Mitsubishi Electric PUZ-A12NKA7 Service Manual

Split-type, heat pump air conditioners split-type, air conditioners

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Outdoor unit

[Model Name]

[Service Ref.]

PUZ-A12NKA7

PUZ-A18NKA7

PUZ-A24NHA7

PUZ-A30NHA7

PUZ-A36NKA7

PUZ-A42NKA7

PUZ-A12NKA7-BS

PUZ-A18NKA7-BS

PUZ-A24NHA7-BS

PUZ-A30NHA7-BS

PUZ-A36NKA7-BS

PUZ-A42NKA7-BS

PUY-A12NKA7

PUY-A18NKA7

PUY-A24NHA7

PUY-A30NHA7

PUY-A36NKA7

PUY-A42NKA7

PUY-A12NKA7-BS

PUY-A18NKA7-BS

PUY-A24NHA7-BS

PUY-A30NHA7-BS

PUY-A36NKA7-BS

PUY-A42NKA7-BS

PUZ-A12/18NKA7

PUY-A12/18NKA7

R410A

CONTENTS

1. REFERENCE MANUAL ································· 2

2. SAFETY PRECAUTION ································· 2

3. FEATURES ····················································· 7

4. SPECIFICATIONS ·········································· 8

5. DATA ····························································· 10

6. OUTLINES AND DIMENSIONS ··················· 14

7. WIRING DIAGRAM ······································ 17

8. WIRING SPECIFICATIONS ·························· 20

9. REFRIGERANT SYSTEM DIAGRAM ············· 21

10. TROUBLESHOOTING ·································· 24

11. EASY MAINTENANCE FUNCTION·············· 84

12. FUNCTION SETTING ··································· 87

13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ·····95

14. DISASSEMBLY PROCEDURE ··················· 104

PARTS CATALOG (OCB636)

February 2017

No. OCH636

REVISED EDITION-A

Revision:

• Corrected the SHF value in

"5-4. STANDARD OPERATION

DATA" in REVISED EDITION-A.

• Some descriptions have been

modified.

• OCH636 is void.

Notes:

• This manual describes service

data of the outdoor units only.

• RoHS compliant products have

<G> mark on the spec name

plate.

