Mitsubishi Electric SUZ-KA25VA Technical & Service Manual
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Mitsubishi Electric SUZ-KA25VA Technical & Service Manual

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See also: Service Manual , Technical Data Book
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R410A
[model names]
SUZ-KA25VA
SUZ-KA35VA
SUZ-KA25VAH
SUZ-KA35VAH
SUZ-KA50VA
SUZ-KA60VA
SUZ-KA71VA
NOTE:
This service manual describes technical data of the
outdoor units.
•As for indoor units SLZ-KA25/35/50VA(L).TH and SEZ-
KA35/50/60/71VA.TH, refer to the service manual
OC320 and OC321.
SUZ-KA25VAH.TH
SUZ-KA50VA
1
SUZ-KA60VA
1
SUZ-KA71VA
1
Indication of
model name
.TH
.TH
.TH
CONTENTS
2. TECHNICAL CHANGES ···································2
3. PART NAMES AND FUNCTIONS······················6
4. SPECIFICATION·················································7
5. NOISE CRITERIA CURVES ·····························11
6. OUTLINES AND DIMENSIONS ·······················12
7. WIRING DIAGRAM ··········································14
8. REFRIGERANT SYSTEM DIAGRAM ··············18
9. PERFORMANCE CURVES ······························22
10. ACTUATOR CONTROL····································50
11. SERVICE FUNCTIONS·····································51
12. TROUBLESHOOTING······································51
13. DISASSEMBLY INSTRUCTIONS·····················84
14. PARTS LIST······················································91
15. RoHS PARTS LIST···········································97
March 2007
No.OC322
REVISED EDITION-C
HFC
utilized
R410A
Revision:
• SUZ-KA50/60/71VA
.TH
1
are added in REVISED
EDITION-C.
• Some descriptions have
been modified.
• Please void OC322
REVISED EDITION-B.
Note:
• RoHS compliant products
have <G> mark on the
spec name plate.
• For servicing of RoHS
compliant products, refer
to the RoHS Parts List.

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  • Page 1: Table Of Contents

    6. OUTLINES AND DIMENSIONS ·······················12 7. WIRING DIAGRAM ··········································14 8. REFRIGERANT SYSTEM DIAGRAM ··············18 9. PERFORMANCE CURVES ······························22 10. ACTUATOR CONTROL····································50 11. SERVICE FUNCTIONS·····································51 SUZ-KA25VA(H).TH SUZ-KA35VA(H).TH 12. TROUBLESHOOTING······································51 13. DISASSEMBLY INSTRUCTIONS·····················84 14. PARTS LIST······················································91 15. RoHS PARTS LIST···········································97 NOTE: This service manual describes technical data of the outdoor units.

  • Page 2: Service Ref

    2.Max. height difference 15m 30m (Except when combined with MFZ). 3.Garanteed operating range Lower limit (Cooling/Outdoor) -10:DB -15:DB (Except when combined with MFZ) SUZ-KA25VA.TH SUZ-KA35VA.TH Lower limit (Heating/Outdoor) -10:DB -15:DB. SUZ-KA35VAH.TH Defrost finish temperature has been changed (Refer to 11).
  • Page 3 5.Power P.C.board has been changed. 6.Inverter P.C. board has been changed. 7.Refrigerant circuit has been changed. • Compressor has been changed.(KNB073FBVH KNB073FDVH:SUZ-KA25VA) (KNB092FAAH KNB092FCAH:SUZ-KA35VA) • Specification and position of muffler have been changed. • Path of outdoor heat exchanger has been changed.
  • Page 4 New Specification Current Specification The incompatible refrigerant oil easily separates from Since refrigerant and refrigerant oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigerant oil backs to the compressor through the lower Raising position of the oil back hole enables to back the position oil back hole.
  • 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 Thickness 9.52 8 mm For gas 12.7 15.88 •...

