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Mitsubishi Electric M Series Service Manual

Multi-position air handler. indoor unit
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Air-Conditioners
SERVICE MANUAL
Series MVZ
Model name
Model name
<Indoor unit>
<Indoor unit>
MVZ-A12, 18, 24, 30, 36AA7
MVZ-A12AA4
MVZ-A18AA4
Multi-Position Air Handler
MVZ-A24AA4
INDOOR UNIT
M-SERIES

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  Summary of Contents for Mitsubishi Electric M Series

  • Page 1 M-SERIES Air-Conditioners SERVICE MANUAL Series MVZ Model name Model name <Indoor unit> <Indoor unit> MVZ-A12, 18, 24, 30, 36AA7 MVZ-A12AA4 MVZ-A18AA4 Multi-Position Air Handler MVZ-A24AA4 INDOOR UNIT...
  • Page 3: Table Of Contents

    Contents 1. SAFETY PRECAUTION ..............................2 1-1. Always observe for safety ............................2 1-2. Cautions related to new refrigerant ........................... 2 2. PART NAMES AND FUNCTIONS ............................3 3. SPECIFICATION ................................4 4. FAN PERFORMANCE AND CORRECTED AIR FLOW ..................... 6 MVZ-A12AA7 ...................................
  • Page 4: Safety Precaution

    When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) © 2016 Mitsubishi Electric US, Inc.
  • Page 5: Part Names And Functions

    · Attach on vacuum pump. Refrigerant charge base Refrigerant cylinder · Only for R410A · Top of cylinder (Pink) · Cylinder with syphon Refrigerant recovery equipment PART NAMES AND FUNCTIONS Indoor Unit • (1)Vertical (2)Horizontal Right inlet outlet © 2016 Mitsubishi Electric US, Inc.
  • Page 6: Specification

    125Pa (0.50 in.WG) 28-32-36 dB (A) 33-37-41 200Pa (0.80 in.WG) Drain pipe mm (in.) 19.05 (3/4) FPT Dimensions mm (in.) 432 (17) mm (in.) 548 (21-5/8) mm (in.) 1275 (50-1/4) Weight kg (lbs) 51 (113) © 2016 Mitsubishi Electric US, Inc.
  • Page 7 125Pa (0.50 in.WG) dB (A) 200Pa (0.80 in.WG) 37-41-45 Drain pipe mm (in.) 19.05 (3/4) FPT Dimensions mm (in.) 534 (21) mm (in.) 548 (21-5/8) mm (in.) 1378 (54-1/4) kg (lbs) Weight 64 (141) © 2016 Mitsubishi Electric US, Inc.
  • Page 8: Fan Performance And Corrected Air Flow

    External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz [0.90] [0.90] High [0.80] [0.80] High [0.70] [0.70] [0.60] [0.60] Middle Middle [0.50] [0.50] [0.40] [0.40] [0.30] [0.30] [247] [353] [494] [247] [353] [494] Airflow rate (m /min)[cfm] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 9: Mvz-A18Aa7

    External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz [0.90] [0.90] [0.80] [0.80] High High [0.70] [0.70] [0.60] [0.60] Middle Middle [0.50] [0.50] [0.40] [0.40] [0.30] [0.30] [353] [530] [706] [353] [530] [706] Airflow rate (m /min)[cfm] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 10: Mvz-A24Aa7

    [0.90] [0.90] High High [0.80] [0.80] [0.70] [0.70] [0.60] [0.60] Middle Middle [0.50] [0.50] [0.40] [0.40] [0.30] [0.30] [459] [530] [706] [777] [459] [530] [706] [777] Airflow rate (m /min)[cfm] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 11: Mvz-A30Aa7

    [0.90] [0.90] High [0.80] High [0.80] [0.70] [0.70] [0.60] [0.60] Middle Middle [0.50] [0.50] [0.40] [0.40] [0.30] [0.30] [530] [706] [883] [1024] [530] [706] [883] [953] Airflow rate (m /min)[cfm] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 12: Mvz-A36Aa7

    High [0.80] [0.70] High [0.70] [0.60] [0.60] [0.50] Middle Middle [0.50] [0.40] [0.40] [0.30] [0.30] [0.20] [671] [706] [883] [1059] [1130] [671] [706] [883] [1059] [1130] Airflow rate (m /min)[cfm] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 13: Mvz-A12, 18, 24, 30, 36Aa7

    MVZ-A12, 18, 24, 30, 36AA4 MVZ-A12, 18, 24, 30, 36AA7 Air filter Power source:208/230V 60Hz [0.100] [0.080] A30,36 A30,36 [0.060] A12,18,24 A12,18,24 [0.040] [0.020] [353] [706] [1059] [1412] [1766] Airflow rate (m /min)[cfm] © 2016 Mitsubishi Electric US, Inc.
  • Page 14: Sound Pressure Levels

