Page 1: Table Of Contents
RoHS PARTS LIST has been added. Please void OB410. INDOOR UNIT No. OB410 SERVICE MANUAL REVISED EDITION-A Wireless type Models MFZ-KA25VA - MFZ-KA25VA - MFZ-KA35VA - MFZ-KA35VA - MFZ-KA50VA - MFZ-KA50VA - Outdoor unit service manual SUZ-KA•VA Series (OC323) MXZ-A•VA Series (OB447, OC316) CONTENTS 1.TECHNICAL CHANGES ·····································2...
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. TECHNICAL CHANGES MFZ-KA25VA- MFZ-KA25VA- MFZ-KA35VA- MFZ-KA35VA- MFZ-KA50VA- MFZ-KA50VA- 1. The operation of thermo-off-unit has been changed. (When 2 or more indoor units are connected with a multi type outdoor unit, and operated in heat mode.)
Page 3: Remote Controller
MFZ-KA25VA ACCESSORIES MFZ-KA35VA MFZ-KA50VA Drain hose Remote controller holder Fixing screw for 2 3.5 o 1.6 mm (Black) Pipe cover Band Battery (AAA) for remote controller Indoor unit mounting bracket Fixing screw for 7 4 o 25 mm Wood screw for the indoor unit fixation...
Page 4: 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 230V,50Hz 230V,50Hz 230V,50Hz Air flow(Super High) K /h Capacity Air flow(High/Med./Low) K /h 426/ 348/ 288 456/ 372/ 300...
Page 5 Dry-bulb temperature 20:Wet-bulb temperature 15: Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6: Refrigerant piping length (one way): 5m 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 250V...
Page 6: 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: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:...
Page 7: 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 100mm 100mm 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 8: Wiring Diagram
WIRING DIAGRAM MFZ-KA25VA MFZ-KA35VA DISP REC P.C.BOARD MFZ-KA50VA MODELS WIRING DIAGRAM INDOOR UNIT INDOOR ELECTRONIC CONTROL P.C. BOARD RT13 RT15 TAB3 230V~ CN113 RT12 DB111 T111 TO OUTDOOR RT12 UNIT RT11 12-24V NR11 CONNECTING RT13 CN112 CN212 CN211 RT14 CN201...
Page 9: Performance Curves
PERFORMANCE CURVES MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA The standard data contained in these 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 10 24.4 27.5 33.0 22.6 25.4 30.4 20.7 23.3 27.9 18.8 21.2 25.4 16.9 19.1 22.8 15.0 16.9 20.3 13.2 14.8 17.8 11.3 12.7 15.2 Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. SUZ-KA25VA.TH SUZ-KA25VA.TH SUZ-KA25VA.TH...
Page 11: Heating Operation
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOLING operation Relative humidity(%) Dry-bulb temperature 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 57Hz (SUZ-KA25VA.TH) 77Hz (SUZ-KA35VA.TH) 75Hz (SUZ-KA50VA.TH) SUZ-KA25VA.TH SUZ-KA35VA.TH SUZ-KA50VA.TH...
Page 12 PERFORMANCE DATA COOLING operation Rated frequency 57Hz MFZ-KA25VA/ SUZ-KA25VA.TH CAPACITY : 2.5(kW) SHF : 0.66 INPUT : 580(W) OUTDOOR DB( : ) INDOOR INDOOR WB(:) DB(:) 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 13 PERFORMANCE DATA COOLING operation Rated frequency 57Hz MFZ-KA25VA/ SUZ-KA25VA.TH CAPACITY : 2.5(kW) SHF : 0.66 INPUT : 580(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.18 0.48 2.25 1.08 0.48...
Page 14 PERFORMANCE DATA COOLING operation Rated frequency 77Hz MFZ-KA35VA/ SUZ-KA35VA.TH CAPACITY : 3.5(kW) SHF : 0.65 INPUT : 1090(W) OUTDOOR DB( : ) INDOOR INDOOR WB(:) DB(:) 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 15 PERFORMANCE DATA COOLING operation Rated frequency 77Hz MFZ-KA35VA/ SUZ-KA35VA.TH CAPACITY : 3.5(kW) SHF : 0.65 INPUT : 1090(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.43 1.61 0.47 1068 3.15 1.48 0.47 1134...
Page 16 PERFORMANCE DATA COOLING operation Rated frequency 75Hz MFZ-KA50VA/ SUZ-KA50VA.TH CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 1550(W) OUTDOOR DB( : ) INDOOR INDOOR WB(:) DB(:) 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 1302...
Page 17 PERFORMANCE DATA COOLING operation Rated frequency 75Hz MFZ-KA50VA/ SUZ-KA50VA.TH CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 1550(W) OUTDOOR DB( : ) INDOOR INDOOR DB (:) WB (:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.70 2.12 0.45 1519 4.32 1.94 0.45 1612...
Page 18 PERFORMANCE DATA HEATING operation MFZ-KA25VA/ SUZ-KA25VA.TH Rated frequency 80Hz CAPACITY : 3.4(kW) INPUT : 835(W) OUTDOOR WB( : ) INDOOR DB( : ) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.58 3.03 3.47 3.91 8.43 4.32 4.76 2.14 2.04 2.45 2.89...
Page 19: 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 20 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 has restored after power failure.
