Combustion air damper for two furnaces and two replacement
air dampers (Power Close)
Hoyme Manufacturing Inc. Special Note: Circuits are colored for
and are not necessarily those found in actual installations. Combustion Air Damper Wires, however, are
colored as shown.
Forced Air Furnaces having a
common combustion air supply duct and two separate replacement fresh
air supply ducts.
1. Combustion Air Damper
but having only
combustion air supply duct.* (This Damper has two separate operating
2. Replacement Air Dampers
Close) are inter-connected to each other and to the HOM.
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. Both HAC
Replacement Air Dampers will also open when either furnace fires. Air will be drawn in, however, only for the furnace
that is firing provided furnace circulation fans run only when furnaces fire.
1222-ld - Printed in