Mitsubishi Electric Mr.Slim SUZ-KA25VA3 Service Manual

Split-type, heat pump air conditioners

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Technical & service manual (58 pages)

Service manual (46 pages)

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Page 1: Table Of Contents
REVISED EDITION-A utilized R410A TECHNICAL & SERVICE MANUAL R410A Outdoor unit Revision: [Model Name] [Service Ref.] • Errors have been corrected in REVISED EDITION-A. SUZ-KA25VA3.TH • Some descriptions have SUZ-KA25VA3 been modified. SUZ-KA35VA3.TH SUZ-KA35VA3 • Please void OCH530. SUZ-KA50VA3.TH SUZ-KA50VA3 Note: •...
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 Service Ref. KA25VA3.TH KA35VA3.TH KA50VA3.TH KA60VA3.TH KA71VA3.TH Manual No. — — — — SLZ-KA25VA(L).TH — — — — SLZ-KA35VA(L).TH — — —...
Page 3: Technical Changes
TECHNICAL CHANGES INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners. As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/materi- als are required.
Page 4 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) R410A NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm [Gauge]) -0.5 -30 -20 -10 1.
Page 5 2. Refrigerant piping Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall thickness Pipe Insulation material 6.35 For liquid Heat resisting foam plastic 9.52 Specific gravity 0.045 9.52 Thickness 8 mm For gas 12.7 15.88 • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient.
Page 6 6. Pumping Down When relocating or disposing of the air conditioner, pump down the system by following the procedure below so that no refrigerant is released into the atmosphere. 1 Turn off the power supply (circuit breaker). 2 Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3 Fully close the stop valve on the liquid pipe side of the outdoor unit.
Page 7: Parts Names And Functions
PARTS NAMES AND FUNCTIONS Air inlet SUZ-KA25VA3.TH (back and side) SUZ-KA35VA3.TH Air inlet (back and side) Piping Piping Drain hose Drain hose Air outlet Air outlet Drain outlet Drain outlet SUZ-KA50VA3.TH Air inlet SUZ-KA60VA3.TH (back and side) SUZ-KA71VA3.TH Piping Drain hose...
Page 8: Specification
SPECIFICATION Outdoor model SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Power supply Single phase 230V, 50Hz KNB073FKFMC KNB092FFAMC SNB130FGBMT SNB172FEKMT Model Output 1,200 Cooling 2.76 4.06 5.58 6.62 8.02 Current Compressor Heating 3.24 4.09 5.75 6.37 8.13 Refrigeration oil 0.31 (FV50S) 0.27 (FV50S) 0.35 (FV50S)
Page 9 Specifications and rating conditions of main electric parts SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Model SUZ-KA25VA3.TH SUZKA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Item (C61) 620+ 420V — — — — Smoothing (C62, C63) 620+ 420V 620+ 420V 620+ 420V — — capacitor (CB1, 2, 3) 560μF 450V...
Page 10: Noise Criteria Curves
NOISE CRITERIA CURVES SUZ-KA25VA3.TH SUZ-KA35VA3.TH FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) FAN SPEED LINE FAN SPEED 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 2000 4000...
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS SUZ-KA25VA3.TH SUZ-KA35VA3.TH Unit: mm REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. Drain hole [42 Air in Air in Open two sides of left, right, or rear side.
Page 12 SUZ-KA50VA3.TH Unit: mm SUZ-KA60VA3.TH REQUIRED SPACE Open as a rule SUZ-KA71VA3.TH 500mm or more if the front and both sides are open 417.5 Air in 100mm or more 200mm or more if there are obstacles to both sides Air in Air out 2-Oval holes 10 21 Open as a rule...
Page 13: Wiring Diagram
WIRING DIAGRAM SUZ-KA25VA3.TH SUZ-KA35VA3.TH OCH530A...
Page 14 SUZ-KA50VA3.TH OCH530A...
Page 15 SUZ-KA60VA3.TH SUZ-KA71VA3.TH OCH530A...
Page 16: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SUZ-KA25VA3.TH 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 thermistor...
Page 17 SUZ-KA50VA3.TH Unit: mm Muffler Refrigerant pipe ø 12.7 #100 4-way valve (with heat insulator) 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 Flared connection...
Page 18 SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH MAX. REFRIGERANT PIPING LENGTH Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid SUZ-KA25VA3.TH 9.52 SUZ-KA35VA3.TH 6.35 12.7 SUZ-KA50VA3.TH SUZ-KA60VA3.TH 15.88 9.52 SUZ-KA71VA3.TH MAX. HEIGHT DIFFERENCE Indoor unit * Max.
Page 19: Actuator Control
ACTUATOR CONTROL SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH 9-1. 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 20: Service Functions
