TROUBLESHOOTING
SM YUD 2-A.1 GB
12-5
E5 H3
Compressor over load
protection
z
Connection of compressor OLP is loosen (the resistance
for this terminal should be less than 1ohm)
z
EEV connection problem or damaged/Capillary problem
z
Refrigerant leakage
E6 E6
Communication malfunction
z
Wiring
mistakes
z
IDU or ODU PCB problem
F3 F3
OAT
failure
F2 F2
OCT
failure
F4 F4
CTT
failure
z
Senor was broken or damaged
z
PCB temperature detection circuit has problem
08
Deicing
Normal function during heating
09
Oil return
Normal function
LP
Mismatch between IDU and
ODU
z
Wiring
mistakes
z
IDU or ODU PCB problem
z
IDU jumper setting is wrong
E5
PA
AC over current protection
z
Supply voltage is unstable
z
Supply voltage is too low and load is too high
E5 PF
Driver board ambient
temperature sensor failure
E5 PP
AC under voltage/ AC over
voltage
z
Supply voltage is unstable
z
PCB is damaged
E5 PU
Charging malfunction of
capacitor
z
Reactor
open
z
Charging relay or other components damaged on PCB.
12.1.4
Checking the refrigeration system
Checking system pressures and other thermodynamic measures should be done when system
is in Test Mode (in Test mode, system operates in fixed settings). The performance curves
given in this manual are given for unit performance in test mode when high indoor fan speed is
selected.
Entering test mode please refer to section 11- Control system.
12.2
Simple procedures for checking the Main Parts
12.2.1
Checking Mains Voltage.
Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this
range, abnormal operation of the system is expected. If in range check the Power (Circuit)
Breaker and look for broken or loosed cable lugs or wiring mistake(s).
12.2.2 Checking
Power
Input.
If Indoor unit power LED is unlighted, power down the system and check the fuse of the Indoor
unit. If the fuse is OK replace the Indoor unit controller. If the fuse has blown, replace the fuse
and power up again.
Checking Power Input procedure for the Outdoor unit is the same as with the Indoor unit.
12.2.3
Checking the Outdoor Fan Motor.
Check the output voltage between two wires (RED and BLACK) of connector Controller DC-
MOTOR, normal voltage is 310VDC.
12.2.4
Checking the Compressor.
The compressor is brushless permanence magnetic DC motor. Three coil resistance is
same. Check the resistance between three poles. The normal value should be below 0.7
ohm.
12.2.5
Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two pins of reverse valve connector,
normal voltage is 220~240VAC.
Summary of Contents for YUD024
Page 28: ...OUTLINE DIMENSIONS 4 4 SM YUD 2 A 1 GB 4 5 3 Outdoor unit YUD 048 060 ...
Page 48: ...WIRING DIAGRAMS SM YUD 2 A 1 GB 8 1 8 WIRING DIAGRAMS 8 1 AWAU YUD024 H11 AWAU YUD030 H11 ...
Page 49: ...WIRING DIAGRAMS 8 2 SM YUD 2 A 1 GB 8 2 AWAU YUD036 H11 ...
Page 50: ...WIRING DIAGRAMS 8 3 AWAU YUD036 H13 AWAU YUD042 H13 SM YUD 2 A 1 GB 8 3 ...
Page 51: ...WIRING DIAGRAMS 8 4 SM YUD 2 A 1 GB 8 4 AWAU YUD048 H13 AWAU YUD060 H13 ...
Page 52: ...WIRING DIAGRAMS SM YUD 2 A 1 GB 8 5 8 5 AWSI CAD024 N11 ...
Page 53: ...WIRING DIAGRAMS 8 6 SM YUD 2 A 1 GB 8 6 AWSI CAD030 036 042 N11 ...
Page 54: ...WIRING DIAGRAMS 8 7 AWSI FAD024 N11 SM YUD 2 A 1 GB 8 7 ...
Page 55: ...WIRING DIAGRAMS 8 8 SM YUD 2 A 1 GB 8 8 AWSI FAD030 036 048 N11 ...
Page 56: ...WIRING DIAGRAMS 8 9 AWSI DBD024 030 036 048 060 N11 SM YUD 2 A 1 GB 8 9 ...
Page 79: ...SPARE PARTS LIST 13 3 Exploded view of Indoor unit DBD024 060 SM YUD 2 A 1 GB 13 3 ...
Page 81: ...SPARE PARTS LIST 13 5 Exploded view of Indoor unit DBD036 SM YUD 2 A 1 GB 13 5 ...
Page 83: ...SPARE PARTS LIST 13 7 Exploded view of Indoor unit DBD060 SM YUD 2 A 1 GB 13 7 ...
Page 85: ...SPARE PARTS LIST 13 9 Exploded view of Indoor unit CAD024 SM YUD 2 A 1 GB 13 9 ...
Page 87: ...SPARE PARTS LIST SM YUD 2 A 1 GB 13 11 13 11 Exploded view of Indoor unit CAD030 ...
Page 89: ...SPARE PARTS LIST 13 13 Exploded view of Indoor unit CAD036 042 SM YUD 2 A 1 GB 13 13 ...
Page 92: ...SPARE PARTS LIST 13 16 SM YUD 2 A 1 GB 13 16 Exploded view of Indoor unit FAD024 ...
Page 94: ...SPARE PARTS LIST 13 18 SM YUD 2 A 1 GB 13 18 Exploded view of Indoor unit FAD030 036 ...
Page 97: ...SPARE PARTS LIST 13 21 Exploded view of Indoor unit FAD048 SM YUD 2 A 1 GB 13 21 ...
Page 99: ...SPARE PARTS LIST 13 23 Exploded view of outdoor unit YUD024 030 SM YUD 2 A 1 GB 13 23 ...
Page 101: ...SPARE PARTS LIST 13 25 Exploded view of outdoor unit YUD036 SM YUD 2 A 1 GB 13 25 ...
Page 103: ...SPARE PARTS LIST 13 27 Exploded view of outdoor unit YUD036T YUD042 SM YUD 2 A 1 GB 13 27 ...
Page 105: ...SPARE PARTS LIST 13 29 Exploded view of outdoor unit YUD048 060 SM YUD 2 A 1 GB 13 29 ...
Page 107: ...APPENDIX 14 APPENDIX APPENDIX SM YUD 2 A 1 GB 14 1 ...