MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–11
DAEWOO M-150 BL2
SYMPTOM DIAGNOSIS
PRESSURE TEST CHART (R-134A SYSTEM)
Condition
Related Symptons
Probable Cause
Correction
ÁÁÁÁÁ
ÁÁÁÁÁ
Discharge (high)
Pressure
Abnormally High
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D After stopping the com-
pressor, the pressure
drops quickly, then falls
gradually.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D There is air in the system.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The condenser is
excessively hot.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D There is excessive
refrigerant in the system.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.
D Reduced or no air flow
through the condenser.
D The condenser or the
radiator fins are clogged.
D Clean the condenser or
the radiator fins.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D The condenser or the
radiator fan is not working
properly.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Check the voltage and
the fan rpm.
D Check the fan direction.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Line to the condenser is
excessively hot.
ÁÁÁÁÁÁÁÁÁ
D Restricted flow of
refrigerant in the system
ÁÁÁÁÁÁÁÁ
D Locate and repair the
restriction.
ÁÁÁÁÁ
ÁÁÁÁÁ
Discharge
Pressure
Abnormally Low
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The condenser is not
hot.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D Insufficient refrigerant in the
system.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Check the system for a
leak.
D Charge the system.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D High and low pressures
are balanced soon after
stopping the
ÁÁÁÁÁÁÁÁÁ
D Faulty compressor.
ÁÁÁÁÁÁÁÁ
D Repair or replace the
compressor.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
stopping the
compressor. Low side
pressure is higher than
normal.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The outlet of the
expansion valve is not
ÁÁÁÁÁÁÁÁÁ
D Faulty expansion valve.
ÁÁÁÁÁÁÁÁ
D Replace the expansion
valve.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
frosted, low pressure
gauge indicates
vacuum.
ÁÁÁÁÁÁÁÁÁ
D Moisture in the system.
ÁÁÁÁÁÁÁÁ
D Recover, evacuate, and
recharge the system.
ÁÁÁÁÁ
ÁÁÁÁÁ
Suction (low)
Pressure
Abnormally Low
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Condenser is not hot.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D Insufficient refrigerant in the
system.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Repair the leaks.
Recover, evacuate, and
recharge the system.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The expansion valve is
not frosted and the low
pressure line is not
ÁÁÁÁÁÁÁÁÁ
D Frozen expansion valve.
ÁÁÁÁÁÁÁÁ
D Replace the expansion
valve.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
pressure line is not
cold. Low pressure
gauge indicates a
vacuum.
ÁÁÁÁÁÁÁÁÁ
D Faulty expansion valve.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Discharge temperature
is low and the air flow
from the vents is
restricted.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D The evaporator is frozen.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Clear the restricted
evaporator case drain.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The expansion valve is
frosted.
ÁÁÁÁÁÁÁÁÁ
D The expansion valve is
clogged.
ÁÁÁÁÁÁÁÁ
D Clean or replace the
expansion valve.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The receiver/dryer
outlet is cool and the
inlet is warm.
ÁÁÁÁÁÁÁÁÁ
D The receiver/dryer is
clogged.
ÁÁÁÁÁÁÁÁ
D Replace the
receiver/dryer.
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