Timer, vent switch, replacement air damper, Power
Close and a 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
replacement air supply duct together with an
exhaust fan controlled by a designated
3-way ventilation switch and/or an
interval timer Adaptor.
Replacement Air Damper, power close recommended, (HAC-0x10- OPC)
2. Ventilation Switch
(3-way) supplies a
Controlled and a
Regular 120Vac (3-wires) to the furnace area without interference to the AC.
3. Relay Adaptor with
Interval Timer Adaptor
functions as a control centre.
1. Furnace fires with thermostat signal.
2. Three-way Ventilation Switch
in one position
allows the normal function of the
Timer Adaptor to turn on the Ventilation Fan, open the Replacement Air Damper and turn on the Furnace Fan
Ventilation switch in the other position
, turns on the
ventilation fan only (Not recommended unless living in coastal climates
warmer than -10C and/or ample replacement air is supplied).
3. Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air Damper
to open as required provided it is a
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the
1705-ld - Printed in Canada
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