CRR-20 & CRR-40, September 1999
Refrigeration Maintenance and Service Operations
Checking Compressor Oil
6-5
7.
Close the suction service manifold hand valve fully to
center port.
8.
Attach high side hose (pressure gauge) to the discharge
service line port.
9.
Open discharge service manifold hand valve fully. Then
rotate discharge fitting hand wheel clockwise to open
(depress) discharge line port valve to the high hose.
10. Slowly screw a 1/2 inch ACME fitting into the manifold’s
service (center) line to purge the high and service hoses.
Remove ACME fitting after purging.
11. Close discharge service manifold hand valve fully to cen-
ter port. You are now ready to use the gauge manifold to
check system pressures or perform MOST service proce-
dures.
NOTE: These gauges may be removed and rein-
stalled without additional purging so long as a
slight positive pressure remains in the manifold
and hoses when removed from the unit.
Gauge Manifold Set Removal
NOTE: To ensure minimum refrigerant release to the
atmosphere, THE SYSTEM SHOULD BE RUNNING.
However, this is not possible in all cases, but the
same procedure should be followed.
1.
Rotate discharge hose fitting hand wheel counterclock-
wise to withdraw the fitting stem from the discharge line
port valve. Then open both service manifold valves to
center port.
2.
Close the receiver tank outlet valve and pump down the
low side. Then turn the unit OFF.
3.
Rotate the discharge fitting hand wheel counterclockwise
to depress the port valve stem to equalize pressure at 21
kPa, 0.21 bar, 3 psig.
4.
Rotate both coupler hand wheels counterclockwise to
close (seal) the valve port stems to the high and low hoses.
5.
Remove the gauge lines from the suction and discharge
service fittings and cap the service ports.
6.
Back seat receiver tank outlet valve and cap valve stem.
7.
Secure all manifold lines to manifold hose anchors when
the manifold is not in use.
Checking Compressor Oil
CAUTION:
• Use ONLY Polyol Ester based refrigeration com-
pressor oil, P/N 203-433.
• DO NOT mix Polyol Ester based and standard syn-
thetic compressor oils.
• Rubber gloves are recommended when handling
Ester based compressor oil.
• Keep Polyol Ester based compressor oil in tightly
sealed containers. If Ester based oil becomes cont-
aminated with moisture or standard oils, dispose of
properly — DO NOT USE!
The compressor oil should be checked during pretrip inspec-
tions and when there is evidence of oil loss (oil leaks) or when
components in the refrigeration system have been removed for
service or replacement.
To check compressor oil level with an ambient air
temperature above 10 C (50 F)
Install gauge manifold on the compressor. Operate the unit on
COOL with a 138 kPa, 1.38 bar, 20 psig minimum suction
pressure and a 689 kPa, 6.89 bar, 100 psig discharge pressure
for 15 minutes or more. After the unit has maintained the
above conditions for 15 minutes, observe the compressor oil
level. The oil should be 1/2 to 3/4 up in the sight glass.
Adjusting Compressor Oil Level
1. Add and Remove Compressor Oil at the Compressor
Oil Fitting
Summary of Contents for CRR-20
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