Honeywell VisionPro Therm Hum control

[MLeonhardt]

Just installed a Honeywell VisionPro thermostat with a Goodman Variable Speed AEPT air handler.

I noticed on the wiring diagram for the air Handler there is a jumper to be cut for the use of a Humidistat. On the diagram it is showing a seperate Humidsat . Would you cut this jumper if the Thermostat has a built in humidistat like the VisionPro , or would you leave the jumper closed ?

I know there is a few wiring experts on this forum. Would be interested in their thoughts.

Fort Worth , TX

[MB1211]

I wouldn't cut a thing. Call the original installer or a local reputable service company and have a professional wire it for you. If you start changing wiring in your unit you may void your warranty or worse yet damage a component.

[aintitfun]

call a tech, if it was just installed why are you messing with it? Let them take care of it, if you damage something, including the stat, it will not be warranty, and they dont exactly give those vision pros away.

[beenthere]

Your air handler doesn't know the difference between a stand alone humidistat, and a thermostat with a built in dehumidistat.

[MLeonhardt]

Your air handler doesn't know the difference between a stand alone humidistat, and a thermostat with a built in dehumidistat.

Beenthere,

That is why I asked the question. In the documentation for the Air Handler it states that the blower speed slows to 80% when de-humidification is taking place and the jumper is cut , but the VisionPro does not have seperate wires to connect to the airhandler for this purpose. So I take it that the blower speed is staying the same and the unit is just running longer to satisfy the thermostat de humidification.
As far as having a local tech out to do the job, I have had two of them here and both of them did not really know. They both talked with Goodman and Honeywell , but where confused with their answer. Right now the jumper is cut (by them) and they both tested for speed change and said that there was no speed change.

I asked the question on this forum, to see if someone here has run into the same situation with the AEPF A/H and VisionPro Therm. I was thinking that someone here has really wired up one of the same. It would take someone with hands on experience with the Goodman Variable speed unit I think to answer this question.

I forgot to mention that I have had two of these units installed and both of them function the same.

Thanks

[MLeonhardt]

call a tech, if it was just installed why are you messing with it? Let them take care of it, if you damage something, including the stat, it will not be warranty, and they dont exactly give those vision pros away.

Aintifun:

Don't worry about me causing damage and the warranty, I live up to my mistakes. In other words if I goof it up, I will take care of it. Sometimes it takes a lot of persistance to have things work the way they really should.

Thanks for your concern and answer .

[beenthere]

With the jumper cut, the blower is slowed.
The TH8321 does NOT have teh ability to control blower speed.
The YTH9421 does.
So you need to either add a duhumidistat, or a YTH9421(IAQ).

With the panels on, its very hard to hear the slow down. And now that the jumper is cut. You won't hear it, because its slowed down until an external control tells it to speed up.

[MLeonhardt]

With the jumper cut, the blower is slowed.
The TH8321 does NOT have teh ability to control blower speed.
The YTH9421 does.
So you need to either add a duhumidistat, or a YTH9421(IAQ).

With the panels on, its very hard to hear the slow down. And now that the jumper is cut. You won't hear it, because its slowed down until an external control tells it to speed up.

Beenthere:

That is exactly the same as my thinking after reading the Schematic. I will look into the IAQ. although after reading a lot of post about the IAQ I wonder if I will be getting my installer another headache that he wont enjoy. :rolleyes:

Thank you a lot for your answer Beenthere. Like I said before it sometimes take some persistence to have things work the way that they are designed.

[beenthere]

The IAQ is an intimidating looking thermostat when you go to wire one for the first time.
But it just takes a little common sense to wire it correctly.

[mayguy]

The IAQ is an intimidating looking thermostat when you go to wire one for the first time.
But it just takes a little common sense to wire it correctly.

I agree with him.. Lot of guys freaks out with the "remote board", and really they are not hard at all if they sit down and read over the I/O book that come with it..

I am very please with my IAQ.

