Timer, vent switch, combustion air, and replacement air
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. Wires of the Combustion Air Damper, however, are colored as shown.
Diagram #9: Mid-efficient Forced Air Furnace plus AC (if applicable).
ADDED: 1. Combustion Air Damper (HOM-0x11-SF1) 2. Replacement Air Damper (HAC-0x10-OPC) 3. Ventilation Switch to supply Controlled and Regular 120VAC, 3-Wire to furnace area. 4. Relay Adaptor with Interval Timer (TMADP-1102-TPX) to function as a control centre.
OPERATION: 1. Combustion Air Damper and Replacement air damper open during furnace firing. 2. Ventilation Switch turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously. 3. Interval Timer can be set for minimum or multiple consecutive settings of 15 minutes to turn on Ventilation Fan, open Replacement Air Damper and turn on Furnace Fan simultaneously without interfering with the AC. 4. 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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