5| Compressor assembly
When the compressor is at a standstill, refrigerant diffuses into the lubrication oil of the compressor
housing, depending on pressure and ambient temperature. This reduces the lubrication capacity of
the oil. When the compressor starts up, the refrigerant contained in the oil evaporates out through
the reduction in pressure. The consepuences can be lack of lubrication, foaming and migration of the
oil, which can eventually lead to compressor damage.
To prevent this, the oil can be heated via an oil sump heater.
Operation:
Oil sump heater ON at standstill of the compressor.
Oil sump heater OFF during operation of the compressor
Connection: Oil sump heater must be connected via an auxiliary contact (or parallel wired
auxiliary contact) of the motor contactor to a separate electric circuit.
5.9 Oil sump heating
WARNING! The oil sump heater must not be connected to the electrical circuit
of the safety control chain !
Oil sump heater: 230 V – 1 – 50/60Hz, IP65
Type
F2 F3 F4 F5 F14 F16
Electrical power
(Watt)
40 60 80 80 140 140
INFO! Same electrical performance even on NH
3
compressors
NH
3
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