Thermostat Wiring Diagrams for Heat Pumps - Heat Pump Thermostat Wire Diagrams C Terminal is connected to the Blue wire many times referred to as the C Wire - this is normally used for common and completes the circuit between R and C with the thermostat being the load for a basic circuit.W Terminal is connected to the W Wire or White Wire - This is for the heating circuit and control heat.Y Terminal is connected to the Y Wire or Yellow Wire - the yellow wire is for cooling and originates at the thermostat, runs to the air handling unit, and then to the condensing unit outside.G Terminal is connected to the Green Wire or G Wire - This is for the blower fan in the air handler.Origin is the control transformer and then the R Terminal. R Terminal is Connected to the Red Wire or R Wire - this is 24-volt power for the thermostat and controlled devices.
#24 volt transformer wiring diagram code#
Lastly, whenever in doubt call a professional.Īir Conditioner Thermostat Wiring Details and Color Code Or to at least be aware that the system has dual transformers. The heating system could also be a boiler, however, is it necessary to ensure with split systems and the type of heating systems described that you do not have dual transformers in the system. Finally, the third thermostat diagram showing the average type of split system with an air conditioner or gas or oil furnace used for heating. The second wiring diagram showing a heat pump system. With the top thermostat wiring diagram showing an air conditioning system. An air conditioner cooling system is different than a heat pump heating and cooling system. Lastly, these thermostat wiring diagrams will help you wire a new thermostat. Either of these can be a regular digital thermostat or a programmable thermostat.
The charts listed here will help you with a heat pump thermostat and an air conditioner thermostat. Additionally, before you decide to change your thermostat, make sure you have the correct tools especially a screwdriver and wire pliers. Thermostat Wiring Diagrams - Heat pumps are wired for HVAC control far differently than air conditioning systems so make sure you know the difference and correctly identify the type of HVAC system you have installed. I will need to ohms test new transformer disconnected too. I will do some ohms tests on several wires also. Ĭan a cut 24 volt wire to stat, maybe by rodent or weedeater cause the same issue ? Ill test it an see if reset got tripped an check wiring on the glass fuse.Im gonna ohms test old transformer off it too. those capacitors were OLD.again nothing changed as far as function. I changed out inexpensive capacitors an same contactor last week ,after it started. The contactor replaced 8 mo ago due to old age an worn contacts. I use a permanent gas heat i have in winter a lot too. Good cold air if contactor is engaged manually. I put in a goodman last year at my other place. Im gonna put another unit in myself later but want to get this 24 volt issue fixed. A bit more in the summer yea but not bad. Yep back then they didnt have a fancy reset switch on transformers. It did for my son when an old unit was replaced. A new SEER 16 unit may knock off $150-$200 a month off the electric bill in the summer months. After this weekend heat we’re going to have it may convince you that it is time to retire the unit.
It must be a R22 refrigerant that will no longer be available unless there is old inventory around and prices are through the roof.
The contactor is new so had there been other problems? This beast being over thirty years old is or less than SEER 10 and it must be costing a fortune to run it. Something other than infinity or zero should be read. If still no output, with power off and the blue/yellow disconnected, read the ohms across them. No connection it could read up to 29v, under load as low as 18v.
How old is the compressor? They don’t last 30 years.ĭid you measure the 24v connected or disconnected? Should read it both ways. Are you sure it only thirty years old? I think it is older. This type of fuse on the low voltage side. Possibly you can eliminate this fuse since the transformer has a built in breaker. From the picture there is rust stains inside of it and it reads “dual element”. Since the new transformer has a breaker, check the glass fuse and holder with an ohm meter. This breaker/reset button looks like it is on the 24v output side because of the amp rating and near the blue yellow output leads. For the input side only two wires are ever used.
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