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VersaPro
Packaged Heat Pump
Service Manual
MODELS:
•
MPH241H413B
•
MPH301H413B
•
MPH361H413B
•
MPH421H413B
•
MPH481H413B
•
MPH601H413B
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: 05/16/24
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 MPH241H413B
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: 05/16/24 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
5.10 Condenser Fan Motor ....................39 5.11 Compressor ........................40 APPENDIX ............................41 6.1 Wiring Diagrams .......................41 6.2 Control Board Replacement Procedure ................45 6.3 Fault Codes of Motor Driver & Main Control Modules ..........46 6.4 Troubleshooting Guide ....................47 6.5 Temperature & Resistance Relationship Tables ............48 mrcool.com... -
Page 3: Refrigeration
Used to switch mode between cooling and heating Used for low pressure protection when below 20 PSIG Low pressure switch and recovery up to 44 PSIG Stores the liquid component of the refrigerant and Accumulator Accumulator reduces the load of the condenser mrcool.com... -
Page 4: Functional Parts
REFRIGERATION 1.2 Functional Parts 13.4H 71/90 13.4H 105 mrcool.com... - Page 5 REFRIGERATION 13.4H 120/140/160 Electric Control Box for Symbol Part Name 71/90/105/120/140/160 Motor Fan motor Outdoor fan High pressure switch Discharge temperature switch Comp. Compressor Coil Condenser Coil Reversing Valve Fusible Plug Assembly Pressure Switch Accum. Accumulator mrcool.com...
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Page 6: Refrigerant Flow Chart
REFRIGERATION 1.3 Refrigerant Flow Chart mrcool.com... -
Page 7: Function & Control
REFRIGERATION 2.1 General Function mrcool.com... -
Page 8: Unit Shutdown Control
10 speed ECM motor; controlled Outdoor Fan Motor by T3 The heat pump requires the "B" signal of 24V wires. • • COOLING: The reversing valve is OFF during cooling. • HEATING: -The reversing valve is ON during heating and heating standby. -The reversing valve will delay about 1 minute when first starting for reversing reliability. mrcool.com... -
Page 9: Fan Control
The PEV's function is to help equalize the refrigerant pressure on the high and low sides prior to operation of the compressor. A hissing sound will occur every time after the compressor stops; this is the PEV equalizing the pressure. mrcool.com... -
Page 10: Defrost Control
T4 < 32°F (3°C) and lasts for 65 minutes. • "Standby time" is 2 hours, T3 < 28°F (-2°C) when starting and lasts for 15 minutes. • 2.8 Unit Protection Control T3 Protection in Cooling T5 (Discharge Temperature) Protection mrcool.com... -
Page 11: Fault Of Main Board
Low pressure switch is not properly LED2 3 Flash/Cycle correctly connected Motor fault/severe weather (fan rpm LED2 5 Flash/Cycle DC fan motor fault too low due to wind) LED2 6 Flash/Cycle Phase sequence error Speed message isn't in main board mrcool.com... -
Page 12: Unit Fault Control Or Restart
FUNCTION & CONTROL 2.10 Unit Fault Control or Restart: T3 Sensor Not Reading Correctly in Cooling T4 Sensor Not Reading Correctly mrcool.com... - Page 13 FUNCTION & CONTROL LPC Open OFAN Failure mrcool.com...
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Page 14: Field Settings
70℉ Set system thermostat ON Note: Check operations Check for the 24V signal from thermostat Check for operation mode Check for the digital display shows the compressor frequency Check for normal operations mrcool.com... -
Page 15: Charging Refrigerant
5F Do as the following 3 steps: ① Recycle refrigerant; ② Welding leakage points; ③ Re-vacuum; ④ Refrigerant is charged by weigh-in charging method according to nameplate data 3.4 Manual Defrost mrcool.com... -
Page 16: Dip Switch Setting
FIELD SETTINGS 3.5 Dip Switch Settings mrcool.com... -
Page 17: Led Position Indication
Check whether the power supply Replace the power cord is short-circuited to ground Check If Refer to 5.10 (Page 39) / compressor or 5.11 (Page 40) motor is shorted Replace compressor or to ground motor mrcool.com... -
Page 18: Thermostat
Low pressure switch is not properly LED2 3 Flash/Cycle reading correctly connected Motor fault; severe weather (fan rpm too low LED2 5 Flash/Cycle DC fan motor fault due to wind) LED2 6 Flash/Cycle No machine type No speed message in main board mrcool.com... - Page 19 Main board is broken or motor type is wrong LED1 5 Flash/Cycle Motor startup failure Check the motor LED1 6 Flash/Cycle Phase sequence error Check the motor supply wiring These fault codes will be displayed until the issue is resolved. • mrcool.com...
