Sorry for not getting back to you right away, a day off today, and been out and about doing things before the storm came in tonight.
Quote:
Originally Posted by Puchatek  Yes, they used my existing outdoor temp sensor. |
Are you getting outdoor temp reading on the stat? From what I understand, the outdoor sensor has to be a Honeywell matching sensor, not another brand, otherwise, the reading is off.
Quote:
| Returning to the W1/W2 issue... How exactly does the thermostat determine when Heat2 is needed? |
On the IAQ there is 2 ways the stat will decide if 2nd stage is needed.
-Room temp is lower than set point.
-When first stage has reach it's 80% capacity.
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| Why is it better than the timing algorithm that the furnace employs? |
This furnace has no algorithm at all, just a timer... It's a fixed 10 minutes (or 15).
Give you this ideal here..
Timer;
You come home to a cold house, and you calls for heat. The furnace fires off in 1st stage, and you are wanting heat "now", and you have to wait 10 minutes for it go into 2nd stage.
Two stage stat.
The furnace will fire off right away in 2nd stage and you are getting your extra warmth right away.
or
Timer;
A cold winter night, the furnace runs 2nd stage after the timer has run out, and then the temp has met it set point and shuts down... Could lead to cool spot some where in the house.
Two stage;
Furnace run 1st stage majority of the time, and if the stat sees that 1st stage can't keep up, it will fire off 2nd stage to help out, and runs that 2nd stage long enough to help out, and drops back to 1st stage providing soft even heat all over the house.
My parents has a two stage furnace, and had a single stage stat and furnace ran on a timer... The furnace didn't run long enough to really warm up the basement family room.. (cycle on and off) and I upgraded them into the 2 stage stat, and now the furnace runs much longer in 1st stage allowing the basement to warm up to more comfortable temps.
I have a split level house, and all the rooms up and down are with in =/-1˚ from each other with a nice long run time in our cold -20 winter nights.
Oh I was going to ask, where are you out of?