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VersaPro
Gas Package Unit
Service Manual
MODELS:
• MPG24S060M413B
• MPG30S060M413B
• MPG36S090M413B
• MPG42S090M413B
• MPG48S090M413B
• MPG60S110M413B
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: 05/10/24
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
Related Manuals for MrCool VersaPro MPG24S060M413B
Summary of Contents for MrCool VersaPro MPG24S060M413B
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: 05/10/24 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
5.4 High Pressure Switch (HPS) ................23 5.5 Low Pressure Switch (LPS) ................24 5.6 Discharge Temperature Switch (T5) ..............25 5.7 Compressor ......................26 APPENDIX ........................27 6.1 Wiring Diagrams ....................27 6.2 Indoor Fan Replacement Procedure ..............34 mrcool.com... -
Page 3: System Overview
High pressure switch PSIG and recovery when below 464 PSIG Fan of outdoor Used to help heat exchange by PSC motor Used for low pressure protection when below Low Pressure Switch 29 PSIG and recovery when up to 44 PSIG. mrcool.com... -
Page 4: Functional Parts
Fan motor Outdoor fan High pressure switch Low pressure switch Discharge temperature switch Comp. Compressor Cond. Condenser Coil Evap. Evaporator Coil Indoor Fan Symbol Part Name Motor Exhaust fan motor Pressure switch Burner Burner assembly Heat exchange pipe Control board mrcool.com... -
Page 5: Refrigerant Flow Chart
REFRIGERATION 1.3 Refrigerant Flow Chart mrcool.com... -
Page 6: Function & Control
Cooling: R, C, G, Y signals are on. When "W" signal is lost, the gas valve will shut • Heating: R, C, W signals are on. down immediately, while the smoke extraction fan and inside fan will continue to work for the time delay. mrcool.com... -
Page 7: Unit Protection Control
FUNCTION & CONTROL 2.5 Unit Protection Control Discharge Temperature Protection in Cooling High Pressure Switch in Cooling High Pressure Switch in Cooling System Lockout in Heating mrcool.com... - Page 8 FUNCTION & CONTROL Pressure Switch Problem Detected High Limit Switch Protection Device Open in Heating Flame Sensed and Gas Valve Not Flame Rollout Switch is Open Energized or No "W" Signal mrcool.com...
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Page 9: Unit Fault Control Or Restart
FUNCTION & CONTROL 2.6 Unit Fault Control or Restart: Discharge Temp. Sensor Not Reading HPS Open Correctly in Cooling LPS Open Pressure Switch in Heating High Limit Switch Open Flame Rollout Switch is Open mrcool.com... -
Page 10: Field Settings
Is the earth leakage circuit breaker connected normally? Dangerous if electrical leakage occurs Are the 24V signal wirings connected according to the wiring Abnormal operation diagram? (Including the thermostat wiring and setting) Does the supply voltage conform to the specifications on the Abnormal operation; damage of unit name plate? Are all sizes of cables as specified according to local regulations? Damage of cables 3.2 Turning Power On mrcool.com... -
Page 11: Thermostat
Gas Board Failure Steady Flash W Faults 2 Flash 1 Hour Lockout 3 Flash Pressure Switch 4 Flash LIM Open 5 Flash Flame W/O Gas 6 Flash Rollout 6 Flash W1/W2 Swapped These fault codes will be displayed until the issue is resolved. • mrcool.com... -
Page 12: Symptom-Based Troubleshooting
③Refer to wiring diagram to ensure all wire connections are correct. Check whether the power supply Replace the power cord is short-circuited to ground Check if one part is shorted to ground Replace Replace the control board mrcool.com... - Page 13 ③Replace the thermostat ④Connect the compressor wire Power off and wait at least 3 minutes then power on Cooling: 65~115°F (18~46°C) If there are No need to have serviced above conditions Replace the sensor If sensor failed Run Normally mrcool.com...
- Page 14 ①If there is limitation near unit the requirements ②If there is condenser blockage referred to in the installation manual. If there are above Correct it conditions Check for the following 2 points: ①Replace orifice ①Abnormal throttle ②Add refrigerant ②Under charged mrcool.com...
- Page 15 If the high pressure switch Correct or replace the HPS failed If there are Adjust refrigerant above conditions If there is poor heat exchange Correct it on condensing side If there is Correct it blockage Run normally mrcool.com...
