Home Support Colored Wiring Diagrams #8B - #8D2 #8C3

Colored Wiring Diagram #8C3

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 #8C3: 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 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. 
3. Ready mounted Optional Toggle Switch (SPDT) (ADP-0240-3WS) to override the damper to be continually open.

  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. 
2. The ADP-0241-05A uses both sides of the relay to control the 24Vac circuits and damper. 
3. Optional Toggle Switch (SPDT) is ready mounted for ease of installation (ADP-0240-3WS) to keep the damper continually in the  open position. Follow colored wire diagram.
 
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 15:06)