GEA Grasso M-Series Operating Manual Download

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Hint!

The maintenance works on the screw
compressor are described in the
installation manual of the compressor.

After 50,000 operating hours or in the 15th operating
year, a general check of the screw compressor is
planned by the manufacturer. Contact Customer
Service in this regard.

10.4.4.2

Changing the block mounting
filter element

Hint!

When must the filter element be
replaced or cleaned?
The oil filter element must be replaced
as specified in the maintenance check-
list for the total product from GEA
Refrigeration Germany GmbH.
Loss in pressure during operation is
monitored by the internal control –
including a preliminary alarm function
for preventative replacement.
The following applies as a guide value
for replacement: The filter element
should be replaced after every 5000
operating hours or once each year.

Changing the filter element

1. Shut down the screw compressor package/chiller

and depressurise the blocked mounting filter on
the pressure side.

2. Remove the filter cover by loosening the four

cover screws.

3. Remove the filter element by slightly turning the

mounting pin in the filter head.

4. Check the O-ring and support ring in the filter

bowl for damage and correct positioning.
Replace parts if required.

5. Replace glass fibre element, clean or replace

wire mesh.
The efficiency of the cleaning depends on the
type of dirt and the level of differential pressure
before replacing the filter element. If, after
replacing the filter element, the differential pres-
sure is more than 50% of the value before
replacing the filter element, wire mesh must also
be replaced.

6. Check that the type designation/manufacturer ID

number on the replacement element matches
the type designation/ID number on the filter’s rat-
ing plate.

7. Place the replaced or cleaned filter element back

on the mounting pin by turning it slightly.

8. Reposition the filter cover and tighten the four

cover screws. Ensure that installation occurs
without mechanical tension.

9. Vent the housing of the block mounting filter.

10.4.4.3

Replacing the oil filter

1. Switch the unit/ chiller off.

2. If the oil filter is very dirty, it may be necessary to

replace it outside the normal maintenance
schedule.

3. To change the oil filter insert, close the following

valves in accordance with the P+I diagram and
the oil filter documentation:

–

Stop valve in front of oil filter (item 65)

–

further stop valves in front of oil filter (if avail-
able), e.g. (item 220) if a thermostatic 3-way
valve (item 215) will be used

see P&I diagram

–

Stop valve function oil (item 70) for Grasso
SP1 or (item 190) for Grasso SPduo

–

Control valve - injection oil with integrated
check valve function (item 80)
Do not forget to note the number of valve
rotations when you close the valve (item
080). When opening the valve it must be
returned to its initial position (see point 10).
This is necessary to ensure the final temper-
ature remains unchanged and therefore to
avoid possible vibrations in the oil line.

–

Stop valve bypass oil cooler (optional)

4. Establish pressure compensation with the

atmospheric pressure.

5. Drain oil.

6. Remove the cover of the oil filter.

7. Remove the oil filter element and properly dis-

pose of it if it is highly soiled.

8. Carefully insert a new oil filter element.

9. Close the cover of the oil filter.

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages

Cleaning, maintenance, repair