120 Vac vent switch, Adaptor 1102-TWP and replacement air
damper, Power Open with High volume Kitchen Exhaust fan interconnected to a Forced Air Heating System, replacement air with
inlet fan interlocked with a separate Power Open Damper
Hoyme Manufacturing Inc. Special Note: Circuits are colored for
and are not necessarily those found in actual installations.
Forced Air Furnace having a regular replacement air supply duct with an
inlet damper and an
exhaust fan controlled by a designated
In addition, a special
Replacement Air supply duct with a
with End Switch, a Booster Inlet fan and a
1. Replacement Air Control Damper
(HAC-0x10-OPO) where “x”= diameter.
Ventilation Switch to supply
Controlled 120Vac to furnace area.
to function as a control centre for regular ventilation.
4. Power Open
Damper with an
INTERLOCKED to an
Inlet Fan to supply
extra replacement air for a
high volume Exhaust Fan.
Interface Relay Adaptor
acts as a control centre for the extra replacement air.
1. Replacement Air Damper opens during furnace firing.
2. The designated Ventilation Switch simultaneously turns on the Exhaust Fan, the Furnace Fan and opens the Replacement Air
3. Optional on/off Switch
connected between #1 and #2 of the adaptor (ADP-1102-TWP) or
(ADP-1102-TPX) allows full control of the Replacement Air Dampers to open as required.
In addition, the high volume exhaust fan switch signals the adaptor
(ADP-1102-TPX) to start the furnace circulation fan and open the extra replacement air damper.
5. After the extra
Damper with End Switch proves to be open, both the
Inlet Booster Fan and the high volume
Exhaust Fan turn on. The Fans are, therefore,
Interlocked to run only after the inlet damper is open for replacement air.
Option: Consider an Inline electric heater with an airflow switch
to temper incoming cold air.
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Printed in Canada