Two Replacement fresh air supply ducts with dampers, exhaust fan
and Vent Switch
Hoyme Manufacturing Inc. Special Note: Circuits are colored for
and are not necessarily those found in actual installations.
Diagram #6B1: One Forced Air Furnace having
two replacement air
two fresh air dampers
together with a
large exhaust fan, a designated
Replacement Air Control Dampers
Ventilation Switch and/or timer to supply
Controlled 120Vac to furnace area.
3. (ADP-1101-05A) opens
both Fresh Air Dampers when operating a
large exhaust fan.
4. (ADP-0241-05A) opens only
one Fresh Air Damper when
furnace is firing.
One Fresh air Damper opens during Furnace firing.
Ventilation Switch and/or timer
simultaneously turns on the Ventilation Fan, the Furnace Circulation Fan and opens
both Fresh Air Dampers.
Optional Overriding Toggle Switch (connected to one damper only) causes
both Fresh Air Dampers to open as required.
N.B. Replacement Air Dampers are not affected by the ‘Manual’ setting of the furnace fan.
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