Service manual

ManualsBrandsMitsubishi Electric ManualsAir ConditionerKA60VA

TECHNICAL & SERVICE MANUAL

CONTENTS

1. PART NAMES AND FUNCTIONS········2

2. SPECIFICATIONS·································4

3. OUTLINES AND DIMENSIONS············9

4. WIRING DIAGRAM·····························10

REFRIGERANT SYSTEM DIAGRAM

·······11

6. TROUBLESHOOTING························12

7. DISASSEMBLY PROCEDURE···········22

8. PARTS LIST········································25

9. RoHS PARTS LIST·····························27

10. OPTIONAL PARTS·····························29

INDOOR UNIT

Indoor unit

[Model names] [Service Ref.]

SEZ-KA35VA SEZ-KA35VA.TH

SEZ-KA50VA SEZ-KA50VA.TH

SEZ-KA60VA SEZ-KA60VA.TH

SEZ-KA71VA SEZ-KA71VA.TH

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

WIRED REMOTE

CONTROLLER

ON/OFF

TEMP.

Model name

indication

No.OC321

REVISED EDITION-B

Revision:

•RoHS PARTS LIST is added

in REVISED EDITION-B.

•Some descriptions have

been modified.

September 2006

•Please void OC321

REVISED EDITION-A.

Note:

• This manual describes only

service data of the indoor

units.When servicing out-

door units, please refer to

the service manual

No.OC322, OC323 together

with this manual.

• RoHS compliant products

have <G> mark on the spec

name plate.

• For servicing of RoHS

compliant products, refer

to the RoHS Parts List.

OC321A.qxp 06.8.28 3:45 PM Page 1

Summary of content (25 pages)

