Mitsubishi Electric Mr.Slim PUZ-A18NHA4 Page 22 Service Manual Download

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The max. cable length may vary depending on the condition of installation, humidity or materials, etc.

Indoor unit-Outdoor unit

Outdoor power supply

Max. 45m, 147ft

AWG15(polar)

Max. 50m, 164ft

AWG13(polar)

Max. 80m, 262ft

AWG13(polar) and S3 separated

Wire No.

Size

Be sure to connect the indoor-outdoor connecting cables directly to the units (no intermediate connections).

Intermediate connections can lead to communication errors if water enters the cables and causes insufficient

insulation to ground or a poor electrical contact at the intermediate connection point.

Indoor unit-Outdoor unit

Indoor/Outdoor separate
power supply

Max. 120m, 393ft

Min. AWG22

Wire No.

Size

The optional indoor power supply terminal kit is necessary.

8-3. INDOOR - OUTDOOR CONNECTING CABLE

Summary of Contents for Mr.Slim PUZ-A18NHA4

Page 1: ...2NHA4 PUZ A18NHA4 BS PUZ A24NHA4 BS PUZ A30NHA4 BS PUZ A36NHA4 BS PUZ A42NHA4 BS PUY A12NHA4 PUY A18NHA4 PUY A24NHA4 PUY A30NHA4 PUY A36NHA4 PUY A42NHA4 PUY A12NHA4 BS PUY A18NHA4 BS PUY A24NHA4 BS PUY A30NHA4 BS PUY A36NHA4 BS PUY A42NHA4 BS Service Ref PUZ A18NHA4 PUZ A24NHA4 PUZ A30NHA4 PUZ A36NHA4 PUZ A42NHA4 PUZ A18NHA4 BS PUZ A24NHA4 BS PUZ A30NHA4 BS PUZ A36NHA4 BS PUZ A42NHA4 BS PUY A12NHA...

Page 2: ... 30 36 42BA4 PLA A12 18 24 30 36 42BA4 OCH482 OCB482 PCA A24 30 36 42KA4 PCA A24 30 36 42KA4 OCH484 OCB484 PKA A12 18HA4 PKA A12 18HA4 OCH483 OCB483 PKA A24 30 36KA4 PKA A24 30 36KA4 TH OCH488 OCB488 PEA A12 18AA4 PEA A12 18AA4 TH HWE0807B PEAD A24 30 36 42AA4 PEAD A24 30 36 42AA4 TH HWE0905A ...

Page 3: ...ot use a charging cylinder If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered Flare tool Electronic refrigerant charging scale Vacuum pump adaptor Size adjustment gauge Gauge manifold Torque wrench Gas leak detector Charge hose Tools for R410A Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc If dirt d...

Page 4: ...y from cylinder Check that cylinder for R410A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance of 5 ...

Page 5: ... Outside diameter Dimension A 0 0 4 Unit mm inch R410A R22 1 4 3 8 1 2 5 8 3 4 6 35 9 52 12 70 15 88 19 05 17 0 43 64 22 0 7 8 26 0 1 3 64 29 0 1 9 64 17 0 22 0 24 0 27 0 36 0 Nominal dimensions inch Flare nut dimensions Outside diameter Dimension B Unit mm inch R410A R22 Gauge manifold Charge hose Gas leak detector Refrigerant recovery equipment Refrigerant cylinder Applied oil Safety charger Cha...

Page 6: ...ax A12 36 70ft 20m max and 16ft 5m min of piping The additional refrigerant charging work during installation often causes problems It is completely eliminated by chargeless system This unique system improves the quality and reliability of the work done It also helps to speed up the installation time PUZ A24 30 36NHA4 PUZ A24 30 36NHA4 BS PUY A24 30 36NHA4 PUY A24 30 36NHA4 BS PUZ A42NHA4 PUZ A42N...

Page 7: ...ling dB 48 48 48 48 51 Heating dB 47 50 50 50 55 Protection devices HP switch HP switch HP switch HP switch HP switch LP switch Comp shell thermo Comp shell thermo Comp shell thermo Comp shell thermo Discharge thermo Dimension W mm 800 950 950 950 950 D mm 300 23 330 30 330 30 330 30 330 30 H mm 600 943 943 943 1350 W in 31 1 2 37 12 32 37 12 32 37 12 32 37 12 32 D in 11 13 16 7 8 13 1 3 16 13 1 3...

Page 8: ... HP switch HP switch HP switch HP switch HP switch LP switch Comp shell thermo Comp shell thermo Comp shell thermo Comp shell thermo Comp shell thermo Discharge thermo Dimension W mm 800 800 950 950 950 950 D mm 300 23 300 23 330 30 330 30 330 30 330 30 H mm 600 600 943 943 943 1350 W in 31 1 2 31 1 2 37 12 32 37 12 32 37 12 32 37 12 32 D in 11 13 16 7 8 11 13 16 7 8 13 1 3 16 13 1 3 16 13 1 3 16 ...

Page 9: ...5 kg 4 7 kg 3 0 kg 94 oz 100 oz 106 oz 112 oz 118 oz 124 oz 130 oz 136 oz 142 oz 148 oz 154 oz 160 oz 166 oz 106 oz 2 7 kg 2 8 kg 3 0 kg 3 2 kg 3 3 kg 3 5 kg 3 7 kg 3 9 kg 4 0 kg 4 2 kg 4 4 kg 4 5 kg 4 7 kg 3 0 kg PUY A30NHA4 BS PUY A30NHA4 PUZ A30NHA4 BS PUZ A30NHA4 PUY A36NHA4 BS PUY A36NHA4 PUZ A36NHA4 BS PUZ A36NHA4 PUY A42NHA4 BS PUY A42NHA4 PUZ A42NHA4 BS PUZ A42NHA4 132 oz 136 oz 142 oz 148...

Page 10: ...dB 0 dB 0 0002 μbar BAND CENTER FREQUENCIES Hz PUY A24 30 36NHA4 PUY A24 30 36NHA4 BS PUZ A24 30 36NHA4 PUZ A24 30 36NHA4 BS COOLING MODE HEATING 48 SPL dB 50 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 μbar BAND CENTER FREQUENCIES Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 PUY ...

