Mitsubishi Electric SEZ-KD25VAQ Technical & Service Manual
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Mitsubishi Electric SEZ-KD25VAQ Technical & Service Manual

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See also: Operating Manual , Installation Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
2012
TECHNICAL & SERVICE MANUAL
Series SEZ
Model name
Model name
<Indoor unit>
<Indoor unit>
SEZ-KD25VAQ
SEZ-KD35VAQ
SEZ-KD50VAQ
SEZ-KD60VAQ
SEZ-KD71VAQ
INDOOR UNIT
TEMP.
ON/OFF
WIRED REMOTE CONTROLLER
(option)

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  • Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS 2012 TECHNICAL & SERVICE MANUAL Series SEZ Model name Model name <Indoor unit> <Indoor unit> SEZ-KD25VAQ SEZ-KD35VAQ SEZ-KD50VAQ SEZ-KD60VAQ SEZ-KD71VAQ INDOOR UNIT TEMP. ON/OFF WIRED REMOTE CONTROLLER (option)

  • Page 3: Table Of Contents

    CONTENTS 1. PART NAMES AND FUNCTIONS ···········································································2 2. SPECIFICATIONS ···································································································4 3. OUTLINES AND DIMENSIONS·············································································17 4. WIRING DIAGRAM ································································································19 5. REFRIGERANT SYSTEM DIAGRAM····································································20 6. TROUBLESHOOTING ···························································································21 7. DISASSEMBLY PROCEDURE··············································································33...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit Air outlet Air outlet duct flange Air inlet Wired remote controller (option) 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 Down Fan Speed button...
  • Page 5 ● 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.

  • Page 6: Specifications

    SPECIFICATIONS SEZ-KD25VAQ SEZ-KD35VAQ Model Name Operation Mode Cooling Heating Cooling Heating Power source 230V (50Hz) 230V (50Hz) Power input 0.04 0.05 Current 0.39 0.46 Temperature set range Remote controller ˚ C( ˚ F) 19 to 30 (67 to 86) 17 to 28 (63 to 83)
  • Page 7 SEZ-KD50VAQ SEZ-KD60VAQ Model Name Operation Mode Cooling Heating Cooling Heating Power source 230V (50Hz) 230V (50Hz) Power input 0.07 0.07 Current 0.63 0.63 Temperature set range Remote controller ˚ C( ˚ F) 19 to 30 (67 to 86) 17 to 28 (63 to 83) 19 to 30 (67 to 86) 17 to 28 (63 to 83) Airflow direction...
  • Page 8 SEZ-KD71VAQ Model Name Operation Mode Cooling Heating Power source 230V (50Hz) Power input 0.10 Current 0.84 Temperature set range Remote controller ˚ C( ˚ F) 19 to 30 (67 to 86) 17 to 28 (63 to 83) Airflow direction Sirocco fan x 4 Type x Quantity External static press 5-15-35-50...

  • Page 9: Noise Criterion Curves

    NOISE CRITERION CURVES <50/60Hz> <50/60Hz> SEZ-KD25VAQ SEZ-KD25VAQ NOTCH LINE NOTCH LINE SPL(dB) SPL(dB) High High External static pressure: 5Pa External static pressure: 15Pa Middle Middle 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...
  • Page 10 <50/60Hz> <50/60Hz> SEZ-KD35VAQ SEZ-KD35VAQ NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: 5Pa External static pressure: 15Pa Middle Middle 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...
  • Page 11 <50/60Hz> <50/60Hz> SEZ-KD50VAQ SEZ-KD50VAQ NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: 5Pa External static pressure: 15Pa Middle Middle 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...
  • Page 12 <50/60Hz> <50/60Hz> SEZ-KD60VAQ SEZ-KD60VAQ NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: 5Pa External static pressure: 15Pa Middle Middle 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...
  • Page 13 <50/60Hz> <50/60Hz> SEZ-KD71VAQ SEZ-KD71VAQ NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: 5Pa External static pressure: 15Pa Middle Middle 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...
  • Page 14 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KD25VAQ SEZ-KD25VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz Limit Limit High Middle High Rated point Middle Rated point Airflow rate(m /min) Airflow rate(m /min) SEZ-KD25VAQ SEZ-KD25VAQ (External static pressure 35Pa) 220-240V 50/60Hz...
  • Page 15 SEZ-KD35VAQ SEZ-KD35VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz Limit Limit High High Middle Rated point Middle Rated point Airflow rate(m /min) Airflow rate(m /min) SEZ-KD35VAQ SEZ-KD35VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 220-240V 50/60Hz Limit Limit Rated point...
  • Page 16 SEZ-KD50VAQ SEZ-KD50VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz Limit Limit High High Middle Middle Rated point Rated point Airflow rate(m /min) Airflow rate(m /min) SEZ-KD50VAQ SEZ-KD50VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 220-240V 50/60Hz Limit Limit High...
  • Page 17 SEZ-KD60VAQ SEZ-KD60VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz Limit Limit High Middle High Middle Rated point Rated point Airflow rate(m /min) Airflow rate(m /min) SEZ-KD60VAQ SEZ-KD60VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 220-240V 50/60Hz Limit Limit High...
  • Page 18 SEZ-KD71VAQ SEZ-KD71VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz Limit Limit High Rated point High Middle Middle Rated point Airflow rate(m /min) Airflow rate(m /min) SEZ-KD71VAQ SEZ-KD71VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 220-240V 50/60Hz Limit High Limit...

