Wires of the Combustion Air Damper, however, are colored as shown.

Diagram #11: Forced Air Furnace having a combustion air supply duct and a replacement air supply duct together with a designated ventilation switch to turn on an exhaust fan INTERLOCKED to a replacement air control damper.

ADDED: 1. Combustion Air Damper (HOM-0x11-SF1). 2. Replacement Air Damper with Relay andan End Switch (HAC-0x11-SPC) 3. Ventilation Switch with 120Vac, 3-Wire supply to furnace area. 4. Relay Adaptor (ADP-1102-TPX) functions as a control centre.

 

OPERATION: 1. Combustion Air and Replacement air damper open during furnace firing.  2. Ventilation Switch opens the Replacement Air Damper. After Damper proves to be opened (INTERLOCKED), the Ventilation Fan and Furnace Fan will turn on. 3. Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air Damper to open at any time provided it is the PC type.