Home Support Colored Wiring Diagrams #6C - #7A1 #7

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 .

Color Wiring Diagram #

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.

1718-ld - Printed in Canada

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Last Updated (Tuesday, 23 May 2017 11:22)