Replacement air damper (Power Close with Relay) 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 #4: Forced Air Furnace having a replacement air supply duct.
ADDED: Replacement Air Control Damper, Power Close type with 1 Relay, (HAC-0x11- OPC).
1. Replacement air damper is interconnected to the furnace so that the damper opens to provide fresh air during the heating cycle and closes to conserve energy when the fire stops. Damper remains closed irrespective of Furnace Fan operation.
2. Optional Switch, (i.e. toggle switch, timer, de-humidistat) allows Damper to open provided the HAC damper is the PC type.
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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