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Panasonic CS-MRE7PKE, Service Manual

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Panasonic CS-MRE7PKE Service Manual Download Page 77

77 

17.4.23  F97 (Compressor Overheating) 

Malfunction Decision Conditions 

During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the 
compressor tank temperature sensor. 

 
Malfunction Caused 

š

  Faulty compressor tank temperature sensor 

š

  2/3 way valve closed 

š

 Refrigerant 

shortage 

(refrigerant leakage) 

š

  Faulty outdoor unit PCB 

š

 Faulty 

compressor 

 

Troubleshooting 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Summary of Contents for CS-MRE7PKE

Page 1: ...This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individu...

Page 2: ...n control Cool 44 15 2 Dew Prevention control Cool 44 15 3 Electronic Parts Temperature Rise Protection 1 Cool 44 15 4 Electronic Parts Temperature Rise Protection 2 Cool 44 15 5 Cooling overload cont...

Page 3: ...commended to be installed with Earth Leakage Circuit Breaker ELCB or Residual Current Device RCD Otherwise it may cause electrical shock and fire in case equipment breakdown or insulation breakdown 10...

Page 4: ...door unit air inlet and aluminium fin It may cause injury 5 Select an installation location which is easy for maintenance 6 Pb free solder has a higher melting point than standard solder typically the...

Page 5: ...se H L dB A 40 29 40 29 Power Level dB 56 56 Indoor Fan Type Cross flow Fan Cross flow Fan Material ASG20K1 ASG20K1 Motor Type DC 8 poles DC 8 poles Input Power W 47 3 47 3 Output Power W 40 40 Speed...

Page 6: ...y Bulb Wet Bulb Dry Bulb Wet Bulb Indoor Operation Range Cooling Maximum C 32 23 32 23 Minimum C 16 11 16 11 Heating Maximum C 30 30 Minimum C 16 16 1 Cooling capacities are based on indoor temperatur...

Page 7: ...l ASG20K1 Motor Type DC 8 poles Input Power W 47 3 Output Power W 40 Speed QLo Cool rpm 790 Heat rpm 790 Lo Cool rpm 870 Heat rpm 870 Me Cool rpm 1070 Heat rpm 1090 Hi Cool rpm 1260 Heat rpm 1300 SHi...

Page 8: ...ooling capacities are based on indoor temperature of 27 C Dry Bulb 80 6 F Dry Bulb 19 0 C Wet Bulb 66 2 F Wet Bulb and outdoor air temperature of 35 C Dry Bulb 95 F Dry Bulb 24 C Wet Bulb 75 2 F Wet B...

Page 9: ...ent A 12 0 Maximum Input Power W 2 73k Starting Current A 6 10 Circuit Breaker Capacity A 16 Dimension Height mm 619 Width mm 824 70 Depth mm 299 Net Weight kg 39 Connection Cable 3 1 Earth 1 5 mm 2 P...

Page 10: ...nge Cooling Maximum C 32 23 Minimum C 16 11 Heating Maximum C 30 Minimum C 16 Outdoor Operation Range Cooling Maximum C 43 26 Minimum C 16 11 Heating Maximum C 24 18 Minimum C 10 11 Note Specification...

Page 11: ...ent A 12 0 Maximum Input Power W 2 73k Starting Current A 6 95 Circuit Breaker Capacity A 16 Dimension Height mm 619 Width mm 824 70 Depth mm 299 Net Weight kg 39 Connection Cable 3 1 Earth 1 5 mm 2 P...

Page 12: ...nge Cooling Maximum C 32 23 Minimum C 16 11 Heating Maximum C 30 Minimum C 16 Outdoor Operation Range Cooling Maximum C 43 26 Minimum C 16 11 Heating Maximum C 24 18 Minimum C 10 11 Note Specification...

Page 13: ...oom 1 Room Indoor Unit Capacity kW Total Indoor Capacity kW Indoor Unit Capacity kW Total Indoor Capacity kW 20 20 40 20 20 20 25 45 25 25 20 32 52 32 32 25 25 50 Indoor Unit CS MRE7 9 12PKE Outdoor U...

Page 14: ...ong piping up to 15 meters 0 75 1 75HP during single split connection only Easy to use remote control Quality Improvement o Random auto restart after power failure for safety restart operation o Gas l...

Page 15: ...15 4 Location of Controls and Components 4 1 Indoor Unit 4 2 Outdoor Unit 4 3 Remote Control...

Page 16: ...16 5 Dimensions 5 1 Indoor Unit...

Page 17: ...17 5 2 Outdoor Unit...

Page 18: ...18 6 Refrigeration Cycle Diagram...

Page 19: ...19 7 Block Diagram 7 1 Indoor Unit...

