Timer, Vent Switch, and Replacement Air Damper – Power Open:
#9A1. Identical to #9A but Power Open (Not Close) Fresh Air Damper (HAC-0x10-OPO)
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 #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.
- Replacement Air Damper, Power Open, (HAC-0x10-OPO) controls Fresh Air Inlet.
- Ventilation Switch and/or an optional bathroom timer supply a Controlled and a regular 120Vac power (3-Wires) to the Furnace area.
- Relay Adaptor with Interval Timer (TMADP-1102-TPX) functions as the automatic control centre.
OPERATION:
- Furnace fires with Thermostat signal
- Ventilation Switch and/or Bathroom Timer turns on Ventilation Fan, opens Replacement Air Damper and turns on Furnace Fan simultaneously
- 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
- 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.