1 Flange (supply and return)
2 Junction box
3 Non-return flap
4 Continuous flow heater
5 Thermostat
6 Circulating pump
Function
The preheating unit heats up the engine coolant. The circulating pump (6) ensures the circulation of the pre-
heated coolant through the engine.
The flow heater (4) incorporates a heating element. A non-return flap (3) prevents coolant from flowing
through the preheating unit when the engine is running.
When the coolant temperature has reached the value of the thermostat setting, the thermostat (5) switches
off the preheating unit via contactors.
In the event of excessive coolant temperature, the temperature limiter in the thermostat (5) opens the con-
trol loop. The preheating unit is switched off.
The system is reset manually after the fault has been eliminated.
MS150109/01E 2015-11 | Task Description | 243
TIM-ID: 0000014748 - 006
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