13
verifying no bad connections replace the fan unit .
2. How to check the PTC heater
Check the resistance of PTC heater using a
Multimeter
; the reading should be approx 1.5 K
Ω
(assuming normal
temperature), if open circuits Replace the PTC heater having once verified the connections to the PTC
heater.Replace new one.
3. If no fault in the fan or PTC heater, replace the main PCB,
8.3 NOISE OF WINE COOLER
COMPRESSOR NOISE
1. The working of motor and piston motion will cause noise when compressor working. So if noise is steady and not
exceeds 42 dB, it’s normal. If noise is not steady or very high, it’s compressor fault and it should be repaired or
replaced.
2. If compressor’s shock absorption rubber is hardening or damaged, or fixing screw of compressor is too tight or
loose, it will cause noise. The settlement is to change new shock absorption rubber or adjust fixing screws.
FAN NOISE
1. When the fans are running , the vanes are circumrotating rapidly and the air flows, which will cause steady and
standard noise. The noise should not exceed 32dB and it is normal.
2. If the noise is extremely high and abnormal, the cause maybe as below
a. The axis of the fan is broken
b. The fan is broken and lost balance
REFRIGERANT JET NOISE
COMPLAINT
: If here is intermittent noise like a water spray from the capillary.
CAUSE
: The end of the capillary in the evaporator is in the wrong position, or there are rough edges on the end of
the capillary
REMEDY
:
1>. Heat the soldered joint of the capillary (“A” of Fig.8), then remove the capillary from the evaporator and smooth
the end with an eraser. (Caution: do not allow any particles into capillary unit)
2>. Replace the capillary into the evaporator, then solder it back into the correct position (not exceeding 15mm in
the evaporator) and pack the joint with anti vibration compound
3>. Recharge with refrigerant.
CAPILLARY VIBRATION NOISE
COMPLAINT
: high frequency impact noise in capillary Zone.
CAUSE
:
1>. The capillary being insert too deep into the evaporator, so when the refrigerant is Jetting, the end of vibrating
capillary will hit the inside of the evaporator.
2>. Vibration from the capillary touching the inside of the cabinet or air duct board, then when refrigerant is jetting.
REMEDY
:
1>. If the capillary is inserted too deep, heat it with the solder, solder it again(Please noted, the deep inserted is
not bigger than 15mm), and vacuumize it and add the refrigerant.
2>. If the capillary touch the inner cabinet and the air duct panel, adjust the position of the capillary and add the
incabloc plastic.
OIL JAMMED NOISE
COMPLAINT
: intermittent and deep jet noise coming from inside of the capillary.
CAUSE
: Compressor oil flowing into the cooling system pipe work because of wine cooler lean during
transportation, and the jetting oil in the capillary cause noise.
REMEDY
:Clean the cooling system pipe, and recharge with refrigerant
8.4 EVAPORATOR FREEZING
CAUSE
:The gasket is not air-proof, or the door is not closed well, cause much water fill in the the cabinet, and the
water got frozen when it encounter the cold air, sometimes the ice is too thick, and it will block the fan or
broken the fan.