120Vac Vent Switch, Combustion Air(2 furnaces), 2 Replacement Air Dampers (Power Close):
#5B. Two Furnaces, Combustion Air Damper (-SF2), Two Power Close Fresh Air Dampers With One (HAC-0x10-OPC) and One (HAC-0x11-OPC) c/w Relay, each Damper operating separately with One to each Furnace. Included is an Exhaust Fan and a 120vac Adaptor (ADP-1101-05A) that Opens the Fresh Air Damper and turns on the Furnace Fan during Ventilation only.
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 #5B: Two Furnaces having a Common Combustion Air and two Replacement Air Supply Ducts together with an Exhaust Fan controlled by a designated Ventilation Switch or Timer.
- Combustion Air Damper (HOM-0x12-SF2)
- HAC-0x10-OPC connected to the primary Furnace
- ADP-1101-05A connected to the primary Furnace only
- HAC-0x11-OPC Damper with Relay is connected to the secondary Furnace
OPERATION:
- Replacement Air Damper HAC-0x10-OPC is inter-connected to the Combustion Air Damper so that this Damper opens during firing of either or both Furnaces and Closes when firing stops
- Ventilation Switch and/or Timer turns on the Exhaust Fan, the Furnace Fan and opens the primary HAC Damper simultaneously
- The secondary damper HAC-0x11-OPC opens only when the secondary Furnace fires.
- Optional switch (i.e. toggle switch, timer, de-humidistat) on each HAC Damper allows independent control of each Damper
N.B. Replacement Air Dampers are not affected by the ‘Manual’ setting of the Furnace Fan.