Mitsubishi Electric PVA-A24AA7 Service Manual Download Page 47

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OCH721A

Gray

Orange
Red
Yellow
Black

Parts name

Checkpoints

Disconnect the connector then measure the resistance with a tester.

(Ambient temperature 50 to 86°F [10 to 30°C])

Thermistor (TH3)

Thermistor (TH4)

Thermistor (TH6)

<2-phase pipe>
Thermistor (TH7)

<Ambient>
Thermistor (TH8)

<Heat sink>
Thermistor (TH33)

<Comp. surface>

Normal

160 to 410 k

Ω

4.3 to 9.6 k

Ω

39 to 105 k

Ω

TH4

TH33

TH3
TH6
TH7
TH8

Abnormal

Open or short

Measure the resistance between the terminals with a tester.

(Ambient temperature 68°F [20°C])

Solenoid valve coil

<4-way valve>

(21S4)

Motor for compressor

(MC)

Linear expansion valve

(LEV-A/LEV-B/LEV-C)

Normal

Abnormal

Open or short

Disconnect the connector then measure the resistance with a tester.

(Winding temperature 68°F [20°C])

Refer to the next page.

Fan motor(MF1)

1435

150

Ω

0.188

Ω

Measure the resistance between the terminals with a tester.

(Winding temperature 68°F [20°C])

Normal

Abnormal

Open or short

Normal

Gray - Black

Gray - Red

Gray - Yellow

Gray - Orange

Abnormal

Ω

Open or short

10-6. HOW TO CHECK THE PARTS

PUZ-HA24NHA

Summary of Contents for PVA-A24AA7

Page 1: ... EASY MAINTENANCE FUNCTION 70 12 FUNCTION SETTING 72 13 MONITORING THE OPERATION DATABYTHE REMOTE CONTROLLER 77 14 DISASSEMBLY PROCEDURE 87 R410A Notes This manual describes service data of the outdoor units only Model Name PUZ HA24NHA Service Ref PUZ HA24NHA PARTS CATALOG OCB721 SPLIT TYPE HEAT PUMP AIR CONDITIONERS No OCH721 REVISED EDITION A October 2019 Revision Some descriptions have been mod...

Page 2: ... water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigerating cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts When opening or closing the valve below freezing temperatures refrigerant may spurt out from the gap between the valve stem and the...

Page 3: ...e 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 designed for us...

Page 4: ...rectly from cylinder Check that cylinder for R410A on the market is a 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 performanc...

Page 5: ...ve for R410A Gas leak detector Gas leak check Tool for HFC refrigerant Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A Refrigerant cylinder Refrigerant charge Tool exclusive for R410A Applied oil Apply to flared section Ester oil and alkylbenzene oil minimum amount Safety charger Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant To...

Page 6: ...ol the optimal refrigerant level regardless of the length maximum 70 ft 21 m and minimum 16 ft 5 m of piping The additional refrigerant charg ing 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 HA24NHA Outdoor W B temp Heating ...

Page 7: ... Fan motor F L A 0 40 Airflow m3 min 55 CFM 1940 Sound pressure level SPL Cooling dB 52 Heating dB 53 Protection devices HP switch Comp Surface thermistor Dimensions W mm 950 D mm 330 30 H mm 943 W in 37 13 32 D in 13 1 3 16 H in 37 1 8 Weight kg 85 lb 188 Refrigerant R410A Charged kg 3 5 lb 7 11 16 Control Linear expansion valve Oil Charged Model FVC68D L 1 0 oz 33 Refrigerant piping Pipe size O ...

Page 8: ...5 kg 4 7 kg 4 9 kg 5 1 kg 5 3 kg 5 4 kg 3 5 kg 5 2 COMPRESSOR TECHNICAL DATA Winding resistance at 68 F 20 C Service Ref PUZ HA24NHA Compressor model DNB28FBAMT Winding resistance Ω U V 0 74 U W 0 74 W V 0 74 5 DATA 5 3 NOISE CRITERION CURVES PUZ HA24NHA 10 20 30 40 50 60 70 80 90 63 125 250 500 1000 2000 4000 8000 COOLING MODE HEATING 52 SPL dB 53 LINE OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0...

