rack question

[ice cuber]

I got a call the other day with a meat cooler being too cold. I adjusted the sorit to acheive the desired temp. My question is do these valves ever really get out of adjustment or could it be possible it was a superheat issue with the TXV?

[condenseddave]

They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.

Superheat has NOTHING to do with case temps. A TEV that is causing case temperature problems is called a liquid line restriction, and adjusting an EPR won't correct that.

[mspanky]

SORITs have moving parts that wear with time. Eventually they can flucuate greatly and stick at the high and low points of its swing. It is a common valve to rebuild.

[mccool]

Common thing at this time of year, to have to tweak the fresh meat cases/coolers. They are usually set as cold as possible with meat almost freezing at rear of case, the effect of the colder ambient on the liquid temp., txv capacity, average suction pressure etc. will translate to enough difference to freeze that meat that was just getting a slight frosting before.

[dixie2005]

Originally posted by condenseddave
They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.

Superheat has NOTHING to do with case temps. A TEV that is causing case temperature problems is called a liquid line restriction, and adjusting an EPR won't correct that.

I disagree that superheat has nothing to do with case temperatures. I agree that it's not one of the primary factors that you are looking at when adjusting case temps, but an high superheat condition at outlet of evap will cause TXV to starve coil hence raising temp right? This might happen when powerhead is toast or system undercharged or restriction in LL or whatever...not a primary cause...but high superheat can be a problem...

[rayr]

I disagree that superheat has nothing to do with case temperatures. I agree that it's not one of the primary factors that you are looking at when adjusting case temps, but an high superheat condition at outlet of evap will cause TXV to starve coil hence raising temp right? This might happen when powerhead is toast or system undercharged or restriction in LL or whatever...not a primary cause...but high superheat can be a problem...

High superheat is the result of a problem. Which came first, evaporator starving or high superheat???????

[Edited by rayr on 12-13-2005 at 02:48 PM]

[dixie2005]

Originally posted by rayr

I disagree that superheat has nothing to do with case temperatures. I agree that it's not one of the primary factors that you are looking at when adjusting case temps, but an high superheat condition at outlet of evap will cause TXV to starve coil hence raising temp right? This might happen when powerhead is toast or system undercharged or restriction in LL or whatever...not a primary cause...but high superheat can be a problem...

High superheat is the result of a problem. Which came first, evaporator starving or high superheat???????

[Edited by rayr on 12-13-2005 at 02:48 PM]

I agree.

[bryan l]

Meat managers also dont know WHAT temperature they want the cases from week to week. One week they want it 2 degrees colder, the next they want it 2 degrees warmer. Nature of the meat dept.

[condenseddave]

Originally posted by dixie2005

Originally posted by condenseddave
They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.

Superheat has NOTHING to do with case temps. A TEV that is causing case temperature problems is called a liquid line restriction, and adjusting an EPR won't correct that.

I disagree that superheat has nothing to do with case temperatures. I agree that it's not one of the primary factors that you are looking at when adjusting case temps, but an high superheat condition at outlet of evap will cause TXV to starve coil hence raising temp right? This might happen when powerhead is toast or system undercharged or restriction in LL or whatever...not a primary cause...but high superheat can be a problem...

The important part of the phrase:

Originally posted by condenseddave
A TEV that is causing case temperature problems is called a liquid line restriction

Again, TEVs are NOT temperature control devices, they are there to regulate superheat ONLY. If one is causing a problem, correct it, but do NOT confuse this valve with something that directly effects case temp. (That was a "PERIOD" at the end of that sentence, for clarification.)

[dirtyboy103us]

Originally posted by denseddave
They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.

Superheat has NOTHING to do with case temps. A TEV that is causing case temperature problems is called a liquid line restriction, and adjusting an EPR won't correct that.

i disagree with this adjusting epr wont get you temp.. even with out proper superheat..i have seen this in a few store's

my specific job is setting store's back to factory spec's
after its been adjusted and adjusted and adjusted

take a low temp rack with HP80 and crank this up to run at around 5# to 6# or lower you can get this to reach -0 to 3 in the case
with wide open sorits with superheats in the case's running from 26 to 38 degree's and lower that to 15 to 20
and you can hold ice cream

add three defrost per day with no termination on half of the case's with almost an inch of ice on the top of case it
looks like an iceberg ready to fall on the costumers

add an extra 7 to 10 gals. of oil added to a three compressor rack thats what i walk into, where do you start

well i set oil level controls that have been opened all the way and change set points on rack to start then on to sorits then down to case's, where when you open a door the case fans go off on the fan klixons because the valves are plugged with carbon sludge because of all that extra oil breaking down...[does anybody know where carbon sludge comes from] clean valve and attempt to set super heat on case,s as fast as you can because the store doesn't want you in there and the doors are getting hot from costumer's its a real challenge to get this all done at once and now the separators plugged where do you put all that extra oil coming back now do this on all racks in the store

