Please Help New Tstat Wiring


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Old 01-13-18, 09:50 AM
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Please Help New Tstat Wiring

Hi,
I am trying to install a Honeywell TH5220D 1029 Tstat for a Trane XE1000 heat Pump w/ aux heat.
It originally had a mechanical Trane Tstat with:
C, T, B, O, W, Y, R, G.
I replaced it with a Ritetemp that went:
C= Disconnected
T= Disconnected
B to C (I believe B is Common on older Trane's)
O to O
W to W2
Y to Y
R to RH
G to G
The available terminals on the Honeywell are:
Conventional Y2, W2, G, W, C, Y, R, Rc.
Heat Pump: L, Aux/E, G, O, B, C, Y R, Rc.
I assume I use the heat pump terminals, Correct?
I'm thinking the wiring should go as follows on the Heat Pump terminals:
C = Disconnected
T = Disconnected
B = C
O = O
W = Aux/E
Y = Y
R = R
G = G
Should the C and T go somewhere? I think the T was for an outside sensor for the aux heat.
I have no L wire. I think that's for a trouble indicator.

Thank you very much.
 
  #2  
Old 01-13-18, 10:11 AM
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C = Disconnected
T = Disconnected
B = C
You have B = C. Then you're asking about C.
You should have one or the other....... B or C.

You will need the jumper between R and Rc.
 
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Old 01-14-18, 08:52 AM
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Just to make sure, the W goes to Aux/E, correct?
I was wondering what the C wire would have been for on the old Trane mercury Tstat because B is common.
As I understand it, The T wire was for an outside Thermistor.

Thanks
 
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Old 01-14-18, 09:06 AM
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Yes..... correct on the W.

You'd have to open up the side of the air handler where the thermostat wiring connects and visually see what you think is a C is connected to.
 
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Old 01-14-18, 09:24 AM
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Thanks,
I'm gonna hook it up.
 
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Old 01-14-18, 04:18 PM
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Everything seems to be working ok,
Some set up steps weren't available though. I guess setting 1 dictates the steps. Here's what I did.
1. System type= 2 heat 1 cool heat pump w/ aux heat.
2. Changeover valve= energized in cooling.
3. Fan Control (heating) = Not Available. Skipped over.
5. Stage 1 heat cycle CPH= Not Available. Skipped over.
6. Stage 2 heat cycle rate/ Aux heat cycle rate (CPH) = 3
7. Aux heat rate cycle (CPH) for 3H 2C heat pumps only= Not Available =skipped over.
9. Stage 1 Compressor cycle rate (CPH) = 3
10, Stage 2 compressor cycle rate (CPH) = Not Available = skipped over
12. Manual/auto changeover= Manual
14. Temp Sisplay= F
15. Compressor protection= 5 min
26. Aux heat control= economy.

I bumped it up and the aux heat came on, so everything seems to be working.
I hope these settings are OK. The system is not staying off for more than 5 to 7 minutes though.
I'm wondering if changing the CPH to 2 would help it not run so often.

I hope this tstat has an algorithm for the aux heat. The reason I replaced the old one was because it didn't. It would struggle in real cold temps without the aux heat coming on. It would only come on when the temp fell below 3 degrees of the set temp. I would manually have to bump it up to engage the aux heat when it struggled in real cold temps.

Thanks
 
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Old 01-14-18, 05:19 PM
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On that stat there is no E/aux terminal. There is AUX and there is E. You can put a jumper between them so that you can use E heat only if needed. AUX runs the compressor and the electric. E runs the electric only.

If you want more even heat..... the AUX to come on sooner.... select the comfort setting.

Auxiliary heat control
Systems with heat pumps can be set to operate in one of two ways:
Comfort Setting: The thermostat will prioritize comfort over economy
depending on heat pump performance, load conditions and whether the
equipment is calling for heat. Raising the temperature just a few degrees
will often activate auxiliary heat.
Economy Setting: The thermostat will attempt to reach the temperature setting
without activating auxiliary heat. The thermostat waits a preset time
before allowing auxiliary heat to be activated depending on the compressor
stage performance, and on how many degrees the temperature setpoint is
changed.
 
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Old 01-14-18, 05:52 PM
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I have the Honeywell FocusPRO TH5220D1029 which has one terminal marked Aux/E that I put the W wire on.
I'm thinking about changing the compressor CPH to 2. I guess you can have a higher CPH for the Aux heat to where it would come on quicker along with the comfort setting. I hope a lower Compressor CPH setting along with a higher Aux heat CPH setting won't make the Aux heat come on by it self (EM Heat).
Thanks
 
 

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