I have an AprilAire. It seems that when I turn the humidistat to the point
of right where it clicks on, the humidifier runs with each and every furnace
cycle. If I turn it until it just clicks off, it never runs with any
furnace cycle.

I guess I would expect that setting it right at the brink would make the
humidifier run occasionally. But my house goes from either being a desert,
to having moss and ferns growing on the walls.

Should it behave like this, or do I need to replace the humidistat? I would
be interested in hearing from other AprilAire owners.

I have the model that sits on the cold-air return side. The humidistat is
also on the cold-air return duct. Maybe that's part of the problem. Maybe
it should be on the hot side.

Buck Turgidson wrote:
I have an AprilAire. It seems that when I turn the humidistat to the
point of right where it clicks on, the humidifier runs with each and
every furnace cycle. If I turn it until it just clicks off, it never
runs with any furnace cycle.

I guess I would expect that setting it right at the brink would make
the humidifier run occasionally. But my house goes from either being
a desert, to having moss and ferns growing on the walls.

Should it behave like this, or do I need to replace the humidistat?
I would be interested in hearing from other AprilAire owners.

I have the model that sits on the cold-air return side. The
humidistat is also on the cold-air return duct. Maybe that's part of
the problem. Maybe it should be on the hot side.

You really need to check the installation manual to determine how that
should be set up. On mine the sensor is not a humidity sensor it is a out
side temperature sensor that reduces the humidity setting when the
temperature outside gets cold to avoid condensation on the windows. Your
owners manual should give you some information as well. Yours may be
different than mine.

Either way I don't think it should not run unless the indoor humidity is
rather high already. You may have a bad wire or connection.

--
Joseph Meehan

26 + 6 = 1 It's Irish Math

Buck Turgidson wrote:
I have an AprilAire. It seems that when I turn the humidistat to the point
of right where it clicks on, the humidifier runs with each and every furnace
cycle. If I turn it until it just clicks off, it never runs with any
furnace cycle.

I guess I would expect that setting it right at the brink would make the
humidifier run occasionally. But my house goes from either being a desert,
to having moss and ferns growing on the walls.

Should it behave like this, or do I need to replace the humidistat? I would
be interested in hearing from other AprilAire owners.

I have the model that sits on the cold-air return side. The humidistat is
also on the cold-air return duct. Maybe that's part of the problem. Maybe
it should be on the hot side.


Hi,
Maybe the 'stat is located in wrong place? Mine is on the living room
wall next to thermostat.
Tony
Tony

The unit I got last year is completely different than the one it replaced.
First thing to do is check your owners manual.
Second thing is to contact Aprilair.
Third thing is to repost here, with more information on what you have.

"toller" wrote in message
...
The unit I got last year is completely different than the one it replaced.
First thing to do is check your owners manual.
Second thing is to contact Aprilair.
Third thing is to repost here, with more information on what you have.


It is model number 560, as shown here. They have a humidistat that looks
like mine for $50. I'd guess I need to research it more to see if is
working properly.


http://www.ontimemall.com/aprilaire560parts.html

I have an Aprilaire that is the powered model. The humidstat goes on
the cold air return plenum. There is also a temp sensor that goes
outside. It's function is to reduce the humidity as the temp decreases
outside. From the behavior sited, it sounds like the humidistat is
bad. If it's set just short of the point where it would turn on, then
with the heating system running regularly, it should come on before too
long. Sounds like its broken and you essentially have just an on/off
switch.

Buck Turgidson wrote:
"toller" wrote in message
...

The unit I got last year is completely different than the one it replaced.
First thing to do is check your owners manual.
Second thing is to contact Aprilair.
Third thing is to repost here, with more information on what you have.



It is model number 560, as shown here. They have a humidistat that looks
like mine for $50. I'd guess I need to research it more to see if is
working properly.


http://www.ontimemall.com/aprilaire560parts.html


Hi,
If the 'stat is mounted on the cold air return duct, I don't think it's
measuring humidity of your living space, like your living room or
hallway. Wouldn't it be common sense? Actually RH is function of DEW
point which relates to temperature and moisture in the air. We are not
measuring absolute humidity, we're measuring RH in this case.
Tony

Hi Tony, hope you are having a nice day

On 16-Dec-04 At About 01:03:01, Tony Hwang wrote to All
Subject: AprilAire Humidistat

TH From: Tony Hwang

TH Hi, If the 'stat is mounted on the cold air return duct, I don't
TH think it's measuring humidity of your living space, like your living
TH room or hallway. Wouldn't it be common sense? Actually RH is
TH function of DEW point which relates to temperature and moisture in
TH the air. We are not measuring absolute humidity, we're measuring
TH RH in this case. Tony

Actually it is measuring space humidity. where do you think the return air
comes from?


