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Invest MSC-24/QD FP, Service Manual

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Invest MSC-24/QD FP Service Manual Download Page 34

 

 

32

YES  

Does compressor 
operate? 

Is the connection 
good? 

Is refrigerant 
circulation 
volume normal? 

NO  

NO  

Charge refrigerant 

Is abnormality 
the same after 
gas charging? 

NO  

Check refrigerant system (such 
as clogging of capillary, etc)

Reconnect and retest. 

NO  

YES  

Is protector 
normal? 

Replace the protector. 

NO  

YES  

Check the outdoor 
main PCB. Is there 
some problem? 

Replace the outdoor PCB. 

YES  

 

 

 

9.2.8    P4(inverter compressor drive error) diagnosis and solution. 

Is the connection of 
compressor good? Is the 
wiring sequence right? The 
voltage range proper? 

Replace the outdoor E-box. 

If the problem comes to 
again, check coil resistance 
of inverter compressor, is it 
0.452ohm?

YES 

Replace inverter compressor 

Reconnect and retry 

NO 

NO 

 

 

 

Summary of Contents for MSC-24/QD FP

Page 1: ...SERVICE MANUAL INVEST HEAT PUMP DC INVERTER SPLIT WALL MOUNTED TYPE MSC 24 QD FP MSH 24 QD FP V1 0 Nov 2009...

Page 2: ...function 19 8 3 Protection Fel Bokm rket r inte definierat 8 4 Fan Only Mode Fel Bokm rket r inte definierat 8 5 Cooling Mode Fel Bokm rket r inte definierat 8 6 Drying mode Fel Bokm rket r inte defin...

Page 3: ...aler or an Authorized service center There is risk of fire electric shock explosion or injury Do not install the product on a defective installation stand It may cause injury accident or damage to the...

Page 4: ...y A bad connection may cause water leakage Keep level even when installing the product To avoid vibration of water leakage Do not install the product where the noise or hot air from the outdoor unit c...

Page 5: ...ll batteries in the remote control with new ones of the same type Do not mix old and mew batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble the...

Page 6: ...ver direction according to operation mode Turbo wind high med low breeze Restarting is for approx 3 minutes Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in c...

Page 7: ...ency at operation mode Hydrophilic aluminum fin It is only operated in the heating operation mode except defrosting operation Anti rust cabinet Valve protection cover 4 way valve control Made from ele...

Page 8: ...6 3 Dimension 3 1 Indoor Unit MSC 24 QD FP MSH 24 QD FP...

Page 9: ...7 3 2 Outdoor Unit MSC 24 QD FP...

Page 10: ...ing Input W 72 70 54 50 72 70 54 50 Capacitor u 3 3 Indoor fan motor Speed hi mi lo r 1260 1210 1020 950 1260 1210 1020 950 Indoor air flow Hi Mi Lo m 1150 1080 960 1150 1080 960 Indoor noise level Hi...

Page 11: ...9 5 Refrigerant cycle diagram...

Page 12: ...10 6 Wiring diagram 6 1 Indoor Unit MSC 24 QD FP MSH 24 QD FP...

Page 13: ...11 6 2 Outdoor Unit MSC 24 QD FP...

Page 14: ...5 8 16 0 3 8 9 52 5 10 25 40 Caution Capacity is based on standard length and maximum allowance length is base of reliability Oil trap should be installed per 5 7 meters 7 4 Air purging of the piping...

Page 15: ...onds and then wait for one minute 5 Use torque wrench to tighten the service port cap to a torque of 1 8 kgf m 18N m 6 Set the 3 way valve to the opened position 7 Mounted the valve stem nuts to the 2...

Page 16: ...hose with the push pin to the gas service port 5 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 6 Set the 2 way valve to the cl...

Page 17: ...te repeat 3 times After purging the air use a torque wrench to tighten the flare nut to on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigera...

Page 18: ...ice port 3 Open the valves Low side on the charge set and discharge the refrigerant until the gauge indicates 0 05 to 0 1Mpa If there is no air in the refrigeration cycle the pressure when the air con...

Page 19: ...ved toward 0 1 Mpa 76 cmHg vacuum of 4 mmHg or less 3 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after...

Page 20: ...fied amount of refrigerant if can be charged with a little at a time approximately 150g each time0 while operating the air conditioner in the cooling cycle however one time is not sufficient wait appr...

Page 21: ...indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode TEMPERATURE indicator Usually it displays the temperatu...

Page 22: ...t current voltage and temperature If these protections happened the unit will stop and LED display error code 8 3 6 Indoor fan delayed open function When the unit is turned on at all modes the indoor...

Page 23: ...nutes the frequency will change as follow Zone A Current frequency rise a grade till the maximum grade F8 Zone B Keep the current frequency of compressor Zone C Descend the current frequency of compre...

Page 24: ...od 8 6 2 m temperature is lower than 10 compressor will stop and not resume until room 8 6 3 emperature protection and outdoor unit frequency limit are valid 6 4 Horizontal louver action is the same a...

Page 25: ...ut anti cold wind function is preferential Auto fan action in heating mode T oom temp setting Temp medium 2 5 2 0 1 5 1 0 low high cy is as follow y one grade and not stop until the maximum grade Zone...

Page 26: ...the machine will defrost no matter if T2 drops for more than 5 or not If any one of following items is satisfied defrosting will finish and the machine will turn to normal heating mode econds c The ma...

Page 27: ...6 times or more within 10 seconds make sure indoor unit receives these signals the machine will turn into rating capacity test mode the buzzer will make a di sound for 2 seconds continuously Also ind...

Page 28: ...the touch button twice within 5s the unit will enter forced cooling mode When the unit is or forced cooling mode pressing the touch button continuously 8 9 3 In forced operation mode all general prote...

Page 29: ...in timer off mode if the timing time is less than 7 hours sleep function will be cancelled when reaching the setting time If the timing time is more than 7 hours the machine will not stop until reache...

Page 30: ...pacitors in PCB and relative circuit in outdoor unit even shut down the power supply electricity power still are kept in capacitors do not forget to discharge the electricity power in capacitor Electr...

Page 31: ...E5 Open or short circuit of outdoor temperature sensor E6 Open or short circuit of room or evaporator temperature sensor P0 Inverter module over strong current protection P1 Over voltage or too low v...

Page 32: ...NO NO Reconnect and retest again Is the LED4 red on outdoor PCB bright and LED1 yellow blinking Replace outdoor e box Yes Yes The power supply for outdoor PCB is fail Check the wiring on outdoor PCB...

Page 33: ...protection diagnosis and solution Is all connections on PCB and between PCB and compressor good Repair or correct the connector or connection Replace the outdoor PCB and then repower on Is the failur...

Page 34: ...s protector normal Replace the protector NO YES Check the outdoor main PCB Is there some problem Replace the outdoor PCB YES 9 2 8 P4 inverter compressor drive error diagnosis and solution Is the conn...

Page 35: ...value of each winding by using the multi meter Position Resistance Value Blue Red 0 95 Blue Black 20 Red Blue 9 3 2 Outdoor Fan Motor Model YDK53 6N Measure the resistance value of each winding by usi...

Page 36: ...haust temp Te sensor Measure the resistance value of each winding by using the multi meter Some frequently used R T data for T1 T2 T3 and T4 sensor Te mperature 0 5 0 5 0 0 0 0 Re sistance Value K 6 9...

Page 37: ...35...

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