Page 20: ...20 7 2 Outdoor Unit...

Page 21: ...21 8 Wiring Connection Diagram 8 1 Indoor Unit...

Page 22: ...22 8 2 Outdoor Unit...

Page 23: ...23 9 Electronic Circuit Diagram 9 1 Indoor Unit...

Page 24: ...24 9 2 Outdoor Unit...

Page 25: ...25 10 Printed Circuit Board 10 1 Indoor Unit 10 1 1 Main Printed Circuit Board 10 1 2 Indicator and Receiver Printed Circuit Board...

Page 26: ...26 10 2 Outdoor Unit...

Page 27: ...s of the Outdoor Unit Have Been Changed Accompanying the changes in the shapes of the 3 way valve caps the tightening method has also been changed Firmly tighten the 3 way valve caps by hand and then...

Page 28: ...or Unit Have Been Changed Accompanying the changes in the shapes of the 3 way valve caps the tightening method has also been changed Firmly tighten the 3 way valve caps by hand and then tighten them u...

Page 29: ...vent direct sunlight or rain be careful that heat radiation from the condenser is not obstructed There should not be any animal or plant which could be affected by hot air discharged Keep the spaces i...

Page 30: ...ate horizontally by aligning the marking off line with the thread and using a level gauge 2 Drill the piping plate hole with 70 mm hole core drill o Line according to the left and right side of the in...

Page 31: ...31 12 2 3 1 For the right rear piping 12 2 3 2 For the right and right bottom piping 12 2 3 3 For the embedded piping This can be used for left rear piping and bottom piping also...

Page 32: ...3 Bind all the indoor and outdoor connection cable with tape and route the connection cable via the escapement 4 Remove the tapes and connect the connection cable between indoor unit and outdoor unit...

Page 33: ...cutter and then remove the burrs 2 Remove the burrs by using reamer If burrs is not removed gas leakage may be caused Turn the piping end down to avoid the metal powder entering the pipe 3 Please make...

Page 34: ...to the copper pipe In case of using long piping Connect the piping Align the center of piping and sufficiently tighten the flare nut with fingers Further tighten the flare nut with torque wrench in sp...

Page 35: ...m with a torque wrench 7 Remove the valve caps of both of the 3 way valve Position both of the valves to OPEN using a hexagonal wrench 4 mm 8 Mount valve caps onto the both 3 way valve o Be sure to c...

Page 36: ...equipment must be properly earthed Note Isolating Devices Disconnecting means should have minimum 3 0 mm contact gap Earth wire shall be Yellow Green Y G in colour and longer than other AC wires for...

Page 37: ...nd it is updated continuously whenever the electrical power is supplied to the unit 13 1 2 Cooling Operation 13 1 2 1 Thermostat control Capability supply to indoor unit is OFF Expansion valve closed...

Page 38: ...temperature During operation mode judgment indoor fan motor with speed of Lo and outdoor fan motor are running for 30 seconds to detect the indoor intake and outdoor air temperature The operation mod...

Page 39: ...rection is determined by operation mode heat exchanger temperature and intake air temperature and manual angles of direction can be adjusted using remote control 13 4 1 Vertical Airflow Operation Mode...

Page 40: ...imer can be set using remote control the unit with timer set will stop operate at set time 13 6 Auto Restart Control When the power supply is cut off during the operation of air conditioner the compre...

Page 41: ...onditions o When either one of the start conditions are not complied 14 1 3 Cooling Powerful Operation 1 During cooling operation this control is to concentrate outdoor unit capability to the powerful...

Page 42: ...ooling heating operation this control is to provide fast cooling heating operation compare to normal operation Operation start if all condition below are complied o Powerful operation ON for indoor un...

Page 43: ...or higher than Lo fan o 1 operation indoor unit o In any cooling overload zone o During annual cooling o Initial frequency operation o During starting control o During Electronic part temperature ris...

Page 44: ...during cooling overload condition Start conditions o Outdoor ambient temperature is at protection region as shown in figure below o Outdoor unit total current is above 5 5A 4E 3E 5 0A 2E18 2E15 Contr...

Page 45: ...n This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation 15 7 Extreme Low Temperature Compressor low pressure protection control Heat This contro...

Page 46: ...frequency will increase However if total outdoor unit running current exceeds Y value compressor will be stopped immediately for 3 minutes Operation Mode CU 2RE18PBE CU 2RE15PBE X A Y A X A Y A Coolin...

Page 47: ...all indoor units 15 15 Valve close detection control This control detects 3 way valve close condition to prevent damage to refrigerant cycle Start conditions o For all connected indoor units if Indoor...