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Page 16: Low Pressure Protection
If the high pressure switch Correct or replace the HPS failed If there are Adjust refrigerant above conditions If there is poor heat exchange Correct it on condensing side If there is Correct it blockage Run normally mrcool.com... -
Page 17: System Checks
①Connection pipe bend or blocked If there are ①Correct the pipe above conditions connection Replace the pressure Low pressure switch open transducer If undercharged Correct it If there is poor Correct it heat exchange If there is Correct it blockage Run Normally mrcool.com... -
Page 18: Main Board Fault Code Troubleshooting
System Lock-Out due to Failed Ignition Classification System Fault System Lock-Out due to too Many Flame Dropouts System lockout due to failed ignition • System Lock-Out due to failed to detect or sustain flame Possible System lockout due to excessive flame dropouts • Cause System lockout due to failure to detect or sustain flame • Notes mrcool.com... - Page 19 Pressure switch is not good Classification System Fault blockage in the pressure hose blockage in the exhaust pipe Faulty pressure switch • Possible Blockage in the pressure hose • Cause Blockage in the exhaust pipe • Notes mrcool.com...
- Page 20 4 Flash or 6 Flash Flame rollout switch open （heating） Mode Classify System fault High limit switch protection device open (heating) Name low airflow Flame rollout switch open (heating) blockage in the exhaust pipe Classification System Fault Low airflow • Possible Cause Blockage in the exhaust pipe • Notes mrcool.com...
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Page 21: System Checks
Blocking of outdoor ←Check to be sure the exchanger failure airflow cycle condenser roof space ≥60 inch failure in result in outdoor units high Outdoor motor ←Does outdoor motor stop pressure failure working? Refrigerant cycle is blocked Excessive refrigerant charging mrcool.com... -
Page 22: Low Pressure Drop-Cooling
←Make sure motor failure Motor stops or side or provide abnormal provide excessive airflow low airflow ← Conduct visual checks Blocking of duct for duct distribution distribution system system Refrigerant cycle is blocked Extremely lack of refrigerant mrcool.com... -
Page 23: Blocked Refrigeration Cycling
Cooling blocked mode The evaporator ← Obvious different appearance coil is blocked . on indoor coil, for example, frozen. ←Is the liquid pressure lower The condenser coil condenser when running than standby? is blocked . coil mrcool.com... -
Page 24: High Pressure Switch (Hps)
Note: Normal high pressure switch abnormal pressure opens above 600PSIG, resets R < 1Ω switch, replace it below 435PSIG. Still in high Should replace board pressure protection? Note: low probability, caution in handling Work well mrcool.com... -
Page 25: Low Pressure Switch (Lps)
When power off and pull up Reconnect/fix Low pressure switch the wiring secure, no wiring damages? damages abnormal pressure R < 1Ω switch, replace it Still in low pressure Should replace board protection? Note: low probability, caution in handling Work well mrcool.com... -
Page 26: Discharge Temperature Switch (T5)
Note: Normal discharge temperature switch abnormal pressure opens above 239℉, resets below 167℉. R < 1Ω switch, replace it Still in high Should replace board pressure protection? Note: low probability, caution in handling Work well mrcool.com... -
Page 27: Compressor
If the ground Between R and S <4 <1 Compressor replace resistance is (L2 and S) normal? Between U/V/W >10M >10M and ground If the compressor Compressor replace current is normal Check according to the condition of whole unit mrcool.com... -
Page 28: Appendix
APPENDIX 7 Appendix 6.1 Wiring Diagrams Appendix 1 7.1 Wiring diagrams for 24K Wiring Diagram-24K mrcool.com... - Page 29 APPENDIX Wiring Diagram-30K mrcool.com...
- Page 30 APPENDIX 7 Appendix Wiring Diagram-36K Appendix 1 7.1 Wiring diagrams for 36K mrcool.com...
- Page 31 APPENDIX Wiring Diagram-42K mrcool.com...
- Page 32 APPENDIX 7 Appendix Wiring Diagram-48K Appendix 1 7.1 Wiring diagrams for 48K mrcool.com...
- Page 33 APPENDIX Wiring Diagram-60K (S090) mrcool.com...
- Page 34 APPENDIX 7 Appendix Wiring Diagram-60K (S110) Appendix 1 7.1 Wiring diagrams for 60K（S110） mrcool.com...
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Page 35: Indoor Fan Replacement Procedure
8. Plug in the power and signal wires. Step 6: New motor horizontally pushed in Step 7: Use a screwdriver to fix the 2 bolts Step 8: Plug back the power and signal cables Bolts mrcool.com... - Page 36 VersaPro Gas Package Unit 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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