Home Support Colored Wiring Diagrams #9 - #9C1 #9A1

Colored Wiring Diagram #9A1

Timer, vent switch, and replacement air damper, Power Open

HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Color Wiring Diagram #9A1
Diagram #9A1: Forced Air Furnace having a replacement air supply duct together with an exhaust fan controlled by a designated ventilation switch and/or an optional bathroom timer and an interval timer.

1. Replacement Air Damper, power open, (HAC-0x10-OPO) controls fresh air inlet.  
2. Ventilation Switch and/or an optional bathroom timer supply a Controlled and a Regular 120Vac power (3-Wires) to the furnace area. 
3. Relay Adaptor with Interval Timer (TMADP-1102-TPX) functions as the automatic 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. Interval Timer can be set for minimum or multiple consecutive settings of 15 minutes to simultaneously turn on Ventilation Fan open Replacement Air Damper and turn on the Furnace Fan.
4. Optional switch (i.e. toggle switch, timer, de-humidistat) connected between #1 and #2 of the Adaptor allows full control of the PO Replacement Air Damper to open as required.

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

1709-ld - Printed in Canada

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Last Updated (Thursday, 02 March 2017 09:46)