Page 48: ...3 REMOTE CONTROL NUMBER SWITCH MODE The Remote Control Number Switch Mode will be activated if the Auto OFF ON button is pressed continuously for more than 11 seconds 3 beep sounds will occur at 11th...

Page 49: ...mote Control Receiving Sound OFF ON Mode is restarted 16 2 Remote Control Button 16 2 1 SET BUTTON To check remote control transmission code and store the transmission code to EEPROM o Press SET butto...

Page 50: ...r and a fan The normal outlet air temperature and pressure of the refrigeration cycle depends on various conditions the standard values for them are shown in the table on the right Normal Pressure and...

Page 51: ...Electric current during operation Low Pressure High Pressure Electric current during operation Insufficient refrigerant gas leakage Clogged capillary tube or Strainer Short circuit in the indoor unit...

Page 52: ...Display Memorized Error Protective Operation Status 1 Turn power on 2 Press the CHECK button on the remote controller continuously for 5 seconds 3 will be displayed on the remote controller display No...

Page 53: ...53 17 3 Self Diagnosis Function...

Page 54: ...54...

Page 55: ...ransmission is checked whether it is normal Malfunction Caused Faulty indoor unit PCB Faulty outdoor unit PCB Indoor unit outdoor unit signal transmission error due to wrong wiring Indoor unit outdoor...

Page 56: ...re interconnected Malfunction Caused Wrong models interconnected Wrong indoor unit or outdoor unit PCBs mounted Indoor unit or outdoor unit PCBs defective Indoor outdoor unit signal transmission error...

Page 57: ...tion Decision Conditions During startup and operation of cooling and heating the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors Malfunction Cause...

Page 58: ...Decision Conditions During startup and operation of cooling and heating the temperatures detected by the outdoor compressor temperature sensor are used to determine sensor errors Malfunction Caused F...

Page 59: ...ons A current transformer CT is detected by checking the compressor running frequency rated frequency and CT detected input current less than 0 65A for continuously 20 seconds Malfunction Caused CT de...

Page 60: ...termine abnormal fan motor feedback of rotation 2550rpm or 50rpm Malfunction Caused Operation stops due to short circuit inside the fan motor winding Operation stops due to breaking of wire inside the...

Page 61: ...Decision Conditions During startup and operation of cooling and heating the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors Malfunction Caused...

Page 62: ...tion Decision Conditions During startup and operation of cooling and heating the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors Malfunction Caused Faul...

Page 63: ...tion Decision Conditions During startup and operation of cooling and heating the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors Malfunction Caused Fau...

Page 64: ...ction Decision Conditions During startup and operation of cooling and heating the temperatures detected by the outdoor heat exchanger temperature sensor are used to determine sensor errors Malfunction...

Page 65: ...lfunction Decision Conditions The supply power is detected for its requirement by the indoor outdoor transmission Malfunction Caused Wrong models interconnected Wrong indoor unit and outdoor unit PCBs...

Page 66: ...ecision Conditions During startup and operation of cooling and heating the temperatures detected by the outdoor gas pipe temperature sensor are used to determine sensor errors Malfunction Caused Fault...

Page 67: ...ration is used to determine abnormal fan motor Malfunction Caused Operation stops due to short circuit inside the fan motor winding Operation stops due to breaking of wire inside the fan motor Operati...

Page 68: ...ture detected by the indoor pipe temperature sensor is above 60 C Malfunction Caused Air short circuit at indoor unit Clogged indoor unit air filter Dust accumulation on the indoor unit heat exchanger...

Page 69: ...takes place when indoor pipe temperature is lower than 2 C Malfunction Caused Air short circuit at indoor unit Clogged indoor unit air filter Dust accumulation on the indoor unit heat exchanger 2 3 w...

Page 70: ...nditions When heating operation when indoor pipe temperature is below 10 C When cooling operation when indoor pipe temperature is above 45 C Malfunction Caused Connector in poor contact Faulty sensor...

Page 71: ...ature and indoor pipe temperature is above 10 C or indoor pipe temperature is below 1 0 C Remark When the indoor standby unit is freezing the outdoor unit transfers F17 error code to the corresponding...

Page 72: ...eration of cooling and heating when Power Factor Correction PFC protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level Malfunction Caused DC voltage peak due to power...

Page 73: ...ality Malfunction Caused Faulty indoor intake air or pipe temperature sensor 2 3 way valve closed Refrigerant shortage refrigerant leakage Clogged expansion valve or strainer Faulty outdoor unit Poor...

Page 74: ...on Decision Conditions A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit Malfunction Caused Compressor terminal disconnect F...

Page 75: ...re data 61 C is detected by the outdoor pipe temperature sensor Malfunction Caused Air short circuit at indoor unit Dust accumulation on the indoor unit heat exchanger 2 3 way valve closed Faulty outd...

