Mitsubishi Mr.Slim SUZ-SM71VA.TH Technical & Service Manual
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Mitsubishi Mr.Slim SUZ-SM71VA.TH Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
R32
Outdoor unit
[Model Name]
SUZ-SM71VA
[Service Ref.]
SUZ-SM71VA.TH
Indication of
model name
Note:
• This service manual describes
technical data of the outdoor
units only.
CONTENTS
2. SAFETY PRECAUTION .................................... 2
3. PARTS NAMES AND FUNCTIONS ................ 10
4. SPECIFICATION .............................................. 10
5. NOISE CRITERIA CURVES ............................. 11
6. OUTLINES AND DIMENSIONS ...................... 12
7. WIRING DIAGRAM .......................................... 13
9. ACTUATOR CONTROL ................................... 15
10. SERVICE FUNCTIONS .................................... 16
11. TROUBLESHOOTING ..................................... 16
12. DISASSEMBLY INSTRUCTIONS .................... 32
PARTS CATALOG (OCB706)
December 2018
No.OCH706
HFC
utilized
R32

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2018 No.OCH706 utilized TECHNICAL & SERVICE MANUAL Outdoor unit [Model Name] [Service Ref.] Note: SUZ-SM71VA.TH • This service manual describes technical data of the outdoor SUZ-SM71VA units only. 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 Model Name Service Ref. Service Manual No. OCH683 PLA-SM71EA PLA-SM71EA.UK OCB683 HWE17010 PEAD-SM71JA(L) PEAD-SM71JA(L) .UK BWE017160 SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING Read the OPERATION MANUAL carefully before operation.
  • 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.
  • Page 5 [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.

  • Page 10: Parts Names And Functions

    Drain outlet PARTS NAMES AND FUNCTIONS SUZ-SM71VA.TH Air inlet Model SUZ-SM·VA(2) (back and side) Drain socket Piping Drain hose Air outlet Drain outlet SPECIFICATION NOTE: Test conditions are based on ISO 5151 Outdoor model SUZ-SM71VA.TH Cooling : Indoor D.B. 27°C W.B.

  • Page 11: Noise Criteria Curves

    Specifications and rating conditions of main electric parts SUZ-SM71VA.TH Model SUZ-SM71VA.TH Item (C61) — Smoothing (C62, C63) — capacitor (CB1, 2, 3) 560 μF 450 V (DB61) — Diode module (DB65) — (F61) — Fuse (F62) — (F601, F880, F901) T3.15 A L250 V (IC700) 20 A 600 V Power module...

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SUZ-SM71VA.TH Unit: mm REQUIRED SPACE Basically, leave this space open. Only if front and both sides are open, leave 500 mm at minimum. 417.5 Air in 100 mm or more Air in Air out 2-Oval holes 10 21 500 mm or more.

  • Page 13: Wiring Diagram

    WIRING DIAGRAM SUZ-SM71VA.TH OCH706...

  • Page 14: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SUZ-SM71VA.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 15: Actuator Control

    ACTUATOR CONTROL SUZ-SM71VA.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. 5 seconds 15 seconds Compressor...

  • Page 16: Service Functions

    SERVICE FUNCTIONS 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 "10-6. Test point diagram and voltage".) Defrost finish temperature (°C) Jumper wire SUZ-SM71VA.TH Soldered (Initial setting) None (cut)
  • Page 17 11-2. TROUBLESHOOTING CHECK TABLE Abnormal point/ check Symptoms Condition Remedy Condition indication code Outdoor unit 1-time blink Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- within 1 minute after the compressor gets started. sor.
  • Page 18 11-3. HOW TO PROCEED "SELF-DIAGNOSIS" As this air conditioner has a function to memorize all the failures that had occurred, 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 19 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 20 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 21 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 22 11-3-5. Self-diagnosis <Wireless remote controller> <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] 1.
  • Page 23 • 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 Approx. 2.5 s 0.5 s 0.5 s 0.5 s Approx.
  • Page 24 11-4. TROUBLE CRITERION OF MAIN PARTS SUZ-SM71VA.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” for the chart of thermistor. thermistor (RT65) Outdoor heat exchanger temperature thermistor(RT68)
  • Page 25 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 26 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> Measure the resistance between the lead wires at 3 points. BK-WH BK-RD WH-RD <Judgement> Refer to "11-4. TROUBLE CRITERION OF MAIN PARTS". 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
  • Page 27 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 CN602 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 28 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.
  • Page 29 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 30 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 31 11-6. TEST POINT DIAGRAM AND VOLTAGE Inverter P.C. board SUZ-SM71VA.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...

  • Page 32: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.
  • Page 33 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screws of the relay panel board Inverter P.C 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 34 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 35 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 36 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. OCH706 Made in Japan...

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