FM90 - Field Control® Fresh Mist Central System Humidifier

Freshmist 90
Owners Manual
Installation

Installation
(on sheet metal plenums)

  1. Mark a level line on selected plenum at bottom edge location for humidifier.

    NOTE: Unit must be installed level from left to right and front to back to maintain proper float control of water. See Fig. 10 for clearance required to open cover
    Fig10
    Hold the humidifier housing against the plenum with the bottom edge on the level line. Mark location of the (3) holes and large rectangular opening. Cut opening with tin snips or saw and drill (3) l/8" diameter holes (Fig. 9).

    Fig9
    CAUTION: Do not drill into return bends of air conditioning coil.
  2. Mount humidifier to hot air plenum using the three screws provided. Bend the two tabs 180" inward to seal humidifier to plenum (Fig. 11).
    Fig11
  3. Position collar at selected location on the cold air plenum. Mark center opening and five holes. Cut out center opening and drill five 1/8" holes.
  4. Attach collar and damper to cold air plenum. Use five screws provided. Damper blade fits between cold air plenum and collar (Fig. 12).
    Fig12
  5. Connect the flexible tube with tube clamps to humidifier and collar. Do not allow flexible tube to come within 3" of furnace flue pipe. if tube is under stress (pulling), it may be necessary to drill two holes in collar for screws. This will prevent the clamp from slipping off (Fig. 13).
    Fig13
  6. It is best to install an overflow line. Local codes may require overflow protection. The overflow is in the bottom of the reservoir. Use ½" inside diameter plastic or rubber tubing to connect drain (tubing not furnished) (Fig. 14).
    Fig14
    NOTE: Humidifier must be level for drain to work properly.
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