Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1661
1-30 HEATING AND AIR CONDITIONING
GENERAL REPAIR PROCEDURE
OIL SPECIFICATION
•
The R-134a system requires a synthetic (PAG) compressor
oil whereas the R-12 system requires a mineral compressor
oil.
The two oils must never be mixed.
•
Compressor (PAG) oil varies according to compressor
model. Be sure to use oil specified for the model of
compressor.
Specified Compressor Oil
ZXL-100PG
(ISUZU PART NO.8-97101-338-0)
HANDLING OF OIL
•
The oil should be free from moisture, dust, metal powder,
etc.
•
Do not mix with other oil.
•
The water content in the oil increases when exposed to the
air. After use, seal oil from air immediately.
(R-134a PAG Compressor Oil absorbs moisture very easily
than R-12.)
•
The compressor oil must be stored in steel containers, not
in plastic containers.
COMPRESSOR OIL CHECK
The Oil used to lubricate the compressor is circulating with the
refrigerant.
Whenever replacing any component of the system or a large
amount of gas leakage occurs, add oil to maintain the original
amount of. oil.
Oil Capacity
Capacity total in
system
DKS 15 CH
150 cc (5.0 fl.oz.)
Compressor
(Service parts)
charging amount
DKS 15 CH
150 cc (5.0 fl.oz.)
HEATING AND AIR CONDITIONING 1-31
Checking and Adjusting for Used Compressor
(1) Perform Oil return operation.
(Refer to "Oil Return Operation" in this section.)
(2) Discharge refrigerant and remove the compressor.
(3) Drain the compressor oil and measure the extracted oil with
a measuring cylinder.
(4) Check the compressor oil for contamination.
(Refer to "Contamination of Compressor Oil" in this
section.)
(5) Adjust oil level following the procedure below.
Type
Collected Amount
Charging Amount
more than 90 cc
(3.0 fl.oz.)
same as collected
amount
less than 90 cc
(3.0 fl.oz.)
90 cc (3.0 fl.oz.)
DKS-15 CH
(6) Install the compressor, then evacuate, charge and perform
oil return operation.
(7) Check system operation.
When it is impossible to perform oil return operation, the
compressor oil should be checked in the following order:
(1) Discharge refrigerant and remove the compressor.
(2) Drain the compressor oil and measure the extracted oil with
a measuring cylinder.
(3) Check the oil for contamination.
(4) If more than 90 cc (3.0 fl.oz.) for DKS-15 CH type is
extracted from the compressor, supply same amount of oil
to the compressor to be installed.
If the amount of oil extracted is less than 90 cc (3.0 fl.oz.)
for DKS-15 CH type recheck the compressor oil in the
following order:
(5) Supply 90 cc (3.0 fl.oz.) for DKS-15 CH type oil to the
compressor and install it onto the vehicle.
(6) Perform oil return operation.
(7) Remove the compressor and recheck the amount of oil.
(8) Adjust the compressor oil.
1-32 HEATING AND AIR CONDITIONING
Checking and Adjusting for Compressor
Replacement
150 cc (5.0 fl.oz.) for DKS-15 CH type of oil is charged in
compressor (service parts).
So it is necessary to drain the proper amount of oil from new
compressor.
(1) Perform oil return operation.
(2) Recover refrigerant and remove the compressor.
(3) Drain the compressor oil and measure the extracted oil with
a measuring cylinder.
(4) Check the compressor oil for contamination.
(5) Adjust oil level following the procedure below.
Type
Collected Amount
Charging Amount
more than 90 cc
(3.0 fl.oz.)
same as collected
amount
less than 90 cc
(3.0 fl.oz.)
90 cc (3.0 fl.oz.)
DKS-15 CH
(6) Evacuate, charge and perform oil return operation.
(7) Check system operation.
CONTAMINATION OF COMPRESSOR OIL
Unlike engine oil, no cleaning agent is added to the
compressor oil. Even is the compressor runs for a long period
of time (approximately 1 season), the oil never becomes
contaminated 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:
•
The capacity of the oil has increased.
•
The oil has changed color to red.
•
Foreign substances, metal powder, etc., are present in the
oil.
If any of these conditions exists, compressor oil is
contaminated. Whenever contaminated compressor oil is
discovered, the receiver/drier must be replaced.
HEATING AND AIR CONDITIONING 1-33
OIL RETURN OPERATION
There is close affinity between the oil and the refrigerant.
During normal operation, part of the oil recirculates with the
refrigerant in the system.
When checking the amount of oil in the system, or replacing
any component of the system, the compressor must be run in
advance for oil return operation. The procedure is as follows:
(1) Open the all doors and engine hood.
(2) Start the engine and A/C switch is "ON" and Set the fan
control knob at its highest position.
(3) Run the compressor for more than 20 minutes between 800
and 1,000 rpm in order to operate the system.
(4) Stop the engine.
REPLACEMENT OF COMPONENT PARTS
When replacing system component parts, supply the following
amount of oil to the component parts to be installed.
Component parts to be installed
Amount of oil
Evaporator
50 cc (1.7 fl.oz.)
Condenser
30 cc (1.0 fl.oz.)
Receiver/drier
30 cc (1.0 fl.oz.)
Refrigerant line (One piece)
10 cc (0.3 fl.oz.)
Refrigeration oil must be replenished if more than two parts
are removed at the same time. After installing these
components, check compressor oil.
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