INDOOR UNIT No. OBH501 SERVICE MANUAL Wireless type Models MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Outdoor unit service manual MUZ-D•NA Series (OBH502) MUY-D•NA Series (OBH502) CONTENTS 1. TECHNICAL CHANGES······································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3. SPECIFICATION ················································ 5 4. OUTLINES AND DIMENSIONS ························ 7 5. WIRING DIAGRAM············································ 8 6.
1 TECHNICAL CHANGES MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA 1.
2 PART NAMES AND FUNCTIONS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Air cleaning filter (Anti-Allergy Enzyme Filter) Front panel Air filter (Catechin air filter) Air inlet Emergency operation switch Air outlet Operation indicator lamp Remote control receiving section Horizontal vane ACCESSORIES Installation plate Installation plate screw 4 × 25 mm Remote controller holder Screw for × 3.5 × 1.
3 SPECIFICATION Model External finish Power supply V, phase, Hz Max. fuse size (time delay)/ Disconnect switch A Min. circuit ampacity A Fan motor F.L.A HEAT Dry CFM Airflow COOL Dry Low-Med.-High CFM (Wet) Moisture removal pt./h Cooling dB(A) Sound level Low-Med.-High Heating dB(A) Cond. drain connection O.D. in. W in. Dimensions D in. H in. Weight Ib. Remote controller Control voltage (by built-in transformer) MSZ-D30NA MSY-D30NA MSZ-D36NA White 208 / 230 , 1 , 60 15 1.0 0.
3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage 208/230 V 1 phase 60 Hz Indoor unit Guaranteed Voltage Min.187 V 208 V 230 V Max.253 V (2) OPERATION Intake air temperature (°F) Mode Condition Indoor Standard temperature Maximum temperature Cooling Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature Minimum temperature Outdoor DB 80 90 67 WB 67 73 57 DB 95 115 14 60 67 60 47 75 14 78 % WB — — — — 70 80 70 43 65 13 3-2.
OUTLINES AND DIMENSIONS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Unit : inch Indoor unit 2-11/16 4-11/16 7/8 4 11-5/8 17-11/16 Wall hole ø3 1/4 Air in 46-1/16 5-3/8 1/8 20-7/8 2-3/16 Installation plate 9-1/2 2-5/8 Air out 5-7/8 3/4 14-3/8 Liquid line Gas line Wireless remote controller Joint Drain hose Piping ø3/8 19-11/16 (Flared connection ø3/8) ø5/8 16-7/8 (Joint connection ø5/8) ø5/8 (Flared connection ø5/8) Inslation ø1-1/8 Connected part ø9/16 O.D Insulation ø1-1/4 O.
5 WIRING DIAGRAM MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA 8
6 REFRIGERANT SYSTEM DIAGRAM MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Unit:inch Refrigerant pipe ø5/8 (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT13(sub) Indoor coil thermistor RT12(main) Flared connection Joint Joint connection Distributor Room temperature thermistor RT11 Flared connection Strainer Refrigerant pipe ø3/8 (with heat insulator) 9 Refrigerant flow in cooling Refrigerant flow in heating
7 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.) Set time : 1-minute 1-second Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit-of JPG and JPS.) 7-2. P.C.
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. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically. Operation If the main power has been cut, the operation settings remain. After the power is restored, the unit restarts automatically according to the memory.
8 MICROPROCESSOR CONTROL MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA WIRELESS REMOTE CONTROLLER + These pictures show MSZ type.
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). 1. Coil frost prevention When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
(4) The initial set temperature is decided by the initial room temperature.
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 (approx. 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button. (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper.
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 (approx. 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button. 1 2 3 4 SWING 5 6 (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
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. (b) Press the TIME SET buttons ( ) to set the current time.
8-9. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down. The unit will start and OPERATION INDICATOR lamp will light. The first 30 minutes of operation is the test run operation. This operation is for servicing.
9 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 confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
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 doesn't recur. 1.
2. Indoor unit failure mode table Left lamp of OPAbnormal point ERATION INDICA(Failure mode) TOR lamp Not lighted Normal Condition Correspondence — The room temperature thermistor short or open 1-time flash every Room temperature circuit is detected every 8 seconds during op0.5-second thermistor eration. 2-time flash Indoor coil thermis- The indoor coil thermistor short or open circuit 2.5-second OFF tor is detected every 8 seconds during operation.
9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates only in Test Run operation. Indoor unit operates. Outdoor unit doesn't operate normally. Outdoor unit doesn't operate even in Test Run operation. Unit doesn't operate normal operation in COOL or HEAT mode. Indoor unit doesn't receive the signal from remote controller. Indoor unit operates, when EMERGENCY OPERATION switch is pressed.
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 the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing. Lighted OPERATION INDICATOR No.
9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Part name Room temperature thermistor(RT11) Check method and criterion Measure the resistance with a tester. Indoor fan motor(MF) Check 9-6. . Figure Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C. board", the chart of thermistor. Indoor coil thermistor (RT12(MAIN), RT13(SUB)) Measure the resistance between the terminals with a tester.
9-6. TROUBLESHOOTING FLOW OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN211. Is there any foreign matter that interferes the rotation of the line flow fan? Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. 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 visible? Yes No (not clear) Replace the batteries. (Refer to 9-1.4.) Remove the batteries, then set them back and press RESET button. (Refer to 9-1.4.
The unit does not operate with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply.
• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • OPERATION INDICATOR lamp flashes ON and OFF every 0.5-second. Outdoor unit does not operate. D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage AC in the power supply? Check the power supply. No Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring.
E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. No Yes Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.? Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
9-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Indoor electronic control P.C. board Varistor (NR11) Power supply input 208 / 230 VAC } Cement resistor (R111) Fuse (F11) 250 V 3.15 A Indoor fan motor (CN211) Release of Auto restart function Solder the Jumper wire JR07 (Refer to 7-3.) 294 / 325 VDC (-) Fiducial terminal of cathode side on measuring high-voltage DC 15 VDC (+)3-6 VDC (+)0 VDC or 15 VDC 5 VDC Power monitor receiver P.C.
10 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. (1) Slide the sleeve and check if there is a locking lever or not.
OPERATING PROCEDURE PHOTOS 3. Removing the nozzle assembly (1) Remove the panel and the corner box. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the electrical side cover, disconnect the vane motor connector. (4) Pull out the drain hose from the nozzle assembly, and remove the nozzle assembly. Photo 3 4. Removing the vertical vane motor (1) Remove the nozzle assembly. (Refer to 3.) (2) Remove the crank of the vertical vane motor unit from the vertical vane.
OPERATING PROCEDURE PHOTOS 6. Removing the line flow fan and the indoor fan motor (1) Remove the panel and the corner box. (Refer to 1.) (2) Remove the electrical box. (Refer to 2.) (3) Remove the nozzle assembly. (Refer to 3.) (4) Remove the water cover. (5) Loosen the screw of the line flow fan. (6) Remove the screws of the motor bed. (7) Remove the lead wire of the indoor coil thermistor from the hooks of the motor bed. (8) Remove the motor band and the motor bed together with indoor fan motor.
TM HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Feb. 2008. No. OBH501 7 Made in Japan New publication, effective Feb. 2008 Specifications subject to change without notice.