Page 11: ...3 179 123 29 21 7A 3 23 0 74 88 1 52 8 2 3 7 6 468 107 191 127 36 15 6A 2 95 0 63 80 7 49 3 2 0 7 6 428 91 177 121 28 Refrigerant circuit Discharge pressure MPa Suction pressure MPa Discharge temperature Condensing temperature Suction temperature Ref Pipe length m 20 4A 2 83 0 82 73 4 47 5 4 9 7 6 410 120 164 118 40 21 5A 2 93 0 69 80 3 47 5 0 3 7 6 425 100 177 118 33 Discharge pressure PSIG Sucti...

Page 12: ...temperature Suction temperature Ref Pipe length m 2 83 0 82 73 4 47 5 4 9 7 6 410 120 164 118 40 Discharge pressure PSIG Suction pressure PSIG Discharge temperature F Condensing temperature F Suction temperature F Ref Pipe length ft 25 25 side Indoor Intake air temperature DB 26 7 26 7 Intake air temperature WB 19 4 14 6 19 4 12 9 Discharge air temperature DB side Outdoor Intake air temperature DB...

Page 13: ... 2 1 Air intake Air discharge 4 oval hole Air intake Service panel Connection for liquid pipe Service panel for charge plug Service port Connection for gas pipe Min 100mm 3 15 16 Min 500mm 19 11 16 Min 350mm 13 25 32 Basically open Max Foundation bolt height FOUNDATION Please secure the unit firmly with 4 foundation M10 W3 8 bolts Bolts washers and nut must be purchased locally 18mm 23 32 W33 1 5 ...

Page 14: ...door wiring Terminal Block Conduit hole 2 27 1 1 16 Knockout Right trunking hole Knockout Right piping hole Knockout 65 2 9 16 92 3 5 8 40 1 9 16 45 1 25 32 19 3 4 27 1 1 16 23 29 32 23 29 32 73 2 7 8 Conduit hole 2 27 1 1 16 Knockout Front trunking hole Knockout Front piping hole Knockout 9 2 3 5 8 Conduit hole 2 27 1 1 16 Knockout Rear trunking hole Knockout Rear piping hole Knockout 220 8 21 32...

Page 15: ...ht trunking hole Knockout Conduit hole 2 27 1 1 16 Knockout 9 2 3 5 8 92 3 5 8 65 2 9 16 45 1 25 32 40 1 9 16 27 1 1 16 55 2 3 16 23 29 32 73 2 7 8 63 2 1 2 Front piping hole Knockout Front trunking hole Knockout Conduit hole 2 27 1 1 16 Knockout 9 2 3 5 8 371 14 19 32 330 13 30 1 3 16 175 6 7 8 600 23 5 8 175 6 7 8 42 1 21 32 66 2 5 8 950 37 13 32 322 12 11 16 1350 53 5 32 635 25 19 3 4 417 16 13...

Page 16: ...1S4 63H TH3 TH6 TH7 TH8 TH32 LEV A CY1 CY2 Terminal Block Power Supply Indoor Outdoor Motor for Compressor Fan Motor Solenoid Valve Four Way Valve High Pressure Switch Thermistor Outdoor Pipe Thermistor Outdoor 2 Phase Pipe Thermistor Outdoor Thermistor Heatsink Thermistor Shell Electronic Expansion Valve Capacitor ACL Reactor Power Circuit Board Connection Terminal U V W Phase P B TABU V W Noise ...

Page 17: ...8 TH32 LEV A ACL Terminal Block Power Supply Indoor Outdoor Motor for Compressor Fan Motor Solenoid Valve Four Way Valve High Pressure Switch SV Solenoid Valve Bypass Valve Thermistor Outdoor Pipe Thermistor Outdoor 2 Phase Pipe Thermistor Outdoor Thermistor Heatsink Thermistor Shell Electronic Expansion Valve Reactor Power Circuit Board Connection Terminal U V W Phase P B TABU V W Noise Filter Ci...

Page 18: ...HA4 MODEL SW6 1 MODEL SELECT The black square indicates a switch position SW5 5 6 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON PUY A30NHA4 PUY A36NHA4 1 2 3 4 5 6 7 8 7 8 7 8 7 8 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 2 2 SW5 1 to 4 Function switch TB1 MC MF1 21S4 63H TH3 TH6 TH7 TH8 TH32 LEV A DCL 52C Terminal Block Power Supply Indoor Outdoor Motor for Compre...

Page 19: ...tor Power Circuit Board Connection Terminal U V W Phase Diode Bridge P B TABU V W Noise Filter Circuit Board Connection Lead L1 Phase Connection Terminal Ground N F LI LO Connection Lead L2 Phase NI NO 52C Relay 52C EI E2 Controller Circuit Board Switch Pump Down Connector Emergency Operation SWP CN31 C B DS2 DS3 Power Module IPM SYMBOL LEGEND NAME SYMBOL NAME SYMBOL NAME Connection Terminal L1 L2...

Page 20: ...e breaker NV 1 Wiring size must comply with the applicable local and national code 2 Use copper supply wires 3 Use wires rated 600V or more for the power supply cables and the indoor outdoor unit connecting cables 4 Install an earth longer than other cables Notes Outdoor unit model Outdoor unit power supply Breaker size Minimum circuit ampacity Maximum rating of overcurrent protective device Outdo...

Page 21: ... 500 m 1500 ft 3 The figures are NOT always against the ground Notes 1 Wiring size must comply with the applicable local and national code 2 Use copper supply wires 3 Use wires rated 300V or more for the power supply cables 4 Install an earth longer than other cables Indoor unit model Indoor unit power supply Minimum circuit ampacity Maximum rating of overcurrent protective device Indoor unit powe...

Page 22: ...t the indoor outdoor connecting cables directly to the units no intermediate connections Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point Indoor unit Outdoor unit Indoor Outdoor separate power supply Max 120m 393ft 2 Min AWG22 Wire No Size The optional ...

Page 23: ... wire Power supply appliance M NET type outdoor unit Central remote controller Power supply appliance M NET type outdoor unit M NET type outdoor unit M NET type outdoor unit M NET transmission wire M NET type outdoor unit M NET type outdoor unit Central remote controller Power supply appliance M NET type outdoor unit M NET transmission wire M NET type outdoor unit M NET type outdoor unit Good exam...

