Home Support Colored Wiring Diagrams #3 - #3A3 #3A3

Colored Wiring Diagram #3A3

Combustion air damper and replacement air damper (Power Open) & Hoyme Timer/Manual Switch
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations. Combustion Air Damper Wires, however, are colored as shown .
Diagram #3A3: Forced Air Furnace having a fresh air supply duct for combustion and a replacement air supply duct leading to the return plenum.
1. Combustion Air Damper ( HOM-0x11-SF1
2. Replacement Air Damper (Power Open)  (HAC-0x10-OPO). 
3. Hoyme Timer/Adaptor TMADP-0240-3WS , (Ready mounted SPDT Toggle Switch with 24hr TIMER to override damper operation).
1. Combustion Air Damper is interlocked to the thermostat so that the damper proves to be open to supply fresh air for combustion before the furnace fires. The damper closes to conserve energy when the fire stops. 
2. Replacement Air Damper is interconnected to the thermostat so that the damper opens to provide fresh air into the return plenum only during the heating cycle and will close to provide comfort and conserve energy when the fire stops. Heat Anticipator adjustment may be required on a regular type thermostat. The damper will also remain closed during furnace fan operation. 
3. A Timer/Adaptor has a manual switch to keep the fresh air damper open when desired but also has a timer that automatically overrides the Damper from opening at predetermined times due to outside foul air.
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the furnace fan.

1222-ld - Printed in Canada
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Last Updated (Friday, 16 October 2015 15:21)