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS SUZ-KA25VA.TH ACCESSORIES SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH OUTDOOR UNIT Air inlet (back and side) Piping SUZ-KA25VA.TH SUZ-KA35VA.TH Drain hose Drain socket Air outlet Drain outlet SUZ-KA50VA.TH SUZ-KA50VA ACCESSORIES SUZ-KA60VA.TH SUZ-KA60VA SUZ-KA71VA.TH SUZ-KA71VA OUTDOOR UNIT Air inlet (back and side)

  • Page 7: Specification

    SPECIFICATION SLZ-KA·VA(L).TH / SUZ-KA·VA(H).TH SUZ-KA50VA.TH SUZ-KA35VA(H).TH SUZ-KA25VA(H).TH SUZ-KA50VA Outdoor Service Ref. Indoor Service Ref. Indoor Service Ref. Indoor Service Ref. SLZ-KA25VA(L).TH SLZ-KA35VA(L).TH SLZ-KA50VA(L).TH Cooling Heating Cooling Cooling Function Heating Heating Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz 3.5(1.0-3.9)
  • Page 8 SEZ-KC·VA.W, SEZ-KA·VA.TH / SUZ-KA·VA(H).TH SUZ-KA25VA(H).TH SUZ-KA35VA(H).TH Indoor Service Ref. Indoor Service Ref. Outdoor Service Ref. SEZ-KC25VA.W SEZ-KA35VA.TH Cooling Function Heating Cooling Heating Single phase Single phase Power supply 230V,50Hz 230V,50Hz 2.5(0.9-3.2) 3.5(1.0-3.9) 4.0(0.9-5.0) Capacity Rated frequency(Min.-Max.) 3.0(0.9-4.5) Dehumidification — —...
  • Page 9 SEZ-KA·VA.TH / SUZ-KA·VA.TH SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA SUZ-KA60VA SUZ-KA71VA Outdoor Service Ref. Indoor Service Ref. Indoor Service Ref. Indoor Service Ref. SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Cooling Cooling Cooling Heating Heating Heating Function Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz 5.0(1.1-5.6)
  • Page 10 Specifications and rating conditions of main electric parts SUZ-KA25VA.TH SUZ-KA25VAH.TH SUZ-KA35VA.TH SUZ-KA35VAH.TH Model SUZ-KA25VA.TH SUZ-KA25VAH.TH SUZ-KA35VA.TH SUZ-KA35VAH.TH Item (CT) Current transformer ETA19Z59BZ (CT761, CT781) Current transformer ETQ19Z71AY (C63A, C63B, C63C) Smoothing capacitor 620+ 420V (DB61, DB65) Diode module D25XB60 (F61)

  • Page 11: Noise Criteria Curves

    NOISE CRITERIA CURVES SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING High High Med. Med. HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SUZ-KA25VA.TH SUZ-KA25VAH.TH Unit: mm SUZ-KA35VA.TH SUZ-KA35VAH.TH OUTDOOR UNIT REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. Drain hole [42 (SUZ-KA25/KA35VA) Drain hole [33 (SUZ-KA25/KA35VAH) Air in...

  • Page 13: Outdoor Unit

    SUZ-KA50VA.TH SUZ-KA50VA Unit: mm SUZ-KA60VA.TH SUZ-KA60VA SUZ-KA71VA.TH SUZ-KA71VA OUTDOOR UNIT REQUIRED SPACE Open as a rule 500mm or more if the front and both sides are open 100mm or more 200mm or more if 100mm or more there are obstacles to both sides Open as a rule 500mm or more if the back,...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM SUZ-KA25VA.TH MODELS WIRING DIAGRAM SUZ-KA35VA.TH OUTDOOR UNIT...
  • Page 15 SUZ-KA25VAH.TH MODELS WIRING DIAGRAM SUZ-KA35VAH.TH OUTDOOR UNIT...
  • Page 16 SUZ-KA50VA.TH SUZ-KA50VA SUZ-KA60VA.TH SUZ-KA60VA MODELS WIRING DIAGRAM OUTDOOR UNIT...
  • Page 17 SUZ-KA71VA.TH SUZ-KA71VA MODEL WIRING DIAGRAM OUTDOOR UNIT...