Chapters

Table of Contents

Summary of Contents for Mitsubishi Electric PUZ-A12NKA7

Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS February 2017 No. OCH636 SERVICE MANUAL R410A REVISED EDITION-A Outdoor unit [Model Name] [Service Ref.] Revision: PUZ-A12NKA7 PUZ-A12NKA7 • Corrected the SHF value in PUZ-A18NKA7 PUZ-A18NKA7 "5-4. STANDARD OPERATION PUZ-A24NHA7 PUZ-A24NHA7 DATA" in REVISED EDITION-A. PUZ-A30NHA7 PUZ-A30NHA7 • Some descriptions have been PUZ-A36NKA7 PUZ-A36NKA7 modified. PUZ-A42NKA7 PUZ-A42NKA7 • OCH636 is void.
Page 2: Reference Manual
REFERENCE MANUAL INDOOR UNIT Model name Service Ref. Service manual No. OCH640 PLA-A12/18/24/30/36/42EA7 PLA-A12/18/24/30/36/42EA7 OCB640 OCH638 PCA-A24/30/36/42KA7 PCA-A24/30/36/42KA7.TH OCB638 OCH637 PKA-A12/18HA7 PKA-A12/18HA7 OCB637 OCH639 PKA-A24/30/36KA7 PKA-A24/30/36KA7.TH OCB639 PEAD-A12/18/24/30/36/42AA7 PEAD-A12/18/24/30/36/42AA7 ― PVA-A12/18/24/30/36/42AA7 PVA-A12/18/24/30/36/42AA7 ― SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service.
Page 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. In case of using the existing pipes for R22, be careful with Vacuum pump oil may flow back into refrigerant cycle and the following: that can cause deterioration of refrigerant oil, etc.
Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.
Page 5 2-4. CAUTIONS FOR REFRIGERANT PIPING WORK New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different. 1 Thickness of pipes Since the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness shown below. (Never use pipes of 7/256 inch [0.7 mm] or below.) Diagram below: Piping diameter and thickness Thickness : inch [mm] Nominal Outside dimensions (inch) diameter (mm) R410A 6.35 1/32 [0.8] 1/32 [0.8] 9.52 1/32 [0.8] 1/32 [0.8] 12.70 1/32 [0.8] 1/32 [0.8] 15.88...
Page 6 2-5. LOW AMBIENT COOLING Precautions for low ambient cooling • If the outdoor temperature is 23°F or lower during cooling operation, install an optional air guide to prevent wind from blowing into the outdoor unit. • Install the outdoor unit in a location where wind will not blow onto the back of the unit. • To prevent damage to the parts, be sure to install the unit, turn on the main power, and perform service in an environment where the ambient temperature is 0°F or higher. • In order to protect the compressor and electrical components, do not turn off the circuit breaker if the unit is installed in an environment where the ambient temperature is 0°F or lower. • It needs at least 12 hr standby to operation in order to warm the electrical parts. Note: During cooling operation under low ambient temperature, the bottom fan motor of A36, 42N stops occasionally. This is an intended feature, not a malfunction. OCH636A...
Page 7: Features
FEATURES PUZ-A12NKA7 PUZ-A24NHA7 PUZ-A18NKA7 PUZ-A30NHA7 PUZ-A12NKA7-BS PUZ-A24NHA7-BS PUZ-A18NKA7-BS PUZ-A30NHA7-BS PUY-A12NKA7 PUY-A24NHA7 PUY-A18NKA7 PUY-A30NHA7 PUY-A12NKA7-BS PUY-A24NHA7-BS PUY-A18NKA7-BS PUY-A30NHA7-BS PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7 PUY-A42NKA7 PUY-A36NKA7-BS PUY-A42NKA7-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Maximum 100 ft [30 m] (A36, 42)/ Maximum 70 ft [21 m] (A12–30)) The refrigerant circuit with LEV(Linear Expansion Valve) and accumulator always control the optimal refrigerant level regardless of the length (A36, 42: 100 ft [30 m] maximum/ A12–30: 70 ft [21 m] maximum and 16 ft [5 m] minimum) of...
Page 8: Specifications
SPECIFICATIONS PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 Service Ref. PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS Power Phase Single supply Cycle 60 Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Cross fin Defrost method Reverse cycle Crankcase heater ― Compressor Hermetic Model SNB092FNCM SNB130FBCM2 SNB172FWHM1 SNB172FWHM1 MNB33FBRMC-L...
Page 9 PUY-A12NKA7 PUY-A18NKA7 PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 Service Ref. PUY-A12NKA7-BS PUY-A18NKA7-BS PUY-A12NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Power Phase Single supply Cycle 60 Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Cross fin Defrost method Reverse cycle Crankcase heater ― Compressor Hermetic Model SNB092FNCM SNB130FBCM2 SNB172FWHM1 SNB172FWHM1 MNB33FBRMC-L MNB33FBRMC-L Motor output 0.65 R.L.A...
Page 10: Data
75 oz 77 oz ― ― ― ― ― ― ― ― ― ― ― ― ― ― 71 oz PUZ-A12NKA7 PUZ-A12NKA7-BS 2.0 kg 2.0 kg 2.0 kg 2.1 kg 2.1 kg 2.2 kg ― ― ― ― ― ― ― ― ― ― ― ― ― ― 2.0 kg...
Page 11 5-3. NOISE CRITERION CURVES PUZ-A12/18NKA7(-BS) SPL(dB) MODE LINE PUZ-A24/30NHA7(-BS) SPL(dB) MODE LINE COOLING PUY-A12/18NKA7(-BS) COOLING PUY-A24/30NHA7(-BS) HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 HEARING FOR CONTINUOUS NC-20 NOISE CONTINUOUS...
Page 12 208/230 V 208/230 V 208/230 V 208/230 V 208/230 V 208/230 V Current 0.80 A 0.80 A 1.60 A 1.60 A 3.30 A 3.30 A 3.30 A 3.30 A 4.40 A 4.40 A 4.50 A 4.50 A Outdoor unit model PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 Phase Single Single Single Single Single Single Cycle 60 Hz 60 Hz 60 Hz 60 Hz 60 Hz 60 Hz...
Page 13 5-4-2. Cooling only Representative matching PVA-A12AA7 PVA-A18AA7 PVA-A24AA7 PVA-A30AA7 PVA-A36AA7 PVA-A42AA7 Mode COOLING COOLING COOLING COOLING COOLING COOLING Total Capacity BTU/h 12,000 18,000 24,000 30,000 36,000 42,000 Input 890 1,570 1,960 3,000 3,250 4,150 Indoor unit model PVA-A12AA7 PVA-A18AA7 PVA-A24AA7 PVA-A30AA7 PVA-A36AA7 PVA-A42AA7 Phase Single Single...
Page 14: Outlines And Dimensions
OUTLINES AND DIMENSIONS PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS Unit: mm<in> 404.5<15-15/16> drain hole 2-U Shaped notched holes ø 42 Air intake (Foundation Bolt M10<W 3/8>) Installation bolt pitch 500<19-11/16> Air intake Air discharge 40 <1-19/32> 2-10×21 oval hole 23.2<15/16>...
Page 15 PUZ-A24NHA7 PUZ-A30NHA7 PUY-A24NHA7 PUY-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS Unit: mm<in> OCH636A...
Page 16 PUZ-A36NKA7 PUZ-A42NKA7 PUY-A36NKA7 PUY-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Unit: mm<in> 40<1-9/16> OCH636A...
Page 17: Wiring Diagram
WIRING DIAGRAM PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS OCH636A...
Page 18 PUZ-A24NHA7 PUZ-A30NHA7 PUY-A24NHA7 PUY-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS OCH636A...
Page 19 PUZ-A36NKA7 PUZ-A42NKA7 PUY-A36NKA7 PUY-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS OCH636A...
Page 20: Wiring Specifications
WIRING SPECIFICATIONS 8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application) The following connection patterns are available. The outdoor unit power supply patterns vary on models. 1:1 System A Outdoor unit power supply B Wiring circuit breaker or isolating switch C Outdoor unit D Indoor unit/outdoor unit connecting cords E Remote controller...
Page 21: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS Unit: inch [mm] <4-way valve solenoid coil> Heating: ON Cooling: OFF Thermistor TH7 Heat exchanger (Outdoor) 4-way valve Stop valve Thermistor TH6 Charge plug (with service port) (Outdoor 2-phase pipe) Refrigerant GAS pipe [1/2 [12.7 mm] Strainer Thermistor TH3...
Page 22 PUY-A12NKA7 PUY-A18NKA7 PUY-A12NKA7-BS PUY-A18NKA7-BS Unit: inch [mm] Thermistor TH7 Heat exchanger (Outdoor) Stop valve Charge plug Thermistor TH6 (with service port) (Outdoor 2-phase pipe) Refrigerant GAS pipe [1/2 [12.7 mm] Strainer Thermistor TH3 (Outdoor pipe) Muffler Distributor High pressure Thermistor TH32 switch 63H (Suction) Thermistor TH4...
