Mitsubishi Electric SUZ-M25VA Technical & Service Manual
Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R32
[Model Name]
[Service Ref.]
SUZ-M25VA.TH
SUZ-M25VA
SUZ-M25VA-ET.TH
SUZ-M25VA-ET
SUZ-M35VA.TH
SUZ-M35VA
SUZ-M35VA-ET.TH
SUZ-M35VA-ET
SUZ-M50VA.TH
SUZ-M50VA
SUZ-M50VA-ET.TH
SUZ-M50VA-ET
SUZ-M60VA.TH
SUZ-M60VA
SUZ-M60VA-ET.TH
SUZ-M60VA-ET
SUZ-M71VA.TH
SUZ-M71VA
SUZ-M71VA-ET.TH
SUZ-M71VA-ET
SUZ-M25VA.TH
SUZ-M35VA.TH
CONTENTS
2. SAFETY PRECAUTION .................................... 2
3. PARTS NAMES AND FUNCTIONS ................ 10
4. SPECIFICATION ............................................... 11
5. NOISE CRITERIA CURVES ............................ 13
6. OUTLINES AND DIMENSIONS ...................... 14
7. WIRING DIAGRAM .......................................... 16
8. REFRIGERANT SYSTEM DIAGRAM ............. 20
9. ACTUATOR CONTROL ................................... 23
10. SERVICE FUNCTIONS .................................... 24
11. TROUBLESHOOTING ..................................... 24
12. DISASSEMBLY PROCEDURE ........................ 41
PARTS CATALOG (OCB684)
December 2018
No. OCH684
HFC
utilized
R32
Note:
•This service manual
describes service data of
the outdoor units only.
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Table of Contents
Troubleshooting
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Summary of Contents for Mitsubishi Electric SUZ-M25VA
- Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2018 No. OCH684 utilized TECHNICAL & SERVICE MANUAL [Model Name] [Service Ref.] Note: SUZ-M25VA.TH SUZ-M25VA •This service manual SUZ-M25VA-ET.TH SUZ-M25VA-ET describes service data of the outdoor units only. SUZ-M35VA.TH SUZ-M35VA SUZ-M35VA-ET.TH SUZ-M35VA-ET SUZ-M50VA.TH SUZ-M50VA SUZ-M50VA-ET.TH...
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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 M25VA.TH M35VA.TH M50VA.TH M60VA.TH M71VA.TH Service Ref. M25VA-ET.TH M35VA-ET.TH M50VA-ET.TH M60VA-ET.TH M71VA-ET.TH manual No. SLZ-M25FA.TH ─ ─ ─ ─ SLZ-M35FA.TH OCH522A ─... - Page 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R32 Preparation before the repair service Precautions during the repair service • Prepare the proper tools. • Do not perform the work involving the electric parts with wet hands. •...
- Page 4 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
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Page 5: Specification
[2] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized. - Page 6 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
- Page 7 b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; •...
- Page 8 2-3. Choosing the outdoor unit installation location R32 is heavier than air—as well as other refrigerants— so tends to accumulate at the base (in the vicinity of the floor). If R32 accumulates around base, it may reach a flammable concentration in case room is small. To avoid ignition, maintaining a safe work environment is required by ensuring appropriate ventilation.
- Page 9 C) Create an appropriate ventilation open area. Make sure that the width of the open area is 0.9 [m] or more and the height of the open area is 0.15 [m] or more. However, the height from the bottom of the installation space to the bottom edge of the open area should be 0.125 [m] or less.
