Mitsubishi SUZ-A09VR Technical & Service Manual
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Mitsubishi SUZ-A09VR Technical & Service Manual

Mitsubishi SUZ-A09VR Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R410A
Outdoor unit
[model names]
SUZ-A09VR
SUZ-A12VR
SUZ-A18VR
SUZ-A24VR
SUZ-A09VR.TH SUZ-A12VR.TH
Revision :
• SUZ-A18VR.TH and SUZ-A24VR.TH are added in
REVISED EDITION-A.
NOTE:
This service manual describes technical data of the
outdoor units.
•As for indoor units SLZ-A09AR.TH, SLZ-A12AR.TH,
SLZ-A18AR.TH, SEZ-A12AR.TH, SEZ-A18AR.TH,
SEZ-A24AR.TH and SEZ-A09CR.W, refer to the service
manual OC302 and OC303.
• Please void OC304.
[Service Ref.]
SUZ-A09VR.TH
SUZ-A12VR.TH
SUZ-A18VR.TH
SUZ-A24VR.TH
CONTENTS
2. TECHNICAL CHANGES ···································3
3. PART NAMES AND FUNCTIONS······················6
Indication of
4. SPECIFICATION·················································7
model name
5. NOISE CRITERIA CURVES ·····························11
6. OUTLINES AND DIMENSIONS ·······················12
7. WIRING DIAGRAM ··········································14
8. REFRIGERANT SYSTEM DIAGRAM ··············16
9. PERFORMANCE CURVES ······························19
10. ACTUATOR CONTROL····································41
11. SERVICE FUNCTIONS·····································42
12. TROUBLESHOOTING······································42
13. DISASSEMBLY INSTRUCTIONS·····················71
14. PARTS LIST······················································79
No.OC304
REVISED EDITION-A
HFC
utilized
R410A

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Summary of Contents for Mitsubishi SUZ-A09VR

  • Page 1: Table Of Contents

    6. OUTLINES AND DIMENSIONS ·······················12 7. WIRING DIAGRAM ··········································14 8. REFRIGERANT SYSTEM DIAGRAM ··············16 9. PERFORMANCE CURVES ······························19 10. ACTUATOR CONTROL····································41 SUZ-A09VR.TH SUZ-A12VR.TH 11. SERVICE FUNCTIONS·····································42 12. TROUBLESHOOTING······································42 Revision : • SUZ-A18VR.TH and SUZ-A24VR.TH are added in 13. DISASSEMBLY INSTRUCTIONS·····················71 REVISED EDITION-A.

  • Page 2: Combination Of Indoor And Outdoor Units

    COMBINATION OF INDOOR AND OUTDOOR UNITS Outdoor unit Heat pump type Indoor unit SUZ- Service A09VR.TH A12VR.TH A18VR.TH A24VR.TH Service Ref. Manual No. — — SLZ-A09AR.TH — — OC302 — SLZ-A12AR.TH — — — SLZ-A18AR.TH — — — — SEZ-A09CR.W —...

  • 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). f [Gauge]) The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f -0.5 -30 -20 -10 1.
  • Page 5 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter R410A 6.35 9.52 12.7 3. Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS SUZ-A09VR.TH ACCESSORIES SUZ-A12VR.TH OUTDOOR UNIT Air inlet (back and side) SUZ-A09VR.TH Piping SUZ-A12VR.TH Drain hose Drain socket Air outlet Drain outlet SUZ-A18VR.TH ACCESSORIES SUZ-A24VR.TH OUTDOOR UNIT Air inlet (back and side) SUZ-A18VR.TH SUZ-A24VR.TH Piping Drain socket...

