Question about Samsung AW1203B Air Conditioner

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Teco split system freezing up.

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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When you reversed it the fan stop because it went into defrost mode,Change the filter,clean the coil,let it thaw,and if it happens again,it may have a clogged cap tube or a leak in the system.

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Posted on Jan 20, 2009

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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.)

Posted on Jan 20, 2009

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