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Mitsubishi Electric Mr.Slim PUY-A12NHA4R1, Service Manual, Page: 118 / 132

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Mitsubishi Electric Mr.Slim PUY-A12NHA4R1 Service Manual Download Page 118

118

 7.  

Removing the 4-way valve coil (21S4) and linear expansion 
valve coil (LEV-A)

 

(1) Remove the service panel. (See Figure 1)

 

(2) Remove the top panel. (See Figure 1)

 

[Removing the 4-way valve coil]

 

(3) Remove 4-way valve coil fixing screw (M4 × 6).

 

(4) Remove the 4-way valve coil by sliding the coil toward you.

 

(5) Disconnect the connector 21S4 (green) on the controller 

circuit board in the electrical parts box.

 

[Removing the linear expansion valve coil]

 (3) 

 

Remove the linear expansion valve coil by sliding the coil 
upward.

 (4) 

 

Disconnect the connectors, LEV-A (white), on the controller 
circuit board in the electrical parts box.

  8. Removing the 4-way valve

 

(1) Remove the service panel. (See Figure 1)

 

(2) Remove the top panel. (See Figure 1)

 (3) 

 

Remove 3 valve bed fixing screws (4 × 10), 4 ball valve 
and stop valve fixing screws (5 × 16), then remove the 
valve bed.

 (4) 

 

Remove 4 right side panel fixing screw (5 × 12) in the rear 
of the unit and then remove the right side panel.

 

(5) Remove the 4-way valve coil. (See Photo 7)

 

(6) Recover refrigerant.

 

(7) 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 

removing 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 panel. (See Figure 1)

 (3) 

 

Remove 3 valve bed fixing screws (4 × 10), 4 ball valve 
and stop valve fixing screws (5 × 16), then remove the 
valve bed.

 (4) 

 

Remove 4 right side panel fixing screw (5 × 12) in the rear 
of the unit and then remove the right side panel.

 

(5) Remove the linear expansion valve. (See Photo 7)

 

(6) Recover refrigerant.

 

(7) Remove the welded part of linear expansion valve.

Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by 

removing the right side panel.

Note 3: When installing the linear expansion 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 7

4-way valve 

Linear expansion 
valve coil (LEV-A)

Linear expansion 
valve

4-way way 
valve coil

4-way valve coil
fixing screw 

OPERATING PROCEDURE

PHOTOS

OCH481C

Summary of Contents for Mr.Slim PUY-A12NHA4R1

Page 1: ...UY 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 A18NHA4R1 PUZ A24NHA4 PUZ A30NHA4 PUZ A36NHA4 PUZ A42NHA4 PUZ A18NHA4 BS PUZ A18NHA4R1 BS PUZ A24NHA4 BS PUZ A30NHA4 BS PUZ A36NHA4 BS PUZ A42NHA4 BS PUY A12NHA4 PUY A12NHA4R1 PUY A18NHA4 PUY A18NHA4R1 PUY A24NHA4 PUY A30NHA4 PUY A36NHA4 PUY A42NH...

Page 2: ...tectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply beaker Discharge the condenser before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold are...

Page 3: ...can cause deterio ration of refrigerant oil etc Do not use refrigerant other than R410A If other refrigerant R22 etc is used chlorine in refrige rant can cause deterioration of refrigerant oil etc Use a vacuum pump with a reverse flow check valve Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc Use the following tools specifically designe...

Page 4: ...om 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 09MP...

Page 5: ...side 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 Charge ...

Page 6: ...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 A42NHA4 BS PUY...

Page 7: ...ing 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: ...ch 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 1...

Page 9: ... 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: ...B 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 A...

Page 11: ...9 123 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 Suction p...

Page 12: ...erature 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 35 ...

Page 13: ...t and left sides of the unit 1 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 purchas...

Page 14: ... 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 32 145...

Page 15: ...runking 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 32 ...