-= HvacTech2 =-


... "And when you add them, they magically become one new number."

___ TagDude 0.92á+[DM]
++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++
spam protection measure, Please remove the 33 to send e-mail

HvacTech2 wrote:
Hi Tony, hope you are having a nice day

On 16-Dec-04 At About 01:03:01, Tony Hwang wrote to All
Subject: AprilAire Humidistat

TH From: Tony Hwang

TH Hi, If the 'stat is mounted on the cold air return duct, I don't
TH think it's measuring humidity of your living space, like your living
TH room or hallway. Wouldn't it be common sense? Actually RH is
TH function of DEW point which relates to temperature and moisture in
TH the air. We are not measuring absolute humidity, we're measuring
TH RH in this case. Tony

Actually it is measuring space humidity. where do you think the return air
comes from?


-= HvacTech2 =-


.. "And when you add them, they magically become one new number."

___ TagDude 0.92á+[DM]
++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++
spam protection measure, Please remove the 33 to send e-mail
Hi,
To be precise, it depends the location of 'stat on the duct in reference
of moisture injection point. My brother-in-law is a HVAC engineer.chief
estimator for major commercial outfit. I asked him what is "space
moisture" and he said, "What is it?"
Tony

Tony Hwang wrote:

...RH is function of DEW point which relates to temperature and moisture
in the air.

The dew point only depends on the moisture content.

The RH also depends on the air temperature.

Nick

Sorrr Toney, but I have to intergect. I think you have good intentions,
but, not a clue as to pyhsics. Dew point has to do with the saturation
point compaired to temperature, not relative humidity. Relative
humidity is just that...the relatioship of dry air molecules and wet air
molecules, absolute humidity has to do with the amount or wet air
molecules per pound of atmosphere.
Again your intentions are noble, but, you need to understand physics
before you quote any!!!!!
Lesson..........Dew point is the point at which saturation is reached
and the temperature corisponds to allow a change of state from vapor to
liquid...or...sublimation...look it up. A can of soda on a hot day
causes condensation on the surface between the two temperatures allowing
vapor ( water ) to change state to a liquid.
The question was one of Enthalpy, ever heard of that? Before you
respond do some homework and in particular the " Mollier " diagram.
And do not confuse Ethalpy with Entropy...there will be a test...lol
No offence intended, it is just that those that think they understand
HVAC trade, dont have a clue as to the true natureof physics, or the
laws of thermal dynamics.
Example.....If you think you do know these things..name, Charles,
doyels, and Boltons laws or pressure, temperature and volume, ......name
them and I willl then be impressed

Alice Beach wrote:
Sorrr Toney, but I have to intergect. I think you have good intentions,
but, not a clue as to pyhsics. Dew point has to do with the saturation
point compaired to temperature, not relative humidity. Relative
humidity is just that...the relatioship of dry air molecules and wet air
molecules, absolute humidity has to do with the amount or wet air
molecules per pound of atmosphere.
Again your intentions are noble, but, you need to understand physics
before you quote any!!!!!
Lesson..........Dew point is the point at which saturation is reached
and the temperature corisponds to allow a change of state from vapor to
liquid...or...sublimation...look it up. A can of soda on a hot day
causes condensation on the surface between the two temperatures allowing
vapor ( water ) to change state to a liquid.
The question was one of Enthalpy, ever heard of that? Before you
respond do some homework and in particular the " Mollier " diagram.
And do not confuse Ethalpy with Entropy...there will be a test...lol
No offence intended, it is just that those that think they understand
HVAC trade, dont have a clue as to the true natureof physics, or the
laws of thermal dynamics.
Example.....If you think you do know these things..name, Charles,
doyels, and Boltons laws or pressure, temperature and volume, ......name
them and I willl then be impressed

Hi,
Yep, I slipped my mouth there. Should read DEW point is function of temp
and mositure.
PV/T=P'V'/T'? Is that Doyels? D should read B?
Tony

Alice Beach wrote:

....

You might get more respect if you did a spell-check, Alice...

