Colored Wiring Diagram #7

24Vac vent switch, combustion air, and replacement air

HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. Wires of the Combustion Air Damper, however, are colored as shown.

Diagram #7: Forced Air Furnace having a combustion air and a replacement air supply duct together with an exhaust fan controlled by a designated ventilation switch and/or bathroom timer that sends a 24Vac signal to the furnace area.

1. Combustion Air Damper (HOM-0x11-SF1)

2. Replacement Air Damper (HAC-0x10- OPC)

3. Ventilation Switch and/or bathroom timer to supply 24Vac to the furnace area.

4. 24Vac Relay Adaptor (ADP-0241-05A) to function as a control centre.

OPERATION:

1. Combustion Air Damper and Replacement air damper open during furnace firing.

2. Ventilation Switch and/or bathroom timer turns on Exhaust Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously.

3. Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air damper to open as required provided it is a Power Close type.

N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the furnace fan.

1222-ld - Printed in Canada

Printer friendly (pdf) - (Opens in a new window)

Last Updated (Friday, 09 November 2012 16:46)

"Putting a Damper on Cold Air"

Colored Wiring Diagram #7