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Our central air unit is not cooling properly. it is cold on the high side and warm on the low side. The pressure is well below what it should be and there is 6# of freon. also the sight bubble is showing no bubbles. any suggestions what may be wrong? the unit is only a year old.

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There are no bubbles because there is no liquid to have bubbles in. From what you describe you are nealy out of refrigerant

Posted on Jun 03, 2010

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R-22 home condenser unit low side and high side pressures when running


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Air Conditioner freeze ups cause an A/C to blow little to no air through the vents, and the air is usually warm.

There are three basic reasons for air conditioner freeze ups:
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1) The two most common causes of insufficient air flow are dirty filters and under sized ducts. A dirty filter limits air flow which in turn allows the cooling coil’s temperature to drop below freezing. Replacing the filter, monthly, usually alleviates this problem. Under sized ducts will also cause the system to freeze because it also limits the amount of air flowing over the cooling coil. This results in lowering the coil temperature and allowing the humidity in the air to collect on the coil and freeze.

2) Low Refrigerant Charge. The refrigerant system teeters on a delicate balance. If the system is not charged correctly, the system will not function properly. This malfunction may result in the poor cooling output and/or freezing up. Only a qualified, certified service technician can properly test and charge a refrigerant system. Check your small high pressure line (should be hot) and low pressure line (should be cold, but not frozen).

3) Outdoor temperature. If temperatures are too low, the system will not operate properly, and freeze up may occur. The outdoor unit does not function well in temperatures below 60 degrees F. A special “ambient temperature” control must be installed to allow the unit to run properly in cool temperatures, or you may open your windows and save energy. If the A/C is set lower than 70 degrees F, special adapters are required to be installed.

on Jul 10, 2010 | Heating & Cooling

1 Answer

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That piston is the metering device. On the liquid line, before the metering device it is always warm (this is sub cooled, high pressure liquid), but should flash to low pressure, lower temperature vapor once it passes through the metering device. The suction and liquid line never connect together.The liquid line brings liquid from the condenser to the evaporator. The suction line brings super heated vapor from the evaporator to the compressor. Since the unit does run, I'd have to put a gauge on it,but if I had to guess, I'd guess you have high head pressure. Check for dirt or debris on the condenser, check for proper clearance of the condensing unit and check for operation and directional rotation of the condenser fan. This could also be the result of an over charge.

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What does it mean when the High side gauge is below 100 psi on my central air


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it sounds like your low pressure switch is cycling the unit on and off, TURN IT OFF! The compressor is cooled by the suction gases returning to it, if you continue to run it this way you could kill your compressor! the pressures will vary depending on the conditions, (a quick check is: almost always the big copper line leading to the unit should be cold and dripping water with the unit on).

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Freon is low, go to walmart and buy a R134 kit with guage attached (not very expensive. Connect it to the low pressure side of the A/c system (don't worry the connection won't fit on the high pressure side) Read the guage on the kit and add as neccessary. It truly is that simple.

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90 percent of the time the freon charge is low and lack of freon lessens the amount of compressed heat that can be created and also the amount of heat that can be extracted. hence less cooling and less heating. however the exact same thing can occur when a change over valve gets stuck partially between heat and cool . it then mixes the hot and cold together and you get poor cooling and poor heating. you check it with a gage. fed law requires that you have an epa certification to apply a gage. low pressures in heat and cool on both high and low pressure gages are a sign of low charge. if low pressure and high pressure are close to the same on both gages then a good chance valve is stuck half way between. you can also sometimes check by feel . at the change over valve two lines should be virtually to hot to touch and two should be cold to the touch. one is heating flow and other is cooling flow. if the valve is stuck then temps will be within a few degrees of the same on all. low charge and the hot lines won't be hot hardly .and the cold line s barely cool. look for white frost forming in the heat mode outside at the condensor tubing shortly after you turn on the heat. thats a sign of low charge. good luck.

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1 Answer

Central air conditioning unit


the large tube. it should be very cold
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