Page 16: ...mpressor 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 Filter Circuit Board Connection Terminal L1 Phase Connection Terminal Ground N F LI LO Connection ...

Page 17: ...32 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 Circui...

Page 18: ...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 Compressor...

Page 19: ...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 Pha...

Page 20: ...3 Outdoor unit L1 L2 4 Indoor unit Outdoor unit S1 S2 4 Indoor unit Outdoor unit S2 S3 4 Remote controller Indoor unit 4 A12 A18 A24 A30 A36 A42 Single 208 230 V 60 Hz Single 208 230 V 60 Hz Single 208 230 V 60 Hz Single 208 230 V 60 Hz Single 208 230 V 60 Hz Single 208 230 V 60 Hz 15A 15A 25A 30A 30A 30A 13A 13A 18A 25A 25A 26A 15A 20A 30A 40A 40A 40A 2 Min AWG 14 2 Min AWG 14 2 Min AWG 12 2 Min ...

Page 21: ... 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 power supply Indoor unit power supply earth Indoor unit Outdoor unit Indoor unit earth Remote controller Indoor unit Indoor unit...

Page 22: ...e 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 indo...

Page 23: ...e 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 example ...

Page 24: ...esses 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 3 4 ...

Page 25: ... 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 pipe 15 88 W5...

Page 26: ... Check Accumulator 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...

Page 27: ...is a gas leak Look for the source of the gas leak Stop valve Liquid side Stop valve Gas side Service port Open Close section Local pipe Sealed same way for gas side Pipe cover Do not use a wrench here Refrigerant leakage may result Use 2 wrenches here 1 Refrigerant collecting pump down Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit 1 Sup...

Page 28: ...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 11 5 Troubleshooting of problems Continue to operate unit for the time being if the cause is not ascertained There is no abnormality concerning of parts such as electrical component cont...

Page 29: ...y 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 DIRECTION ...

Page 30: ... 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 Pres...

Page 31: ...t 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 TEM...

Page 32: ...ay 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 The r...

Page 33: ...ed 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 11 3 4 Malfunction diagnosis method by IR wireless remote controller In case of trouble duri...

Page 34: ...TOR lamp blinks Check code Number of times IR 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 insuff...

Page 35: ...utdoor power circuit board A12 A24N Disconnection of connector R or S Refer to 11 9 A30 A42N Disconnection of connector TABT or TABS Refer to 11 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 11 9 4 Check connection of reactor DCL or ACL A...

Page 36: ...er 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 path a...

Page 37: ...expansion valve Refer to 11 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 TH4 ex...

Page 38: ...f connector TH4 TH32 on the outdoor controller circuit board Check breaking of the lead wire for thermistor TH4 TH32 Refer to 11 9 2 Check resistance value of thermistor TH4 TH32 or temperature by microprocessor Thermistor TH4 TH32 Refer to 11 6 SW2 on A Control Service Tool Refer to 11 10 3 Replace outdoor controller board U4 TH3 5105 TH6 5107 TH7 5106 TH8 5110 Open short of outdoor unit thermist...

Page 39: ...5 Defective outdoor power board 6 Dip Switch setting for selecting model is incorrect on the outdoor power circuit board 1 Open stop valve 2 Check facility of power supply 3 Correct the wiring U V W phase to compressor Refer to 11 9 Outdoor power circuit board 4 Check compressor Refer to 11 6 5 Replace outdoor power circuit board 6 Check that the Dip Switch setting is cor rect on the outdoor power...

Page 40: ...essor 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 trans mi...

Page 41: ... 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 not re...

Page 42: ...ttribute displayed at remote controller indicate the controller 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 and i...

Page 43: ...ion 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 add...

Page 44: ...me 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 exist ...

Page 45: ...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 normal 4 Check LED display on outdoor controller circuit board Refer to 11 10 Check protection device connector 63L and 63H for contact failure Refer to 11 9 Error Code Abnor...