Page 24: ...addresses are 00 1 23 4 5 6 7 8 9 0 1 23 4 5 6 7 8 9 0 1 23 4 5 6 7 8 9 0 1 23 4 5 6 7 8 9 0 1 23 4 5 6 7 8 9 0 1 23 4 5 6 7 8 9 0 1 2 50 M NET Address No Setting example Switching setting SW11 ones digit SW12 tens digit OFF ON 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 ...

Page 25: ...Stop valve 4 way valve Service port check High pressure protect switch Outdoor heat exchanger Thermistor TH3 Thermistor TH6 Distributor Muffler Thermistor TH32 Linear expansion valve Refrigerant flow in cooling Refrigerant flow in heating 50 Strainer 100 Strainer 100 Strainer 4 way valve solenoid coil Heating ON Cooling OFF PUZ A42NHA4 BS Service port check Accumulator Compressor Refrigerant GAS p...

Page 26: ...lator Compressor Refrigerant GAS pipe 12 7 W1 2 Refrigerant LIQUID pipe 6 35 W1 4 Stop valve High pressure protect switch Linear expansion valve Refrigerant flow in cooling Stop valve with service port 50 Strainer 100 Strainer 100 Strainer Thermistor TH32 Service port check Accumulator Compressor Refrigerant GAS pipe 15 88 W5 8 Refrigerant LIQUID pipe 9 52 W3 8 Service port check High pressure pro...

Page 27: ...e refrigerant when moving the indoor unit or the outdoor unit 1 Turn on the power supply circuit breaker wWhen power is supplied make sure that CENTRALLY CONTROLLED is not displayed on the remote controller If CENTRALLY CONTROLLED is displayed the refrigerant collecting pump down cannot be completed normally 2 After the liquid stop valve is closed set the SWP switch on the control board of the out...

Page 28: ... is no abnormality concerning of parts such as electrical component controller board remote controller and etc Re check the abnormal symptom Conduct trouble shooting and ascertain the cause of the trouble according to 10 5 Troubleshooting by inferior phenomena Continue to operate unit for the time being if the cause is not ascertained There is no abnormality concerning of parts such as electrical ...

Page 29: ...ately F1 After startup is displayed green once and red twice blink alternately F3 F5 F9 After startup is displayed green twice and red once blink alternately EA Eb After startup is displayed only green lights up 00 After startup is displayed only green lights up 00 indicates digital display 2 Press TEST button twice 1 Turn on the main power supply 3 Press OPERATION SWITCH button 4 Press AIR DIRECT...

Page 30: ...of remote controller display and current operation mode are displayed 3 Press the button to activate mode then check whether cool air is blown out from the unit 4 Press the button to activate mode then check whether warm air is blown out from the unit 5 Press the button and check whether strong air is blown out from the unit 6 Press the button and check whether the auto vane operates properly 7 Pr...

Page 31: ... that stores error codes the latest check code can be recalled even if it is cancelled by the remote controller or power is shut off Check the error code history for each unit using the remote controller Switch to self diagnosis mode Press the CHECK button twice within 3 seconds The display content will change as shown below Set the unit number or refrigerant address you want to diagnose Press the...

Page 32: ...isplay content will change as shown below Press the FILTER button to start self diagnosis Remote controller self diagnosis result When the remote controller is functioning correctly Check for other possible causes as there is no problem with the remote controller When the remote controller malfunctions Error display 1 NG blinks The remote controller s transmitting receiv ing circuit is defective T...

Page 33: ...ancelled Procedure 1 Press the CHECK button twice 2 Press the temperature buttons 3 Point the remote controller at the sensor on the indoor unit and press the HOUR button 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button Malfunction diagnosis method at maintenance service 10 3 4 Malfunction diagnosis method by wireless remote controller In case of trouble d...

Page 34: ... INDICATOR lamp blinks Check code Number of times Wireless remote controller Wired remote controller Errors detected by unit other than indoor unit outdoor unit etc Symptom Remark 1 Indoor outdoor unit communication error 2 Transmitting error Outdoor unit 3 Open short of outdoor unit thermistors 4 Compressor overcurrent interruption When compressor locked 5 Abnormal high discharging temperature in...

Page 35: ...on outdoor power circuit board A12 A24N Disconnection of connector R or S Refer to 10 9 A30 A42N Disconnection of connector TABT or TABS Refer to 10 9 3 Check connection of the connector CNDC on the outdoor controller circuit board Check connection of the connector LD1 and LD2 for A12 A24N and CNDC for A30 A36N on the outdoor power circuit board Refer to 10 9 4 Check connection of reactor DCL or A...

Page 36: ...number of indoor units that are connected to one outdoor unit If EA is detected 4 6 Turn the power off once and on again to check Replace outdoor controller circuit board indoor controller board or indoor power board if abnormality occurs again 7 Check if refrigerant addresses SW1 3 to SW1 6 on outdoor controller circuit board are overlapping in case of group control system 8 Check transmission pa...

Page 37: ...ear expansion valve Refer to 10 6 7 8 Replace outdoor controller board Case U2 TH4 1102 TH32 1132 High discharging temperature High comp shell temperature 1 Abnormal if discharge temperature thermistor TH4 exceeds 125 257 F or 110 230 F continuously for 5 min utes Abnormal if condenser evaporator tem perature thermistor TH5 exceeds 40 104 F during defrosting and discharge temperature thermistor TH...

Page 38: ...detected during compressor operation Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting 1 Disconnection or contact failure of connector TH4 TH32 on the outdoor controller circuit board 2 Defective thermistor 3 Defective outdoor controller circuit board 1 Check connection of connector TH4 TH32 on the outdoor controller circuit board...

Page 39: ... 24N only 5 Replace ACT module A30 36 42N only 6 Replace outdoor power circuit board A30 36 42N only 7 Check CNAF wiring A30 36 42N only 8 Replace outdoor noise filter circuit board 9 Check CN5 wiring on the outdoor power circuit board Refer to 10 9 0 Check CN2 wiring on the outdoor power circuit board Refer to 10 9 UF 4100 Compressor overcurrent interruption When compressor locked Abnormal if ove...

