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Thread: Walk in freezer
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08-27-2012, 02:31 AM #1
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Walk in freezer
i am working on walking freezer
which was not running
faulty starting component
ran unit it trip on low pressure switch.
frost on txv and distributor tubing
h.p 350 l.p 25# amb. temp 95*-100
l.p rises when not operating. l.l solenoid faulty
Replace l.l valve and filter drier . Recover (404a) freon
flush system after disconnecting txv w/dry nitrogen lots of oil came out of distributor tubing pull vacuum, break vacuum w/dry nitrogen 5# and again pull vacuum for 4 hrs. charged unit h.p 225 l.p25# box temp after 1 hr 53* frost still building on txv outlet and distributor. i am suspecting system is contaminated any idea what is going on my next step is to replace txv valve before doing that i wanna mke sure syetem is clean. is ther a way to check the system w/out opening.
any assistance or advice will be greatly appreciated
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08-27-2012, 03:48 AM #2
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charged unit h.p 225 l.p25# box temp after 1 hr 53* frost still building on txv outlet and distributor. i am suspecting system is contaminated any idea what is going on my next step is to replace txv valve before doing that i wanna mke sure syetem is clean. is ther a way to check the system
w/out opening.
With the number you show, it looked pretty good to me, maybe a little under charge. Frosting is normal.
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08-27-2012, 07:49 AM #3
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Why do you think it's contaminated when you tell us you pulled the charge and vacuumed everything? Assuming you charged as a liquid.... Without any temps other than your pressures it would seem to me you have a restriction. Would be helpful to have a superheat number to know what the expansion valve is doing. If you have a receiver then I wouldn't worry about subcooling. Superheat would be anywhere from 6-10 for my taste but maintaining your 20 degree compressor superheat. Taking a superheat reading I bet will point you the right direction.
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08-27-2012, 10:33 AM #4
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Not a lot to go on here, but I would pump it down and check and clean the tx screen... Could have a weak power head too.
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08-27-2012, 05:21 PM #5
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Thanks all of you guys for advice iam going there today I wil remember 3. things for sure They must be fit for it. They must not do too much of it. And they must have a sense of success in it
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08-27-2012, 06:46 PM #6
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So the cooler was walking before and now it's the freezer? Better catch them before they walk too far. I have read your posts. It's time to call a qualified tech and stop asking for free advice. If you really are a tech, you need some serious education. It seems all you do is change parts hoping for a fix. Pick up the Fundamentals of Refrigeration, which is standard text at the trade schools, and don't put it down until you learn something.
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08-28-2012, 03:11 AM #7
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Your walking freezer is building frost on the TXV?
OH NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!
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08-28-2012, 06:57 AM #8
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Where's the monty python "run away!!!!" picture at?!
Originally Posted by Phase Loss
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08-28-2012, 08:50 AM #9
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That's only if they "fart in your general direction"... Originally Posted by ryan1088
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08-28-2012, 11:32 AM #10
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It's already walking, farting can't be too far away!
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08-28-2012, 01:41 PM #11
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Originally Posted by Qamar
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09-07-2012, 01:04 PM #12
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Thanx for your advice
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09-07-2012, 01:19 PM #13
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check txv screen it's clean turn off avap.fan to see flow of refrigerant , frost was building all across evap coil follow sporlan instructions to adjust SH left unit running all night chk next morning box temp went down to 20*F. 1/4 turn stem to chk if it goes down further. I am debating if there is a mismatch. I have collected all the info.will do a serious anylisis.
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