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

Page 47: ... 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 may n...

Page 48: ...g 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 wire i...

Page 49: ...eplace 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 Defective ...

Page 50: ...tact 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 Inspection ...

Page 51: ... 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 minutes l...

Page 52: ...or 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 horizonta...

Page 53: ...e 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 Somethi...

Page 54: ...rips 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 IR wireless remote controller gets dim or does not come on The indoor unit d...

Page 55: ...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 Solenoid valve coil Bypass valve SV F...

Page 56: ...r 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 controller ...

Page 57: ...04k 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 77 F...

Page 58: ...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 board ...

Page 59: ...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 Drive ci...

Page 60: ...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 firm...

Page 61: ... 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 pipe m...

Page 62: ...r 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 cooli...

Page 63: ... 54 F 30 C 54 F w2 Sub cool SC 5 C 9 F 5 C 9 F 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 SHd SC wi...

Page 64: ...itch SW1 Forced defrost detect 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...

Page 65: ...output Connect to the ACL CN52C 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 OCH481C ...

Page 66: ...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 OCH481C ...

Page 67: ...onnect 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 OCH481C ...

Page 68: ...t board CNDC R S Connect to the 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 sta...

Page 69: ...tdoor 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 means...

Page 70: ...mptom 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 breaker op...

Page 71: ... 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 operati...

Page 72: ...F 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 OFF...

Page 73: ...ease 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 insula...

Page 74: ...smitting 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 displa...

Page 75: ...lue 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 con...

Page 76: ...ed 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 Tran...

Page 77: ...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 by tu...

Page 78: ... 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 0 120 0 ...

Page 79: ... 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 the...

Page 80: ...V 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 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 40 327 F F F 38 190 39 88 When the temperature is 0 F or less and temperature are displayed by turns 40 327 40 164 When the temperature i...

Page 81: ...de 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 TH8 1 ...

Page 82: ...re 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 displayed ...

Page 83: ... 5 6 Discharge superheat on error occurring SHd 32 360 Cooling TH4 or TH32 TH6 Heating TH4 or TH32 TH5 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 F 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 Display exampl...

Page 84: ...he 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 Preventive ...

Page 85: ...o 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 MOD...

Page 86: ...e 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 contro...

Page 87: ... 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 heat...

Page 88: ...2 03 103 04 104 15 115 16 116 17 117 The setting is applied to all the units in the same refrigerant system 13 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 the un...

Page 89: ...ndent system 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 refriger...

Page 90: ...ting 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 13 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 position i...

Page 91: ... 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 to...

Page 92: ...ect the IR 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 IR 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 ...

Page 93: ...isplayed 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 Timer fu...

Page 94: ...ected 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 setti...

Page 95: ...ELECT 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 OCH481C ...

Page 96: ...s 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 automaticall...

Page 97: ... 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 temperature Un...

Page 98: ...it 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 Displays...

Page 99: ...econd 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 temper...

Page 100: ...me 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 version in...

Page 101: ...ay 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 operati...

Page 102: ... 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 Power...

Page 103: ...etting 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 Coolin...

Page 104: ... 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 setting...

Page 105: ... 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 disconnecte...

Page 106: ...e 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 detach the fan motor See Photo 3 Photo 1 P...

Page 107: ...mistor 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 pha...

Page 108: ...rical 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 the ba...

Page 109: ...he 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 panel S...

Page 110: ...mpressor 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 co...

Page 111: ...l See Figure 1 3 Disconnect the indoor outdoor connecting wire from terminal 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 Pull out the disconnected wire from the electrical parts box Diagram symbo...

Page 112: ... 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 Loos...

Page 113: ...move 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 removing 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 ...

Page 114: ...ts 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 part o...

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 p...

Page 116: ... 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 Fan motor CNF1...

Page 117: ...ite 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 Sensor...

Page 118: ...ecover refrigerant without spreading it in the air Note 2 The welded part can be removed easily by removing 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 panel Se...

