Mitsubishi Electric MFZ-KA25VA Service Manual
Split-type air conditioners indoor unit
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Also See for MFZ-KA25VA:
- Installation manual (144 pages) ,
- Operating instructions manual (112 pages) ,
- Service manual (52 pages)
Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA35VA -
MFZ-KA35VA -
MFZ-KA35VA -
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.
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MFZ-KA50VA -
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MFZ-KA50VA -
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MFZ-KA50VA -
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CONTENTS
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
10. TROUBLESHOOTING ····································· 23
11. DISASSEMBLY INSTRUCTIONS ···················· 37
12. PARTS LIST ····················································· 41
13. RoHS PARTS LIST ·········································· 45
14. OPTIONAL PARTS ·········································· 49
MFZ-KA25VA-
, MFZ-KA35VA-
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MFZ-KA50VA-
have been added.
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Please void OB409 REVISED EDITION-C.
REVISED EDITION-D
Outdoor unit service manual
SUZ-KA•VA(H) Series (OC322)
MXZ-A•VA Series (OB377, OC316)
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 10
8. PERFORMANCE CURVES ····························· 10
9. SERVICE FUNCTIONS ··································· 21
and
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No. OB409
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MFZ-KA25VA
Summary of Contents for Mitsubishi Electric MFZ-KA25VA
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Page 1: Table Of Contents
MFZ-KA50VA- have been added. SPLIT-TYPE AIR CONDITIONERS Please void OB409 REVISED EDITION-C. INDOOR UNIT No. OB409 SERVICE MANUAL REVISED EDITION-D Models MFZ-KA25VA - MFZ-KA50VA - MFZ-KA25VA - MFZ-KA50VA - MFZ-KA25VA - MFZ-KA50VA - MFZ-KA25VA - MFZ-KA50VA - MFZ-KA35VA - MFZ-KA35VA -... -
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
MFZ-KA25VA ACCESSORIES MFZ-KA35VA MFZ-KA50VA Drain hose Remote controller holder Fixing screw for 3.5 x 1.6 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 Outdoor Dry-bulb temperature 7 Wet-bulb temperature 6 Refrigerant piping length (one way): 5 m 1 Measured under rated operating frequency. Specifications and rating 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...
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Page 7: 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 8: 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 More than More than Air in Gas pipe 100mm 100mm 25, 35: 9.52(flared)3/8 50: 12.7(flared)1/2 Liquid pipe 6.35(flared)1/4 Air out... -
Page 9: 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 10: Refrigerant System Diagram
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, RT15 (main) RT13 (sub) -
Page 11: Indoor Unit
Wet and dry-bulb INDOOR UNIT OUTDOOR UNIT thermometers Wet-and dry-bulb thermometers BACK VIEW FRONT VIEW 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) - Page 12 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 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...
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Page 13: Heating Operation
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOLING operation Relative humidity (%) Dry-bulb temperature Both indoor and outdoor unit are under the same temperature/humidity condition. Air flow: High speed Operational frequency : 57 Hz (SUZ-KA25VA(H).TH) 56.5 Hz (SUZ-KA25VA(H)R1.TH) 77 Hz (SUZ-KA35VA(H).TH) 75 Hz (SUZ-KA35VA(H)R1.TH) 75 Hz (SUZ-KA50VA( ).TH) - Page 14 PERFORMANCE DATA COOLING operation MFZ-KA25VA/SUZ-KA25VA(H).TH Rated frequency 57Hz SUZ-KA25VA(H)R1.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 2.81 1.35 0.48...
- Page 15 PERFORMANCE DATA COOLING operation MFZ-KA25VA/SUZ-KA25VA(H).TH Rated frequency 57Hz SUZ-KA25VA(H)R1.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 16 PERFORMANCE DATA COOLING operation MFZ-KA35VA/SUZ-KA35(H)VA.TH Rated frequency 77Hz SUZ-KA35VA(H)R1.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 3.64 1.71 0.47...
- Page 17 PERFORMANCE DATA COOLING operation MFZ-KA35VA/SUZ-KA35(H)VA.TH Rated frequency 77Hz SUZ-KA35VA(H)R1.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 18 PERFORMANCE DATA COOLING operation MFZ-KA50VA/SUZ-KA50VA( ).TH Rated frequency 75Hz SUZ-KA50VAR2.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 5.40 2.43 0.45...
- Page 19 PERFORMANCE DATA COOLING operation MFZ-KA50VA/SUZ-KA50VA( ).TH Rated frequency 75Hz SUZ-KA50VAR2.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 1612...
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Page 20: Heating
PERFORMANCE DATA HEATING operation MFZ-KA25VA/SUZ-KA25VA(H).TH Rated frequency 80Hz SUZ-KA25VA(H)R1.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 3.30 3.74... -
Page 21: Service Functions
SERVICE FUNCTIONS MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 9-1. 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 22: 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 23: 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 mis-wiring. 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 24: 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 25: 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 Check point Countermeasure OPERATION OPERATION (Failure mode) INDICATOR lamp INDICATOR lamp Not lighted Not lighted Normal... -
Page 26: 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 27: 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 Check point Countermeasure... -
Page 28: 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 29: 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 doesn't operate. Pay careful attention to the high voltage on Turn OFF the power supply. - Page 30 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.
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Page 31: Indoor Unit
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. 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 the LCD display on the remote Replace the batteries. - Page 32 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.
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Page 33: 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 mis-wiring and serial signal error Turn OFF the power supply. Is there rated voltage of Check the power 230V AC in the power supply. -
Page 34: 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 35: Indoor Unit
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 36 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)
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Page 37: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever ever. Connector MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA INDOOR UNIT 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 38 OPERATING PROCEDURE PHOTOS Photo 3 2. Removing the electronic control P.C. board and the display receiver P.C. board (1) Remove the panel. (Refer to 1.) (2) Remove the screw of the electrical cover, and then the electrical cover. (See Photo 3.) (3) Remove the screw of the earth wires under the electrical box, and then the earth wires.
- Page 39 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the horizontal vane motor unit (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. (See Photo 6.) (3) Disconnect the connector from the horizontal vane motor unit.
- Page 40 OPERATING PROCEDURE PHOTOS Photo 9 6. Removing the damper lock motor, the damper motor and the damper limit switch (1) Remove the panel. (Refer to 1.) (2) Remove the screws of the nozzle assembly (lower). (See Photo 9.) (3) Remove the drain hose from the nozzle assembly (lower) and pull out the nozzle assembly (lower) toward you.
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Page 41: 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 42: Mfz-Ka50Va
PARTS LIST (non-RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS... - Page 43 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 44 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 INDOOR HEAT EXCHANGER M21 E0W 620 INDOOR HEAT EXCHANGER M21 E8W 620 6.35...
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Page 45: 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 46 RoHS PARTS LIST (RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 13-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS...
- Page 47 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 48 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 L3V 620 INDOOR HEAT EXCHANGER...
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Page 49: 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-KA35VA-... - Page 52 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2009. No. OB409 REVISED EDITION-D 7 Distributed in Mar. 2009. No. OB409 REVISED EDITION-C 7 Distributed in Dec. 2008. No. OB409 REVISED EDITION-B 7 Distributed in Jun.