SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2010 No.HWE0802A REVISED EDITION-B TECHNICAL & SERVICE MANUAL Indoor unit [Model names] SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4 SEZ-KD18NA4 [Service Ref.] SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH CONTENTS 1. PART NAMES AND FUNCTIONS ········2 2. SPECIFICATIONS·································3 3. OUTLINES AND DIMENSIONS··········13 4. WIRING DIAGRAM ·····························14 5. REFRIGERANT SYSTEM DIAGRAM·······15 6.
1 PART NAMES AND FUNCTIONS Indoor Unit SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.
2 SPECIFICATIONS SEZ-KD09NA4 Model Name Capacity BTU/h Power source Power input Current Temperature set range Remote controller Airflow direction Type x Quantity Fan External static press Motor type Motor output Driving mechanism Airflow rate(Low-Mid-High) Airflow rate(Low-Mid-High) Airflow rate(Low-Mid-High) External finish External dimension HxWxD Net weight Min.
SEZ-KD15NA4 Model Name Capacity BTU/h Power source Power input Current Temperature set range Remote controller Airflow direction Fan Type x Quantity External static press Motor type Motor output Driving mechanism Airflow rate(Low-Mid-High) Airflow rate(Low-Mid-High) Airflow rate(Low-Mid-High) External finish External dimension HxWxD Net weight Min.
SOUND CRITERION CURVES <60Hz> SEZ-KD09NA4.TH NOTCH SPL(dB) High 29 Middle 25 Low 22 External static pressure: 0.02[in.WG](5Pa) LINE NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
<60Hz> SEZ-KD12NA4.TH NOTCH SPL(dB) High 33 Middle 28 Low 23 External static pressure: 0.02[in.WG](5Pa) LINE NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
<60Hz> SEZ-KD15NA4.TH NOTCH SPL(dB) High 36 Middle 33 Low 29 External static pressure: 0.02[in.WG](5Pa) LINE NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
<60Hz> SEZ-KD18NA4.TH NOTCH SPL(dB) High 37 Middle 33 Low 29 External static pressure: 0.02[in.WG](5Pa) LINE NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KD09NA4 SEZ-KD09NA4 (External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz (External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz 40 [0.16] 50 [0.20] Limit External static pressure [in.WG](Pa) External static pressure [in.WG](Pa) Limit 30 [0.12] 20 [0.08] High 40 [0.16] High 30 [0.12] 20 [0.08] Middle Rated point 10 [0.04] Middle 10 [0.
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 50 [0.20] External static pressure [in.WG](Pa) External static pressure [in.WG](Pa) 40 [0.16] 30 [0.12] Limit 20 [0.08] High 40 [0.16] Limit 30 [0.12] High 20 [0.08] Middle Rated point 10 [0.04] Middle 10 [0.
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 50 [0.20] Limit External static pressure [in.WG](Pa) External static pressure [in.WG](Pa) 40 [0.16] 30 [0.12] 20 [0.08] High Middle Limit 40 [0.16] 30 [0.12] High 20 [0.08] Middle Rated point Low 10 [0.04] 10 [0.
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 40 [0.16] 50 [0.20] Limit External static pressure [in.WG](Pa) External static pressure [in.WG](Pa) Limit 30 [0.12] 20 [0.08] High Middle 10 [0.04] High 30 [0.12] Middle 20 [0.08] Low Rated point 10 [0.04] Low Rated point 0 9 [318] 40 [0.
3 OUTLINES AND DIMENSIONS SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH Unit : mm(in.) Drain pipe(O.D.ø32(1-1/4)) (Emergency draining) 159(6-9/32) 345(13-19/32) Control box 116 (4-19/32) 70 (2-25/32) 270(10-21/32) 2X2-ø2.
4 WIRING DIAGRAM SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH INSIDE SECTION OF CONTROL BOX 2 I. B.
5 REFRIGERANT SYSTEM DIAGRAM SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.
6 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 Heater control Setting Mode no. Setting Initial setting Heater OFF Inlet air temp. set temp. Heater ON Inlet air temp. < set temp.
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. 1) External output cable (with a yellow connector).............................2 in total Two types of cables with different connectors are included.
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. Control cable type: CVV, CVS, CPEV or equivalent. Cable size: 0.5 mm2 ~ 1.
7 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. 2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the components.
7-2. SELF-CHECK FUNCTION • Refer to the installation manual that comes with each remote controller for details. • RF thermostat is not established.
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. This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address “0”.
