Lux LPB-WH-005 C-Wire Adapter with Y-Splitter

The original C-Wire adaptor was not working. This was easy to install. I did not need to use the Y adapter (that is in the thermostat).

Very simple to install, and it does the job. Wanted to upgrade from an old mercury thermostat to the Nest E. Had 4 wires running up from basement to 2nd floor, no common. Was able to use my G wire as common, but lost independent fan control. So this little guy saved me the cost of a contractor and/or the frustration of spending 4 hours trying to run a new wire, and the system works perfectly! Just make sure your HVAC system supports a C wire in the first place. Trying to use the Power Bridge on an old system without C terminal and failing is not Lux's fault, and I unfortunately see a lot of reviews to that effect.

The five wires were color coded and easy to install to the wires in the attic. The input wires going into the splitter were labeled 1,2,3,4 and there were no instructions telling which color wires from the thermostat should go into the numbers. I had to do numerous searches online to figure it out. If I remember right starting with number 1 it went yellow, white, red and green.

We have a HVAC system which has 4 wires and does not have a common wire and got a traditional thermostat which was operated on batteries. I wanted to upgrade to Nest thermostat and my HVAC system requires a common wire for Nest to work properly. After some research I came across this Lux Power Bridge in Amazon and wanted to try this before as this was cheaper than other adapters out in the market. It comes in 2 parts. 1. Power Bridge Adapter (This goes on your HVAC Control Board end) 2. Split Wire (This goes to your thermostat) I followed the instructions as provided in the installation guide and it worked like a charm. I am getting a constant voltage greater than 3.90 V to my nest thermostat and I am run the HVAC fan independtly without turning on the Compressor or Heat Furnace.

The instructions for this show you attaching an adapter so you have the 4 wires going into the extender and then 5 coming out? How is this supposed to help if you are missing a c wire? You will have to end up running that fifth wire it adds through your wall anyway! Either the instructions are wrong or this completely misses the point of what it is supposed to do.

It may be the way my unit is configured, but it would not work as intended.

Just wanted to second that this is just what is needed to add a common line for a Nest Thermostat. Half hour total time start to finish for install. Don’t suffer the common on and off symptoms of installing without a common wire.

This worked like a charm with my Sensi Touch WiFi thermostat. I was upgrading from 4 to 5 wires. The simple instructions made it easy to install and it works perfectly.