this all due to the lack of basic training and support
from older tech,s to supervisors and management just because you can hook up a set of gages and read a meter doesn't mean you can trouble shoot a oil problem... you have to know some basic settings and everybody has to be on the same page....unless you have a set of your own store's where you go to play each and everyday and as you screw it up you can go back and fix it right to see your mistakes first hand and the supervisor's can pin point your weaknesses and get you the help that is needed and help you grow.. all i see is the new guys thrown out to the wolfs with a week of ride alongs and most are afraid to say they never set and oil level control because they wont get a raise- money should not be based on knowledge or length of service it should always be based on performance and willingness to learn.. have seen alot of older tech's that get lazy with age and instead of changing out that termination probe they know how long it should take to defrost that particular system so they shorten the fail safe time and wella its fixed and they say I'll do it next time I'm here, where its never done and here comes the new guy on the call for that same freezer six months later and puts more time because he thinks thats the problem and the fun begins

had a ruff week

when i had my store's had to adjust sorits a couple of times a year because of weathers changes on meat case's in particular

[thegoodhumorman]

[QUOTE]Originally posted by dirtyboy103us
[B]

Originally posted by denseddave
They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.



[does anybody know where carbon sludge comes from]



...from the carbon fairies of course- if only the care bears were real " Filter Bear" would keep all our system clean....

Hmm, REALLY need to avoid saturday cartoons.....

sounds like you get to follow a ref/ utility co. that would float targets ridiculously- whee!

[Edited by thegoodhumorman on 12-15-2005 at 08:07 PM]

[dirtyboy103us]

Originally posted by ice cuber
I got a call the other day with a meat cooler being too cold. I adjusted the sorit to acheive the desired temp. My question is do these valves ever really get out of adjustment or could it be possible it was a superheat issue with the TXV?

here's an easy way to trouble shoot

take your sorit setting or coil temp and add 10 degrees
you should be able to reach that temp with the door shut over nite lets say meat cooler your looking for 34 deg. well set your sorit for a 24 deg. coil temp.. its that basic and may need a small adjustment if its to cold
but if your not reaching temp now go to the valve... once you have you suction and liquid.... its in the case

if you have to run your coil temp down to say 15 deg.
your valves not feeding properly.... plugged????

[condenseddave]

Originally posted by an inexperienced little feller that thinks he knows everything

Originally posted by denseddave
They do go out of adjustment. Generally with the assistance of someone with a 3/8" nutdriver.

Superheat has NOTHING to do with case temps. A TEV that is causing case temperature problems is called a liquid line restriction, and adjusting an EPR won't correct that.

i disagree with this adjusting epr wont get you temp.. even with out proper superheat..i have seen this in a few store's

my specific job is setting store's back to factory spec's
after its been adjusted and adjusted and adjusted

take a low temp rack with HP80 and crank this up to run at around 5# to 6# or lower you can get this to reach -0 to 3 in the case
with wide open sorits with superheats in the case's running from 26 to 38 degree's and lower that to 15 to 20
and you can hold ice cream

add three defrost per day with no termination on half of the case's with almost an inch of ice on the top of case it
looks like an iceberg ready to fall on the costumers

add an extra 7 to 10 gals. of oil added to a three compressor rack thats what i walk into, where do you start

well i set oil level controls that have been opened all the way and change set points on rack to start then on to sorits then down to case's, where when you open a door the case fans go off on the fan klixons because the valves are plugged with carbon sludge because of all that extra oil breaking down...[does anybody know where carbon sludge comes from] clean valve and attempt to set super heat on case,s as fast as you can because the store doesn't want you in there and the doors are getting hot from costumer's its a real challenge to get this all done at once and now the separators plugged where do you put all that extra oil coming back now do this on all racks in the store

this all due to the lack of basic training and support
from older tech,s to supervisors and management just because you can hook up a set of gages and read a meter doesn't mean you can trouble shoot a oil problem... you have to know some basic settings and everybody has to be on the same page....unless you have a set of your own store's where you go to play each and everyday and as you screw it up you can go back and fix it right to see your mistakes first hand and the supervisor's can pin point your weaknesses and get you the help that is needed and help you grow.. all i see is the new guys thrown out to the wolfs with a week of ride alongs and most are afraid to say they never set and oil level control because they wont get a raise- money should not be based on knowledge or length of service it should always be based on performance and willingness to learn.. have seen alot of older tech's that get lazy with age and instead of changing out that termination probe they know how long it should take to defrost that particular system so they shorten the fail safe time and wella its fixed and they say I'll do it next time I'm here, where its never done and here comes the new guy on the call for that same freezer six months later and puts more time because he thinks thats the problem and the fun begins

had a ruff week

when i had my store's had to adjust sorits a couple of times a year because of weathers changes on meat case's in particular

I've seen MANY stores in MANY different chains that have 20+ year old SORITS that have NEVER been adjusted. The number of them is in the hundreds.

You have perverted my statement completely due to a complete and total lack of understanding of the purpose of these two different types of valves.

Yes, a SORIT CAN go out of adjustment on it's own, but this a very, very rare occaision.

Come back when you've read up on these valves, stay on topic, and we'll talk. Until then, you keep right on tweaking, sonny.