View Full Version : TH8320 Stage Logic
02-03-2006, 10:36 AM
If this is in the docs, then I missed it. What logic does this stat use for stage firing in a 2-stage situation? Are there simple hardwired rules for that or is it part of the fuzzy nature of the programs. At a minimum, I'm trying to figure out if it goes straight to the second stage when in recovery mode. Thanks!
02-03-2006, 11:41 AM
If wired correctly, it will go straight into second stage during recovery mode if temp difference is >1F.
02-03-2006, 03:37 PM
During maintenance cycling, I believe recent 2-stage Honeywells use logic like "if after x minutes on first stage, you haven't made sufficient progress toward the setpoint, switch to second stage"... so basically it only uses second stage for maintenance if it sees that it's starting to lose ground after having run the first stage for 10-15 minutes or so.
02-03-2006, 04:19 PM
I believe that I read on another thread before that in maintenance, stage 2 will kick in if stage 1 is engaged 80% of any given hour. It will then switch back and forth between stage one and two. That would also be in line with what I have observed on my system, once. This winter has been so mild that I only observed it once so far.
02-06-2006, 08:28 PM
Hey Nord64....how is it going? How goes it with your new system. Are you getting used to the VP yet? yep, the winter has been so mild its hard to tell what is happening with the furnace. Mine does kick into 2nd stage for a bit during recovery, but since I am using the AR, it does mostly hang on the 1st stage. Hope all is well....catch you soon
02-06-2006, 09:12 PM
I'm doing well and I like my VP. My system is is running smooth but I had the HVAC pro come back. Had water in the top furnace compartment just a little puddle which left behind a little white stain on the metal. Turns out the hoses where loose for the condensing water. I'm glad I have kept a close eye on the system. Also, it gave me time to ***** about some of my install issues. More asthetic than mechanical I'm thinking of posting the pictures on a thread. It's the way they have broken through the exterior wall for venting i.e. PVC pipes.
It's quite rediculous might be worth to post on the wall of shame. But as I said the furnace is running well and the T-stat is just perfect with the system. I run the Circ Fan at night only and love that. Looks like we get a little colder here high teens (F), nothing bad but a lot colder than what we had during the past 6 weeks.
I run a little more on 2nd stage because of my setbacks but the furnace is keeping up well in first stage with the current weather. So all in all I lucked out with a pretty good set up given the horror stories I read about. All the research did pay off afterall. I whish we would get a good cold spell for 2 weeks to see what the furnace can do under pressure:) I know it would costs a little but want to have a good test before the warranty runs out.
Hope all is well. N64
02-06-2006, 10:00 PM
Great. I had some issues with install as well, but sometimes the retrofit can be pretty difficult. The installer ran the vent pipes out underneath my living room window so the steam is kind of annoying to see. They did a bit of a bad job hooking up the return, but all and all it was a decent experience. I am still useing the Adaptive Recovery....it seems to work pretty well here. The gas prices are pretty high here so I did not save much over last year, but did use less therms, but it will be a while before i can really tell if this was a good investment. I do the circ at night as well. I think it is best when you set back to 62 or lower, but really I have not tried it with continuous so I am not sure it makes too much difference. Glad all is well......never thought i would hear someone ask for colder weather......hahahaha..........catch you soon..
02-06-2006, 10:45 PM
natural gas prices are high...thats for sure, at least for North American standarts. It's about CAD $1.15 per therm here not to bad but I'm also not the average consumer. When I talk to my neighboor... monthly bills of CAD $450 to $600 per month, jikes. I have not even hit $150 yet and Jan looks lower than Dec, 51 Therms since Jan 13. As you said it will take a while to see how much the savings will be. I bought the furnace for peace of mind....the old one was 25 yrs old and getting shaky so a good brand name will help selling the house if I decide to do so.
Efficiency is hitting the main stream...even in North America. The easiest/Cheapest Barrel of Oil is the one we conserve same is true of all natural resources. I'm not expecting to get all my investment back unless we will get some cold winters, but I feel good and have peace of mind for years to come.
A different approach... I know.
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