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Mitsubishi Electric SEZ-KD12NA4 Technical & Service Manual
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Mitsubishi Electric SEZ-KD12NA4 Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
SEZ-KD09NA4
SEZ-KD12NA4
SEZ-KD15NA4
SEZ-KD18NA4
INDOOR UNIT
[Service Ref.]
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
SEZ-KD18NA4.TH
Model name
indication
December 2010
REVISED EDITION-B
CONTENTS
1. PART NAMES AND FUNCTIONS ········2
2. SPECIFICATIONS·································3
3. OUTLINES AND DIMENSIONS··········13
4. WIRING DIAGRAM ·····························14
6. HEATER CONTROL ···························16
7. TROUBLESHOOTING·························19
8. DISASSEMBLY PROCEDURE ···········30
CM
No.HWE0802A

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Summary of Contents for Mitsubishi Electric SEZ-KD12NA4

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2010 No.HWE0802A REVISED EDITION-B TECHNICAL & SERVICE MANUAL Indoor unit [Model names] [Service Ref.] SEZ-KD09NA4.TH SEZ-KD09NA4 SEZ-KD12NA4.TH SEZ-KD12NA4 SEZ-KD15NA4.TH SEZ-KD15NA4 SEZ-KD18NA4.TH SEZ-KD18NA4 CONTENTS 1. PART NAMES AND FUNCTIONS ········2 2. SPECIFICATIONS·································3 3. OUTLINES AND DIMENSIONS··········13 4.

  • Page 2: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH Air outlet Air outlet duct flange Air inlet...

  • Page 3: Specifications

    SPECIFICATIONS SEZ-KD09NA4 SEZ-KD12NA4 Model Name Capacity Cooling Heating Cooling Heating BTU/h 9000 10900 12000 13600 Power source 208/230V (60Hz) 208/230V (60Hz) Power input 0.06 0.04 0.07 0.05 Current 0.50 0.39 0.57 0.46 Temperature set range Remote controller ˚ F( ˚ C)
  • Page 4 SEZ-KD15NA4 SEZ-KD18NA4 Model Name Capacity Cooling Heating Cooling Heating BTU/h 15000 18000 17200 21600 Power source 208/230V (60Hz) 208/230V (60Hz) Power input 0.09 0.07 0.09 0.07 Current 0.74 0.63 0.74 0.63 Temperature set range Remote controller ˚ F( ˚ C) 67 to 86 (19 to 30) 63 to 83 (17 to 28) 67 to 86 (19 to 30)
  • Page 5 SOUND CRITERION CURVES <60Hz> <60Hz> SEZ-KD09NA4.TH SEZ-KD09NA4.TH NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE External static pressure: High External static pressure: High Middle Middle 0.02[in.WG](5Pa) 0.06[in.WG](15Pa) 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...
  • Page 6 <60Hz> <60Hz> SEZ-KD12NA4.TH SEZ-KD12NA4.TH NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: External static pressure: Middle Middle 0.02[in.WG](5Pa) 0.06[in.WG](15Pa) 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...
  • Page 7 <60Hz> <60Hz> SEZ-KD15NA4.TH SEZ-KD15NA4.TH NOTCH LINE NOTCH LINE SPL(dB) SPL(dB) External static pressure: High External static pressure: High Middle Middle 0.02[in.WG](5Pa) 0.06[in.WG](15Pa) 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 8 <60Hz> <60Hz> SEZ-KD18NA4.TH SEZ-KD18NA4.TH NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High External static pressure: External static pressure: Middle Middle 0.02[in.WG](5Pa) 0.06[in.WG](15Pa) 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 9 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KD09NA4 SEZ-KD09NA4 (External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz (External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz [0.16] [0.20] Limit Limit [0.16] [0.12] High [0.12] [0.08] [0.08] Middle High Rated point [0.04] Middle [0.04] Rated point [141] [176] [212]...
  • Page 10 SEZ-KD12NA4 SEZ-KD12NA4 (External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz (External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz [0.16] [0.20] [0.16] [0.12] Limit [0.12] Limit [0.08] High [0.08] High Middle Rated point [0.04] Middle [0.04] Rated point [212] [247] [282] [318] [353] [388] [424]...
  • Page 11 SEZ-KD15NA4 SEZ-KD15NA4 (External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz (External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz [0.16] [0.20] Limit Limit [0.16] [0.12] High [0.12] [0.08] High Middle [0.08] Middle Rated point [0.04] [0.04] Rated point [282] [318] [353] [388] [424] [459] [494] [530] [565] [282]...
  • Page 12 SEZ-KD18NA4 SEZ-KD18NA4 (External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz (External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz [0.16] [0.20] Limit Limit [0.16] [0.12] High [0.12] Middle [0.08] High [0.08] Middle Rated point [0.04] [0.04] Rated point [318] [353] [388] [424] [459] [494] [530] [565] [600] [636] [671] [318] [353] [388]...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SEZ-KD09NA4.TH Unit : mm(in.) SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH Drain pipe(O.D.ø32(1-1/4)) 345(13-19/32) (Emergency draining) 37(1-15/32) 100(3-15/16) Suspension bolt hole 20(13/16) 157.5 (6-7/32) 4-14X30(9/16X1-3/16) Slot 12(1/2) 37(1-15/32) 15(19/32) 2XE-ø2.9(1/8) L-ø2.9(1/8) outlet inlet Air filter 10(13/32) 625(Suspension bolt pitch) (1-15/16) (24-5/8) Knockout hole ø27(1-3/32)

