Plug-in exhaust fan controlled by a designated ventilation
switch and automatic interval timer
Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification
only and are not necessarily those found in actual installations.
Diagram #9A3: Forced Air Furnace having a
replacement air supply duct together with a plug-in
exhaust fan controlled by a designated
ventilation switch and automatic
interval timer for recycling the entire system.
Replacement Air Damper, power open,
(HAC-0x10-OPO) controls fresh air inlet.
Ventilation Switch controls the Receptacle Timer Adaptor
(TRADP-1102-TPX) placed in the furnace area.
3. Plug-in Exhaust Fan controlled by the Adaptor.
4. Relay Adaptor with
Interval Timer functions as the automatic control centre.
Furnace fires with thermostat signal.
2. Ventilation Switch turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace Fan
Interval Timer (Recycler) can be set for minimum or multiple consecutive settings of 15 minutes to
simultaneously turn on
Ventilation Fan open
Replacement Air Damper and turn on the
4. Optional switch (i.e. toggle switch, de-humidistat) connected between #1 and #2 of the Adaptor allows
full control of the
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
Printer friendly (pdf)
- (opens in new window)