Home Support Colored Wiring Diagrams #8B - #8D2 #8C1

Colored Wiring Diagram #8C1

Two Forced Air Furnaces sharing a replacement air supply duct controlled by one fresh air damper with Power Open Damper
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Diagram #8C1: Two Forced Air Furnaces sharing a common replacement air supply duct controlled by one Power Open fresh air damper. The damper opens when either furnace fires. If using a Power Close damper, go to Color Wiring Diagram # 8C for details.

1. Replacement Air Control Damper, Power Open (HAC-0x10-OPO) where ‘x’ = diameter of the damper. 
2. 24Vac Relay Adaptor (ADP-0241-05A) to operate the damper from either furnace.

OPERATION: 
1. The Power Open (PO) Replacement Air Control Damper  will open when the thermostat of either furnace asks for heat and  will remain open until both thermostats turn the furnaces off.

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

1222-ld - Printed in Canada

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Last Updated (Tuesday, 20 October 2015 14:48)