vision pro 8321 / trane803 thermostat opinions

[tundraotto]

I am very happy so far with my trane 803 thermostats - in order to try eek out that last bit of efficiency as far as the system is concerned..Question:

I have the thermostats set on maximum of 3 cycles per hour - if I change that to 2 and then adjust the temperature control 'aggressiveness' if I get undershoot - will I get anything as far as less startups - but the same awesome temperature control within that 1°F accuracy. Or is this a fools game?

the only bad thing I can see about the thermostats so far is that I cannot set the filter reminder for 20 days runtime - only 10,30,60,90??...

[lynn comstock]

The weather, the construction of your home and what it takes to satisfy you determine whethter you will like the performance at 2 cycles per hour max.

If the weather is hot enough, the home will overheat before the next compressor run cycle is allowed. It will not hurt the equipment. Personally, I recommend 4 cycles per hour max.

You spent a lot of money to deliver comfort. Don't compromise your comfort to save 20 cents a day.

[tundraotto]

i am fine with the energy consumption. My concern was regarding the start & stop of the compressor as related to compressor life... the default is 3 c/hr on the thermo...

[not a filter expert]

The problem I have with the stat is it doesn't actually control humidity, it overshoots setpoint. Honeywell took a lot of contractor's advice in creating the YTH9321 - the New Vision Pro IAQ w/humidity control

[tigerdunes]

Could the thermostat experts here state the features of these stats and pros/cons of each?

TCON 803

YTH9321

Vision pro 8321

Are they suitable for a dual fuel application?

Thanks for the reply.

[nina]

not a filter expert wrote:
>YTH9321

..and the YTH9421 ?

[smokin68]

While a big fan of the VP 8321, the one negative I have is that you can't set the staging setpoints manually(i.e. 3 degrees before 2nd stage kicks in).....the VP adjusts them on its own as it's a "learning" stat.

[nina]

I've been installing more Climatouch thermostats (CT03TS32H) than any of the VP's but am interested to get my hands on a Honeywell YTH9421 to see how it handles dehumidification.

The Climatouch of course is fully programmable to both time & degree differential for startup of Stage 1 vs. Stage 2

[not a filter expert]

I stand corrected!
TH8321 does not control humidity, overshoots setpoint.
Multi-stage stat, perfect for majority of applications.

Originally posted by nina
not a filter expert wrote:
>YTH9321

..and the YTH9421 ?

[tundraotto]

interesting - so is the 2 cycles/hour setting recommended over the 3 cycles/hour or will it make a hill of beans difference in regards to compressor life?

[mayguy]

Originally posted by smokin68
While a big fan of the VP 8321, the one negative I have is that you can't set the staging setpoints manually(i.e. 3 degrees before 2nd stage kicks in).....the VP adjusts them on its own as it's a "learning" stat.

Why would you want 3 degree for 2nd stage? that's a pretty large temp change.

I have the 8320 and been very happy with the temp control, never saw it fall behind last winter when it was -20 outside. it cycled 2nd stage on and off as needed.

[smokin68]

This isn't for a house....this is for a church where the units are oversized with multi-stages.99% of the time it doesn't need 2nd stage. Even to set it at 1 degree/2 degree you can't with a VP.

[tundraotto]

ok - now that we (hopefully) have all the other stuff on this thread out of the way. I am interested in the humidity control too but am much more interested in:

does reducing the cycles per hour to 2 have a substantial benefit in regards to compressor life or not?

[coolrims]

Tundraotto,

Please don't give up. I have the same question about my
Vision Pro 8000 (TH8321U). Incredible temperature control,
and not too bad at humidity control. I too wish it had a
20 day filter reminder.
In my situation, 10 days is too soon and 30 days is too
late. I leave the filter reminder at 10 days and change
the filter every other time it calls for replacement.

I have my cycles per hour at the default, 3/Hr. But if I
could decrease the system start-ups by a third, 2/Hr, I
feel that I will be adding years to the end of system
lifespan.

[not a filter expert]

There is no 10day filter reminder, options are as follows:

Function 500, operation manual states:

0 = off
1 = 10day run time (about 1 month)
2 = 30day run time (about 3 months)
3 = 60day run time (about 6 months)
4 = 90day run time (about 9 months)
5 = 120day run time (about 1 year)
6 = 365day run time (about 3 years)

Sound ridiculous...it is! Send an email to Honeywell.

THIS

Originally posted by coolrims
Tundraotto,

Please don't give up. I have the same question about my
Vision Pro 8000 (TH8321U). Incredible temperature control,
and not too bad at humidity control. I too wish it had a
20 day filter reminder.
In my situation, 10 days is too soon and 30 days is too
late. I leave the filter reminder at 10 days and change
the filter every other time it calls for replacement.

I have my cycles per hour at the default, 3/Hr. But if I
could decrease the system start-ups by a third, 2/Hr, I
feel that I will be adding years to the end of system
lifespan.

[not a filter expert]

Control humidity thru low speed, high speed, or external dehumdifier.

Best of all...ONLY 3-wires needed at the stat. New multistage installation updrades are a snap!

Originally posted by nina
I've been installing more Climatouch thermostats (CT03TS32H) than any of the VP's but am interested to get my hands on a Honeywell YTH9421 to see how it handles dehumidification.

The Climatouch of course is fully programmable to both time & degree differential for startup of Stage 1 vs. Stage 2

[smokin68]

Originally posted by tundraotto
ok - now that we (hopefully) have all the other stuff on this thread out of the way. I am interested in the humidity control too but am much more interested in:

does reducing the cycles per hour to 2 have a substantial benefit in regards to compressor life or not?

three 20 minute cycles or two 30 minute cycles, either way compressor runs for same amount of time, only difference is starts/stops, where the 2 cycle might save on the start winding dropping out, that's it. I doubt there's much difference in overall life. Your coils will probably leak before the compressor gives out if installed properly....

[tundraotto]

agreed - so this reduced starting would not reduce wear on the compressor to a degree to make it worthwhile from a longevity standpoint? just looking to tweak what seems to me a great system for the money.

[smokin68]

Personally, I'd prefer the air moving every 20 minutes instead of 30, for freshness sake. You can set her down to 2 cycles, won't hurt, I just don't think it means anything as far as compressor longetivity. Are you an engineer?

[tundraotto]

lol - thanks for the insult...lmao - no

fresh air? i hope that only comes from when I open the door.seriously - i know there is always air infiltration - but surely this would not increase by changing the cycle time...?