Mitsubishi Electric SEZ-KC25VA Technical & Service Manual Download | Manualshive

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12

6-4. Trouble criterion of main parts
SEZ-KC25VA.W

Intake air temperature
thermistor (TH1)

Condenser/evaporator
temperature thermistor (TH5)

Measure the resistance with a tester.
(Part temperature 10

°

C ~ 30

°

C)

Pipe temperature
thermistor/liquid (TH2)

Indoor fan motor
(MF)

Check method and criterion

Part name

Normal

8k

Ω

~20k

Ω

Abnormal

Opened or short-circuited

Measure the resistance between the terminals using a tester.

(at 20˚C)

Motor terminal

or

Relay connector

Normal

Abnormal

Open or short

White-Black

261

Ω

White-Brown
White-Yellow

White-Blue

294

Ω

389

Ω

475

Ω

White

Orange

Red

Black

Brown

Yellow

Blue

1

2

4

7

5

6

Protector

Relay connector

3

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Summary of Contents for SEZ-KC25VA

Page 1: ...PROCEDURE 13 8 PARTS LIST 18 9 OPTIONAL PARTS 21 INDOOR UNIT Indoor unit Model names Service Ref SEZ KC25VA SEZ KC25VA W SPLIT TYPE HEAT PUMP AIR CONDITIONERS WIRED REMOTE CONTROLLER ON OFF TEMP Ceiling Concealed Series SEZ R410A Model name indication Note This manual does not cover outdoor units When servicing outdoor units please refer to the service manual No OC322 together with this manual ...

Page 2: ...e button Return button Set Time buttons Back Ahead Timer On Off button Set Day button Opening the door Start Stop button Fan Speed button Filter button return sign button Test Run button Service button Clear button Airflow Up Down button Louver button Operation button To preceding operation number Ventilation button Operation button To next operation number On the controls are set the same operati...

Page 3: ...is set Up Down Air Direction indica tor The indicator shows the direc tion of the outcoming airflow One Hour Only indicator Displayed if the airflow is set to weak and downward during COOL or DRY mode Operation varies according to model The indicator goes off after one hour at which time the airflow di rection also changes Room Temperature display Shows the room temperature Louver display Indicate...

Page 4: ...Thermistor RT11 at 25 Thermistor RT12 at 25 Thermistor RT13 at 25 K h A A W A kW A Ω mm kg dB A kΩ kΩ kΩ Electrical data Fan motor Special remarks Capacity NOTE Test conditions are based on ISO 5151 Cooling Indoor D B 27 W B 19 Outdoor D B 35 W B 24 Heating Indoor D B 20 W B 5 Outdoor D B 7 W B 6 Refrigerant piping length one way 5m 1 Measured under rated operating frequency 1 5 440V 250V 6 3A ERZ...

Page 5: ...36 SPL dB 25 50Hz NOTCH High speed Low speed NOISE CRITERION CURVES 2m Aux duct 1m 1 5m 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 The sound level can be higher by about 2 dB than the displayed level during cooling and heat...

Page 6: ...ng bolt pitch 15 113 Air outlet Air inlet 4 5 0 5 0 1 5 0 3 0 0 4 5 0 2X3 ø 3hole 2 5 5 0 0 5 0 1 5 0 1 2 3 Note 1 Use M10 screw for the lifting bolt field supply 2 Keep the service space for the maintenance from the bottom when the heat exchanger is cleaned 3 The direction of air intake can be changed from the bottom to the rear by attaching the bottom plate to the air intake side 4 Drain Pan is ...

Page 7: ...RELESS CENTRALLY CONTROL CONNECTOR HA TERMINAL A CONNECTOR REMOTE SWITCH CONNECTOR LOSSNAY I B P B SYMBOL INDOOR CONTROLLER BOARD NAME INDOOR POWER BOARD SYMBOL C MF FAN MOTOR CAPACITOR FAN MOTOR NAME TB4 TERMINAL BLOCK INDOOR OUTDOOR CONNECTING LINE TB15 TERMINAL BLOCK REMOTE CONTROLLER TRANSMISSION LINE TH1 INTAKE AIR TEMP THERMISTOR 0 C 15kΩ 25 C 5 2kΩ DETECT TH2 PIPE TEMP THERMISTOR LIQUID 0 C...

Page 8: ...pipe ø 6 35 1 4 Capacity Item Refrigerant flow in cooling Refrigerant flow in heating Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Strainer 50 mesh Heat exchanger Intake air temperature thermistor TH1 Gas pipe Flared joints SEZ KC25VA W ...

Page 9: ...oor outdoor unit communication error P4 Drain sensor error P5 Drain pump error P6 Freeing Overheating safeguard operation EE Communication error between indoor and outdoor units P8 Pipe temperature error E0 E3 E5 Remote controller transmission error E1 E2 Remote controller control board error Fb Indoor unit control system error memory error etc E9 Indoor outdoor unit communication error Transmitti...

