Operation; Regular Checks; Maintenance; Oil Change - Bitzer ORBIT 6 GSD60120 Instructions De Service

– Stable operating mode under all operating and
load conditions (also part-load, summer/winter op-
eration, minimum speed during VSD operation).
– Solid liquid at the expansion valve inlet.
• Avoid refrigerant migration (from the high-pressure
side to the low-pressure side or into the compressor)
during long shut-off periods!
– Install the solenoid valve in the liquid line.
– Automatic pump down system before any off
cycle (especially if the evaporator may get warmer
than the suction line or the compressor) as long
as the pressures are within the application limits.
– Install a sufficiently sized suction accumulator to
prevent liquid slugging during liquid floodback
when starting the compressor.
– Observe the low-pressure limit.
– Automatic sequence change for systems with sev-
eral refrigerating circuits.
– An oil heater is generally recommended, but must
be used in the following applications and under
the following conditions: Systems with reverse
cycling (e.g. hot gas defrosting), outdoor installa-
tion and in cases in which the compressor can be-
come colder than other system components. Split
systems equipped with extended pipe work.
– Switch the oil heater on at least 12 hours before
starting the compressor. This prevents oil dilution
and bearing load when starting the compressor
for the first time. The oil heater must be energized
during off cycles.
• For reverse cycling
– First switch the compressor off
– Wait for 30 seconds
– Then start the compressor

7 Operation

7.1 Regular checks

Examine the system at regular intervals according to
national regulations.
• Cleanness and traces of corrosion on the com-
pressor housing.
• Operating data, see chapter Checking the operating
data, page 17.
18
• Oil supply, see chapter Lubrication / oil level monitor-
ing, page 17.
• Safety and protection devices and all components
for compressor monitoring, see chapter Protection
devices, page 14 and see chapter Compressor start,
page 17.
• Tight seat of electrical cable connections and
screwed joints.
• Refrigerant charge.
• Tightness
• Prepare data protocol.

8 Maintenance

8.1 Oil change

The oil used by BITZER (see chapter Application
ranges, page 5) is characterised by its high degree of
stability. An oil change is generally not required when
appropriate suction-side fine filters are mounted or
used.
In case of compressor or motor damage, it is recom-
mended performing an acid test. If necessary, carry out
cleaning measures: Fit an acid retaining suction line
gas filter and change oil. If necessary, change filter and
oil again after several operating hours.
Compressors of the ORBIT series can be used as re-
placement compressor in systems, which have previ-
ously been operated with compressors with POE
charge. Provided that the correct compressors and di-
mensions have been selected, a residual oil content of
up to 10% is allowed in the system.
WARNING
The compressor is under pressure!
Serious injuries are possible.
Depressurize the compressor!
Wear safety goggles!
NOTICE
!
!
Damage to the compressor caused by degraded
BVC oil.
Moisture is chemically bound to the oil and can-
not be removed by evacuation.
Proceed with extreme care:
Any penetration of air into the system and oil
drum must be avoided under all circumstances.
Use only oil drums in their original unopened
state!
Dispose of waste oil properly!
ESB-130-7