Mitsubishi Electric MSZ-FD25VA Service Manual

Split-type air conditioners

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Operating instructions manual (124 pages)

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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

MSZ-FD25VA -

MSZ-FD25VAS -

MSZ-FD35VA -

MSZ-FD35VAS -

MSZ-FD50VA -

MSZ-FD50VAS -

NOTE:

RoHS compliant products have mark on the spec name plate.

Revision C:

• MSZ-FD•VA(S)-

Please void OBH488 REVISED EDITION-B.

Outdoor unit service manual

MUZ-FD·VA(H) Series (OBH489)

MUZ-FD·VABH Series (OBH519)

MXZ-A·VA Series (OB377)

MXZ-8A140A (OC316)

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVES ······························ 6

5. OUTLINES AND DIMENSIONS ························ 7

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

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

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

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

10. TROUBLESHOOTING ······································20

11. DISASSEMBLY INSTRUCTIONS ·····················36

PARTS CATALOG (OBB488)

has been added.

No. OBH488

REVISED EDITION-C

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi Electric MSZ-FD25VA

Page 1: Table Of Contents
Please void OBH488 REVISED EDITION-B. SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT No. OBH488 SERVICE MANUAL REVISED EDITION-C Models MSZ-FD25VA - MSZ-FD25VAS - MSZ-FD35VA - MSZ-FD35VAS - MSZ-FD50VA - MSZ-FD50VAS - Outdoor unit service manual MUZ-FD·VA(H) Series (OBH489) MUZ-FD·VABH Series (OBH519) MXZ-A·VA Series (OB377)
Page 2 Revision A: • 3. SPECIFICATION has been corrected. • 10-5. TROUBLE CRITERION OF MAIN PARTS has been corrected. Revision B: • MSZ-FD50VA(S)- has been added. Revision C: • MSZ-FD•VA(S)- has been added.
Page 3: Technical Changes
TECHNICAL CHANGES MSZ-FD25VA - MSZ-FD25VAS - MSZ-FD35VA - MSZ-FD35VAS - MSZ-FD50VA - MSZ-FD50VAS - 1. New model MSZ-FD25VA(S) - MSZ-FD25VA(S) - → MSZ-FD35VA(S) - MSZ-FD35VA(S) - → MSZ-FD50VA(S) - MSZ-FD50VA(S) - → 1. Remote controller has been changed. (KM08A → KM09D)
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS AREA lamp POWER lamp CLEAN lamp PLASMA lamp Operation Indicator Remote control receiving section lamp Front panel Air filter Air inlet Remote controller Plasma deodorizing filter Plasma electrode unit Plasma anti-allergy...
Page 5: Specification
SPECIFICATION MSZ-FD25VA MSZ-FD35VA MSZ-FD50VA Indoor model MSZ-FD25VAS MSZ-FD35VAS MSZ-FD50VAS Single phase Power supply 230 V, 50 Hz Cooling Power input Heating Cooling 0.25 0.27 0.53 Running current Heating 0.30 0.32 Model RC0J40-GF Fan motor Cooling 0.25 0.27 Current 0.53 Heating 0.30...
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS FUNCTION SPL(dB(A)) FAN SPEED 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 NC-20 NC-10 NC-10 1000...
Page 7: Outlines And Dimensions
ø7 - 0.5 m (Flared connection ø6.35) 25/35: ø9.52 - 0.43 m (Flared connection ø9.52) Gas line 50: ø9.52 - 0.43 m (Flared connection ø12.7) Drain hose Insulation ø28 O.D Connected part ø16 O.D WIRING DIAGRAM MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS...
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS Unit: mm 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 (with heat insulator)
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.) Set time: 1-minute →...
Page 10 8-3. 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 shutoff of the main power. Operation If the main power has been cut, the operation settings remain.
Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section VANE CONTROL button OPERATE/STOP FAN SPEED CONTROL button (ON/OFF) button OFF TIMER button OPERATION SELECT button ON TIMER button ECONO COOL button TIME SET buttons...
Page 12 9-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. POWER 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 16 ~ 31°C.
Page 13: Heating
NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT: MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit. •When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates first is selected.
Page 14 (7) SWING ( ) mode By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. (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 9-6. i-see CONTROL OPERATION The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti- mating the temperature actually perceived by a person inside the room (“sensible temperature”). Advantages · The air inside the room is conditioned quickly to a comfortable condition. ·...
Page 16 Indoor unit installation location and air-conditioning area Installed at left Installed at center Installed at right LEFT RIGHT LEFT RIGHT LEFT RIGHT • Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit.
Page 17 Operation and operating range i-see sensor moves 30 degrees from the center in both right and left side. i-see Sensor turning to the right i-see Sensor turning to the left i-see Sensor turning to the center i-see Sensor operates as follows in accordance with AREA setting made with the remote controller. “AUTO”...
