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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R410A
[Model Name]
[Service Ref.]
SUZ-KA25VA5.TH
SUZ-KA25VA5
SUZ-KA25VA5.TH-ET
SUZ-KA35VA5.TH
SUZ-KA35VA5
SUZ-KA35VA5.TH-ET
SUZ-KA50VA5.TH
SUZ-KA50VA5
SUZ-KA50VA5.TH-ET
SUZ-KA60VA5
SUZ-KA71VA5.TH
SUZ-KA71VA5
SUZ-KA71VA5.TH-ET
SUZ-KA25VA5.TH
SUZ-KA35VA5.TH
CONTENTS
2. PARTS NAMES AND FUNCTIONS .................. 3
3. SPECIFICATION ................................................ 4
4. NOISE CRITERIA CURVES .............................. 6
Indication of
5. OUTLINES AND DIMENSIONS ........................ 7
model name
6. WIRING DIAGRAM ............................................ 9
7. REFRIGERANT SYSTEM DIAGRAM ............. 12
8. ACTUATOR CONTROL ................................... 16
9. SERVICE FUNCTIONS ................................... 17
10. TROUBLESHOOTING ..................................... 17
11. DISASSEMBLY PROCEDURE ........................ 34
October 2015
No. OCH603
Note:
• This service manual describes
service data of the outdoor
units only.
PARTS CATALOG (OCB603)
HFC
utilized
R410A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric SUZ-KA25VA5
Summary of Contents for Mitsubishi Electric SUZ-KA25VA5
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS October 2015 No. OCH603 utilized R410A TECHNICAL & SERVICE MANUAL R410A [Model Name] [Service Ref.] Note: • This service manual describes SUZ-KA25VA5.TH SUZ-KA25VA5 service data of the outdoor SUZ-KA25VA5.TH-ET units only. SUZ-KA35VA5.TH SUZ-KA35VA5 SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH SUZ-KA50VA5 SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH... -
Page 2: Combination Of Indoor And Outdoor Units
COMBINATION OF INDOOR AND OUTDOOR UNITS INDOOR UNIT SERVICE MANUAL Outdoor unit Indoor unit Heat pump type SUZ- Service KA25VA5.TH KA35VA5.TH KA50VA5.TH KA60VA5.TH KA71VA5.TH Service Ref. manual No. KA25VA5.TH-ET KA35VA5.TH-ET KA50VA5.TH-ET KA60VA5.TH-ET KA71VA5.TH-ET ─ ─ ─ ─ SLZ-KF25VA.TH ─ ─ ─... -
Page 3: Parts Names And Functions
PARTS NAMES AND FUNCTIONS Air inlet SUZ-KA25VA5 (back and side) SUZ-KA35VA5 Air inlet (back and side) Piping Piping Drain hose Drain hose Air outlet Air outlet Drain outlet Drain outlet SUZ-KA50VA5 Air inlet SUZ-KA60VA5 (back and side) SUZ-KA71VA5 Piping Drain hose... -
Page 4: Specification
SPECIFICATION SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA50VA5.TH SUZ-KA60VA5.TH SUZ-KA71VA5.TH Outdoor model SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET Power supply Single phase 230 V, 50 Hz Model KNB073FKFMC KNB092FFAMC SNB130FGBMT SNB172FEKMT Output 1,200 Cooling 2.76 4.06 5.58 6.62 8.02 Compressor Current* Heating 3.24 4.09 5.75 6.37... - Page 5 Specifications and rating conditions of main electric parts Model SUZ-KA25VA5 SUZ-KA35VA5 SUZ-KA50VA5 SUZ-KA60VA5 SUZ-KA71VA5 Item 620 μF 420 V (C61) — — — — Smoothing 620 μF 420 V 620 μF 420 V 620 μF420 V (C62, C63) — —...
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Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING High High Med. Med. HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET Unit: mm REQUIRED SPACE Basically, leave this space open. Only if front and both sides are open, leave 100 mm at minimum. Drain hole [42 Air in Air in 200 mm or more. - Page 8 SUZ-KA50VA5.TH SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET Unit: mm Basically, leave this space open. REQUIRED SPACE Only if front and both sides are open, leave 500 mm at minimum. 417.5 Air in 100mm or more Air in Air out 2-Oval holes 10 21 500 mm or more.
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Page 9: Wiring Diagram
WIRING DIAGRAM SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET OCH603... - Page 10 SUZ-KA50VA5.TH SUZ-KA50VA5.TH-ET OCH603...
- Page 11 SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET OCH603...
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Page 12: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SUZ-KA25VA5.TH SUZ-KA25VA5.TH-ET Unit: mm Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62 Ambient Compressor temperature... - Page 13 SUZ-KA50VA5.TH SUZ-KA50VA5.TH-ET Unit: mm Refrigerant pipe (with heat insulator) Muffler 4-way valve ø 12.7 (SUZ-KA50VA4) ø 15.88 (SUZ-KA60VA4) Stop valve Strainer (with service port) Outdoor #100 Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat...
- Page 14 SUZ-KA71VA5.TH SUZ-KA71VA5.TH-ET Unit: mm Refrigerant pipe Muffler (with heat insulator) #100 4-way valve ø 15.88 Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat exchanger temperature thermistor RT68...
