Home Support Colored Wiring Diagrams #8 - #8A9 #8A9

Colored Wiring Diagram #8A9

Forced Air Furnace with Power Open replacement air duct with a Vent Switch that sends a 24Vac signal to furnace area.
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 .
Colored Wiring Diagram #8A9

Diagram #8A9: Forced Air Furnace having 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. Replacement Air Control Damper, Power Open (HAC-0x10- OPO)
. Ventilation Switch and/or bathroom timer that sends Controlled 24Vac to furnace area.
3. 24Vac Relay Adaptor (ADP-0242-05A)  to function as a control centre.


1. Replacement Air Damper opens when Furnace fires with thermostat signal.
2. Ventilation Switch and/or bathroom timer turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously. Note PO damper is connected to adaptor terminal #5.
3. Optional Switch connected between terminal #4 and #5 of the adaptor allows full control of Replacement Air damper to open as required.

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

1652-ld Printed in Canada

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Last Updated (Friday, 30 December 2016 12:22)