Page 40: ...to compressor from the outdoor power circuit board and check the output voltage among phases U V W during test run No defect on board if voltage among phases U V V W and W U is same Make sure to perform the voltage check with same performing frequency E0 or E4 Remote controller transmission error E0 signal receiving error E4 1 Abnormal if main or sub remote control ler cannot receive normally any ...

Page 41: ...ng of connection wire between outdoor controller cir cuit board CNMNT and M NET board CN5 2 Check disconnection looseness or breaking of connection wire between outdoor controller cir cuit board CNMNT and M NET board CND 3 Check M NET transmission wiring method E8 6840 Indoor outdoor unit communication error Signal receiving error Outdoor unit 1 Abnormal if outdoor controller circuit board could n...

Page 42: ...d attribute displayed at remote controller indicate the con troller that detected abnormality 1 There are 2 or more same address of controller of out door unit indoor unit FRESH MASTER or LOSSNAY 2 Noise has entered into trans mission signal and signal was transformed Search the unit with same address as abnormali ty occurred If the same address is found turn off the power supply of outdoor unit a...

Page 43: ...nection of transmission connector CN2M of outdoor unit 3 Defective transmitting receiving circuit of outdoor unit or indoor unit Always try the followings when the error A7 occurs 1 Turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more and turn the power on again If mal function was accidental the unit returns to normal 2 Check...

Page 44: ...f same refrig erant system with LOSSNAY is turned off or within 2 min utes of restart abnormality is detected 3 Contact failure of transmis sion wire of indoor unit of LOSSNAY 4 Disconnection of transmission connector CN2M of indoor unit 5 Defective transmitting receiv ing circuit of indoor unit or LOSSNAY 7 If displayed address or attribute is non existent 1 The unit of former address does not ex...

Page 45: ...or Check LED3 on indoor controller board 1 When LED3 is not blinking Check indoor outdoor connecting wire for miswiring Converse wiring of S1 and S2 or break of S3 wiring 2 When LED3 is blinking Indoor outdoor connecting wire is nor mal 4Check LED display on outdoor controller circuit board Refer to 10 10 Check protection device connector 63L and 63H for contact failure Refer to 10 9 Error Code Ab...

Page 46: ... remote controller 12Normal operation For protection of compressor 12Normal operation 4 Even controlling by the wireless remote controller no beep is heard and the unit does not start operat ing Operation display is indicated on wireless remote controller 1The pair number settings of the wireless remote controller and indoor controller board are mismatched 1Check the pair number settings 5 When op...

Page 47: ...osis after turning on the main power Normal The start up diagnosis will be over in around 2 minutes Miswiring of indoor outdoor connecting wire Breaking of indoor outdoor connecting wire S3 Defective indoor controller board Defective outdoor controller circuit board Refer to Self diagnosis action table in order to solve the trouble In case of communication errors the display of remote controller m...

Page 48: ...iring of the outdoor unit Check if the wiring is bad Check if the fuses are blown The fuses on the outdoor controller circuit board will be blown when the indoor outdoor connecting wire short circuits Bad wiring of the outdoor controller board The fuses on the outdoor controller circuit board are blown Check if miswiring breaking or poor contact is causing this problem Indoor outdoor connecting wi...

Page 49: ...rd Replace the outdoor controller circuit board Normal Only the unit which has the refrigerant address 0 supplies power to the remote controller Set the refrigerant address to 0 In case of the multiple grouping system recheck the refrigerant address again Defective indoor power board Replace the indoor power board Defective outdoor power circuit board Replace the outdoor power circuit board Defect...

Page 50: ... contact of the remote controller wire Check the voltage of the terminal block TB5 connecting the remote controller wire If it is not between DC 10V and DC16V the indoor controller board must be defective The remote controller wire short circuits Check if the remote controller wire is short circuited Defective indoor controller board Replace the indoor controller board Diagnosis flow Cause Inspect...

Page 51: ...wice to clear FILTER from the display See the operation manual that came with the product for how to clean the filters STANDBY is displayed on the screen This is displayed when the unit starts HEAT operation when the thermostat puts the compressor in operation mode or when the outdoor unit ends DEFROST operation and returns to HEAT operation The display will automatically disappear around 10 minut...

Page 52: ...utdoor unit is controlling the airflow amount in order to keep the optimum operating condition A sound similar to water flowing is heard from the unit This is not a malfunction This is the sound which is heard when the refrigerant is flowing inside the indoor unit The fan speed does not match the setting of the remote controller in HEAT operation The up down vane will be automatically set to horiz...

Page 53: ...d The airflow direction does not change Up down vane left right louver 1 Check if the vane is set to a fixed position Check if the vane motor connector is removed 2 Check if the air conditioner has a function for switching the air direction 3 If the air conditioner doesn t have that function NOT AVAILABLE will be displayed on the remote controller when AIR DIRECTION or LOUVER button is pressed Som...

Page 54: ...ater drips down Heating water drips down from the heat exchanger Use optional parts Drain Socket and Drain pan if these water needs to be collected and drained out for once Water or moisture is expelled from the outdoor unt Batteries are being exhausted Replace them and press the reset button of remote controller The display of wireless remote controller gets dim or does not come on The indoor uni...

Page 55: ...ay valve 21S4 Motor for compressor MC Linear expansion valve LEV A For A12 18 Linear expansion valve LEV A For A24 42 Normal Abnormal Open or short A18 36 A42 Open or short Disconnect the connector then measure the resistance with a tester Winding temperature 20 68 F Measure the resistance between the terminals with a tester At the ambient temperature 20 68 F Normal 1450 150 Abnormal Open or short...

Page 56: ...ector CNF1 2 Fuse check Check the fuse F5 on outdoor controller board Power supply check Remove the connector CNF1 2 Measure the voltage in the outdoor controller circuit board TEST POINT VDC between 1 and 4 of the fan connector VDC DC250 330V TEST POINT VCC between 5 and 4 of the fan connector VCC DC15V Wiring recovery Replace outdoor controller board Replace the fan motor Replace outdoor control...

