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2yr. old a.c. and coil(txv).Unit runs but suction pressure stays low(50 psi).Unit eventually freezes up.When txv sensing bulb in put in hot water,the suction pressure rises to correct reading,and unit cools properly.Is then txv the problem?

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  • 158 Answers

See if it's adjustable if not it has to be changed

Posted on Jul 01, 2009


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2 Answers

R22 unit running at 160/58. Took bulb out climbed to 61 on suction then right back to 58. Replaced txv. Charged to 220 head, suction stays at 60. Clean coil, no filter, good airflow. Ideas?????

Sounds like bad valves in the compressor.
A good indicator is how fast the pressure changes when you shut the compressor off. It should take several seconds for the suction pressure to rise. If it's immediate, then expect a bad valve.

Mar 07, 2016 | Heating & Cooling

1 Answer

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

I am working on a manitowoc qd452a ice machine, for a friend of mine. The problem it is making no ice at all. the coils have been brushed and filter cleaned. when i hook up my gauges the low side will...

Is the dump valve closing all the way and is the water valve letting in water and warming the water up.....during the freeze cycle. Is any of the coil getting cold. If only half of the coil is getting cold and the other not then I would add some freon..... Hope this helps

Mar 04, 2011 | Kitchen Ranges

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

If you need further help, reach me via phone at

Mar 19, 2017 | Ruud Heating & Cooling

2 Answers

Why is the highside 150psi and the lowsidee is 70psi and the compressure is very hot

the unit seems to be at normal pressure but could use a cleaning on the coils of the condensor..but remember after cleaning do another freon check it could show thats it is low that is what usually happens after u clean hope that woked for you

May 16, 2010 | Intertherm P3RA-048K Air Conditioner

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

2 Answers

Pressure problems

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?

Jul 02, 2009 | Heating & Cooling

1 Answer

Two lennox heatpump 71/2 tons

check the true psi with the line psi to see if same if psi is good in cooling 225 hi and 70 low on 80'day then compressor is fine and i would start checking for temp difference on the reversing valve sometimes this will cause high suction or high discharge psi shift it manually with by energising it be cooling or heating then pull wire and see how it shifts if shifts good then txv on out door unit could be bad what is the psi in heating on the discharge line going to the indoor unit? most prv's are set at about 350 psi r22 as for suction line size its only hot gas in hp mode os no problem their shows in cooling mode as low suction psi ..hope this helps some also make sure indoor coil is clean!....thanks & rate me

Apr 19, 2009 | Ruud UBHC Air Conditioner

1 Answer

Hoshizaki km-1300skf 3 beep error code

The 3 beeps indicates that the freeze cycle is longer than 60 minutes. with the suction pressure at 20, it sounds like low on charge (freon). I believe this is an R 404-A unit. Other things to look for are: Stuck float switch (in the up position), Water valve leaking, hot gas valve leaking, txv not feeding properly, weak compressor. Look at high side pressure too. It should not go below 210 psi during the freeze cycle. Low pressure should be in the middle to upper 40's psi.

Let me know if you need more.

Jan 02, 2009 | Freezers

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