I am thinking this is the thermostat wire. Always set the temperature of your air conditioner below from the temperature of the room. I took the electrical shutoff box apart to see how it was wired and see if I can Replace it. Read the manufacturer's instructions. Hi, my ac recently stopped working, so I went outside to check it out and found a 3 wire set loose, I think my dogs might have tripped over it and pulled it out but I am not sure where it connects to. That thermostat wire amp capacity I cited was for copper wire, soft-annealed, nick-free. Your thermostat is the control center for your HVAC system. The two 24 volt wires go to the R terminal and C terminal inside the thermostat. Connect the white wire to the connector labeled W. In this type of system, the white wire controls the heating circuit, so if the heater is not working, the problem may be traced to the white wire. Clip the red lead to the power wire and the black lead to the negative wire. I need to know where to re connect it to. I cut my red and white wire on my outside central air unit. They are tied into the thermostat lines. To keep the transition to a newer thermostat to minimum hassle, just choose a new model that abides by roughly the same size and shape as the old one. Power from an AC thermostat travels into the unit, and this signals to the air conditioner that it should start working. Is this a problem with the unit, or the thermostat inside the house? Now it will not power up. If they only go to the furnace, pulling a new cable shouldn't be too bad as they are only about 10 to 15 feet apart. The “18” refers to the gauge and the “5” refers to how many individual wires are inside the cable. Cerrowire 250 ft. 18/5 Brown Solid Thermostat Wire (27) Model# 210-1005G3 $ 69 79. I installed the thermostat originally with the PEK (eveything worked minus the outside unit running, by the way we have a furnace) because I didn't think I had a C wire, but after pulling some of the wires behind the thermostat I think I have one (it's blue). I have a red white yellow green and blue wire. Attach the wire from the thermostat being fed by Damper 1 to the terminals marked Thermostat 1. At the furnace, the unused wires are not connected to anything--shown here at the bottom. Please view my attached schematic for more detail. To investigate further, you step outside to see whether your outdoor AC unit is operating at all. Rc wires are only for air conditioning systems or dual transformer systems. This is a BIG ONE! There is a most common reason for outside ac unit not turning on. Joseph Colombo says: February 22, 2015 at 5:38 am I purchased a lyric thermostat and followed the instructions to install. Whenever you unscrew the air conditioning thermostats from the wall, make sure the thermostat wire doesn’t slip back to the drywall. On 2018-02-12 - by (mod) - Nick Amps ratings of typical heating & cooling thermostats: Typical residential room thermostats run at 24VAC. The fan isn't spinning. How to Wire Two Thermostats to One HVAC Unit By Daniel Holloway Things You'll Need. I have tried a great many wiring combo's but none seem to work well. If you have heat and AC, you’ll need 18/5. When replacing a three-wire thermostat, connect this wire to the R connector. Before wiring a new thermostat into your wall, review all tips, suggestions and pictures provided in the instructions. If there is no power to the thermostat then you will need to call a professional electrician to run a new wire from the HVAC unit to the thermostat. If the outside unit truly uses a C-wire, it does so for some low voltage electronics or on board controller. The two wires are red and white running from the house. If we have a 30°C temperature sets in our air conditioner display and, our room’s temperature is below 30°C, then our outer unit will not be operational. I cant seem to see any old red and white wires in there at all. Running new thermostat wire can challenging even for professionals. Using a multitester, switch the tester to a range that will measure 24 volts AC. Once you clean the system, put back the float switch and your AC starts to work as usual. Name: goodman ac unit wiring diagram – Wiring Diagram for Goodman Ac Unit New Wiring A Ac thermostat Diagram New Goodman Air Handler; File Type: JPG; Source: rccarsusa.com; Size: 1,014.77 KB; Dimension: 2136 x 1584; Collection of goodman ac unit wiring diagram.