24Vac Vent controlled by Switch and Replacement Air Damper Power Open:
#8A1. One 24vac Ventilation Switch, One Adaptor (ADP-0241-05A), One Power Open Replacement Air Damper (-PO) does not Open during Furnace firing and turns on 120vac Fan.
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 #8A1: Forced Air Furnace having a Replacement Air Supply Duct together with an Exhaust Fan controlled by a 24Vac Switch.
- Replacement Air Control Damper, Power Open (HAC-0x10-OPO)
- 24Vac Switch
- 24Vac Relay Adaptor (ADP-0241-10A) to function as a control center with 120Vac Power Switching to the Exhaust Fan
OPERATION:
- Furnace fires with Thermostat signal.
- 24Vac contacts/switch simultaneously turns on Furnace Fan, opens Replacement Air Damper and directly switches 120Vac to the Ventilation Fan
- Optional Switch (i.e. toggle switch, de-humidistat) allows full control of Replacement Air Damper to open as required
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the Furnace Fan