Page 23 1. Refrigerant collecting (pump down) Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit. 1 Supply power (circuit breaker). • When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally. • Startup of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 minutes after the power (circuit breaker) is turned ON. 2 After the liquid stop valve is closed, set SW1-1 on the control board of the outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor and outdoor units) start operating and refrigerant collecting operation begins. LED1 and LED2 on the control board of the outdoor unit are lit. • O nly set SW1-1 to ON if the unit is stopped. However, even if the unit is stopped and SW1-1 is set to ON less than 3 minutes after the compressor stops, the refrigerant collecting operation cannot be performed. Wait until compressor has been stopped for 3 minutes and then set SW1-1 to ON again. 3 Because the unit automatically stops in about 2 to 3 minutes when the refrigerant collecting operation is completed (LED1 off, LED2 lit), be sure to quickly close the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is stopped, refrigerant collection is not properly performed. Open the liquid stop valve completely, and then repeat step 2 after 3 minutes have passed. • I f the refrigerant collecting operation has been completed normally (LED1 off, LED2 lit), the unit will remain stopped until the power supply is turned off. 4 Turn off the power supply (circuit breaker). • Note that when the extension piping is very long with large refrigerant amount, it may not be possible to perform a pump-down operation. Warning: When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc.
Page 24: Troubleshooting
TROUBLESHOOTING 10-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out- door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa- rized in the table below. Check the contents below before investigating details. Unit conditions at service Check code Actions to be taken for service (summary) Judge what is wrong and take a corrective action according Displayed to “10-4.
Page 25 10-2-1. Test run for wired remote controller <PAR-3xMAA ("x" represents 0 or later)> MENU RETURN SELECT ON/OFF Function buttons Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Test run" with the F1 or F2 button, and press the button. Select "Test run" with the F1 or F2 button, and press the button.
Page 26: Error Information
<Error information> When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. C heck code, error unit, refrigerant address, unit model name, and serial Error information number will appear. Error code The model name and serial number will appear only if the information has Error unit Ref.
Page 27 <Checking the error information> Main Main menu While no errors are occurring, page 2/2 of the error information can be viewed by Restriction Energy saving selecting "Error information" from the Main menu. Night setback Errors cannot be reset from this screen. Filter information Error information Main display: Cursor Page <Error history> Test run Input maintenance info. S elect "Service" from the Main menu, and press the button. Function setting Check Self check Select "Check" with the F1 or F2 button, and press the button.
Page 28 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 greater than 1.0 M". TEST COOL 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously. (Start this operation from the turned off status of remote controller display.) and current operation mode are displayed. TEST RUN TEMP ON/OFF MODE 3 Press the ( ) button to activate mode, then COOL check whether cool air blows out from the unit. MODE 4 Press the ( ) button to activate mode, then HEAT check whether warm air blows out from the unit. AUTO STOP 5 Press the button and check whether strong air blows out AUTO START MODE VANE from the unit. VANE 6 Press the button and check whether the auto vane operates CHECK LOUVER properly.
Page 29 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. Self-diagnosis <PAR-3xMAA ("x" represents 0 or later)> Test run Input maintenance info. Function setting Check S elect "Service" from the Main menu, and press the button. Self check Select "Self check" with the F1 or F2 button, and press the button. W ith the F1 or F2 button, enter the refrigerant address, and press the button. Ref. address C heck code, unit number, attribute will appear.
Page 30 10-3-2. Remote controller check <PAR-3xMAA ("x" represents 0 or later)> If operations cannot be completed with the remote controller, diagnose the remote controller with this function. S elect "Service" from the Main menu, and press the button. Maintenance password Remote controller check Select "Remote controller check" with the F1 or F2 button, and press button. S elect "Remote controller check" from the Service menu, and press the but- Remote controller check ton to start the remote controller check and see the check results. Start checking? To cancel the remote controller check and exit the "Remote controller check"...
Page 31 10-4. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Note: Refer to indoor unit section for code P and code E. Check code Abnormal points and detection method Case judgment and action 1 No voltage is supplied to terminal 1 Check following items. block (TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is b) Connection of power supply terminal block turned off. (TB1) b) Contact failure or disconnec- c) Connection of power supply terminal block tion of power supply terminal (TB1) c) Open phase (L1 or L2 phase) 2 Electric power is not charged to 2 Check following items. power supply terminal of out- a) Connection of power supply terminal block door power circuit board.
Page 32 Check code Abnormal points and detection method Case judgment and action 63H connector open 1 Disconnection or contact failure 1 Check connection of 63H connector on outdoor controller circuit board. Abnormal if 63H connector circuit is open for of 63H connector on outdoor 3 minutes continuously after power supply. controller circuit board Refer to "10-9. TEST POINT DIAGRAM". 63H: High-pressure switch 2 Disconnection or contact failure 2 Check the 63H side of connecting wire. of 63H 3 63H is working due to defective 3 Check continuity by tester. (5201) parts. Replace the parts if the parts are defective. 4 Defective outdoor controller 4 Replace outdoor controller circuit board. circuit board Miswiring of indoor/outdoor unit 1 Contact failure or miswiring of 1 Check disconnection or looseness or polarity indoor/outdoor unit connecting wire connecting wire of indoor/outdoor unit connecting wire of...
Page 33: Heating
<Abnormalities detected while unit is operating> Check code Abnormal points and detection method Case judgment and action High pressure (High-pressure switch 1–6 C heck indoor unit and repair the defect. 1 Short cycle of indoor unit 63H operated) 2 Clogged filter of indoor unit Abnormal if High-pressure switch 63H 3 Decreased airflow caused by dirt of indoor fan worked (*) during compressor operation. *602 PSIG [4.15 MPa] 4 Dirt of indoor heat exchanger 5 Locked indoor fan motor 63H: High-pressure switch 6 Malfunction of indoor fan motor 7 Check if stop valve is fully open. 7 Defective operation of stop valve (Not full open) 8 Check piping and repair the defect.
Page 34 Check code Abnormal points and detection method Case judgment and action Open/short circuit of outdoor unit 1 Disconnection or contact failure 1 Check connection of connector (TH4, TH33) temperature thermistor (TH4, TH33) of connectors (TH4, TH33) on on the outdoor controller circuit board. Check breaking of the lead wire for TH4 or TH33. Abnormal if open (−4˚F [−20:] or less) or the outdoor controller circuit Refer to "10-9. TEST POINT DIAGRAM". short (422˚F [217:] or more) is detected board during compressor operation. 2 Check resistance value of TH4, TH33, or 2 Defective thermistor temperature by microprocessor. (Detection is inoperative for 10 minutes 3 Defective outdoor controller cir- (5104) (Thermistor/TH4, TH33: Refer to "10-6. of compressor starting process and for 10 cuit board HOW TO CHECK THE PARTS".) (SW2 on minutes after and during defrosting.) A-Control Service Tool: Refer to "10-10.
Page 35 Check code Abnormal points and detection method Case judgment and action To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, and 2-6. Detailed Refer to "10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". codes Overvoltage error 1 Abnormal increase in power 1 C heck the field facility for the power supply. 2 C orrect the wiring (U . V . W phase) to • Increase in DC bus voltage to: source voltage A12, 18N: 400 V 2 D isconnection of compressor compressor. Refer to "10-9. TEST POINT A24, 30, 36, 42N: 430 V wiring DIAGRAM" (Outdoor power circuit board). 3 D efective outdoor power circuit 3 R eplace outdoor power circuit board.
Page 36: Heating
