This system is designed to heat the coolant.
The immersion heaters are supplied with 12 V via three relays. One relay controls two immersion heaters. each of the other two relays controls the operation of one immersion heater. This allows you to control one, two, three or all four immersion heaters.
Note. Immersion heater resistance: 0.45±0.05 Ohm at 20°C.
Management strategy
When the immersion heaters are operating, the idling mode is increased to 935 min-1.
Immersion heaters switched off:
- during preheating;
- during subsequent heating;
- when the heated windshield is turned on;
- at engine speeds below 600 min-1.
Under the above conditions, the immersion heaters are controlled based on air and coolant temperature.
Unshaded area: thermoplunger switched off.
Shaded area: thermoplunger is on.