Original message
| jchvac
 |  "txv's?"
, posted Tue 14 Aug 22:17  
i have run into a problem lately with a txv! here is the situation...( same everytime )... goodman 13 seer heat pump with an inertherm electric furnace, split system condenser with an a-coil inside. suction pressure 60psi, head pressure 150psi to 200 psi(r-22)( on a 95degree day with indoor temps at 85 degrees)( subcooling is 12 to 15 degrees). new system with less than 25foot line set. the coil is always freezing up on everyone i go to. I know they are not low on freon(not always) and the indoor blower is set on high speed. no restriction on air flow at all. THIS has been my solution to the problem and so far it has worked...i back all the freon back into the condensor, back the set screw out 1\2 turn in the txv, pull a vacuum, release freon back into the system and my pressures go up to 85psi on the low and 230 to 260 on the high. HAS ANYONE ELSE RUN INTO THIS CRAZY PROBLEM IN THE SOUTH EAST??????????????
it's always something simple!
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Replies:
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| farbeondriven
| "Re(1):txv's?" , posted Wed 30 Jul 23:06
i have had problems with lots of goodman units and x-pansion vlvs. one today actually 13 seer matched system brand new. heres what i do after ive verified its a vlv problem---install a fixed orfice braze the eq line shut and throw txv.
"if i had my life to do over id be a plumber" Albert Einstein
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| MechAcc
| "Re(1):txv's?" , posted Wed 30 Jul 05:35
Is the indoor coil matched to the condensing unit?
Have you measured total external static pressure(TESP) or verified total airflow for the tonnage?
Sorry to sound hard but these will be questions that a technical servive rep would ask you.
MechAcc
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| justsomeguy
| "Re(1):txv's?" , posted Sun 10 Feb 13:26
There is aknown problem with some of goodmans txv valves. As in they are crap.
BillyBob
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| Hvacraider
| "Re(1):txv's?" , posted Wed 9 Jan 11:58
It's a Goodman....what do you expect???? Are these factory valves and if not, are the sensing bulbs in the right place? ie, upstream from eq line?.. what is your static air pressure across the coil?.... Seems strange that ALL of them are doing the EXACT same thing and field adjustments of TXV's are not 100% accurate due to the home/install variables... I'd do a little more investigating as to the exact nature of this issue and make note of unit sizing as well... Are they all the same size? That kind of thing...
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| pegleg smith
| "Re(1):txv's?" , posted Fri 12 Oct 00:02
you need about 10 degrees of superheat. You are overshooting that mark if you are freezing the coil. Throttling down the TXV is the proper answer.
Semper Fi
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| | hvac-tech05
| "Re(2):txv's?" , posted Sat 8 Dec 23:02
those pressure just dont seem right to me, on a 95 degre day your head pressure for r-22 should be around 225 or 230 and your suction should be abour 70 to 75psi.
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| | the butcha
| "Re(3):txv's?" , posted Tue 5 Feb 21:46
THE HIGH SUCTION AND ICE UP , LEADS ME TO BELIEVE ITS A ISSUE OF TO SMALL OF A UNIT FOR THE JOB. DOES THE AC EVER SATISFY ?
THE BUTCHA
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