ReplyIs it 20 degrees outside?Originally Posted by TRELL
Regular Guest
Installed a 2.5 ton h/p and a 96% nat.gas furnace all work good except for the heating mode. Has a Honeywell stat TH8320R1OO3. The problem is in heating only h/p runs, outdoor stat set at 20*however if swt setting to em heat the furnace comes on run just like it should. Goodman products.Have went thru sitting several times all looks well what you think?
Professional Member*
Is it 20 degrees outside?
Professional Member*
if it is set to run heat pump above 20° and furnace below 20°, what is your outside temp?
If above 20°, you only get the hp unless it is in defrost.
If below 20° you only get the gas furnace.
So is it working properly, you tell us.
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Regular Guest
set the heat pump lockout at 35 degrees and the dual fuel upstage timer to 1 hour.
Last edited by beenthere; 11-12-2013 at 07:15 PM. Reason: Restored post
Professional Member*
Did you go in and configure that stat correctly? You have to tell it the sensor is on, what type of system, and also that it is controlling the backup. I agree the lockout temp should be 35 or higher (I prefer 40 due to nuisance comfort complaints).
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Professional Member*
Are you referring to the Vision Pro's setup function using an outdoor sensor, or do you actually have a mechanical outdoor stat on this?
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Its working like it should. Its locking out the furnace because its above 20 degrees outside.
Professional Member*
It should not be based on a preference but on the balance point of the structure.
If the heat loss at 20 degrees equals the heat produced by the equipment at 20 degrees then the lock out should be 20 degrees, not a guess.
But you being NATE certified, already knew that I am sure.
New Guest
where do you live
Last edited by beenthere; 11-12-2013 at 07:16 PM. Reason: Restored post
Professional Member*
Alriiiiight! Finally, someone who knows about 'balance point'.
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Professional Member*
There are other factors to consider as well. Fuel cost: if gas is extremely cheap vs electric as it has been then the changeover point can be raised.
And comfort (!!!!).
If the homeowner doesn't like the cool discharge air of a heat pump running in a low ambient, or enduring defrosts with no auxiliary heat.
We usually set at 40 deg for that reason.
Our salesman is the savings guy. I'm comfort (I don't like callbacks). Between the two we usually end up with a pretty good system.
Regular Guest
lake Cumberland Kentucky.
Regular Guest
that is the balance point.
Regular Guest
gt it figure out. Thank yu'all for great info...
Regular Guest
I know im a few days late to chime in, but here in central nc i set ours 30-35 deg. For 2nd stage to come on. I have a co2 bottle i chill it down with if its not cold enough to come on by itself. Have used a bill porter board but not no more use either a honeywell or aprilaire duelfuel t stat. Just my 2 cents
Regular Guest
IMO the old pro 8000 honeywell was a good stat but I don't think i'll use a vision pro 8000 again...
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