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Pressure problems head pressure 250 psig and suction pressure is at 40. txv is opening and closing because i put the sensing bulb in hot and cold water and watched my gauges. Head pressure also is bouncing alittle bit. checked temps on either side of filter drier and they were only 2 degrees apart. so that tells me it's probably not plugged. I closed my liquid line service valve and ran the air conditioner to see if the compressor would **** it into a vacuum and it did. so that tells me that the valves in the compressor are probably good. maybe the filter drier or txv is partially plugged? or is there non-condensibles in the system? freon bad? this is a 2 ton ruud condenser and was manufactured 4-04

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Not non-condensables no high head.Freon doesn't go bad. Do you have good air flow on the air handler? All dampers open? Filter clean? Nothing blocking the return air registers? If it has a belt is it good? Could be low refrigerant charge. Possibly drier. I have also seen valve bonnets lose some of their charge and cause low suction also. If the valve is adjustable try to open it more. Count your turns open so you can reset it if need be.If it doesn't raise your pressure you are back to charge or drier. Personally I don't like any temp drop across the drier. A drier should not restrict flow at all.

Posted on Jul 02, 2009

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Those seem to be very acceptable numbers you are stating if this is R22 running in summer temps. Im curious what pressures you are striving for?

Posted on Jul 02, 2009

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You have to let the system run for a while for the suction pressure to stabilize, if the metering device is a TXV pressure will rise and fall as the valve opens and closes. If this is R22 you need to get the suction pressure up

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Remove bulb and warm with hand. Watch pressures to determine if txv is functioning. I do believe there is something out now that will free a stuck r.v.. Have not tried this but inexpensive start. At 15 degrees you're liking using heat strips, possibly machine trying to do both. Good Luck

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Hello take a evap coil split (return temp vs supply temp) 18*F would be great.If it is lousy the TXV valve is restricting the flow of freon or the filter drier is clogging.Adding freon will overcharge the system and the suction will NOT improve.

Sep 08, 2010 | Heating & Cooling

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I just installed a GSC140421 using a coil CAPF


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I am working on a carrier package roof top unit about a 5 ton. My head pressure is a little low and my suction is double what it should be. I cannot valve off the unit to try a pump down to check txv. How...


you could always disconnect the sensing bulb and warm it up see if the pressures change or i would squirt some refrigerant in and get your head pressure where it should be and see what happens with the low side hope this will help?

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1 Answer

My low side is 90psig and high side 250 psig what is going on


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