Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R410A
[Model names]
SUZ-KA25VA3
SUZ-KA35VA3
SUZ-KA50VA3
SUZ-KA60VA3
SUZ-KA71VA3
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
[Service Ref.]
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
Indication of
model name
NOTE:
• This service manual describes
technical data of the outdoor
units.
CONTENTS
2. TECHNICAL CHANGES .................................... 3
3. PART NAMES AND FUNCTIONS ...................... 6
4. SPECIFICATION ................................................. 7
5. NOISE CRITERIA CURVES ............................... 9
6. OUTLINES AND DIMENSIONS ........................ 10
7. WIRING DIAGRAM ........................................... 12
8. REFRIGERANT SYSTEM DIAGRAM .............. 15
9. ACTUATOR CONTROL .................................... 18
10. SERVICE FUNCTIONS ..................................... 19
11. TROUBLESHOOTING ...................................... 19
12. DISASSEMBLY INSTRUCTIONS ..................... 49
PARTS CATALOG (OCB530)
October 2012
No.OCH530
HFC
utilized
R410A
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Chapters
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric SUZ-KA25VA3
Summary of Contents for Mitsubishi Electric SUZ-KA25VA3
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Page 1: Table Of Contents
October 2012 No.OCH530 utilized R410A TECHNICAL & SERVICE MANUAL R410A Outdoor unit NOTE: [Model names] [Service Ref.] • This service manual describes technical data of the outdoor SUZ-KA25VA3.TH units. SUZ-KA25VA3 SUZ-KA35VA3.TH SUZ-KA35VA3 SUZ-KA50VA3.TH SUZ-KA50VA3 SUZ-KA60VA3.TH SUZ-KA60VA3 SUZ-KA71VA3.TH SUZ-KA71VA3 CONTENTS 1. COMBINATION OF INDOOR AND OUTDOOR UNITS ..2 2. -
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. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/materials 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 1 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 •...
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Page 6: Part Names And Functions
PART NAMES AND FUNCTIONS SUZ-KA25VA3.TH SUZ-KA35VA3.TH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet SUZ-KA50VA3.TH Air inlet SUZ-KA60VA3.TH (back and side) SUZ-KA71VA3.TH Piping Drain hose Air outlet Drain outlet Model SUZ-KA·VA3.TH Drain socket OCH530... -
Page 7: 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 Model KNB073FKFMC KNB092FFAMC SNB130FGBMT SNB172FEKMT 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 8 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) —...
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Page 9: Noise Criteria Curves
NOISE CRITERIA CURVES SUZ-KA25VA3.TH SUZ-KA35VA3.TH 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 2000 4000... -
Page 10: 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 11: Suz-Ka50Va3.Th
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 12: Wiring Diagram
WIRING DIAGRAM SUZ-KA25VA3.TH SUZ-KA35VA3.TH OCH530... -
Page 13: Suz-Ka50Va3.Th
SUZ-KA50VA3.TH OCH530... - Page 14 SUZ-KA60VA3.TH SUZ-KA71VA3.TH OCH530...
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Page 15: 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 Discharge RT68 heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor... -
Page 16: Suz-Ka50Va3.Th
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 17: Suz-Ka50Va3.Th
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 Models Max. Length A Max. Height difference B Liquid SUZ-KA25VA3.TH 9.52 SUZ-KA35VA3.TH 6.35 SUZ-KA50VA3.TH 12.7 SUZ-KA60VA3.TH 15.88 SUZ-KA71VA3.TH 9.52 MAX. HEIGHT DIFFERENCE Indoor unit * Max. -
Page 18: 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 19: 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 fi nish temperature (°C) Jumper wire SUZ-KA25VA3.TH... -
Page 20: Failure Mode Recall Function
11-2. FAILURE MODE RECALL FUNCTION As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be recalled by following the procedures 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 21 11-2-2. Wired remote controller ■ PAR-30MAA 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.
- Page 22 Self check operation Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Select "Self check" with the F1 or F2 button, and press the button. Check Self check With the F1 or F2 button, enter the refrigerant address, and press the button.
