New Thermostat Hookup Verification - Heat Pump/Heat Coil Auxiliary

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Old 11-30-11, 06:39 PM
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Smile New Thermostat Hookup Verification - Heat Pump/Heat Coil Auxiliary

Greetings!

After reading through the forums, I think I was able to install a new Honeywell RTHL3550 Non-programmable Thermostat. Nonetheless, I had a few simple inquiries and wanted to get a second set of eyes on my work.

I replaced an older, (double) mercury switch Honeywell which had the following hookups:

O - orange
W2 - (jumper to E)
E - White & (jumper to W2)
G - Green
R - Red
X - Light Blue
Y - Yellow


The Heat Pump is outside, with the blower in the attic. It uses resistance heating for emergency/auxiliary heat.

The new thermostat owners manual had a screw diagram with its default nomenclature and provided alternative nomenclature just in case it was labeled differently from the existing wires. I will provide the alternative nomenclature in parenthesis. Here is how I hooked it up to the new (So, Old - Color - New):

C (X) - Do Not Connect (taped up the light blue X)

L - Empty
E - White - E (jumper to Aux)
W2 - jumper - Aux (jumper to E)
G - Green - G
O - Orange - O/B
Not used - Not used
Y - Yellow - Y
R - Red - R (jumper to Rc)
Rc - jumper - Rc (jumper to R)

So, I think I did that right. I didn't have to deal with any of the cautions, which end in, " ...stop now and contact a qualified contractor ... "

Questions:

1. Is Auxiliary heat essentially the same as emergency heat?
2. If I see the auxiliary heat text pop up on the digital display, should I be concerned (above 35 degrees outside)?
3. Is it possible that this new thermostat would run my heat pump differently than the old thermostat, with respect to auxiliary coils?
4. Can I expect a huge cost savings running 68 degrees rather than 70 degrees?
5. Could I remove the batteries and power the new thermostat by using the light blue (X) wire from the previous setup - and if so, would to which new thermostat post.


Anyway, that is about it. Any input is greatly appreciated. I am really just concerned about my wiring, so feel free to comment on that and not my questions if it makes it easier to respond to this post.

Thanks.
 
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Old 12-06-11, 06:05 PM
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Well, it has been a week since I posted and while the post has been viewed a hundred times, there has not been an answer. I take that to mean that my supplemental questions were pretty stupid or they exist elsewhere on this forum. I was a bit lazy, I admit.

As far as my wiring hookup, it appears to be functioning correctly, so I believe I hooked it up correctly.

Anyway, thanks for looking at the post. Peace.
 
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