Page 119: ...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 rem...

Page 120: ... 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 screw 5 12 in the rear of the unit and then remove the right side panel 8 Recover...

Page 121: ... 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 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 A18NHA4R1 PUZ A24NHA4 PUZ A30NHA4 PUZ A36NHA4 PUZ A42NHA4 PUZ A18NHA4 BS PUZ A...

Page 122: ...PUZ A18NHA4R1 PUY A12NHA4 PUY A12NHA4R1 PUY A18NHA4 PUY A18NHA4R1 1 2 3 4 6 7 8 9 10 11 23 15 16 14 17 18 19 21 20 13 1 RoHS PARTS LIST 12 22 5 PUZ A18NHA4 BS PUZ A18NHA4R1 BS PUY A12NHA4 BS PUY A12NHA4R1 BS PUY A18NHA4 BS PUY A18NHA4R1 BS OCB481B ...

Page 123: ... 1 1 1 1 1 1 1 1 1 1 1 11 G R01 E36 242 LINER EXPANSION VALVE COIL 1 1 1 1 1 1 1 1 1 1 1 1 LEV A 12 G R01 E12 403 CHARGE PLUG 1 1 1 1 1 1 G R01 E12 413 CHARGE PLUG 1 1 1 1 1 1 13 G T7W E07 208 HIGH PRESSURE SWITCH 1 1 1 1 1 1 1 1 1 1 1 1 63H 14 G R01 E97 202 THERMISTOR OUTDOOR 2 PHASE PIPE OUTDOOR 1 1 1 1 1 1 1 1 1 1 1 1 TH6 7 15 G R01 E30 403 4 WAY VALVE 1 1 1 1 16 G T7W E33 242 SOLENOID COIL 4 W...

Page 124: ...36NHA4 PUY A24NHA4 PUY A30NHA4 PUY A36NHA4 PUZ A24NHA4 BS PUZ A30NHA4 BS PUZ A36NHA4 BS PUY A24NHA4 BS PUY A30NHA4 BS PUY A36NHA4 BS 1 2 3 4 6 7 8 9 10 11 12 23 7 15 16 17 18 19 20 22 21 14 25 26 19 20 21 23 A24 A30 36 13 5 24 RoHS PARTS LIST OCB481B ...

Page 125: ... 1 1 1 1 13 G R01 N03 202 THERMISTOR OUTDOOR PIPE 1 1 1 1 TH3 G R01 N01 202 THERMISTOR OUTDOOR PIPE 1 1 1 1 1 1 1 1 TH3 14 G R01 H22 401 EXPANSION VALVE 1 1 1 1 1 1 1 1 1 1 1 1 15 G R01 E50 242 LINER EXPANSION VALVE COIL 1 1 1 1 1 1 1 1 1 1 1 1 LEV A 16 G R01 E28 403 4 WAY VALVE 1 1 1 1 1 1 17 G R01 E94 202 THERMISTOR OUTDOOR 2 PHASE PIPE OUTDOOR 1 1 1 1 1 1 1 1 1 1 1 1 TH6 7 18 G T7W E59 408 HEAT...

Page 126: ...6 FUNCTIONAL PARTS PUZ A42NHA4 PUY A42NHA4 PUZ A42NHA4 BS PUY A42NHA4 BS 11 3 5 6 9 2 8 1 7 10 12 14 15 16 18 19 20 21 22 23 24 4 1 17 25 13 26 RoHS PARTS LIST OCB481B ...

