Control Module HVAC: Description and Operation

Power Supply and Ground Circuit for Auto Amp.

COMPONENT DESCRIPTION




Auto Amp. (Automatic Amplifier)
The auto amp. has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower motor and compressor are then controlled.

The auto amp. is unitized with control mechanisms. When the various switches and temperature dial are operated, data is input to the auto amp. from the AV C/U or AV and NAVI C/U using multiplex communication.

Self-diagnostic functions are also built into auto amp. to provide quick check of malfunctions in the auto air conditioner system.




Potentio Temperature Control (PTC)
The PTC is built into the multifunction switch. It can be set at an interval of 0.5 °C (1.0 °F) in the 18 °C (60 °F) to 32 °C (90 °F) temperature range by turning the temperature dial. The set temperature is displayed.