DELOREAN WORKSHOP MANUAL - Free

N:10:12 Heating and Air Conditioning
REPLACING COMPRESSOR
Oil Level Check
When replacing a Sankyo compressor containing
uncontaminated oil with a new Sankyo compressor,
use the following procedure:
Step 1 — Drain the oil from the new compressor.
Step 2 - Drain and measure the oil from the old
compressor.
Step 3 — Measure new oil equal to the amount
drained from the old compressor. Add one fluid
ounce (30 cc) of new oil to this amount and use it
to refill the new compressor.
The DMC compressors are high-speed compressors.
Satisfactory operation depends on
sufficient lubrication. Too much oil decreases
cooling efficiency.
Installation Tips
Trouble-free installation and operation of a Sankyo
compressor is directly attributable to:
• Correct pulley alignment.
• Accurate fit of mounting bracket surfaces to the
engine and compressor mounting ears.
• Correct torque of all securing bolts and nuts.
• Correct tension of the drive belt.
Never operate the compressor at fast speed or for a
prolonged time with insufficient system refrigerant
charge.
Flush Procedure
Flushing of a system is advisable:
• When replacing a compressor.
• When a system has been contaminated.
Purging with R - 12 vapor or other dry vapor under
pressure is inadequate cleansing Only
recommended flushing materials should be used.
Some satisfactory materials con ining
refrigerants, such as R — 11 as a liquid : rising
agent with R — 12 vapor propellant, afe a able.
The following procedure is a method using R - 11.
Note:
When flushing with R - 11, do not allow it to enter
the compressor.
Step 1 — Disconnect both hose connections to
the compressor.
Step 2 — Remove and discard the Receiver-Drier.
Step 3 — Connect the R-11 container at the
discharge hose connection and allow
approximately one pound of R-11 to enter the
discharge side of the condenser.
Step 4 — Then connect a dry vapor container at
that same point, preferably a dry nitrogen with
pressure set between 100 and 250 psig. Allow
pressurized vapor to enter until all R-11 liquid is
purged out the inlet to receiver-drier hose
connections.
Step 5 — Cap both connections.
Step 6 — Remove expansion valve and clean.
Step 7 — Using the same procedure above, flush
and purge the liquid hose from the receiver-drier to
the expansion valve and suction hose and
evaporator.
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