24Vac vent switch with relay, replacement air damper Power Close
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Diagram #8B: Forced Air Furnace having a replacement air supply duct together with an exhaust fan controlled by a designated ventilation switch and/or bathroom timer together with a 120Vac relay that sends a 24Vac signal to the furnace area.
1. Replacement Air Control Damper, Power Close (HAC-0x1O-OPC)
2. Ventilation Switch and/or bathroom timer. 3. 24Vac Relay Adaptor (ADP-0241-05A) to function as a control centre.
OPERATION: 1. Furnace fires with thermostat signal. 2. Ventilation Switch and/or bathroom timer turns on Ventilation Fan, 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.
N.B. Replacement Air Damper is not affected by the ‘Manual’ setting of the furnace fan.
0940 Printed in Canada
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