  • Page 7: Specification

    SPECIFICATION SLZ-A•AR.TH / SUZ-A•VR.TH SUZ-A09VR.TH SUZ-A12VR.TH SUZ-A18VR.TH Outdoor Service Ref. Indoor Service Ref. Indoor Service Ref. Indoor Service Ref. SLZ-A09AR.TH SLZ-A12AR.TH SLZ-A18AR.TH Cooling Heating Cooling Cooling Function Heating Heating Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Rated frequency(Min.~Max.)
  • Page 8 SEZ-A•CR.W / SUZ-A•VR.TH SUZ-A09VR.TH Outdoor Service Ref. Indoor Service Ref. SEZ-A09CR.W Cooling Heating Function Single phase Power supply 230V,50Hz 2.4 (1.0-3.2) Capacity Rated frequency(Min.~Max.) 3.0 (0.9-4.2) Dehumidification — Air flow 1900 K /h Starting current 4.30 Compressor motor current 1 3.08...
  • Page 9 SEZ-A•AR.TH / SUZ-A•VR.TH SUZ-A12VR.TH SUZ-A18VR.TH SUZ-A24VR.TH Indoor Service Ref. Indoor Service Ref. Indoor Service Ref. Outdoor Service Ref. SEZ-A12AR.TH SEZ-A18AR.TH SEZ-A24AR.TH Cooling Cooling Function Cooling Heating Heating Heating Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Rated frequency(Min.~Max.) 3.4 (1.0-3.8) 3.9 (0.9-5.0) 5.0(1.1-5.6)
  • Page 10 Specifications and rating conditions of main electric parts SUZ-A09VR.TH SUZ-A12VR.TH Model SUZ-A09VR.TH SUZ-A12VR.TH Item (CT) Current transformer ETQ19Z53AY (CT761, CT781) Current transformer ETQ19Z71AY (C62A, C62B, C61B) Smoothing capacitor 680+ 420V Outdoor fan capacitor (C65) 1.8+ 440V (DB61, DB65) Diode module...

  • Page 11: Noise Criteria Curves

    NOISE CRITERIA CURVES SUZ-A09VR.TH SUZ-A12VR.TH SPEED FUNCTION SPL(dB) LINE FAN SPEED FUNCTION SPL(dB) LINE COOLING COOLING High High 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-A09VR.TH Unit: mm SUZ-A12VR.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 Air in Air in Open two sides of left, right, or rear side.
  • Page 13 SUZ-A18VR.TH Unit: mm SUZ-A24VR.TH 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, 350mm or more both sides and top are open...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM SUZ-A09VR.TH SUZ-A12VR.TH OUTDOOR UNIT...
  • Page 15 SUZ-A18VR.TH SUZ-A24VR.TH OUTDOOR UNIT...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SUZ-A09VR.TH Unit:mm SUZ-A12VR.TH OUTDOOR UNIT 4-way valve Refrigerant pipe [9.52 (with heat insulator) Muffler Stop valve (with service port) Outdoor Discharge heat Flared connection temperatuer Muffler exchanger thermistor Defrost RT62 thermistor Ambient RT61 temperature thermistor RT65 Compressor...
  • Page 17 SUZ-A09VR.TH SUZ-A12VR.TH MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Models Max. length : m Liquid SUZ-A09VR.TH 9.52 6.35 SUZ-A12VR.TH MAX. HEIGHT DIFFERENCE Indoor (SLZ/SEZ) unit w Max. Height difference 12m Refrigerant Piping Max. length Outdoor unit w Height difference should be within 12m regardless of which unit, indoor or outdoor position is high.
  • Page 18 SUZ-A18VR.TH SUZ-A24VR.TH MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit 12.7 SUZ-A18VR.TH Gas 0.43 Gas 0 6.35 Liquid 0.5 Liquid 0 SUZ-A24VR.TH 15.88 MAX.

