Section 22: HEATING AND AIR CONDITIONING
PA1553
42
6. Charge the system with the proper amount
of refrigerant through the service port near
the check valve using recommended
charging procedures.
7. Remove the hoses.
10.7 OIL ADDITION
The chart below shows the approximate amount
of oil to be added to the system when replacing
a component.
Component replaced Typical amount of oil
Evaporator
Condenser
Filter-Dryer
50 cm³ (1.7 ozs)
30 cm³ (1.0 ozs)
10 cm³ (0.3 ozs)
The amount of oil recovered with the refrigerant
recovery should be added at the same time.
FIGURE 47: ADDING OIL AFTER REPLACING A
COMPONENT
10.8 COMPRESSOR OIL CONTAMINATION
Unlike engine oil, no cleaning agent is added to
the compressor oil. Even if the compressor is
run for a long time, the oil never becomes turbid
as long as there is nothing wrong with the
compressor or its method of use. Inspect the
extracted oil for any of the following conditions:
* Dirt in the oil.
* Change to a varnish color.
* Presence of foreign substance, metal
shavings, etc. in the oil. When the oil
extracted from the compressor is as
described above, replace the oil as follows:
1. Clean the interior of the system with
approved method.
2. Replace the filter-dryer.
3. Supply with new oil as specified in
paragraph 10.6: “COMPRESSOR OIL
CHANGE”.
10.9 OIL RETURN OPERATION
There is a close affinity between oil and
refrigerant. During normal operation, part of the
oil recirculates with the refrigerant in the system.
Therefore, when checking the amount of oil in
the system or replacing any system component,
the compressor must be run in advance to
ensure return. This procedure is as follows:
* If the amount of refrigerant in the system has
decreased, charge to the proper amount.
* Start the engine and select fast idle.
* Set the fan speed to full air/full A/C and let
run for 20 minutes.
10.10 OIL CHECK INTERVAL
Unlike engine oil, it is not necessary to
frequently check or change the compressor oil.
However, it is necessary to check and replenish
or replace the compressor oil in the following
cases:
* Whenever the compressor, evaporator,
condenser or filter-dryer is replaced.
* Whenever refrigerant has leaked from the
system, evaluate the amount of oily spot.
* Whenever refrigerant is suddenly released
from the cooling cycle, replenish the
compressor (180 ml) plus 150 ml.
* Whenever any oil-related problems occur in
the cooling cycle.
10.11 LEAK TEST PROCEDURE WITH
COMPRESSOR REMOVED
When a compressor is repaired, it must be
checked prior to installation.
* Install the discharge and suction caps to the
connector.
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