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Colored Wiring Diagram #7A

24Vac vent switch, combustion air, and replacement air with two exhaust fans and two individual timers 

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 .

Color Wiring Diagram #7A

Diagram #7A:  A Forced Air Furnace, a combustion air supply duct, a replacement air supply duct, two exhaust fans, two individual timers and an adaptor ADP-0241-05A.

1. Combustion Air Damper (HOM-0x11-SF1)  
2. Replacement Air Damper (HAC-0x10-OPC)  
3. Two exhaust fans having individual timers with switching capabilities  
4. 24Vac 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/Timer (either one) turns on Exhaust Fan(s), opens Replacement Air Damper and turns on Furnace Fan simultaneously. 
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.

N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the furnace fan.

1718-ld - Printed in Canada

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Last Updated (Tuesday, 23 May 2017 11:23)