Combustion Air Damper for Two Furnaces:
#2. Combustion Air Damper (HOM-0x12-SF2) Interlocked to Two Furnaces/Boilers.
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. Combustion Air Damper Wires, however, are colored as shown.
Diagram #2: Two Forced Air Furnaces having a common Combustion Air Supply Duct.
- Combustion Air Damper for two appliances *(HOM-0x12-SF2)* but having only one Combustion Air Supply Duct. *(Damper has two separate operating circuits)*
OPERATION:
Combustion Air Damper is interlocked to both appliances so that the Damper proves to be open to supply fresh air for combustion when either one or the other or both Furnaces are firing.