It is made by carrier. Hello, I have had 2 licensed ac repairment to my house to look at my 2 ton central unit. When the refrigerant reaches the end of … More importantly, how do I fix it? suction line pressure:not sure because low side gauge was pegged out at 120,so i dont know if i am getting an accurate reading.i did not wait for that 120 to come down though.it was 120 psi as soon as compressor kicked on. I have changed the filter dryer, vacumed, and I opened the txv inside the cased coil. But basically the A/C unit is making more cooling than the air flow can dissipate. Why would the suction line be warmer than what I typically see? have an ac system- condenser/comp unit is on top of a high rise condo, so havnt gone up there yet. ... the cold liquid refrigerant in the coils absorbs heat from the air. The heat causes the refrigerant to boil, which changes it to a low pressure vapor. The insulation has two functions: To prevent the suction line from sweating and dripping water inside the house. It … In an AC, why does a low refrigerant condition cause the evaporator, and/or suction line, to freeze up? If you do not know how the system was designed to operate, there is no need to hook up gauges. I just don't know what to check next. After the refrigerant evaporates into a gas in the evaporator coil the section of piping from this coil to the condenser coil is called the suction line. I just don't know what to check next. They simply have no working knowledge of how their AC manages to blow cool air on a hot day. Dirty filters is the first place to look. It's about 90 degrees outside - and 86 degrees inside at 5 p.m. They simply have no working knowledge of how their AC manages to blow cool air on a hot day. The house is barely cool and the unit runs all day none … Ask Question ... in both mode then I tried to get more information about the ac parts and figured out about the liquid line and suction line. They will restrict air flow. Got pressures to close to correct readings of 65 and 275 (86 degrees outside). Appears unit was completely empty of freon. The suction hose is the cold line. I have sucked the refrigerant back, and vacumed 3-4 times, but the liquid line stays cold and the suction line stays warm. This air conditioning repair article series discusses evaporator coil icing: the problems of ice and frost formation in air conditioning system air handler units, blower units, or AHU's, duct work, or other air conditioning system components. Check the suction line and see if it feels cold and is sweating. Temp out of vents inside house only coming out at 76 degrees. They both said the pressures were correct on the low and high side and did not need any freon. (i should have waited)will get an accurate suction pressure in the morning. But the experienced DIYer, who understands certain properties of the air conditioning system, can whittle down possible causes for problems. Got down to 76 overnight but is back to 78 now. I checked the hot liquid line and the cold suction line and the hot liquid line is not very hot at all as a matter of fact i would classify it more as warm than hot and the cold line is not freezing cold only cool to the touch. to the best of my knowledge i beleive that as long as the suction temperature is low we can protect the compressor from overheat and abnormal head pressure. Unit is pretty old, but I don't know exact age. Frozen suction line and evaporator coils can be caused by a few different items. If … Filters clean, a-coil clean, returns not blocked. Liquid line of outdoor AC unit is cold but the suction line is at room temperature. warm suction line, ac not cooling. Because you’re talking about low suction pressure, you might be a technician. The suction line is the larger of the 2 and is covered in black insulation. The suction line is the part of the piping system of a ac/ref unit. Just cleaned the filter. Both checked out ok. Added gas. The smaller uninsulated liquid line should be warm to the touch after the system has been operating for 10 or 15 minutes. Why is my air conditioner not cooling? Also, the 30 amp set of … To some homeowners, their air conditioner falls strictly into one of two categories: working or not working. I have changed the filter dryer, vacumed, and I opened the txv inside the cased coil. To prevent the suction line from heating up outdoors on its way to the compressor. If it is not sweating or if it is warm to the touch, you are probably low on refrigerant. When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. As i went for a site visit i noticed that one of the split or VRV (iam not confirm ) suction line is very hot what would be the possible cause or the unit is designed like that. What are some of the main causes of a liquid line being so hot that you can only touch it for about a second, while the suction line is nice and cold? 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