Mitsubishi Electric MSZ-LN25VGW Service Manual

Indoor unit

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INDOOR UNIT

SERVICE MANUAL

Models

MSZ-LN25VGW

MSZ-LN25VGV

MSZ-LN25VGB

MSZ-LN25VGR

MSZ-LN35VGW

MSZ-LN35VGV

MSZ-LN35VGB

MSZ-LN35VGR

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

MSZ-LN50VGW

ER1

MSZ-LN50VGV

ER1

MSZ-LN50VGB

ER1

MSZ-LN50VGR

ER1

MSZ-LN60VGW

ER1

MSZ-LN60VGV

ER1

MSZ-LN60VGB

ER1

MSZ-LN60VGR

ER1

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS ····················· 3

3. SPECIFICATION ················································ 4

4. NOISE CRITERIA CURVE ································ 5

5. OUTLINES AND DIMENSIONS ························ 6

6. WIRING DIAGRAM ············································ 7

7. REFRIGERANT SYSTEM DIAGRAM ··············· 8

8. SERVICE FUNCTIONS ····································· 9

9. MICROPROCESSOR CONTROL ····················11

10. TROUBLESHOOTING ····································· 21

11. DISASSEMBLY INSTRUCTIONS ···················· 38

PARTS CATALOG (OBB766)

No. OBH766

Outdoor unit service manual

MUZ-LN•VG Series (OBH767)

