5
power PCB board which fited in compressor compartment with transformer & main PCB board which fited in electrical
box.
△Cooling system faults
○How to diagnose faults:
It should take approximate 3 hours to reach the lowest setting temperature for an empty unit of both compartments
(assuming ambient temp of 32 degrees centigrade and continuous operation). If not, check the compressor, cooling fans,
controller, and sensors. If all these are working normally, there is probably a cooling pipe fault.
○Maintain the faults：
1. Check the compressor
If two zones can not refrigerate, check the rated current of the compressor with a caliper type Amp meter, and the
current should be within 0.8 to 2 Amps. If the current not in this range, turn off and cut off the pipes (Fig.5 and Fig5.1, see
point D & Fig.5 and Fig.5.1, see point A) from the compressor. Then turn on the unit and check there is electricity current
flowing to the compressor ,and check if there is pressure at the outlet pipe, If the current reading is still out of range
specified above or no pressure from the compressor outlet, replace the whole compressor .(Noted: Turn on the compressor
which cut pipe not longer than 15 minuets in order to avoid suck moist air)
2. check the cooling system pipe work
2.1>. Under the condition of the compressor normally running situation, the two zones do not refrigerate, and it is
possibly the refrigeration system leak. The maintain procedure is following.
a. Cut off discharge pipe from compressor and charge with refrigerant to 0.8—1Mpa nitrogen via the process pipe.
Then place your hand close to the broken end of discharge pipe, if you can feel a little airflow, this proves the capillary
is normal, if not it means the capillary is jammed. (Noted: There are two capillarys in synchronous dual temperature
wine cellar. If the flowing direction of refrigerant valve is not changed, you can feel a little airflow from only one of
capillary, if not, please change the flowing direction of refrigerant valve. See Page 12)
b. Weld the broken discharge pipe if capillary works normal, then charge to 0.8—1Mpa nitrogen via the process
pipe and check if there are any leaks from every soldered joint of the cooling system using soapy water and looking for
tiny bubbles, Check the soldered joints around the compressor first (Fig.5 & Fig.5.1), then check the soldered joints
around the evaporator see (Fig.3). Remove the air duct board when you check the evaporator joints, see (Fig.1&Fig.2).
c. If there are no leaks as the b item. The faults maybe :
①A leak in the condenser or anti-dew pipe. This internal leaks cannot be repaired, and it can be replaced with the
new one of the same module.
②Or a fault of other components in the unit, please replace the same module.
d.. If there are no leaks in the cooling system pipe work, please refill refrigerant
2.>.When the compressor work normally, one zone did not refrigerate, the fault is due to the component of one
