Maintenance Of The Suction Filter; Oil Draining, Oil Filling, Oil Change - GEA Grasso M-Series Operating Manual

Cleaning, maintenance, repair
10. Reopen valves in accordance with item 3. The
valve (80) must be returned to its initial position.
11. After the pressure has been compensated, vent
the oil filter via the vent valve.
10.4.4.4 Maintenance of the suction fil-
ter
10.4.4.4.1 Changing the filter element
The maintenance interval for changing or cleaning
the filter element is specified by the manufacturer of
the refrigeration system.
The contamination level and mechanical condition of
the filter element must be inspected at least once a
year.
Before opening the filter, always make sure the filter
housing is not under pressure.
Caution!
Refrigerant may leak out on opening
the filter. The safety data sheets for
the refrigerants in question must be
consulted and any prescribed protec-
tive measures observed.
To remove the element, proceed as follows:
1. Unscrew the cover.
2. Pull out the cover with the filter element.
3. Remove the spring wire clamp.
4. Twist the element away from the cover to
release the bayonet catch.
5. Detach the element from the cover.
6. Allow the element to drain off into a suitable con-
tainer.
Caution!
When carrying out maintenance,
always inspect the sealing ring (O-
ring) of the cover for mechanical dam-
age and replace it if necessary.
7. Reassemble all parts with the new or cleaned fil-
ter element following the same procedure in
reverse order.
76
10.4.4.4.2
The metal-gauze element used in the filter can be
cleaned and reused several times before it has to be
changed.
Manual cleaning
Immerse the soiled metal-gauze element in a clean,
grease-dissolving liquid, then blow it through with
compressed air from the outside inwards. Here it is
important to place a cylindrical part – possibly wrap-
ped in corrugated cardboard – inside the element to
catch the dirt particles.
Caution!
Never use wire brushes for cleaning.
Hint!
To avoid fatigue failures of the metal
gauze, strainer elements should be
replaced with new, original filter ele-
ments after being cleaned 4 – 5 times.
10.4.4.5 Oil draining, oil filling, oil
change
10.4.4.5.1
Aged oil demonstrates an increasing loss of ability to
lubricate. Because of this, all rotating components of
the compressor are endangered. The filter elements
become prematurely clogged and must be cleaned
and replaced at shorter intervals.
The oil in the screw compressor package/chiller must
be changed:
–
when the operating time of the oil charge has
reached the technically specified oil change
interval,
Warning!
Oil change intervals
Oil change with ammonia as the refrig-
erant after every 5,000operating hours
or after 1 year at the latest.
Oil change with freon as the refrig-
erant after 10,000operating hours or
after 2 years at the latest.
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
Cleaning the filter element
Importance of oil change