Check code Abnormal points and detection method Case judgment and action Compressor overcurrent interruption 1 Stop valve is closed. 1 Open stop valve. (When compressor locked) 2 Decrease of power supply voltage 2 Check facility of power supply. Abnormal if overcurrent of DC bus or 3 Correct the wiring (U·V·W phase) to 3 Looseness, disconnection or compressor is detected within 30 seconds converse of compressor wiring compressor. Refer to "10-9. TEST POINT after compressor starts operating. connection DIAGRAM".(Outdoor power circuit board). 4 Defective compressor 4 Check compressor. Refer to "10-6. HOW TO CHECK THE PARTS". 5 Defective outdoor power board (4100) 6 DIP Switch setting for selecting 5 Replace outdoor power circuit board. model is incorrect on the 6 Check that the DIP Switch setting is correct outdoor power circuit board.
Page 37 Check code Abnormal points and detection method Case judgment and action Remote controller transmission error 1 Contact failure at transmission 1 Check disconnection or looseness of indoor (E0)/signal receiving error (E4) wire of remote controller unit or transmission wire of remote controller. 1 Abnormal if main or sub remote controller 2 All remote controllers are set 2 Set one of the remote controllers “main”. If there is no problem with the action above. cannot receive normally any transmission as “sub” remote controller. In from indoor unit of refrigerant address “0” this case, E0 is displayed on 3 Check wiring of remote controller. for 3 minutes. remote controller, and E4 is • Total wiring length: max. 500 m [1640ft] (Check code : E0) displayed at LED (LED1, LED2) (Do not use cable o 3 or more.) on the outdoor controller circuit • The number of connecting indoor units: 2 Abnormal if sub-remote controller could not receive for any signal for 2 minutes.
Page 38 Check code Abnormal points and detection method Case judgment and action Indoor/outdoor unit communication error 1 Contact failure of indoor/out- 1 Check disconnection or looseness of indoor/ (Signal receiving error) door unit connecting wire outdoor unit connecting wire of indoor or out- (Outdoor unit) door units. 2 Defective communication circuit (1) Abnormal if outdoor controller circuit of outdoor controller circuit board 2–4 Turn the power off, and on again to (6840) board could not receive anything nor- check. Replace indoor controller board or 3 Defective communication circuit mally for 3 minutes. of indoor controller board outdoor controller circuit board if abnormal- ity is displayed again. 4 Noise has entered into indoor/ outdoor unit connecting wire. Indoor/outdoor unit communication error 1 Indoor/outdoor unit connecting 1 Check disconnection or looseness of indoor/...
Page 39 Check code Abnormal points and detection method Case judgment and action Abnormal refrigerant circuit 1 When this error occurs, be sure to replace 1 Abnormal operation of 4-way D uring Cooling, Dry, or Auto Cooling valve the 4-way valve. operation, the following conditions are 2 Disconnection of or leakage in 2 Check refrigerant pipes for disconnection or regarded as failures when detected for 1 refrigerant pipes leakage. second. 3 Air into refrigerant piping 3 After the recovery of refrigerant, vacuum dry a) T he compressor continues to run for 30 the whole refrigerant circuit.
Page 40 Check code Abnormal points and detection method Case judgment and action NO ACK signal Common factor that has no rela- Always try the following when the error tion with abnormality source. “A7” occurs. 1. Transmitting side controller detects abnormal if a message was transmitted 1 The unit of former address does not exist as address but there is no reply (ACK) that a mes- 1 Turn off the power supply of outdoor unit switch has changed while the and indoor unit and FRESH MASTER or sage was received. Transmitting side unit was energized. LOSSNAY at the same time for 2 minutes or detects abnormality every 30 seconds, 6 more, and turn the power on again. If mal- 2 Extinction of transmission wire times continuously. voltage and signal is caused by function was accidental, the unit returns to Note: The address and attribute displayed...
Page 41 From the previous page. Check code Abnormal points and detection method Case judgment and action 5. If displayed address or attribute is Same as mentioned in "A7" of the previous 1 During sequential operation of indoor unit and FRESH FRESH MASTER, page. MASTER of other refrigerant Indoor unit detects abnormality when system, if indoor unit transmits indoor unit transmitted to FRESH to FRESH MASTER while out- MASTER and there was no reply (ACK). door unit power supply of same refrigerant system with FRESH MASTER is turned off or within 2 minutes of restart, abnormal- ity is detected. 2 Contact failure of transmission wire of indoor unit or FRESH MASTER 3 Disconnection of transmission connector (CN2M) of indoor unit or FRESH MASTER 4 Defective transmitting receiving...
Page 42 10-5. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure 1. Remote controller display does not 1 12 V DC is not supplied to remote controller. 1Check LED2 on indoor controller board. work. (1) When LED2 is lit. (Power supply display is not indicated on LCD.) Check the remote controller wiring for 2 12–15 V DC is supplied to remote controller, how- breaking or contact failure. ever, no display is indicated. (2) When LED2 is blinking. • “PLEASE WAIT” is not displayed. Check short circuit of remote controller • “PLEASE WAIT” is displayed. wiring. (3) When LED2 is not lit. Refer to phenomena No.3 below. 2 Check the following. • Failure of remote controller if “PLEASE WAIT” is not displayed • Refer to phenomena No.2 below if “PLEASE WAIT” is displayed. 2. “PLEASE WAIT” display is remained 1 At longest 2 minutes after the power supply “PLEASE 1 Normal operation on the remote controller. WAIT” is displayed to start up. 2 Self-diagnosis of remote controller 3 ”...
Page 43 Phenomena Factor Countermeasure 6. Remote controller display works 1 If refrigerant leaks, discharging 1 Refrigerant shortage normally and the unit performs cool- temperature rises and LEV opening ing operation, however, the capacity increases. cannot be fully obtained. (The air Inspect leakage by checking the does not cool well.) temperature and opening. Check pipe connections for gas leakage. 2 Open intake grille and check the filter. 2 Filter clogging Clean the filter by removing dirt or dust on 3 If the filter is clogged, indoor pipe 3 Heat exchanger clogging temperature rises and discharging pressure increases. Check if heat exchanger is clogged by inspecting discharging pressure. Clean the heat exchanger. 4 Remove the blockage. 4 Air duct short cycle 7. Remote controller display works 1 Discharging temperature and indoor heat 1 Linear expansion valve fault normally and the unit performs heat- Opening cannot be adjusted well due to linear exchanger temperature does not rise. ing operation, however, the capacity expansion valve fault. Inspect the failure by checking discharging cannot be fully obtained.
Page 44 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes 2 minutes or more or less How long is “PLEASE WAIT” •...
Page 45 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller. 1 LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit.
Page 46 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller. 2 LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit.
Page 47 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller. 3 LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? •...
Page 48 • Before repair Frequent calling from customers Phone Calls From Customers How to Respond Note Unit does 1 The operating display of remote 1 Check if power is supplied to air conditioner. not operate controller does not come on. Nothing appears on the display unless power is at all.
Page 49 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. 1 Check the set temperature of remote controller. The outdoor unit cannot be operated if the set temperature is not appropriate. The outdoor unit operates in the following modes. COOL: When the set temperature is lower than the room temperature.
