120Vac vent switch, combustion air(2 furnaces), 2 replacement
air dampers (Power Close)
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 #5B: Two
Furnaces having a
common combustion air
supply ducts together with an
controlled by a designated
ventilation switch or timer.
HAC-0x11- OPC damper with relay is connected to the
Replacement Air Damper
HAC-0x10- OPC is inter-connected to the Combustion Air Damper so
that this damper opens during firing of either or both furnaces and closes when firing stops.
Ventilation Switch and/or timer turns on the exhaust
fan, the furnace fan and opens the primary HAC damper simultaneously.
3. The secondary damper
HAC-0x11- OPC opens only when the secondary furnace
4. Optional switch
(i.e. toggle switch, timer, de-humidistat) on each HAC
damper allows independent control of each damper.
N.B. Replacement Air Dampers are not
affected by the ‘Manual’ setting of the furnace fan.
1632-ld - Printed in Canada
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