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Flow-Through / Drip Style Humidifier Maintenance
Humidifier Components

Flow-through drip style humidifier components

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The flow-through style humidifier uses water dripping onto a specially coated rectangular metal or plastic evaporator pad add humidity to the air. These units have humidity controlled with a humidistat.
  • Competitively priced with the drum-style humidifier.
  • Stay cleaner than drum style humidifiers and are not prone to mold and bacteria growth.
  • Less maintenance than drum style humidifiers.
  • Reliable operation.
  • Consumes most water than any style humidifier.
  • Evaporative screen pads must be replaced annually.
    Perform the following maintenance tasks each month.
  • Turn off power to the furnace.
  • Turn off the water supply tap valve to the humidifier.
  • Pop open the clips that hold the inlet feed tube and distribution manifold in place at the top of the humidifier.
  • The water inlet feed tube will separate from the distribution manifold, then remove the manifold from the evaporative screen pad and the manifold housing.
  • The water distribution manifold may be plastic or metal depending on your style of humidifier. If metal, you may have to clean mineral deposits away with a chisel or flat blade screwdriver.
  • Check the evaporator screen pad. If it has scale clean it using a 1:3 solution of water to vinegar, or use a commercial calcium removing fluid such as Lime Away®. Soak the pad until the deposits dissolve. Rinse the pad with clean water and repeat if necessary.
  • If the evaporative pad has not had monthly maintenance it may have significant mineral deposits that flake off as the pad is bumped or twisted. If that is the case, then replace the evaporator pad with a new drip pad. Replace the evaporator pad annually.
  • Check that the humidistat is calling for humidity when the furnace is running. With the inlet fill tube located over the humidifier housing, open the water supply to the humidifier and turn the power on to the furnace. When the furnace begins running, the humidistat should call for humidity and the solenoid valve should open and water should come out of the water inlet tube and drain into the humidifier drain. If it does not, check the humidistat with a multimeter or voltmeter by checking for 24 volts across the fill valve / solenoid terminals / wires. If there is no voltage, the humidistat is bad. You can also do a “work-around” if you do not have a voltmeter. Turn the humidistat up to 80%. If the solenoid valve does not open and allow water flow, turn the humidistat dial setting down to 20% and then back up to 80%. You should hear a “click” sound coming from the solenoid valve. If you hear the clicking sound the humidistat is working correctly.
  • If the humidistat is working properly and there is no water flow from the solenoid valve, then the valve needs to be replaced.
  • Once all components have been confirmed as working, reassemble the humidifier.

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