Page 50 Phone Calls From Customers How to Respond Note Something 3 Air blows out for a while after However, this control is also 3 This is not a malfunction. is wrong HEAT operation is stopped. The blower is operating just for cooling down the applied to the models which with the heated-up air conditioner.
Page 51 Phone Calls From Customers How to Respond Note A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation gets started in the room of high humidity. Water or moisture is expelled from the outdoor COOL: when pipes or piping joints are cooled, they unit.
Page 52 10-6. HOW TO CHECK THE PARTS PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A12NKA7 PUY-A18NKA7 PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 PUY-A12NKA7-BS PUY-A18NKA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester.
Page 53 10-6-1. Check method of outdoor controller circuit board PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS PNC board check Is the voltage of main incoming Check the breaker and power supply. power 198–253 V AC? Turn off the incoming power supply and...
Page 54 10-6-2. Check method of outdoor controller circuit board PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 PUY-A24NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Outdoor controller circuit board check Fuse check Check the fuse on outdoor controller circuit board. Yes (blow) Did the fuse (F1 and F2) blow? Check the indoor controller board wiring.
Page 55 10-6-3. Check method of power circuit board PUZ-A24NHA7 PUZ-A30NHA7 PUY-A24NHA7 PUY-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS Power board check Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
Page 56: Circuit Diagram
10-6-4. Check method of power circuit board PUZ-A36NKA7 PUZ-A42NKA7 PUY-A36NKA7 PUY-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Power board check Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
Page 57 10-6-5. Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
Page 58 10-7. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction> (TH32) Thermistor R0 = 15 k" ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t – 273 )} t (:): R =15exp{3480( 273+(T– 32)/1.8 – 273 )} T (˚F): R 32˚F [0:] 15 k" 86˚F [30:] 4.3 k" 50˚F [10:] 9.6 k" 104˚F [40:] 3.0 k" 68˚F [20:] 6.3 k" 77˚F [25:] 5.2 k"...
Page 59 Linear expansion valve (A12, 18, 24, 30) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve> Outdoor controller board 12 V DC Drive circuit Blue Orange Yellow White Connector LEV-A LEV-B <Output pulse signal and the valve operation> Output Output (Phase) Opening a valve : 8 → 7 → 6 →5 → 4 → 3 → 2 → 1 → 8 Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1 The output pulse shifts in above order.
Page 60 Linear expansion valve (A36, 42) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve> Outdoor controller board 12 V DC Gray Drive circuit Orange Yellow Black Connector LEV-A LEV-B <Output pulse signal and the valve operation> Output Output (Phase) Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8 Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1 The output pulse shifts in above order.
Page 61 (3) How to attach and detach the coil of linear expansion valve (A12, 18 , 24, 30) <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Coil Lead wire Stopper <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward. Be sure to detach the coil holding main body firmly. Otherwise pipes can bend due to stress. <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-...
Page 62 (4) How to attach and detach the coil of linear expansion valve (A36, 42) <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward. Be sure to detach the coil holding main body firmly. Otherwise pipes can bend due to stress. <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 main body. (At this time, be careful that stress is not added Be sure to attach to lead wire and main body is not wound by lead wire.) If the...
Page 63: Continuous
10-8. EMERGENCY OPERATION (1) When the check codes shown below are displayed on outdoor unit or microprocessor for wired remote controller or indoor unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency opera- tion switch (SWE) to ON and short-circuiting the connector (CN31) on outdoor controller board. When following abnormalities occur, emergency operation will be available. Check code Inspected content Open/short of pipe thermistor (TH3/TH6) Indoor/outdoor unit communication error •Signal receiving error (Outdoor unit) Indoor/outdoor unit communication error •Transmitting error (Indoor unit) E0–7 Communication error other than outdoor unit Communication error between outdoor controller board and M-NET board (Serial communication error)
Page 64: Ground
(5) Operation data during emergency operation During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values: Operation mode Operation data Remarks COOL HEAT Intake temperature (TH1) 81°F [27:] 69°F [20.5:] Indoor fluid pipe temperature (TH2) 41°F [5:] 113°F [45:] Indoor 2-phase pipe temperature (TH5) 41°F [5:] 122°F [50:] Set temperature 77°F [25:] 72°F [22:] Outdoor liquid pipe temperature (TH3) 113°F [45:] 41°F [5:] (*1)
Page 65: Och636A
10-9. TEST POINT DIAGRAM Brief Check of POWER MODULE Outdoor controller circuit board 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 PUZ-A12NKA7 are short-circuited, it means that they are broken. PUZ-A18NKA7 1. Check of Diode (DS1, DS2) PUY-A12NKA7 P - L1, P - N1, N - L1, N - N1 2. Check of Q1 PUY-A18NKA7 P - N PUZ-A12NKA7-BS 3. Check of IPM PUZ-A18NKA7-BS P - N , P - U , P - V , P - W , N - U , N - V , N - W P-N keeps being shirt-circuited until the smoothing condenser is PUY-A12NKA7-BS charged by a tester. PUY-A18NKA7-BS Note: T he marks, P , N , L , L1, N1, U , V and W shown in the Note: PUZ-A12//18NKA checks solder side. diagram are not actually printed on the board. Communication power supply <CAUTION> TEST POINT CNF11 is high voltage. AC in (L, N)
Page 66: Och636A
Switch board PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS CN31 Emergency operation Pump down Demand/silent mode setting Model select A-control Test operation service kit Power failure automatic recovery/ compressor frequency setting manual defrost, delete "error history" CNSW and refrigerant address setting Connect to outdoor con- troller board OCH636A...
Page 67: Och636A
Outdoor controller circuit board PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 PUY-A24NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Demand control setting Manual defrost, detect CNDM Model select history record reset, 1 to 2: Input of low-level refrigerant address CN3S sound priority Water heater CN51 mode Water heater Comp protect 1 to 3: Input of external contact point Test operation 21S4 4-way valve Model select Pump down Solenoid valve...
Page 68: Och636A
Outdoor power circuit board Brief Check of POWER MODULE PUZ-A24NHA7 Usually, they are in a state of being short-circuited if they are broken. PUZ-A30NHA7 Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. PUZ-A24NHA7-BS 1. Check POWER MODULE PUZ-A30NHA7-BS 1 Check of DIODE circuit PUY-A24NHA7 R – P1 S – P1 R – N1 S – N1 PUY-A30NHA7 2 Check of IGBT circuit PUY-A24NHA7-BS P2 – L1 P2 – L2 N2 – L1 N2 – L2 PUY-A30NHA7-BS 3 Check of INVERTER circuit P3 –...
Page 69: Och636A
Outdoor power circuit board Brief Check of POWER MODULE PUZ-A36NKA7 Usually, they are in a state of being short-circuited if they are broken. PUZ-A42NKA7 Measure the resistance in the following points (connectors, etc.). If they are short- PUZ-A36NKA7-BS circuited, it means that they are broken. 1. Check POWER MODULE PUZ-A42NKA7-BS 1 Check of DIODE circuit PUY-A36NKA7 R – P1 S – P1 R – N1 S – N1 PUY-A42NKA7 2 Check of IGBT circuit PUY-A36NKA7-BS P2 – L1 P2 – L2 P2 – L3 N2 – L1 N2 – L2 N2 – L3 PUY-A42NKA7-BS 3 Check of INVERTER circuit P3 –...
Page 70: Och636A
10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches ■ The black square ( ) indicates a switch position. Type Action by the switch operation Function Effective timing Switch switch When compressor is operating Manual defrost *1 Start Normal in heating operation. *1 Abnormal history clear Clear Normal Off or operating...
Page 71: Noise
— — switch No function MODEL SW5-5, 6 * MODEL SW5-5, 6 * PUZ-A12NKA7 PUZ-A30NHA7 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 PUY-A12NKA7 PUY-A30NHA7...
