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Trying to install a CT410A thermostat, have 2 red wires, 2 black wires coming out of the wall...how do i know which ones go with the 2 red and the 2 black on the thermostat
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Here at home where I reside we have an old school thermostat that has the mercury bulb that acts like a sensor, and in other cases it could just be as easy as replacing the batteries in the unit itself, usually a lid that hides them, sometimes it works
1 power wire (120v) will go to the thermostat and 1 power wire (120v) will go directly to the unit. The other wire on the unit will go to the other side of the thermostat. The safety precaution behind using a singlepole to replace a double pole contactor is that you will always have 1 leg of power going to the unit. Many systems are designed like this from the factory, but it is always better to have a 2 pole to cut all power off to the unit unless it's in operation. The unit will still not work as long as it does not have both legs of power. L1 to Thermostat T1 to Unit L2 and T2 wired together.
This is only for 240v systems. 120v Will have 1 common and 1 power, therefore you will need to know which wire is which. Power to thermostat, common wired direct.
Hello -- With what little you've said,. I think I can decipher that you are looking at an electric wall base heater??
If so, I did one of these a while ago and believe that there is no polarity on the thermostats.
ZTo be certain, you can Google the model number of the part for a service install instruction, this would certainly clarify it for sure. If you run into trouble with this you can also try searching out the model number of the heater itself for install instruction.
If you are installing these in tandem, there will be a different wiring diagram.
baseboard heaters are usually line voltage thermostats. the wire in your box sounds like a 240 volt circuit. either the 2 blacks or the 2 reds and wire nut the others. I dont know if they need to be connected to each other, not sure where they go or what they are to
Hi, this is very easy for you to do.The 12/2 Romex wire coming in is the power which you know. What you do need to know, is the voltage coming in? Sometimes they will use 12/2 Romex with ground for 220, 240, operation. You need to know if the T-stat is Line voltage 220, or 240 volt. You have to have the same voltage for both for it to control. Reguardless of the voltage, lets say it is in the 220 and up range. You take one of the 12/2 wires, white or black and hook it to the black or red on the T-stat and the white to the other one, red or black. Thats it, you are done! If the T-stat is 2-pole I am sure it is a high, Line votage T-stat. Best of Luck, Shastalaker7
I'm not familiar with the model number but if you are installing a standard line voltage thermostat it doesn't matter which of the black wires goes to the load.
do you have an a/c. you need to go to the furnace and find ware the t-stat connection is the connections will be R= power, w = Heat, G = fan, Y = cool, C or X = common, you will connect the same wires that connect to the furnace to the connections R G Y W C on your tstat. for the 2 black and 2 red i would turn off the power to the furnace twist one black and one red together then take a continuity test between the reds and blacks that will tell you witch ic witch.
From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.
Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.
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