Question about Aprilaire 600 Humidifier

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Not getting enough humidity in the air

My Aprilaire 600 appears to be operating properly, however,the humidistat never registers above a "1". FYI-The unit is attached to the intake ductwork and the humidistat is also mounted on the intake ductwork.

Posted by Bob Buccari on

  • zetetikos Dec 30, 2007

    Mine seems to run fine but the humidity is my house is unchanged. Water is going in - mesh is wet, air is blowing through. - etc. but humidity unchanged in house. Can't figure out what could be wrong

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1 Answer

Anonymous

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There are 3 things to check on the humidifier. Check the metal mesh screen, is it wet after the humidistat is call? If it is dry the water solenoid my not be opening or the nozzle is plugged. The circulating fan blows air through the wet screen to add humidity. Does the fan spin when the humidistat is calling? There is an intake and exhaust on the humidifier. Check that the metal was cut out properly when the humidifier was installed to allow air to feely circulate?

Posted on Sep 24, 2007

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1 Answer

Air inside house feels dry. Not sure if humidifier is workng. 1. regardless of outside temp (between 10 degrees and 40 degrees F) the humidity never goes above 28% even with the humidistat turned to the...


Hi,
Sounds like you are not getting the proper voltage to the solenoid valve...
Check for 24v coming off of the transformer...that may be 24vac not vdc...

Then check to see if there is power coming from the humidistat...
unhook the wires to check for the power at the solenoid valve...
check across the two wires...

if there is power the valve is bad and that alone will cost about 90 bucks with shipping...
if there is no power trace back and see where the power stops at...

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1 Answer

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It sounds like you got it...

The solenoid will not open with only 13 volts to it. Jump or apply the full 24-27 volts to the solenoid and see if it clicks and opens and allows water to flow.

If the valve still won't open or pass water, start looking for a plugged inlet solenoid inlet screen or a faulty solenoid valve as well as a faulty humidistat.

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TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1
10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%

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