    SOUND PRESSURE LEVELS 5-1. Sound pressure level Multi-Position 5-2. NC curves MVZ-A12AA7 MVZ-A18AA7 © 2016 Mitsubishi Electric US, Inc.
  • Page 15 MVZ-A24AA7 MVZ-A30AA7 © 2016 Mitsubishi Electric US, Inc.
  • Page 16 MVZ-A36AA7 © 2016 Mitsubishi Electric US, Inc.
  • Page 17: Outlines & Dimensions

    OUTLINES & DIMENSIONS INDOOR UNIT MVZ-A12, 18, 24, 30, 36AA7 © 2016 Mitsubishi Electric US, Inc.
  • Page 18 609.6(24) 609.6(24) © 2016 Mitsubishi Electric US, Inc.
  • Page 19: Wiring Diagram

    /EVA TEMP THERMISTOR CONNECTOR (HUMIDITY INPUT) TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) LED(POWER SUPPLY) LED1 LED(REMOTE CONTROLLER SUPPLY) LED2 TERMINAL BLOCK TB15 (REMOTE CONTROLLER TRANSMISSION LINE) LED(TRANSMISSION INDOOR-OUTDOOR) LED3 RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT © 2016 Mitsubishi Electric US, Inc.
  • Page 20: Refrigerant System Diagram

    Refrigerant GAS pipe connection (Flare) Thermistor TH5 (Cond./ Eva.temperature) Refrigerant flow in cooling Refrigerant flow in heating Thermistor TH2 Pipe temperature(Liquid) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature) Strainer (#50) Distributor with strainer (#50) © 2016 Mitsubishi Electric US, Inc.
  • Page 21: Heater Control

    • EH1: Electric Heater 1 • EH2: Electric Heater 2 • To: Set point temperature • T RA : Return Air temperature • X: Time delay (Selectable. Default is 24 min. Selectable to 14, 19, or 29 min) © 2016 Mitsubishi Electric US, Inc.
  • Page 22 (To -T RA ) > 2.7 °F [1.5 °C] T RA not increasing faster than 0.9 °F [0.5°C] in 7 min EH2 ON EH1 OFF (To -T ) < 0.9 °F [0.5°C] EH2 OFF © 2016 Mitsubishi Electric US, Inc.
  • Page 23: Fan Control

    Mode No. Setting Initial Setting Heating Thermo-OFF DEFROST or ERROR Very Low Very Low Fan Control STOP Remote Controller Setting Remote Controller Setting Remote Controller Setting *3 Refer to the Installation Manual for function settings. © 2016 Mitsubishi Electric US, Inc.
  • Page 24: Cn24Relay-Kit-Cm3 (Optional Parts) Installation

    2) Panel heater connector This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit control board specification, connect the cable to CN4Y as appropriate. CN4Y for FAN control (CN24RELAY-KIT-CM3) © 2016 Mitsubishi Electric US, Inc.
  • Page 25 Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft). Longer than 10 meters (32ft) could cause improper operation. Use a transit relay when extending wiring such as remote wiring. © 2016 Mitsubishi Electric US, Inc.
  • Page 26: Humidifier Control

    On-site preparation Use XA relay having following specifications Maximum cable length is 10m(32ft) Rated voltage:12VDC Power consumption:1W or less Humidistat:Minimum applicable load 1mA at DC Contact rating voltage:15VDC or more Contact rating current:0.1A or more © 2016 Mitsubishi Electric US, Inc.
  • Page 27: Erv (Energy Recovery Ventilation) Control

    Use XB relay having following specifications Maximum cable length is 10m(32ft) Rated voltage:12VDC Power consumption:1W or less ERV switch:Minimum applicable load 1mA at DC Contact rating voltage:15VDC or more Contact rating current:0.1A or more © 2016 Mitsubishi Electric US, Inc.
  • Page 28: Troubleshooting

    2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the components. 3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wires © 2016 Mitsubishi Electric US, Inc.
  • Page 29: Self-Check Function

    • No signals from the remote controller are accepted. • OPE lamp is blinking. • The buzzer makes a short ping sound. Note: Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation) © 2016 Mitsubishi Electric US, Inc.
  • Page 30 The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically. Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1). © 2016 Mitsubishi Electric US, Inc.
  • Page 31: Self-Diagnosis Action Table

