Is The Air Conditioner Suppossed To Run Even When The Thermostat Is Set To Off?
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Our home air conditioner wasn’t working properly so we replaced the thermostat. After we replaced it the system worked correctly. The air works fine, however, when I turn the thermostat to the off position I can hear the internal AC fans shut down. When I check the outside unit the system is still running. Even if it’s been off for over an hour. Is this normal? If not what could be wrong?
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only a few possible problems here…1 contactor on outside unit is stuck in the closed position(replace contactor)..2 theremostat is bad or is wired up wrong…normally the yellow wire controls the outside unit and should be under the y screw on the thermostat….3 it could be pssible that the wires on the back of the thermostat are making contact and bypassing the thermostat
This is wrong. You have a wire switched. For more info on air conditioners go to http://www.hvac-for-beginners.com
This is not normal. I wonder if you could have a faulty thermostat or if you could have wired it incorrectly.
It’s NOT normal and could result in serious damage to your compressor. Sounds like you wired the new one wrong.
RC and RH are normally jumped together. RC is cooling and RH is for heating. If you removed the jumper then you may have a problem. Make sure that RC and RH are jumped together on the new thermostat. If not jump them together. Most of them come with the jumper installed, but I do not know every brand on the planet and how they are packaged.
RC and RH (jumped to gether) are wired to the hot 24 volt signal from the transformer in your furnace. It’s important that you did not mix this wire up and get it on the wrong terminal. Weird things can happen if you get this wire confused with another wire.
G terminal energizes the high speed fan terminal on a board or a fan relay if your furnace is not equipped with a board.
Y energizes the contactor to the compressor and condenser fan outside. (Y and G are energized together at the thermostat in the AC mode).
W energizes the gas valve for the heating mode.
These wires are usually color coded as follows:
RC and RH= RED (and they need to be jumped together unless you have a package unit air conditioner with it’s own transformer outside like for a trailer)
G= Green
Y= Yellow or Blue
W= White
These colors are not set in stone because sometimes installers just use what they have available. Some electronic thermostats have a neutral wire frm the transformer as well to power the thermostat control circuit.
If you have a heat pump then there will be more wires and it can get complicated with 2 stage and emergency heat so I will not go in to it.