Page 9: ...F 114 98 Suction temperature F 57 40 Ref Pipe length ft 25 25 Discharge pressure Mpa 2 64 2 24 Suction pressure Mpa 1 0 7 Discharge temperature C 63 5 60 5 Condensing temperature C 45 3 36 7 Suction temperature C 14 4 4 Ref Pipe length m 7 6 7 6 Indoor side Intake air temperature D B F 80 70 Intake air temperature W B F 67 60 Discharge air temperature D B F 58 100 Outoor side Intake air temperatur...

Page 10: ...10 OCH721A 6 OUTLINES AND DIMENSIONS PUZ HA24NHA Unit mm inch ...

Page 11: ...11 OCH721A 7 WIRING DIAGRAM PUZ HA24NHA ...

Page 12: ...mum 1500 ft 3 The figures are NOT always against the ground S3 terminal has 24 VDC against S2 terminal However between S3 and S1 these terminals are NOT electrically insulated by the transformer or other device 4 Use earth leakage 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...

Page 13: ... B L1 L2 GR L1 L2 GR 8 3 INDOOR OUTDOOR CONNECTING CABLE Note The Maximum cable length may vary depending on the condition of installation humidity or materials etc Indoor unit Outdoor unit Outdoor power supply Max 147 ft 45 m 3 o AWG15 polar Max 164 ft 50 m 3 o AWG13 polar Max 262 ft 80 m 3 o AWG13 polar and S3 separated Wire No o Size Be sure to connect the indoor outdoor connecting cables direc...

Page 14: ...orm 1 circuit To avoid communication errors caused by noise make sure to observe the single spot grounding method described in the installation manual Centralized controller Refrigerant address 00 M NET address 01 A control remote controller A control remote controller A control remote controller Refrigerant address 00 M NET address 02 Refrigerant address 00 M NET address 03 Power supply unit Cent...

Page 15: ...e of multiple grouping system multiple refrigerant circuits in one group indoor units should be connected by remote controller wiring TB5 and the refrigerant address needs to be set Leave the refrigerant addresses to 00 if the group setting is not conducted Set the refrigerant address by using DIP SW1 3 to 1 6 on the outdoor controller board Initial setting all switches are OFF All refrigerant add...

Page 16: ...and outdoor units start operating refrigerant collecting operation begins LED1 and LED2 on the control board of the outdoor unit are lit Only push the pump down SWP switch if the unit is stopped However even if the unit is stopped and the pump down SWP switch is pushed less than 3 minutes after the compressor stops the refrigerant collecting operation cannot be performed Wait until the compressor ...

Page 17: ...rmality in electrical component controller board remote controller etc Not logged 1Re check the abnormal symptom 2 Conduct troubleshooting and ascertain the cause of the trouble according to 10 5 TROUBLESHOOTING BY INFERIOR PHENOMENA 3 Continue to operate unit for the time being if the cause is not ascertained 4 There is no abnormality concerning of parts such as electrical component controller bo...

Page 18: ...t run F1 F2 F3 F4 MENU ON OFF RETURN SELECT HOLD Cool mode Check the cold air blows out Heat mode Check the heat blows out Press the F1 button to go through the operation modes in the order of Cool and Heat Check the auto vane with the F1 F2 buttons Press the RETURN button to return to Test run operation Press the ON OFF button When the test run is completed the Test run menu screen will appear Th...

Page 19: ...set Reset current error OK Cancel F1 F2 F3 F4 1 Check code error unit refrigerant address unit model name and serial number will appear Date and time of occurrence of the er ror will also appear on PAR 4xMAA The model name and serial number will appear only if the informa tion has been registered Press the F1 or F2 button to go to the next page When an error occurs the following screen will appear...

Page 20: ...Service menu MENU Error history Diagnosis Smooth maintenance Request code F1 F2 F3 F4 Error history Page Delete Check menu RETURN Error Unt dd mm yy Error history Cancel OK Delete error history Error history Check menu RETURN Error history deleted 2 Select Error history with the F1 or F2 button and press the SELECT button Select Check with the F1 or F2 button and press the SELECT button 3 Select E...