  • Page 18: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SUZ-KA25VA.TH Unit:mm SUZ-KA25VAH.TH OUTDOOR UNIT Refrigerant pipe [9.52 4-way valve (with heat insulator) Muffler Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor Defrost RT65 thermistor RT61...
  • Page 19 SUZ-KA50VA.TH SUZ-KA50VA Unit:mm SUZ-KA60VA.TH SUZ-KA60VA OUTDOOR UNIT Refrigerant pipe [12.7 (SUZ-KA50VA) Muffler #100 (with heat insulator) [15.88 (SUZ-KA60VA) 4-way valve Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat...
  • Page 20 SUZ-KA25VA.TH SUZ-KA25VAH.TH SUZ-KA35VA.TH SUZ-KA35VAH.TH MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Models Max. length : m Liquid SUZ-KA25VA.TH SUZ-KA35VA.TH 6.35 9.52 SUZ-KA25VAH.TH SUZ-KA35VAH.TH MAX. HEIGHT DIFFERENCE Indoor (SLZ/SEZ) unit w Max. Height difference 12m Refrigerant Piping Max.
  • Page 21 SUZ-KA50VA.TH SUZ-KA50VA SUZ-KA60VA.TH SUZ-KA60VA SUZ-KA71VA.TH SUZ-KA71VA MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Model Max. length : m Liquid SUZ-KA50VA.TH 12.7 SUZ-KA50VA 6.35 SUZ-KA60VA.TH SUZ-KA60VA 15.88 SUZ-KA71VA.TH 9.52 SUZ-KA71VA MAX. HEIGHT DIFFERENCE Indoor (SLZ/SEZ) unit w Max. Height difference 30m Refrigerant Piping Max.

  • Page 22: Performance Curves

    PERFORMANCE CURVES SLZ-KA25VA(L).TH / SUZ-KA25VA.TH, SUZ-KA25VAH.TH SLZ-KA35VA(L).TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH SLZ-KA50VA(L).TH / SUZ-KA50VA.TH, SUZ-KA50VA The standard data contained in these specifications applies only to the operation of the air conditioner under normal condition. Operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 23 Indoor intake air Wet-bulb temperature(:) Indoor intake air Wet-bulb temperature(:) 45 46 45 46 Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) Indoor intake air Wet-bulb Indoor intake air Wet-bulb temperature(:) temperature(:) 45 46 45 46 Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 10.8...
  • Page 24 15.2 11.0 13.0 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH Correction of Heating total input Correction of Cooling total input...

  • Page 25: Heat Operation

    OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor unit are under the Dry-bulb temperature Relative humidity(%) same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 58Hz(SUZ-KA25VA(H).TH) 73Hz(SUZ-KA35VA(H).TH) 75Hz(SUZ-KA50VA .TH) SUZ-KA35VA(H).TH SUZ-KA50VA SUZ-KA25VA(H).TH...

