Tempstar heat pump: want to bypass defrost thermostat
Our heat pump is wanting to go into defrost mode constantly when we have it turned to heat. It attempts to go into defrost, but it sounds as if it keeps tripping a switch on and off and it repeatedly gets louder. So we end up using the emergency setting when this occurs.
We live in Clearwater, FL and I don't think we really need the defrost cycle. Can I bypass it? It's a Tempstar heat pump that was installed when the house was built in ''91''. It has served us well with no problems.
Re: tempstar heat pump: want to bypass defrost thermostat
Sound to me that you might have more of a defrost sensor problem or micro board in the condenser (outside unit).. and no you should not bypass what its design for, it can hurt your unit... and at 18yrs old unit.. thats a good one...good luck..mike
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4HP13/14 SPLIT SYSTEM HEAT PUMP .... indoor unit, outdoor unit contains system refrigerant charge for operation ... may be installed with up to 50 feet of line set (no more than ..... The defrost control incorporates 2 pressure switch .... Note: Sensor resistance decreases as sensed temperature increases. Pins/Wire. Color.Missing: tempstar
This Manual Supports Split Heat Pump Units of The Above Series .... two groups is based on a difference in Defrost controls and/or the .... completes a circuit between µRµ ? µOµ in the the thermostat sub-base. 2. .... before connecting line voltage. ...Wire "S1" is the first stage of electric heat through the outdoor thermostat.
Heat pump and AC are basically working the same principle. When you turn on the heat pump is just like to turn on the AC. The main contactor will energize to turn on the compressor. The only difference is the 3 way valve, either switching to AC mode or heat mode. It is the most commom problem for heat pump. Check the thermostat wires for heat mode and defrost control.
You post is not clear as to where the freeze-up is occurring. I'm going to assume the outdoor unit is frozen up.
Heat Pumps don't generally freeze up at 60 degrees. If the ice around the unit has an uneven pattern (for example a thick spot around the center or at the very bottom) could indicate a low refrigerant charge. If the ice is even throughout, it may be one of the following:
*Sticking Contactor*.....turn the system off at your thermostat and check to make sure the unit outside shut off. If it doesn't turn off, it is likely to be the contactor.
*Failed Defrost Thermostat*.....if the defrost thermostat fails "open", the system will never go into defrost.
*Failed Defrost Control Board*......this could also prevent the system from going into defrost
*Failed Reversing Valve*........put your system in COOL mode and check to see if it will blow cold air inside approx 16 - 22 degF lower than room temperature.
*Failed/Failing Condensor Fan Motor*.......ensure the condenser fan motor is running during heat and cool modes. The condensor fan motor will not run in OFF/Satisfied Mode or in Defrost Mode.
I hope this helps. Good Luck! :-)
I believe the unit you are describing is a heat pump. Heat pump are great when the temperature isn't below 30 With low ambient temps. outside it is much more efficient and comfortable to run aux. electric heat from the heat pump.
It would help if I knew what type of system you have, lets start with the thermostat. If you disconnect the wires to it, does the heat turn off? I have seen thermostat wires pinched inside the wall, thus bypassing the thermostat controls altogether and it would run constantly. If you send a reply, tell the type. Wall furnace, central unit, heat & cool, gas, electric or heat pump. If you dont know tell me how many wires you have at the thermostat and the colors. You should know this, as you have changed it.
FIRST YOUR OUTSIDE UNIT PROVIDES HEAT BY USING A REVERSING VALVE TO CHANGE THE REFRIGERANT FLOW.THERE IS NO HEAT STRIPS OUTSIDE SECOND YOUR EMERGENCY HEAT TURNS ON ELECTRIC ELEMENTS INSIDE YOUR AIRHANDLER UNIT.IT SOUNDS LIKE SOMEONE HAS WIRED YOUR UNIT WRONG OR HAS THE THERMOSTAT SET IMPROPERLY.WHEN THE HEAT PUMP CANNOT SATTISFY THE SETPOINT THE THERMOSTAT IS SUPPOSED TO TURN ON YOUR ELEC. HEAT UNTILL THE LOAD HAS BEEN REACHED AND THE HEAT PUMP CAN CONTINUE TO MAINTAIN IT.
I just had a new unit installed and I am surfing for troubleshooting tips too. My unit is doing the same... cools well heat sucks. my problem has been isolated down to the reversing valve... It is constantly energised which means it is constantly in a/c mode even when kicking on the heat strips... We disconnected a line at the thermostat and it is working well as a heater now. You may want to check yours to see if it is actually kicking over into to heat mode... -rob