Oil Charge; Pressure Compensation With The Cooling System; Checking The Direction Of Rotation Of The Oil Pump Motor; Fig. 44 Oil Temperature Limiter - GEA Grasso M-Series Operating Manual

Start-up
fig.44: Oil temperature limiter
fig.45: Temperature controlled control valve
8.5.5

Oil charge

Caution!
Check the oil grade to be charged! See
contract/project or recommendation of
GEA Refrigeration Germany GmbH. A
comprehensive overview of the allowa-
ble oil types is provided in "Technical
information on lubricating oils". This
technical information is part of the
product documentation.
For severely hygroscopic oils, the oil
container must be placed under a pro-
tective atmosphere.
The vacuum present in the screw compressor pack-
age before pressure compensation may be utilised
for charging the package with oil. A separate oil
charging pump is required after the pressure com-
pensation and for refilling with oil.
The connection of the oil draining or oil charging stop
valve (090) must be connected with the oil charging
container.
Before charging with oil, switch the valves to the
operating position.
The stop valve (090) must be opened until the oil
level has reached a value between the upper edge of
the sight glass indicator MIN (N10b, data sheet
990565) and lower edge of the sight glass indicator
MAX (N10c, data sheet 990565).
The oil separator is generally charged with oil via the
oil cooler.
60
controlled autonomously using control element
Autonomous control via sensor
When charging with oil for the first time, oil must be
charged via the service valve (135) too. To this end,
the stop valve (065) must then be closed.
While operating the package, the oil level must be
regularly checked (see chapter "Oil level check").
8.5.5.1
Re-establish the vacuum. Carry out pressure com-
pensation via the service stop valve (285).
8.5.5.2
The oil pump is started with the driving motor electri-
cally blocked (service). The stop valves are in the
operating position.
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
Caution!
Due to the use of selected compo-
nents, the refrigerating machine oils
tend to absorb more moisture. There-
fore, when charging a compressor the
oil should be allowed to come into
contact with air for a short time only.
The contents of an opened drum have
to be used up within one working day,
provided the drum is properly closed
between charging.
Pressure compensation with
the cooling system
Checking the direction of rota-
tion of the oil pump motor