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#218501 - 05/20/17 05:55 PM Heat pump conundrum  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,327
Alaska
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?


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#218502 - 05/20/17 09:04 PM Re: Heat pump conundrum [Re: sparkyinak]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,327
Alaska
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

#218503 - 05/21/17 09:37 AM Re: Heat pump conundrum [Re: sparkyinak]  
twh  Offline
Member
Joined: Mar 2004
Posts: 916
Regina, Sask.
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.


#218504 - 05/21/17 11:21 AM Re: Heat pump conundrum [Re: sparkyinak]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
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

#218505 - 05/21/17 08:49 PM Re: Heat pump conundrum [Re: sparkyinak]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,327
Alaska
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


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