Technical data

7.4 Oil Filters and Driers
A single oil filter is provided as standard equipment and
dual oil filter arrangements are available as optional
equipment. The oil filter(s) are a replaceable 3 micron
cartridge type oil filter. Use only YORK approved oil filter
elements.
The oil filter element should be changed after the first
200 hours of operation and then as necessary
thereafter. Change the oil filter element before the
differential pressure reaches 1 bar. Always replace the
oil filter element and O-ring on a yearly maintenance
schedule.
The YORK control panel will automatically display the
message WARNING - OIL - DIRTY FILTER when the
differential pressure reaches 138 kPa across the oil
filter.A safety shutdown will be initiated if the oil pressure
differential pressure reaches 172.5 kPa. The control
panel will display the message OIL - CLOGGED
FILTER.
The filter driers should be changed annually or when
excessive amount of oil is indicated in the refrigerant
charge.
7.4.1 Single Oil Filter Replacement
The chiller must be OFF. Turn the rocker switch to the
OFF position; turn the circuit breaker to the off position to
prevent the chiller from being accidentally started.
1. Close the hand isolation valves on the inlet and
outlet oil lines going to and from the oil filter.
2. Relieve the refrigerant pressure and oil in the oil
filter and the oil lines through the pressure access
port fitting, located on the top of the filter housing.
Connect a refrigeration pressure hose to the
pressure access port and drain the oil and
refrigerant into a suitable refrigerant recovery
container.
3. Position a container to collect the oil (less than 1.9
litres). Loosen and remove the drain nut at the
bottom of the oil filter housing; drain the oil into the
container.
4. Unscrew the oil filter bowl locking nut.
5. Remove the oil filter element.
6. Install a new element.
7. Install a new O-ring on the top of the oil filter bowl.
8. Tighten the oil filter bowl locking nut.
9. Evacuate the air from the oil filter to 500 microns
PSIG.
10. Open the hand isolation valves.
11. The chiller is ready to be restarted.
7.4.2 Dual Oil Filters
The dual oil filter option allows one oil filter to be isolated
and changed with the chiller in operation.
1. Open the hand isolation valves on the idle filter.
2. Close the hand isolation valves on the filter to be
changed.
3. Follow the instructions for changing the single oil
filter beginning at step 2.
4. This can now be the idle filter and the chiller can be
operated with the current oil filter.
7.4.3 Filter Drier Replacement
When the filter driers require changing the chiller must
be shut off.
1. Close the service isolation valves identified in
schematic drawing, see Figure 2.2.
2. Carefully remove the insulation on the filter driers
located on the eductor block.
3. Relieve the pressure from the circuit using the
pressure access fitting located on the side of the
eductor block. Connect a refrigeration pressure
hose to the pressure access port and drain the oil
and refrigerant into a suitable refrigerant recovery
container.
7-4 160.81-ICOM-GB0 (01/02)
FILTER
DRIER
FILTER
DRIER
FILTER DRIER
OIL
EDUCTOR
BLOCK
OIL FILTER
Figure 7.1 Filters and Filter Driers