Page 57: ... F 104k 50 122 F 70k 60 140 F 48k 70 158 F 34k 80 176 F 24k 90 194 F 17 5k 100 212 F 13 0k 110 230 F 9 8k High temperature thermistor Thermistor Discharge TH4 for A42 Thermistor Shell TH32 for A12 18 24 30 36 0 10 20 30 40 50 20 10 0 10 20 30 40 50 4 14 32 50 68 86 104122 F Temperature Resistance k 500 400 300 200 100 0 25 50 75 100 120 77 122 167 212 248 F Temperature Resistance k 0 32 F 180k 25 ...

Page 58: ...und can be heard than normal situation No sound is heard when the pulse number moves from B to A in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driv er handle while putting the screw driver to the linear expansion valve LEV M 1 6 4 4 3 2 1 2 1 Red Brown Blue Orange Yellow White 3 4 5 6 Connector LEV A DC12V Outdoor controller bo...

Page 59: ...und can be heard than normal situation No sound is heard when the pulse number moves from B to A in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driv er handle while putting the screw driver to the linear expansion valve LEV M 1 6 4 4 3 2 1 1 Gray Orange Red Yellow Black 3 4 5 6 Connector LEV A DC12V Outdoor controller board Driv...

Page 60: ...ure Be sure to attach the stopper to pipe B B A How to attach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and attach the coil by inserting it downward into the main body Then securely attach the coil stop per to pipe B At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stop per is not ...

Page 61: ...stop per to main body At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stopper is not firmly attached to main body coil may be detached from the main body and that can cause defective operation of lin ear expansion valve To prevent piping stress be sure to attach the coil holding the main body of linear expansion valve firmly Otherwise pi...

Page 62: ...n for more than 10 hours Neglecting this could result in freezing the heat exchanger in indoor unit 3 Emergency operation procedure 1 Turn the main power supply off 2 Turn on the emergency operation switch SWE on indoor controller board 3 Set the shorting pins of emergency operation connector CN31 on outdoor controller board to ON 4 Use SW4 2 on outdoor controller board to set the operation mode c...

Page 63: ...gF 30degC 54degF w2 Sub cool SC 5degC 9degF 5degC 9degF w2 w1 If the thermistor temperature data is normal not open short that data is loaded into the control as valid data When the unit enters emergency operation and TH values are mismatched set the thermistors to open short And the unit runs emergency operation with the values listed above w2 If one thermistor is set to open short the values of ...

Page 64: ... history record reset refrigerant address CNDM 1 to 2 Input of low level sound priority mode 1 to 3 Input of external con tact point TH4 Thermistor Discharge A42 only TH3 Thermistor Outdoor pipe TH7 6 Thermistor Outdoor 2 phase pipe CNDC 280V DC 1 3 Outdoor power circuit board VFG TEST POINT 4 Voltage between right pins of PC5C and PC5D pin 3 and pin 4 Same as CNF17 4 VSP TEST POINT 3 Voltage betw...

Page 65: ...C 52C relay signal Connect to the outdoor controller circuit board CN52C CN5 Primary current Connect to the outdoor power circuit board CN5 CNAC1 CNAC2 208 230V AC Connect to the outdoor control ler circuit board CNAC EI Connect to the earth LI NI Voltage of 208 230V AC is input Connect to the terminal block TB1 E3 Connect to the earth E2 Connect to the earth ...

Page 66: ...ler circuit board CN52C CN5 Primary current Connect to the outdoor power circuit board CN5 CNAC1 CNAC2 208 230V AC Connect to the outdoor control ler circuit board CNAC EI E2 Connect to the earth E3 Connect to the earth Outdoor noise filter circuit board PUZ A24NHA4 PUZ A24NHA4 BS PUY A24NHA4 PUY A24NHA4 BS ...

Page 67: ...E2 Connect to the earth LO NO Voltage of 208 230V AC is output Connect to the outdoor power circuit board TABS TABT RS1 CN52C 52C driving signal Connect to the outdoor controller circuit board CN52C CN5 Primary current Connect to the outdoor power circuit board CN5 Outdoor noise filter circuit board PUZ A30 36 42NHA4 PUZ A30 36 42NHA4 BS PUY A30 36 42NHA4 PUY A30 36 42NHA4 BS ...

Page 68: ...e ACL 208 230V AC U V W Connect to the compressor MC Voltage among phases 5V to 180V AC LD9 Connect to the earth Only A24 CN5 Primary current detection Connect to the outdoor noise filter circuit board CN5 CN4 Connect from the outdoor controller circuit board CN4 CN3 Thermistor Heatsink TH8 DIP IPM DIP PFC Brief check of DIP IPM and DIP PFC W Usually they are in a state of being short circuited if...

Page 69: ...e outdoor noise filter circuit board CN5 CNDC 280 380V DC 1 3 Connect to the outdoor controller circuit board TABS TABT Connect to the outdoor noise fil ter circuit board Voltage among phases 208 230V AC Brief check of POWER MODULE W Usually they are in a state of being short circuited if they are broken Measure the resistance in the following points connectors etc If they are short circuited it m...

Page 70: ...e Symptom when the unit is in trouble and Io open less than 1 1 The unit does not operate can not be switched ON and L2 short 100k 1M 1 The breaker operates open W1 1 The unit does not operate can not be switched ON 2 U9 Abnormal stop W2 P and L2 short 100k 1M 1 The breaker operates open W1 1 The unit does not operate can not be switched ON 2 U9 Abnormal stop W2 P and Io short 100k 1M 1 The breake...

Page 71: ... 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 12 13 14 15 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON w1 Forced defrost should be done as follows 1 Change the DIP SW1 1 on the outdoor controller board from OFF to ON 2 Forced defrost will start by the above operation 1 if all these conditions written below are satisfied Heat mode setting 10 minutes have passed since compressor started ope...

Page 72: ...8 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON PUZ A24NHA4 1 2 3 4 5 6 OFF ON PUY A24NHA4 7 8 7 8 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON PUZ A30NHA4 PUZ A36NHA4 MODEL SW6 SW5 5 6 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON PUY A30NHA4 PUY A36NHA4 1 2 3 4 5 6 7 8 7 8 7 8 7 8 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6 OFF ON 1 2 3 4 5 6...

Page 73: ... release Low level sound priority mode and normal operation b Demand control Local wiring Demand control is available by external input In this mode power consumption is decreased within the range of usual 0 100 How to wire Basically the wiring is the same as a Connect an SW1 which is procured at field to the between Orange and Red 1 and 3 of the Adaptor for external signal input PAC SC36NA and in...