Page 21: ...t run mode stop the unit by SW4 1 change the operation mode and restart the test run by SW4 1 ON OFF TEMP FAN VANE MODE CHECK LOUVER TEST RUN AUTO STOP AUTO START h min RESET SET CLOCK TEST RUN COOL 7 5 6 2 3 4 Test run for IR wireless remote controller Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or g...

Page 22: ... F3 F4 Self check Return RETURN Ref address Error history deleted 2 With the F1 or F2 button enter the refrigerant address and press the SELECT button 3 Check code unit number attribute will appear will appear if no error history is available 4 Resetting the error history Press the F4 button Reset on the screen that shows the error history A confirmation screen will appear asking if you want to de...

Page 23: ...ing will appear on the remote controller display if the correct voltage 8 5 12 VDC is not supplied to the remote control ler If this is the case check the remote controller wiring and indoor units OK No problems are found with the remote controller Check other parts for problems E3 6832 There is noise on the transmission line or the indoor unit or another remote controller is faulty Check the tran...

Page 24: ...ts an intermit tent buzzer sound the operation lamp blinks and the check code is output It takes 3 seconds at most for check code to appear 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button The check mode is cancelled Malfunction diagnosis method at maintenance service 10 3 4 Malfunction diagnosis method by IR wireless remote controller In the case of troub...

Page 25: ...ERATION INDICATOR 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 temp...

Page 26: ...nector CNDC 4 Disconnection of reactor DCL 6 Defective outdoor power circuit board 7 Defective outdoor controller circuit board 1 Check following items a Power supply breaker b Connection of power supply terminal block TB1 c Connection of power supply terminal block TB1 2 Check following items a Connection of power supply terminal block TB1 b Connection of terminal on outdoor power circuit board D...

Page 27: ...s 2 Check diameter and length of indoor outdoor unit connecting wire Total wiring length 262 ft 80 m including wiring connecting each indoor unit and between indoor and outdoor unit Also check if the connection order of flat cable is S1 S2 S3 3 Check the 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...

Page 28: ...7 HOW TO CHECK THE COMPONENTS 8 Replace outdoor controller board U2 TH4 1102 TH33 1132 High discharge temperature High comp surface temperature 1 Abnormal if discharge temperature ther mistor TH4 exceeds 248 F 120 or 230 F 110 continuously for 5 minutes Abnormal if condenser evaporator tem perature thermistor TH5 exceeds 104 F 40 during defrosting and discharge temperature thermistor TH4 exceeds 2...

Page 29: ...f abnormalities of TH3 TH6 and TH7 Refer to 10 8 EMERGENCY OPERATION U5 4230 Temperature of heat sink Abnormal if heat sink thermistor TH8 detects temperature indicated below 170 F 77 1 The outdoor fan motor is locked 2 Failure of outdoor fan motor 3 Airflow path is clogged 4 Rise of ambient temperature 5 Defective thermistor 6 Defective input circuit of outdoor power circuit board 7 Failure of ou...

Page 30: ...1 Defective input current detection circuit in outdoor power circuit board 2 Defective outdoor controller circuit board 1 Replace outdoor power circuit board 2 Replace outdoor controller circuit board 08 Abnormal power synchronous signal No input of power synchronous signal to power circuit board Power synchronous signal of 44 Hz or less or 65 Hz or more is detected on power circuit board 1 Distor...

Page 31: ...ed operating time is under 30 minutes and 7 minutes has passed after the compressor operation Thermistors TH3 Liquid pipe temperature TH4 Discharge temperature TH5 Indoor 2 phase pipe temperature TH7 Ambient temperature Thermistor TH3 Outdoor liquid pipe temperature TH4 Discharge temperature TH5 Indoor cond eva temperature TH6 Outdoor 2 phase pipe temperature TH7 Outdoor temperature 1 Stop valve o...

Page 32: ...be abnormal 30 continuous times Check code E3 1 Abnormal if indoor controller board could not find blank of transmission path Check code E5 2 Indoor controller board receives transmitted data at the same time compares the data and when detecting it judges different data to be abnormal 30 continuous times Check code E5 1 2 remote controller are set as main In the case of 2 remote controllers 2 Remo...

