SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2010 No.HWE10080 REVISED EDITION-B TECHNICAL & SERVICE MANUAL Indoor unit [Model names] [Service Ref.] SEZ-KD25VAQ.TH SEZ-KD35VAQ.TH SEZ-KD50VAQ.TH SEZ-KD60VAQ.TH SEZ-KD71VAQ.TH SEZ-KD25VAQ SEZ-KD35VAQ SEZ-KD50VAQ SEZ-KD60VAQ SEZ-KD71VAQ CONTENTS Model name indication INDOOR UNIT TEMP. ON/OFF WIRED REMOTE CONTROLLER (option) 1. PART NAMES AND FUNCTIONS ········2 2. SPECIFICATIONS·································4 3.
1 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 Up Timer Menu button (Monitor/Set button) Filter button ( button) Mode button (Return button) TEMP.
● Display “Sensor” indication Displayed when the remote controller sensor is used. Day-of-Week For purposes of this explanation, all parts of the display are shown as lit. During actual operation, only the relevant items will be lit. Shows the current day of the week. Time/Timer Display “Locked” indicator Shows the current time, unless the simple or Auto Off timer is set. If the simple or Auto Off timer is set, shows the time remaining. Indicates that remote controller buttons have been locked.
2 SPECIFICATIONS SEZ-KD25VAQ Model Name Capacity kW 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) External finish External dimension HxWxD Net weight Min.
SEZ-KD50VAQ Model Name Capacity kW 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) External finish External dimension HxWxD Net weight Min.
SEZ-KD71VAQ Model Name Capacity kW 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) External finish External dimension HxWxD Net weight Min.
NOISE CRITERION CURVES <50/60Hz> SEZ-KD25VAQ.
<50/60Hz> SEZ-KD35VAQ.
<50/60Hz> SEZ-KD50VAQ.
<50/60Hz> SEZ-KD60VAQ.
<50/60Hz> SEZ-KD71VAQ.
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-KD25VAQ SEZ-KD25VAQ (External static pressure 15Pa) 220-240V 50/60Hz (External static pressure 5Pa) 220-240V 50/60Hz 40 50 Limit Limit 40 External static pressure (Pa) External static pressure (Pa) 30 20 High High 30 20 Middle Rated point 10 Middle Low 10 Low Rated point 0 0 4 5 6 7 8 Airflow rate(m3/min) 9 4 10 SEZ-KD25VAQ 5 6 7 8 Airflow rate(m3/min) 9 10 9 10 SEZ-KD25VAQ (External static pressure 35Pa) 220-240V 50/60Hz
SEZ-KD35VAQ SEZ-KD35VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz 40 50 40 External static pressure (Pa) External static pressure (Pa) 30 Limit 20 High Limit 30 High 20 Middle Rated point 10 Middle 10 Low Rated point Low 0 0 6 7 8 9 10 Airflow rate(m3/min) 11 12 6 SEZ-KD35VAQ 7 8 9 10 Airflow rate(m3/min) 11 12 SEZ-KD35VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 220-240V 50/60Hz
SEZ-KD50VAQ SEZ-KD50VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz 50 40 Limit Limit 40 External static pressure (Pa) External static pressure (Pa) 30 20 High Middle 30 High 20 Middle Rated point Low 10 10 Low Rated point 0 0 8 9 10 11 12 13 Airflow rate(m3/min) 14 15 16 SEZ-KD50VAQ 8 9 10 11 12 13 Airflow rate(m3/min) 14 15 16 SEZ-KD50VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static pressure 50Pa) 22
SEZ-KD60VAQ SEZ-KD60VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz 40 50 Limit Limit 40 External static pressure (Pa) External static pressure (Pa) 30 20 High Middle 10 High 30 Middle 20 Low Rated point 10 Low Rated point 0 0 9 10 11 12 13 14 15 Airflow rate(m3/min) 16 17 18 19 SEZ-KD60VAQ 9 10 11 12 13 14 15 Airflow rate(m3/min) 17 18 19 SEZ-KD60VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External static p
SEZ-KD71VAQ SEZ-KD71VAQ (External static pressure 5Pa) 220-240V 50/60Hz (External static pressure 15Pa) 220-240V 50/60Hz 40 50 40 20 Limit External static pressure (Pa) External static pressure (Pa) 30 30 Limit 20 High Rated point 10 High 10 Middle Middle Rated point Low Low 0 0 11 12 13 14 15 16 17 Airflow rate(m3/min) 18 19 20 21 SEZ-KD71VAQ 12 13 14 15 16 17 Airflow rate(m3/min) 18 19 20 21 SEZ-KD71VAQ (External static pressure 35Pa) 220-240V 50/60Hz (External sta
3 OUTLINES AND DIMENSIONS Unit : mm 20 12 157.5 37 100 37 H 100XJ=K 23 20 12 57 625 (Suspension bolt pitch) 49 Knockout hole {27 (Indoor/outdoor connecting line) Terminal block Terminal block (Indoor/outdoor connecting line) (Remote controller transmission line) 70 270 1 Refrigerant piping flare connection (gas) 200 150 (Duct) 100 116 2X2-{2.
4 WIRING DIAGRAM INSIDE SECTION OF CONTROL BOX R.B. TB15 1 1 2 2 TB6 I.B.
5 REFRIGERANT SYSTEM DIAGRAM Strainer #50 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 (TH2) Room temperature thermistor (TH1) Distributor Strainer #50 19
6 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. 2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the components.
• If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause. Symptom Wired remote controller For about 2 PLEASE WAIT minutes after power-on PLEASE WAIT → Error code Display messages do not appear even when operation switch is turned ON (operation lamp does not light up). After about 2 minutes has expired after power-on LED 1, 2 (PCB in outdoor unit) After LED 1, 2 are lighted, LED 2 is turned off, then only LED 1 is lighted.
[Output pattern A] Errors detected by indoor unit Wireless remote controller Beeper sounds/OPERATION INDICATOR lamp flashes (Number of times) 1 2 3 4 5 6 7 8 9 10 11 12 No sound Wired remote controller Symptom Remark Check code P1 P2, P9 E6, E7 P4 P5 P6 EE P8 E4 – – Fb –– Intake sensor error Pipe (Liquid or 2-phase pipe) sensor error Indoor/outdoor unit communication error Drain sensor error Drain pump error Freezing/Overheating safeguard operation Communication error between indoor and outdoor units Pi
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”.
6-3. 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: for three minutes after the compressor started. Abnormal if it stays under -15: 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.
6-4. 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 220~240V is not supplied to indoor unit. 4 Defective indoor controller board (2)LED2 on indoor controller board is blinking.
6-5. TEST POINT DIAGRAM 6-5-1. Indoor controller board Fuse(6.3A 250V) CN01 Power supply voltage (220 - 240VAC) CN01 CNP SWE Emergency operation SW1 Model selection SW2 Capacity setting CN32 Remote start/stop adapter CN22 For MA remote controller cable connection (10 - 13 VDC (Between 1 and 3.
6-6. TROUBLE CRITERION OF MAIN PARTS 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.
6-7. 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.
7 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. (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) KD71VA(L) model only SEZ-KD·VA model only 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: ø8mm Condenser / evaporator: 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 [KD50·60·71VAQ 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 HWE10080 Printed in Japan New publication, effective Dec. 2010 Specifications subject to change without notice.