  • Page 26: Indoor Unit

    SEZ-KC25VA.W / SUZ-KA25VA.TH, SUZ-KA25VAH.TH SEZ-KA35VA.TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH SEZ-KA50VA.TH / SUZ-KA50VA.TH, SUZ-KA50VA SEZ-KA60VA.TH / SUZ-KA60VA.TH, SUZ-KA60VA SEZ-KA71VA.TH / SUZ-KA71VA.TH, SUZ-KA71VA The standard data contained in these specifications applies only to the operation of the air conditioner under normal condition. Operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 27 Indoor intake air Wet-bulb temperature(:) Indoor intake air Wet-bulb temperature(:) 45 46 45 46 Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) Indoor intake air Wet-bulb temperature(:) Indoor intake air Wet-bulb temperature(:) 45 46 45 46 Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 10.5...
  • Page 28 Heating capacity Total input (heating) 25.2 22.7 24.5 25.3 23.2 20.9 22.6 23.3 21.3 19.2 20.7 21.4 19.4 17.4 18.9 19.4 17.4 15.7 17.0 17.5 15.5 14.0 15.1 15.5 13.6 12.2 13.2 13.6 11.6 10.5 11.3 11.7 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) Heating capacity Total input (heating)
  • Page 29 SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor SUZ-KA35VA(H).TH...
  • Page 30 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor unit are under the Dry-bulb temperature Relative humidity(%) same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 63Hz(SUZ-KA25VA(H).TH) 73Hz(SUZ-KA35VA(H).TH) 80Hz(SUZ-KA50VA .TH) 87Hz(SUZ-KA60VA .TH) 61Hz(SUZ-KA71VA .TH)
  • Page 31 HEAT operation Condition indoor: Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Condition outdoor: Dry bulb temperature 2,7,15,20.0°C Wet bulb temperature 1,6,12,14.5°C SUZ-KA25VA(H).TH SUZ-KA35VA(H).TH SUZ-KA50VA SUZ-KA60VA 58Hz 58Hz 58Hz 58Hz 25(:) 25(:) 25(:) 25(:) Ambient temperature(˚C) Ambient temperature(˚C) Ambient temperature(˚C) Ambient temperature(˚C)
  • Page 32 PERFORMANCE DATA COOLING operation Rated frequency 58Hz SLZ-KA25VA(L).TH / SUZ-KA25VA.TH, SUZ-KA25VAH.TH CAPACITY : 2.5(kW) INPUT : 690(W) SHF : 0.86 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 2.00 0.68 2.81 1.91 0.68...
  • Page 33 PERFORMANCE DATA COOLING operation Rated frequency 58Hz SLZ-KA25VA(L).TH / SUZ-KA25VA.TH, SUZ-KA25VAH.TH CAPACITY : 2.5(kW) INPUT : 690(W) SHF : 0.86 OUTDOOR D.B.(;) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT D.B.(;) W.B.(;) 2.45 1.67 0.68 2.25 1.53 0.68 2.08 1.41 0.68...
  • Page 34 PERFORMANCE DATA COOLING operation Rated frequency 73Hz SLZ-KA35VA(L).TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH CAPACITY : 3.5(kW) INPUT : 1060(W) SHF : 0.77 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 2.43 0.59 3.94 2.32 0.59 3.78 2.23 0.59 3.64 2.15 0.59...
  • Page 35 PERFORMANCE DATA COOLING operation Rated frequency 73Hz SLZ-KA35VA(L).TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH CAPACITY : 3.5(kW) INPUT : 1060(W) SHF : 0.77 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 2.02 0.59 1039 3.15 1.86 0.59 1102 2.91 1.71 0.59 1145...
  • Page 36 PERFORMANCE DATA COOLING operation Rated frequency 65Hz SLZ-KA50VA(L).TH / SUZ-KA50VA.TH SUZ-KA50VA CAPACITY : 4.6(kW) INPUT : 1630(W) SHF : 0.68 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.41 2.70 0.50 1304 5.18...
  • Page 37 PERFORMANCE DATA COOLING operation Rated frequency 65Hz SLZ-KA50VA(L).TH / SUZ-KA50VA.TH SUZ-KA50VA CAPACITY : 4.6(kW) INPUT : 1630(W) SHF : 0.68 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.51 2.25 0.50 1597 4.14 2.07 0.50 1695...
  • Page 38 PERFORMANCE DATA COOLING operation Rated frequency 63Hz SEZ-KC25VA.W / SUZ-KA25VA.TH, SUZ-KA25VAH.TH CAPACITY : 2.5(kW) INPUT : 730(W) SHF : 0.74 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.65 0.56 2.81 1.58 0.56...
  • Page 39 PERFORMANCE DATA COOLING operation Rated frequency 63Hz SEZ-KC25VA.W / SUZ-KA25VA.TH, SUZ-KA25VAH.TH CAPACITY : 2.5(kW) INPUT : 730(W) SHF : 0.74 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.37 0.56 2.25 1.26 0.56 2.08 1.16 0.56...
  • Page 40 PERFORMANCE DATA COOLING operation Rated frequency 73Hz SEZ-KA35VA.TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH CAPACITY : 3.5(kW) INPUT : 1060(W) SHF : 0.77 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 2.43 0.59 3.94 2.32 0.59 3.78 2.23 0.59 3.64 2.15 0.59...
  • Page 41 PERFORMANCE DATA COOLING operation Rated frequency 73Hz SEZ-KA35VA.TH / SUZ-KA35VA.TH, SUZ-KA35VAH.TH CAPACITY : 3.5(kW) INPUT : 1060(W) SHF : 0.77 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 2.02 0.59 1039 3.15 1.86 0.59 1102 2.91 1.71 0.59 1145...
  • Page 42 PERFORMANCE DATA COOLING operation Rated frequency 80Hz SEZ-KA50VA.TH / SUZ-KA50VA.TH SUZ-KA50VA CAPACITY : 5.0(kW) INPUT : 1780(W) SHF : 0.75 OUTDOOR D.B.(;) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT D.B.(;) W.B.(;) 5.88 3.35 0.57 1424 5.63...
  • Page 43 PERFORMANCE DATA COOLING operation Rated frequency 80Hz SEZ-KA50VA.TH / SUZ-KA50VA.TH SUZ-KA50VA CAPACITY : 5.0(kW) INPUT : 1780(W) SHF : 0.75 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.79 0.57 1744 4.50 2.57 0.57 1851...
  • Page 44 PERFORMANCE DATA COOLING operation Rated frequency 87Hz SEZ-KA60VA.TH / SUZ-KA60VA.TH SUZ-KA60VA CAPACITY : 5.5(kW) INPUT : 1960(W) SHF : 0.75 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.46 3.68 0.57 1568 6.19...