  • Page 14: Wiring Diagram

    WIRING DIAGRAM SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH INSIDE SECTION OF CONTROL BOX I. B. CN01 (BLACK) CN3C (BLUE) CN24 CN32 (YELLOW) CN51 CN41 DC294-340V FUSE (RED) RECTIFY CIRCUIT CN2L CN22 (BLUE) ON OFF LED2 LED3 LED1 (WHITE) (RED) (WHITE) (WHITE) (RED)

  • Page 15: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.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)

  • Page 16: Heater Control

    HEATER CONTROL 6-1. Control specifications and Function setting Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the Function on the indoor units as shown in Table 1. Table.1 [Function table] Select unit numbers 01 to 03 or all units (AL [wired remote controller] / 07 [IR wireless remote controller]) Mode Setting...
  • Page 17 6-3. PAC-YU25HT (Optional Parts) installation The following section describes installation of the External Heater Adapter that connects to SEZ-KD NA4 series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner. (1) Parts list Check that the following parts are included in the package.
  • Page 18 For relay X use the specifications given below Operation coil Rated voltage: 12VDC Power consumption: 0.9W or less * Use the diode that is recommended by the relay manufacturer at both ends of the relay coil. The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.) To extend this length, use sheathed 2-core cable.

  • Page 19: Troubleshooting

    TROUBLESHOOTING 7-1. 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 20 7-2. SELF-CHECK FUNCTION • Refer to the installation manual that comes with each remote controller for details. • RF thermostat is not established. [Output pattern A] Errors detected by indoor unit Wired remote controller IR wireless remote controller RF thermostat Symptom Remark Beeper sounds/OPERATION...
  • Page 21 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 22 Note: Refer to the manual of outdoor unit for the details of display 7-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Room temperature thermistor (TH1) characteristics...
  • Page 23 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogging of the filter. working 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
  • Page 24 Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Abnormality of pipe temperature ther- 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 25 Abnormal point and detection method Countermeasure Error Code 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 26 7-4. 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 27 7-5. TEST POINT DIAGRAM 7-5-1. Indoor controller board SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH CN01 Power supply voltage (208 - 230VAC) SEZ-KD18NA4.TH Emergency operation Fuse(6.3A 250V) Model selection Capacity setting CN105 Radio frequency interface CN32 Remote start/stop adapter CN01 CN24 Heater control (12VDC)
  • Page 28 7-6. TROUBLE CRITERION OF MAIN PARTS SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH Part name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Part temperature 10°C(50°F) ~ 30°C(86°F)) (TH1) Normal Abnormal Pipe temperature 8kΩ~20kΩ Opened or short-circuited thermistor/liquid...
  • Page 29 7-7. 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 30: Disassembly Procedure

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH 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.
  • Page 31 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 32 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 33 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 34 Exercise caution when removing heavy parts. 6. Bearing [KD15·18NA4 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 36 New publication, effective Dec. 2010. HWE0802A Specifications subject to change without notice. Printed in Japan...

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