Lost A/C efficiency and check condensor and noticed the HP pipe was frozen up. Tried a lower temp and high fan speed, tried reverse cycle and the condensor fan was working. I do have a car A/C background and when this happened it was usually a TX valve. Any suggestions??
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Re: Teco split system freezing up.
I am assuming this unit to be running in A/C mode, not heat pump.
Evaporator freeze-up is up on units such as this is 99% of the time caused by reduced airflow across the evaporator. This could be due to dirty filters, dirt plugged evaporator, fan motor not running full RPM.
Systems like this tend not to use TX valves either, and a TX valve failure will rarely cause the evaporator to freeze up. If it fails open, then there has to sufficient refrigerant flow and pressure differential to flood the evaporator with low temperature refrigerant, in order to cause a freeze-up. If it fails closed, no cooling occurs, suction pressure goes to vacuum, and discharge pressure goes to the pressure of the refrigerant at the surrounding ambient temperature.
(I used to teach HVAC at a Jr college, as well as having designed equipment like this.)
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By pressing on/off switch on .And then press mode button FAN,DRY,COOL,HEAT & AUTO as you required. Cool position keeps 22 degrewe by clicking Heat position keeps +29 by clicking Auto will be 24 degree and you can't change temp and also fan speed. By clicking Fan you can choose LOW,MED,HIGH. Hope this will be helpful?
There ae several causes for the symptom you describe.
Unit off 5 hours and now seems to be making it's own ice. (Hail reference)
This is usually caused by a restriction in the coolant system. Most often the restriction occurs at the evaporator manifold. Once debris (internal corrosion in coolant system or any particulate) is in the coolant system is blocks 1 or 2 of the 3 manifold distribution holes of the evaporator. When that happens one or 2 sections of the evaporator start freezing up. As it freezes up the temp sensor notices the vast temp change and shuts off the compressor. (Fan still running) The ice then melts from fan air and then gets injested into the blower fan. Hence you get the hail sound.
As for the drain problem An Air-Conditioner that is used 19 - 24 hours everyday should have a 90 day total cleaning cycle. This involves removing the fan assy and using a power washer on the condensor, evaporator and both fan blades. If you look in the drain pan drain area it will will have a mucous looking goo in the drain pan. Once the drain hole is clogged the condensor gets dirty and the unit efficiency degrades.
I doubt there is anything that you as the homeowner can do to stop the icing. The coolant system will most likely have to be purged to get rid of the internal foreign debris and the coolant levels serviced. You can have it cleaned but even after cleaning it is highly probable that your symtom is going to repeat.
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! :-)
SOUNDS LIKE THE FAN SPEED MAY BE TO LOW SO AS THE AIR GOES THROUGH THE COIL IT WILL START TO FREEZE HAVE SOMEONE CHECK THE FAN SPEED MAKE SURE IT IS ON HIGH ALSO MAKE SURE IF THAT IS THE ONLY FILTER ON THE SYSTEM
I work on and like the sanyos.Yes there is usually a crankcase heater and fan cycling controls.As far as efficiencies.....thats up to what you wanna spend upfront or on electricity later on.Im in Ohio.