Page 72: Noise
(3) Special function Low-level noise priority mode / Demand control function (Field wiring) The low-level noise priority mode and the demand control function are available by connection of a commercially available timer or ON-OFF contactor to the CNDM connector (an optional demand control input). • In the low-level noise priority mode, the outdoor unit operation noise decreases by approx. 3 to 4 dB compared to usual • The demand control function decreases the power consumption by 0 to 100% compared to usual. Notes: 1. The performance may decrease depending on the outdoor temperature or other conditions. 2. To protect the unit from failure, it may not enter to the low-level noise priority mode during cooling operation and at high ambient temperature. Wiring example 【CNDM】 Adaptor for external input Outdoor controller （PAC-SC36NA） Remote control board Relay circuit circuit board CNDM Orange 1 Relay power Brown 2...
Page 73: Noise
<Display function of inspection for outdoor unit> The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnormality can be indicated in details by connecting an optional part ‘A-Control Service Tool (PAC-SK52ST)’ to connector CNM on outdoor controller board. [Display] (1)Normal condition Outdoor controller board A-Control Service Tool Unit condition LED1 (Green) LED2 (Red) Check code Indication of the display Lighted Lighted Alternately blinking display When the power is turned on Lighted Not lighted 00, etc.
Page 74: Och636A
Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED (Green) LED2 (Red) page 2 blinking 5 blinking Serial communication error P.38 1 Check if connector (CN4) on outdoor controller board and outdoor <Communication between outdoor power board is not disconnected. controller board and outdoor power board> 2 Check if there is poor connection of connector on outdoor <Communication between outdoor controller board(CNMNT and CNVMNT). controller board and M-NET P.C. board> 3 Check M-NET communication signal. P.39–P.41 Communication error of M-NET system A0–A8 3 blinking 1 blinking Abnormality of shell thermistor P.33 1 Check if stop valves are open. (TH32) 2 Check if connectors (TH4, TH33, LEV-A, and LEV-B) on outdoor and discharging temperature (TH4) controller board are not disconnected. 3 Check if unit is filled with specified amount of refrigerant. 4 Measure resistance values among terminals on indoor valve and outdoor linear expansion valve using a tester. 2 blinking Abnormal high pressure (High P.33 1 Check if indoor/outdoor units have a short cycle on their air ducts.
Page 75: Och636A
<Outdoor unit operation monitor function> [When option part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on ‘A-Control Service Tool’. ■ Operation indicator SW2 : Indicator change of self diagnosis The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting 2 3 4 5 6 <Digital indicator LED1 working details> (Be sure that 1 to 6 in the SW2 are set to OFF.) (1) Display when the power supply ON.
Page 76: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) −58 to194 [−50 to 90:] − 58 to 194 (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) ˚F (Example) When −10˚F; 0.5 s 0.5 s 2 s 2 3 4 5 6 Discharge temperature (TH4) −4 to 422 [−20 to 217:] −4 to 422 (When the discharge thermistor detects 100˚F or more, hundreds digit, tens digit and ones digit are ˚F displayed by turns.) (Example) When 105˚F; 2 3 4 5 6 0.5 s 0.5 s 2 s Output step of outdoor FAN 0 to 10 0 to 10 Step 2 3 4 5 6 The number of ON/OFF times of 0 to 9999 compressor...
Page 77: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Operation mode on error occurring Operation mode of when operation stops due to error is displayed by setting SW2 as below. Code (SW2) display 2 3 4 5 6 2 3 4 5 6 Pipe temperature/Liquid (TH3) on −58 to 194 [−50 to 90:] error (When the coil thermistor detects 0˚F or below, “–” occurring and temperature are displayed by turns.) ˚F −58 to 194 (Example) When −15˚F; 0.5 s 0.5 s 2 s 2 3 4 5 6 Discharge temperature (TH4) on −4 to 422 [−20 to 217:] error occurring (When the temperature is 100˚F or more, the...
Page 78: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The number of connected indoor 0 to 3 units (The number of connected indoor units are displayed.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code Capacity Code Capacity Code A12N A30N Code display A18N A36N 2 3 4 5 6 A24N A42N Outdoor unit setting information • The tens digit (Total display for applied setting) Setting details Display details H·P / Cooling only...
Page 79: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Indoor setting temperature 62 to 86 [17 to 30:] 62 to 86 ˚F 2 3 4 5 6 Outdoor pipe temperature/2-phase −58 to 194 [−50 to 90:] pipe (TH6) (When the temperature is 0˚F or less, “–” and ˚F −58 to 194 temperature are displayed by turns.) 2 3 4 5 6 Outdoor outside temperature −58 to 194 [−50 to 90:] (TH7) (When the temperature is 0˚F or less, “–” and ˚F −58 to 194 temperature are displayed by turns.) 2 3 4 5 6 Outdoor heat sink temperature −40 to 327 [−40 to 164:] (TH8)
Page 80: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit DC bus voltage 180 to 500 180 to 500 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.) 2 3 4 5 6 Capacity save 0 to 100 0 to 100 (When the capacity is 100%, hundreds digit, tens When air conditioner is connected digit and ones digit are displayed by turns.) to M-NET and capacity save mode (Example) When 100%; is demanded, a value from “0” to 0.5 s 0.5 s 2 s ”100” is displayed. 2 3 4 5 6 When there is no setting of capacity save, “100” is displayed. Error postponement code history Postponement code display (2) of outdoor unit Blinking: During postponement Lighting: Cancellation of postponement Code “00” is displayed in case of no postponement.
Page 81: Och636A
■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit LEV-A opening pulse on error 0 to 480 occurring (When it is 100 pulse or more, hundreds digit, tens 0 to 480 digit and ones digit are displayed by turns.) (Example) When 130 pulse; Pulse 0.5 s 0.5 s 2 s 2 3 4 5 6 Indoor room temperature (TH1) on 46 to 102 [8 to 39°C] error occurring 46 to 102 ˚F 2 3 4 5 6 Indoor pipe temperature/Liquid −38 to 190 [−39 to 88°C] (TH2) on error occurring (When the temperature is 0˚F or less, “–” and −38 to 190 temperature are displayed by turns.) (Example) When –15˚F; ˚F 0.5 s 0.5 s 2 s 2 3 4 5 6 Indoor pipe temperature/Cond./ −38 to 190 [−39 to 88°C]...
Page 82 SW2 setting Display detail Explanation for display Unit Discharge superheat on error 32 to 360 [0 to 182˚C] occurring (When the temperature is 100˚F or more, hundreds digit, tens digit and ones digit are 32 to 360 displayed by turns.) ˚F (Example) When 150˚F; 2 3 4 5 6 Cooling = TH4−TH6 0.5 s 0.5 s 2 s Heating = TH4−TH5 Sub cool on error occurring. SC 32 to 266 [0 to 130˚C] 32 to 266 (When the temperature is 100˚F or more, hundreds digit, tens digit and ones digit are Cooling = TH6-TH3 displayed by turns.) ˚F Heating = TH5-TH2 (Example) When 115˚F; 2 3 4 5 6 0.5 s 0.5 s 2 s Thermostat-on time until error 0 to 999 stops (When it is 100 minutes or more, hundreds digit, tens 0 to 999 digit and ones digit are displayed by turns.)
Page 83 SW2 setting Display detail Explanation for display Unit Controlling status of compressor The following code will be a help to know the operating frequency operating status of unit. • The tens digit Display Compressor operating frequency control Primary current control Secondary current control • The ones digit (In this digit, the total number of activated control is displayed.) Display Compressor operating frequency control Preventive control for excessive temperature rise of discharge temperature Code...
Page 84: Easy Maintenance Function
EASY MAINTENANCE FUNCTION 11-1. SMOOTH MAINTENANCE 11-1-1. PAR-3xMAA ("x" represents 0 or later) Maintenance data, such as the indoor/outdoor unit’s heat exchanger temperature and compressor operation current can be displayed with “Smooth maintenance”. This cannot be executed during test operation. Depending on the combination with the outdoor unit, this may not be supported by some models. Select "Service" from the Main menu, and press the button. Check menu Error history Refrigerant volume check...