[dwynne]

Beenthere:

That is exactly the same as my thinking after reading the Schematic. I will look into the IAQ. although after reading a lot of post about the IAQ I wonder if I will be getting my installer another headache that he wont enjoy. :rolleyes:

Thank you a lot for your answer Beenthere. Like I said before it sometimes take some persistence to have things work the way that they are designed.

My contractor commented that "your new IAQ will give the tech a nice challenge if he has not put one in before, he will have to sit down and read the book" :D .

As to having things "work the way they are designed" if you have the VisionPro TH8000 it does not have the needed connection to control your handler in dehumidify mode - no matter if you cut a jumper on the handler or not. It DOES have a humidity sensor but dehumidifies your home by over-cooling it. The Honeywell VisionPro IAQ is the one you want - it has the proper controls to run your handler in dehumidify more. I just went through this with several different contractors / suppliers telling me the 8000 was "just what I needed" to run a variable speed handler :rolleyes: . I have one Trane contractor tell me they never install humidity controls just let the "Comfort-R" handle it. Installing the humidity control "just makes it too cold in the house". I don't know nothing, but even *I* knew that is not correct with the proper control :confused: .

Dennis

[beenthere]

Right now the jumper is cut (by them) and they both tested for speed change and said that there was no speed change.


I forgot to mention that I have had two of these units installed and both of them function the same.

Thanks

PS: Have the techs reread the air handler install manual. I believe on that model, you need to do one more step besides cutting the jumper, for it to work.

Has to do, with it kowning how to tell if its in heat or cool mode.

[flange]

On VS air handlers in general, that jumper is used to let the board know to run at full speed. On a call for dehumidification, you would open up the jumper(contacts) on your humidistat to slow the fan. When humidity rises, contacts open, on a fall they close that is what tells the fan speed control what to do. This can be done with a tradititonal humidistat, or some other version such as an IAQ or other thermidistat. The important thing you need to know is whethor or not those contacts require an external 24 volt source. Seems to me like in this case not.

[dwynne]

The AEPT wiring supplement shows the jumper and the connection of the humiditstat which is wired to +24v and the "HUM" connection. Notes: "CUT HUM PJ6 JUMPER IF USING HUMIDISTAT. STAT OPENS ON HUMIDITY RISE."

With the jumper is cut you would need to supply +24v to the HUM terminal to keep the handler from coming on in dehumidify more and staying in that mode "forever", right? Or it might just lock the motor into the 85% speed when air is called for no matter what the humidity is?

So just cutting the jumper without a proper humidity control device would not seem wise.

Dennis

[beenthere]

Links to DIY sites are not permitted.
Edit it out.

[MLeonhardt]

Links to DIY sites are not permitted.
Edit it out.

Beenthere,

It is ok I do have the supplement manual that came with the A/H. But I sure do enjoy the expert advice and explanations. I just wish I would have joined this forum earlier. Some of the explanations point to the reason the techs had to use the option dip switchs to achive the correct airflow over the evaporator coil. the combination they used was on Dip switchs 7 and 8 for a 10 % increase in airflow ( humitdy jumper cut ) even though they had the right combination for the unit programed in. Got to give them credit for at least checking that out.

I also had read a little on the IAQ and most probably will go that route. Like many have said " It takes a little reading of the manuals " . I also can understand that during this part of the cooling season most of the techs are stressed out and the heat from the installs drag them down. Pretty hard to sit down and read the manual. There are so many options today that it makes up a good system, I am amazed at how all of you handle it.

Mike

[beenthere]

Lots of reading and practice. :)

[MLeonhardt]

The AEPT wiring supplement shows the jumper and the connection of the humiditstat which is wired to +24v and the "HUM" connection. Notes: "CUT HUM PJ6 JUMPER IF USING HUMIDISTAT. STAT OPENS ON HUMIDITY RISE."

With the jumper is cut you would need to supply +24v to the HUM terminal to keep the handler from coming on in dehumidify more and staying in that mode "forever", right? Or it might just lock the motor into the 85% speed when air is called for no matter what the humidity is?

So just cutting the jumper without a proper humidity control device would not seem wise.