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Page 10: Parts Names And Functions
PARTS NAMES AND FUNCTIONS SUZ-M25VA.TH SUZ-M25VA-ET.TH SUZ-M35VA.TH Air inlet SUZ-M35VA-ET.TH (back and side) Piping Air outlet Drain hose Drain outlet SUZ-M50VA.TH SUZ-M50VA-ET.TH Air inlet (back and side) Piping Air outlet Drain hose Drain outlet SUZ-M60VA.TH SUZ-M60VA-ET.TH SUZ-M71VA.TH Air inlet SUZ-M71VA-ET.TH... - Page 11 SPECIFICATION SUZ-M25VA SUZ-M35VA SUZ-M50VA SUZ-M60VA SUZ-M71VA Outdoor model (-ET) (-ET) (-ET) (-ET) (-ET) Power supply Single phase 230 V, 50 Hz Model KVB073FYXMC SV092FBAMT SVB130FBBMT SVB172FCKMT Output 1,200 Cooling 2.78 3.90 6.81 7.56 8.26 Compressor Current* Heating 3.50 4.77 7.71 8.46...
- Page 12 Specifications and rating conditions of main electric parts Model SUZ-M25VA SUZ-M35VA SUZ-M50VA SUZ-M60VA SUZ-M71VA (-ET) (-ET) (-ET) (-ET) (-ET) Item (C61) — 620 μF 420 V 620 μF 420 V — — Smoothing (C62, C63) 620 μF 420 V 620 μF 420 V 620 μF420 V...
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Page 13: Table Of Contents
NOISE CRITERIA CURVES SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.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... -
Page 14: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH mm (inch) Unit: mm SUZ-M50VA.TH SUZ-M50VA-ET.TH mm (inch) OCH684... - Page 15 SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH Unit: mm REQUIRED SPACE *1 500 mm or more when front and sides of the unit are clear 417.5 Air in Air in Air out 2-holes 10 21 *2 When any 2 sides of left, right and rear of the unit are clear Service panel Liquid refrigerant pipe joint...
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Page 16: Wiring Diagram
WIRING DIAGRAM SUZ-M25VA.TH SUZ-M25VA-ET.TH OCH684... - Page 17 SUZ-M35VA.TH SUZ-M35VA-ET.TH OCH684...
- Page 18 SUZ-M50VA.TH SUZ-M50VA-ET.TH OCH684...
- Page 19 SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH OCH684...
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Page 20: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH Unit: mm Refrigerant pipe ø9.52 4-way valve (with heat insulator) Strainer Outdoor heat exchanger Muffler Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62... -
Page 21: Suz-M60Va.th
SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH Unit: mm Strainer Refrigerant pipe ø 15.88 #100 4-way valve (with heat insulator) Strainer Stop valve (with service port) Outdoor Muffler Flared connection Discharge heat Ambient temperature exchanger temperature Defrost thermistor thermistor thermistor RT62 RT65 RT61 Compressor Outdoor heat Capillary tube... - Page 22 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid SUZ-M25VA(-ET) 9.52 SUZ-M35VA(-ET) 6.35 SUZ-M50VA(-ET) 12.7 SUZ-M60VA(-ET) 15.88 SUZ-M71VA(-ET) 9.52 MAX. HEIGHT DIFFERENCE Indoor unit * Max. Height difference Max. Length Outdoor unit * Height difference limitations are binding regardless of the height position at which either indoor or outdoor is placed higher.
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Page 23: Actuator Control
ACTUATOR CONTROL SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M50VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH SUZ-M50VA-ET.TH SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.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 24: Service Functions
SERVICE FUNCTIONS SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M50VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH SUZ-M50VA-ET.TH SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.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. - Page 25 11-2. TROUBLESHOOTING CHECK TABLE Abnormal point/ check Symptoms Condition Remedy Condition indication code Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compressor. Outdoor unit 1-time blink Outdoor power sys- • Refer to 11-5. "How to check in- does not op- within 1 minute after the compressor gets started.
- Page 26 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 27 11-3-2. Remote controller check <PAR-3xMAA ("x" represents 0 or later)> 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"...
- Page 28 11-3-3. Self-diagnosis <PAC-YT52CRA> Retrieve the error history of each unit using the Simple MA controller. Switch to the self-diagnosis mode. button are pressed for 5 seconds or longer, the figure shown below is When the A button and the displayed. Set the address or refrigerant address No.
- Page 29 11-3-4. Remote Controller Check <PAC-YT52CRA> When the air conditioner cannot be controlled from the Simple MA controller, use this function to check the remote controller. 1 First, check the power mark. When normal voltage (12 V DC) is not applied to the remote controller, the power mark goes off. When the power mark is off, check the remote controller wiring and the indoor unit.
