25/27
compressor process pipe after the system is charged with refrigerant.
7.4.
Running test:
After the procedures above finish, turn the unit on. To verify the effectiveness of the repair, monitor the unit, the
compressor should automatically stop within + or - 2.5 deg centigrade of the set temperature within approx 3
hours (assuming an ambient temperature of 32
℃
and the unit is empty).
7.5. Noise problem
1 Compressor noise
1>.
The working of motor and piston motion will cause noise when compressor working. So if
noise is steady, it
’
s normal. If noise is not steady or very high, it
’
s compressor fault and it should
be maintained or replaced.
（→
6.2.3
）
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.
（→
6.2.3
）
2 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, replace the default fan please.
（→
6.1.5
）
7.6.
Refrigerant jet noise
Default: There is continuous noise like a water spray from the capillary.
Reason: The end of the capillary is in the wrong position, or there are rough edges on the end of
the capillary
Solution:
1>. Remove the evaporator
（→
6.1.3
）
, h
eat the soldered joint of the capillary
（
Fig.7
）
, 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.
（→
7.3
）
7.7.
Capillary vibration noise
Default: high frequency impact noise in capillary Zone.
Caused by either reason below:
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.