  • Page 19: Performance Curves

    PERFORMANCE CURVES SLZ-A09AR.TH / SUZ-A09VR.TH SLZ-A12AR.TH / SUZ-A12VR.TH SLZ-A18AR.TH / SUZ-A18VR.TH The standard data contained in these specifications apply 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 20 15.2 10.9 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-A09VR.TH SUZ-A09VR.TH SUZ-A09VR.TH SUZ-A09VR.TH Correction of Heating total input Correction of Cooling total input...
  • Page 21 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Relative humidity(%) Dry-bulb temperature 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 57Hz(SUZ-A09VR.TH) 67Hz(SUZ-A12VR.TH) 75Hz(SUZ-A18VR.TH) SUZ-A12VR.TH SUZ-A18VR.TH SUZ-A09VR.TH (kgf/F [Gauge])
  • Page 22 SEZ-A09CR.W / SUZ-A09VR.TH SEZ-A12AR.TH / SUZ-A12VR.TH SEZ-A18AR.TH / SUZ-A18VR.TH SEZ-A24AR.TH / SUZ-A24VR.TH The standard data contained in these specifications apply 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 Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 25.2 22.1 24.5 25.3 23.2 20.4 22.6 23.3 21.3 18.7 20.7 21.4 19.4 17.0 18.9 19.4 17.4 15.3 17.0 17.5 15.5 13.6 15.1 15.5 13.6 11.9 13.2 13.6 11.6 10.2 11.3...
  • Page 24 SUZ-A09VR.TH SUZ-A09VR.TH SUZ-A09VR.TH SUZ-A09VR.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-A12VR.TH...
  • Page 25 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Relative humidity(%) Dry-bulb temperature 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 57Hz(SUZ-A09VR.TH) 67Hz(SUZ-A12VR.TH) 80Hz(SUZ-A18VR.TH) 87Hz(SUZ-A24VR.TH) SUZ-A09VR.TH SUZ-A12VR.TH SUZ-A18VR.TH SUZ-A24VR.TH...
  • Page 26 PERFORMANCE DATA COOLING operation Rated frequency 57Hz SLZ-A09AR.TH / SUZ-A09VR.TH CAPACITY : 2.5(kW) INPUT : 760(W) SHF : 0.85 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.97 0.67 2.81...
  • Page 27 PERFORMANCE DATA COOLING operation Rated frequency 57Hz SLZ-A09AR.TH / SUZ-A09VR.TH CAPACITY : 2.5(kW) INPUT : 760(W) SHF : 0.85 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.64 0.67 2.25 1.51 0.67 2.08...
  • Page 28 PERFORMANCE DATA COOLING operation Rated frequency 67Hz SLZ-A12AR.TH / SUZ-A12VR.TH CAPACITY : 3.2(kW) INPUT : 1060(W) SHF : 0.79 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.76 2.29 0.61 3.60 2.20 0.61...
  • Page 29 PERFORMANCE DATA COOLING operation Rated frequency 67Hz SLZ-A12AR.TH / SUZ-A12VR.TH CAPACITY : 3.2(kW) INPUT : 1060(W) SHF : 0.79 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.14 1.91 0.61 1039 2.88 1.76 0.61 1102 2.66...
  • Page 30 PERFORMANCE DATA COOLING operation Rated frequency 65Hz SLZ-A18AR.TH / SUZ-A18VR.TH CAPACITY : 4.6(kW) INPUT : 1630(W) SHF : 0.68 OUTDOOR D.B.(;) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT D.B.(;) W.B.(;) 5.41 2.70 0.50 1304 5.18 2.59...
  • Page 31 PERFORMANCE DATA COOLING operation Rated frequency 65Hz SLZ-A18AR.TH / SUZ-A18VR.TH 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 3.82...
  • Page 32 PERFORMANCE DATA COOLING operation Rated frequency 57Hz SEZ-A09CR.W / SUZ-A09VR.TH CAPACITY : 2.4(kW) INPUT : 740(W) SHF : 0.78 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 1.50 0.60 2.82 1.69...
  • Page 33 PERFORMANCE DATA COOLING operation Rated frequency 57Hz SEZ-A09CR.W / SUZ-A09VR.TH CAPACITY : 2.4(kW) INPUT : 740(W) SHF : 0.78 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 1.30 0.60 1.99 1.20 0.60 2.35 1.41...
  • Page 34 PERFORMANCE DATA COOLING operation Rated frequency 67Hz SEZ-A12AR.TH / SUZ-A12VR.TH CAPACITY : 3.4(kW) INPUT : 1090(W) SHF : 0.79 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.44 0.61 3.83 2.33 0.61 3.67...
  • Page 35 PERFORMANCE DATA COOLING operation Rated frequency 67Hz SEZ-A12AR.TH / SUZ-A12VR.TH CAPACITY : 3.4(kW) INPUT : 1090(W) SHF : 0.79 OUTDOOR D.B.(;) INDOOR INDOOR D.B.(;) W.B.(;) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.33 2.03 0.61 1068 3.06 1.87 0.61 1134 2.82...
  • Page 36 PERFORMANCE DATA COOLING operation Rated frequency 80Hz SEZ-A18AR.TH / SUZ-A18VR.TH 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 SHC SHF INPUT 5.88 3.35 0.57 1424 5.63 3.21...
  • Page 37 PERFORMANCE DATA COOLING operation Rated frequency 80Hz SEZ-A18AR.TH / SUZ-A18VR.TH 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 4.15...
  • Page 38 PERFORMANCE DATA COOLING operation Rated frequency 87Hz SEZ-A24AR.TH / SUZ-A24VR.TH 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 3.53...
  • Page 39 PERFORMANCE DATA COOLING operation Rated frequency 87Hz SEZ-A24AR.TH / SUZ-A24VR.TH 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.(;) 5.39 3.07 0.57 1921 4.95 2.82 0.57 2038 4.57...
  • Page 40 PERFORMANCE DATA HEATING operation SLZ-A09AR.TH / SUZ-A09VR.TH Rated frequency 75Hz CAPACITY : 3.0(kW) INPUT : 870(W) OUTDOOR W.B.(;) INDOOR D.B.(;) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.89 2.28 2.67 3.06 3.45 3.81 4.20 1.80 2.16 2.55 2.91 1000 3.30 3.66...