  • Page 45: Indoor Indoor D.b.(;) W.b.(;) Qshc Shf Input Qshc Shf Input

    PERFORMANCE DATA COOLING operation Rated frequency 87Hz SEZ-KA60VA.TH / SUZ-KA60VA.TH SUZ-KA60VA CAPACITY : 5.5(kW) INPUT : 1960(W) SHF : 0.75 OUTDOOR D.B.(;) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT D.B.(;) W.B.(;) 2.60 0.57 2117 5.39 3.07 0.57 1921 4.95...
  • Page 46 PERFORMANCE DATA COOLING operation Rated frequency 61Hz SEZ-KA71VA.TH / SUZ-KA71VA.TH SUZ-KA71VA CAPACITY : 7.1(kW) INPUT : 2460(W) SHF : 0.74 OUTDOOR D.B.( INDOOR INDOOR SHF INPUT SHF INPUT SHF INPUT SHF INPUT D.B.( W.B.( 8.34 4.67 0.56 1968 7.99 4.47 0.56 2066 7.67...

  • Page 47: Noteq : Total Capacity (Kw) Shf : Sensible Heat Factor

    PERFORMANCE DATA COOLING operation Rated frequency 61Hz SEZ-KA71VA.TH / SUZ-KA71VA.TH SUZ-KA71VA CAPACITY : 7.1(kW) INPUT : 2460(W) SHF : 0.74 OUTDOOR D.B.( INDOOR INDOOR D.B.( ; ) W.B.( ; ) SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.96 3.90 0.56 2411 6.39 3.58 0.56...
  • Page 48 PERFORMANCE DATA HEATING operation SLZ-KA25VA(L).TH / SUZ-KA25VA(H).TH Rated frequency 77Hz CAPACITY : 3.0(kW) INPUT : 830(W) OUTDOOR W.B.(;) INDOOR D.B.(;) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.50 1.89 2.28 2.67 3.06 3.45 3.81 4.20 1.41 1.80 2.16 2.55 2.91...
  • Page 49 SEZ-KC25VA.W / SUZ-KA25VA(H).TH Rated frequency 77Hz CAPACITY : 3.0(kW) INPUT : 830(W) OUTDOOR W.B.(;) INDOOR INPUT D.B.(;) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.50 1.89 2.28 2.67 3.06 3.45 3.81 4.20 1.41 1.80 2.16 2.55 2.91 3.30 3.66 4.04 1.23...