Page 33: ...outdoor controller circuit board and the outdoor power circuit board 3 Defective communication circuit of outdoor power circuit board 4 Defective communication circuit of outdoor controller circuit board for outdoor power circuit board 12 Check connection of each connector CN2 and CN4 between the outdoor controller circuit board and the outdoor power circuit board 3 Replace outdoor power circuit b...

Page 34: ...cupation rate on trans mission wire rose because of defective repeater a function to connector or disconnect transmis sion of control and central control system of outdoor unit then abnormality is detected 1 Check if transmission wire of indoor unit FRESH MASTER LOSSNAY or remote con troller is not connected to terminal block for central control TB7 of outdoor unit 2 Check if transmission wire of ...

Page 35: ...rouble is not in 1 5 above in different refrigerant system 2 or more outdoor units judge with 6 6 If address of abnormality source is the address that should not exist there is the unit that memorizes nonexistent address informa tion Delete unused address information with manual setting function of remote controller Only the system FRESH MASTER or LOSSNAY are connected to or the system that is equ...

Page 36: ...indoor unit 5 Defective transmitting receiv ing circuit of indoor unit or LOSSNAY 7 If displayed address or attribute is nonex istent 1 The unit of former address does not exist as address switch has changed while the unit was energized 2 Abnormality is detected when indoor unit transmitted because the address of FRESH MASTER and LOSSNAY are changed after sequential opera tion of FRESH MASTER and ...

Page 37: ...utdoor connecting wire for miswiring Reversed 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 10 10 FUNCTION OF SWITCHES CONNECTORS AND JUMPERS Check protection device connector 63H for contact failure Refer to 10 9 TEST POINT DIAGRAM 3 When pressing the remote controller ope...

Page 38: ...igerant piping 4 Filter clogging 5 Heat exchanger clogging 6 Air duct short cycle 7 Bypass circuit of outdoor unit fault 1 Discharging temperature and indoor heat exchanger temperature does not rise Inspect the failure by checking discharging pressure Replace linear expansion valve 2 If refrigerant leaks discharging temperature rises and LEV opening increases Inspect leakage by checking the temper...

Page 39: ...gnosis after turning on the main power Normal The startup 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 the case of communication errors the display of remote control...

Page 40: ...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 is polariz...

Page 41: ... 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 the 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 indoor...

Page 42: ...contact of the remote controller wire Check the voltage of the terminal block TB5 connecting the remote controller wire If it is not between 10 and 16 VDC 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 43: ...oller twice to clear FILTER from the display See the operation manual that came with the product for how to clean the filters 3 STANDBY is displayed on the screen 3 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 arou...

Page 44: ...controlling the airflow amount in order to keep the optimum operating condition 5 A sound similar to water flowing is heard from the unit 5 This is not a malfunction This is the sound when the refrigerant is flowing inside the indoor unit 2 The fan speed does not match the setting of the remote controller in HEAT operation The up down vane will be automatically set to horizontal blow in these case...

Page 45: ...released 3 The airflow direction does not change Up down vane left right louver 3 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 does not have that function NOT AVAILABLE will be displayed on the remote controller when AIR DIRECTION or LOUVER button is...

Page 46: ...ips down HEAT Water drips down from the heat exchanger Note 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 unit Batteries are being exhausted Replace them and press the reset button of remote controller The display of the IR wireless remote controller gets dim or does not come on The indoor ...

Page 47: ...short Measure the resistance between the terminals with a tester Ambient temperature 68 F 20 C Solenoid valve coil 4 way valve 21S4 Motor for compressor MC Linear expansion valve LEV A LEV B LEV C Normal Abnormal Open or short Disconnect the connector then measure the resistance with a tester Winding temperature 68 F 20 C Refer to the next page Fan motor MF1 1435 i 150 Ω 0 188 Ω Measure the resist...

Page 48: ...oard TEST POINT 1 VDC between 1 and 4 of the fan connector 250 380 VDC TEST POINT 2 VCC between 5 and 4 of the fan connector VCC 15 VDC Did the fuse blow Is there contact failure Is the voltage normal Check the operation Complete Complete Check the operation of fan Disconnect the FAN motor connector and measure the resistance of connector pins Refer to 10 6 HOW TO CHECK THE PARTS Is the fan motor ...

