Air Conditioning - VisionPro IAQ Programming Question

I had my central AC installed a couple days ago and it came with 2 visionpro IAQ thermostats...Does anyone know if there is a way to change the swing temperature on these thermostats...As far as I can tell the swing temp is set to a default of 1 degree...i would like to change it to 2 or 3, because yesterday i noticed my upstairs ac unit turning on and off too frequently...here is an example
stat set at 78 degrees
9:02 pm cooling on
9:15 cooling off
9:25 cooling on
9:35 cooling off
9:45 cooling on
9:55 cooling off
@ 10pm i have it set to 82 degrees so it didnt go on after that. It seems to me that turning the compressor on 3 times in 1 hour is too much. Is there a setting on the stat to say that if the outdoor temp (obtained from outdoor sensor) is less than a certain degree to not turn the system on?

Thanks

The paper work that came with them . Should tell you how to change it.

I didnt see it in the paperwork that came with them...I will look again
Thanks

Honeywell does not have the "swing" on their temp control, they are a smart t-stat, and since you just had this installed a few days ago, give it time to "learn" your home. When you say 2-IAQ, you have 2 system in your home? Where are they?

You can change the CPH "Cycle per Hour" from 3 to 2. Set up #220.

I am a proud owner of this t-stat and been very pleased with it.

I have 2 furnaces and heatpumps...one for the main floor and 1 for the second floor. each floor has their own IAQ...Is it possible for the t-stat to not turn on the ac if the outdoor temp senses has a reading less than the set temp for the stat? Which setting is the balance point for the heatpump...I dont see anything specific in the manual for balance point
Thanks

The IAQ does have an outdoor sensor, but is only used for heating mode on heat pump, and frost guard on humidifier in the winter.

Before I go on helping you on settings and what not.. I'd like to know for sure what you got for equipment.

Brand, model, BTU for each unit that are tied together, and what else you have (humidifer, EAC... UV light.. ect..)

Also, how big is your home sq footage wise.

the home is 3035 sqft
new eqpt is
Lennox XP16 2ton (main floor)
Lennox XP16 3ton(2nd floor)
AutoFlo s2020 steam humidifier
honeywell iaq for each system including outdoor temp sensor
auxillary heating is
#1
Model 310AAV042090ACJA
S/N 1806A16641
it says input 88000btu/hr
output 71000 btu/hr

#2
Model 310AAV042090ACJA
S/N 1806A16672
it says input 88000btu/hr
output 71000 btu/hr

Thanks...

The 310AAV042090ACJA is not a Furnace or Air Handler model# I search it and came up to a Transformer.

5 Tons of cooling is a lot.. but then I don't know where you are out of, how old the house is.

You got a two stage system. and with what you telling us the cycle rate/time, sounds like it's already oversized, unless the t-stat is not set up to a two stage system, and is running on full stage. (2nd).

the furnace is a Bryant 310 AAV/JAV...
We moved into the house in sept 2006 (it was built in 2006) and is in the denver area.
The manual J that was done called for 1.5 tons of cooling on the main floor and 2.5 tons fo cooling on the 2nd floor
The Lennox XP 16 does not come in 1/2 ton sizes so they did 2 tons and 3 tons. How can i tell if the stat is setup right??
I had about 4 or 5 contractor come out to bid on the job and each one came up with different size requirements even though each one did a manual J. The contractor i used did a manual J with an outdoor temp of 95 (which in the summer in denver we can often get over 100 degrees) and an indoor temp of 72 or 75, dont remember which...

When does the stat decide to use the Cycles per hour?? when the indoor temp is already reached??

I hate to say this....... Please forgive me!


You got to be kidding me what you got for this set up!?!?!

You got a $$$ 2-Stage heat pump onto a cheap builder's Single stage 80% system!?

On Set up #174, tell me what it's set at now.

Seeing as though the house is new and I wasnt offered any furnace upgrades at the time of construction, I did not feel it was worth it to put money towards a brand new furnace when the one i have is already new...

I will have to see what setting 174 says when i get home...Thanks for the help!

Ok, Keep us posted.. I am going out of town today for a wedding, so I may not be back till Sunday.

Reason I am not too thrilled about what you got, is that the blower on your current furnace is a single stage, it will blow at one speed, and I am just guessing they installing Lennox dealer just bypassed the 1st stage on your system.

