Blower Delay Timer - HVAC System - Automatic

The blower delay timer is active only when the system senses it should be putting out heat in "Heat" "Auto" modes. The blower delay timer keeps the blower at minimum speed to allow the engine coolant to warm up. In cases of very cold ambient temperatures, delay can last up to 5 minutes. To check for correct operation of the blower delay timer:

^ Select 60° and "Hi". No delay in system operation should occur.
^ Select a high temperature setting and either "Heat," "Auto," or "Bi-Level" modes. The blower delay timer should engage, keeping the blower at minimum speed (no longer than 5 minutes), until engine coolant has warmed up. Then, the blower fan should be energized.

In the "Hi" or "Defrost" modes or when cooling is required in "Auto" the blower delay timer will not function/nor should the timer function once the engine is warmed up.

The control must have a constant battery positive (+) feed to maintain memory function.