My old thermo has 4 wires(Red,White,Yellow & Blue).Wish one isthe "C" wire for power ?
1323129
Do you know how the old thermostat was connected to the wires is very important to observe the terminal labels when removing an old thermostat because sometimes the existing wire color codes are not proper.
1323130
I am going to assume you have a heating and cooling system. That being said, you need to have five wires in your thermostat cable from the furnace unit to the thermostat. Refer to page 46 of the VENSTAR manual - the 5 wire, 1 stage cooling/heating diagram. The color coding is as follows: R(red)=24 volt power; W(white)=heat; Y(yellow)=cooling; G(green) =fan; and blue(for me)=common. This is where the trick is - you must have five wires so that the common can be connected between the furnace and the thermostat. The older systems did not need the "common" because they were not a powered devise. If you don't have five conductors in the thermostat cable then you will need to replace the cable. I am going to assume you have a heating and cooling system. That being said, you need to have five wires in your thermostat cable from the furnace unit to the thermostat. Refer to page 46 of the VENSTAR manual - the 5 wire, 1 stage cooling/heating diagram. The color coding is as follows: R(red)=24 volt power; W(white)=heat; Y(yellow)=cooling; G(green) =fan; and blue(for me)=common. This is where the trick is - you must have five wires so that the common can be connected between the furnace and the thermostat. The older systems did not need the "common" because they were not a... » Read More I am going to assume you have a heating and cooling system. That being said, you need to have five wires in your thermostat cable from the furnace unit to the thermostat. Refer to page 46 of the VENSTAR manual - the 5 wire, 1 stage cooling/heating diagram. The color coding is as follows: R(red)=24 volt power; W(white)=heat; Y(yellow)=cooling; G(green) =fan; and blue(for me)=common. This is where the trick is - you must have five wires so that the common can be connected between the furnace and the thermostat. The older systems did not need the "common" because they were not a powered devise. If you don't have five conductors in the thermostat cable then you will need to replace the cable. « Show Less
918901
You need 5 wires for this, but have options. First, I'd pull the thermostat and check the cable closely. There may be a 5th wire in the cable (not used on your old thermostat) that's been cut off or pushed back into the wall. If not, you can use the "Venstar Add-A-Wire 5 Wire to 4 Wire Adapter" to avoid having to replace the cable. You can download the manual to check color code and compatibility with your unit.
2173570
I installed 3 in our vacation home built in 1986 and have a 4th to install next time I am there. It is a 2 wire system and there are only 2 connections on the new thermostat (2 line in and 2 load out) works great.
1264513
This unit will accommodate 4 wires, Red(power) White (heat) Yellow(cool) Green (Fan). It will function with Just red & white(for heat) or red & yellow(for cooling)If by 2 wire you mean line voltage(120v or 240v) the emphatic answer is NO!!! It is a low voltage thermostat. (24v AC) Hope this answers your inquiry. Darrel
1290664
No, this thermostat requires constant power - you will need a 24V "common" wire connected to the thermostat's "C" terminal. You would either need to run additional wires from your furnace to this thermostat, or there is an adapter you may be able to install into your current setup, but I'm not sure if you can make it work with only two wires. Either way you will need to modify your current configuration to include the common wire. See Venstar ACC0410 Add-A-Wire for all 24VAC Thermostats
433467
It needs two wires for 24volts. Just installed one at my home. It's a great thermostat and the install is not difficult, just give yourself an afternoon to make it look nice. Make sure that the control unit can be mounted at least two feet from the thermostat.
1480056
I should still work! I am assuming without seen a diagram you will have one wire to the power source and the other two wires will go to your wire in and your wire out and you will probably have to piggy back that the fourth wire if the fourth wire is not a ground
136935
I really dont remember. I either used the plug in cord that came with it or purchased a longer one and installed that -- 3 wires. Mine is installed with a 2 foot electric 3 prong plug. I purchased the on/off switch which lets me adjust the temperature. Again, not a hard thing to do.
1781925
If you are using a J or K type thermocouple, they would go on 9 and 10. With the red wire going on the one labeled (-). Red is (-) on thermocouples and White or Yellow is (+). If you are using a platinum thermocouple it would go on 8 and 10.
647739
the C wite is essentially just a power source. If everything else works with just a battery and you don't have just the C wire, then this is what you need.
1665390
I don't believe so because this thermo is designed for single-stage. Here's a pdf of the wiring diagram for your review. http://www.emersonclimate.com/Documents/White-Rodgers/instruction_sheets/0037-6754.pdf
728796
It's been a while since I installed, but I think if you don't install the common wire you will have a battery operated thermostat. If you have the complete 24 volt circuit, (Common installed), batteries will be the backup, in case of AC power failure.
1438116
Hello, the type K thermo Couple is a specific design with a specific wire connection type. Please call our tech support team if you have any additional questions. Thank you
2180795
I believe there is for the 6 conductor port, not the 4 conductor port. Check the picture, second row down, second from the right to see if that is the firewire type you need.
1961642
Need the C wire for wifi. I had an electrician run a new thermostat wire so that I could do it. If you are the owner, you may be able to rerun it yourself. Mine went through the heat flashing and was compressed by a support post and my electrician had the tools to fish a new line.
1368889
it is a 3 wire and for heater/furnace only. you need to jump up to a 5 wire if you have air conditioning as well..... Google told me to tell you that.
101074
Depends on how many wires , your voltage and wattage. This thermostat uses a two wire setup. It seems like you might have 4 in which case it wouldn't work. Maybe check out the Honeywell site for more specific information and the manual on it.
2262506
I don't know, all i do know is I have a gas heater and air conditioner combo unit. the old thermostat was a four wire round mercury switch. this one does work great. i am not a expert but i would guess a thermostat is a thermostat, it checked the temp and then applies power to the unit as needed. I hope this helps. my power bill has gone down also.