12-4
TROUBLESHOOTING
SM HDDHED 1-A.1 GB
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 voltage between two pins Hi and N of connector S80 on controller, normal voltage
is 220~240VAC.
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 ~ 1.764 Ohm ( at 20C).
Pay attention U,V, W are respective to connect to RED,YELLOW,BLUE wires.
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.