Page 74: ...transmitting error is detected by remote controller Remote controller signal receiving error is detected by indoor unit Remote controller transmitting error is detected by indoor unit Serial communication error Communication between outdoor controller board and outdoor power board Communication between outdoor controller board and M NET P C board Communication error of M NET system 1 Error code di...

Page 75: ... value of outdoor thermistors Abnormality of heatsink temperature Check if indoor outdoor units have a short cycle on their air ducts Measure resistance value of outdoor heatsink thermistor TH8 Check the outdoor fan motor Abnormality of voltage Check looseness disconnection and converse connection of compressor wiring Measure resistance value among terminals on compressor using a tester Check the ...

Page 76: ...tponed 3 When the display blinks Inspection code is displayed when compressor stops due to the work of protection devices Display Contents to be inspected When power is turned on F3 F5 F9 E8 E9 EA Eb EC E0 E7 63L connector red is open 63H connector yellow is open 2 connectors 63H 63L are open Indoor outdoor communication error Signal receiving error Outdoor unit Indoor outdoor communication error ...

Page 77: ...hen it is 100 hours or more hundreds digit tens digit and ones digit are displayed by turns Example When 2450 hours 245 10 hours 0 5 secs 0 5secs 2 secs 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Compressor operating current 0 50 LEV A opening pulse 0 480 0 50 wOmit the figures after the decimal fractions 0 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed b...

Page 78: ...play of error unit number and code 37 327 3 164 When the temperature is 100 F or more the hundreds digit tens digit and ones digit are displayed by turns Example When 130 F 0 5 secs 0 5secs 2 secs F A Code display Code display 0 50 When no error history 0 and are displayed by turns When no error history 0 and are displayed by turns 1 ON 2 3 4 5 6 Thermostat ON time 0 999 Test run elapsed time 0 12...

Page 79: ...ls 0 H P 1 Cooling only 0 Single phase 2 3 phase Setting details Defrosting switch Display details 0 Normal 1 For high humidity Example When heat pump 3 phase and defrosting normal are set up 20 is displayed 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 1 Indoor 1 38 190 38 190 39 88 When the temperature is 0 F or less and temperature are displayed by turns F 38 190 39 88 When...

Page 80: ...80 370 180 370 When it is 100V or more hundreds digit tens digit and ones digit are displayed by turns V 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 SW2 setting 1 ON 2 3 4 5 6 Display detail Explanation for display Unit F 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Indoor setting temperature 62 86 Outdoor pipe temperature 2 phase pipe TH6 38 190 Outdoor heatsink temperature TH8 40...

Page 81: ...t code display Blinking During postponement Lighting Cancellation of postponement 00 is displayed in case of no postponement Code display Error code history 3 Oldest Alternate display of abnormal unit number and code When no error history 0 and are displayed by turns 3 Outdoor pipe temperature Liquid TH3 6 Outdoor pipe temperature 2 phase TH6 7 Outdoor outside temperature TH7 8 Outdoor heatsink TH...

Page 82: ...re are displayed by turns Example When 15 F 0 5 secs 0 5 secs 2 secs Outdoor pipe temperature 2 phase TH6 on error occurring 38 190 38 190 39 88 C When the temperature is 0 F or less and temperature are displayed by turns Example When 15 F 0 5 secs 0 5 secs 2 secs Outdoor outside temperature TH7 on error occurring 38 190 38 190 39 88 C When the temperature is 0 F or less and temperature are displa...

Page 83: ... ON 2 3 4 5 6 Discharge superheat on error occurring SHd 0 327 Cooling TH4 or TH32 TH6 Heating TH4 or TH32 TH5 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 degF Minute 15 1 15 4 1 ON 2 3 4 5 6 Normal Overvoltage error Undervoltage error Input current sensor error L1 or L2 phase open error Abnormal power synchronous signal PFC error A12 18 24NHA Overvoltage Undervoltage Overcurrent PFC ACTM error Undervoltage Dis...

Page 84: ...it The ones digit In this digit the total number of activated control is displayed Preventive control for excessive temperature rise of discharge temperature Preventive control for excessive temperature rise of condensing temperature Frosting preventing control Preventive control for excessive temperature rise of heatsink Example The following controls are activated Primary current control Prevent...

Page 85: ...nt to check the data with the air conditioner stopped skip to step 4 L Fixed Hz operation The operating frequency can be fixed to stabilize operation of inverter model If the air conditioner is currently stopped start it by this operation 2 Press the MODE button to select the desired operation mode Display 3 Press the FILTER button to check the setting Display Waiting for stabilization HEAT STABLE...

Page 86: ...ature Comp discharge temperature Outdoor ambient temperature INDOOR UNIT INLET TEMP INDOOR UNIT H EXC TEMP INDOOR UNIT FILTER USE H Indoor room temperature Heat exchanger temperature Filter operating time 12 340 hours Display Waiting for response Flashing After approx 10 seconds 1 1 Refrigerant address 00 Twin Refrigerant address 00 Outdoor unit Indoor unit 02 Indoor unit 01 Outdoor unit Remote co...

Page 87: ...heat exchanger temperature Indoor intake air temperature Cool Classification Item Result Inspection Temperature difference Heat Inspection Temperature difference Stable Unstable F F Stable Unstable F F Fixed Hz operation may not be possible under the following tempera ture ranges A In cool mode outdoor intake air temperature is 104 For higher or indoor intake air temperature is 73 F or lower B In ...

Page 88: ...01 02 03 103 04 104 15 115 16 116 17 117 The setting is applied to all the units in the same refrigerant system 12 1 UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set according to necessity using the remote controller The setting of function for each unit can only be done by the remote controller Select function available from the table 1 1 Functions available when setting th...

Page 89: ...stem set the unit number to 01 referring to 4 setting the indoor unit number When setting functions for a simultaneous twin indoor unit system set the unit number to 01 to 03 for each indoor unit in case of selecting different functions for each unit referring to 4 setting the indoor unit number When setting the same functions for an entire simultaneous Twin indoor unit system set refrigerant addr...

