GEA Bock HGX46 CO2 T - Manual (Page 27)

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5| Electrical connection
5.8 Function test of the trigger unit MP 10
Operation: The oil sump heater operates when the compressor is at a standstill.
When the compressor starts up, the oil sump heating switches off.
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: 230 V - 1 - 50/60 Hz, 160 W.
ATTENTION The oil sump heater must generally be connected and
operated!
The compressor and the trigger unit MP10 are operational when the H3 LED (green) lights.
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:
5.7 Oil sump heater
In order to avoid damage to the compressor, the compressor is equipped with an oil sump heater as
a standart feature.