Page 10: ...diagram 6 3 1 Indoor power board SEZ KC25VA W 10 CNSK Connect to the indoor controller board CNDK Between 1 1 to 3 3 220 240V AC CN2S Connect to the indoor controller board CN2D Between 1 1 to 3 3 12 6 13 7V DC Pin1 1 ...

Page 11: ...ing CN2L Connector LOSSNAY CN51 Centrally control CN29 Condenser evaporator temperature thermistor TH5 CN21 Pipe temperature thermistor Liquid TH2 CN20 Room temperature thermistor TH1 CN22 Remote controller connecting wire 10 4 14 6V DC LED3 Transmission Indoor outdoor LED2 Power supply R B LED1 Power supply I B CN2D Connector to the indoor power board CN2S 12 5 13 7V DC CN3C Transmission Indoor o...

Page 12: ...re thermistor liquid TH2 Indoor fan motor MF Check method and criterion Part name Normal 8kΩ 20kΩ Abnormal Opened or short circuited Measure the resistance between the terminals using a tester at 20 C Motor terminal or Relay connector Normal Abnormal Open or short White Black 261 Ω White Brown White Yellow White Blue 294 Ω 389 Ω 475 Ω White Orange Red Black Brown Yellow Blue 1 2 4 7 5 6 Protector ...

Page 13: ...servicing is possible 1 Connection check of the lead wires listed below which are connected to the controller board Power supply TB4 lead wire Fan motor MF lead wire Intake air sensor TH1 lead wire Liquid Cond Eva piping sensor TH5 lead wire piping sensor TH2 lead wire 2 Control board I B exchange 3 4 Intake air sensor TH1 exchange Terminal block TB4 TB15 exchange Be careful on removing heavy part...

Page 14: ...ws three of the fan cover and turn it in direction of arrow Fig 4 3 Remove the fixing screws two of the fan cover and loosen the set screw of the sirocco fan and remove the fan cover and sirocco fan Fig 5 2 Removing the fan motor 1 Remove the control box fixing screws two Fig 7 2 Move the control box to place that is not block operation Fig 8 3 Remove the fan motor cable connector in the control b...

Page 15: ...fig 11 OPERATING PROCEDURE PHOTOS 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 Fig 11 Be careful on removing heavy parts 7 3 DRAIN PAN ...

Page 16: ...rews six and remove the plate Fig 12 3 Remove the thermistors from the thermistor holders which are installed on the piping Fig 13 liquid piping fine piping fig 12 fig 13 Be careful on removing heavy parts 1 Removing the thermistors Thermistor Bottom plate A 7 4 THERMISTOR Liquid piping temperature detection ...

Page 17: ...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 14 4 Remove the heat exchanger fixing screws three Fig 15 Fig 16 fig 14 fig15 fig 16 Be careful on removing heavy parts ...

Page 18: ...H2 1 W848734G10 104 R61 Y13 661 Bottom plate A 1 W635907G02 105 R61 Y14 661 Bottom plate B 1 W877415G02 106 R61 Y10 529 Drain pan 1 W877416G01 107 R61 Y06 501 Filter 1 W634781H01 108 R61 151 326 Lifting plate 4 W398770H02 Dwg No Price No Part No Part Name Spec KC25VA 107 108 105 106 104 101 102 103 PARTS LIST 8 EXTERNAL PARTS SEZ KC25VA W ...

Page 19: ... bush 2 W837244H01 204 R61 652 131 Fixing plate 2 W353715H01 205 R61 Y38 221 Motor P20L CRC4417BB1ø23W MF 1 P714880X01 206 R61 Y16 118 Fan cover 1 W879404G03 207 R40 045 103 Sirocco fan ass y 1 W234904G01 Dwg No Price No Part No Part Name Spec KC25VA BLOWER PARTS SEZ KC25VA W 201 202 203 204 203 205 206 207 ...

Page 20: ...R61 Y65 281 Controller board ass y 1 P785032X01 304 R61 R92 281 Power supply board ass y 1 P785020X01 305 R61 Y01 287 Thermistor 1 W891304G16 306 R61 Y14 252 Capacitor 1 P412234X01 Dwg No Price No Part No Part Name Spec KC25VA 306 303 304 305 301 302 S1 1 2 S2 S3 FAN CNDK CND CN3C CN2D CN20 CN22 20 CONTROL BOX PARTS SEZ KC25VA W ...

Page 21: ... D mm in Cross section A Gas 9 52 3 8 6 35 1 4 27 21 B liquid Insulation C D 3m 5m 7m 10m MAC 440PI MAC 441PI MAC 442PI MAC 443PI 9 OPTIONAL PARTS 9 1 REFRIGERANT PIPES The air conditioner has flared connections Please use the optional extension pipe as follows ...

Page 22: ...350 Issued in Mar 2005 Printed in Japan New publication effective Mar 2005 Specifications subject to change without notice TM HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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