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Colored Wiring Diagram #4A3

Replacement air damper (Power Open) opens during firing with optional 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.
Color Wiring Diagram #4A3
Diagram #4A3: Forced Air Furnace having a replacement air supply duct.
 
ADDED: 
1. Power Open Replacement Air Control Damper (HAC-0x10- OPO), Power Open type. 
2. Hoyme Timer/Adaptor TMADP-0240-3WS, (Ready  mounted SPDT Toggle Switch with 24hr. Timer to override damper operation). .
 
OPERATION: 
1. 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. 
2. The Timer/Adaptor TMADP-0240-3WS has a manual toggle switch to keep the fresh air damper open when desired but also has a 24hr. Timer that automatically overrides the Damper from opening at predetermined times due to intervals of 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, 07 December 2012 11:12)