GEA Bock HGX2 CO2 T - Manual (Page 17)

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Operation mode: The oil sump heater operates when the compressor is shut down.
The oil sump heater is switched off when the compressor starts.
Connexion: The oil sump heater must be connected via an auxiliary contact (or parallel wired auxiliary
contact) of the compressor contactor to a seperate electric circuit.
Electrical data: 110 - 240 V - 1 - 50/60 Hz, 50 - 120 W, PTC-heater adjusting.
5 | Electrical connection
The compressor and the trigger unit MP10 are operational when the H3 LED (green) lights.
5.6 Function test of the trigger unit MP 10
Pos Procedure
LED H1 LED H2 LED H3
red red green
1 • Interrupt power supply (L1 or S1) OFF OFF OFF
• Release the motor temperature sensor connection (1 or 2)
• Release the hot gas temperature sensor (if installed) (3 or 4)
2 • Restore the power supply (L1 or S1) ON
• Function check of motor temperature sensor: operational ON
• Function check of hot gas temperature sensor: operational ON
3 • Interrupt power supply again (L1 or S1) OFF OFF OFF
• Reconnect terminals 1 or 2 and/or 3 or 4
4 • Restore the power supply (L1 or S1): OFF OFF ON
• MP 10 is operational again
Before start-up, troubleshooting or making changes to the control power circuit, check the functionality
of the trigger unit:
ATTENTION! The oil sump heater must generally be connected and operated.
5.7 Oil sump heater (accessories)
In order to avoid damage to the compressor, the compressor must be equipped with an oil sump
heater.