120Vac Vent Switch, Combustion Air, and Replacement Air Damper (Power Close):
#5. 120vac Exhaust Fan With Adaptor (ADP-1101-05A) Causing a Power Close Fresh Air Damper to Open and also turn on a Furnace Fan without interfering with the operation of the Combustion Air Damper.
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 #5: 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.
- Combustion Air Damper ( HOM-0x11-SF1 )
- Replacement Air Damper ( HAC-0x10-OPC )
- Ventilation Switch and/or Timer to supply 120Vac to Furnace area
- Relay Adaptor ( ADP-1101-05A ) 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 without interfering with the Air Conditioner
- Optional switch (i.e. toggle switch, timer, de-humidistat) provides full control of Replacement Air Damper to open separately provided the Damper is the Power Close (PC) type
Note: ‘Manual’ setting of the Furnace Fan does not affect the Replacement Air Damper operation.
When using two bathroom timers to control two Exhaust Fans and involving only one Furnace, use one Relay Adaptor for each Timer/Exhaust Fan. Connect Relay Adaptor terminals 1-1, 2-2, 3-3, 4-4, 5-5.