High-voltage heater (linear) Z189
684_008
High-voltage heater (linear) Z189 is a thermal management component. Its task is to heat the coolant in the coolant circuit as nec-
essary when requested.
A flat, electrically isolated heating element is applied to a metal plate inside high-voltage heater Z189. If current is now applied to
the heating element, it heats the metal plate. This then transmits the heat to the coolant, which is guided past on the other side of
the plate.
The nominal voltage of the high-voltage heater Z189 is 800 V. However, it is capable of providing approx. 3.5 kW of heating output
from an input voltage of approx. 250 V. The maximum heating output of approx. 10 kW is available from a voltage of 450 V.
The control unit integrated in the high-voltage heater (linear) Z189 is a LIN bus node and exchanges information with thermal
management control unit J1024 via the LIN bus.
Note
When the auxiliary air conditioning is active, the high-voltage system is active and the high-voltage components are
energised. The timer settings for charging and air conditioning are stored in the control unit for high-voltage battery
charging unit J1050.
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