A2 PREPARATIONS FOR USE
After the Compressor (Package) has been installed
(excl. final connection of drive device), the
following actions should be followed in the order
given:
A2.1 Leak test of compressor and system
The compressor (package) has been pressure
tested prior to leaving the factory. In case an
additional leak test is required, this test is should
be carried out with dry nitrogen under pressure
up to a max. of 10 bar(a).
Do NOT add oil to the compressor prior
to pressure testing.
A system leak test should be carried out over 24
hours to ensure that the system is tightly sealed.
Record during the pressure test, the pressure,
ambient temperature and outside temperature.
During the initial 6 hours a pressure drop of 2% is
permissable. With respect to temperature
variations, no further pressure loss should be
detected in the remaining 18 hours.
If the test pressure has not decreased by more
than 5% the system can be considered leak free.
A2.2 Evacuation/drying the refrigerating system
For evacuation of compressor only, refer to §B5.
Procedure to evacuate and to dry a system:
a) STATUS: System is filled with nitrogen (refer to
§A2.1) and no oil into the system (oil prevents any
trapped moisture from boiling off).
b) Verify that all valves in that part of the system to be
evacuated are opened (refer also to the plant
manual).
c) Connect vacuum pump to the evacuation/purging
valve(s) of the compressor (for location of these
valves refer to the "Engineering Data" or to a
connection as mentioned in the plant manual and
evacuate the system to approx.
5 mm Hg (=6.6 mBar).
d) Break vacuum by charging dry nitrogen into the
system.
e) Repeat step ’c’.
f) Wait approx. 24 hours.
g) If pressure has been increased (system still contains
moisture), repeat steps ’d’, ’e’ and ’f’, otherwise,
continue with the "Initial oil charge" procedure
§A2.3.
A2.3 Initial oil charge
Used or filtered oil should NEVER BE
added to a compressor under any
circumstance.
Use only new oil to be selected from the
oil table (see "Engineering Data").
a) STATUS: System is dried and still evacuated (refer to
§A2.2).
b) Close suction and discharge stop valves of
compressor and oil return line of oil separator
(if present).
c) Fill the compressor crankcase with oil (for oil
quantity see table overleaf) via the oil charge/ drain
valve (for location of this valve refer to the
"Engineering Data").
d) Open evacuation/purging valve(s) of the
compressor (for location of these valves refer to the
"Engineering Data") to bring the compressor to
atmospheric pressure.
e) Fill the following components with oil as given in
the table on the next page with/without pre-
lubrication valves (explained hereafter) :
- Shaft seal housing via the oil filling opening.
- Oil pump housing via the oil filling opening.
- Oil suction and discharge filter housings via the oil
filling openings.
Refrigeration Division
Grasso
A: INSTALLATION AND PREPARATIONS FOR USE
v001.99.01.en Installation and Maintenance Manual RC(U)6 A2.1
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