Timer, 3-way vent switch and replacement air
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Diagram #9B: High-efficient Forced Air Furnace plus AC (if applicable).
ADDED: 1. Replacement Air Damper (HAC-0x10-OPC) 2. Ventilation Switch (3-way) supplies Controlled and Regular 120VAC, 3-Wire to the furnace area without interference to the AC. 3. Relay Adaptor with Interval Timer (TMADP-1102-TPX) functions as a control centre.
OPERATION: 1. Furnace fires with thermostat signal. 2.Three-way Ventilation Switch in one position allows the normal function of the Timer to turn on the Ventilation Fan, open the Replacement Air Damper and turn on the Furnace Fan simultaneously. The Ventilation switch in the other position, turns on the ventilation fan only. (Not recommended unless 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 PC type.
0619 Printed in Canada
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