Mercury to Digital (Z-Wave) Wiring.


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Old 11-06-14, 07:56 PM
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Mercury to Digital (Z-Wave) Wiring.

Hi all. Any assistance would be appreciated!

I'm swapping out an old Rheem Mercury Thermostat controller for a 2GIG CT100 (z-wave) thermostat.

This is for a Heat Pump w/electric aux heat system.

The Rheem mercury t-stat had 7 wires connected:

W2
L
B
X
G
R
Y

The O and E connectors on the t-stat had nothing connected to them (there is a O wire, but it was not connected to anything.)

Here is a picture of the old thermostat connections:



I have currently hooked up the following connections to the CT100 (OLD/NEW):

G/G
Y/Y
R/RH (jumpered to RC)
B/B
X/C
W2/W2

That means that I am still not using the O wire. I'm pretty sure that's correct.

I'm also pretty sure that using the X for my "common" wire (which I need for z-wave) is correct.

But what I'm most worried about having done correctly is the W2 and L wires.

Should my old W2 wire be plugged into the new W instead of W2?

And what about the old L (black) wire? I don't know what to do with it.


Thanks for looking!
 
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Old 11-06-14, 08:22 PM
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Welcome to this forum.
It looks like the old W2 is now W according to your manual.

G/G
Y/Y
R/RH (jumpered to RC)
B/B
X/C
W2/W

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Old 11-06-14, 08:40 PM
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Thanks for the response.

I'll move the old W2 to the new W. It didn't seem right that I would have something in the new W2 but not the new W... but I wasn't sure if there was some legacy W2 spec that required that's where it be since that's all the old T-stat had.

What about that old L (black) wire? I'm not sure what it does or what I should do with it. Is it the manual Em Heat switch? Do I not need that with the new thermostat?
 
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Old 11-06-14, 09:14 PM
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L is for Light.
Some outdoor units will give you a trouble light.
Tape it off since your new stat doesn't support it.
 

Last edited by Houston204; 11-07-14 at 02:50 AM.
 

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