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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
SEZ-KA35VA
SEZ-KA50VA
SEZ-KA60VA
SEZ-KA71VA
INDOOR UNIT
WIRED REMOTE
CONTROLLER
[Service Ref.]
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA71VA.TH
Model name
indication
TEMP.
ON/OFF
September 2006
REVISED EDITION-B
Revision:
•RoHS PARTS LIST is added
in REVISED EDITION-B.
•Some descriptions have
been modified.
•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.
CONTENTS
1. PART NAMES AND FUNCTIONS ········2
2. SPECIFICATIONS·································4
3. OUTLINES AND DIMENSIONS············9
4. WIRING DIAGRAM·····························10
5. REFRIGERANT SYSTEM DIAGRAM·······11
6. TROUBLESHOOTING ························12
7. DISASSEMBLY PROCEDURE···········22
8. PARTS LIST········································25
9. RoHS PARTS LIST·····························27
10. OPTIONAL PARTS·····························29
No.OC321
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Related Manuals for Mitsubishi Electric mr.SLIM SEZ Series
Summary of Contents for Mitsubishi Electric mr.SLIM SEZ Series
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS September 2006 No.OC321 REVISED EDITION-B TECHNICAL & SERVICE MANUAL Revision: •RoHS PARTS LIST is added in REVISED EDITION-B. •Some descriptions have Indoor unit been modified. [Model names] [Service Ref.] SEZ-KA35VA.TH •Please void OC321 SEZ-KA35VA REVISED EDITION-A. SEZ-KA50VA.TH Note: SEZ-KA50VA... -
Page 2: Part Names And Functions
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. Operation buttons Start/Stop button Set Temperature buttons... - Page 3 Display “Sensor” indication Displayed when the remote controller sensor is used. Day-of-Week For purposes of this explanation, Shows the current day of the week. all parts of the display are shown as lit. During actual operation, only Time/Timer Display the relevant items will be lit. “Locked”...
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Page 4: Specifications
SPECIFICATIONS Indoor model SEZ-KA35VA.TH SEZ-KA50VA.TH Function Cooling Heating Cooling Heating Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Air flow (High/Low) K /h 780/600 1020/720 Power outlet Running current 0.40 0.55 Power input Rated frequency Auxiliary heater A(kW) —... - Page 5 Indoor model SEZ-KA60VA.TH SEZ-KA71VA.TH Function Cooling Heating Cooling Heating Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Air flow (High/Low) K /h 1200/720 1200/720 Power outlet Running current 0.65 0.60 Power input Rated frequency Auxiliary heater A(kW) —...
- Page 6 NOISE CRITERION CURVES <50Hz> <50Hz> SEZ-KA35VA.TH SEZ-KA50VA.TH NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE TERESHOLD OF TERESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000...
- Page 7 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KA35VA.TH Corrected Air flow Capacity Input Cooling Fan Performance Recommended range Air flow (K/X) Heating Air flow (K/X) Air flow (K/X) SEZ-KA50VA.TH Corrected Airflow Capacity Input Cooling Fan Performance Recommended range Air flow (K/X) Heating Air flow (K/X) Air flow (K/X)
- Page 8 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KA60VA.TH Corrected Air flow Capacity Input Cooling Fan Performance Recommended range Air flow (K/X) Heating Air flow (K/X) Air flow (K/X) SEZ-KA71VA.TH Corrected Air flow Capacity Input Cooling Fan Performance Recommended range Air flow (K/X) Heating Air flow (K/X) Air flow (K/X)
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Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS SEZ-KA35VA.TH Unit : mm SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Air inlet (bottom side) dimensions In case of bottom side suction, Air inlet (rear side) dimensions mount the PLATE (A) on the rear side. PLATE (A) After installation, remove the (Inlet size) transportation support PLATE (B). -
Page 10: Wiring Diagram
WIRING DIAGRAM SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH TO OUTDOOR UNIT 1 2 3 4 5 6 AC220-240V 1 2 3 CNSK(RED) <fig:w1> MODELS KA35 TRANS 1 2 3 4 5 6 7 (POWER) (FAN) (POWER 1 2 3 4 5 BOARD) CNDK (CONTROL) KA50... -
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid Room temperature (TH2) thermistor (TH1) Strainer Distributor with strainer... -
Page 12: Troubleshooting
TROUBLESHOOTING 6-1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: 1 Check the power supply voltage. 2 Check the indoor/outdoor connecting wire for mis-wiring. (2) Take care the followings during servicing. 1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn off the breaker. - Page 13 • If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause. Symptom Cause Wired remote controller LED 1, 2 (PCB in outdoor unit) For about 2 •For about 2 minutes after power-on,op- After LED 1, 2 are lighted, LED 2 is PLEASE WAIT minutes after...
