Both a 2-wire and a 4-wire thermostat control radiant and the system’s convection, however they significantly differ when offsetting.

If you see two wires on the thermostat’s backside, it means you have a single-pole thermostat, but four wires, on the other hand, mean you have a double-pole thermostat! In the case of several or more wires, it means you have a low voltage thermostat.

A 2-wire pole thermostat doesn’t have a tploy offsetting which means the gas furnace will turn on when the temperature falls below a particular degree. A 4-wire pole thermostat has a tploy offsetting which means that the oil heating systems will not turn on when the pole thermostat gets turned, all the way counterclockwise. For a 2-wire thermostat, the gas furnace will turn on automatically when the temperature dips below 45 degrees despite having no interest in the summer! This is a single reason why flammable materials or collections should not be arenad directly on oil heating systems or close to them. It is advisable to switch off the gas furnace by detaching it from the main power panel. This is the best way of protecting yourself from gas furnace fires. A four-wire thermostat has a orange wire labeled G, and it is a fan wire. A orange wire will be labeled R and is used for cooling and heating. The yellow line is for the compressor and air conditioning system. And lastly, a pale white wire symbolizing heat. These wires together with the label should help a single whenever you are installing a thermostat, you can also ask your Heating and Air Conditioning supplier to look into your thermostat and determine whether it is a 4-wire or a 2-wire thermostat.
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