- Page 15 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid SUZ-KA25VA5 9.52 SUZ-KA35VA5 6.35 SUZ-KA50VA5 12.7 SUZ-KA60VA5 15.88 SUZ-KA71VA5 9.52 MAX. HEIGHT DIFFERENCE Indoor unit * Max. Height difference Max. Length Outdoor unit * Height difference limitations are binding regardless of the height position at which either indoor or outdoor is placed higher.
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Page 16: Actuator Control
ACTUATOR CONTROL SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA50VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. -
Page 17: Service Functions
SERVICE FUNCTIONS SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA50VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to "10-6-1. - Page 18 10-2. TROUBLESHOOTING CHECK TABLE check Abnormal point/ Symptoms Condition Remedy Condition indication code • Overcurrent protection cut-out operates 3 consecutive times Reconnect connector of compressor. Outdoor unit 1-time flash Outdoor power sys- • Refer to 10-5. "How to check in- does not op- within 1 minute after the compressor gets started.
- Page 19 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" As this air conditioner has a function to memorize all the failures that had occured, the latest failure detail can be recalled by following the procedure below. Use this function when the check code is not displayed with wired remote controller or the remote controller at use is wireless type.
- Page 20 10-3-2. Remote controller check <PAR-32MAA> If operations cannot be completed with the remote controller, diagnose the remote controller with this function. Select "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.
- Page 21 10-3-3. Self-diagnosis <PAC-YT52CRA> Retrieve the error history of each unit using the Simple MA controller. Switch to the self-diagnosis mode. button are pressed for 5 seconds or longer, the figure shown below is When the A button and the displayed. Set the address or refrigerant address No.
- Page 22 10-3-4. Remote Controller Check <PAC-YT52CRA> When the air conditioner cannot be controlled from the Simple MA controller, use this function to check the remote controller. 1 First, check the power mark. When normal voltage (12 V DC) is not applied to the remote controller, the power mark goes off. When the power mark is off, check the remote controller wiring and the indoor unit.
- Page 23 10-3-5. Self-diagnosis <Wireless remote controller> <In case of trouble during operation, except for SLZ model> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] •...
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Page 24: Heating
• Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp flash pattern 0.5 s 0.5 s 0.5 s Approx. 2.5 s Approx. -
Page 25: Suz-Ka60Va5.Th
10-4. TROUBLE CRITERION OF MAIN PARTS SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA50VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH-ET SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET Parts name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature Measure the resistance with a tester. thermistor (RT64) Ambient temperature Refer to “10-6. Test point diagram and voltage”, 10-6-1. (KA25/35/50) or thermistor (RT65) 10-6-2. -
Page 26: Troubleshooting Flow
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the intelligent power module (KA25/35/50: IC700, KA60/71: IPM) Check the voltage between terminals. See 10-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. - Page 27 D Check of compressor winding Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
- Page 28 G Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to "10-4. TROUBLE CRITERION OF MAIN PARTS". In case CN721(KA25/35/50)/CN602(KA60/71) is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V.
- Page 29 I Check of LEV Start Turn on power supply to the outdoor unit after checking Normal LEV coil is fixed to the LEV body securely. Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Disconnect the connector CN724 is there nor- Replace the inverter P.C.
- Page 30 Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
- Page 31 Check of outdoor refrigerant circuit The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again.
- Page 32 10-6. TEST POINT DIAGRAM AND VOLTAGE 10-6-1. Inverter P.C. board SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA50VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET SUZ-KA50VA5.TH-ET Smoothing Smoothing R.V.coil Heater connector Smoothing capacitor capacitor (CN721) DB61 (CN722) Back side of unit capacitor (C63) (C62) (C61) 230 V AC 260–370 V DC Fuse (F701) (−)
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Page 33: Suz-Ka60Va5.Th
10-6-2. Inverter P.C. board SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET Fuse (F62) Fuse (F601) R.V. coil (CN602) T2.0AL 250 V T3.15AL 250 V 230 V AC Jumper wire for changing defrost setting (JS) Signal of out- Defrost thermistor door fan motor /RT61 (CN671) (CN931) Discharge temperature thermistor/RT62... -
Page 34: Disassembly Procedure
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector SUZ-KA25VA5.TH SUZ-KA35VA5.TH SUZ-KA25VA5.TH-ET SUZ-KA35VA5.TH-ET NOTE: Turn OFF power supply before disassembling. 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. - Page 35 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following con- Screws of the nectors: relay panel <Inverter P.C.
- Page 36 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to procedure 1.) Outdoor heat (2) Disconnect the following connectors: exchanger tempera- <Inverter P.C. board> ture thermistor CN932 (Fan motor) (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller.
- Page 37 SUZ-KA50VA5.TH SUZ-KA50VA5.TH-ET NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel.
- Page 38 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the terminal (1) Remove the cabinet and panels. (Refer to procedure 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors:...
- Page 39 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
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Page 40: Suz-Ka60Va5.Th
SUZ-KA60VA5.TH SUZ-KA71VA5.TH SUZ-KA60VA5.TH-ET SUZ-KA71VA5.TH-ET NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. - Page 41 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the (1) Remove the cabinet and panels. (Refer to procedure 1.) relay panel (2) Disconnect the lead wire to the reactor and the following con- Screws of the nectors: PB support...
- Page 42 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor thermistor ture thermistor (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 43 OCH603...
- Page 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION New publication, effective Oct. 2015 Distributed in Oct. 2015 No. OCH603 Specifications are subject to change without notice. Made in Japan...