  • Page 41: Actuator Control

    ACTUATOR CONTROL SUZ-A09VR.TH SUZ-A12VR.TH SUZ-A18VR.TH SUZ-A24VR.TH 10-1. 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 42: Service Functions

    3) If the inverter P.C. board or electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration. 4) When troubleshooting, refer to the flow chart on page 43 for SLZ-A09AR.TH, SLZ-A12AR.TH, SUZ-A09VR.TH and SUZ-A12VR.TH and page 45 for SLZ-A18AR.TH and SUZ-A18VR.TH.
  • Page 43 12-2. Instruction of troubleshooting (1) (SLZ-A09AR.TH / SUZ-A09VR.TH) (SLZ-A12AR.TH / SUZ-A12VR.TH) OPERATION INDICATOR lamp EMERGENCY OPERATION switch (COOL) EMERGENCY OPERATION switch (HEAT)
  • Page 44 12-2. Instruction of troubleshooting (2) (SEZ-A09CR.W / SUZ-A09VR.TH) (SEZ-A12AR.TH / SUZ-A12VR.TH)
  • Page 45 12-2. Instruction of troubleshooting (3) (SLZ-A18AR.TH / SUZ-A18VR.TH) OPERATION INDICATOR lamp EMERGENCY OPERATION switch (COOL) EMERGENCY OPERATION switch (HEAT)
  • Page 46 12-2. Instruction of troubleshooting (4) (SEZ-A18AR.TH / SUZ-A18VR.TH) (SEZ-A24AR.TH / SUZ-A24VR.TH)
  • Page 47 2.5 seconds OFF compressor" on page 52. Outdoor unit Frequency drop by The unit is normal, but check the 1-time flash When current from power outlet exceeds 8A(SUZ-A09VR.TH)/ operates (at current protection following. 2.5 seconds OFF 9A(SUZ-A12VR.TH), compressor frequency lowers.
  • Page 48 12-2-1. Troubleshooting check table (2) SUZ-A18VR.TH SUZ-A24VR.TH LED 1 (Red) LED 2 (Yellow) Error mode Refer to page 68. Lighting Lighting Normal Symptom: Outdoor unit does not operate. Indication Abnormal point Detecting method Check points LED 1 LED 2 (Red) (Yellow) When the compressor operation has been interrupted by over current protection continuously three times within 1 minute after start-up, or...
  • Page 49 Symptom: Outdoor unit operates (The compressor operates at reduced frequency) Indication Abnormal point Detecting method Check points LED 1 LED 2 (Red) (Yellow) Once Lighting Current protection When the outdoor unit input current exceeds 14.5A. Twice Lighting High-pressure protection When the indoor gas pipe temperature exceeds 55˚C during heating. Twice Lighting Defrosting in cooling When the indoor gas pipe temperature falls to 6˚C or below during cooling.
  • Page 50 12-2-2. Trouble criterion of main parts (1) SUZ-A09VR.TH SUZ-A12VR.TH Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (Part temperature –15˚C ~ 40˚C) (RT61) Normal Abnormal Open or short-circuit 5 k" ~ 65 k"...
  • Page 51 12-2-2. Trouble criterion of main parts (2) SUZ-A18VR.TH SUZ-A24VR.TH Part name Check method and criterion Defrost thermistor (RT62) Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C) Outdoor heat exchanger Normal abnormal temperature thermistor Open or short-circuit 5kΩ...
  • Page 52 [SUZ-A09VR.TH SUZ-A12VR.TH] (Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes 5-time. (Only SEZ-A09CR.W, SEZ-A12AR.TH) Error code “4210” displays on remote controller. Outdoor unit does not operate. How to check inverter/ compressor Disconnect the connector (CN61) between compressor and power transistor module (IPM).
  • Page 53 [SUZ-A09VR.TH SUZ-A12VR.TH] Check of compressor Start E "Check of compressor Replace the compressor. winding" on page 53. Is the compressor normal? F "Check of compressor Is the compressor operation time" on page operation time more than Replace the compressor. 53. Does the compressor...
  • Page 54 [SUZ-A09VR.TH SUZ-A12VR.TH] (Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes 6-time. (Only SEZ-A09CR.W, SEZ-A12AR.TH) Error code “5102” and “OC” displays on remote controller. 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.
  • Page 55 [SUZ-A09VR.TH SUZ-A12VR.TH] Outdoor fan motor does not operate. Check of outdoor fan motor Check the resistance of fan motor. (Refer to page 50.) Replace the outdoor Is the resistance of fan fan motor. motor normal? Disconnect the connector CN771 on the power P.C. board.