Page 90: ... setting Press Specified indoor unit FAN operation Change refrigerant address or unit No Switch to function setting mode Press and at the same time with stop the remote controller 12 1 1 Selecting functions using the wired remote controller First try to familiarize yourself with the flow of the function selection procedure In this section an example of setting the room temperature detection positi...

Page 91: ...and blinks in the unit number display area and the refrigerant address display area also blinks there are no units that corre spond to the selected unit number In this case the refrigerant address and unit number may be incorrect so repeat steps and to set the correct ones When grouping different refrigerant systems if an indoor unit other than the one to which the refrigerant address has been set...

Page 92: ...0 Direct the wireless remote controller toward the receiver of the indoor unit and press the button 3 Set the unit number Press the temp button to set the unit number Press 01 to specify the indoor unit whose unit number is 01 Direct the wireless remote controller toward the receiver of the indoor unit and press the button If a unit number that cannot be recognized by the unit is entered 3 beeps o...

Page 93: ...ot displayed when the operation mode is selected 4 3 Mode selection setting 1 Remote controller main sub setting To switch the setting press the ON OFF button Main The controller will be the main controller Sub The controller will be the sub controller 2 Use of clock setting To switch the setting press the ON OFF button ON The clock function can be used OFF The clock function cannot be used 3 Time...

Page 94: ... selected The temperature range limit is not active Initial setting value The temperature range can be changed on cooling dry mode The temperature range can be changed on heating mode The temperature range can be changed on automatic mode The remote controller will be the main controller Initial setting value The remote controller will be the sub controller The clock function can be used Initial s...

Page 95: ...L SELECT blinks 2 Press the button F blinks 3 Press the button C blinks 4 Press the set button with something sharp at the end MODEL SELECT is lighted for 3 seconds then turned off AUTO START ON OFF TEMP FAN VANE TEST RUN AUTO STOP AUTO START h min LOUVER MODE CHECK RESET SET CLOCK MODEL SELECT NOT AVAILABLE SWING CHECK FAN TEST RUN F C AMPM STOP START AMPM COOL DRY AUTO FAN HEAT ...

Page 96: ...ttons and to select the desired refrigerant address Screen 4 Press the CLOCK buttons and to set the desired request code No 5 Press the FILTER button to perform data request The requested data will be displayed at in the same way as in maintenance mode Data collected during operation of the remote controller will be displayed The collected data such as temperature data will not be updated automati...

Page 97: ...take air temperature Unit No 1 Heat mode 4 deg correction Indoor unit Intake air temperature Unit No 2 Heat mode 4 deg correction Indoor unit Intake air temperature Unit No 3 Heat mode 4 deg correction Indoor unit Intake air temperature Unit No 4 Heat mode 4 deg correction Indoor unit Liquid pipe temperature Unit No 1 Indoor unit Liquid pipe temperature Unit No 2 Indoor unit Liquid pipe temperatur...

Page 98: ...r unit Error postponement history 2 previous Outdoor unit Error postponement history 3 last but one 0 255 Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode 0000 Not connected Examples Ver 5 01 Auxiliary information displayed after version information Examples Ver 5 01 A000 Disp...

Page 99: ... 2 second to last Error history 3 third to last Abnormal thermistor display TH3 TH6 TH7 TH8 Operation mode at time of error Compressor Operating current at time of error Compressor Accumulated operating time at time of error Compressor Number of operation times at time of error Discharge temperature at time of error Outdoorunit Liquidpipe1temperature TH3 attimeoferror Outdoor unit Liquid pipe 2 te...

Page 100: ...g time Fan motor ON time Indoor fan output value Sj value Indoor fan output value Pulsation ON OFF Indoor fan output value duty value Indoor unit Model setting information Indoor unit Capacity setting information Indoor unit SW3 information Wireless pair No indoor control board side setting Indoor unit SW5 information Indoor unit Microprocessor version information Indoor unit Microprocessor versio...

Page 101: ...isplay area C 4 Relay output state Operation mode Indoor unit Control state Request code 50 Data display Operation mode Display Operation mode 0 STOP FAN C COOL DRY H HEAT d DEFROST Relay output state Display Power currently Compressor Four way valve Solenoid valve supplied to compressor Unit No 4 state Unit No 3 state Unit No 2 state Unit No 1 state Display State 0 Normal 1 Preparing for heat ope...

Page 102: ...play SV1 Four way valve Compressor 0 1 2 3 4 5 6 7 8 9 A b C d E F ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON Actuator output state Display 52C SV2 SS 0 1 2 3 4 5 6 7 ON ON ON ON ON ON ON ON ON ON ON ON Error content U9 Request code 55 Data display Error content Error content 0 0 Error content Detected Display Overvoltage Undervoltage L1 phase P...

Page 103: ...ty setting display Request code 70 Data display Capacity 10 18 9 12 11 24 14 30 20 36 25 42 Outdoor unit Setting information Request code 71 Data display Setting information Setting information 0 0 Setting information Display Defrost mode 0 Standard 1 For high humidity Setting information Display Single Heat pump 3 phase cooling only 0 Single phase Heat pump 1 Cooling only 2 3 phase Heat pump 3 Co...

Page 104: ... 0 1 1 0 0 0 0 1 0 1 0 0 0 1 1 1 0 0 0 1 0 0 1 0 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 1 1 0 0 1 0 0 0 1 0 1 1 0 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 0 1 1 0 1 1 0 1 1 0 1 0 1 1 1 0 1 1 1 1 1 0 1 0 0 0 0 1 1 1 0 0 0 1 1 0 1 0 0 1 1 1 1 0 0 1 1 0 0 1 0 1 1 1 0 1 0 1 1 0 1 1 0 1 1 1 1 1 0 1 1 0 0 0 1 1 1 1 0 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 0 0 1 1 1 1 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 Outdoor unit switch set...

Page 105: ...5 35 16 36 17 37 18 38 19 39 1A 3A 1b 3b 1C 3C 1d 3d 1E 3E 1F 3F Indoor unit Capacity setting information Request code 163 Data display 0 0 See the table on the right Display Capacity setting state Display Capacity setting state 00 10 42 01 11 02 12 03 13 04 14 05 15 06 12 16 07 17 08 18 09 18 19 0A 1A 0b 24 1b 0C 1C 0d 30 1d 0E 1E 0F 36 1F Display Pair No setting state 00 No 0 01 No 1 J41 disconn...