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Page 20: Symptom-Based Troubleshooting
Check whether the power supply Replace the power cord is short-circuited to ground Check If Refer to 5.10 (Page 39) / compressor or 5.11 (Page 40) motor is shorted Replace compressor or to ground motor Replace the control board mrcool.com... - Page 21 Heating:5~86℉ If there are No need to have service above conditions Refer to 5.6 (Page 35) If T4 sensor Replace the T4 sensor failed Refer to 5.7 (Page 36) If T4 sensor Replace the T4 sensor failed Run Normally mrcool.com...
- Page 22 ②If there is blocking on condenser installation manual. If there are above Correct it conditions ①Refer to 5.4 (Page 33) ②Refer to 3.3 Charging Check for the following 2 points: Refrigerant (Page 14) ①Replace orifice ①Abnormal throttle. ②Add refrigerant ②Under charged mrcool.com...
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Page 23: Main Board Fault Code Troubleshooting
T3 sensor not reading correctly in cooling Classification System Fault Wrong location of T3 sensor • Faulty T3 sensor • Possible Cause The wiring terminal is loose or poor • The sensor surface is covered with foreign matter • mrcool.com... - Page 24 If the T4 location Correct the location before. Refer to 1.2 is wrong Functional Parts If the wiring is Correct the wiring loose or poor T4 failed Replace T4 sensor Refer to 【 5.6 】 *Temperature-OHM chart Unit Run Normally mrcool.com...
- Page 25 5.8 (Page 37) If under Refer to Correct it 3.3 Charging charged Refrigerant (Page 14) If there is poor heat Correct it Refer to exchange 5.1/5.2/5.3 (Pages 30-32) If there is Correct it blocking Refer to 5.4 (Page 33) Run Normally mrcool.com...
- Page 26 Model Possible cause Start electromagnetic interference Fault Name DC fan motor fault Motor failed Electric issue Classification Electric issue Start electromagnetic interference • Possible Motor failed • Cause Electric issue • Refer to 5.10 (Page 39) mrcool.com...
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Page 27: Motor Driver Module Troubleshooting
LED1 - 0.2s On / 0.2s Off Issue LED1 - 0.2s On / 0.2s Off Model Fault Name Integrated circuit communication error fault Classification Electric issue Motor driver module poor contact • Possible Cause Control board broken • LED1- 0.2S ON 0.2S OFF Need to replace control board mrcool.com... - Page 28 Inverter module temperature error Classification Electric issue Possible Motor is broken • Cause Control board is broken • Inverter module temperature error If Motor is Replace the motor broken Refer to 【 5.11 】 Need to replace control board mrcool.com...
- Page 29 Voltage : 187V-253V If power Correct it supply is wrong Replace control board LED1-4 Flash/Cycle Issue LED1-4 Flash/Cycle Model Fault Name Motor Parameter Error Classification Electric issue Possible Control board broken • Cause Motor parameter error Replace control board mrcool.com...
- Page 30 Control board broken LED1-6 Flash/Cycle Issue LED1-6 Flash/Cycle Model Fault Name Phase sequence error Classification Electric issue Motor wiring broken • Possible Cause Control board broken • Phase sequence error If motor wiring is Correct it broken Replace control board mrcool.com...