- Page 14 Note: Refer to the manual of outdoor unit for the details of display 6-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Error Code Meaning of error code and detection method Countermeasure Cause Abnormality of room temperature 1 Defective thermistor 1–3 Check resistance value of thermistor.
- Page 15 Error Code Meaning of error code and detection method Countermeasure Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
- Page 16 Error Code Meaning of error code and detection method Countermeasure Cause 1 Defective thermistor Abnormality of pipe temperature ther- 1–3 Check resistance value of thermistor. mistor / Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 2 Check contact failure of connector (CN29) 1 The unit is in three-minute resume pro- 2 Contact failure of connector on the indoor controller board.
- Page 17 Error Code Meaning of error code and detection method Countermeasure Cause ∗ Check LED display on the outdoor control cir- 1 Contact failure, short circuit or, Indoor/outdoor unit communication error (Signal receiving error) cuit board. (Connect A-control service tool, mis-wiring (converse wiring) of 1 Abnormal if indoor controller board PAC-SK52ST.) indoor/outdoor unit connecting...
- Page 18 6-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power is off.
- 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) between 1 1 to 3 3 12.6-13.7V DC (Pin1 1 (+)) CNSK Connect to the indoor controller board (CNDK) between 1 1 to 3 3 220-240V AC...
- Page 20 6-5-2. Indoor controller board SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH CN2D LED1 Connector to the indoor LED2 LED3 Power supply power board (CN2S) Power supply Transmission (I.B) (12.5~13.7V DC) (R.B) (Indoor/outdoor) CN3C – Transmission (Indoor/outdoor) CN22 (0~24V DC) Remote controller connecting wire Non polarity –...
- 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 Measure the resistance with a tester. thermistor (Part temperature 10°C ~ 30°C) (TH1) Normal Abnormal Pipe temperature 8kΩ~20kΩ Opened or short-circuited thermistor/liquid (TH2) Condenser/evaporator temperature thermistor...
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Page 22: Disassembly Procedure
DISASSEMBLY PROCEDURE SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH OPERATING PROCEDURE PHOTOS Service panel Photo 1 Electrical (Pipe temperature 1. Removing the electrical parts parts cover thermistor / liquid) (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.B) - Page 23 PHOTOS OPERATING PROCEDURE 4. Removing the room temperature thermistor (TH1) Photo 5 (1) Remove the electrical parts cover. (Refer to 1) Claws Motor bands Fan casing (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.
- 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.
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Page 25: Parts List
PARTS LIST (non-RoHS compliant) INDOOR UNIT STRUCTURAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Q'ty/set Price Wiring Recom- Parts No. Specification Remarks Parts name SEZ-KA·VA.TH Diagram mended Unit Amount (Drawing No.) Symbol Q'ty E07 039 086 LEFT SIDE PANEL E07 039 500 SIROCCO FAN <2PCS/SET>... - Page 26 INDOOR UNIT ELECTRICAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH TEMP. ON/OFF Part numbers that is circled is not shown in the figure. Q'ty/set Price Wiring Recom- Parts No. Specification Remarks Parts name Diagram mended SEZ-KA·VA.TH Unit Amount (Drawing No.) Symbol Q'ty E07 159 447 INDOOR CONTROLLER BOARD E07 160 447...
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Page 27: Rohs Parts List
RoHS PARTS LIST INDOOR UNIT STRUCTURAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH Q'ty/set Price Wiring Recom- Parts No. Specification Remarks Parts name SEZ-KA· VA.TH Diagram mended Unit Amount (Drawing No.) Symbol Q'ty E17 039 086 LEFT SIDE PANEL E17 039 500 SIROCCO FAN <2PCS/SET>... - Page 28 INDOOR UNIT ELECTRICAL PARTS SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH TEMP. ON/OFF Part numbers that is circled is not shown in the figure. Q'ty/set Price Wiring Recom- Specification Remarks Parts No. Parts name Diagram mended SEZ-KA·VA.TH Unit Amount (Drawing No.) Symbol Q'ty E17 159 447 INDOOR CONTROLLER BOARD E17 160 447...
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Page 29: Optional Parts
OPTIONAL PARTS AIR FILTER Applied unit Models SEZ-KA35VA.TH SEZ-KA50VA.TH PAC - 1000 FT SEZ-KA60VA.TH SEZ-KA71VA.TH... - Page 32 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 New publication, effective Sep. 2006 Distributed in Feb.
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