Even giving you the occasional typo, your spelling and grammar are
atrocious...

interject compared corresponds offense Doyle
it's "thermodynamics" not "thermal dynamics"

And, there's a definite relationship between dewpoint, temperature (wet
and dry), and relative humidity...it's how it's measured...the other is
reasonably correct, albeit not very precisely/well stated. (That is,
it's in the neighborhood, but nobody from CalTech is going to be calling
soon...).

As a heating and AC guy, I've installed more than several Aprilaire
humidifier. Sounds like you've got a bad humidistat. Yes, it's supposed to
be in the cold return side. Yes, some of them have a sensor that goes
outdoors.

Yes, replace the humidistat.

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.com


"Buck Turgidson" wrote in message
...
I have an AprilAire. It seems that when I turn the humidistat to the point
of right where it clicks on, the humidifier runs with each and every furnace
cycle. If I turn it until it just clicks off, it never runs with any
furnace cycle.

I guess I would expect that setting it right at the brink would make the
humidifier run occasionally. But my house goes from either being a desert,
to having moss and ferns growing on the walls.

Should it behave like this, or do I need to replace the humidistat? I would
be interested in hearing from other AprilAire owners.

I have the model that sits on the cold-air return side. The humidistat is
also on the cold-air return duct. Maybe that's part of the problem. Maybe
it should be on the hot side.

Stumped Moron posted for all of us....

As a heating and AC guy, I've installed more than several Aprilaire
humidifier. Sounds like you've got a bad humidistat. Yes, it's supposed to
be in the cold return side. Yes, some of them have a sensor that goes
outdoors.

Yes, replace the humidistat.


I guess i will leave this alone because nobody can get hurt or killed by
taking his advice; however wrong it may be...
--
Tekkie

What the hell are you implying is wrong? The Aprilaire modes do have a
humidistat thats mounted in the return and some models also have an
outside temp sensor. I know, because I have one and can also read an
installation manual.

Trader I don't think Alice knows what he's talking about. He's just trying
to impress people with something he literally knows nothing about, but
thinks he does.
I have an Aprilaire 600 and am well satisfied with it.


wrote in message
oups.com...
What the hell are you implying is wrong? The Aprilaire modes do have a
humidistat thats mounted in the return and some models also have an
outside temp sensor. I know, because I have one and can also read an
installation manual.

I believe everyone is entitled to their opinion, but do you comprehend
what you read??
First the statement I dont know what I am talking about......can you
tell me where I am wrong with any of my statements on physics or are you
just spouting off. There is nothing I have said about the laws of
physics that you cannot look up. Care to write back and prove me
wrong?? Not just with accusations but facts?
Second if you are comprehending what you read, you would realize that
I am not addressing the april-air issue, I am conversing with another
tech that is in the minority and one that should be sought after for his
skills and desire to be a true trouble-shooter.
I hope this does not fall into the catigory that your response does,
rather explain that a couple of knowledge-able techs are having a
conversation.
Again if I am wrong prove it, dont just spout that I am, any adiot can
do that.

You didn't mention the answer to the Alice question.
Three letters, starts with "O". Include application.

Bob wrote in message
news:x3Zwd.781099$8_6.126730@attbi_s04...
Trader I don't think Alice knows what he's talking about. He's just trying
to impress people with something he literally knows nothing about, but
thinks he does.

Who are you talking to?

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.com


wrote in message
oups.com...
What the hell are you implying is wrong? The Aprilaire modes do have a
humidistat thats mounted in the return and some models also have an
outside temp sensor. I know, because I have one and can also read an
installation manual.

I was replying to Tekki's post reprinted below:




Stumped Moron posted for all of us....



As a heating and AC guy, I've installed more than several Aprilaire
humidifier. Sounds like you've got a bad humidistat. Yes, it's
supposed to
be in the cold return side. Yes, some of them have a sensor that goes
outdoors.

Yes, replace the humidistat.



I guess i will leave this alone because nobody can get hurt or killed
by
taking his advice; however wrong it may be...
--
Tekkie

wrote in message
oups.com...
What the hell are you implying is wrong? The Aprilaire modes do have a
humidistat thats mounted in the return and some models also have an
outside temp sensor. I know, because I have one and can also read an
installation manual.


Bull****. Read the manual again.

And exactly what are you adding in the way of useful information, or
even any info at all? Any imbecile can take up posting space saying
"BS", it's only a little harder to come up with some facts, so what
exactly is your point? BTW, I don't have to read the manual again, I
installed one 5 years ago, it's just as I described and it's working
perfectly.