  • Page 50: Actuator Control

    <COOL> <HEAT> 5 seconds 5 seconds Compressor R.V.coil ON or OFF ON or OFF Outdoor fan motor 10-3. Relation between main sensor and actuator SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH Actuator Purpose Sensor Outdoor Indoor Defrost Compressor RV-coil fan motor fan motor...

  • Page 51: Service Functions

    (cut) — — — ~67P00330 68P00331~ Serial No. TROUBLESHOOTING SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA 12-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring.
  • Page 52 12-2. 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 53: Wired Remote Controller

    12-2-2. Wired remote controller A CHECK button 1 Turn on the power. B Refrigerant address 2 Press the [CHECK] button twice. C TEMP. button 3 Set refrigerant address with [TEMP] button D IC:Indoor unit if system control is used. 4 Press the [ON/OFF] button to stop the self-check. ˚C OC:Outdoor unit ˚C...
  • Page 54 12-2-4. Outdoor unit failure mode table SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH LED indication Abnormal point Check point Details of abnormal Detection method (Outdoor unit) (Failure mode) 1-time flash every Outdoor thermistors Discharge temperature When thermistors short or open during •Check the outdoor thermistors 2.5 seconds...
  • Page 55 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA Outdoor LED indication Abnormal point Details of abnormal Detecting method Check point (Failure mode) LED1 LED2 Outdoor thermistors Discharge temperature When a short circuit is detected in the • Check the outdoor thermistors. Lighting Once thermistor...
  • Page 56 Abnormal point Outdoor LED indication Details of abnormal Detecting method Check point LED1 LED2 (Failure mode) Overcurrent protection IPM protection When overcurrent is detected after • Check the connection of the compressor Once Goes out 30 seconds of compressor start-up. connecting wire.
  • Page 57 14-time flash Check [output pattern B] (Other abnormality) 2.5 seconds OFF · Check stop valve. 2-time flash Overcurrent When 14A(SUZ-KA25VA(H))/ 24A(SUZ-KA35VA(H)) current 'Outdoor unit · Reconnect connector of compressor. 2.5 seconds OFF protection flows into intelligent power module. stops and ·...
  • Page 58 SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA Indication Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit • Check the connection of the compressor connecting When IPM protection stop or lock protection stop is continuously does not wire. performed three times within 1 minute after the compressor gets operate.
  • Page 59 Indication No. Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit These symptoms do not mean any abnormality of the Primary current protection When the input current exceeds 15A. Once Lighting operates. product, but check the following points. Secondary current protection When the current of the compressor exceeds 15A.
  • Page 60 12-4. Trouble criterion of main parts (1) SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (Part temperature –10˚C ~ 40˚C) (RT61) Abnormal Normal Open or short-circuit 5 k" ~ 55 k"...
  • Page 61 12-4. Trouble criterion of main parts (2) SUZ-KA50VA.TH SUZ-KA50VA SUZ-KA60VA.TH SUZ-KA60VA SUZ-KA71VA.TH SUZ-KA71VA Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Ambient temperature (Part temperature : -10°C ~ 40°C) thermistor (RT65) Outdoor heat exchanger Normal Abnormal temperature thermistor...

