120Vac vent switch and replacement air opens during firing 

HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. 



Diagram #6: Forced Air Furnace having a replacement air supply duct together with and exhaust fan controlled by a designated ventilation switch.
 
ADDED:  1. Replacement Air Control Damper (PC) with Relay (HAC-0x11-OPC) 2. Ventilation Switch to supply Controlled 120Vac to furnace area. 
3. Relay Adaptor (ADP-1101-05A) to function as a control centre.
 
OPERATION: 1. Damper opens to provide fresh air during the ventilation or heating cycle. 2. Ventilation Switch turns on Ventilation Fan, opens Replacement Air Damperand 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 the Replacement Air Damper to open as required provided it is PC type.
 
0828                                                                                                                Printed in Canada

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