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Old 04-23-2012, 07:35 PM   #31
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wireless thermostat question


In the last picture you show the low voltage wiring. Check the back of the door you took off and it should show what the wire colors from the Air handler mean or what terminal they should go to on the stat.

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Old 04-23-2012, 08:05 PM   #32
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I can't believe I didn't look at the door better! I will go back up there tomorrow after work and look better. It's such a tight space I was trying to get out as fast as I could.

Here's the real model number for that air supplier unit. Not sure what the other one was but.

wireless thermostat question-image-4151327237.jpg
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Old 04-24-2012, 07:34 PM   #33
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wireless thermostat question


There's nothing on the back of that door. I took a bunch of pictures of the front though. I could barely read it.

wireless thermostat question-image-2138608823.jpg



wireless thermostat question-image-518241961.jpg



wireless thermostat question-image-2989717208.jpg



wireless thermostat question-image-1339812003.jpg



wireless thermostat question-image-3378012048.jpg
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Old 04-24-2012, 08:11 PM   #34
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ok. that helps. Now we need to know in this picture what color thermostat wires are connected to the wires from the air handler:

Purple
White/Black
White/Blue
Green/black
Brown
Red
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Old 04-24-2012, 08:26 PM   #35
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wireless thermostat question


I am going to guess Red to Yellow, Green to Green, Orange to Purple, Blue to Blue. Can't really figure the other colors, due to the OP having not a clear picture. And as for the schematics, they are hard to read, due to need to be rotated, and taken too far back.
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Old 04-24-2012, 08:33 PM   #36
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Originally Posted by hvactech126
ok. that helps. Now we need to know in this picture what color thermostat wires are connected to the wires from the air handler:

Purple
White/Black
White/Blue
Green/black
Brown
Red
You just want me to look to see what color wires are connected on that low voltage section? I was assuming all the colors were attached to the same color but I will check it out.
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Old 04-24-2012, 08:47 PM   #37
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wireless thermostat question


nikeman, you need to physically go to the Furnace which is the unit inside the house, and write down what colors from the wire that looks like telephone wire and put on a piece of paper which color connects to the heavier wire gauge wire on the furnace as I have somewhat figured out from the picture.

That means as I stated that the Red from the Thermostat is Yellow (ie Red small wire to Yellow big wire, and so on.). It is really hard to tell from the schematic in how you posted it, due to the fact that it needs to be rotated and too far back. There should be a section on the schematic that looks like the wires that go to the thermostat. Should be something like five wires. As for the unit outside, you can look at it and easily tell how it is wired to the low voltage.

At this point, it would be easier to just call a HVAC tech, as long as you have the thermostat you want, and have them wire it, but you need to let them know that the wiring may not be correct at the thermostat, so that they know they need to go to both the outside unit and the furnace in the attic to make sure what colors are where, even though the thermostat may be correct.

Plus side is, they can walk you through some steps in how to maintain that ancient beast.
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Old 04-24-2012, 09:15 PM   #38
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wireless thermostat question


I will check it out. It can't be more than 12 years old since that's how old the house is.
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Old 04-24-2012, 10:22 PM   #39
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Quote:
Originally Posted by nikeman View Post
You just want me to look to see what color wires are connected on that low voltage section? I was assuming all the colors were attached to the same color but I will check it out.
Yes, that is what I want you to do.

Greg, The colors I listed are what are on the schematic going to the thermostat from the AHU. You caught something though that I had not. You said Red to Yellow which you can clearly see in the pic. That then means that the transformer has been replaced and is not OEM. I'm glad you caught this as it would have confused me once the OP gets back with the color connections.
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Old 04-25-2012, 07:35 PM   #40
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wireless thermostat question


Here ya go. All kinds of pictures for you. I don't know if it's the lighting up there or my eyes going bad but I could hardly tell what the colors were on some of them. There were also thin yellow, white, red, and green wires attached to anything.

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wireless thermostat question-image-1086014830.jpg



wireless thermostat question-image-3382785959.jpg



wireless thermostat question-image-393783599.jpg



wireless thermostat question-image-1622308123.jpg

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Old 04-25-2012, 07:45 PM   #41
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Which stat are you wanting to wire up? Pretty much any will work.

Current stat - meaning

R - 24V hot
X - 24V common
Y - Cooling
W2 & E - Aux heat (both stages)
G - Fan
B - Reversing valve (powered in heating)

you would be better off with the prestige 2.0 simply because you could have more staging control. This would require you to also get a internet gateway.
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Old 04-25-2012, 08:10 PM   #42
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I just want a decent one that will allow me to control the temp from my iPhone for free. I work crazy hours so every week is different and therefore programming weekly is not going to work. I'd like to stay in the $100 price range also.
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Old 04-25-2012, 08:19 PM   #43
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The 3m would be what you want then. You wont find much else in that price range.
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Old 04-25-2012, 08:34 PM   #44
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The 3m would be what you want then. You wont find much else in that price range.
If I bought that 3m50 can you tell me where to put each wire from the old stat on to the new one? I want to have it all ready when I do get it so it can be a smooth install.
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Old 04-25-2012, 08:48 PM   #45
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OLD = NEW

R = RC AND RH
X = C
B = B
G = G
W2 = W2
Y = Y

You will have to setup the new stat for HP w/ aux heat.

The reason for having you do all the checking was to verify how your system was wired so that you wire it correctly on a new stat. The old stat did not use common wire colors on specific terminals which was a bit confusing.

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