Page 18 9-9. CLEAN ( ) OPERATION • When CLEAN operation is set, it performs for 40 minutes when unit is stopped after COOL/DRY operation. CLEAN operation performs when: COOL is operated more than 3 minutes / DRY is operated more than 6 minutes. •...
Page 19: Indoor Unit
9-11. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side 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.
Page 20: Troubleshooting
TROUBLESHOOTING MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS 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. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main 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.
Page 21: Indoor Unit
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 22: Indoor Unit
2. Flow chart of PLASMA operation failure mode recall function Operational procedure The plasma electrode unit might be abnormal. Conﬁ rm if outdoor unit is abnormal according to the following procedures. Conﬁ rm that the remote controller is in the failure mode recall function. 1.
Page 23: Indoor Unit
4. Indoor unit failure mode table Abnormal point POWER lamp Condition Correspondence (Failure mode) Not lighted 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- 0.5-second thermistor thermistor (10-7.).
Page 24: Indoor Unit
10-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means If blinking of OPERATION INDI- the operation within 30 minutes CATOR lamp cannot be checked, Start after EMERGENCY OPERA- it can be checked with failure TION switch is pressed. mode recall function. Indoor unit operates.
Page 25: Indoor Unit
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. L AREA R POWER CLEAN PLASMA...
Page 26: Indoor Unit
L AREA R POWER CLEAN PLASMA Abnormal Operation indicator lamp Symptom Condition Correspondence point All lamps ﬂ ash at the same time. Attachment 0.5-second ON Indoor unit and The electricity is not conducted to the inter- • Refer to 10-6. "Check of in- of the hori- outdoor unit do...
Page 27 10-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature ther- mistor (RT11) Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control P.C.
Page 28: 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 29 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) button on the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 10-1.4.) visible? (Not clear) Remove the batteries, then set them back...
Page 30 C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211, vane motor connector CN151 and the i-see Measure the resistance of the i-see Short/open circuit: Sensor motor connector CN110 from the Sensor motor coil.
Page 31: Indoor Unit
D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
Page 32: Indoor Unit
E Check of installation of the horizontal vane Turn OFF the power supply. Re-lock the stopper of the hori- Is the stopper of the horizontal vane Turn ON the zontal vane to the indoor unit. locked to the indoor unit correctly? power supply.
Page 33: Indoor Unit
G 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 34 10-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS 1. Indoor electronic control P.C. board. Cement resistor 5 VDC 12 VDC (R111) Indoor fan motor (CN211) 325 VDC (-) Fiducial terminal of cathode side on measur- ing high-voltage DC...
Page 35 2. Power monitor receiver P.C. board 3. Monitor P.C. board 4. Plasma power P.C. board DC 2.5 V during PLASMA DEODORIZING operation DC 12.5 V during PLASMA DEODORIZING operation...
Page 36: Disassembly Instructions
Locking lever lever. Connector MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (1) Hold both sides of the front panel and lift the front panel until it is level.
Page 37 OPERATING PROCEDURE PHOTOS 2. Removing the electronic control P.C. board, the Photo 2 power monitor receiver P.C. board, i-see Sensor, SW P.C. board and the terminal block (1) Remove the panel (refer to 1.) and the corner box. Screw of the (2) Remove the screw of the V.A.
Page 38 OPERATING PROCEDURE PHOTOS Photo 5 3. Removing the electrical box (1) Remove the panel (refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire, the sen- sor holder, the electrical cover and the earth wire. (Refer to 2.) (3) Disconnect the following connectors on the electronic control P.C.
Page 39 OPERATING PROCEDURE PHOTOS 6. Removing the horizontal vane motor Photo 9 Screws of the horizontal (1) Remove the nozzle assembly. (Refer to 4.) vane motor unit cover (2) Remove the screws of the horizontal vane motor unit, and pull out the horizontal vane motor unit. (3) Remove the screws of the horizontal vane motor unit cover.
Page 40 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2007 MITSUBISHI ELECTRIC CO.,LTD Distributed in Dec. 2008. No. OBH488 REVISED EDITION-C 5 Distributed in Jul. 2008. No. OBH488 REVISED EDITION-B 6 Distributed in Oct. 2007. No. OBH488 REVISED EDITION-A 6 New publication, effective Dec.

This manual is also suitable for:

Msz-fd35va Msz-fd25vas Msz-fd35vas Msz-fd50va Msz-fd50vas