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COMMON WIRE ON CARRIER MODEL FX4BNF030000AAA

FOR WIFI THERMOSTAT INSTALLATION .

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: Carrier Thermostat Model TSTATCCPB501 ER code

I gave up and called a local HVAC business. This thermostat is discontinued and a new one will be purchased and installed.

Posted on Dec 16, 2008

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C is common for 24 volts from the a/c transformer secondary or low side. R and C are 24 volts and will power up loads of 24 volts such as thermostats requiring to be powered up,
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Installed a new Filtrete thermostat on a new Carrier high-efficiency furnace. I followed instructions exactly. It doesn't work. What did I do wrong? Furnace was installed in December. Broom handle...


Hi smargyle,

Welcome to fixya!

I can provide you with diagrams for the old Carrier therm and for the new Filtrete therm. But, I would need to know what the model numbers are for each therm plus how many speeds AC you have.

Please reply back with that information and we will get your AC back in working order.

Thanks,

Handie Andie

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Replace thermostat


Typical color codes in Florida are;
white to W1 for heat
yellow to Y for compressor
red to R-RC-RH for power in
brown to W2 and or emergency /auxillary heat
green to G or Fan
orange to reversing valve(o/b)
blue to common.
You can open the control panel on the unit to verify these colors and components.

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1 Answer

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JUMPER STAYS BETWEEN RC AND RH SO YOU HAVE INCOMING POWER FOR BOTH COOLING AND HEATING. THE WHITE WIRE YOU SAID C IS COMMON AND SHOULD BE USED IF POSSIBLE TO COMMON TERMINAL ON NEW STAT . IF THERE IS NO COMMON, THEN CAP IT BUT YOU'LL BE CHANGING BATTERIES EVERY FEW YEARS. I LIKE THE STATS WITH A COMMON POWERED OFF THE TRANSFORMER BUT YOURS MAY NOT HAVE A COMMON. THE GREY WIRE CONNECTED TO THE E TERMINAL IS FOR EMERGENCY HEAT. IT KILLS POWER TO THE HEAT PUMP, HEATS THE HOUSE ON IMMEDIATE CALL FOR HEAT WITH JUST THE INDOOR BLOWER AND THE INDOOR HEAT STRIPS. THIS PREVENTS ANY DAMAGE OR INCREASED DAMAGE TO THE COMPRESSOR IF YOU SUSPECT A PROBLEM.YOU SHOULD HAVE A TERMINAL ON THE NEW STAT THAT IS MARKED E OR PERHAPS X2 OR W3. THAT IS WHERE THE GEY WIRE GOES. IT IS POSSIBLE THE WIRE CONNECTED TO W DOES THE SAME THING AND YOU CAN GET BY WITHOUT THE GREY WIRE CONNECTED.ALSO SELECT SINGLE STAGE HEAT PUMP. SINGLE STAGE COOLING AND TWO STAGE HEAT . FIRST STAGE HEAT IS YOUR HEAT PUMP AND SECOND STAGE IS YOU STRIPS.

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