Page 85 11-2.GUIDE FOR OPERATION CONDITION Check Points Inspection item Result Breaker Good Retightened Enter the temperature differences between into Terminal block Outdoor Unit Good Retightened the graph given below. Indoor Unit Good Retightened Operation state is determined according to the plotted areas on (Insulation resistance) M"...
Page 86: Initial Settings For Refrigerant Leakage Detection Function
INITIAL SETTINGS FOR REFRIGERANT LEAKAGE DETECTION FUNCTION 11-3. 11-3-1. PAR-3xMAA ("x" represents 0 or later) Refrigerant leakage is detected after a long time. To enable this function, the refrigerant volume must be saved (initial learning) after installation. Always operate this function in the following manners after installation. • Always perform test run before using this function, and confirm that the air conditioner operates normally. • To accurately detect refrigerant leaks, set the wind speed to strong, and execute this operation. "Refrigerant leak check" is valid only with models which support the refrigerant leak check function. S elect "Service" from the Main menu, and press the button. Check menu Error history Refrigerant volume check Refrigerant leak check...
Page 87: Function Setting
FUNCTION SETTING 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 00 (Select 00 referring to 4 setting the indoor unit number.) <Table 1> Function selections Mode No. : Initial setting Function Settings Setting No. Remarks Wired remote controller (when sent from the factory) (RF thermistor) Power failure Not available automatic recovery Available The setting is Indoor temperature...
Page 88: Service Menu
12-1-1. Selecting functions using the wired remote controller <PAR-3xMAA ("x" represents 0 or later)> <Service menu> Maintenance password is required S elect "Service" from the Main menu, and press the button. Main Main menu Maintenance Initial setting *At the main display, the menu button and select "Service" to make the Service maintenance setting. Main display: Cursor Page W hen the Service menu is selected, a window will appear asking for the pass- Service menu word.
Page 89 <Function setting> S elect "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Function setting" with the F1 or F2 button, and press the button. Function setting S et the indoor unit refrigerant addresses and unit numbers with the F1 Ref. address through F4 buttons, and then press the button to confirm the current Unit No. Grp./1/2/3/4/All setting. Monitor: <Checking the indoor unit No.> Cursor Address When the...
Page 90 12-1-2. Selecting functions using the IR wireless remote controller (Type C) Functions can be selected with the IR wireless remote controller. Function selection using IR wireless remote controller is available only for refrigerant system with wireless function. Refrigerant address cannot be specified by the IR wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below. This example shows how to turn off the function that raises the set temperature by 4 degrees during HEAT operation. The procedure is given after the flow chart.
Page 91: Menu Button
12-2. FUNCTION SELECTION OF REMOTE CONTROLLER 12-2-1. PAR-32MAA The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear. Main display Main menu Main Main menu Vane·Louver·Vent. (Lossnay) High power Room Timer Cool Set temp. Weekly timer OU silent mode Main display: Cursor Page Mode Temp.
Page 92 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the button. SELECT Vane · Louver · Vent. (Lossnay) High power Timer ON/OFF timer Auto-Off timer Weekly timer Restriction Temp. range Operation lock Energy saving Auto return Schedule Night setback Filter information Error information Maintenance Manual vane angle 3D i-see Sensor Initial setting Main/sub Clock...
Page 93 Main menu list Setting and display items Setting details Vane · Louver · Vent. (Lossnay) Use to set the vane angle. • Select a desired vane setting from five different settings. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation. • Select a desired setting from "Off," "Low," and "High." High power Use to reach the comfortable room temperature quickly. • Units can be operated in the High-power mode for up to 30 minutes.
Page 94 12-3. Function selection of IR wireless remote controller TEMPERATURE DISPLAY °C/°F SETTING (Change of temp mode from °F to °C) 1 Press the set button with something sharp at the end. MODEL SELECT blinks. AUTO START 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. TEST CHECK COOL °F MODEL °C SELECT STOP AMPM AUTO SWING START AMPM HEAT NOT AVAILABLE ON/OFF TEMP...
Page 95: Monitoring The Operation Data By The Remote Controller
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" 13-1-1. PAR-3xMAA ("x" represents 0 or later) Details on the operation data including each thermistor temperature and error history can be confirmed with the remote controller. S elect "Service" from the Main menu, and press the button. Check menu Error history Refrigerant volume check Refrigerant leak check Smooth maintenance Select "Check" with the F1 or F2 button, and press the button.
Page 96 13-2. REQUEST CODE LIST Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Description Request content Unit Remarks (Display range) Operation state Refer to 13-2-1. Detail Contents in Request Code. – Compressor-Operating current (rms) 0–50 Compressor-Accumulated operating time 0–9999...
Page 97 Description Request content Unit Remarks (Display range) Indoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Outdoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 13-2-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 13-2-1.Detail Contents in Request Code.
Page 98 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" - - " is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" - - " is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
Page 99 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0–9999 1 hour (After filter is reset) Indoor-Total operating time 0–9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) 0–255 Fan control data – For indoor fan phase control Indoor fan output value "...
Page 100 13-2-1. Detail Contents in Request Code Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" A: Mode display B: Refrigerant address C: Data display area D: Request code display area [Operation state] (Request code : "0") <Refer to P75.> Relay output state Power currently Data display...
Page 101 [Fan control state] (Request code : "53") <Refer to P80.> Data display Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display Correction value - (minus) – 1 [Actuator output state] (Request code : "54") <Refer to P75.>...
Page 102 [Contact demand capacity] (Request code : "61") <Refer to P72.> Setting content Data display Setting Display Setting value Setting content SW7-1 SW7-2 100% [External input state] (Request code : "62") <Refer to P72.> Input state : Input present Data display Contact demand Silent mode Spare 1...
Page 103 [Indoor unit – Capacity setting information] (Request code : 163) Data display Display Capacity setting state Display Capacity setting state See the table on the right. [Wireless pair No. (indoor control board side) setting] (Request code : 165) Data display Display Pair No.
Page 104: Disassembly Procedure
DISASSEMBLY PROCEDURE PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS PHOTO: PUZ-A12NKA7 OPERATING PROCEDURE PHOTOS Top panel fixing screws 1. Removing the top panel, service panel, front panel, Photo 1 Top panel Top panel back panel, and grille fixing screw (1) R emove the top panel fixing screws (4 × 10), one from the right and two from the left side, and detach the top panel. Grille (2) R emove 2 service panel fixing screws (4 × 10) and...
Page 105 OPERATING PROCEDURE PHOTOS 3. Removing the electrical parts box Photo 5 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) Controller circuit Electrical parts box (3) Remove the front panel. (See Photo 1) Electrical part box board (C.B) fixing screw (4) Remove the back panel. (See Photo 1) (5) D isconnect the indoor/outdoor connecting wire from terminal block. (6) D isconnect 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 (7) Disconnect the pipe-side connections of the following parts. • 4-way valve (21S4) • Thermistor <Liquid> (TH3) • Thermistor <Comp. surface> (TH33) • Thermistor <Discharge> (TH4) • Thermistor <2-phase pipe, Ambient> (TH6/7) • Thermistor <Suction> (TH32) • High pressure switch (63H) Terminal block (8) R emove the terminal cover and disconnect the Compressor (MC)