SERVICE FUNCTIONS SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH 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 11-6-1.) Defrost finish temperature (°C) Jumper wire SUZ-KA25VA3.TH...
Page 21 11-2. TROUBLE SHOOTING CHECK TABLE SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Abnormal point/ check Symptoms Condition Remedy Condition indication code • Outdoor unit 1-time flash Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times Reconnect connector of compres- does not op- within 1 minute after the compressor gets started.
Page 22: How To Proceed "Self-Diagnosis
11-3. 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 23 11-3-2. Remote controller check <PAR-30MAA> <PAR-31MAA> 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 24 11-3-3. Self-diagnosis <PAR-21MAA> When a problem occurs to the air conditioner, the indoor and outdoor units will stop, and the problem is shown in the remote controller display. [CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below.
Page 25: Remote Controller Diagnosis
When the error history is reset, the display will look like the one shown below. Press the button ( in the picture in the previous page) twice ON/OFF However, if you fail to reset the error history, the error content will be displayed again. within 3 seconds.
Page 26 11-3-6. Self-diagnosis <Wireless remote controller> <In case of trouble during operation> 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] 1.
Page 27 • 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 Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
Page 28: Trouble Criterion Of Main Parts
11-4. TROUBLE CRITERION OF MAIN PARTS SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Parts name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature Measure the resistance with a tester. thermistor (RT64) Ambient temperature Refer to 11-6. “Test point diagram and voltage”, 11-6-1. (KA25/35/50) or thermistor (RT65) 11-6-2.
Page 29: Troubleshooting Flow
11-5. 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) See 11-5. “Check of open phase”. Check the voltage between terminals. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor.
Page 30 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 31 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 11-4. 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 32 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 33 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 34 11-6. TEST POINT DIAGRAM AND VOLTAGE 11-6-1. Inverter P.C. board SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH Smoothing Smoothing R.V.coil Heater connector Smoothing capacitor capacitor (CN721) (CN722) DB61 Back side of unit capacitor (C63) (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V...
Page 35 11-6-2. Inverter P.C. board SUZ-KA60VA3.TH SUZ-KA71VA3.TH Fuse (F62) Fuse (F601) R.V. coil (CN602) T2.0AL250V T3.15AL250V 230VAC Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Signal of out- Defrost thermistor door fan motor /RT61 (CN671) (CN931) Discharge temperature thermistor/RT62...
Page 36: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector SUZ-KA25VA3.TH SUZ-KA35VA3.TH OUTDOOR UNIT NOTE: Turn OFF power supply before disassembling. 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel.
Page 37 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 38 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 39 SUZ-KA50VA3.TH 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 40 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 41 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 Outdoor heat Ambient tem- defrost thermistor, outdoor heat exchanger tempera- 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 42 SUZ-KA60VA3.TH SUZ-KA71VA3.TH 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. (4) Remove the service panel.
Page 43 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 44 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 Ambient tem- Outdoor heat defrost thermistor, outdoor heat exchanger tempera- 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.
Page 45 OCH530A...
Page 46 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Sep. 2013 No.OCH530 REVISED EDITION-A New publication, effective Sep. 2013 Distributed in Oct. 2012 No.OCH530 Specifications are subject to change without notice. Made in Japan...

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Mitsubishi Electric Mr.Slim SUZ-KA25VA3 Service Manual

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