Details
Install a Smart Thermostat Without a C-Wire. The C-Wire provides a path for continuous power to Wi-Fi thermostats, but often homes are missing this common wire. The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have this wire.
For Use With Honeywell Home WiFi Thermostats, RedLINK 8000 series thermostats
The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have a common wire..Product Type :Electronic Component. | Package Dimensions :10.0 ” L X10.0 ” W X10.0 ” H.Country Of Origin :United States
Quickly and easily power connected thermostats that require a c-wire.
Use for Wi-Fi, 24v Honeywell Home thermostats when a common wire is needed but not present.
Easy push terminals and an adhesive mount make installation quick and easy.
Simple adhesive mount allows you to attach the adapter to the outside of your furnace.
Product Type: Electronic Component. | Package Dimensions: 10.0 ” L X10.0 ” W X10.0 ” H.
Country Of Origin: United States
For Use With Honeywell Home WiFi Thermostats, RedLINK 8000 series thermostats
Prime member 🎼 –
Nice product even though I didn’t need it
I bought this thinking I would need it. When my HVAC tech came to the house to install my thermostat he said I didn’t need the C wire adapter lol
Brad Braswell –
Works as intended for a heat pump system
TL,DR: Using this with an Amazon Smart Thermostat and works fine.Though I did have a small moment of panic initially after installing everything and setting up the thermostat itself. As I was admiring my work and watching the thermostat come to life and wake up in its new home, it began “clicking on” and then immediately going blank for several seconds. At first I was thinking this may be part of the set up… until it didn’t click on again and was unresponsive in every way. At this point I just knew for sure I fried something, was going to have to call a technician out, and they were going to tell me I’d have to replace my entire system for thousands of dollars. I grabbed my multimeter and verified I had power coming to the furnace and then checked the small 3 amp fuse at the control board which was blown. I switched that out with one I luckily had on hand and everything came back to life as I threw the breaker back on. That was yesterday afternoon and everything has been working fine ever since.Further things I learned during this process:- What each wire does on a heat pump system (hence the pic with them identified).- This adapter combines the fan and condenser wires to free up a wire to be used as the C-wire- The C-wire is effectively the return for the 24v to the thermostat to complete the circuit (think chassis ground on a car or neutral on a home circuit).- If you have an unused wire on your thermostat cable, you don’t need this. Just hook that unused wire to the C-wire in your furnace (look for the blue wire coming from your outside unit and verify where it goes to the control board in the furnace) because even if you get this, you still gotta find a C wire to connect it to.
Rez –
huge lifesaver
we didn’t have the C wire upstairs, but this enabled it, AND WORKS WONDERFULLY!
Kindle Customer –
C adapter for thermostat.
works great
E. Sprak –
This does not appear to solve the typical “only have 2 wires” issue.
I ordered this product because my old thermostat only had 2 wires going to it, the red and the white wire, and the instructions do not address this all-too-typical issue. This is super common in older homes with forced air furnaces. The original thermostats were usually a simple mercury switch that connect the two wires together when the temp falls below the set point.I was skeptical on how a device could magically create a common wire (C wire) when all I had was the Red power wire and the white Load wire. As far as I can tell, it can’t. The GE Furnace (circa 1954) did not have a “control panel” with conveniently labeled terminal like what is show in the installation docs. I had to grab my Voltmeter and determine where the Common was on the 24 transformer and then I was able to run a wire back to the thermostat as a legit C-Wire. If you are lucky enough to have more than 2 conductors in the cable that goes to your thermostat, don’t buy this thing. Use one of the spare wires as a common, and connect it as such at the Furnace end and the Thermostat.Aside from that, I couldn’t figure out a way to mount it and connect it to the thermostat without it looking like a horrible kludge-job next to the New Smart Thermostat – so I’m glad it didn’t work.
TM1NE –
Great alternative to running new wire!
This converter was easy to install and came with easy to follow instructions. No issues getting the Honeywell Wifi thermostat connected to our hvac system. Our home was built in the 70s and naturally lacked the 5th wire to connect a 24v line to the thermostat. I was skeptical when buying this as it seemed too good to be true to get that power wire this easily. No issues!Something I ran into during install that wasn’t really covered in the wiring instructions: My furnace is an HE model, the yellow wire was split off the main circuit board on the furnace and it was ran to a float safety switch, then off to the thermostat from that switch. Make sure you wire in this box after the switch not directly off the circuit board. This float prevents the unit from running if it is full of water and not draining.
Chris –
Turns out I didn’t need it.
I’m sure it works well but under further review I decided to just replace the old wire with a new 18/5 wire to pick up the “C” wire. Therefore I returned it.
Doug –
Works great on my honeywell thermostat
Worked great to add the extra wire so I could run the fan, works great on my Honeywell Thermostat