Mitsubishi Electric MFZ-KA25VA Service Manual

Split-type air conditioners

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Installation manual (144 pages)

Operating instructions manual (112 pages)

Service manual (52 pages)

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SERVICE MANUAL

Models

MFZ-KA25VA

MFZ-KA35VA

NOTE:

• This service manual describes technical data of the indoor units.

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

For servicing of RoHS compliant products, refer to the RoHS Parts List.

MFZ-KA50VA

MFZ-KA25VA

MFZ-KA35VA

MFZ-KA50VA

Revision E:

MFZ-KA25VA-

, MFZ-KA35VA-

MFZ-KA50VA-

have been added.

Please void OB409 REVISED EDITION-D.

Outdoor unit service manual

SUZ-KA•VA(H) Series (OC322)

MXZ-A•VA Series (OB377, OC316)

MXZ-8B•VA Series (OCH480)

MXZ-D•VA Series (OBH626)

CONTENTS

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

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

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

4. NOISE CRITERIA CURVES ······························ 8

5. OUTLINES AND DIMENSIONS ························ 9

6. WIRING DIAGRAM ·········································· 10

7. REFRIGERANT SYSTEM DIAGRAM ··············11

8. PERFORMANCE CURVES ····························· 12

9. SERVICE FUNCTIONS ··································· 23

10. TROUBLESHOOTING ····································· 25

11. DISASSEMBLY INSTRUCTIONS ···················· 39

12. PARTS LIST ····················································· 43

13. RoHS PARTS LIST ·········································· 47

14. OPTIONAL PARTS ·········································· 51

and

No. OB409

REVISED EDITION-E

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi Electric MFZ-KA25VA

Page 1: Table Of Contents
Revision E: MFZ-KA25VA- , MFZ-KA35VA- MFZ-KA50VA- have been added. SPLIT-TYPE AIR CONDITIONERS Please void OB409 REVISED EDITION-D. INDOOR UNIT No. OB409 SERVICE MANUAL REVISED EDITION-E Models MFZ-KA25VA MFZ-KA50VA MFZ-KA25VA MFZ-KA50VA MFZ-KA25VA MFZ-KA50VA MFZ-KA25VA MFZ-KA50VA MFZ-KA25VA MFZ-KA50VA MFZ-KA35VA MFZ-KA35VA Outdoor unit service manual MFZ-KA35VA SUZ-KA•VA(H) Series (OC322)
Page 2: Technical Changes
Revision A: • MFZ-KA25VA- , MFZ-KA35VA- and MFZ-KA50VA- have been added. • “Failure mode recall function” has been corrected. • RoHS PARTS LIST has been added. Revision B: • MFZ-KA25VA- , MFZ-KA35VA- and MFZ-KA50VA- have been added. Revision C: • Information for SUZ-KA25VA(H)R1.TH and SUZ-KA35VA(H)R1.TH has been added.
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS INDOOR UNIT MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Front grille Vertical vane Fan guard Air outlet Horizontal vane Panel Catechin air filter Air cleaning filter Remote controller (Anti-Allergy Enzyme Filter, blue bellows type) Damper Air outlet Vertical vane Air inlet...
Page 4: Remote Controller
ACCESSORIES MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Drain hose Remote controller holder Fixing screw for 3.5 x 16 mm (Black) Pipe cover Band Battery (AAA) for remote controller Indoor unit mounting bracket Fixing screw for 4 x 25 mm Wood screw for the indoor unit fixation...
Page 5: Specification
SPECIFICATION Indoor model MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Function Cooling Heating Cooling Heating Cooling Heating Single phase Single phase Single phase Power supply 230 V, 50 Hz 230 V, 50 Hz 230 V, 50 Hz Air ﬂ ow (Super High) Air ﬂ ow (High/Med./Low)
Page 6 SUZ-KA50VA.TH SUZ-KA50VAR2.TH SUZ-KA25VA(H)R1.TH SUZ-KA35VA(H)R1.TH SUZ-KA50VA SUZ-KA50VA2.TH Outdoor model SUZ-KA25VA2.TH SUZ-KA35VA2.TH Indoor model Indoor model Indoor model Indoor model MFZ-KA50VA MFZ-KA50VA MFZ-KA25VA MFZ-KA35VA Function Cooling Heating Cooling Heating Cooling Heating Cooling Heating Single phase Single phase Single phase Single phase Power supply...
Page 7 Specifications and rated conditions of main electric parts Model MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Item Fuse (F11) T3.15AL 250 V Damper lock motor Right (ML1) 12 V 250 Ω (ML2) Damper lock motor Left 12 V 250 Ω (MV1) 12 V 250 Ω or 12 V 300 Ω...
Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MFZ-KA25VA MFZ-KA35VA FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 27 °C Wet-bulb temperature 19 °C Cooling : Dry-bulb temperature 27 °C Wet-bulb temperature 19 °C Heating : Dry-bulb temperature 20 °C Wet-bulb temperature 15 °C...
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MFZ-KA25VA Unit: mm MFZ-KA35VA MFZ-KA50VA INDOOR UNIT 4- 6 Hole Installation plate Indoor unit 46.5 46.5 Air out Air in 100mm or more 100mm or more Gas pipe 25, 35: 9.52(flared)3/8 50: 12.7(flared)1/2 Liquid pipe 6.35(flared)1/4 Air out...
Page 10: Wiring Diagram
WIRING DIAGRAM MFZ-KA25VA- DISP REC P.C.BOARD MFZ-KA35VA- MFZ-KA50VA- RT15 CN113 RT12 CN112 RT13 CN212 CN211 RT14 DB111 RT11 NR11 230V~ CN201 TO OUTDOOR CN202 UNIT INDOOR ELECTRONIC 12-24V LD103 CONNECTING CONTROL P.C. BOARD : Terminal block, : Connector MFZ-KA25VA- MFZ-KA35VA-...
Page 11: Refrigerant System Diagram
MFZ-KA25VA- MFZ-KA35VA- MFZ-KA50VA- REFRIGERANT SYSTEM DIAGRAM MFZ-KA25VA Unit: mm MFZ-KA35VA Refrigerant pipe 9.52 (MFZ-KA25/35VA) MFZ-KA50VA Refrigerant pipe 12.7 (MFZ-KA50VA) (with heat insulator) INDOOR UNIT Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Distributor Indoor coil thermistor RT12, RT14,...
Page 12: Performance Curves
PERFORMANCE CURVES MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA The standard specifications apply only to the operation of the air conditioner under normal condition. Operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
Page 13 Cooling capacity 11.3 13.7 12.5 11.4 10.4 45 46 Total input (cooling) 11.4 10.4 45 46 Lower limit of guaranteed operating range in heating SUZ-KA25/35/50VA : -10 SUZ-KA25/35VAH : -20 Heating capacity Total input(heating) 10.6 12.7 10.1 NOTE: The above curves are for the heating operation without any frost. OB409E...
Page 14 SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H).TH SUZ-KA25VA(H)R1.TH SUZ-KA25VA(H)R1.TH SUZ-KA25VA(H)R1.TH SUZ-KA25VA(H)R1.TH SUZ-KA25VA2.TH SUZ-KA25VA2.TH SUZ-KA25VA2.TH SUZ-KA25VA2.TH Correction of Heating total input Correction of Cooling total input Correction of Cooling capacity Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor SUZ-KA35VA(H).TH...
Page 15: Cooling Operation
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOLING operation Both indoor and outdoor unit are under the Relative humidity (%) Dry-bulb temperature same temperature/humidity condition. Air flow: High speed Operational frequency : 57 Hz (SUZ-KA25VA(H).TH) 56.5 Hz (SUZ-KA25VA(H)R1.TH, KA25VA2.TH) 77 Hz (SUZ-KA35VA(H).TH) 75 Hz (SUZ-KA35VA(H)R1.TH, KA35VA2.TH) 75 Hz (SUZ-KA50VA( ).TH)
Page 16 PERFORMANCE DATA COOLING operation MFZ-KA25VA/SUZ-KA25VA(H).TH Rated frequency 57Hz SUZ-KA25VA(H)R1.TH, SUZ-KA25VA2.TH Rated frequency 56.5Hz CAPACITY : 2.5(kW) SHF : 0.66 INPUT : 580(W) OUTDOOR DB(°C) INDOOR INDOOR WB(°C) DB(°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.41 0.48...
Page 17 PERFORMANCE DATA COOLING operation MFZ-KA25VA/SUZ-KA25VA(H).TH Rated frequency 57Hz SUZ-KA25VA(H)R1.TH, SUZ-KA25VA2.TH Rated frequency 56.5Hz CAPACITY : 2.5(kW) SHF : 0.66 INPUT : 580(W) OUTDOOR DB(°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.18 0.48 2.25 1.08 0.48...
Page 18 PERFORMANCE DATA COOLING operation MFZ-KA35VA/SUZ-KA35(H)VA.TH Rated frequency 77Hz SUZ-KA35VA(H)R1.TH, SUZ-KA35VA2.TH Rated frequency 75Hz CAPACITY : 3.5(kW) SHF : 0.65 INPUT : 1090(W) OUTDOOR DB(°C) INDOOR INDOOR WB(°C) DB(°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.11 1.93 0.47 3.94 1.85 0.47 3.78 1.78 0.47...
Page 19 PERFORMANCE DATA COOLING operation MFZ-KA35VA/SUZ-KA35(H)VA.TH Rated frequency 77Hz SUZ-KA35VA(H)R1.TH, SUZ-KA35VA2.TH Rated frequency 75Hz CAPACITY : 3.5(kW) SHF : 0.65 INPUT : 1090(W) OUTDOOR DB(°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.61 0.47 1068 3.15 1.48 0.47 1134...
Page 20 PERFORMANCE DATA COOLING operation MFZ-KA50VA/ SUZ-KA50VA( ).TH Rated frequency 75Hz SUZ-KA50VAR2.TH, SUZ-KA50VA2.TH Rated frequency 76Hz CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 1550(W) OUTDOOR DB(°C) INDOOR INDOOR DB(°C) WB(°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.64 2.54 0.45 1240...
