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9
10.Evacuate the system to an absolute holding
pressure of 200 microns or less.
NOTE: This procedure can be speeded up by
the use of heat lamps, or by breaking the
vacuum with refrigerant or dry nitrogen at
5,000 microns. Pressure system to 5 PSIG
and leave in the system a minimum of 10
minutes. Recover refrigerant, and proceed
with evacuation to a pressure of 200 microns
or a minimum of 10%.
11. Break the vacuum by charging the system
from the high side with the correct amount of
refrigerant specified. This will prevent boiling
the oil out of the crankcase.
NOTE: If the entire charge will not enter the
high side, allow the remainder to enter the
low side in small increments while operating
the unit.
12.Restart the unit several times after allowing
pressures to stabilize. Pinch off the process
tubes, cut and solder the ends. Remove the
pinch off tool, and leak check the process tube
ends.
SPECIAL PROCEDURES IN THE CASE OF
COMPRESSOR MOTOR BURNOUT
1. Recover all refrigerant and oil from the system.
2. Remove the compressor, capillary tube and
filter drier from the system.
3. Flush the evaporator, condenser and all
connecting tubing with dry nitrogen, or
equivalent, to remove all contamination from
the system. Inspect the suction and discharge
lines for carbon deposits. Remove and clean
if necessary.
4. Reassemble the system, including a new drier-
strainer and capillary tube.
5. Proceed with processing as outlined under
hermetic component replacement.
HERMETIC COMPONENT REPLACEMENT
The following procedure applies when replacing
components in the sealed refrigeration circuit or
repairing refrigerant leaks. (Compressor,
condenser, evaporator, capillary tube, refrigerant
leaks, etc.)
1. Recover the refrigerant from the system at the
process tube located on the high side of the
system by installing a line tap on the process
tube. Apply the gauge from the process tube
to EPA approved gauges from the process
tube to the EPA approved recovery system.
Recover the CFC’s in the system to at least
5%.
2. Cut the process tube below the pinch off in
the suction side of the compressor.
3. Connect the line from the nitrogen tank to the
suction process tube.
4. Drift dry nitrogen through the system and
unsolder the more distant connection first.
(Filter drier, high side process tube, etc.)
5. Replace the inoperative component, and
always install a new filter drier. Drift dry
nitrogen through the system when making
these connections.
6. Pressurize the system to 30 PSIG with proper
refrigerant and boost the refrigerant pressure
to 150 PSIG with dry nitrogen.
7. Leak test the complete system with the electric
halogen leak detector, correcting any leaks
found.
8. Reduce the system to zero gauge pressure.
9. Connect the vacuum pump to the high side
and low side of the system with deep vacuum
hoses, or copper tubing. (Do not use regular
hoses.)