How to maintain a furnace-mounted humidifier

A central humidifier is a special piece of HVAC equipment fixed to the furnace that adds water vapor to the air discharged from your furnace. What should humidity level be in house in winter (There are also stand-alone humidifiers for use in a single room.) Humidifiers are used primarily in the winter heating season when humidity levels are low, as evidenced by frequent static electricity discharge, dry skin or nose bleeds. What should indoor humidity level be in summer Newer tightly constructed homes have much less air infiltration than older homes. What should the humidity be in my house canada As a result, humidity levels are more easily maintained, reducing the need for a humidifier.

There are three main types of central humidifiers you may find in the home. What should the humidity be in my house during summer However, this tutorial will address maintenance of the reservoir and flow-through types, the two most common types of humidifiers and the two which also require the most maintenance for proper operation:

• Reservoir humidifiers use a rotating drum-styled foam pad or similar media that picks up water from a float-controlled reservoir for evaporation.

• ​ Flow-through drip-style humidifiers use a specially coated metal or plastic screen that has a small amount of water constantly dripping across it while the furnace is running.


• Steam humidifiers contain self-generating steam heaters and are the most expensive, lowest maintenance and most efficient design. What should the humidity be in my house uk However, these humidifiers require that water has a certain range of hardness and quality. What should the humidity level be in a home Some homes may require filtration options to alleviate problems with water quality and hardness.

• If not properly maintained and cleaned often, the water reservoir may house stagnant water that can become a breeding ground for bacteria and mold, and may cause sickness.

• Remove humidifier drum and check the pad. What should the humidity level be in a house If it is hardened from mineral deposits, try to clean it using the approach described below. What should the humidity level be in my home If that does not work, then the pad must be replaced.

• Remove the foam pad from the drum shaft by removing the clips or other fastening mechanisms on the center shaft and pulling the two drum shaft halves apart.

• Clean the foam pad by using a 1:3 solution of water to vinegar, or use a commercial calcium removing fluid such as Lime Away®. What should the humidity level be in my house Soak the foam pad until the deposits dissolve. What should the humidity level be in your house Rinse the pad with clean water and repeat if necessary. What should the ideal humidity level be in my house If the pad is ripped or does not come fully clean, replace the foam pad.

• Replace the cleaned or new pad, and reinstall the drum to check for proper water level. What would cause high humidity in a house Check owner’s manual for the proper depth if the unit does not have a marking in the reservoir showing proper water level.

• To raise or lower the water level, adjust the float arm. Whats the normal humidity level in a house There is usually an adjusting screw that attaches the float to the float lever arm.

• The water inlet feed tube will now 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 the humidifier. Acceptable humidity level in home If metal, you may have to clean mineral deposits away with a chisel or flat-blade screwdriver.

• Check the evaporator screen pad. Acceptable humidity levels in a house If it has a scale, clean it using a 1:3 solution of water to vinegar, or use a commercial calcium – removing fluid such as Lime Away®. Acceptable humidity levels in house uk Soak the pad until the deposits dissolve. Acceptable humidity levels indoors 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. Average humidity in a home If that is the case, then replace the evaporator pad with a new drip pad. Best humidity level for home in summer Replace the evaporator pad annually.

• Check to make sure that the humidistat is calling for humidity when the furnace is running. Best humidity level for home in winter Using the inlet fill tube located over the humidifier housing, open the water supply to the humidifier and turn the power on to the furnace. Best humidity level in a house When the furnace begins running, the humidistat should call for humidity, the solenoid valve should open, and water should come out of the water inlet tube and drain into the humidifier drain. Best humidity level in home If it does not, check the humidistat with a multimeter or voltmeter by checking for 24 volts across the fill valve/ solenoid terminals/ wires. Best humidity level in house If there is no voltage, the humidistat is bad. Best indoor humidity level in summer You can also do a “workaround” if you do not have a voltmeter. Best indoor humidity level in winter Turn the humidistat up to 80%. Best level of humidity in home If the solenoid valve does not open and allow water to flow, turn the humidistat dial setting down to 20%, and then back up to 80%. Comfortable humidity level in home winter You should hear a “click” sound coming from the solenoid valve. Comfortable humidity levels indoors uk If you hear the clicking sound, the humidistat is working correctly.