Page 21 PERFORMANCE DATA COOLING operation MFZ-KA50VA/ SUZ-KA50VA( ).TH Rated frequency 75Hz SUZ-KA50VAR2.TH, SUZ-KA50VA2.TH Rated frequency 76Hz CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 1550(W) OUTDOOR DB(°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.70 2.12 0.45 1519 4.32 1.94 0.45...
Page 22: Heating
PERFORMANCE DATA HEATING operation MFZ-KA25VA/ SUZ-KA25VA(H).TH Rated frequency 80Hz SUZ-KA25VA(H)R1.TH, SUZ-KA25VA2.TH Rated frequency 81Hz CAPACITY : 3.4(kW) INPUT : 835(W) OUTDOOR WB(°C) INDOOR DB(°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.14 2.58 3.03 3.47 3.91 4.32 4.76 2.04 2.45 2.89...
Page 23: Service Functions
SERVICE FUNCTIONS MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 9-1. TIMER SHORT MODE For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) 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.)
Page 24: Indoor Unit
9-3. 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 is restored after power failure.
Page 25: Troubleshooting
TROUBLESHOOTING MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 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 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 26: 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 OPERATION INDICATOR lamp indication listed on the troubleshooting check table (10-4.) 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 27: Indoor Unit
2. Indoor unit failure mode table NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (10-4.). Left lamp of Right lamp of Abnormal point OPERATION OPERATION Condition Remedy (Failure mode) INDICATOR lamp INDICATOR lamp Not lighted Not lighted Normal –...
Page 28: Indoor Unit
10-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit does Indoor unit operates. OPERATION INDICATOR operates. not receive Outdoor unit does lamp on the indoor unit is Outdoor unit the signal from not operate normally. flashing ON and OFF. does not remote controller.
Page 29: Indoor Unit
10-4. TROUBLESHOOTING CHECK TABLE OPERATION INDICATOR · Flashing of OPERATION INDICATOR lamp (left-hand side lamp) Lighted indicates abnormalities. Blinking Not lighted NOTE: Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table Abnormal Operation indicator lamp Symptom Condition Remedy...
Page 30: Indoor Unit
NOTE: When the indoor unit has started operation and the above failures are detected (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. 10-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Part name Check method and criteria Figure...
Page 31: Troubleshooting Flow
10-6. TROUBLESHOOTING FLOW When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted. Indoor fan does not operate. -1. Check of indoor fan motor (upper) The indoor fan motor error has occurred, and the indoor fan does not operate. Pay careful attention to the high voltage on Turn OFF the power supply.
Page 32 When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0.5-second. Indoor fan does not operate. -2. Check of indoor fan motor (lower) The indoor fan motor error has occurred, and the indoor fan does not operate. Pay careful attention to the high voltage on Turn OFF the power supply.
Page 33: Indoor Unit
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller, display receiver P.C. board and indoor 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.
Page 34 The unit cannot be operated with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211/ CN212 and Turn OFF the power supply.
Page 35: Indoor Unit
When the left lamp of OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage of Check the power 230V AC in the power supply.
Page 36: Indoor Unit
When the left lamp of OPERATION INDICATOR lamp flashes 15-time. Indoor unit and outdoor unit do not operate. Check of damper After performing the check, make sure to release the failure mode recall function. Turn OFF the power supply. Is there anything that interferes the opening Remove the object.
Page 37: Electromagnetic Noise Enters Into Tv Sets Or Radios
Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3 m, or is the unit, or the antennas distance between the and the outdoor unit.
Page 38 10-7. TEST POINT DIAGRAM AND VOLTAGE MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA Indoor electronic control P.C. board Room temperature thermistor RT11 FUSE (F11) Indoor coil thermistor RT14 (MAIN 2) T3.15AL250V Power supply Indoor coil thermistor RT13 (SUB) input 230 V AC Indoor coil thermistor RT12 (MAIN 1)
Page 39: Disassembly Instructions
Locking lever ever. Connector MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (1) Push both sides of the upper part of the front grille and pull the front grille open, and then remove the front grille from the panel.
Page 40 OPERATING PROCEDURE PHOTOS 2. Removing the electronic control P.C. board and the Photo 3 display and receiver P.C. board (1) Remove the panel. (Refer to 1.) (2) Remove the screw of the electrical cover, and then the electrical cover. (3) Remove the screw of the earth wires under the electrical box, and then the earth wires.
Page 41 OPERATING PROCEDURE PHOTOS 4. Removing the horizontal vane motor unit Photo 6 (1) Remove the panel. (Refer to 1.) (2) Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit. (3) Disconnect the connector from the horizontal vane motor unit.
Page 42 OPERATING PROCEDURE PHOTOS 6. Removing the damper lock motor, the damper Photo 9 motor and the damper limit switch (1) Remove the panel. (Refer to 1.) (2) Remove the screws of the nozzle assembly (lower). (3) Remove the drain hose from the nozzle assembly (lower) and pull out the nozzle assembly (lower) toward you.
Page 43: Parts List
Optional parts (See 14.) 12-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol Part No. Part name in Wiring Remarks MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram M21 E0W 234 BOX ASSEMBLY T2W A4T 000 PANEL ASSEMBLY T2W A4T 010 FRONT GRILLE...
Page 44 PARTS LIST (non-RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS OB409E...
Page 45 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Remarks Part name MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram NOZZLE ASSEMBLY (UPPER) M21 E0W 235 HORIZONTAL VANE (BACK) T2W A6T 040...
Page 46 12-4. INDOOR UNIT HEAT EXCHANGER 12-4. INDOOR UNIT HEAT EXCHANGER Q'ty/unit Symbol in Wiring Part No. Part name Remarks MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram HAIR PIN COVER T2W A4T 638 M21 E0W 620 INDOOR HEAT EXCHANGER M21 E8W 620 6.35...
Page 47: Rohs Parts List
RoHS PARTS LIST (RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 13-1. INDOOR UNIT STRUCTURAL PARTS 13-2. ACCESSORY AND REMOTE CONTROLLER Optional parts (See 14.) 13-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol MFZ- Part No. Part name in Wiring Remarks 25VA- 35VA- 50VA-...
Page 48 RoHS PARTS LIST (RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 13-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS OB409E...
Page 49 RoHS PARTS LIST (RoHS compliant) 13-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol MFZ- Part No. Part name in Wiring Remarks 25VA- 35VA- 50VA- Diagram G M21 L3V 235 NOZZLE ASSEMBLY (UPPER) G M21 L4V 040 HORIZONTAL VANE (BACK) G M21 L3V 040 HORIZONTAL VANE (FRONT) G M21 L3V 071 VANE SLEEVE...
Page 50 RoHS PARTS LIST (RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 13-4. INDOOR UNIT HEAT EXCHANGER 13-4. INDOOR UNIT HEAT EXCHANGER Q'ty/unit Symbol MFZ- Part No. Part name in Wiring Remarks 25VA- 35VA- 50VA- Diagram G M21 L3V 638 HAIR PIN COVER G M21 EAK 620 INDOOR HEAT...
Page 51: Optional Parts
3 months. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. Do not remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MFZ-KA25VA- MFZ-KA25VA- MFZ-KA25VA- MFZ-KA25VA- MFZ-KA25VA-...
Page 52 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2005 MITSUBISHI ELECTRIC CORPORATION Distributed in Nov. 2012. No. OB409 REVISED EDITION-E Distributed in May 2009. No. OB409 REVISED EDITION-D 7 Distributed in Mar. 2009. No. OB409 REVISED EDITION-C 7 Distributed in Dec.

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Mitsubishi Electric MFZ-KA25VA Service Manual

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