24Vac Vent Switch, Combustion Air, and Replacement Air:
#7. One 24vac Ventilation Switch/Timer, Combustion Air Damper, One Adaptor (ADP-0241-05A), One Power Close Replacement Air Damper (-PC).
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 #7: Forced Air Furnace having a Combustion Air and a Replacement Air Supply Duct together with an Exhaust Fan controlled by a designated Ventilation Switch and/or Bathroom Timer that sends a 24Vac signal to the Furnace area.
- Combustion Air Damper (HOM-0x11-SF1)
- Replacement Air Damper (HAC-0x10-OPC)
- Ventilation Switch and/or bathroom timer to supply 24Vac to the Furnace area.
- 24Vac Relay Adaptor (ADP-0241-05A) to function as a control center
OPERATION:
- Combustion Air Damper and Replacement Air Damper open during Furnace firing
- Ventilation Switch and/or Bathroom Timer turns on Exhaust Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously
- Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air Damper to open as required provided it is a Power Close type
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the Furnace Fan.