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Old 05-28-2011, 02:49 PM   #1
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Low pressure is too low (icing suction line). First image is showing pressures with the system running. Second image the system is off after +/- 4 minutes. I am suspecting a constraint on the TXV. Please confirm


I need more info about this TXV.



EVAP MODEL: C23-51FC-1

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Old 05-28-2011, 03:17 PM   #2
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Lennox 12ACB48-3P - First REAL repair - Excited :)


basics first, how does the filter, blower wheel, or evap coil look? plugged? Is the condenser plugged?

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Old 05-28-2011, 03:36 PM   #3
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Quote:
Originally Posted by hvactech126 View Post
basics first, how does the filter, blower wheel, or evap coil look? plugged? Is the condenser plugged?
Everything is ok.
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Old 05-28-2011, 03:40 PM   #4
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Lennox 12ACB48-3P - First REAL repair - Excited :)


remove the TXV sensing bulb and put it in Hot water. Does the head go down and suction come up?
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Old 05-28-2011, 03:54 PM   #5
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Lennox 12ACB48-3P - First REAL repair - Excited :)


I removed sensing bulb but temperature and pressure have not changed. I'm trying to find the TXV replacement. I can't find online.

Condenser: 12ACB48-3P
Evap:C23-51FC-1
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Old 05-28-2011, 04:05 PM   #6
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Lennox 12ACB48-3P - First REAL repair - Excited :)


contact cozyparts
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Old 05-28-2011, 06:47 PM   #7
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Usually there is a 5 digit part # on the sticker or valve itself like "97F56". You need that number to give them and they will match it or cross reference it to the new part# and valve. May need a magnifying glass and to look REAL closely to find it.
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Old 05-28-2011, 06:57 PM   #8
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Lennox 12ACB48-3P - First REAL repair - Excited :)


I found online 26K35. I'll check next week.......Yuri, any input about what I said bad TXV?

why the pressure is different when the system is not running?
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Old 05-28-2011, 07:04 PM   #9
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Lennox 12ACB48-3P - First REAL repair - Excited :)


That digital manifold can do SH and SC. Use its features.
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Old 05-28-2011, 07:07 PM   #10
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Coil still frozen?

JJ no need to special order a txv,just pick one up at a local supply house. The only time you need an OEM one is if it's still in warranty

Last edited by Marty S.; 05-28-2011 at 07:12 PM.
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Old 05-28-2011, 07:11 PM   #11
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Yep. You need to completely defrost it and start all over. If a TX valve fails and it is rare with the old ones it will pump down when it starts. Ie: suction pressure should drop quickly while discharge is rising above what is normal (that depends on OAT and load). Need to monitor that at startup. I hate digital gauges and can't tell what you got for readings there. Dial ones and a PT chart is my method. Too much info overload with fancy gadgets is not for me. I like to see the needle move/pulsate/fluctuate and can get a feel for what the compressor is doing. Hard to teach an old dog new tricks.

The first time you get a load of "blue leak lock" or some other crap a guy put in schraeder valves to seal them and it wrecks those fancy gauges you may see why I avoid them.
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Old 05-28-2011, 07:24 PM   #12
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Quote:
Originally Posted by beenthere View Post
That digital manifold can do SH and SC. Use its features.

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Old 05-28-2011, 07:25 PM   #13
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Quote:
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Coil still frozen?

No

JJ no need to special order a txv,just pick one up at a local supply house. The only time you need an OEM one is if it's still in warranty
So I just need to know the Ton?
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Old 05-28-2011, 07:32 PM   #14
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Lennox 12ACB48-3P - First REAL repair - Excited :)


It may be a LOT easier for you if you get the OEM one. Should have the same dimensions and fit w/o any alterations. Most of the new Lennox units have special teflon gaskets/o-rings etc so unless that one uses straight flare fittings I would recommend OEM parts until you get a few yrs experience under your belt. Same thing with motors and cond fan motors. Once you understand wiring REAL well then you can use generic parts confidently is my advice.
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Old 05-28-2011, 07:39 PM   #15
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Lennox 12ACB48-3P - First REAL repair - Excited :)


Quote:
Originally Posted by yuri View Post
Yep. You need to completely defrost it and start all over. If a TX valve fails and it is rare with the old ones it will pump down when it starts. Ie: suction pressure should drop quickly while discharge is rising above what is normal (that depends on OAT and load). Need to monitor that at startup. I hate digital gauges and can't tell what you got for readings there. Dial ones and a PT chart is my method. Too much info overload with fancy gadgets is not for me. I like to see the needle move/pulsate/fluctuate and can get a feel for what the compressor is doing. Hard to teach an old dog new tricks.

The first time you get a load of "blue leak lock" or some other crap a guy put in schraeder valves to seal them and it wrecks those fancy gauges you may see why I avoid them.
The suction pressure change from 50psig ( not running ) to 12psig ( running )

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