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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Series SEZ
Indoor unit
[Model names]
SEZ-KC25VA
Model name
indication
INDOOR UNIT
WIRED REMOTE
CONTROLLER
Ceiling Concealed
[Service Ref.]
SEZ-KC25VA.W
TEMP.
ON/OFF
R410A
Note :
•This manual does not cover
outdoor units. When servicing
outdoor units, please refer
to the service manual
No.OC322 together with this
manual.
CONTENTS
1. PART NAMES AND FUNCTIONS ········2
2. SPECIFICATIONS·································4
3. OUTLINES AND DIMENSIONS············6
4. WIRING DIAGRAM ·······························7
5. REFRIGERANT SYSTEM DIAGRAM·········8
6. TROUBLESHOOTING···························9
7. DISASSEMBLY PROCEDURE ···········13
8. PARTS LIST ········································18
9. OPTIONAL PARTS ·····························21
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Related Manuals for Mitsubishi Electric SEZ-KC25VA
Summary of Contents for Mitsubishi Electric SEZ-KC25VA
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Page 1: Table Of Contents
Ceiling Concealed Series SEZ R410A Indoor unit Note : [Model names] [Service Ref.] •This manual does not cover outdoor units. When servicing SEZ-KC25VA.W outdoor units, please refer SEZ-KC25VA to the service manual No.OC322 together with this manual. CONTENTS Model name indication 1. -
Page 2: Part Names And Functions
PART NAMES AND FUNCTIONS Indoor Unit SEZ-KC25VA.W Air outlet Air outlet duct flange Air inlet Wired remote controller On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button. Operation buttons Start/Stop button... - 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-KC25VA.W Function Cooling Heating Single phase Power supply 230V , 50Hz K /h Capacity Air flow (High/Low) 474/288 Power outlet Running current 0.45 Power input Rated frequency Auxiliary heater A(kW) — Power factor Fan motor current 0.28... -
Page 5: Noise Criterion Curves
NOISE CRITERION CURVES <50Hz> SEZ-KC25VA.W NOTCH SPL(dB) High speed Low speed NC60 NC50 NC40 NC30 NC20 Appro Approximate minimum audible limit on continuous noise 1000 2000 4000 8000 OCTAVE BAND CENTER FREQUENCIES (Hz) Aux.duct Measurement location NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound may be bigger than displayed level under actual installation condition by surrounding echoes. -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS SEZ-KC25VA.W... -
Page 7: Wiring Diagram
WIRING DIAGRAM SEZ-KC25VA.W... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SEZ-KC25VA.W Refrigerant flow in cooling Refrigerant flow in heating Gas pipe Condenser/evaporator temperature thermistor (TH5) Flared joints Heat exchanger Pipe temperature thermistor/liquid (TH2) Strainer (#50 mesh) Intake air temperature thermistor TH1 mm<in> Capacity SEZ-KC25VA.W Item Gas pipe 9.52<3/8>... -
Page 9: 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 first turn off the remote controller to stop the main unit, and then turn off the breaker. - Page 10 6-3. Test point diagram 6-3-1. Indoor power board SEZ-KC25VA.W 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 11 6-3. Test point diagram 6-3-2. Indoor controller board SEZ-KC25VA.W CN2D LED1 Connector to the indoor LED2 LED3 Power supply power board (CN2S) Power supply Transmission (I.B) (R.B) (12.5~13.7V DC) (Indoor/outdoor) CN3C – Transmission (Indoor/outdoor) CN22 (0~24V DC) Remote controller connecting wire Non polarity –...
- Page 12 6-4. Trouble criterion of main parts SEZ-KC25VA.W Part name Check method and criterion Intake air temperature Measure the resistance with a tester. thermistor (TH1) (Part temperature 10°C ~ 30°C) Pipe temperature Normal Abnormal thermistor/liquid (TH2) 8kΩ~20kΩ Opened or short-circuited Condenser/evaporator...
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Page 13: Disassembly Procedure
DISASSEMBLY PROCEDURE 7-1. CONTROL BOX Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS 1.Removing the control box cover fig.1 (1) Remove the fixing screws (two) of the control box (A), and remove the cover. (Fig. 1) *At this stage, the following servicing is possible. 1 Connection check of the lead wires (listed below) which are connected to the controller board. -
Page 14: Fan And Fan Motor
7-2. FAN and FAN MOTOR Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS 1.Removing the fan casing and sirocco fan. fig.3 (1) Remove the bottom plate B. (fixing screws : six) (Fig. 3) Bottom plate B (2) Remove the fixing screws (three) of the fan cover, and turn it in direction of arrow. -
Page 15: Drain Pan
7-3. DRAIN PAN Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS fig.10 1.Removing the drain pan. (1) Remove the fixing screw (one) of the drain pan. (Fig. 10). (2) Slide the drain pan in the order of arrow , , , and remove the drain pan. - Page 16 7-4. THERMISTOR (Liquid piping temperature detection) Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS fig.12 1.Removing the thermistors. (1) Remove the drainpan with procedure 7-3. (2) Remove the bottom plate A (fixing screws : six), and remove the plate.(Fig. 12) (3) Remove the thermistors from the thermistor holders which are installed on the piping.(Fig.
- Page 17 7-5. HEAT EXCHANGER Be careful on removing heavy parts. OPERATING PROCEDURE PHOTOS fig.14 1.Removing the heat exchanger. (1) Remove the drainpan with procedure 7-3. (2) Remove the bottom plate A with procedure 7-4. (3) Remove the heat exchanger cover.(fixing screws : four) (Fig.
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Page 18: Parts List
PARTS LIST EXTERNAL PARTS SEZ-KC25VA.W 101.102.103 Part No. Part Name Spec. Dwg. No. Price 101 R61 Y85 481 Heat exchanger ass'y W273547G06 102 R61 Y18 201 Thermistor (2phase) W848734G11 103 R61 Y19 201 Thermistor (liquid) W848734G10 104 R61 Y13 661 Bottom plate A... - Page 19 BLOWER PARTS SEZ-KC25VA.W Part No. Part Name Spec. Dwg. No. Price 201 R61 Y14 140 Fan stand W267214G01 202 R61 370 130 Motor support W234925H06 203 R61 220 044 Rubber bush W837244H01 204 R61 652 131 Fixing plate W353715H01 ø...
- Page 20 CONTROL BOX PARTS SEZ-KC25VA.W CNDK CN3C CN2D CN20 CN22 Part No. Part Name Spec. Dwg. No. Price 301 R61 Y08 715 Terminal bed <3P(S1,S2,S3)> 1 P436157X01 302 R61 435 246 Terminal bed <2P(1,2)> A73S950H02 303 R61 Y65 281 Controller board ass'y...
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Page 21: Optional Parts
OPTIONAL PARTS 9-1. REFRIGERANT PIPES The air conditioner has flared connections. Please use the optional extension pipe as follows. Pipe size O.D.mm (in.) Applied unit Models Pipe length Insulation Cross-section A-Gas B-liquid MAC-440PI 9.52 MAC-441PI 6.35 SEZ-KC25VA.W (3/8) (1/4) MAC-442PI MAC-443PI... - Page 22 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN MEE04K350 Issued in Mar. 2005 New publication, effective Mar. 2005. Printed in Japan Specifications subject to change without notice.