  • Page 62: Troubleshooting Flow

    [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] 12-5. Troubleshooting flow Outdoor unit does not operate. How to check inverter/ compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage See B “Check of open phase”. between terminals.
  • Page 63 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] Check of compressor E "Check of compressor Replace the compressor. winding". Is the compressor normal? F "Check of compressor Is the compressor operation time". Does the operation time more than Replace the compressor. compressor operate 10 seconds? continuously? Check the refrigerant circuit.
  • Page 64 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] The thermistors in the outdoor unit are abnormal. Check of outdoor thermistors Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board. Defrost thermistor RT61 (Check the characteristics of each thermistor.) Measure the resistance between CN641 1 and 2.
  • Page 65 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] Outdoor fan motor does not operate. Check of outdoor fan motor Rotate the outdoor fan slowly by hand, and measure the Is the resistance Disconnect CN932 voltage of CN931 (Measurement between each terminal of Turn ON the from the inverter of feedback output).

  • Page 66: Check Of Lev (Expansion Valve)

    [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] Outdoor unit does not operate at all or stops immediately due to over current. Check of current limiting resistor When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Turn ON the power...
  • Page 67 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] Check of LEV (Expansion valve) (For wired remote controller use model) Start Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Is "click - click" sound heard?
  • Page 68 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] Outdoor fan motor does not operate, or stops immediately after starting up. Check of inverter P.C. board Check the outdoor fan motor. Refer to12-5.I. Is the fuse (F901) blown on the inverter P.C. board? Inverter P.C.board Check the connection of the connectors.
  • Page 69 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] How to check mis-wiring and serial signal error (when outdoor unit does not work) (For wired remote controller use model) Turn OFF the power supply. Is there rated voltage in Check the power the power supply? supply.
  • Page 70 [SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH] How to check mis-wiring and serial signal error (when outdoor unit does not work) (For wired remote controller use model) Turn OFF the power supply. Is there rated voltage in the Check the power power supply? supply.

  • Page 71: Electromagnetic Noise Enters Into Tv Sets Or Radios

    [SUZ-KA25/35VA(H).TH SUZ-KA50/60/71VA .TH] Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3m, or is the unit, and/or the antennas and distance between the the outdoor unit.
  • Page 72 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] Outdoor unit does not operate. (LED display: display OFF) Q Q Check of power supply Start Check the connecting of parts of main power supply circuit. Turn on power supply. Is there voltage of 230V AC in the Check the power supply cable.

  • Page 73: Outdoor Unit Does Not Operate

    [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • Outdoor unit does not operate. R R How to check mis-wiring and serial signal error (when outdoor unit does not work) (For wireless remote controller use model) As for indoor unit.
  • Page 74 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] • When unit cannot operate neither by the remote controller. Indoor unit does not operate. • Outdoor unit does not operate. R R How to check mis-wiring and serial signal error (when outdoor unit does not work) (For wired remote controller use model) As for indoor unit.
  • Page 75 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) S S Check of R.V. coil • When heating operation does not work. 1. Disconnect the lead wire leading to the compressor. 2.
  • Page 76 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. T T Check of LEV LED display: LED1 LED2 Lighting Lighting 6 time Goes out Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
  • Page 77 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] • When thermistor is abnormal. v v Check of outdoor thermistors Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board Replace the thermistor. (see below table), and measure the resistance of thermistor. Is the thermistor normal? Reconnect the connector CN661 on the outdoor electronic control P.C.
  • Page 78 [SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA .TH] • When the operation frequency does not go up from lowest frequency. X X Check of HPS SUZ-KA71VA.TH 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off. Infinity Check the resistance between Replace HPS.
  • Page 79 12-6. Test point diagram and voltage 12-6-1. Inverter P.C. board SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH Back side of unit 230V AC Smoothing capacitor Smoothing capacitor Smoothing capacitor DB61 DB61 (C63C) (C63B) (C63A) 280V ~ 370V Fuse (F801) Fuse (F901) LED monitor...
  • Page 80 12-6-2. Power P.C. board SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH Back side of unit Front side of unit Varistor Varistor Varistor (NR63) (NR62) (NR64) 230V AC R.V. coil (CN721) 230V AC Connecting wire with 230V AC inverter P.C.board Heater connector (CN726) (CN722) Refer to 12-5.M...
  • Page 81 12-6-3. Outdoor electronic control P.C. board SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) 100 110 120 Temperature (;) Temperature (;) Fin temperature thermistor (RT64) 10 20 30 40 50 60 70 80 Temperature (;) LED 1 LED 2...
  • Page 82 12-6-4. Noise filter P.C. board SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA CN901 To electronic CN902 CN903 control To power To power P.C. board board board 230V AC 50Hz Input CN912 R.V. coil 230V AC 230V AC 230V AC 50Hz 50Hz Output Output NR64 VARISTOR F64 FUSE...
  • Page 83 12-6-5. Outdoor power board SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Connect to the earth Output (Red) Connect to the controller board (–) (+)1-5(–): Signal transmission (To electronic control P.C. board) (White) 5V DC pulse wave (+)2-5(–): Zero cross signal...

