FM90 - Field Control® Fresh Mist Central System Humidifier

Freshmist 90
Owners Manual
Humidistat- cold air plenum mount

Humidistat

The humidistat is designed to mount on the cold air plenum of your furnace or on an interior wall of the home. The cold air plenum, however is the preferred location for sensing the average humidity throughout your home. Select your location and follow the appropriate instructions.

NOTE: THE HUMIDISTAT AS SUPPLIED IS ASSEMBLED FOR COLD AIR PLENUM INSTALLATION (FIG. 20).

1. Select a location that is a minimum of 6" upstream on cold air plenum (Fig. 21).
   
   Peel off paper backing and position template supplied, drill (4) 1/8" diameter holes and cut out center portion along solid line. Peel off backing and apply gasket material as indicated by dashed lines.
   
   CAUTION: DO NOT install humidistat on hot air plenum.
   
2. Remove knob and cover from humidistat. To remove cover, place screwdriver blade in slot at side of humidistat and twist.
   
3. Position humidistat in opening and fasten with 4 screws provided.
   
4. Install shaft extension. install cover by snapping onto back plate. Press knob onto shaft extension.
   
5. Connect wiring (Fig. 23). Plug 24 VAC transformer into 120 VAC outlet.
   
6. Peel off backing and attach the operating instruction label onto the cold air plenum next to the humidistat.

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