Page 76: ...ed o Heat Sink Overheating During operation of cooling and heating when heat sink temperature data 90 C is detected by the heat sink temperature sensor Malfunction Caused IPM overheats due to short ci...

Page 77: ...ing and heating when compressor tank temperature data 112 C is detected by the compressor tank temperature sensor Malfunction Caused Faulty compressor tank temperature sensor 2 3 way valve closed Refr...

Page 78: ...n of cooling and heating when an input over current X value in Total Running Current Control is detected by checking the input current value being detected by current transformer CT with the compresso...

Page 79: ...bleshooting Checking the power transistor Never touch any live parts for at least 10 minutes after turning off the circuit breaker If unavoidable necessary to touch a live part make sure the power tra...

Page 80: ...Ensure that the capacitor has discharged sufficiently before proceeding with repair work Failure to heed this caution may result in electric shocks 18 1 Indoor Electronic Controllers Cross Flow Fan a...

Page 81: ...81 Figure 3 Figure 4 18 1 3 To remove discharge grille Figure 5 10 Pull out to remove the drain hose from the discharge grille 11 Then pull the discharge grille downward gently to dismantle it...

Page 82: ...and indoor fan motor Figure 7 Figure 8 15 Remove the bearing by pulling it out gently 14 Remove the screw from the evaporator 13 Remove the screw that holding the cross flow fan and fan motor axis 12...

Page 83: ...val of cross flow fan Reminder To reinstall the fan motor adjust the fan motor connector to 45 towards you before fixing control board 17 Remove the cross flow fan from the unit by pulling it to the l...

Page 84: ...r remove 1 screw 4 Remove the terminal cover remove 2 screws 5 Remove the terminal cover top and disconnect all the lead wires 3 fasten tab inside 18 2 3 Removing the Control Board 6 Remove the contro...

Page 85: ...cabinet top plate and cabinet front plate 2 Remove the propeller fan by removing the nut turning clockwise at its center 3 Disconnect the connector of the fan motor from the control board 4 Loosen th...

Page 86: ...86 19 Technical Data 19 1 Operation Characteristics CU 2RE15PBE 19 1 1 One Indoor Unit Operation 19 1 1 1 CS MRE7PKE...

Page 87: ...87...

Page 88: ...88 19 1 1 2 CS MRE9PKE...

Page 89: ...89...

Page 90: ...90 19 1 2 Two Indoor Unit Operation 19 1 2 1 CS MRE7PKE x2...

Page 91: ...91...

Page 92: ...92 19 1 2 2 CS MRE9PKE CS MRE7PKE...

Page 93: ...93...

Page 94: ...94 19 2 Operation Characteristics CU 2RE18PBE 19 2 1 One Indoor Unit Operation 19 2 1 1 CS MRE7PKE...

Page 95: ...95...

Page 96: ...96 19 2 1 2 CS MRE9PKE...

Page 97: ...97...

Page 98: ...98 19 2 1 3 CS MRE12PKE...

Page 99: ...99...

Page 100: ...100 19 2 2 Two Indoor Unit Operation 19 2 2 1 CS MRE7PKE x2...

Page 101: ...101...

Page 102: ...102 19 2 2 2 CS MRE9PKE x2...

Page 103: ...103...

Page 104: ...104 19 2 2 3 CS MRE12PKE x2...

Page 105: ...105...

Page 106: ...Exploded View and Replacement Parts List 20 1 Indoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement The non numbered parts are not kept as standard service...

Page 107: ...CO 1 CWH13C1247 26 DISCHARGE GRILLE COMPLETE 1 CWE20C3236 27 BACK COVER CHASSIS 1 CWD933233 28 FULCRUM 1 CWH621131 29 VERTICAL VANE 8 CWE241374 30 CONNECTING BAR 2 CWE261251 33 AIR SWING MOTOR 1 CWA98...

Page 108: ...108 20 2 Outdoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement The non numbered parts are not kept as standard service parts...

Page 109: ...MPLETE 4 WAY VALVE 1 CWA43C2585 O 27 SOUND PROOF BOARD 1 CWH151366 29 SENSOR COMPLETE INTAKE PIPE 1 CWA50C2893 O 31 SENSOR COMPLETE GAS 1 CWA50C3070 O 32 SENSOR COMPLETE DEF 1 CWA50C3069 O 33 HOLDER S...

Page 110: ...CTION 1 CWF615768 65 INSTALLATION INSTRUCTION 1 CWF615769 66 INSTALLATION INSTRUCTION 1 CWF615770 67 INSTALLATION INSTRUCTION 1 CWF615771 68 INSTALLATION INSTRUCTION 1 CWF615772 69 INSTALLATION INSTRU...

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