  • Page 84: Disassembly Instructions

    1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH OUTDOOR UNIT OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the cabinet. (1) Remove the screw fixing the service panel. (See Photo 2.) (2) Pull down the service panel and remove it.
  • Page 85 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and power P.C. board (1) Remove the top panel, cabinet and service panel. Screws of the (Refer to 1.) relay panel (2) Disconnect the power supply and indoor/outdoor Screws of connecting wire and remove the back panel.
  • Page 86 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut.
  • Page 87 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 Screw of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 88 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 4 and power board Screws of the power board assembly (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel.(Refer to 1.) (3) Disconnect the following connectors;...
  • Page 89 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temper- Photo 5 ature thermistor, outdoor heat exchanger tempera- Discharge temperature thermistor ture thermistor and ambient temperature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly.
  • Page 90 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 8 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit.

  • Page 91: Parts List

    PARTS LIST (non-RoHS compliant) SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 14-1. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol SUZ- SUZ- SUZ- SUZ- in Wiring Part No. Part Name Remarks KA25VA KA25VAH KA35VA...
  • Page 92 SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 14-2. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9...
  • Page 93 SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 14-2. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring SUZ- SUZ- SUZ- SUZ- Remarks Part No. Part Name KA25VA KA25VAH KA35VA KA35VAH...
  • Page 94 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH 14-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 95 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH 14-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name in Wiring SUZ-KA•VA.TH Remarks Diagram TOP PANEL E02 819 297 E02 851 630 OUTDOOR HEAT EXCHANGER E02 853 630...
  • Page 96 14-4. DRAIN SOCKET Outdoor unit {42 drain hole Soft vinyl chloride hose of 25mm inside diameter. Q'ty/unit Symbol in Wiring Parts No. Parts Name Remarks SUZ-KA25VA.TH SUZ-KA35VA.TH Diagram E02 838 704 DRAIN SOCKET SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH 14-5. ACCESSORY Q'ty/unit Symbol...

  • Page 97: Rohs Parts List

    RoHS PARTS LIST SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 15-1. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring SUZ- SUZ- SUZ- SUZ- Remarks Part No. Part Name KA25VA KA25VAH KA35VA KA35VAH...
  • Page 98 SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 15-2. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9...
  • Page 99 SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA25VAH.TH SUZ-KA35VAH.TH 15-2. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring SUZ- SUZ- SUZ- SUZ- Part Name Remarks Part No. KA25VA KA25VAH KA35VA KA35VAH...
  • Page 100 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA 15-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 101 SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH SUZ-KA50VA .TH SUZ-KA60VA .TH SUZ-KA71VA 15-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name in Wiring SUZ-KA•VA.TH SUZ-KA•VA Remarks Diagram E12 819 297 TOP PANEL...
  • Page 102 [33, 2PCS/SET DRAIN CAP HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Mar. 2007. No.OC322 REVISED EDITION-C PDF 7 Distributed in Oct. 2006. No.OC322 REVISED EDITION-B PDF 7 New publication, effective Mar. 2007 Distributed in Oct.

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