ER1

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi Electric MSZ-LN25VGW

Page 1: Table Of Contents
INDOOR UNIT No. OBH766 SERVICE MANUAL Models MSZ-LN25VGW MSZ-LN50VGW MSZ-LN25VGV MSZ-LN50VGV MSZ-LN25VGB MSZ-LN50VGB MSZ-LN25VGR MSZ-LN50VGR MSZ-LN35VGW MSZ-LN60VGW MSZ-LN35VGV MSZ-LN60VGV MSZ-LN35VGB MSZ-LN60VGB MSZ-LN35VGR MSZ-LN60VGR Outdoor unit service manual MUZ-LN•VG Series (OBH767) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3.
Page 2: Technical Changes
These models may be connected to the MUZ-LN·VG series after once connected to the MXZ series and operated, for exam- ple because of relocation. In that case, the MUZ-LN·VG series outdoor units will not operate without taking a step. Follow the procedure "Deleting the memorized abnormal condition" described in 10-2.1. MSZ-LN25VGW - MSZ-LN25VGV - MSZ-LN25VGB -...
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR Air purifying Air inlet device Front panel Wi-Fi interface i-see sensor Horizontal Air cleaning filter vane (Deodorizing filter, black) Emergency operation...
Page 4: Specification
SPECIFICATION MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV Indoor model MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR Power supply Single phase 230 V, 50 Hz Cooling Power input Heating Cooling 0.21 0.23 0.28 0.37 Running current Heating 0.28 0.33...
Page 5: Noise Criteria Curve
NOISE CRITERIA CURVE MSZ-LN25VGW MSZ-LN25VGB MSZ-LN35VGW MSZ-LN35VGB MSZ-LN25VGV MSZ-LN25VGR MSZ-LN35VGV MSZ-LN35VGR FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20...
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR Unit: mm INSTALLATION PLATE 11×20 OBLONG HOLE 11×26 OBLONG HOLE Ø WALL HOLE INDOOR UNIT INSTALLATION PLATE AIR IN PIPING DRAIN HOSE 38.5...
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-LN25VGW MSZ-LN35VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN60VGR MSZ-LN50VGW MSZ-LN50VGV MSZ-LN50VGB MSZ-LN50VGR OBH766...
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MSZ-LN25VGW MSZ-LN35VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN25VGR MSZ-LN35VGR Refrigerant pipe ø9.52 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6.35...
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
Page 10: Heating
Mitsubishi Electric’s Wi-Fi interface is designed for communication to Mit- subishi Electric’s MELCloud Wi-Fi service. Third party Wi-Fi interfaces cannot be connected to MELCloud. Mitsubishi Electric is not responsible for any (i) under performance of a sys- (1) MODE switch tem or any product;...
Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 6 m Beep(s) is (are) heard from the indoor unit when the signal is received.
Page 12 9-1. COOL ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) 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 TEMP button to select the desired temperature. The setting range is 16 - 31°C. 1.
Page 13: Heating
NOTE 1: If 2 or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in (AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby. Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.
Page 14 (7) SWING ( ) mode By selecting SWING mode with VANE CONTROL button, the horizontal vanes swing vertically. When COOL, DRY or FAN mode is selected, only the upper vane swings. (8) Cold air prevention in HEAT operation The horizontal vane position is set to Upward. NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control does not work in the indoor unit.
Page 15 9-7. 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 button. How to set the current time (a) Press the CLOCK button.
Page 16: Weekly Timer Operation
9-8. WEEKLY TIMER OPERATION • A maximum of 4 ON or OFF timers can be set for individual days of the week. • A maximum of 28 ON or OFF timers can be set for a week. NOTE: The simple ON/OFF timer setting is available while the weekly timer is on. In this case, the ON/OFF timer has priority over the •...
Page 17 (4) Press button to complete and transmit the weekly timer setting. which was blink- ing goes out, and the current time will be displayed. NOTE: • Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the indoor unit for 3 seconds.
Page 18 ABSENCE DETECTION ( ) This function automatically changes the operation to No occupancy energy-saving mode or No occupancy Auto-OFF mode when nobody is in the room. (1) To activate this No occupancy energy-saving mode, press SENSOR button until appears on the operation display of the remote controller.
Page 19 9-11. NIGHT MODE ( ) OPERATION NIGHT MODE changed the brightness of the operation indicator, disables the beep sound and limits the noise level of the outdoor unit. (1) Press NIGHT MODE button during operation to activate NIGHT mode ( ). •...
Page 20 9-14. OPERATION LOCK This function locks operation mode only. Other functions, such as OFF/ON, temperature setting, or airflow direction adjustment, are available. (1) Hold down button and button simultaneously for 2 seconds while the unit is not operating to enable OPERATION LOCK.
Page 21: Troubleshooting
TROUBLESHOOTING MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring.
Page 22 10-2. 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 (10-4.) disappears, the memorized failure details can be recalled. 1.
Page 23 2. Flow chart of AIR PURIFYING power failure mode and i-see SENSOR failure mode recall function Operational procedure The air purifying device or i-see SENSOR might be abnormal. Check if the air purifying device or i-see SENSOR is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function.
Page 24 4. Table of indoor unit failure mode recall function (When recalled at a set temperature of 24°C) Abnormal point POWER lamp Condition Remedy (Failure mode) Not lit Normal — — The room temperature thermistor short or 1-time ﬂ ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur-...