If that 1st stage is bypassed, you are NOT getting what you paid for that Lennox to do. So if that 1st stage is bypassed, you are getting the FULL blast cooling, and will cause the system to short cycle often as you are saying.

so what should i be looking for on setup #174...I would guess it should be set @ 2

yes, should be at 2, and at the board there should be two wires on it to the outdoor unit. Y1 and Y2

By board i assume you mean the ICM board

Yes. on the ICM board.

Also take a look to see what you got from the ICM to the furnace. I am going to be signing off for the day..

See you on Saturday night or Sunday.

I looked at setting 174 on both stats and it is set to 2...setting 220 is set to 3 and it also has an E
One thing i noticed which is odd is that the adaptive intelligent recovery is set to off...
Y and Y2 on the ICM go into the furnace but i didnt trace them any further than that...

I did some digging around, and it seems like you may be Ok with this 2-stage on your single stage system. it just something I would NOT do myself.


The 220 E is "Auto Discovery", I would change the E to 3, and also 230 to 3.

Turn the AIR "Adaptive recovery" back on.

Take a closer look at the IMC Y and Y2 of where it goes on the furnace's board.

So the Y and Y2 wires form the ICm go into the furnace to a realy the installer put in and then out to the heat pump. When you turn on adaptive recovery is it for all modes (ie heat, em heat and cooling) how would you set just the cooling mode for adaptive recovery...Thanks for the help

As for the relay, sounds like that dealer knows what they are doing.. Can you tell diffirent speed sound on 1st or 2nd stage?

The AIR is used on both heating and cooling mode. AIR would be best to be on in heat mode.. It will try to use the heat pump much as it can in reovery mode, and only fire off the furnace if the Heat Pump can't recover from a set back.. Speaking of set back, don't set back too far back where it will have a hard time recovery.

I cannot tell between the different stages...I assume it starts in 1st stage(80%) and then will go to 2nd stage if needed, but have not noticed a difference in sound or if the unit even needed to go to 2nd stage. What determines if the unit goes to 2nd stage? is it if it cannot meet the inside temp within x minutes?

What do you mean by the setback?? Is setting 350 the "balance point" nothing says balance point in the installer setup guide. Setup number 345 is set to option 1...does that sound right?
Thanks again...very helpful

Some time a person may not notice from 1st stage to 2nd stage, Just have someone stand next to the furnace to hear a click on the relay, and sound of the blower.

The t-stat is a pretty complex program to figure out when the system needs to run 2nd stage or not.. it is not timed.

Set back meaning turning the temp down in the day or at night in heat mode, or turning up the temp in the summer.

Setting of #345, I'd use 2, if you got an outdoor sensor.

Then in #350 to 5 (Locks out Compressor, and only use furnace)

Set #360 to 40 (Locks out gas furnace)

I'll post back on here tmrw on what I'd suggest for set up on the whole system.

What is a good setback range...i have the cooling program setup as follows
6a - 80
8a - 78
6p - 77
10p - 82
People are home during the day so cooling is important during the day

heating schedule will be as follows
6a - 68
6p - 70
10p - 64

Not sure what ideal temperatures would be...there isnt a wide range between temps though in my schedules because people are in the house during the day
Thanks

The set points seems good. Is this the settings you have on both units?

Ok,

Here is what I'd suggest for the set up on your IAQ t-stat.

172- 2

174- 2

176- 1

180- 1

200- 1

210- 0

220- 2

230- 3

240- 3

280- 1

342- 1 (You got an outdoor sensor?)

345- 2

350- 5

360- 60

Do you have humidifer?

I have an AutoFlo s2020 humidifier
What doe sit mean by Conventional heat for 180...my furnace is gas
I assume 220 and 230 is for both AC operation and heat pump??
I do have an outdoor temp sensor on both stats...
Can you explain 350 and 360?
Thanks

humidifier is wired into the main floor IAQ...I only have 1 humidifier

My bad, yes 180 should be to 0

Is the humidifer tied to the IAQ or on it's own?

Yes, 220/230 is for the compressor for heat and cool mode.

Conventional, means that the furnace itself will control the blower on and off as needed for heat mode.

350 means is that the compressor is locked out when the out door temps reach at 5˚, and the gas furnace will then kick in to heat the home.

360 means is the gas furnace will not run when the temp is 60˚, just the heat pump only. Come to think of it, I'd bring it down to 50˚ or lower if you want.

Being that you got a humidifier on one of them, settings should be at.

