Page 1124 - Workshop Manual - Aumark (BJ1051)

51-32
Heater and AC-Refrigerant oil
z Circulation of refrigerant is not smooth

Condition: effect of
refrigeration system
is insufficient

Phenomenon Possible reasons Diagnosis Measures
The pressures of low Refrigerant is clogged by The system is clogged Replace the condenser
pressure side and high dirt
pressure side are low.
Condenser is frosted
z Refrigerant is not circulated

Condition: refrigerati
on system is not w
orking (sometimes it
works)

Phenomenon Possible reasons Diagnosis Measures
51 It is vacuum at low The flow of refrigerant is Refrigerant can not 1. Check expansion valve.
pressure side, and the blocked by vapor or dirt. circulate. 2. Clear away the dirt
pressure of high pressure The flow of refrigerant is inside of expansion valve
side is very low. blocked by the leak of by compressed air.
It is frosted or there is ice expansion valve. 3. Replace condenser.
on the pipeline of front and 4. Make it vacuum and
rear side of condenser/dryer supplement some
or expansion valve. refrigerant.
5. Replace the expansion
valve if it is leaking.

Page 1124