– 45 –
(4) Abnormal sound can be heard
Cause of defect Disposition
(d) Refrigerant is excessive.
(e) Air is mixed in the unit.
(d) It is a little difficult to determine but tendencies are:
1) High pressure gauge indicates high, that is pressure at operation
indicates higher value than high pressure power shown on page
41.
2) No bubble can be seen from sight glass even if compressor is
turned at high temperature. No bubble still can be seen even if
compressor is turned with the door fully opened when outside
temperature is 35°C or more.
(e) In case a lot of bubbles can be seen from sight glass and
refrigeration is poor, although high pressure gauge indicates high,
air is mixed. As air is lighter than refrigerant, it gathers at the
highest place of the unit and so air purge can not be made.
It is necessary to vacuumize.
Cause of defect Disposition
(1) Installation work is defective.
(2) Metallic sound can be heard from inside of
compressor.
(3) Belt is loose.
(4) Fan is touching.
(5) Compressor liquid is compressed.
Check, repair and increase tightening.
Disassemble inside, check and repair or replace.
Put it on again.
Check and repair.
Check expansion valve and amount of refrigerant.
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