035-19569-101 (0109)
7-3
GB
7.3 Oil Charge
The nominal oil charge for the compressor is 75.7 litres,
of York “K” oil. Only York “K” refrigeration oil must be
used in the centrifugal compressor. Since oil absorbs
moisture when exposed to the atmosphere, it should be
kept tightly capped until used.
7.3.1 Oil Charging Procedure
The compressor oil level must be maintained between
the oil reservoir’s upper and lower sight glasses. If the
oil level falls into the lower sight glass, it is necessary to
add oil to the compressor oil reservoir. The oil should be
charged into the oil reservoir using the an oil charging
pump(Part No. 070-10654). To charge oil into the oil
reservoir, proceed as follows:
1. The unit must be shut down.
2. Immerse the suction connection of the oil charging
pump in a clean container of new oil and connect the
pump discharge connection to the oil charging valve
(A) located on the oil reservoir cover plate. (fi gure
7.2). Do not tighten the connection at the charging
valve until after the air is forced out by pumping a few
strokes of the oil pump. This fi lls the lines with oil and
prevents air from being pumped into the system.
3. Open the oil charging valve and pump oil into the
system until oil level in the compressor oil reservoir
is about midway in the upper sight glass. Then,
close the charging valve and disconnect the hand
oil pump.
4. As soon as oil charging is complete, restore the power
supply to energise the oil heater. This will keep the
concentration of refrigerant in the oil to a minimum.
CAUTION
When the oil reservoir is initially charged with
oil, the oil pump should be started manually to
fi ll the lines, passages, oil cooler and oil fi lter.
This will lower the oil level in the reservoir. It will
then be necessary to add oil to bring the level
back to the centre of the upper sight glass.
7.4 Refrigerant Charge
The refrigerant system is pressure tested and evacuated
at the factory.
7.4.1 Checking The Refrigerant Charge
The refrigerant level should have been observed
and the level recorded after initial charging. With
the correct charge the level should visible in the
sight glass.
NOTE
The refrigerant charge should always be
checked and trimmed when the system is shut
down.
The refrigerant charge level must be checked after the
pressure and temperature have equalised between the
condenser and evaporator. This would be expected
to be 4 hours or more after the compressor and water
pumps are stopped.
Figure 7.2 Oil Reservoir Charging
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