Technical data

4. Loosen the Rota-Lock
®
Nuts at each end of the filter
driers. Remove the filter driers.
5. Teflon
®
seal washers are used to seal the filter drier
connections. These washers must be replaced
when the filter driers are replaced.
6. Tighten the Rota-Lock
®
Nuts at each end of the
three filter driers to a torque of 60 ft.-lb.
7. Evacuate the air from the oil filter to 500 microns
PSIG.
8. Open the five hand isolation valves. The chiller is
now ready to be placed back into service.
7.5 Oil Charging
T0 and T1 compressors require approximately 41 litres
of oil. The actual amount of oil required depends on the
compressor/ separator combination and the condition of
the refrigerant. The actual operating level in the
separator should be kept from exceeding the top of the
highest sight port. All units use York Grade 'H' oil.
7.5.1 Oil charging procedure
The oil should be charged into the oil separator using the
York Oil Charging Pump (Part No. 070- 10654).
To charge oil proceed as follows:
1. If the oil charging is to restore the correct oil level
the unit may be kept in operation. If the oil charge is
being replaced the unit must be shut down and the
supply switched off to prevent operation of the oil
heater.
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. 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 fills 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 oil separator is about
midway in the upper sight glass. Then, close the
charging valve and disconnect the hand oil pump.
4. The immersion oil heater will maintain the oil
temperature between 40°C and 46°C.
Draining the oil
1. If the oil draining is to restore the correct oil level the
unit may be kept in operation. If the oil charge is
being replaced the unit must be shut down and the
supply switched off to prevent operation of the oil
heater.
2. If possible run the unit at full load for a short period
to recover most of the oil in the system to the oil
separator.
3. Drain the oil into a suitable container from the oil
charging valve on the bottom of the oil separator.
4. Dispose of old oil according to local regulations for
the disposal of oily wastes.
7.6 Refrigerant Charge
The refrigerant system is pressure tested and
evacuated at the factory.
7.6.1 Checking The Refrigerant Charge
See para. 7.1.1.
7.6.2 Leak Testing
After the system has been charged, the system should
be carefully leak tested with a R134a compatible leak
detector to ensure all joints are tight.
If any leaks are indicated, they must be repaired
immediately.Usually, leaks can be stopped by tightening
flare nuts or flange bolts. However, for any major repair,
the refrigerant charge must be removed.
160.81-ICOM-GB0 (01/02) 7-5
Figure 7.2 Charging Oil