Page 127: ...G 1 1 1 1 13 G R 0 1 H 0 0 2 0 2 THERMISTOR OUTDOOR PIPE 1 1 1 1 TH3 14 G R 0 1 E 0 0 2 0 9 LOW PRESSURE SWITCH 1 1 1 1 63L 15 G R 0 1 H 2 0 4 0 1 EXPANSION VALVE 1 1 1 1 16 G R 0 1 E 5 0 2 4 2 LINEAR EXPANSION VALVE COIL 1 1 1 1 LEV A 17 G T 7 W E 0 7 2 0 8 HIGH PRESSURE SWITCH 1 1 1 1 63H 18 G T 7 W E 1 0 4 1 3 CHARGE PLUG 1 1 1 1 19 G R 0 1 E 9 4 2 0 2 THERMISTOR OUTDOOR 2 PHASE PIPE OUTDOOR 1 ...

Page 128: ...R 0 1 E 2 5 6 6 8 FRONT PANEL 1 1 1 1 1 1 1 1 1 1 1 1 3 G R 0 1 E 3 4 6 8 6 BASE ASSY 1 1 1 1 1 1 G R 0 1 E 4 8 6 8 6 BASE ASSY 1 1 1 1 1 1 4 G T 7 W E 0 0 6 1 7 CONDUIT PLATE 1 1 1 1 1 1 1 1 1 1 1 1 5 G T 7 W E 0 3 6 6 7 SERVICE PANEL 1 1 1 1 1 1 1 1 1 1 1 1 6 G R 0 1 E 0 1 5 1 8 SERVICE PANEL FOR CHARGE PLUG 1 1 1 1 1 1 1 1 1 1 1 1 7 G T 7 W E 0 0 6 4 9 CORD COVER 1 1 1 1 1 1 1 1 1 1 1 1 8 G T 7...

Page 129: ... 1 1 1 1 1 1 1 1 1 3 G T 7 W E 0 5 6 6 7 FRONT PANEL 1 1 1 1 1 1 1 1 1 1 1 1 4 G R 0 1 E 3 3 6 8 6 BASE ASSY 1 1 1 1 1 1 1 1 1 1 1 1 5 G R 0 1 E 1 2 1 3 0 MOTOR SUPPORT 1 1 1 1 1 1 1 1 1 1 1 1 6 G R 0 1 E 0 1 6 5 5 HANDLE 2 2 2 2 2 2 2 2 2 2 2 2 7 G R 0 1 E 4 0 6 5 8 COVER PANEL FRONT 1 1 1 1 1 1 1 1 1 1 1 1 8 G R 0 1 E 2 4 6 5 8 COVER PANEL REAR 1 1 1 1 1 1 1 1 1 1 1 1 9 G R 0 1 E 0 5 6 6 1 SIDE ...

Page 130: ...10 1 3 6 8 9 10 4 5 7 6 12 13 2 11 STRUCTURAL PARTS PUZ A42NHA4 PUY A42NHA4 PUZ A42NHA4 BS PUY A42NHA4 BS 14 RoHS PARTS LIST OCB481B ...

Page 131: ... 4 G R 0 1 E 2 6 6 8 6 BASE ASSY 1 1 1 1 5 G R 0 1 E 1 9 1 3 0 MOTOR SUPPORT 1 1 1 1 6 G R 0 1 E 0 1 6 5 5 HANDLE 2 2 2 2 7 G R 0 1 E 1 3 6 5 8 COVER PANEL FRONT 1 1 1 1 8 G R 0 1 E 2 4 6 5 8 COVER PANEL REAR 1 1 1 1 9 G R 0 1 E 3 4 6 6 1 SIDE PANEL R 1 1 1 1 10 G T7W E08 668 SERVICE PANEL 1 1 1 1 11 G R 0 1 E 0 7 6 9 8 REAR GUARD 1 1 1 1 12 G R 0 1 E 2 9 6 4 1 TOP PANEL 1 1 1 1 13 G R 0 1 E 0 2 6...

Page 132: ...ight 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar 2014 No OCB481 REVISED EDITION B Distributed in Jul 2012 No OCB481 REVISED EDITION A Distributed in Nov 2010 No OCB481 Made in Japan New publication effective Mar 2014 Specifications are subject to change without notice ...

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