5.4 STOPPING THE COMPRESSOR PACKAGE
The compressor package can be stopped at any moment
desired.
Consult the contractors plant operation rnanual tor turther
action required, especially
in the case of manually control
led plants.
5.5 AFTER START-UP MAINTENANCE
Atter the compressor has run for twenty-four hours, clean
the suction straïner, oil strainers and change the oil filter lf
its pressure drops exceeds 1 bar.
Check the compressor shaft seal for excessive leakage of
more than 10 drops per minute. lf excessive, replace the
seal as in paragraph 7.5.
IMPORTANT
Whenever the compressor stops, it runs in the reverse direc
tion tor severaJ seconds.
After the disçharge check valve clases, the high pressute
refrigerant in the oi/ separator expaonds back through the
compressor to the closed suction check valve which causes
the compressor to run. in reverse. lt
is
a complete/y normal
action and
is
no cause for alarm.
Continued back spin tor more than 5 seconds indicates ex
cess
leaké]ge through the check valves.
5.6 STEPS FOR LONGER SHUT-DOWN PERIODS
The compressor operates witt, an oillrefrigerant mixture,
and therefore short shut-down periods will not affect the
compressor operation.
To shut down a compressor tor long term period, tightly
shut both the suction and discharge stop valves and the
economizer stop valve (it fitted wi1h economizer)_ Discon
nect the power source from the compressor drive motor and
the efectrical control cabinet
Place a moisture absorbing compound (eg a dessicant such
as silica gel) inside the control cabinet and the electric valve
actuator.
Place warning tags on the electric system and all closed
stop valves. These who do not know the machine is shut
down fora long term must not attempt to start the com
pressor until it is ready for normal operation.
lt wi/1 be sufficient to start-up-after opening the discharge
stop valve. As soon as the compressor has reached ,its
maximum speed, the discharge stop valve can be closed
again after stopping the compressor
REMARK
Every month While the compressor
is
shut down. tum the
compressor and motor over several turns.
Du ring a shut-down period under cold weather conditions,
the water cooled parts of the plant should be drained or the
coo/ing water circulation maintained in order to prevent dam
age due to trost.
Prior to starting up after a shut down, change the oil and
pump down the compressor.
Before pushing the start button, check tt,at the oil in the sep
arator sump is above 20
·c
i[see item e) in paragraph 5.2J.
Page 5.2
Compressor Package GSLP
92.01
