120Vac vent switch, combustion air and two replacement air
dampers(Power Close)(2 furnaces)
Hoyme Manufacturing Inc. Special Note: Circuits are colored for
and are not necessarily those found in actual installations. Wires of
Combustion Air Damper, however, are
colored as shown
Diagram #5A: Two
Furnaces having a
common combustion air
two replacement air
supply ducts together with and
controlled by a designated
ventilation switch and/or bathroom timer.
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120Vac Ventilation Switch and/or bathroom timer.
on primary furnace to act as a control center.
Replacement Air Dampers are inter-connected to the Combustion Air Damper
so that three dampers open during firing of either or both furnaces and close when firing stops.
Ventilation Switch and/or bathroom timer
turns on exhaust fan, primary furnace fan and opens both HAC dampers
3. Optional switch
to each HAC damper allows independent control of each fresh
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of
the furnace fan.
1632-ld - Printed in Canada