Aprilaire 400 cannot increase the humidity higher than 30%

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Old 01-26-16, 11:14 PM
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Aprilaire 400 cannot increase the humidity higher than 30%

My house in Colorado is a single family house with 1725 finished sqf and 870sqf unfinished basement, built in 2006. The house has a living space of around 400 sqf with high ceiling.

I installed an Aprilaire yesterday and set the humidity level on the automatic control to 7, the outdoor temperature in my area is around 30F according to nearby weather station. Per the user manual, I should expect the humidity of 45% in my house.

However, when I woke up and checked the humidity level the humidity level is only 30% and the humidifier was still running.

I tested 1 more time today and the humidity is always around 30 or 31% even the humidifier was running from 6pm to 11:30pm.

Is there any reason why the humidity level in my house is around 30% only?
I know Colorado is really dry due to high altitude and cold weather but 30% seems too low.

Another question is How long does it take to increase 1% of humidity by the Aprilaire 400 humidifier? My Aprilaire 400 takes 4 hours to increase from 28% to 30%. It seems to slow too me.
 
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Old 01-26-16, 11:18 PM
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This is weather information near my house:
Highlands Ranch, CO (80130) Forecast | Weather Underground
 
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Old 01-27-16, 12:29 AM
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The cold dry air leaking into your house is absorbing all the humidity. At that temperature you don't need 45% humidity. There is no set rules with a humidifier. Every house is different. Raising the percentage of humidity in a house a couple of percent is usually enough to offset the dry air effects.

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Old 01-27-16, 12:56 PM
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Thank you for your answer, PJmax.

I just concern that the humidifier may under-perform its capacity.
It had to run the whole night yesterday just to keep the humidity level at 30%.

My house recently has been energy-audited and I don't think leaking is the problem.
 
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Old 01-27-16, 04:32 PM
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How does the air feel ? Dry throats ? Static shocks on nylon ? Any windows sweating ?
 
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Old 01-27-16, 10:23 PM
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I notice a little change but my wife feels nothing different.
Dry throats: Still have but not as much as before.
Static shocks: Still have but much improved
Windows sweating: No

I think the humidifier is working under-performance because of standing water, when I touch the filter, it feels like 1/5 bottom of the filter have moisture.
I will convert Model 400 to Model 600 by replacing plungers with a couple of magnets to make the water always running.

Sorry for my English!
 
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