Parameter to be
checked
Every 24
to 72hrs
Weekly
Monthly
Remark
Discharge temperature
X
Minimum superheat must not be less than 15 K
for NH
3
. For other refrigerants, the manufactur-
er's instructions must be noted.
Maximum discharge temperature 100°C, in indi-
vidual cases (e.g. heat pump applications) this
may be exceeded in agreement with the manu-
facturer.
Oil temperature
X
See parameter list!
The viscosity must not be less than 7 cSt at
max. speed (rpm).
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. Set-
ting and monitoring of the values in accordance
with the information in the parameter list.
Discharge pressure
X
See project value (parameter list). Determine
the superheat on the pressure side by compari-
son with the final discharge temperature.
Oil level in oil separa-
tor
X
See chapter "Oil level check". An oil level must
be visible in the sight glasses at all times. If the
oil level is below the minimum value, the oil
must be recharged.
Oil heater
X
When compressor is shut down, the heater
must automatically start. Visual check, the
green LED indicates "Voltage ON".
Setting the safety devi-
ces
X
See set values in the parameter list.
Capacity control
X
Solenoid valves must switch audibly when the
capacity is adjusted. Check in operating mode
"1 ( manual)“.
Number of operating
hours
X
See maintenance checklist for maintenance
work to be carried out according to the number
of operating hours.
10.4.4.21
Maintenance of the switching
cabinet
Terminal screws must be checked for tightness and,
if necessary, tightened at regular intervals (every
5,000 operating hours or at least once per year). The
Cleaning, maintenance, repair
Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
82
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Summary of Contents for Grasso M-Series
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