Install, Test, Replace Furnace Humidistat - water feed, power, solenoid

Рет қаралды 27,951

4 жыл бұрын

Shows replacing a furnace humidistat and testing the water feed, power and solenoid, and explains its operation.
The first hint it is broke is the furnace humidifier is not getting water.
A humidistat either works as a separate device to control the furnace humidifier or is part of the central heating and air conditioning system.
Generally, set the humidistat for the optimal relative humidity level for comfort and for avoiding health effects to between 35 and 60 %.
Excess humidity is a breeding ground for mold, pests and rot in homes.
Find the control panel for the furnace humidistat, its usually near the furnace. With the furnace on, turn the humidistat very high, say 80%. If water flows, the solenoid works.
If no water, use your multimeter to test the voltage at its connection with the solenoid, then the humidistat is operating correctly. Check for 24-28 volts at your solenoid valve. If you have between 24-28 volts present, and water is not coming out of your solenoid valve, then the valve has failed and must be replaced.
There is no polarity when connecting the new humidistat. Attach either wire to either of the connections.
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Пікірлер: 15

@ianspencer4216 3 жыл бұрын

Gilberts used to be my local hardware store... I miss those guys, they are the best when you need the right equipment and the right advice...

@minoyang7721 3 жыл бұрын

I appreciate you. Following your procedure, I figured out that the switch caused my problem and I ordered a new switch to replace. Thank you very much.

@1new-man 4 жыл бұрын

Great post. TY Mr hardware God Bless!

@ziwu6373 Жыл бұрын

Thank you your video!! I have the same problem

@WayneDrops1952 2 жыл бұрын

Excellent instructions & detail. I have an Aprilaire 500. My problem is that the humidistat only operates at the highest setting about 50 & clicks off when I lower the setting & vice versa . My windows were very wet at that setting. I checked everything else which is fine. Is there any way to adjust that without buying a new one? Thank you.

@MrHardware1 2 жыл бұрын

Can’t say I know how to rebuild one, usually they last years.

@WayneDrops1952 2 жыл бұрын

@@MrHardware1 Thank you for the quick response, my good man.

@Dontfrgt1 2 жыл бұрын

Before I found your site I replaced the solenoid because no water was going to the humidifier. Water is feeding to the solenoid, still no water to the humidifier. The humidistat clicks when I turn it high. Is it possible that it is the humidistat? I was a little confused on how to check it. Thank you in advance for your reply!

@MrHardware1 2 жыл бұрын

Is the solenoid clicking? It can be heard and felt if you can hold it while turning up the humidistat. If no click take the wires off the humidistat and twist them together, if still no click I have taken the solenoid off the humidifier and used it as a tester, with the solenoid in your hand touch the wires on the solenoid to the 24volt transformer. The 24v output on the furnace transformer (while the furnace is running on heat mode) and check for a click. You just checked the solenoid if it clicks or not. If you have any doubt about this procedure don’t take the solenoid into the furnace, please. Blair

@CalitranoN 2 жыл бұрын

Aprilaire 560 I think mine is broke, i had it at 45 and were completely dry... cracked skin here, he mounted it in the living room under the thermonstadt...when it starts theres a click and water but i think it shuts off prematurely..

@MrHardware1 2 жыл бұрын

Run the drain hose into a large bucket and watch the water flow as your furnace runs. You should accumulate at least a 1 quart per hour. If not then there could be a restriction in the flow coming to the solenoid or a clog anywhere else in the line so there’s very little water going through the pad. That would explain it not performing.