Page 106: ...and 3 from the rear side and detach the back panel 2 Removing the fan motor 1 Remove the top panel See Photo 1 2 Remove the front panel See Photo 1 3 Remove 1 nut M6 left screw and detach the propeller 4 Disconnect the connector CNF1 on the controller circuit board in the electrical parts box 5 Loosen the clamp for the lead wire in the motor support 6 Remove 4 fan motor fixing screws 4 18 and deta...

Page 107: ...thermistor Outdoor TH7 3 Removing the electrical parts box 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the front panel See Photo 1 4 Disconnect the indoor outdoor connecting wire from terminal block 5 Remove all the following connectors from controller circuit board fan motor linear expansion valve thermistor Outdoor pipe thermistor Shell thermistor Outdoor 2...

Page 108: ...lectrical parts box See Photo 5 6 Remove the sound proof cover upper for compressor 6 Pull out the thermistor Shell TH32 from the holder of the compressor shell 7 Removing the 4 way valve coil 21S4 and linear expansion valve coil LEV A 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the front panel See Photo 1 4 Remove the conduit cover and cord cover 5 Remove th...

Page 109: ...ing the four way valve cover it with a wet cloth to prevent it from heating 250 F or more then braze the pipes so that the inside of pipes are not oxidized Photo 10 Photo 11 10 Removing the high pressure switch 63H 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the front panel See Photo 1 4 Remove the conduit cover and cord cover See Photo 2 5 Remove the back pa...

Page 110: ...ompressor fixing nuts by using spanner or adjustable wrench 11 Remove the welded pipe of motor for compressor inlet and outlet Note Recover refrigerant without spreading it in the air Accumulator leg fixing screw Accumulator leg 13 Removing the accumulator 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the front panel See Photo 1 4 Remove the conduit cover and c...

Page 111: ... indoor outdoor connecting wire from termi nal block 4 Remove all the following connectors from controller circuit board fan motor linear expansion valve thermistor Outdoor pipe thermistor Shell thermistor Outdoor 2 phase pipe thermistor Outdoor high pressure switch 4 way valve and bypass valve Then remove a screw 4 8 from the valve bed to remove the lead wire Pull out the disconnected wire from t...

Page 112: ...lder Note In case of replacing thermistor Outdoor TH7 replace it together with thermistor Outdoor 2 phase pipe TH6 since they are combined together Refer to No 4 above to remove thermistor Outdoor 2 phase pipe Photo 6 6 Removing the thermistor Outdoor pipe TH3 1 Remove the service panel See Figure 1 2 Disconnect the connector TH3 white on the controller circuit board in the electrical parts box 3 ...

Page 113: ...Remove the 4 way valve coil See Photo 8 7 Recover refrigerant 8 Remove the welded part of 4 way valve Note 1 Recover refrigerant without spreading it in the air Note 2 The welded part can be removed easily by remov ing the right side panel Note 3 When installing the 4 way valve cover it with a wet cloth to prevent it from heating 250 F or more then braze the pipes so that the inside of pipes are n...

Page 114: ... parts box Photo 10 Reactor fixing screw 12 Removing the high pressure switch 63H 1 Remove the service panel See Figure 1 2 Remove the top panel See Figure 1 3 Remove the electrical parts box See Photo 3 4 Remove 3 right side panel fixing screws 5 12 in the rear of the unit and remove the right side panel 5 Pull out the lead wire of high pressure switch 6 Recover refrigerant 7 Remove the welded pa...

Page 115: ... Figure 1 2 Remove the top panel See Figure 1 3 Remove 2 front cover panel fixing screws 5 12 and remove the front cover panel See Photo 3 4 Remove 2 back cover panel fixing screws 5 12 and remove the back cover panel 5 Remove the electrical parts box See Figure 1 6 Remove 3 valve bed fixing screws 4 10 4 ball valve and stop valve fixing screws 5 16 then remove the valve bed 7 Remove 3 right side ...

Page 116: ...wing connectors from controller circuit board fan motor linear expansion valve thermistor Outdoor pipe thermistor Discharge thermistor Outdoor 2 phase pipe thermistor Outdoor high pressure switch low pressure switch 4 way valve coil Then remove a screw 4 8 from the valve bed to remove the lead wire Pull out the disconnected wire from the electrical parts box Diagram symbol in the connector housing...

Page 117: ...3 white and TH4 white on the controller circuit board in the electrical parts box 3 Loosen the clamp for the lead wire in the rear of the electrical parts box See Photo 4 4 Pull out the thermistor Outdoor pipe TH3 and thermistor Discharge TH4 from the sensor holder Electrical parts box Photo 5 Thermistor Discharge TH4 Thermistor Outdoor pipe TH3 Compressor MC Lead wire of thermistor Outdoor TH7 Se...

Page 118: ...1 Recover refrigerant without spreading it in the air Note 2 The welded part can be removed easily by remov ing the right side panel Note 3 When installing the 4 way valve cover it with a wet cloth to prevent it from heating 250 F or more then braze the pipes so that the inside of pipes are not oxidized 9 Removing linear expansion valve 1 Remove the service panel See Figure 1 2 Remove the top pane...

Page 119: ...top panel See Figure 1 3 Remove 3 right side panel fixing screws 5 12 in the rear of the unit and remove the right side panel 4 Pull out the lead wire of high pressure switch and low pressure switch 5 Recover refrigerant 6 Remove the welded part of high pressure switch and low pressure switch Note 1 Recover refrigerant without spreading it in the air Note 2 The welded part can be removed easily by...

Page 120: ...emove the top panel See Figure 1 3 Remove 2 front cover panel fixing screws 5 12 and remove the front cover panel See Photo 3 4 Remove 2 back cover panel fixing screws 5 12 and remove the back cover panel 5 Remove the electrical parts box See Photo 3 6 Remove 3 valve bed fixing screws 4 10 4 ball valve and stop valve fixing screws 5 16 then remove the valve bed 7 Remove 3 right side panel fixing s...

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Mitsubishi Electric Mr.Slim PUZ-A18NHA4, Service Manual

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