Mitsubishi Electric SEZ-KD09NA Technical & Service Manual
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Mitsubishi Electric SEZ-KD09NA Technical & Service Manual

Split-type, heat pump air conditioners seroes sez ceiling concealed
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
2012
TECHNICAL & SERVICE MANUAL
Series SEZ
Model name
Model name
<Indoor unit>
<Indoor unit>
SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)
INDOOR UNIT
TEMP.
ON/OFF
WIRED REMOTE CONTROLLER

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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-KD09NA(4) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) INDOOR UNIT TEMP. ON/OFF WIRED REMOTE CONTROLLER...

  • Page 3: Table Of Contents

    CONTENTS 1. PART NAMES AND FUNCTIONS ···········································································2 2. SPECIFICATIONS ···································································································4 3. OUTLINES AND DIMENSIONS·············································································14 4. WIRING DIAGRAM ································································································15 5. REFRIGERANT SYSTEM DIAGRAM····································································17 6. HEATER CONTROL ······························································································18 7. TROUBLESHOOTING ···························································································21 8. DISASSEMBLY PROCEDURE··············································································34...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit SEZ-KD09NA(4) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) Air outlet Air outlet duct flange Air inlet Wired remote controller Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF 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-KD09NA(4) SEZ-KD12NA(4) Model Name Capacity Cooling Heating Cooling Heating BTU/h 8100 10900 11500 13600 Power source 208/230V (60Hz) 208/230V (60Hz) Power input 0.06 0.04 0.07 0.05 Current 0.51 0.39 0.57 0.46 Temperature set range Remote controller ˚ F( ˚ C)
  • Page 7 SEZ-KD15NA(4) SEZ-KD18NA(4) Model Name Capacity Cooling Heating Cooling Heating BTU/h 14100 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 8 SOUND CRITERION CURVES <60Hz> <60Hz> SEZ-KD09NA(4) SEZ-KD09NA(4) 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...
  • Page 9 <60Hz> <60Hz> SEZ-KD12NA(4) SEZ-KD12NA(4) NOTCH LINE NOTCH LINE SPL(dB) SPL(dB) 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 10: Spl(Db) Line

    <60Hz> <60Hz> SEZ-KD15NA(4) SEZ-KD15NA(4) 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 11: Spl(Db) Line

    <60Hz> <60Hz> SEZ-KD18NA(4) SEZ-KD18NA(4) 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 12 INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KD09NA(4) SEZ-KD09NA(4) (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...
  • Page 13 SEZ-KD12NA(4) SEZ-KD12NA(4) (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] [212] [247] [282]...
  • Page 14 SEZ-KD15NA(4) SEZ-KD15NA(4) (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 15 SEZ-KD18NA(4) SEZ-KD18NA(4) (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 16: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SEZ-KD09NA(4) Unit : mm(in.) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) 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 17: Wiring Diagram

    WIRING DIAGRAM SEZ-KD09NA SEZ-KD12NA SEZ-KD15NA SEZ-KD18NA INSIDE SECTION OF CONTROL BOX TB15 TO MA REMOTE CONTROLLER I. B. CN01 (Black) CN24 CN32 CN3C (Blue) (Yellow) CN51 CN41 ZNR02 CN2L CN22 (Blue) ON OFF DC310~340V FUSE ZNR01 Rectify circuit LED2 LED3...
  • Page 18 SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4 SEZ-KD18NA4 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 LED3 LED2 LED1 (WHITE) (RED) (WHITE) (WHITE) (RED) (WHITE) CN90 CN105 CN4F CN44...

  • Page 19: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SEZ-KD09NA(4) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) 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 20: 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[wireless remote controller]) Mode Setting...
  • Page 21 6-3. PAC-YU25HT (Optional Parts) installation The following section describes installation of the External Heater Adapter that connects to SEZ-KD NA 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 22 For relay X, use the specifications given below. 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 23: 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 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 minutes after power-on,op- For about 2 After LED 1, 2 are lighted, LED 2 is PLEASE WAIT...
  • Page 25 • 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 INDICATOR lamp flashes Check code (Number of times)

  • 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 7-3. 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:[32˚F]..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) For characteristics, refer to (P1) above. characteristics 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 ∗ Check LED display on the outdoor control cir- Indoor/outdoor unit communication 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

    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 32 7-5. TEST POINT DIAGRAM 7-5-1. Indoor controller board SEZ-KD09NA SEZ-KD12NA SEZ-KD15NA CN01 Power supply voltage (208 - 230VAC) SEZ-KD18NA Emergency operation Fuse(6.3A 250V) Model selection Capacity setting CN32 Remote start/stop adapter CN01 CN24 Heater control (12VDC) CN22 For MA remote controller cable con- nection (10 - 13 VDC (Between 1 and 3.))
  • Page 33 SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4 CN01 Power supply voltage (208 - 230VAC) SEZ-KD18NA4 Emergency operation Fuse(6.3A 250V) Model selection Capacity setting CN105 Radio frequency interface CN32 Remote start/stop adapter CN01 CN24 Heater control (12VDC) CN22 For MA remote controller cable con- nection (10 - 13 VDC (Between 1 and 3.)) CN51 Centralized control CN41 JAMA standard HA terminal A...
  • Page 34 7-6. TROUBLE CRITERION OF MAIN PARTS SEZ-KD09NA(4) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) 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 35 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 36: Disassembly Procedure

    DISASSEMBLY PROCEDURE Exercise caution when removing heavy parts. SEZ-KD09NA(4) SEZ-KD12NA(4) SEZ-KD15NA(4) SEZ-KD18NA(4) 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 37 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 38 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 39 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 40 Exercise caution when removing heavy parts. 6. Bearing [KD15·18NA(4) 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 44 http://Global.MitsubishiElectric.com New publication effective Apr. 2012 Specifications subject to change without notice HWE0802B...

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