Page 49: ... 40 50 20 10 0 10 20 30 40 50 4 14 32 50 68 86 104122 C F Temperature Resistance kΩ 500 400 300 200 100 0 25 50 75 100 120 77 122 167 212 248 C F Temperature Resistance k Ω 32 F 0 C 180 kΩ 77 F 25 C 50 kΩ 122 F 50 C 17 kΩ 158 F 70 C 8 kΩ 194 F 90 C 4 kΩ Medium temperature thermistor Thermistor Heat sink TH8 200 150 100 50 0 25 50 75 100 110 125 77 122 167 212 230 257 C F Temperature Resistance kΩ ...

Page 50: ...is locked sound can be heard No sound is heard when the pulse number moves from B to A in case coil is burnt 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 ø4 ø4 ø3 ø2 ø1 1 Gray Orange Red Yellow Black 3 4 5 6 Connector LEV A LEV B LEV C 12 VDC Outdoor controller b...

Page 51: ...y 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 may break A How t...

Page 52: ...ation 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 mo...

Page 53: ...72 F 22 C 41 F 5 C 41 F 5 C 45 F 7 C 5 54 F 30 C 9 F 5 C 1 1 1 1 2 Remarks 1 If the thermistor temperature data is normal not open short that data is loaded into the control as valid data If the unit enters emergency operation because TH values have become mismatched setting the thermistors to open short corrects the settings 2 If one thermistor is set to open short the values for each will be dif...

Page 54: ...250 380 VDC 5 4 15 VDC 6 4 0 6 5 VDC 7 4 15 VDC When stopped 7 5 VDC When operated 0 15 V pulse CNS S1 S2 230 VAC CNAC 2 to 4 Power supply for outdoor controller circuit board 230 VAC 1 to 3 Power supply for indoor and outdoor unit connection wire 230 VAC 21S4 4 way valve CN51 Water heater Comp protect CNDM 1 to 2 Input of low level sound priority mode 1 to 3 Input of external contact point SW7 De...

Page 55: ...in the diagram are not actually printed on the board CN6 Thermistor CN4 Connect to the outdoor controller circuit board CN4 NI LI Voltage of 230 VAC is input Connected to the terminal block TB1 EI E2 E3 E4 Connected to the ground CNDC 280 380 VDC 1 3 connect to the outdoor controller circuit board CNDC TB1A TB3A TB1B TB3B Connected to DCL CNAC1 CNAC2 230 VAC Connected to the outdoor controller cir...

Page 56: ...P switch Push switch SW1 1 2 No Function Effective timing Action by the switch operation Manual defrost 1 Start Normal When compressor is working in heating operation 1 Abnormal history clear Refrigerant address setting When power supply ON Clear Normal off or operating SWP 6 5 4 3 Under suspension Pump down Start Normal SW4 SW8 1 2 1 2 3 Test run Operating OFF Under suspension Test run mode setti...

Page 57: ...e next page Special function 4 Please do not use SW7 3 to 7 6 usually Trouble might be caused by the usage condition Type of Switch Switch No Function Action by the switch operation Effective timing ON OFF DIP switch SW5 1 No function 2 Power failure automatic recovery 2 Auto recovery No auto recovery When power supply ON 3 4 5 No function 6 Mode select Following SW5 6 reference SW7 4 1 Mode selec...

Page 58: ...o 0 100 of the normal consumption The demand function will be activated when a commercially available timer or the contact input of an ON OFF switch is added to the CNDM connector option on the control board of the outdoor unit 1 Complete the circuit as shown when using the external input adapter PAC SC36NA E Option 2 By setting SW7 1 on the control board of the outdoor unit the energy consumption...

Page 59: ...ceiving error is detected by indoor unit E6 1 Check if indoor outdoor connecting wire is connected correctly 2 Check if noise entered into indoor outdoor connecting wire or power supply 3 Check if noise entered into indoor outdoor controller board 4 Re check error by turning off power and on again 2 Indoor outdoor unit communication error transmitting error is detected by indoor unit E7 2 Indoor o...

