Two Vent Switches and Interlocking Replacement Air – Power Open:
#12B3. Forced Air Furnace with Power Open Replacement Air Damper (HAC-0x10-SPO) c/w End Switch that uses Two Adaptors (ADP-1102-TPX) to prove Replacement Air Damper is Open before either or both of the Two Independent Ventilation Fans will run with the Furnace Fan when the corresponding Independent Ventilation Switches/Timers are activated. Replacement Air Damper does not Open 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 #12B3: Forced Air Furnace having a Replacement Air Supply Duct together with Two designated Ventilation Switches and/or Bathroom Timers to turn on an Exhaust Fan INTERLOCKED to a replacement Power Open Air Control Damper.
- Replacement Power Open Air Damper and End Switch (HAC-0x10-SPO)
- Ventilation Switches and/or Bathroom Timers with 3-Wire 120Vac supply to Furnace area
- Relay Adaptors (ADP-1102-TPX) function as a control centers
OPERATION:
- Furnace fires with Thermostat signal
- Ventilation Switch and/or Bathroom Timer opens the Replacement Air Damper. After Damper proves to be open (INTERLOCKED), the Exhaust Fan and Furnace Fan will turn on
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the Furnace Fan.
Also does not interfere with the Air Conditioner.