3 Yrs Old American Standard Central Air Unit
My central air conditioner runs for about 2 weeks, then it freezes up on the outside unit & central air units start warming up.
I turn off the ac cool & just run the fan until the outside until defrost. Then I turn the ac back on & it cools for another 2 weeks then I go through the same problem.
When the central air conditioning is put back on my thermometer that sits in one of the vents read about 52 degrees. The repair man came 2 weeks ago & couldn't find anything wrong. He checked the Ac Freon level, it was ok, checked the capacitor , ok, checked the mother board no problems, he told me to call him when it froze up again which was today 8/30/2011.
This central air conditioning units
is only 3 years old. I had everything replaced including furnace, condenser
Sowder @ airconceptsllc.com replies:
Remember there are several reasons why units can freeze up and again it may be right in front of them or something the installer caused. “New installs” When the installer brazed or sweat the air handler’s copper lines in to the unit, did they protect the metering device/ TXV from the heat? This device meters controls the flow of refrigerant through the evaporator coil located inside the air handler.
Connected on this metering device is a sensing bulb located on and secured to the suction line again inside the unit. If this is not tightly secured or in the right position the metering device will restrict the flow of refrigerant and cause freezing. If the sensing bulb was not removed from the line while they were brazing, they could have caused the metering devices to lose its refrigerant self-contained charge in the sensing bulb, causing failure to the metering device and having intermitted problems.
Did they check there wiring, low voltage or high voltage connections to the central air conditioner
and thermostat? Air flow is the most important
thing to know, if the blower motor is shutting down due to incorrect wiring or capacitor discharge or motor failure the unit will freeze up.
Make sure they installed the correct thermostat for that application, installer’s guide and programming would need to be set up if it is a heat pump it should be for heat pump and straight air etc. Make sure there are no nicks breaks or damage to the low voltage wiring when they installed the equipment.
They should have rechecked all of the wires for damage when they completed the install in and out. If the set up and programming was not done correctly there can be issues with the unit freezing up check to see if you have a bad thermostat? Is there non-condensable in the system? Meaning you could also have moisture floating throughout the refrigeration central air units
Did they pressure and test the cooper lines and system with dry nitrogen? Do you have a leak? Are they low on Charge? Did they use a vacuum pump a device to pull and remove all the air and moisture from the system? If these steps were skipped to save on time and money every once in a while you will have moisture freezing up in a system and cause a restriction through or block the metering device.
Here are some causes of why a unit freezes up. If some of these steps were skip then you can have issues as such. Check for proper ductwork etc. There are several reasons why, but the big question is did the skip a step? central air conditioning unit
that come from the factory are checked, rechecked and then checked again.
Focus your efforts on was there damage to the unit in shipping and were all the steps completed and done on the new install correctly from startup, before you blame or call the equipment a lemon. You may be surprise on what you find?
Mike Sowder CEO, Air Concept Solutions, llc.