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I have an older Carrier Heat Pump which I am trying to update the thermostat control with a Hunter model 44550. The problem is that the wiring to the current thermostat is as follows, G= green wire, R= red wire, W2= blue wire, O= orange wire, Y= yellow wire, E= grey wire and C= white wire. If I am reading the schematic correct for the Hunter thermostate I am to wire as follows Green to G, Red to RC, Blue to W, Orange to O, Yellow to Y/Y1, C cap it as batteries are used. It does not tell me what to do with the grey wire. Also do I select single stage heat pump and do I leave the jumper wire betweem RC & RH? Thank you for your help. Contact me at 541-660-4856 or lorimecca@gmail.com. Lori Mecca

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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.

Posted on Oct 26, 2008

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How do I set my hunter thermostat so when the heat pump comes on, how to set so the thermostat and heat strips from the heat pump sinc with each other. The model number is 44860


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