of L1/L2) NOTE Please refer to the wiring diagram to confirm whether the connection is normal. Please check whether the input power ground wire is correctly and reliably connected to the machine. Figure 23 3.7 FL (Low Flame) mrcool.com... -
Page 18: Appendix
6. When there is no call for heat (no W1 call) and no flame is sensed, post-purge begins. This will last for 15 seconds. 7. There is a fan delay to dissipate heat in the system. This time depends on the dip switch S1-3 and S1-4. The default time is 180 seconds. mrcool.com... - Page 19 8. The blower motor will run at high speed for 30 seconds for fan delay. 9. There is a fan delay to dissipate heat in the system. This time depends on the dip switch S1-3 and S1-4. The default time is 180 seconds. mrcool.com...
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Page 20: Ignition Failure & Re-Ignition Sequence
5. The inducer will run at high speed for 60 seconds. 6. Test of low pressure switch 7. Preheating occurs for 27 seconds. 8. After preheating, the gas valve opens. The igniter will turn off after 3 seconds. After two failed ignition attempts, the system will lock out. mrcool.com... -
Page 21: Requirements For Refrigerant Leakage Sensors
4.3 Requirements for Refrigerant Leakage Sensors W2 Delay Heat Off Delay Cool Off Delay DIP SW Nominal DIP SW Nominal DIP SW Nominal (Minutes) (Minutes) (Minutes) S1-1 S1-2 S2-1 S2-2 S2-3 S2-4 *OFF OFF OFF OFF OFF OFF AUTO Option Switch Positions mrcool.com... - Page 22 If the refrigerant gas detection sensor is not installed or is incorrectly installed, it does not meet the requirements of current regulations and cannot effectively warn of an emergency, which may cause personal injury. Therefore, follow the instructions provided in the manual. mrcool.com...
- Page 23 2 minutes or the refrigerant fails sensor is faulty. Contact MRCOOL to check the sensor. The green light of the drive board LED2 flashes twice, disconnect the Y signal, stop the refrigeration, and the fan in Refrigerant...
- Page 24 VersaPro 96% Gas Furnace Service Manual The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.
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