Page 60: ...board are not disconnected 2 Measure resistance value of outdoor thermistors P 29 Open short of outdoor thermistors TH3 TH6 TH7 and TH8 U4 P 29 6 blinking Abnormality of Heat sink temperature U5 1 Check if indoor outdoor units have a short cycle on their air ducts 2 Measure resistance value of outdoor Heat sink thermistor TH8 P 29 7 blinking Abnormality of voltage U9 1 Check looseness disconnectio...

Page 61: ...poned 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 T...

Page 62: ...999 When 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 s 0 5 s 2 s 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 Note Omit the figures after the decimal fractions 0 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed ...

Page 63: ...or history 2 Alternate display of error unit number and code 37 327 3 164 C 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 s 0 5 s 2 s F C 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...

Page 64: ... 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 C When the temperature is 0 F or less and temperature are displayed by turns F C 38 190 39 88 C When...

Page 65: ...t 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 C 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 TH6 38 190 Outdoor heat sink temperature TH8 40 327 62 86 17 30 C F C ...

Page 66: ...ode history 3 of outdoor unit Postponement code display Blinking During postponement Lighting Cancellation of postponement 00 is displayed in the case of no postponement Code display Error 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 ambie...

Page 67: ...ature is 0 F or less and temperature are displayed by turns Example When 15 F 0 5 s 0 5 s 2 s 05 1 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 s 0 5 s 2 s 05 1 Outdoor ambient temperature TH7 on error occurring 38 190 38 190 39 88 C When the temperature is 0 F or less ...

Page 68: ...ccurring SHd 0 327 Cooling TH4 TH6 Heating TH4 TH5 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 F C Minute 1 ON 2 3 4 5 6 U9 Error details To be shown while error call is deferred Pulse LEV B opening pulse 0 480 0 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by turns 1 ON 2 3 4 5 6 Comp surface temperature TH33 4 422 1 ON 2 3 4 5 6 F C 4 422 20 217 C When the comp surfa...

Page 69: ...1 2 1 4 8 2 The tens digit 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 heat sink Example The following controls are activated Primar...

Page 70: ...n Select Check with the F1 or F2 button and press the SELECT button 1 Select Service from the Main menu and press the SELECT button 2 Set each item Select the item to be changed with the F1 or F2 button Select the required setting with the F3 or F4 button Ref address setting 0 15 Stable mode setting Cool Heat Normal Press the SELECT button Fixed operation will start Note Stable mode will take appr...

Page 71: ...r temperature 7 Indoor intake air temperature Cool Classification Item Result Inspection Temperature difference Heat Inspection Temperature difference Stable Unstable F F Stable Unstable F F Notes 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 72: ... controller RF thermostat Function Settings Setting No Initial setting when sent from the factory Remarks 12 1 UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set as necessary 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 unit number to...

Page 73: ...the F3 or F4 button Then press the SELECT button 1 Select Service from the Main menu and press the SELECT button At the main display the menu button and select Service to make the maintenance setting 3 If the password matches the Service menu will appear The type of menu that appears depends on the connected indoor units type A screen will appear that indicates the setting has been saved Navigatin...

Page 74: ... F3 or F4 button Note Checking the indoor unit No When the SELECT button is pressed the target indoor unit will start fan operation If the unit is common or when running all units all indoor units for the selected refrigerant address will start fan operation Function setting Ref address Sending data 5 When the settings are completed press the SELECT button to send the set ting data from the remote...

Page 75: ...nce to set 50 Direct 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 min button Notes 1 If a unit number that cannot be recognized by...

Page 76: ...EL SELECT blinks 2 Press the AUTO START button F blinks 3 Press the button C blinks 4 Press the set button with something sharp at the end MODEL SELECT is lit for 3 seconds then turned off 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 1 4 1 4 2 2 3 3 ...

Page 77: ...ntenance Request code Select Request code with the F1 or F2 button and press the SELECT button Select Check with the F1 or F2 button and press the SELECT button 2 Set the Refrigerant address and Request code Select the item to be changed with the F1 or F2 button Select the required setting with the F3 or F4 button Ref address setting 0 15 Request code setting Press the SELECT button Data will be c...