PAGE 1
OC321A.qxp 06.8.28 3:45 PM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS September 2006 No.OC321 REVISED EDITION-B TECHNICAL & SERVICE MANUAL Indoor unit [Model names] Revision: •RoHS PARTS LIST is added in REVISED EDITION-B. •Some descriptions have been modified. [Service Ref.] SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH SEZ-KA35VA SEZ-KA50VA SEZ-KA60VA SEZ-KA71VA •Please void OC321 REVISED EDITION-A. Note: • This manual describes only service data of the indoor units.
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OC321A.qxp 1 06.8.28 3:45 PM Page 2 PART NAMES AND FUNCTIONS Indoor Unit SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Air outlet Air outlet duct flange Air inlet (Selecting the either back side or bottom side) Wired remote controller Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
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OC321A.qxp 06.8.28 3:45 PM Page 3 ● Display “Sensor” indication Displayed when the remote controller sensor is used. Day-of-Week For purposes of this explanation, all parts of the display are shown as lit. During actual operation, only the relevant items will be lit. Shows the current day of the week. Time/Timer Display “Locked” indicator Shows the current time, unless the simple or Auto Off timer is set. If the simple or Auto Off timer is set, shows the time remaining.
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OC321A.qxp 06.8.28 3:45 PM 2 Page 4 SPECIFICATIONS Indoor model SEZ-KA35VA.TH Function Cooling Electrical data Fan motor Special remarks K /h A A W A(kW) A Winding resistance (at20:) " Dimensions WoHoD Weight Air direction Sound level (High/Low) Fan speed (High/Low) Fan speed regulator External satatic pressure Thermistor TH1 (at 25:) Thermistor TH2 (at 25:) Thermistor TH5 (at 25:) mm kg dB(A) rpm Pa k" k" k" Cooling Heating Single phase 230V, 50Hz 780/600 10 0.40 60 — 0.
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06.8.28 3:45 PM Page 5 Indoor model SEZ-KA60VA.TH Function Cooling Power supply Fan motor Electrical data Capacity Air flow (High/Low) Power outlet Running current ✽1 Power input Rated frequency Auxiliary heater Fan motor current ✽1 Model Special remarks OC321A.
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OC321A.qxp 06.8.28 3:45 PM Page 6 NOISE CRITERION CURVES <50Hz> <50Hz> SEZ-KA35VA.TH NOTCH SPL(dB) High 35 Low 30 LINE SEZ-KA50VA.TH 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
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06.8.28 3:45 PM Page 7 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KA35VA.TH Corrected Air flow Capacity Input Cooling 1.1 Correction factor Fan Performance Recommended range 60 0.9 0.8 1.3 40 20 0 1.0 5 10 15 20 25 20 25 Air flow (K/X) Correction factor External static pressure(Pa) (1Pa = 0.1mmAq) 80 5 7 10 15 20 25 Heating 1.2 1.1 1.0 0.9 Air flow (K/X) 0.8 5 10 15 Air flow (K/X) SEZ-KA50VA.
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OC321A.qxp 06.8.28 3:45 PM Page 8 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KA60VA.TH Corrected Air flow Capacity Input Cooling 1.1 Correction factor Fan Performance Recommended range 60 0.9 0.8 10 15 20 25 30 25 30 Air flow (K/X) 40 1.3 Correction factor External static pressure(Pa) (1Pa = 0.1mmAq) 80 1.0 20 0 5 10 15 20 25 Air flow (K/X) Heating 1.2 1.1 1.0 0.9 10 15 20 Air flow (K/X) SEZ-KA71VA.TH Corrected Air flow Capacity Input Cooling 1.
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06.8.28 3:45 PM 3 Page 9 OUTLINES AND DIMENSIONS Unit : mm SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Air inlet (bottom side) dimensions 930 215 77 39 77.5 100 7x100=700 (Inlet size) Electrical parts box 930 (Inlet size) 215 Select the either back side or bottom side. 51 450 955 50 w Air inlet (rear side) 150 25 1016 240 27 50 PLATE (B) x 2 120 24-{2.9 holes 150 7x100=700 955 77.5 100 25 120 12.
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OC321A.qxp 06.8.28 3:45 PM 4 Page 10 WIRING DIAGRAM SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH MF TB4 BRN 3 4 5 6 7 8 TO OUTDOOR UNIT 1 2 3 4 5 6 7 8 BLU 2 YLW 1 ORN C1 BLU YLW BLK RED WHT ORN S1 S2 S3 RED P.
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OC321A.qxp 06.8.28 3:45 PM 5 Page 11 REFRIGERANT SYSTEM DIAGRAM SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.
PAGE 12
OC321A.qxp 06.8.28 3:45 PM Page 19 6-5. TEST POINT DIAGRAM 6-5-1. Indoor power board SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH CN2S Connect to the indoor controller board (CN2D) 1 (+)) between 1 to 3 12.6-13.
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OC321A.qxp 06.8.28 3:45 PM Page 20 6-5-2. Indoor controller board LED1 Power supply LED2 Power supply (I.B) (R.B) LED3 Transmission (Indoor/outdoor) } – + CN3C Transmission (Indoor/outdoor) (0~24V DC) CN2D Connector to the indoor power board (CN2S) (12.5~13.7V DC) + SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Non polarity – CND Power supply input (220~240V AC) CN22 Remote controller connecting wire (10.4~14.
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OC321A.qxp 06.8.28 3:45 PM Page 21 6-6. TROUBLE CRITERION OF MAIN PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Part name Check method and criterion Room temperature thermistor (TH1) Measure the resistance with a tester. (Part temperature 10°C ~ 30°C) Pipe temperature thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5) Normal Abnormal 8kΩ~20kΩ Opened or short-circuited Measure the resistance between the terminals with a tester.
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OC321A.qxp 7 06.8.28 3:45 PM Page 22 DISASSEMBLY PROCEDURE SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH OPERATING PROCEDURE PHOTOS 1. Removing the electrical parts (1) Remove 2 screws of electrical cover and electrical parts cover. (See Photo 1) ● Indoor controller board (I.B) ● Terminal block (TB4,TB15) ● Indoor power board (P.
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OC321A.qxp 06.8.28 3:45 PM Page 23 PHOTOS OPERATING PROCEDURE 4. Removing the room temperature thermistor (TH1) Photo 5 (1) Remove the electrical parts cover. (Refer to 1) (2) Remove 12 screws of front panel and the front panel at fan side. (See Photo 1) (3) Remove the thermistor (TH1) from the separator panel. (See Photo 6) (4) Disconnect the connector (CN20)from the indoor controller board and pull the lead wire of thermistor (TH1) out.
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OC321A.qxp 06.8.28 3:45 PM Page 24 PHOTOS OPERATING PROCEDURE 6. Removing the drain pan (1) Unscrew each set screw on the right and left, and remove the drain pan pushing it toward the the back. (See Photo 1) Photo 8 Screws 7. Removing the heat exchanger (1) Remove the drain pan. (Refer to 6) (2) Remove the 16 screws and the Under flange at heat exchanger side. (See Photo 8) (3) Remove the 4 screws of heat exchanger.
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OC321A.qxp 06.8.28 3:45 PM 8 Page 25 PARTS LIST (non-RoHS compliant) INDOOR UNIT STRUCTURAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH 15 14 12 13 11 1 10 2 3 9 8 7 4 6 5 Q'ty/set No. Parts No. Parts name Specification SEZ-KA·VA.
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OC321A.qxp 06.8.28 3:45 PM Page 26 INDOOR UNIT ELECTRICAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH 6 5 TEMP. ON/OFF 1 2 TO REMOTE CONTROLLER 7 8 S1 S2 TO OUTDOOR UNIT 4 S3 9 3 1 2 Part numbers that is circled is not shown in the figure. Q'ty/set No. Parts No. Parts name Specification SEZ-KA·VA.TH 35 E07 159 447 INDOOR CONTROLLER BOARD 1 50 60 1 E07 160 447 INDOOR CONTROLLER BOARD I.B 1 E07 161 447 INDOOR CONTROLLER BOARD I.
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06.8.28 3:45 PM 9 Page 27 RoHS PARTS LIST INDOOR UNIT STRUCTURAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH 15 14 12 13 11 1 10 2 3 9 8 7 No. 6 5 4 RoHS OC321A.qxp Q'ty/set Parts No. Parts name Specification SEZ-KA·VA.
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OC321A.qxp 06.8.28 3:45 PM Page 28 INDOOR UNIT ELECTRICAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH 6 5 TEMP. ON/OFF 1 2 TO REMOTE CONTROLLER 7 8 S1 S2 TO OUTDOOR UNIT 4 S3 9 3 1 2 No. RoHS Part numbers that is circled is not shown in the figure. Q'ty/set Parts No. Parts name Specification 35 G E17 159 447 INDOOR CONTROLLER BOARD 1 SEZ-KA·VA.TH 50 60 G E17 160 447 INDOOR CONTROLLER BOARD I.B 1 G E17 161 447 INDOOR CONTROLLER BOARD I.
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OC321A.qxp 06.8.28 3:45 PM 10 Page 29 OPTIONAL PARTS AIR FILTER Models Applied unit SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.
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OC321A.qxp 06.8.28 3:45 PM Page 32 TM HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Sep. 2006 No.OC321 REVISED EDITION-B PDF 7 Distributed in Oct. 2005 No.OC321 REVISED EDITION-A PDF 8 Distributed in Feb. 2005 No.OC321 PDF 8 Made in Japan New publication, effective Sep. 2006 Specifications subject to change without notice.