GEA Grasso - Start-up and Switch-off Sequences

OPERATING INSTRUCTIONS
CO
2
/NH
3
CASCADE UNIT
250 - 1000 KW
40 _551511_om_kas_gbr_1_.doc
If repairs are necessary, contact the service
department of Grasso GmbH Refrigeration
Technology.
4 MAINTENANCE INSTRUCTION
4.1 General Information
Warning!
The CO /NH
2 3
cascade may only be serviced /
maintained by qualified operating personnel. These
maintenance instructions shall be adhered to during
all maintenance work. Moreover, all health & safety
and fire prevention regulations and the safety
regulations for refrigeration systems must also be
observed.
All service and maintenance work must
be carried out with care to ensure the
CO
/NH
2 3
cascade maintains its efficiency
and functional reliability.
Any guarantee
claims will be rejected if the customer
failed to follow the Maintenance
Instructions.
This maintenance manual contains the service
regulations and records (certificates) for the CO
2
/
NH
3
cascade's first 10 years of service. The
maintenance certificates are completed and signed
as part of the inspection and service / maintenance
by authorized fitters as evidence of the work done.
During the guarantee period these confirmed
maintenance certificates are also a precondition for
possible claims under the guarantee provided by
Grasso GmbH.
Caution!
Pay attention to maintenance manual!
every 24
Check weekly monthly Remarks
to 72hrs
Final discharge
temperature
X
Minimum superheat must not be lower than 25 K.
Maximum final discharge temperature 100°C.
See parameter list!
X
Oil temperature
The viscosity may not be less than 7 cSt at max.
speed.
Oil pressure
X
The oil pressure must be at least 0.5 bar above
the final discharge pressure, an oil pressure fault
may be caused by a clogged oil filter.
Final discharge pressure
X
See project value (parameter list). Determine the
superheat on the discharge side by comparison
with the final discharge temperature.
Oil level in oil separator
X
An oil level must be visible in the sight glass at all
times. If the oil level is below the bottom third of
the sight glass, recharge oil.
While compressor is stopped, the heater must
automatically start up. If the thermostatic cutout
(limiter) switches off the heater, this may be an
indication of an oil shortage.
X
Oil heater
Adjusting the safety
devices
X
See set values in the parameter list.