7-3. SELF-DIAGNOSIS ACTION TABLE Error Code P1 Abnormal point and detection method Room temperature thermistor (TH1) 1 The unit is in three-minute resume prevention mode if short/open of thermistor is detected. Abnormal if the unit does not reset normally after three minutes. (The unit returns to normal operation, if it has normally reset.
Error Code Abnormal point and detection method Freezing/overheating protection is working 1 Freezing protection (Cooling mode) The unit is in six-minute resume prevention mode if pipe temperature stays under -15:[5˚F] for three minutes after the compressor started. Abnormal if it stays under -15:[5˚F] for three minutes again within 16 minutes after six-minute resume prevention mode.
Error Code P9 Abnormal point and detection method Cause Countermeasure Abnormality of pipe temperature thermistor / Condenser-Evaporator (TH5) 1 The unit is in three-minute resume protection mode if short/open of thermistor is detected. Abnormal if the unit does not get back to normal within three minutes. (The unit returns to normal operation, if it has normally reset.
Error Code Abnormal point and detection method E6 Indoor/outdoor unit communication error (Signal receiving error) 1 Abnormal if indoor controller board cannot receive any signal normally for six minutes after turning the power on. 2 Abnormal if indoor controller board cannot receive any signal normally for three minutes.
7-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena (1)LED2 on indoor controller board is off. Cause • When LED1 on indoor controller board is also off. 1 Power supply of rated voltage is not supplied to outdoor unit. 2 Defective outdoor controller circuit board 3 Power supply of 208~230V is not supplied to indoor unit. 4 Defective indoor controller board (2)LED2 on indoor controller board is blinking.
7-5. TEST POINT DIAGRAM 7-5-1. Indoor controller board SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH CN01 Power supply voltage (208 - 230VAC) Fuse(6.3A 250V) SWE Emergency operation SW1 Model selection SW2 Capacity setting CN105 Radio frequency interface CN32 Remote start/stop adapter CN01 CNP CN24 Heater control (12VDC) CN22 For MA remote controller cable connection (10 - 13 VDC (Between 1 and 3.
7-6. TROUBLE CRITERION OF MAIN PARTS SEZ-KD09NA4.TH SEZ-KD12NA4.TH SEZ-KD15NA4.TH SEZ-KD18NA4.TH Part name Room temperature thermistor (TH1) Pipe temperature thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5) Check method and criterion Measure the resistance with a tester.
7-7. DC FAN MOTOR (FAN MOTOR/ INDOOR CONTROLLER BOARD) Check method of DC fan motor (fan motor / indoor controller circuit board) 1 Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. (It causes trouble of the indoor controller circuit board and fan motor.) 2 Self check Symptom : The indoor fan cannot turn around. Check the fuse (FUSE) on indoor controller board.
8 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. (A) Fig. 1 Fig. 2 2. Thermistor (Intake air) 1. Remove the control box cover according to the procedure in section [1]. (1) Pull out the thermistor holder (B) and thermistor (C) on the control box. (B),(C) Fig.
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. (a) (a) (a) (a) (D) (E) (a) Tab Fig. 4 2. Removing the drainpan (1) Pull out the drain pan in the direction of the arrow 1. Fig. 5 Note • Drain the water out of the drain pan before removing it.
Exercise caution when removing heavy parts. 4. Thermistor (Condenser / evaporator) (Liquid pipe) 1. Remove the drain pan according to the procedure in section [3]. 2. Removing the Heat exchanger cover (1) Remove the four fixing screws on the heat exchanger cover (F) to remove it. (F) Fig. 7 3. Removing the thermistor (1) Remove the thermistor (G) from the thermistor holder (H) on the copper tube. Thermistor size Liquid pipe: ø3/8inch(ø8mm) Condenser / evaporator: ø1/4inch(ø6mm) (G),(H) Fig.
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. (a) (a) (a) (J) (a) (a) Tab Fig. 9 2. Removing the fan casing (bottom half) (1) Squeeze the tabs on the fan casing to remove it in the direction of arrow 2. (a) (a) Tab Fig. 10 3.
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. (K) Fig. 13 (2) Remove the two bearing retainer screws to remove the bearing. Fig. 14 7. Heat exchanger 1. Remove the drain pan according to the procedure in section [3]. 2. Remove the heat exchanger cover according to the procedure in section [4] 2. 3.
TM HWE0802A Printed in Japan New publication, effective Dec. 2010. Specifications subject to change without notice.