Page 78: ...rrection Indoor unit Intake air temperature Unit No 2 Heat mode 4 degree correction Indoor unit Intake air temperature Unit No 3 Heat mode 4 degree correction Indoor unit Intake air temperature Unit No 4 Heat mode 4 degree correction Indoor unit Liquid pipe temperature Unit No 1 Indoor unit Liquid pipe temperature Unit No 2 Indoor unit Liquid pipe temperature Unit No 3 Indoor unit Liquid pipe temp...

Page 79: ...t Error postponement history 2 previous Outdoor unit Error postponement history 3 last but one Refer to 13 2 1 DetailContentsinRequestCode Refer to 13 2 1 DetailContentsinRequestCode Refer to 13 2 1 DetailContentsinRequestCode Refer to 13 2 1 DetailContentsinRequestCode 0000 Not connected Examples Ver 5 01 Auxiliary information displayed after version information Examples Ver 5 01 A000 Displays po...

Page 80: ...ompressor 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 temperature at time of error Outdoor unit 2 phase pipe temperature TH6 at time of error Outdoor unit Outside air temperature TH7 at time of error Outdoor unit Heat sink temp...

Page 81: ...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 information sub...

Page 82: ... 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 4 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 operation 2 3 4 Heater is ON 5 Anti freeze protection is ON 6 Overheat prot...

Page 83: ...splay 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 2 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 1 Error content 2 0 0 Error content 1 Detected Display Overvoltage Undervoltage L...

Page 84: ... unit Capacity 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 1 Setting information 2 0 0 Setting information 1 Display Defrost mode 0 Standard 1 For high humidity Setting information 2 Display Single Heat pump three phase cooling only 0 Single phase Heat pump 1 Cooling only ...

Page 85: ...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 display SW1 to SW10 except SW3 Request codes 73 to 82 0 Switch OFF 1 Switch ON Data display SW5 1 2 3 4 0 0 0 0 00 00 1 0 0 0 00 01 0 1 0 0 00 02 1 1 0 0 00 03 0 0 1 0 00 04 1 0 1 0 00 05 0 1 1 0 00 06 1 1 1 0 00 07 0 0 0 1 00 08 1 0 0 1 00 09 0 1 0 1 00 0A 1 1 0 1 00 0b 0 ...

Page 86: ...t 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 disconnected 02 No 2 J42 disconnected 03 No 3 J41 J42disconnected Wireless pair No...

Page 87: ...the top panel See Photo 1 3 Disconnect the indoor outdoor connecting wire from terminal block 4 Disconnect the connector CNF1 LEV A and LEV B on the controller circuit board Symbols on the board CNF1 Fan motor LEV A LEV B LEV 5 Disconnect the pipe side connections of the following parts Thermistor Liquid TH3 Thermistor Discharge TH4 Thermistor 2 phase pipe Ambient TH7 6 High pressure switch 63H 4 ...

Page 88: ...he lead wire in the rear of the electrical parts box See Photo 5 5 Pull out the thermistor Ambient TH7 from the sensor holder Note When replacing thermistor Ambient TH7 replace it together with thermistor 2 phase pipe TH6 since they are combined together Refer to procedure No 4 above to remove thermistor 2 phase pipe Photo 6 6 Removing the thermistor Discharge TH4 and thermistor Comp surface TH33 ...

Page 89: ...cover 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 120 C or more then braze the pipes so that the inside of pipes are not oxidized 9 Removing the LEV 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remov...

Page 90: ...he air Note 2 The welded part can be removed easily by removing the right side panel Note 3 When installing the high pressure switch cover it with a wet cloth to prevent it from heating 100 C or more then braze the pipes so that the inside of pipes are not oxidized Photo 9 11 Removing the reactor DCL 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the electrical ...

Page 91: ...en remove the compressor Note Recover refrigerant without spreading it in the air Photo 11 13 Removing the power receiver 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove 2 front cover panel fixing screws 5 12 and remove the front cover panel See Photo 1 4 Remove 2 back cover panel fixing screws 5 12 and remove the back cover panel 5 Remove the electrical parts bo...

Page 92: ... 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued Oct 2019 No OCH721 REVISED EDITION A Published Sep 2019 No OCH721 Made in Japan Specifications are subject to change without notice ...

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Mitsubishi Electric PVA-A24AA7, Service Manual

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