370 -1

372- 3

374- 1

I think the installer said they determined that the heatpump would not be efficient below 40 degrees in this area so suggested the furnace kick in below 40. So forgive my ignorance but i am confused on 350 and 360
wouldnt the compressor lockout(350) be set to 40
and setting 360 be set to 40?

Oh man.. That heat pump will work well when it gets down into the teens. I've seen heat pump here in Minnesota doing well when it down into the teens and Heat pump now days work very well vs the older units from the 70's and 80's.

Also, with the 345 set to 2, the furnace will kick in if the heat pump falls behind 2˚

I am not sure if you got the same page or not?
http://customer.honeywell.com/Techlit/Pdf/68-0000s/68-0287.pdf

But above will do a great job of "showing" the set point on page 22, fig31

I don't think the t-stat will allow you to set both at 40, otherwise it will be fighting with each other.

Going back to the "Compressor Lock out" #350, if you guys find out you are not comfortable with the air temp, you can bump up the cut off temp of 5 to 10, or higher. but you are going to save a lot more money on using the heat pump much as possable than gas. The system will run, and that's fine.. the longer the run time, the better the comfort will be in the home.

The air temp from the heat pump will feel "cooler" than gas heat. but I have a feeling you may feel it since you do not have a true variable speed system, you are going to feel it.


Hope that helps. Feel free to ask if you got more questions.

thanks for the link...I will try these setting when i get home. in colorado we have a week or 2 where we get down into the teens and twenties...our winters are usually mild though, so i may in fact try a lower temp for the heatpump
Thanks

Good!

Yeah, I know your temps are not as extream as would would have here in Minnesota. of maybe -20˚ at times.

As for heating temps, you are best to "set it and forget it" on a heat pump.. but the setting that you've posted earlier, you should be OK with it.

You can run the heat pump down as low as it can go. On ours with the electric back up they run on down. But with yours and the gas back up Id set it for a 32o cut off and go to the gas furnace for heat. That way you dont have to put up with the unit going through a defrost. You for sure dont want that furnace to kick in as a back up with the heat pump on . At any time . You want just the heat pump on or the gas furnace not both. I hate to think of how high the head will go if they both come on.

Also, with the 345 set to 2, the furnace will kick in if the heat pump falls behind 2˚
Thats how it works with electric heat elements
There is Another control that should be on the furnace that will say from a outdoor sensor the changover from H/P to the furnace at what temp. That you set;)

Ed,

The IAQ has a wire going outside for the sensor to lock out the compressor at a set point, and also locks out gas heat at a set point. No other control is needed with the IAQ.

Jay
I see on the pdf that with fossil fuel you cant set the H/P lower than 30o. I take it then that is so the unit cant go into a defrost with the fossil fuel unit. So Id say you dont get to use the H/P to its max.

Might go to http://warmair.net and compare fuel cost for where he is. Could be it will pay to stay with the electric H/P for heat over the gas.

Ed,

Where are you seeing this that you can't set below 30˚?

-IAQ manual
or
-Another brand fuel kit?

I talked to the installer and they revised what they set them to instead of 40 deg balance point now they recommend 35 deg.

Go lower than that.... Give 20˚ a shot, and if you are comfortable, then leave it.. if you feel that you are cold, bump it another 5˚

We had heat pumps running at school down to the teens. and kept up just fine.

If you go below the 30o with the H/P. You will have to go into defrost some time. The gas furnace will have to come on so you dont get cold air in the home. So this hot air will have to blow over the AC coil. That is why here you set the H/P down to where it dont have to defrost. From there on down you are on gas furnace only. That company dont want the furnace to come on with the H/P in defrost. Just like our power company here.Our H/P's run all the way down to like 0o. But it will run so much even with the back up electric heat. Most people will turn the H/P over to EME or AUX what ever you have on the tstat at about 20o to 15o outside so the air dont feel as cool

Does this IAQ have a setting for minimum compressor run time...sometime the compressor runs for less than 10 minutes...seems inefficient, but i really have no idea what a normal runtime should be

No, it does not. Is both upper and lower system only running that short?

10 min does sounds short to me... Two stage system should run awhile. I have a single stage system, and mine runs 15 min or so when it's lower 80's. non stop if it 90's.

havent noticed which one is running short, I will have to make note of that or lower the temp in my house...I saw the trane thermostat has a minimum compressor time so thought maybe this did too..They look very similar

The Trane did??? I"ll have to look that one up.