The old mercury thermostat doesn't have any markings and only had two connections for each of the wires: a yellow (or white) one and black one. The new thermostat has a FAN ON - AUTO switch and a HEAT OFF COOL switch. The markings for the terminals on the new thermostat are R, W; Y, and G. The system is an old oil burner, and it's (as near as I can tell) 24volts.
2007-03-18 13:47:47 · 5 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
r and w. black to the R and white to the W
2007-03-18 13:55:22 · answer #1 · answered by hometech02 3 · 2⤊ 0⤋
You only need to use the r and w screws on the new thermostat....dont mater which wire you put where since you only have two wires....be sure and level the thermostat as this is very important for accurate temperature..also you wil need to set the thermostat to heat and turn the fan switch to auto..their is another item called an anticipator on your thermostat and this needs to be set at the same setting the old thermostat was...should be a small pointer inside the thermostat where the coil or spring is ....be sure to read the paper work that comes with thermostat it will show you where the anticipator is and how to set it...
2007-03-21 20:54:34 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The black goes to R and the white wire to the W and keep it on auto and heat
2007-03-18 14:28:01 · answer #3 · answered by brndnh721 3 · 1⤊ 0⤋
last answer is right if you only have two wires on old stat than hook them to the r and w. the y is for cooling and the g is for the fan switch
2007-03-18 14:30:43 · answer #4 · answered by roster 2 · 0⤊ 0⤋
Time to call an electrician - one of the few things I don't DIY!
2007-03-18 13:52:05 · answer #5 · answered by Caroline H 5 · 0⤊ 1⤋