Page 21: 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 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 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 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 doesn't recur.
Page 23 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 Check point Countermeasure (Failure mode) INDICATOR lamp INDICATOR lamp Not lighted Not lighted Normal –...
Page 24 10-3. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit doesn't lamp on the indoor unit is Outdoor unit the signal from operate normally. flashing on and off. doesn't remote controller. operate.
Page 25: Troubleshooting Check Table
10-4. Troubleshooting check table · Flashing of OPERATION INDICATOR lamp (left-hand side lamp) OPERATION INDICATOR 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 26 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 Room temperature Measure the resistance with a tester.
Page 27: 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 28 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 doesn't operate. Pay careful attention to the high voltage on Turn OFF the power supply.
Page 29: Check Of Remote Controller And Receiver P.c. Board
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 wCheck if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is the LCD display on the the Replace the batteries.
Page 30 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 31: How To Check Mis-Wiring And Serial Signal Error
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 32 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 33: 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 3m, or is the unit, or the antennas distance between the and the outdoor unit.
Page 34 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) 3.15A 250V Power supply Indoor coil thermistor RT13 (SUB) input 230V AC Indoor coil thermistor RT12 (MAIN 1)
Page 35: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. 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 36 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 ground wires under the electrical box, and then the ground wires.
Page 37 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 38 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.
Page 39: Parts List
Optional parts (See 14.) 12-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol Part No. in Wiring Part name Remarks MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram M21 E0W 234 BOX ASSEMBLY T2W A4T 000 PANEL ASSEMBLY T2W A4T 010 FRONT GRILLE...
Page 40 PARTS LIST (non-RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS...
Page 41 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. Part name Remarks MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram M21 E0W 235 NOZZLE ASSEMBLY (UPPER) T2W A6T 040 HORIZONTAL VANE (BACK)
Page 42 12-4. INDOOR UNIT HEAT EXCHANGER 12-4. INDOOR UNIT HEAT EXCHANGER Q'ty/unit Symbol Part No. in Wiring Remarks Part name MFZ-KA25VA - MFZ-KA35VA - MFZ-KA50VA - Diagram T2W A4T 638 HAIR PIN COVER M21 E0W 620 INDOOR HEAT EXCHANGER M21 E8W 620 INDOOR HEAT EXCHANGER [ 6.35...
Page 43: 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-KA Part No. in Wiring Part name Remarks 25VA - 35VA -...
Page 44 RoHS PARTS LIST (RoHS compliant) MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA 13-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS...
Page 45 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-KA in Wiring Part No. Part name Remarks 25VA - 35VA - 50VA - Diagram M21 L3V 235 NOZZLE ASSEMBLY (UPPER)
Page 46 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-KA Part No. Part name in Wiring Remarks 25VA - 35VA - 50VA - Diagram M21 L3V 638 HAIR PIN COVER...
Page 47: 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-KA35VA- MAC-415FT-E MFZ-KA35VA-...
Page 48 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jun. 2006. No. OB410 REVISED EDITION-A 8 New publication, effective Jun. 2006 Distributed in May 2005. No. OB410 8 Specifications subject to change without notice.

This manual is also suitable for:

Mfz-ka50vaMfz-ka35vaMfz-ka50va Mfz-ka35va

Mitsubishi Electric MFZ-KA25VA Service Manual

Quick Links

INDOOR UNIT

SERVICE MANUAL

Troubleshooting

Related Manuals for Mitsubishi Electric MFZ-KA25VA

Summary of Contents for Mitsubishi Electric MFZ-KA25VA

This manual is also suitable for:

Table of Contents