  • Page 56 [SUZ-A09VR.TH SUZ-A12VR.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 may not work properly. No ∞ Replace the power P.C. board.
  • Page 57 [SUZ-A09VR.TH SUZ-A12VR.TH] (Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring w Short circuit of JPG and JPS on the indoor Start controller board enables self-check to be displayed in 3 seconds.
  • Page 58 [SUZ-A09VR.TH SUZ-A12VR.TH] (Only SEZ-A09CR.W, SEZ-A12AR.TH) ERROR CODE “6800” displays on remote controller. Outdoor unit doesn’t operate. How to check mis-wiring w Short circuit of JPG and JPS on the indoor Start controller board enables self-check to be displayed in 3 seconds.
  • Page 59 [SUZ-A18VR.TH SUZ-A24VR.TH] (Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes 5-time. (Only SEZ-A18AR.TH, SEZ-A24AR.TH) Error code “4210” displays on remote controller. Outdoor unit does not operate. • When heating, room does not get warm. • When cooling, room does not get cool. O O Check of inverter/ compressor LED display: LED1...
  • Page 60 [SUZ-A18VR.TH SUZ-A24VR.TH] (Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes 6-time. (Only SEZ-A18AR.TH, SEZ-A24AR.TH) Error code “5102” and “OC” displays on remote controller. • When thermistor is abnormal. (When the LED display is a table below.) P P Check of outdoor thermistors Start Disconnect the connector in the electronic control P.C.
  • Page 61 [SUZ-A18VR.TH SUZ-A24VR.TH] The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) Q Q Check of R.V. coil • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2.
  • Page 62 [SUZ-A18VR.TH SUZ-A24VR.TH] • Fan motor does not operate or stops operating shortly after starting the operation. R R Check of outdoor fan motor Start Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? Disconnect CN932 from outdoor electronic control P.C.
  • Page 63 [SUZ-A18VR.TH SUZ-A24VR.TH] Outdoor unit does not operate. (LED display: display OFF) S S 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 64 [SUZ-A18VR.TH SUZ-A24VR.TH] (Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. (LED display: Both LED1 and LED2 lighting) U U How to check mis-wiring and serial signal error (when outdoor unit does not work) w Short circuit of JPG and JPS on the indoor Start controller board enables self-check to be...
  • Page 65 [SUZ-A18VR.TH SUZ-A24VR.TH] (Only SEZ-A18AR.TH, SEZ-A24AR.TH) ERROR CODE “6800” displays on remote controller. Outdoor unit doesn’t operate. (LED display: Both LED1 and LED2 lighting) U U How to check mis-wiring and serial signal error (when outdoor unit does not work) w Short circuit of JPG and JPS on the indoor Start controller board enables self-check to be displayed in 3 seconds.
  • Page 66 SUZ-A09VR.TH SUZ-A12VR.TH Inverter P.C. board (Refer to page 52.) LD66A LD61A Jumper wire for change in defrost setting (JS) 280V ~ 370V DC 230V AC (Refer to page 42.) Back side of unit LED monitor lamp Output to drive Connecting...
  • Page 67 SUZ-A09VR.TH SUZ-A12VR.TH Power P.C. board Connecting wire with inverter P.C. board (CN726) R.V. coil (CN721) Back side of unit Front side of unit 230V AC Output to drive outdoor fan motor (CN771) 230V AC 230V AC...
  • Page 68 SUZ-A18VR.TH SUZ-A24VR.TH Defrost temperature thermistor (RT62) Electronic control P.C. board Fin temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT61) 10 20 30 40 50 60 70 80 Temperature (;) 100 110 120 Temperature (;) Temperature (;) LED 1 LED 2 CN601...
  • Page 69 SUZ-A18VR.TH SUZ-A24VR.TH Noise filter P.C.board CN901 Electronic control CN902 CN903 230V AC board Power board 50Hz Input CN912 R.V. coil 230V AC 230V AC 50Hz Output F911 FUSE F912 FUSE 1A/250V 3.15A/250V NR63 VARISTOR...
  • Page 70 SUZ-A18VR.TH SUZ-A24VR.TH Power board Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (–) (White) Connect to the earth Signal reception (From electronic control P.C. board) 5V DC pulse wave Fin temperature thermistor RT65 Primary current detection (Connect to the noise filter) Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C.

