Vent switch, combustion air, and interlocking 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 #11: Mid-efficient Forced Air Furnace plus AC (If applicable).
ADDED: 1. Combustion Air Damper. 2. Replacement Air Damper with Relay
and End Switch (HAC-0x11-SPC) 3. Ventilation Switch with two Controlled 120VAC, 3-Wire supply to furnace area. 4. Relay Adaptor (ADP-1102-TPX) functions as a control centre.
OPERATION: 1. Combustion Air and Replacement air damper open during furnace firing. 2. Ventilation Switch opens the Replacement Air Damper. After Damper proves to be open (Interlocked), the Ventilation Fan and Furnace Fan will turn on. 3. Optional switch (i.e. toggle switch, timer, de-humidistat) allows full control of Replacement Air Damper to open at any time provided it is the PC type.
0621 Printed in Canada
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