A/C Request Signal

A/C Request Signal
The A/C request circuit signals the VCM when an A/C mode is selected at the NC control head. The VCM uses this information in order to enable the NC compressor clutch and to adjust the idle speed before turning ON the A/C clutch. If this signal is not available to the VCM, the A/C compressor will be inoperative.

Refer to HVAC Systems -Manual for NC wiring diagrams and diagnosis of the NC electrical system.