PTC Element Heater Control

SYSTEM

AUTOMATIC AIR CONDITIONING SYSTEM : PTC Element Heater Control


DESCRIPTION

- Based on the air mix door position and signals input from each sensor, the A/C auto amp. calculates the target coolant temperature [ambient temperature - approximately 70�
C (158�F)].
- A/C auto amp. transmits the operating rate to the PTC element heater via LIN communications so that the calculated target coolant temperature is achieved.
- Based on the A/C auto amp. command, the control circuit inside the PTC element heater controls the heater output by the PWM method.