192004636 - E6015 ADDITIONAL HEATER - DESCRIPTION (Webasto)
Description
The climate control via the heater unit is insufficient when the engine is cold, especially in Diesel engines which are slow to warm up.These engines may optionally be fitted with a supplementary heater system. This remains active from the moment when the engine is turned on until a certain temperature is reached.The system consists of an additional heater, located in the heater unit: the device contains three resistances (PTC).The operation of the resistances is controlled by the climate control unit which either operates only one, two or three of them, providing gradual heating, with a maximum power of 700 W following a logic which depends on:
- the temperature of the engine coolant (about 60°?);
- the engine speed (which should be above 700 rpm).
- the battery voltage (which should not go below 12.2 V).
The supply of one, two or three resistances is controlled by two relays located on the heater unit:
- 1. Level: activated by the first relay;
- 2. Level: activated by the second relay;
- 3. Level: activated by both relays.