Control for fuel-operated heating device for motor vehicles has secondary control for adapting operation of fuel pump and air intake blower to change in air density

摘要

the control switch operates the air intake blower and/or the fuel pump and a secondary control (10) which can be selectively added on allows the operation of the fuel pump (3) and/or blower (2) to be adapted to chairs in the air density. The secondary control is connected electrically in front of the fuel pump and/or the blower and modifies an electric operating current controlled by the control unit for the pump and blower. The secondary control checks for faults so when necessary remains in a state where the operating current for the lower and pump passes through unchanged.