Forced Air Furnace with Power Open Replacement Air Duct with a Vent Switch that sends a 24Vac signal to Furnace area:
#8B7. Forced Air Furnace with Power Close Replacement Air Damper (HAC-0x10-OPC) and a Ventilation Switch/Timer that uses Adaptor (ADP-0242-05A) to Open Replacement Air Damper with Ventilation Fan and also Opens 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 #8B7: Forced Air Furnace having 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.
- Replacement Air Control Damper, Power Open (HAC-0x10- OPC)
- Ventilation Switch and/or Bathroom Timer that sends Controlled 24Vac to Furnace area
- 24Vac Relay Adaptor (ADP-0242-05A) to function as a control center
OPERATION:
- Replacement Air Damper opens when Furnace fires with Thermostat signal
- Ventilation Switch and/or bathroom timer turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously. Note PC Damper is connected to Adaptor Terminal #4
- Optional Switch (i.e. toggle switch) allows full control of the Replacement Air Damper to open separately provided it is a Power Close type Damper
For Power Open Damper See Diagram #8A9
N.B. Replacement Air Damper is not affected by the Manual setting of the Furnace Fan.