24VAC 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 #7: 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 24VAC to furnace area. 4. Relay Adaptor (ADP-0241-05A) to function as a control centre.
OPERATION: 1. Combustion Air Damper and Replacement air damper open during furnace firing. 2. Ventilation Switch turns on Exhaust Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously without interfering with the Air Conditioner. 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 Power Close type.
0620 Printed in Canada
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