FM90 - Field Control® Fresh Mist Central System Humidifier

Freshmist 90
Owners Manual
Operation

Operation

  1. Set knob to the lowest temperature predicted for a 24-hour period. Because of differences in house construction you may want to try a higher or lower setting to achieve proper humidity.

    NOTE: Humidifier humidifies only when furnace is on, however, Media Wheel will turn whenever humidistat calls for humidity.
  2. Change knob settings as outdoor temperature changes occur.

    DO NOT LEAVE KNOB SET ABOVE "+20" OR HUMIDIFIER WILL RUN CONSTANTLY AND MAY OVER HUMDIFY YOUR HOME.

    IF SWEATING OF WINDOWS OR WALLS OCCURS OR IF AIR IS TOO DRY:
    Check dial setting. Indicator should point to the lowest 24 hour temperature. if setting does not agree, readjust knob to proper number and wait 24 hours for sweating to stop. If dial setting was correct and conditions have not changed, rotate knob back and forth from TEST to MINIMUM HUMIDITY SETTING. If humidifier goes ON and OFF, control is operating properly.

    SPLASH INSIDE HUMIDIFIER:
    This humidifier depends on the difference of air pressure between the supply air plenum and the return air plenum to propel air through the humidifier. Some furnaces have higher pressures than others. This could result in air traveling at high speed through the humidifier. This can cause droplets of water to be picked up and splashed against the inside of the humidifier case. Eventually a coating of lime will build up. It could in extreme cases, cause leaking of water from the humidifier. If possible, operate the furnace blower at a lower speed.

    TO REDUCE SPLASH:
    Partially close the damper located in the collar on the return air plenum. Some experimenting may be necessary to find the proper setting.

    AIR CONDITIONING - IMPORTANT:
    If your furnace has air conditioning (cooling), close the damper completely during summer months and turn the humidistat to the Minimum Humidity setting. BE SURE TO OPEN DAMPER DURING HEATING SEASON.

    CAUTION: Do not use tablets in an attempt to control lime deposits in this humidifier! Use of tablets may cause humidifier to splash causing damage to humidifier or furnace.
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