ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
sec cable code conflict
by HotLine1. 11/19/18 02:34 PM
This anti-theist is priceless!!!
by Texas_Ranger. 11/17/18 02:15 PM
High current GFI vs regular GFCI
by Texas_Ranger. 11/17/18 02:07 PM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 8 guests, and 26 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Heat pump conundrum #218501
05/20/17 04:55 PM
05/20/17 04:55 PM
S
sparkyinak  Offline OP
Member
Joined: Jul 2007
Posts: 1,335
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?


"Live Awesome!" - Kevin Carosa
Work Gear for Electricians and the Trades
Re: Heat pump conundrum [Re: sparkyinak] #218502
05/20/17 08:04 PM
05/20/17 08:04 PM
S
sparkyinak  Offline OP
Member
Joined: Jul 2007
Posts: 1,335
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
Re: Heat pump conundrum [Re: sparkyinak] #218503
05/21/17 08:37 AM
05/21/17 08:37 AM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
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.

Re: Heat pump conundrum [Re: sparkyinak] #218504
05/21/17 10:21 AM
05/21/17 10:21 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,305
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
Re: Heat pump conundrum [Re: sparkyinak] #218505
05/21/17 07:49 PM
05/21/17 07:49 PM
S
sparkyinak  Offline OP
Member
Joined: Jul 2007
Posts: 1,335
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


"Live Awesome!" - Kevin Carosa
Re: Heat pump conundrum [Re: sparkyinak] #218747
09/14/17 12:07 PM
09/14/17 12:07 PM
D
David1  Offline
New Member
Joined: Oct 2016
Posts: 3
Ohio
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.

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
251,613 Are you busy
188,748 Re: Forum
178,459 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 15 (0.003s) Memory: 0.9771 MB (Peak: 1.1257 MB) Zlib enabled. Server Time: 2018-11-19 19:53:25 UTC