SB-160-3
22
7
Operation
7.1
Regular tests
Check the system at regular intervals according to na-
tional regulations. Check the following points:
• Operating data, see chapter Compressor start, page
20.
• Read out the data logged by the FI control.
• Oil supply, see chapter Compressor start, page 20.
• Safety and protection devices and all components
for compressor monitoring (check valves, discharge
gas temperature sensors, differential oil pressure
limiters, pressure limiters, etc.).
• Tight seat of electrical cable connections and
screwed joints.
• Screw tightening torques (see SW-100).
• Refrigerant charge.
• Tightness.
• Check the system over the complete speed range
again to detect any abnormal vibration.
• Prepare data protocol.
7.2
Moisture
For applications with high humidity, low suction gas su-
perheat and/or insufficient sealing of the cable bush-
ings, moisture may form in the FI housing. In this case,
it is possible to drain the moisture by removing the
drain plugs.
Fig. 13: Drain plugs for moisture on the FI housing
When the drain plugs are removed, the enclosure class
of the FI housing changes from IP54 to IP22.
8
Maintenance
Observe the supporting documentation of the new com-
ponents!
8.1
Oil change
!
!
NOTICE
Damage to the compressor caused by degraded
ester oil.
Moisture is chemically bound to the ester oil and
cannot 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!
The listed oils, see chapter application ranges, page
13, are characterised by their high degree of stability.
An oil change is generally not required when appropri-
ate suction-side fine filters are mounted or used. In
case of compressor or motor damage, it is recommen-
ded performing an acid test. If necessary, carry out
cleaning measures: Mount a (bi-directional) acid-retain-
ing suction line gas filter and change the oil. Purge the
system on the highest point of the discharge side and
collect the refrigerant in a recycling cylinder. If neces-
sary, change filter and oil again after several operating
hours and purge the system.
Changing the oil
If oil change is needed, it is recommended replacing
the oil filter as well, see below.
WARNING
The compressor is under pressure!
Serious injuries are possible.
Depressurize the compressor!
Wear safety goggles!
• Drain the oil from the compressor and the motor
housing. Oil draining positions on the compressor
are connection positions 5 and 6, see chapter Con-
nections and dimensional drawings, page 13.
• Charge with new oil.
• Dispose of waste oil properly.
