Timer, vent switch, replacement air, Power Open, and an
exhaust fan with 3-way ventilation switch
Hoyme Manufacturing Inc. Special Note: Circuits are colored for
and are not necessarily those found in actual installations.
Forced Air Furnace having a
supply duct and an
controlled by a designated
ventilation switch, a 3-way ventilation switch
Interval Timer Adaptor
2. Ventilation Switch
power supply to the furnace area.
3-way Ventilation Switch
to control ventilation
Interval Timer Adaptor (TMADP-1102-TPX)
which functions as a complete control centre.
1. Furnace fires with thermostat signal.
2. Ventilation switch
turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace
Three-way Ventilation Switch
turns on the Ventilation
(Not recommended unless
living in coastal climates
warmer than -10C
and/or ample replacement air is supplied).
4. Optional switch
(i.e. toggle switch, timer, 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
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