  • Page 71: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector SUZ-A09VR.TH SUZ-A12VR.TH OUTDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the cabinet. Photo 1 (1) Remove the screws fixing the top panel. (Photo 1) (2) Remove the top panel. (Photo 1) Screws of (3) Remove the screw fixing the service panel.
  • Page 72 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. (Refer to 1.) Screws of the relay panel (2) Disconnect the indoor/outdoor connecting wire and remove the back panel.
  • Page 73 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor and discharge tem- Photo 5 R.V. coil perature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Remove the inverter assembly.
  • Page 74 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 7 (1) Remove the top panel, cabinet and service panel. Screws of (Refer to 1.) outdoor Propeller (2) Disconnect the indoor/outdoor connecting wire and remove fan motor the back panel. (Refer to 1.) (3) Remove the inverter assembly.
  • Page 75 SUZ-A18VR.TH SUZ-A24VR.TH 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. (4) Remove the service panel.
  • Page 76 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, electronic control Photo 4 P.C. board, noise filter P.C. board 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. (3) Disconnect the following connectors;...
  • Page 77 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temper- Photo 5 ature thermistor and outdoor heat exchanger tem- Discharge temperature thermistor perature 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 78 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 79: Parts List

    PARTS LIST SUZ-A09VR.TH SUZ-A12VR.TH 14-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 10 9 Part number that is circled is not shown in the illustration. Symbol Q'ty/unit in Wiring Part Name Remarks Part No. SUZ-A09VR.TH SUZ-A12VR.TH Diagram E02 838 232...

  • Page 80: Electrical Parts

    SUZ-A09VR.TH SUZ-A12VR.TH 14-2. OUTDOOR UNIT ELECTRICAL PARTS Q'ty/unit Symbol in Wiring Part No. Part Name Remarks SUZ-A09VR.TH SUZ-A12VR.TH Diagram E02 838 337 REACTOR E02 838 444 POWER P.C. BOARD E02 838 490 REVERSING VALVE COIL 21S4 E02 838 306 THERMISTOR SET...
  • Page 81 SUZ-A09VR.TH SUZ-A12VR.TH 14-3. 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-A09VR.TH SUZ-A12VR.TH Diagram E02 838 704 DRAIN SOCKET...
  • Page 82 SUZ-A18VR.TH SUZ-A24VR.TH 14-4. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 83 Part numbers that are circled are not shown in the illustration. Symbol Q'ty/unit Remarks Part No. Part Name in Wiring SUZ-A18VR.TH SUZ-A24VR.TH Diagram E02 819 297 TOP PANEL E02 851 630 OUTDOOR HEAT EXCHANGER E02 851 301 PM8H60- OUTDOOR FAN MOTOR E02 851 501 PROPELLER E02 851 290...
  • Page 84 E02 817 704 DRAIN SOCKET E02 444 705 DRAIN CAP HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Jun. 2004 Distributed in Jun. 2004. No.OC304 REVISED EDITION-A PDF 8 Specifications subject to change without notice Distributed in Mar.

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