I have a split system air con that is gassed to correct pressure but when it is turned on both the high and low pressure sides begin to drop to about 15 psi and then unit turns off . both taps are open . its a reverse cycle model that has just been sitting for about 2 years.
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Some times, it can be many causes
settings, gass scape from system,ac relay out of range
Anyway, read pressure of system high pressure, is good and low pressure is good too make vacuums to recommend psi put gass
When the freon is low the unit will start. When the compressor starts the low pressure side drops and shut it off as the high pressure rises. The low pressure switch shuts off to protect the compressor when there is not enough freon to carry the oil to lubricate it.
Pressures look good but to know if it is charged correctly you have to do a sub cool or superheat to know for sure. Rule of thumb is if turn unit it on let it run 10 minutes. If the suction line sweats and is cold. Might be proper charge.
If you need to reset a pressure switch...then the refrigeration system needs to be checked. High or low switch looks like about a 3/4 inch Diameter plug with 2 wires & a red manual reset switch in the middle.
The system has a lot of air in it. If u haven't had any AC wk done on it that mean there is a leak in the system. System must be evacuated, pressurized & find the leak. Repair the leak, vacuum air from system & charge w proper AC gas. SPECIALIZED EQUIPTMENT & GAUGES NEEDED. good luck
The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.
As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.
If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.
When you have a moment pop the bonnet and look for the air con compressor run by a automotive belt on the side of the engine. Get the engine running at idle and then get someone else to turn the air con on whilst you watch the compressor. As the system is turned on the compressor clutch should engage and the unit should start turning, if this isn't happening there isn't enough pressure in the system (leak or just low on pressure) Get to your local air con guy and they will pressure test for leaks. Air con system is run on pressure, so that is really the issue you need to rectify
Note:- Manufacturers put the air con rad infront of the engine rad so stones get to that first, check the condition of the front rad through your bumper
will be ok compressor will not operate until system is gassed pulley will just freewheel . the oil will be put in when system is gassed a pressure switch in the air con pipe prevents it operating until at correct pressure
ok, on these units, if by high side line you mean the small tube going from outside to inside, that tube is actually on the low side, the metering device is in the outdoor unit. If you shut the unit down, let everything thaw then restart and find that small tube is freezing up right at the outdoor unit right away, my guess is its low on charge. I see that you put some in, make sure it is the right knid of refrigerant. they do not hold alot. Where is your suction pressure running. If you put 2 to 3 pounds with no change, you may have overcharged but that is telling you that there is a restriction in the line inside the outdoor unit, probably the filter if it has one, or the metering device itself. Let me know what you find.