24Vac vent controlled by switch and replacement air damper Power Open
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Diagram #8A1: Forced Air Furnace having a replacement air supply duct together with an exhaust fan controlled by a 24Vac Switch.
2. 24Vac Switch.
3. 24Vac Relay Adaptor (ADP-0241-10A) to function as a control centre with 120Vac power switching to the exhaust fan.
1. Furnace fires with thermostat signal.
2. 24Vac contacts/switch simultaneously turns on Furnace Fan, opens Replacement Air Damper and directly switches 120Vac to the Ventilation Fan.
3. 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.
1222-ld - Printed in Canada