Combustion air damper with Heat Limit Switch
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.
A Forced Air Furnace or Boiler having a combustion
air supply duct.
Heat Limit Switch (HLS-1100) that opens on temperature rise.
Combustion Air Damper
is interlocked to the Thermostat/Aqua-stat and the gas valve
so that the damper proves to be open to supply fresh air before the furnace/boiler fires. The damper closes to
when the fire stops. An Optional Heat Limit Switch may be
added in series with the 24Vac power supply to the live side of the motor to cause the damper to open simultaneously with
the sensing of a temperature rise of 130 degrees F.
1222-ld - Printed in
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