Champion ci 40 - Protection Devices; Thermo Bypass-Valve

Champion Compressors Ltd. Manual No. 975203 Rev H
18
8.4 Protection Devices
The Dominator range is protected by a high oil temperature switch (set at
100°C) and a motor thermal overload (settings detailed in Section 6). On the
Stop / Start models, the temperature switch trips the motor overload (located
in the pressure switch) and this requires manual resetting (switch off / switch
on). The Star-delta, CSU models’ temperature switch disconnects power from
the starter coils, stopping the compressor. The temperature switch will
automatically reset once the unit has cooled down. The Star-delta, CSU
models motor overload (located in the enclosure) once tripped, must be
manually reset. After any fault, the Off/Auto switch must be toggled to start
the compressor.
In all instances of compressor stopping due to a protection trip, urgent
action must be taken to rectify the fault prior to the compressor being
restarted.
8.5 Thermo Bypass-Valve
All the Dominator series compressors are fitted with thermo bypass valves.
This valve insures optimum oil temperature (approx. 70°C) during periods of
low load cycles or on cold days. This valve will prevent excessive
condensation build up in the oil. For export machines, an 80ºC thermoslide
may be fitted to reduce water condensation in humid environments.