  • Page 19: Outlines And Dimensions

    (Indoor/outdoor connecting line) Terminal block 2X2-{2.9 (Indoor/outdoor connecting line) Terminal block Refrigerant piping (Remote controller transmission line) flare connection (gas) Drain pipe(O.D.{32)(Spontaneous draining) Gas pipe Model Liquid pipe SEZ-KD25VAQ {9.52 SEZ-KD35VAQ 1000 {6.35 SEZ-KD50VAQ {12.7 SEZ-KD60VAQ {15.88 1100 1152 1198...
  • Page 20 Secure enough access space to allow for the maintenance, inspection, and replacement of the motor, fan, drain pump, heat exchanger, and electric box in one of the following ways. Select an installation site for the indoor unit so that its maintenance access space will not be obstructed by beams or other objects.

  • Page 21: Wiring Diagram

    WIRING DIAGRAM INSIDE SECTION OF CONTROL BOX R.B. TB15 I.B. CN01 (BLACK) CN3C(BLUE) CN32 CN41 CN51 ZNR02 L1:ONLY CN2L CN22(BLUE) ON OFF FUSE DC310~340V ZNR01 SEZ-KD71VAQ RECTIFY CIRCUIT LED2 LED3 LED1 CN4F CN44 CN20(RED) CNMF (BLUE) CN4F OUTDOOR UNIT t˚ t˚...

  • Page 22: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM 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...

  • Page 23: 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 24 • 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 25 [Output pattern A] Errors detected by indoor unit Wired remote Wireless remote controller controller Symptom Remark Beeper sounds/OPERATION INDICATOR lamp flashes Check code (Number of times) Intake sensor error P2, P9 Pipe (Liquid or 2-phase pipe) sensor error Indoor/outdoor unit communication error E6, E7 Drain sensor error Drain pump error...

  • Page 26: Auto Restart Function

    For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table. LED 1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is always lit. LED 2 (power for remote controller) Indicates whether power is supplied to the remote controller.

  • Page 27: Self-Diagnosis Action Table

    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. Abnormal point and detection method Countermeasure Error Code Cause Room temperature 1 Defective thermistor 1–3 Check resistance value of thermistor. thermistor (TH1) characteristics 0: ······15.0k"...
  • Page 28 Abnormal point and detection method Countermeasure Error Code 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 29 Abnormal point and detection method Countermeasure Error Code Cause Abnormality of pipe temperature ther- 1 Defective thermistor 1–3 Check resistance value of thermistor. mistor / Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 2 Check contact failure of connector (CN44) 1 The unit is in three-minute resume pro- 2 Contact failure of connector on the indoor controller board.
  • Page 30 Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication ∗ Check LED display on the outdoor control cir- 1 Contact failure, short circuit or, 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 31: Troubleshooting By Inferior Phenomena

    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. is off. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power door unit.
  • Page 32 6-5. TEST POINT DIAGRAM 6-5-1. Indoor controller board Fuse(6.3A 250V) CN01 Power supply voltage (220 - 240VAC) Emergency operation Model selection Capacity setting CN01 CN32 Remote start/stop adapter CN22 For MA remote controller cable con- nection (10 - 13 VDC (Between 1 and 3.)) CN51 Centralized control CN41 JAMA standard HA terminal A CNMF...

  • Page 33: Trouble Criterion Of Main Parts

    6-6. TROUBLE CRITERION OF MAIN PARTS 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 (TH5) Wiring diagram Motor...
  • Page 34 6-7. DC FAN MOTOR (FAN MOTOR/ INDOOR CONTROLLER BOARD) Check method of DC fan motor (fan motor / indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service. ·...

  • Page 35: Disassembly Procedure

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. 1. Control box 1. Removing the control box cover (1) Remove the two fixing screws on the cover (A) to remove it. Fig. 1 Fig. 2 2. Thermistor (Intake air) 1. Remove the control box cover according to the procedure in section [1].
  • Page 36 Exercise caution when removing heavy parts. 3. Drainpan 1. Removing the filter and the bottom plate (1) Push up the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (D), (E) to remove it.
  • Page 37 Exercise caution when removing heavy parts. 4. Thermistor (Condenser / evaporator) (Liquid pipe) 1. Remove the drain pan according to the proce- dure in section [3]. 2. Removing the Heat exchanger cover (1) Remove the four fixing screws on the heat exchanger cover (F) to remove it.
  • Page 38 Exercise caution when removing heavy parts. 5. Fan and fan motor 1. Removing the filter and the bottom plate (1) Push down the tab on the filter, and pull out the filter in the direction of the arrow 1. (2) Remove the fixing screws on the bottom plate (J) to remove it.
  • Page 39 Exercise caution when removing heavy parts. 6. Bearing [KD50·60·71VAQ model only] 1. Removing the bearing (1) Remove the two fixing screws on the bearing cover (K) to remove it. Fig. 13 (2) Remove the two bearing retainer screws to remove the bearing. Fig.
  • Page 40 http://Global.MitsubishiElectric.com New publication effective Sep. 2012 Specifications subject to change without notice HWE1008B...

This manual is also suitable for:

Sez-kd35vaqSez-kd50vaqSez-kd60vaqSez-kd71vaqSez-kd71vaq

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