Page 25 10-3. INSTRUCTION OF TROUBLESHOOTING 1.Check of the unit. *1. "Test Run operation" means the opera- If blinking of OPERATION INDICA- Start TOR lamp cannot be checked, it can tion within 30 minutes after EMERGENCY be checked with failure mode recall OPERATION switch is pressed.
Page 26 2. Check of Wi-Fi interface Follow the procedure below if the air conditioner cannot be monitored or controlled with a device such as a smartphone. Start There is a problem in communication between the air conditioner Is the UNIT lamp on the Wi-Fi interface blinking? and the Wi-Fi interface.
Page 27 10-4. 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 flashes. •...
Page 28 OFF even if the AIR PURIFYING power PURIFYING power". not operate. operation is turned OFF by remote controller. control 10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB...
Page 29: Troubleshooting Flow
10-6. 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 EMERGENCY OPERATION switch.
Page 30 B Check of remote controller and indoor electronic control P.C. board NOTE: Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) button on the remote controller. 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone.
Page 31 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
Page 32 D How to check miswiring and serial signal error Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored in the indoor unit.
Page 33 MXZ Type Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the indoor POWER lamp light up? <Conﬁ...
Page 34 Turn ON the power supply. LED indication for communication status Communication status is indicated by the LED. Does the LED on the outdoor control P.C. Unit status Replace the outdoor control P.C. board. board repeat "3.6-second-OFF Blinking: normal communication (Lit and 0.8-second-ON quick blinking"? Lit: abnormal communication or...
Page 35 E Check of AIR PURIFYING power After performing the check, make sure to release the failure mode recall function. High voltage (approximately 5.8kV) is generated during AIR PURIFYING power operation. Turn ON the power supply. Pay careful attention and never touch the air purifying device and the high-voltage lead part.
Page 36 F 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 37 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor power P.C. board, Indoor electronic control P.C. board, Display and receiver P.C. board, Switch buzzer P.C. board MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR MSZ-LN50VGR MSZ-LN60VGR Connector Terminal Indoor power P.C.
Page 38: Disassembly Instructions
Sleeve Slide the sleeve. Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSZ-LN25VGW MSZ-LN35VGW MSZ-LN50VGW MSZ-LN60VGW MSZ-LN25VGV MSZ-LN35VGV MSZ-LN50VGV MSZ-LN60VGV MSZ-LN25VGB MSZ-LN35VGB MSZ-LN50VGB MSZ-LN60VGB MSZ-LN25VGR MSZ-LN35VGR...
Page 39 OPERATING PROCEDURE PHOTOS How to install the front panel (Photos 1, 2, 3) (1) Attach the right and left arm holders (Photo 2). Figure 2 (2) Install the front panel to the indoor unit. (3) Attach the safety string to the center of the panel (F).
Page 40 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the Wi-Fi interface (Photos 4, 8) Wi-Fi (1) Remove the front panel and the panels (U) (R) (L). interface Lead wires of (2) Remove the Wi-Fi interface on the right side of the the air puriﬁ...
Page 41 OPERATING PROCEDURE PHOTOS 3. Removing the indoor electrical box Photo 5 (Photos 4, 5, 6, 7, 8) (1) Remove the front panel, the outer vanes (R) (L) (hori- zontal), and the panels (U) (R) (L) (F) (refer to 1). (2) Remove the lead wires of indoor coil thermistor, lead wires of air purifying device, and cable of Wi-Fi inter- face from the water cover (Photo 4).
Page 42 OPERATING PROCEDURE PHOTOS 4. Removing the indoor electronic control P.C. Photo 8 (Enlarged view of the indoor board, the indoor power P.C. board, the indoor electronic control P.C.bard) terminal block, and the room temperature ther- mistor CN201 TAB3 CN211 CN202 (1) Remove the electrical box (refer to 3).
Page 43 OPERATING PROCEDURE PHOTOS 5. Removing the DISPLAY AND i-see SENSOR ASSEMBLY, the switch buzzer P.C. board, the display and receiver P.C. board, and the inter- lock switch (Photo 9) (1) Disengage the 4 catches of the display cover, and remove the display cover (Photo 9-1). (2) Remove the lead wires of the DISPLAY AND i-see SENSOR ASSEMBLY from the hooks (Photo 9-2).
Page 44 OPERATING PROCEDURE PHOTOS 6. Removing the outer vane motors Photo 10 (horizontal) (Photos 8, 10, 11, 12, 13) (1) Remove the front panel, the outer vanes (R) (L)(hori- zontal), the panels (U) (R) (L) (F), the corner boxes (R) (L), Wi-Fi interface, DISPLAY and i-see SENSOR ASSEMBLY, V.A.
Page 45 OPERATING PROCEDURE PHOTOS 7. Removing the vane motor units (L) (R) (vertical) Photo 14 and the vane motors (horizontal) Screws of the vane motor (1) Remove the front panel, the outer vanes (R) (L) (horizontal) on back side (horizontal), the inner vanes (R) (L), the vane slide assembly, the panels (U) (R) (L) (F), the corner boxes Vane motor unit (R) Vane motor (R)
Page 46 OPERATING PROCEDURE PHOTOS 8. Removing the air purifying device (Photo 8, 18) (1) Remove the front panel, the outer vanes (R) (L)(hori- Photo 19 Heat exchanger zontal), the panels (U) (R) (L) (F), the corner box (R), V.A. clamp and the electrical cover. Fan motor (2) Remove the lead wires from the water cover.
Page 47 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, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
Page 48 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2016 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2016. No. OBH766 Specifications are subject to change without notice. Made in Japan...

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Mitsubishi Electric MSZ-LN25VGW Service Manual

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