Regular Guest
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
Professional Member
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.
What is your sub cooling? ________ super heat? _________
Decide what you want, decide what you are willing to exchange for it. Establish your priorities and go to work." H.L. Hunt
"In order that people may be happy in their work, these three things are needed: They must be fit for it. They must not do too much of it. And they must have a sense of success in it." John uskin
Professional Member*
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.
Professional Member
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.
Regular Guest
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
Professional Member* / ARP Committee
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.
Officially, Down for the count
YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET
I know enough to know, I don't know enough
Why is it that those who complain the most contribute the least?
MONEY CAN'T BUY HAPPINESS. POVERTY CAN'T BUY ANYTHING
Professional Member
Your walking freezer is building frost on the TXV?
OH NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!
Professional Member*
Where's the monty python "run away!!!!" picture at?!Originally Posted by Phase Loss
Professional Member
That's only if they "fart in your general direction"...
Professional Member
It's already walking, farting can't be too far away!
Professional Member
Regular Guest
Thanx for your advice
Regular Guest
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.
Professional Member
egads man!
what establishment can make due without their walk-in freezer? it's pushing a month now.
Give us more info to fix this thing.
Professional Member*
Slow an steady wins the race phase. Lol.
Professional Member
I bought that book refer for hvac techs. Pretty good information there.
Slow and steady will keep the calls backing up and you will never get home
Regular Guest
You are right . ,this unit was not working they were using 3 door reach-in. When i start they do not want the same guy working who change out the compressor a year ago. like i said box went down to20*F after getting info. from all the experties from hvactalk. I did accomlish a lot working on this unit. There is lot lot to be learned I will keep u updated I am going back tomorrow. I still believe system there is something wrong.
Professional Member* / ARP Committee
There must be. Box should run 0 to -10
Officially, Down for the count
YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET
I know enough to know, I don't know enough
Why is it that those who complain the most contribute the least?
MONEY CAN'T BUY HAPPINESS. POVERTY CAN'T BUY ANYTHING
Regular Guest
That's what iam trying to achieve
Regular Guest
You are right . ,this unit was not working at they were using 3 door reach-in. When i started they do not want the same guy working who change out the compressor a year ago. like i said box went down to20*F after getting info. from all the experties from hvactalk. I did accomlish a lot working on this unit,and still there is lot lot to be learned I will keep u updated I am going back tomorrow. I still believe the system is not running to it's full capacity
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