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Page 23: Heating
■ PAR-21MAA CHECK button Turn on the power. Press the [CHECK] button twice. Refrigerant address Set refrigerant address with [TEMP] button TEMP. button if system control is used. IC: Indoor unit °C °C Press the [ON/OFF] button to stop the self-check. SIMPLE OC: Outdoor unit TEMP. -
Page 24: Suz-Ka50Va3.Th
11-2-4. Outdoor unit failure mode table SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH Indoor/outdoor Check code Outdoor unit Abnormal point LED indication unit failure (Wired remote failure mode (Failure mode/protection) (Outdoor P.C. board) mode recall recall function contoller) function None (Normal) — — —... - Page 25 SUZ-KA60VA3.TH SUZ-KA71VA3.TH Indoor/outdoor Check code Outdoor unit Abnormal point LED indication unit failure (Wired remote Condition Remedy failure mode (Failure mode / protection) (Outdoor P.C. board) mode recall controller) recall function function None (Normal) — — — — — — Outdoor power system Overcurrent protection cut-out •...
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Page 26: Suz-Ka50Va3.Th
11-3. TROUBLE SHOOTING CHECK TABLE SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time flash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. - Page 27 SUZ-KA60VA3.TH SUZ-KA71VA3.TH Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
- Page 28 11-4. TROUBLE CRITERION OF MAIN PARTS (1) SUZ-KA25VA3.TH SUZ-KA35VA3.TH Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature Measure the resistance using a tester. thermistor (RT64) Ambient temperature Refer to 11-6. “Test point diagram and voltage”, 11-6-1.
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Page 29: Suz-Ka50Va3.Th
11-4. TROUBLE CRITERION OF MAIN PARTS (2) SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Part name Check method and criterion Figure Defrost thermistor Measure the resistance using a tester. (RT61) Fin temperature Refer to 11-6. “Test point diagram and voltage”, 11-6-4. “Outdoor thermistor (RT64) electronic control P.C. -
Page 30: Troubleshooting Flow
[SUZ-KA25/35/50VA3.TH] 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IC700). Check the voltage between terminals. See 11-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. -
Page 31: Heating
[SUZ-KA25/35/50VA3.TH] 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 32 [SUZ-KA25/35/50VA3.TH] G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter (Refer to 11-6-1.) P.C.
- Page 33 [SUZ-KA25/35/50VA3.TH] I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 11-4.) Disconnect CN932 from outdoor electronic control P.C.
- Page 34 [SUZ-KA25/35/50VA3.TH] K Check of LEV (For wireless remote controller use model) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button.
- Page 35 [SUZ-KA25/35/50VA3.TH] K Check of LEV (For wired remote controller use model) Start Turn on power supply to the outdoor unit after checking Normal LEV coil is fi xed 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 36 [SUZ-KA25/35/50VA3.TH] M How to check miswiring and serial signal error (For wireless remote controller use model) Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between outdoor termi- Check the wiring.
- Page 37 [SUZ-KA25/35/50VA3.TH] M How to check miswiring and serial signal error (For wired remote controller use model) Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between outdoor termi- Check the wiring.
- Page 38 [SUZ-KA25/35/50VA3.TH] 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 39 [SUZ-KA60/71VA3.TH] a How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). See 11-5. b “Check of open phase”. Check the voltage between terminals. Replace the inverter P.C. board. Are the voltages balanced? See 11-5. c “Check of compressor”. Check the compressor.
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Page 40: Heating
[SUZ-KA60/71VA3.TH] 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 41 [SUZ-KA60/71VA3.TH] g Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 11-6-3.) board.
- Page 42 [SUZ-KA60/71VA3.TH] i Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 11-4.) Disconnect CN932 from the inverter P.C.
- Page 43 [SUZ-KA60/71VA3.TH] k Check of LEV (For wireless remote controller use model) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button.
- Page 44 [SUZ-KA60/71VA3.TH] l Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5.i.) Is the fuse (F901) blown on the in- verter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
- Page 45 [SUZ-KA60/71VA3.TH] m How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
- Page 46 [SUZ-KA60/71VA3.TH] n 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.
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Page 47: Suz-Ka50Va3.Th
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) DB61 (CN722) Back side of unit capacitor (C63) (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V... - Page 48 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...
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Page 49: Disassembly Instructions
Pull 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 50 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 51 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.
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Page 52: Och530
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 53: Och530
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 54: Och530
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. -
Page 55: Och530
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 56: Och530
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 57: Och530
OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- perature exchanger tempera- 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 58: Och530
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2012 MITSUBISHI ELECTRIC CORPORATION New publication, effective Oct. 2012 Distributed in Oct. 2012 No.OCH530 Specifications are subject to change without notice. Made in Japan...