    (3 and 4 of connector CN4F is not inserting connector again. short-circuited.) 2 Defective indoor controller 2 Operate with connector (CN4F) short-circuit- 2 Constantly detected during operation. board Refer to 12-5. Replace indoor controller board if abnormality reappears. (5701) © 2016 Mitsubishi Electric US, Inc.
  • Page 32 20 minutes. Note 3) It takes at least 27 minutes to detect abnormality. Note 4) It excludes the period of defrosting (Detection restarts when defrosting mode is over) Heating range : (TH5-TH1) © 2016 Mitsubishi Electric US, Inc.
  • Page 33 “RC E3”or “ERC 00-66”is displayed, different data to be abnormal 30 noise may be causing abnormality. continuous times. (Error code: E5) © 2016 Mitsubishi Electric US, Inc.
  • Page 34 1 Abnormal if data cannot be read normal- ly from the nonvolatile memory of the remote controller control board. (Error code: E1) 2 Abnormal if the clock function of remote controller cannot be operated normally. (Error code: E2) © 2016 Mitsubishi Electric US, Inc.
  • Page 35: Troubleshooting By Inferior Phenomena

    • When LED2 is lit, connect remote controller wires again and: if LED2 is blinking, remote controller is defective; if LED2 is lit, connection failure of remote controller terminal block etc. has returned to normal. © 2016 Mitsubishi Electric US, Inc.
  • Page 36: Test Point Diagram

    Voltage between the C53 pins 0VDC (with the fan stopped) 1 - 6.5VDC (with the fan in operation) (Same with the voltage between 6 (+) and 4 (-) of CNMF) CNXB1 CNXC1 CNXA1 CNMF (*1) PC51 (*1) (*1) © 2016 Mitsubishi Electric US, Inc.
  • Page 37 Connect to the indoor controller board CNXA1 Connect to the indoor power board CNXB1 Connect to the indoor power board CNXC1 Connect to the indoor power board CNER ERV controll CN2C ERV input CN25 Humidity conrol Humidity input © 2016 Mitsubishi Electric US, Inc.
  • Page 38: Trouble Criterion Of Main Parts

    20°C (68°F) 6.3 k" 25°C (77°F) 5.2 k" (˚C) -20 -10 0 10 20 30 40 50 30°C (86°F) 4.3 k" ˚F -4 14 32 50 68 86 104 122 40°C (104°F) 3.0 k" Temperature © 2016 Mitsubishi Electric US, Inc.
  • Page 39: Dc Fan Motor (Fan Motor/Indoor Controller Board)

    1 - pin 4 O.L. pin 5 - pin 4 pin 6 - pin 4 150k pin 7 - pin 4 O.L. *To measure the resistance, connect the negative (-) end of the tester to pin 4. © 2016 Mitsubishi Electric US, Inc.
  • Page 40: Functions Of Dip Switch And Jumper Wire

    There is no jumper (JP1) because these models Unit type Without TH5 have the cond./eva. temperature thermistor (TH5). setting With TH5 Indoor Indoor controller board type controller Factory shipment board type Service parts setting © 2016 Mitsubishi Electric US, Inc.
  • Page 41: Disassembly Procedure

    DISASSEMBLY PROCEDURE 13-1. Control box Exercise caution when removing heavy parts. 1. Remove the Electric panel (2 screws) Fig. 1 © 2016 Mitsubishi Electric US, Inc.
  • Page 42: Thermistor (Return Air)

    2. Remove the Blower panel (2 screws). Fig. 3 3. Remove the cover over the Return Air thermistor box and unplug the thermistor. 4. Pull out the thermistor holder and thermistor inside the box. Fig. 4 © 2016 Mitsubishi Electric US, Inc.
  • Page 43: Coil Assembly

    Next, slide the coil from the frame. Fig. 7 Fig. 8 © 2016 Mitsubishi Electric US, Inc.
  • Page 44 5. Remove the plate covering the coil assembly to access the thermistors. Fig. 9 6. Remove lower and side drain pan. Fig. 10 © 2016 Mitsubishi Electric US, Inc.
  • Page 45: Blower/Fan Assembly

    3. Remove the door that covers the small enclosure attached to the fan assembly (Fig.12). Unplug the motor and route the wire harness out of the enclosure. 4. Remove the (2) screws that secure the fan assembly and slide out. Fig. 12 © 2016 Mitsubishi Electric US, Inc.
  • Page 46 Please be sure to put the contact address/telephone number on this manual before handing it to the customer. MITSUBISHI ELECTRIC US, INC. www.mitsubishielectric-usa.com Toll Free: 800-433-4822 MEUS DOC# MD-1404-K009, December 2016 © 2016 Mitsubishi Electric US, Inc.