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Why do I hear some people say not to trust a humidistat?

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Because they don't trust humidistats. Because they don't know what to expect a humidistat to do, or how accurate to expect the humidistat to be. Or, perhaps because they actually had experience with a humidistat that wasn't working properly.

Posted on Jul 24, 2008

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will not blew very good heat and shut down with stop light came on it dose work for 30min after i drain the water but it go back to the stop light again then the will for about1min or so then it shut again

Nov 04, 2013 | Aprilaire 4655 Manual Humidifier...

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Diagram wiring

You could replace the Thermostat with one that allows you to to set it lower, or get a different humidistat that goes from 0-90 , There is always ways around, Thus this great website.
If you need more details or where to purchase let me know.

Oct 10, 2013 | Danby DPAC12099 Air Conditioner

1 Answer

The unit seems to fill up real quickly

That's probably because your indoor air is so humid. Buy a humidistat for your home to see what the relative humidity is. Some fancy clocks come with a built-in thermometer and humidistat.

Jul 21, 2011 | Heating & Cooling

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I have an existing honeywell thermostat - 4 wire hook up. I added a honeywell humidistat. I hooked it up for series operation meaning when we leave the house in south Florida for the summer, the humidstat...

That 's a really good idea. My question would be is that a two wire humidistat? If it is. you would have to parallel the wires. One wire on the "R" on the thermostat and the other would go on "Y" and jumper to "G". Really interesting , I would like to know if it works. I live in Okla. and we have real high humidity summers but probably not like Florida. Hope this helps you.

May 14, 2011 | Honeywell Heating & Cooling

1 Answer

We have just had a Honeywell H46C humidity controller installed. The technician told us to set both the humidistat and digital thermostat at 65 degrees when we leave the FL condo for the summer. Is this...

If you are leaving for SUMMER, definitely do not need to set at 65, that would be tremendous waste of energy. Humidistat in summer should be off. I wonder if he thought you would be gone during winter.

Feb 04, 2011 | Honeywell Heating & Cooling

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I replaced my old Aprilaire 445 humidifier with a new 600M and also replaced the humidistat. Neither the new or old humidistat is activating the solenoid for the water flow. We have water at the...

Hello, you need a means of allowing 24 volts to the solenoid and this can be done by either a sail switch or current sensing relayrobhvac47.jpgCurrent sensing relay

robhvac47_0.jpgSail switch

Dec 28, 2010 | Heating & Cooling

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Hi I have an alto extractor fan in my bathroom but it doesn't activate when I turn on the light. Any ideas on how to fix it? Thanks

you may have a fan operating from purely from a built in humidistat instead of being operated from the light switched . If that is the case an electrician may be able to alter the wireing to have the light switch overide the humidistat, or even adjust the integral humidistat to a lower setting and operate the boost at a lower relative humidity level.

Aug 15, 2010 | Heating & Cooling

1 Answer

Collecting very little or no water

Given all other variables are the same (location, average humidity, humidistat setting, etc.) I would speculate either:

- the compressor is not running as much as before, or
- the evaporator is icing up and blocking ariflow, or
- the compressor is not getting evaporator coils cool enough, or
- the fan is not running at top speed.

Have you checked for icing?
Has the humidistat setting been inadvertently changed?
Does the fan seem to be operating normally?
Do you hear the compressor "kicking in", or is it just the fan you hear?

May 07, 2009 | Heating & Cooling

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I can not get the humidistat to regulate the humidity levelin my house to match the hygrometer reading.

You will need a better instrument to test to see which one is off the humidistat or the hydrometer.

Nov 26, 2008 | Honeywell Heating & Cooling

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