Page 106 OPERATING PROCEDURE PHOTOS 5. Removing the thermistor <Ambient> (TH7) Photo 7 Thermistor <Outdoor> (1) Remove the service panel. (See Photo 2) Electrical parts box (TH7) (2) Remove the top panel. (See Photo 1) (3) D isconnect the connector TH7 (red) on the controller circuit board in the electrical parts box. (4) L oosen the clamp for the lead wire in the rear of the electrical parts box. (See Photo 6) (5) P ull 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.
Page 107 OPERATING PROCEDURE PHOTOS Photo 10-1: PUZ model 8. Removing the 4-way valve 4-way valve (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) LEV coil (LEV A) (5) Remove the electrical parts box. (See Photo 5) (6) Remove the 4-way valve (See Photo 9) LEV coil (7) Recover refrigerant. (LEV B) (8) Remove the welded part of 4-way valve. Note 1: Recover refrigerant without spreading it in the LEV B air. LEV A Note 2: The welded part can be removed easily by removing the back panel.
Page 108 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) Photo 12 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) Compressor (4) Remove the back panel. (See Photo 1) shell felt (5) Remove the electrical parts box. (See Photo 5) (6) Remove the thermistor <Discharge> (TH4) and ther- mistor <Comp. surface> (TH32). (See Photo 8) (7) R emove 3 separator fixing screws (4 × 10) and remove Compressor Rubber the separator. (MC) mount (8) R emove the compressor body felt and compressor shell felt. (9) Cutting the band and remove the rubber mount. (10) Recover refrigerant. Band Compressor (11) R emove 3 compressor fixing nuts by using a spanner body felt or a adjustable wrench. (12) Remove the welded pipe of compressor inlet and outlet.
Page 109 PUZ-A24NHA7 PUZ-A30NHA7 PUY-A24NHA7 PUY-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the service panel and top panel Top panel fixing screws (1) R emove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Top panel panel. (2) R emove screws (3 for front, 3 for rear/5 × 12) of the top panel and remove it. Slide Side panel (R) Service panel Fan grille Cover panel (Rear) Grille fixing Cover panel Service panel screws (Front)
Page 110 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor <Liquid> (TH3) and thermistor Photo 5 Thermistor <2-phase pipe> (TH6) Electrical parts box <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Thermistor Controller <Ambient> (3) Disconnect the connector TH7/6 (red) and TH3 (white) (TH7) circuit board on the controller circuit board in the electrical parts box. (C.B.) (4) Loosen the 2 clamps for the lead wires on the top of the electrical parts box. (5) Pull out the thermistor <2-phase pipe> (TH6) and the thermistor <Liquid> (TH3) from each sensor holders. Note: When replacing thermistor <2-phase pipe> (TH6), replace it together with thermistor <Ambient>...
Page 111 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 8. Removing the 4-way valve coil (21S4), LEV coil (LEV(A), Photo 8 4-way valve coil LEV(B)) 4-way valve fixing screw (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) [Removing the 4-way valve coil] (4) Remove 4-way valve coil fixing screw (M4 × 6). (5) Remove the 4-way valve coil by sliding the coil toward you. (6) Disconnect the connector 21S4 (green) on the controller board in the electrical parts box. [Removing the LEV coil] (4) Remove the LEV coil by sliding the coil upward. (5) Disconnect the connectors, LEV A (white) and LEV B (red), on the controller circuit board in the electrical parts box.
Page 112 OPERATING PROCEDURE PHOTOS 11. Removing the high pressure switch (63H) Photo 9 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) R emove 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. Lead wire of (6) Recover refrigerant. high pressure switch (7) Remove the welded part of high pressure switch. 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.
Page 113 OPERATING PROCEDURE PHOTOS 13. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) R emove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 1) (4) R emove 2 back cover panel fixing screws (5 × 12) and remove the back cover panel. Valve bed (5) Remove the electrical parts box. (See Photo 4) (6) R emove 3 valve bed fixing screws (4 × 10) and 4 ball valve and stop valve fixing screws (5 × 16) and then Valve bed fixing screws remove the valve bed. (7) R emove 3 right side panel fixing screws (5 × 12) in the rear of the unit then remove the right side panel. Power (8) R emove 2 separator fixing screws (4 × 10) and remove Valve bed receiver the separator. fixing screw (9) Recover refrigerant.
Page 114 PUZ-A36NKA7 PUZ-A42NKA7 PUY-A36NKA7 PUY-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS PHOTO: PUZ-A36NKA7 OPERATING PROCEDURE PHOTOS 1. Removing the service panel, top panel, ice guard, and Photo 1 Top panel fixing screws Top panel propeller (1) R emove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel. (See Photo 1) Grille fixing (2) R emove screws (3 for front, 3 for rear/5 × 12) of the top Slide screws panel and remove it. (See Photo 1) (3) R emove 4 grille fixing screws (5 × 12) from each grille and remove it. (See Photo 1) (4) P ull down the ice guard and remove it. (See Photo 2)
Page 115 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor <2-phase pipe> (TH6) Photo 5 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) D isconnect the connectors, TH6 and TH7 (red), on the Clamp Electrical controller circuit board in the electrical parts box. parts box (4) L oosen the clamp for the lead wire in the rear of the electrical parts box. (5) P ull out the thermistor <2-phase pipe> (TH6) from the sensor holder. Note: In case of replacing thermistor <2-phase pipe> (TH6), replace it together with thermistor <Ambient>...
Page 116 OPERATING PROCEDURE PHOTOS 7. Removing the 4-way valve coil (21S4) and linear expan- Photo 8-1: PUZ model sion valve coil (LEV-A, B) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] 4-way valve (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. Linear expansion [Removing the linear expansion valve coil] valve coil (LEV-A) (3) R emove the linear expansion valve coil by sliding the coil upward.
Page 117 OPERATING PROCEDURE PHOTOS Photo 9-1: PUZ model 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 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. (5) Recover refrigerant. (6) Remove the welded part of high pressure switch. Note 1: Recover refrigerant without spreading it in the air. High pressure Note 2: The welded part can be removed easily by switch (63H) removing the right side panel.
Page 118 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 1 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 3) (4) Remove 4 back cover panel fixing screws (5 × 12) and remove the back cover panel. (5) Remove the electrical parts box. (See Photo 4) Valve bed Inlet (6) Remove 3 valve bed fixing screws (2 × 12), 4 ball valve Outlet and stop valve fixing screws (5 × 16), then remove the valve bed. (7) Remove 4 right side panel fixing screws (5 × 12) in the rear of the unit and then remove the right side panel. (8) Remove 3 separator fixing screws (4 × 10) and remove the separator. Separator Valve bed (9) Recover refrigerant. fixing screws (10) Remove the 3 points of the compressor fixing nut using spanner or adjustable wrench. (11) Remove the welded pipe of the compressor inlet and Accumulator outlet and then remove the compressor. Compressor Note: Recover refrigerant without spreading it in the (MC) air.
Page 119 OCH636A...
Page 120 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2016 MITSUBISHI ELECTRIC CORPORATION Issued: Feb. 2017 No. OCH636 REVISED EDITION-A Published: Oct. 2016 No. OCH636 Made in Japan Specifications are subject to change without notice.

Mitsubishi Electric PUZ-A12NKA7 Service Manual

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