Vent switch 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.
Diagram #12: High-efficient Forced Air Furnace plus AC (If applicable).
ADDED: 1. Replacement Air Damper with Relay and End Switch (HAC-0x11-SPC). 2. Ventilation Switch with Two Controlled 120VAC, 3-Wire supply to furnace area. 3. Relay Adaptor (ADP-1102-TPX) functions as a control centre.
OPERATION: 1. Replacement air damper opens 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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