FM90 - Field Control® Fresh Mist Central System Humidifier

Freshmist 90
Owners Manual
Maintenance

Maintenance

CLEANING AND SERVICE INSTRUCTIONS:

The humidifier is an appliance that works with water. The dissolved minerals normally found in tap water are left as lime deposits in the humidifier. REGULAR CLEANING is necessary to keep the parts free of lime deposits. Deposit buildup will reduce humidifier output. Ease of servicing has been foremost in the design of this humidifier. Service at least every (4) four weeks during the heating season or more often depending on the water conditions.

  1. Unplug transformer.
  2. Close saddle valve.
  3. Remove the front plastic panel and lift up top hinged cover.
  4. Pull out pivot pin and remove float and float arm.
  5. Lift out the media wheel and reservoir.
  6. Pour contents of reservoir down the drain.
  7. Clean lime from all parts using a solution of vinegar and water, detergent and water.
  8. Remove media pad from inside of wheel and clean thoroughly, replace if necessary.

    IMPORTANT: Stretch new media lengthwise before placing in wheel.
  9. If the Reservoir has been overflowing, the operating Float Valve Button may be worn. Remove the operating Float Valve Button, turn it over and reinsert or replace after both surfaces are worn (Fig. 24).
    Fig24
  10. Reinstall reservoir, media wheel with pad, float and pivot pin.
  11. Open saddle valve and check water level in reservoir. Adjust float as required.
  12. Close top metal hinged cover and replace front plastic cover.
  13. Plug in transformer.
  14. Turn humidistat to “test” momentarily and check for media wheel rotation. Reset humidistat according to outdoor temperature as instructed on label and reinstall front cover. Unit is back in operation.

SUMMER SHUT DOWN:
Unplug transformer, close saddle valve, close bypass damper. (CLEAN PER ABOVE AND LEAVE RESERVOIR EMPTY.) As a reminder, you may want to put a tag or sticker on the unit indicating it has been shut down for the summer and will require start up in the fall.

FALL START UP:
Plug in transformer, open saddle valve, open bypass damper and set humidistat to TEST position. Check for proper water level and media wheel operation. Set humidistat according to outdoor temperature as instructed on label.

SERVICING THE FLOAT:
If the humidifier has been overflowing, the float valve button may be worn. This button will wear much like a faucet washer. To service:

  1. Turn off water at saddle valve.
  2. Remove float from humidifier (pull out pivot pin).
  3. Service float as shown in Fig. 24.
  4. Reinstall, turn on water at saddle valve and test float.
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