Vent Switch, Combustion Air, and Interlocking Replacement Air:
#11. Forced Air Furnace with Combustion Air Damper (HOM-0x11-SF1) and a Power Close Replacement Air Damper (HAC-0x11-SPC) c/w End Switch that uses Adaptor (ADP-1102-TPX) that proves Replacement Air Damper is Opened before Exhaust Fan and Furnace Fan runs with Ventilation Switch and both Dampers open during Furnace firing.
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. Combustion Air Damper Wires, however, are colored as shown.
Diagram #11: Forced Air Furnace having a Combustion Air Supply Duct and a Replacement Air Supply Duct together with a designated Ventilation Switch and/or Bathroom Timer to turn on an Exhaust Ean INTERLOCKED to a Replacement Air Control Damper to prove to be open before Exhaust Fan runs.
- Combustion Air Damper (HOM-0x11-SF1) .
- Replacement Air Damper with Relay and an End Switch (HAC-0x11-SPC)
- Ventilation Switch and/or bathroom timer with controlled and regular 120Vac 3-Wire supply to Furnace area.
- Relay Adaptor (ADP-1102-TPX) functions as a control center.
OPERATION:
- Combustion Air and Replacement Air Damper open during Furnace firing.
- Ventilation Switch and/or Bathroom Timer opens the Replacement Air Damper. After Damper proves to be opened (INTERLOCKED), the Ventilation Fan and Furnace Fan will turn on.
- Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air Damper to open at any time provided it is the PC type.
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the Furnace Fan.