When working on a refrigeration system that uses a TXV you normally have a liquid receiver. This liquid receiver stores enough extra refrigerants to properly feed the TXV under any load condition. Charging this unit to a clear sight glass in most cases will ensure that you have added enough extra refrigerant to the receiver to properly feed the TXV. Refrigerant sight glass are used on the liquid piping of the refrigeration and air conditioning unit to indicate the flow condition of the refrigerant.
I saw a new one for me - hundreds or more like thousands of AC units around here but I have never seen these before.
On the high pressure side piping of the two AC compressors there is a sight glass. One was clear - so clear that you cannot really tell there is fluid in there except an occasional teeny-weeny bubble passing by. The other glass is frothy and bubbly constantly. What are these glasses for and what can I learn about the system I am seeing when I look at these glasses?
Jonathan
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Air Conditioning and Coolant/Heating Ventilating and Air Conditioning
Bubbles normally means air intrusion into a system. If it isyour air conditioner, then you most likely have a cooling coilleak. Other systems would be were you are drawing a vacuum. This ismost likely at the suction of a pump or compressor. Good luck!Actually, the bubbles could be completely normal. On the highpressure side, bubbles simply mean not all the high-pressurerefrigerant has condensed. Some of it remains as vapor. It couldmean you are low on refrigerant, or the high side temp is too high(blocked condensor maybe). In an auto, it is not unusual to have afew bubbles in the sight glass unless you're driving or have a bigfan forcing ais across the condensor. There are several reasons forbubbles in the sight glass. If one of the traditional refrigerantsshowed vapor in the sight glass it often meant there wasn't enoughliquid refrigerant being fed to the valve, and more refrigerant wasadded to the system. Blends could show flashing for the samereason, however, they can also flash when there is plenty of liquidin the receiver. Ironically, this liquid in the receiver could becausing the problem, particularly when the equipment is in a hotenvironment. Blends will come out of the condenser slightlysubcooled - at a temperature below the saturated temperature of theblend at the existing high side pressure. Yet when the blend sitsin the receiver, it can 'locally fractionate,' or changecomposition slightly by shifting one of the components into thevapor space of the receiver. This will effectively produce asaturated liquid in the receiver, at the same pressure you hadbefore, which flashes when it hits the expanded volume of the sightglass. In most cases these bubbles will collapse when the blendgets back into the tubing which feeds the valve, and the systemwill operate just fine. Check other system parameters such aspressures, superheat and amperage to confirm whether you have theright charge. Don't rely solely on the sight glass.
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