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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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Heat pump with High head pressure

HFC-134a ? Critical pressure is 588.9 a . With a 93 LL temp and 575 head, I would suspect 1. Air in system or 2. Ref. has gone critical.
With a 110 psig suction/85 deg.F and a LL temp of 93 deg.F/125 psig

Jan 13, 2013 | Ruud Heating & Cooling

1 Answer


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

Jun 23, 2011 | Heating & Cooling

1 Answer

Head pressure 250 suction 30 R-404 box temp will not drop below +10 NEW COND. UNIT & TXV OEM

What is the
"Superheat" on the suction line 6" from compressor ?
Did you change the drier and evacuate to at least 500 microns ?
What model number is the condensing unit ?
Does the system have a "Crankcase Pressure Regulator"
if so is the TXV ZP type ?

Feb 28, 2011 | Freezers

2 Answers

Ruud heatpump mod uprl024jez ser 7220m280813390 in heat mode 15 degree ambient 70 degree in house low side 55 high side starts out 250 steady climbs to out of sight r 410 reverse to cool low...

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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Mar 19, 2017 | Ruud Heating & Cooling

1 Answer

1.5 ton straight cool condenser....head pressure good at 250 psig....suction pressure will not go higher than 55 superheat indicates target suction pressure at 68 psig....o/d coil clean,...

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

1 Answer

I just installed a GSC140421 using a coil CAPF

hey there, the matching coil for your unit is a Model# CAPF4860C6A. The coil you have installed is a 13 seer where the condenser is a 14 seer. Myy guess at this point without being there is you have a hot house (80 psi suction) while eliminating more heat from the condenser (180 psi). I am also guessing you are using r-22? If you could post your super heat and subcool readings and if ou have a txv or fixed orifice (guessing txv?) I could help you pinpoint the problem.

Aug 02, 2009 | Goodman Heating & Cooling

2 Answers

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?

Jul 30, 2009 | Heating & Cooling

1 Answer

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

If it is very hot in the house the suction will be high but not that high. If you have a 13 seer inside and a 10 seer outside your suction can be that high if you don't lower fan speed. Does your unit coll ok. Another reason if it is not cooling well is bad valve in compressor but the compressor would going out on internal overload because of getting to hot. If you have TXV metering device it could be stuck open. Check sub cooling. Put a thermometer on the 3/8 line and measure the difference between that temp and the guage temp. Look at your pressure and the temp reading is nest to the pressure. The difference should be between 12 and 16 degrees. Measure Large line temp for superheat difference should be between. 12 and 16 degrees. Feed back please

Jun 13, 2009 | Ruud UAKA042 Air Conditioner

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