Maintenance; Oil Change; Internal Pressure Relief Valve - Bitzer 2KES-05 Instructions De Service

this case it's recommended to coat the terminal plate
and terminals with contact grease (e.g. Shell Vaseline
8401, contact grease 6432, or equivalent).
Furthermore for the compressors
• 2KES-05(Y) .. 2FES-3(Y)
• 2EES-2(Y) .. 2CES-4(Y)
Fig. 23: Drain plug for condensation water on the terminal box

8 Maintenance

8.1 Oil change

Oil change is not compulsory for factory-made systems.
In the case of "field installations" or operation near ap-
plication limits, it is recommended to change the oil for
the first time after approx. 100 operating hours. During
oil change, also clean oil filters and magnetic plugs (for
compressors with integrated oil pump).
After that, change the oil and clean oil filters and mag-
netic plugs approximately every 3 years or 10,000 ..
12,000 operating hours. Oil types: see table 1, page 5
and see table 2, page 5.
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!
KB-104-7
• 4FES-3(Y) .. 4BES-9(Y)
• 4FDC-5Y .. 4CDC-9Y
the condensing water may be drained by permanently
removing the drain plug (see figure 23, page 25).
If the drain plug is removed, the enclosure class of the
terminal box drops from IP65 to IP54!
When using A2L refrigerants
WARNING
Risk of refrigerant evaporation from the used oil.
Increased risk with A2L refrigerants due to flam-
mability!
Used oil may still contain relatively high percent-
ages of dissolved refrigerant even at atmo-
spheric pressure.
Transport and storage Fill used oil into a pres-
sure-resistant vessel. Store under a nitrogen at-
mosphere (holding charge).
Dispose of waste oil properly!

8.2 Internal pressure relief valve

One pressure relief valve each built into:
• 4NE-14.F3Y and 4NE-20.F4Y
• 4JE-13Y .. 4FE-35(Y)
• 6JE-22Y .. 6FE-50(Y)
2 pressure relief valves each built into:
• 8GE-50(Y) .. 8FE-70(Y)
The valves are maintenance-free.
However, after repeated venting, it may leak perman-
ently because of abnormal operating conditions. The
25