- Page 30 11-3-5. Self-diagnosis <Wireless remote controller> For SLZ model, refer to the indoor unit's service manual. <In case of trouble during operation, except for SLZ model*> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop.
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Page 31: Heating
• Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern 0.5 s 0.5 s 0.5 s Approx. 2.5 s Approx. - Page 32 11-4. TROUBLE CRITERION OF MAIN PARTS SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M50VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH SUZ-M50VA-ET.TH SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.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. (M25/35/50) or thermistor (RT65) 11-6-2.
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Page 33: Troubleshooting Flow
11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the intelligent power module (IC700) Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. - Page 34 D Check of compressor winding Disconnect the connector between the compressor and the intelligent power module, and measure the resistance between the compressor terminals. <Measurement point> Measure the resistance between the lead wires at 3 points. BK-WH BK-RD WH-RD <Judgement> Refer to "11-4.
- Page 35 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. TROUBLE CRITERION OF MAIN PARTS". In case CN721(M25/35/50)/CN602(M60/71) 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 36 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 37 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 38: Cooling
Check of outdoor refrigerant circuit The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again. - Page 39 11-6. TEST POINT DIAGRAM AND VOLTAGE 11-6-1. Inverter P.C. board SUZ-M25VA.TH SUZ-M35VA.TH SUZ-M50VA.TH SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH SUZ-M50VA-ET.TH R.V.coil Smoothing Smoothing Smoothing Defrost heater (CN721) DB61 capacitor Back side of unit capacitor (C61) capacitor (CN722) 230 V AC 260 - 370 V DC...
- Page 40 11-6-2. Inverter P.C. board SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH Jumper wire for pre-heat control setting (JK) LEV (CN724) Jumper wire for changing defrost setting (JS) Ambient temperature thermistor/RT65 (CN672) Outdoor heat exchanger temperature thermistor R.V. coil (CN602) /RT68 (CN671) 230 V AC Discharge temperature thermistor/RT62 (CN671)
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Page 41: Disassembly Procedure
Locking lever lever. Connector SUZ-M25VA.TH SUZ-M35VA.TH : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. SUZ-M25VA-ET.TH SUZ-M35VA-ET.TH NOTE: Turn OFF the power supply before disassembly. - Page 42 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 4 (1) Remove the cabinet and panels. (Refer to section 1.) Screws of the heat sink Screws of the terminal block (2) Disconnect the lead wire to the reactor and the following con- support and the separator support and the back panel nectors:...
- Page 43 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 7 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Ambient temperature CN931, CN932 (Fan motor) thermistor (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 44 SUZ-M50VA.TH SUZ-M50VA-ET.TH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 45 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screw of the P.B. support board and the separator Screw of the heat sink (1) Remove the cabinet and panels. (Refer to section 1.) Screws of support and the separator (2) Disconnect the lead wire to the reactor and the following con- the terminal block nectors:...
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Page 46: Och684
OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 6 Screw of the R.V. coil (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. Discharge temperature thermistor Outdoor heat Photo 7... - Page 47 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 9 Discharge pipe (1) Remove the cabinet and panels. (Refer to section 1.) Suction pipe brazed part (2) Remove the inverter assembly. (Refer to section 2.) brazed part (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm...
- Page 48 SUZ-M60VA.TH SUZ-M71VA.TH SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. Screws of the top panel (3) Remove the screw of the valve cover.
- Page 49 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screws of the relay panel Inverter P.C board board (1) Remove the cabinet and the service panel. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 50 OPERATING PROCEDURE PHOTOS/FIGURES Screw of 3. Removing R.V. coil Photo 5 the R.V. coil (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (3) Remove the R.V. coil. Brazed parts of 4-way valve 4.
- Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 7 Propeller fan (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) Propeller fan (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 52 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Specifications are subject to change without notice. Published: Dec. 2018 No. OCH684 Made in Japan...