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Sprinter 906
HZ5
Heavy Duty Fuel-fired pre-heater/booster (34,000 BTU)
Details & Technology
The dual-function hot-water auxiliary heater operates both as an engine pre-heater and as an
auxiliary heater booster.
The engine pre-heater (5 kW [17,000 BTU]) can be switched on with a switch with indicator
light. The indicator light comes on whenever this function is active.
The maximum heating time is 60 minutes. Heating operation is also dependent on the coolant
temperature. After the engine is switched off the engine pre-heater will continue to run for 15
minutes.
The booster (10 kW [34,000 BTU]) mode is activated automatically as a function of coolant
temperature, whenever the engine is switched on. An indicator light comes on whenever the
booster function is active. When the engine has been switched OFF, the heater booster
continues to run for approx. 2 minutes.
If both the pre-heater and heater booster functions are activated, the pre-heater has priority.
After the auxiliary heater function has been switched off, either manually or automatically, the
heater booster is activated automatically.
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