Diagram #12: Forced Air Furnace having 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. Replacement Air Damper with Relay and End Switch (HAC-0x11-SPC).   

2. Ventilation Switch with 120Vac, 3-Wire supply to furnace area. 3. Relay Adaptor (ADP-1102-TPX) functions as a control centre.

 

OPERATION: 1. Replacement air damper opens during furnace firing. 2. Ventilation Switch opens the Replacement Air Damper. After Damper proves to be opened (INTERLOCKED), the exhaust 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.

 

0828                                                                                                              Printed in Canada