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Page 31: System Checks
Blocking of indoor filter is not blocked indoor units filter ←Does indoor motor stop Indoor motor failure working? Refrigerant cycle is blocked ←Refer to the refrigerant cycle check Excessive refrigerant charging ←Refer to the refrigerant charging check mrcool.com... -
Page 32: Low Pressure Drop-Cooling
SYSTEM CHECKS 5.2 Low Pressure Drop-Cooling Note: 110-140 PSIG head pressure is normal in cooling conditions. The value may be lower/higher at maximum/ minimum/limited frequency of compressor operation, start-up, or return oil stages mrcool.com... -
Page 33: Low Pressure Drop-Heating
SYSTEM CHECKS 5.3 Low Pressure Drop-Heating mrcool.com... -
Page 34: Blocked Refrigeration Cycling
SYSTEM CHECKS 5.4 Blocked Refrigeration Cycling Note: Check both in normal and forced modes as some problems will become more obvious. mrcool.com... -
Page 35: Control Board
SYSTEM CHECKS 6 Check 6.5 Check for control board CHECK 5 5.5 Control Board mrcool.com... -
Page 36: Temperature Sensor (T3/T4)
Does the resistance in thermistor meet the Replace sensor chart above? Are the inspection parameters consistent with the Replace the control parameters in the left table? board Refer to Note：low probability, 6.5 (Page 48) caution in handling Work normal mrcool.com... -
Page 37: 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 pressure Should replace board protection? Note: low probability, caution in handling Work well mrcool.com... -
Page 38: Low Pressure Switch (Lps)
When power off and pull up Reconnect/fix Low pressure the wiring switch secure, no wiring damages? damages abnormal pressure R < 1Ω switch, replace it Still in low Should replace board pressure protection? Note: low probability, caution in handling Work well mrcool.com... -
Page 39: 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 40: Condenser Fan Motor
>10M and ground normal? If the current is pulsating violently or abnormally If the motor Motor replace beyond the “B” value current is normal Motor output（ （ W） ） B(A) Check according to the condition of whole unit mrcool.com... -
Page 41: Compressor
>10M and ground If the current is pulsating If the violently or abnormally Compressor replace compressor beyond the “B” value current is normal Check according to the condition of whole unit Model 2Ton 2.5Ton 3Ton 3.5Ton 4Ton 5Ton B(A) mrcool.com... -
Page 42: Appendix
7 Appendix APPENDIX Appendix 1 7.1 Wiring diagrams for 24K 6.1 Wiring Diagrams 24K: mrcool.com... - Page 43 APPENDIX 7 Appendix Appendix 1 7.1 Wiring diagrams for 30K 30K: mrcool.com...
- Page 44 APPENDIX 7 Appendix Appendix 1 7.1 Wiring diagrams for 36/60K 36K/60K: mrcool.com...
- Page 45 7 Appendix APPENDIX Appendix 1 7.1 Wiring diagrams for 42/48K 42K/48K: mrcool.com...
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Page 46: Control Board Replacement Procedure
). 6.Set up the SW1、SW2 and SW3 switches refer to the wire diagram. 7.Reconnect the wires according to the wire diagram. 8.Double check the wire connection, screws, thermal paste etc. mrcool.com... -
Page 47: Fault Codes Of Motor Driver & Main Control Modules
Fault Code of Motor Driver Module Steady On Normal Operation Power Supply Failure 1 Flash/Cycle Motor Current Error 2 Flash/Cycle Inverter Module Temperature Error 3 Flash/Cycle DC Bus Voltage Error 5 Flash/Cycle Motor Startup Failure 6 Flash/Cycle Phase Sequence Error mrcool.com... -
Page 48: Troubleshooting Guide
Not Start but O.D. Fan Runs O.D. Fan Won't Start Compressor Hums But Won't Start I.D. Blower Won't Start Defrost Unit Won't Initiate Defrost Defrost Terminates on Time Unit Icing Up C- Cooling H- Heating P- Primary Causes S- Secondary Causes mrcool.com... -
Page 49: Temperature & Resistance Relationship Tables
41.38 12.97 4.72 1.95 40.15 12.64 4.61 1.91 38.97 12.31 4.51 1.88 37.82 11.99 4.41 1.84 36.71 11.68 4.31 35.64 11.38 4.21 1.77 34.6 11.09 4.12 1.73 33.59 10.8 4.03 32.61 10.53 3.94 1.66 31.67 3.85 1.63 30.76 3.77 mrcool.com... - Page 50 VersaPro Packaged Heat Pump 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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