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Joined: Jul 2007
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I'm having an issue with a new heat pump with an in duct coil. Using the existing furnace for fan and emergency heat.
I can't call the factory until Monday. Calling for heT I have 24V between R and C, and R and O plus I have power to the fan. I can't get the heat pump to fire. Any thoughts?
"Live Awesome!" - Kevin Carosa
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Joined: Jul 2007
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Maybe this will help. Each column is a piece of equipment in the puzzle and how they are connected. Hope this view properly at your end. Thermostat is Heatpump enable
HP=Heat pump Furn=Furnace force air Tstat=Thermostat
Tstat Furn HP
[R]-----------[R]--------[R] Heat [C]-----------[C]--------[C] Common [AUX/E]-----[W]--------[R2] Emergency heat [OB]--------------------[O] Heat/cool valve [G]----------[G] Fan [Y]-----------[Y]--------[Y] Cooling
"Live Awesome!" - Kevin Carosa
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Joined: Mar 2004
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Calling for heat, should O be energized and read 24 volts to C? That would be zero volts from O to R. I think OB is the same as W which is 1st stage heat.
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Joined: Jul 2004
Posts: 10,007 Likes: 37
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Does it run in "cool"? If not, be sure the time out relay is OK. These things use a time delay relay (usually solid state) to prevent short cycling. Some times you have to wait a minute or two to see if it is going to go.,
Greg Fretwell
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Joined: Jul 2007
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Crap! Your right. It's been ages since I dealt with furnace controls. Before electronic stats. The R is or was commonly called common. It should be 24v between Orange and Blue, not red.
The furnace in question still called the R, common and W for heat. It tripped me up once already. Grrrrrr!
Thanx
"Live Awesome!" - Kevin Carosa
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Joined: Oct 2016
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Greetings Ya'll,
It looks like this got "Cleared up" back in May 22, 2017.
I'm curious as to how it turned out, & also why a "Duct Coil" was used, instead of an "A" Coil in the Plenum.
When you Stand for The Truth, Sometimes you Stand Alone.
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Posts: 109
Joined: January 2005
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