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8. ADJUSTMENT
8.1 COOLING SYSTEM FAULTS
HOW TO DIAGNOSE FAULTS
It should take approximately 3 hours to reach the lowest setting temperature of 5℃ for an empty unit (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 system’s fault.
HOW TO REPAIR THE DEFAULT
1. Check the compressor
Turn on the unit and check there is electricity current flowing to the compressor using a caliper type Amp
meter, the current should be within 0.8 to 2 Amps. If the readings are not in this range, turn off and cut off the
discharge pipe and suction pipe (See COMPRESSOR ROOM VIEW AND PARTS LIST) from the compressor,
then turn the unit on again (in this case only run the compressor for a few minuets, so as to avoid the
compressor absorb moist air) and recheck the current and if there is pressure at the outlet pipe. If the current
reading is still out of range specified above and no pressure from the compressor outlet, replace the whole
compressor.
2. Check the cooling system pipe work
Carefully check the cooling system after verifying the compressor is working normally. Then follow the procedure
below.
1>. Then cut off process pipe and check the refrigerant. If there is not enough refrigerant, the fault of the refrigerant
system should be caused by the leaking. If the refrigerant is sufficient., it is probably jamed in the capillary.
2>.If the fault is on the cooling system,.
A. Infuse 0.8-1.5MP nitrogen by process pipe. test the leakage if the cooling system of the soldering point with the
soap water. Check from the the soldering point arround the compressor, and if everything is ok, remove the air-
duct board and check the soldering point around evaporator. please see the remove method and the procedure
as “6.3 REPLACING THE EVAPORATOR, PTC HEATER, CONTROL PCB,FAN MOTORS & SENSORS”.
B. Make sure the cooling system of the soldering point is normally, Then cut off the capilary around the dry filter,and
infuse 0.8-1MP nitrogen by process pipe, and please put the hand close to the cut kerf of the capilary. If there is a
little gas leak form the terminal, it means normal, or it is jamed.
C. If all the soldering point is not leaking and the capillary isn’t jamed, there are two possibility, one is leakage in the
inner condenser, another is the damage on the parts（such as evaporator,condenser and so on） in the cooling
system. If it is the inner damage, it can not be repaired, and if the damage on the parts, replace them.
3>. Make sure that there is not leakage in the cooling system, refill the refrigerant.
3. Refill the refrigerant:
1>. Using the vacuum pump form a vacuum in the system, via the joint of the low-pressure process pipe on the
compressor , the high-pressure pipeline is on the process pipe of the filter. Apply the vacuum pump for
approximately 20 minutes. Until the vacuum is lower than 100Pa. Then solder the compressor process pipe of
the filter. Keep the vacuum running while soldering this joint
2>.Fill Cooling system with refrigerant via the process pipe. (The refrigerant is R134a. Regarding refrigerant quantity
Please refer to the instruction at back label of wine cellar). Then solder the compressor process pipe after the
system is charged with refrigerant.
8.2 PTC HEATER FAULTS
HOW TO DIAGNOSE FAULTS
If the temperature of refrigeration compartment is 2℃ lower than setting temperature for an empty unit (assuming
ambient temp of over 0 degrees centigrade and continuous operation and normal temperature of the freezing
compartment), the heater fan and PTC should run normally,otherwise check the heater fan and PTC heater. If both
are working normally, there is probably a heating system fault.
HOW TO REPAIR THE DEFAULT
1. How to check the heater fan.
If the temperature of refrigeration compartment is lower than set temperature but heater fan does not function, after
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