Heat strip on when in fan only mode - http://www.hvacmechanic.com/ Forums
Original message
| FranklinRod
|  "Heat strip on when in fan only mode"
, posted Thu 23 Oct 19:58  
The SECO TA2000 thermostat was set in cool/normal/auto mode. Then for the first time since I moved into this place I placed the thermostat in cool/normal/fan only mode. After a few moments the Auxiliary Heat LED lights and not so cold air blew from the ducts. Smelled like electric heat. Switched the thermostat to off/normal/fan only and it's hot air blowing from the ducts. Aux. heat LED still on.
Something is not right.
So, there's the SECO TA2000 thermostat, the blowers/aux. heat strip/etc. inside and the Bryant 661CJ030A heat pump outside.
Here's how things are wired:
...... are just space holders so things line up
Thermostat.....blower/heat....outdoor unit
B.....no wire
W2.white----------white------------white
O....brown----------------------------brown
X....blue------------brown-----------blue
R....red--------------red--------------red
Y....yellow---------green------------yellow
G...green----------green............x-green (just hanging there)
E....no wire
Is this thing wired right? Clue me.
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Replies:
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| cubstakeseries
| "Re(1):Heat strip on when in fan only mode" , posted Fri 24 Oct 08:02
Y should not be hooked to the airhandler, just to the outdoor unit. W2 is usually hooked to the heat sequencer so that is where you would have the problem. Do you have a volt meter to check voltage at W2 at the airhandler?
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| | FranklinRod
| "Re(2):Heat strip on when in fan only mode" , posted Fri 24 Oct 12:14
I have lots of tools and can follow any instructions you would be kind enough to provide.
I am a little confused about your statement that there should be no connections to the air handler. They way it looks to me, and I certainly might be wrong, is that the four wires at the air handler are connections to relays. There is separate 220V power input to the air handler.
To clarify a little about my wiring description. The thermostat connections are pretty easy. They were observed right at the thermostat. The wires from there ran up behind the wall and that group of wires meet the set of wires going out to the outdoor unit at the air handler where the four wires from the air handler are, and everything is wire nutted together right there. It is at this point where I made the wiring observations written about in my previous post. The air handler has the four wires mentioned just stubbed out, and a separate input for 220V running in flex. I have not at this point observed where the wires connect to the outdoor unit.
I found this about the TA2000:
B = C/O valve heat = .....................no wire
W2-Aux. heat - ..............................white
O - C/O valve cool - .......................brown
X - Common - ................................blue
R - Power - ....................................red
Y - Compressor - ...........................yellow
G - Fan - ........................................green
E - Emergency heat - .....................no wire
Hit me!
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| | cubstakeseries
| "Re(3):Heat strip on when in fan only mode" , posted Fri 24 Oct 18:36
Inside the airhandler you have heat sequencers that bring on the electric heat. You need to take a voltage reading from the White wire and the Common to see if you have 24volts when the system is set to off at the tstat. If you have 24 volts that is a good thing, if you have no voltage that means the tstat is calling for aux heat. If you are not calling for heat, but the heat is coming on then the tstat is bad. If you have 24 volts across White and Common and the electric heat is on, you have a sequencer that is bad.
Does this make sense?
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| | FranklinRod
| "Re(4):Heat strip on when in fan only mode" , posted Fri 24 Oct 21:03
OK, here's what I got. 24vac between X and W2 any time the Aux. heat LED is on. This doesn't seem to jive with the statement "...if you have no voltage that means the Tstat is calling for Aux. Heat."
I need to know why there would ever be an auxilliary heat call when I'm in cool mode and just switch from auto to fan on mode.
Hit me!
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