Mitsubishi Electric MSZ-D30NA Service Manual
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Mitsubishi Electric MSZ-D30NA Service Manual

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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS ·····················7
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS ······························ 10
8. MICROPROCESSOR CONTROL ················· 12
9. TROUBLESHOOTING ······························· 19
10. DISASSEMBLY INSTRUCTIONS ················· 32
PARTS CATALOG (OBB501)
Revision D:
• 9-7. TEST POINT DIAGRAM AND
VOLTAGE has been modified.
OBH501 REVISED EDITION-C is void.
No. OBH501
REVISED EDITION-D
-
8
-
8
-
8
-
8
Outdoor unit service manual
MUZ-D•NA Series (OBH502)
MUY-D•NA Series (OBH502)

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Summary of Contents for Mitsubishi Electric MSZ-D30NA

  • Page 1: Table Of Contents

    Revision D: • 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified. OBH501 REVISED EDITION-C is void. INDOOR UNIT No. OBH501 REVISED EDITION-D SERVICE MANUAL Models MSZ-D30NA MSZ-D30NA MSZ-D36NA MSZ-D36NA MSY-D30NA MSY-D30NA MSY-D36NA MSY-D36NA Outdoor unit service manual MUZ-D•NA Series (OBH502) MUY-D•NA Series (OBH502)
  • Page 2 Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA 1. New model MSZ-D30NA MSZ-D36NA - 1. Electronic control P.C. board has been changed. MSZ-D36NA MSZ-D36NA - 1. Electronic control P.C. board has been changed. MSY-D30NA MSY-D30NA - 1. Electronic control P.C. board has been changed.

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Air cleaning fi lter (Anti-Allergy Enzyme Filter) Front panel Air fi lter (Catechin air fi lter) Air inlet Emergency operation switch Air outlet Operation indicator Horizontal vane lamp Remote controller Remote control...

  • Page 5: Specification

    SPECIFICATION Model MSZ-D30NA MSY-D30NA MSZ-D36NA MSY-D36NA Power supply V, phase, Hz 208/230 , 1 , 60 Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.76 COOL Dry 389 - 639 - 848 - 887 Airflow...
  • Page 6 Model Mode Function to the position where the air speed is 1 (CFM) (ft./sec.) range (ft.) ft./sec., when air is blown out horizon- MSZ-D30NA HEAT 23.6 45.0 tally from the unit properly at the High MSZ-D36NA speed position. MSZ-D30NA 23.6 45.0...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Unit : inch Indoor unit 2-11/16 4-11/16 45-1/2 20-7/8 17-11/16 5-3/8 2-3/16 11-5/8 Wall hole ø3 Air in 46-1/16 Installation plate Piping Drain hose 2-15/16 33-11/16 9-1/2 2-5/8 Air out 5-7/8 Piping Insulation...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA MSZ-D30NA- MSZ-D36NA- MSY-D30NA- MSY-D36NA- OBH501D...

  • Page 9: Refrigerant System Diagram

    RT12 (Main) Flared connection Indoor coil Distributor Joint thermistor Joint connection RT13 (Sub) Room temperature thermistor RT11 Flared connection Strainer Refrigerant pipe ø3/8 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating (MSZ-D30NA MSZ-D36NA only) OBH501D...

  • Page 10: Service Functions

    SERVICE FUNCTIONS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.)
  • Page 11 7-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shut-off of the main power.

  • Page 12: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA WIRELESS REMOTE CONTROLLER * These pictures show MSZ type. Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button VANE CONTROL button FAN SPEED (Horizontal vane button) CONTROL button Temperature buttons OPERATION SELECT button OFF TIMER button...
  • Page 13 8-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F (16 ~ 31°C).
  • Page 14 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 79°F (26°C) or more 75°F (24°C) COOL mode of "I FEEL CONTROL" 77°F (25°C) to 79°F (26°C) Initial room temperature minus 4°F (2°C) DRY mode of "I FEEL More than 55°F (13°C), Initial room temperature minus 4°F (2°C)
  • Page 15 8-7. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
  • Page 16 2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button. SWING (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper.
  • Page 17 8-8. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. How to set the current time (a) Press the CLOCK set button.
  • Page 18 8-9. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use the emergency operation switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down.

  • Page 19: Troubleshooting

    TROUBLESHOOTING MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA 9-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 20 9-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
  • Page 21 2. Table of indoor unit failure mode recall function Left lamp of Abnormal point OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit Normal — — The room temperature thermistor short or open 1-time blink every Room temperature Refer to the characteristics of the room temperature circuit is detected every 8 seconds during 0.5-second thermistor...
  • Page 22 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit operates. Indoor unit does not OPERATION INDICATOR lamp on the indoor unit is Outdoor unit does not Outdoor unit does not receive the signal from blinking on and off. operate. operate normally.
  • Page 23 9-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks. OPERATION INDICATOR Blinking Not lit...
  • Page 24 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Part name Check method and criterion Figure Room temperature Measure the resistance with a multimeter. thermistor (RT11) Indoor coil thermistor Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control (RT12 (MAIN), RT13 P.C.
  • Page 25 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch.
  • Page 26 B Check of remote controller and receiver P.C. board * Check if the remote controller is exclusive for this air conditioner. Switch ON the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 9-1.4.) visible? (Not clear) Remove the batteries, then set them back and press RESET button.
  • Page 27 C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance between Short circuit: CN211 of the indoor fan motor and vane motor connector CN151 from the Replace the indoor fan motor.
  • Page 28 D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage AC in Check the power supply. the power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 Check the wiring.
  • Page 29 E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft., or is the indoor unit, and/or the antennas and the out- the distance between the antennas and door unit.
  • Page 30 9-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Indoor electronic control P.C. board Power supply input Cement resistor (R111) Varistor (NR11) 230 V AC approximately 4Ω Fuse (F11) Release of Auto restart function T3.15AL250V Solder the Jumper wire to JR07 (Refer to 7-3.)
  • Page 31 MSZ-D30NA- MSZ-D36NA- MSY-D30NA- MSY-D36NA- Indoor electronic control P.C. board Power supply input Cement resistor (R111) Varistor (NR11) 230 V AC approximately 4Ω Fuse (F11) Release of Auto restart function T3.15AL250V Solder the Jumper wire to JR07 (Refer to 7-3.) Indoor fan motor...

  • Page 32: Disassembly Instructions

    Locking lever lever. Connector 10-1. MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. NOTE : Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 33 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 3. Removing the nozzle assembly (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical cover. (Refer to section 2.) (3) Remove the electrical side cover, disconnect the vane Screw of the motor connector.
  • Page 34 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 6. Removing the line flow fan and the indoor fan motor (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical box. (Refer to section 2.) Screw of the motor band (3) Remove the nozzle assembly.
  • Page 35 Fixing the indoor coil thermistor * There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, Clip shape Holder shape the lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
  • Page 36 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2008 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2021. No. OBH501 REVISED EDITION-D Issued: Apr. 2011. No. OBH501 REVISED EDITION-C Issued: Jun. 2008. No. OBH501 REVISED EDITION-B 6 Issued: Mar. 2008. No. OBH501 REVISED EDITION-A 7 Published: Feb.

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