Thermo King CRR-40 119, Руководство пользователя

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Refrigeration Maintenance and Service Operations
127
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
counterclockwise to withdraw the fitting stem
from the discharge line port valve. Then open
both service manifold valves to center port.
2. Close the liquid line service 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. Open liquid line service valve and cap valve
stem.
7. Secure all manifold lines to manifold hose
anchors when the manifold is not in use.
Checking Compressor Oil
The compressor oil should be checked during
pretrip inspections 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.
To check compressor oil level with an
ambient air temperature below 10 C (50 F)
With the evaporator temperature below 10 C (50
F), initiate a Manual Defrost to operate the unit
through a complete DEFROST CYCLE. After
completing the defrost cycle, operate the unit on
COOL for a few minutes. After 2 to 3 minutes,
observe the oil level. The oil should be 1/2 to 3/4
up in the sight glass.
If the container is empty, you can operate the unit
on the heat cycle instead of the defrost cycle.
Adding Compressor Oil
1. Install gauge manifold set (refer to “Gauge
Manifold Set Attachment and Purging”).
Pump the compressor down (refer to “Low
Side Pump Down”).
CAUTION: Use ONLY Polyol Ester based
refrigeration compressor oil, P/N 203-433.
DO NOT mix Polyol Ester based and
standard synthetic compressor oils.
CAUTION: Rubber gloves are
recommended when handling Ester based
compressor oil.
CAUTION: Keep Polyol Ester based
compressor oil in tightly sealed containers.
If Ester based oil becomes contaminated
with moisture or standard oils, dispose of
properly-DO NOT USE!
1. Add and remove compressor oil at
the compressor oil fitting
Figure 39: Adjusting Compressor Oil Level
AJA1308