Dennis

Dennis,

This is the most precise explanation yet ! Thanks a lot for the post I really appreciate it. Will let you know how the unit works after it is redone. I have been reading a little on the IAQ but I have about 99 percent of what is needed now and will have to decide which way to go. I have some good techs, but you probably know how it goes when you are covering a lot of issues on new installs. I have learned a lot from all the posts.

Mike

[MLeonhardt]

Flange:

Looks like you had this one right. Thanks for the help. I will post you on what happens.

I guess it pays to ask questions !

[beenthere]

Reread the manual. Most people miss one very important little detail.
And if you miss it, it won't work.(AH manual)

[MLeonhardt]

New Vision Pro IAQ installed friday...guess what ! It works the way it should and the explantions from all of you really helped. The Tech was happy too. He took out the manuals and read them when I called. When he showed up it took him about 1hr and the job was done. ;)

Thanks for your assistance.

Mike
Fort Worth,TX

[beenthere]

Good, glad to hear it.

[Only One Nurse]

I bought (what I thought was a top shelf product) a Honeywell VisionPro IAQ thermostat for our ranch home in WV based on various research available to consumers. The thermostat does basic functions out of the box (heat, air, scheduling). These were the same functions that my cheap, simple thermostat did. This is what happened: 4 visits by the contractor that installed both the new 2-stage furnace/air conditioner. After each unsuccessful attempt to get the thermostat to perform advanced functions I pleaded by phone with Honeywell customer service, located overseas and by eMail. I wanted help me utilize the seemingly convenient and energy saving functions. The response was a polite "No" with the rationale of consumers do not have the knowledge to program this thermostat (and I respect that). However, how was I duped into this expensive venture (think about it, the thermostat is expensive and throw in all the HVAC house calls). I am happy for those that got theirs to work.

[mayguy]

I bought (what I thought was a top shelf product) a Honeywell VisionPro IAQ thermostat for our ranch home in WV based on various research available to consumers.
It is Honeywell's Top of the line t-stat.


The thermostat does basic functions out of the box (heat, air, scheduling). These were the same functions that my cheap, simple thermostat did.
True, it can do what a basic t-stat can do, and can program it to run 2 stage heat pump along with 2 stage gas heat back up, control fresh air, and control humidity.



This is what happened: 4 visits by the contractor that installed both the new 2-stage furnace/air conditioner. After each unsuccessful attempt to get the thermostat to perform advanced functions

What functions were you/they trying to get, and was not able to get it?


I wanted help me utilize the seemingly convenient and energy saving functions
Do you mean programing of the t-stat to do set back of temp settings?

[beenthere]

However, how was I duped into this expensive venture (think about it, the thermostat is expensive and throw in all the HVAC house calls). I am happy for those that got theirs to work.

The problem may be more of a contractor problem. Then a thermostat problem.
Many contractors/service/install techs don't read the instructions, and that is why the stat doesn't seem to work for some.

As Mayguy asked. What features are you trying to set up, and use?

Read the install manual.

[dwynne]

The problem may be more of a contractor problem.

It took my contractor 2 trips by 3 different guys and they STILL left if with the t-stat programmed backwards for humidity control. The last guy did get it wired correctly, but had the programming wrong so that the "dehumidify mode" in the air handler was called when the humidity was too low rather than too high.

Nice stat, but confusing to many folks how to install and program even if they read the instructions :D .

Dennis

[beenthere]

It took my contractor 2 trips by 3 different guys and they STILL left if with the t-stat programmed backwards for humidity control. The last guy did get it wired correctly, but had the programming wrong so that the "dehumidify mode" in the air handler was called when the humidity was too low rather than too high.

Nice stat, but confusing to many folks how to install and program even if they read the instructions :D .

Dennis

The first time installing it, it can be intimidating to techs not well trained in low voltage wiring/control.

But everything a tech needs to know about installing it, is in the install manual. And if they read both the IAQ's install manual, and the equipments install manual, its easy to wire, an set up.

Just many don't read manuals.