York YS Service Manual download pdf (Page 45)

7.4 Oil Filters and Strainers

The oil return system ensures that oil removed from the

discharge gas by the oil separator and oil reaching the

evaporator are returned to the compressor effectively.

The return system is in three sections, each with its own

strainer/filter elements:

7.4.1 Separator Oil Return (First Stage)

The oil return from the first stage of the oil separator

reservoir is fitted with twin replaceable cartridge filters. A

change over valve system keeps one filter in operation

and one on stand-by. The stand-by filter element can be

cleaned/ changed whilst the unit is in operation.

To replace the filter proceed as follows:

1. Check commuter valve is closed (in).

2. Each filter is equipped with a small valve which

should be used to relieve the pressure within the

filter via a suitable refrigerant recovery unit. Relieve

the pressure slowly and carefully.

3. Use a spanner on the hexagonal boss on the

bottom of the housing to remove the filter element.

Inspect the element for foreign materials and,

provided none are found, discard the filter element.

Clean the inside of the housing and install a new

filter element. Reinstall the filter on the unit.

4. Evacuated the air from the filter via the small valve

mounted on the filter.

5. Open commuter valve (out one or two turns only) to

fill element with oil then re-close commuter valve .

7.4.2 Oil Return (Secondary Stage)

The oil return from the second stage of the oil separator

is fitted with a single strainer between the separator and

the restrictor orifice.

To replace the strainer proceed as follows:

1. Close the stop valves on both sides of the strainer.

2. Check each eductor orifice is clear.

3. Replace filter.

4. Purge lines then open all stop valves.

7.4.3 Evaporator Oil Return (Eductors)

High pressure condenser gas flows continuously

through two eductors mounted on top of the evaporator

inducing the low pressure, oil rich liquid to flow from the

evaporator, through the strainer to the compressor

suction.

To replace the strainer proceed as follows:

1. Close the stop valves on both sides of the eductor /

strainer assembly.

2. Carefully remove thermal insulation from around

strainers and eductor block as necessary.

3. Check each eductor orifice is clear.

4. Replace filter.

5. Purge lines then open all stop valves.

6. Replace thermal insulation using suitable

insulation adhesive.

7.5 Oil Charging

S2, and S3 compressors require approximately 38 litres

of oil and S4 and S5 compressors require approximately

76 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.

035L02381-GB0 7-3

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York YS Service Manual Page 45

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