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  1. #14
    Join Date
    Apr 2002
    Location
    Dallas, TX
    Posts
    2,987
    Originally posted by freezerfixer
    i was talking to a friend of mine that works for another service company the other day about superheat and he said "I have never had to check superheat like you do."
    i think he is more of a "beer can cold" kind of guy. [/B]
    If he drinks enough beer and has good sensitivity to temperature, he may do ok

  2. #15
    Join Date
    Mar 2006
    Location
    OKC, Oklahoma
    Posts
    61

    Smile

    Originally posted by Andy Schoen
    Originally posted by freezerfixer
    i was talking to a friend of mine that works for another service company the other day about superheat and he said "I have never had to check superheat like you do."
    i think he is more of a "beer can cold" kind of guy.
    If he drinks enough beer and has good sensitivity to temperature, he may do ok [/B]

    hahaha you might be right! theres only one way to practice.....drink more cold beer!

  3. #16
    Join Date
    Apr 2005
    Location
    Central Indy
    Posts
    153
    What about your charge? If your were low on gas, and the box had a big load on it, wouln't that cause the txv to hunt? I've worked on units that do fine until you put a load on them, just a thought.

  4. #17
    Join Date
    Mar 2006
    Location
    OKC, Oklahoma
    Posts
    61
    Originally posted by hvacmike33
    What about your charge? If your were low on gas, and the box had a big load on it, wouln't that cause the txv to hunt? I've worked on units that do fine until you put a load on them, just a thought.

    in a low charge situation,your valve would probably be wide open trying to keep up with the load. the liquid refrigerant would be boiling off to a vapor really quick and the sensing bulb wouldn't get cold....valve continues to stay open.
    also, i wouldn't think that you would be able to flood the evap. with liquid if there wasn't a solid column of liquid coming to the TXV. depends on how low the charge was.

  5. #18
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,646
    Originally posted by freezerfixer
    sounds like the valve is oversized. I replaced one the other day and misread the model number of the coil and put in too big of a cartridge. (sporlan "Q" body valve kit)
    the valve could never find its happy spot.
    my superheat would be 20 degrees and then the valve would open up and drop to no superheat at all within seconds.

    anytime i build a valve, if i am between two sizes of orfices, lets say a 1 1/2 or 2 ton, i always go with the smaller size.
    i may have to open the valve a little, but at least I'll have a more consistant superheat.
    Very good point, a to large of a valve will work bad. Also a dirty coil will cause the same!

  6. #19
    Join Date
    Jul 2003
    Location
    ALABAMA
    Posts
    230
    I agree here with checking the size of that valve. I have only had to adjust the SH on several TXV mostly on the new refrigerants used now. The TXV is very reliable device.
    I have a buddy that works for sporlan and he always tells me that adjusting the SH is a last thing to do.

  7. #20
    Hey everyone !! im new to the website . hope all is well with everyone . got a problem . my compressor has ice on the body .( 404A W/I Freezer) after reading some of your replies, i need to understand how to correctly adjust my supperheat . i made some adjustments to the txv. got the system down to -4 degrees everyone happy .except for me cause my sight glass was not full . i added more 404 made another adjustment now my compressor is iceing up! and they loaded the W/I for the weekend (40x60)big box! im worried im hurting the compressor.

  8. #21
    Join Date
    May 2000
    Location
    Monmouth Junction-NJ-USA
    Posts
    6,029
    Quote Originally Posted by OntimeJ View Post
    Hey everyone !! im new to the website . hope all is well with everyone . got a problem . my compressor has ice on the body .( 404A W/I Freezer) after reading some of your replies, i need to understand how to correctly adjust my supperheat . i made some adjustments to the txv. got the system down to -4 degrees everyone happy .except for me cause my sight glass was not full . i added more 404 made another adjustment now my compressor is iceing up! and they loaded the W/I for the weekend (40x60)big box! im worried im hurting the compressor.
    You should be very worried about hurting that compressor.
    Open to much and you will be slugging the compressor with liquid and BAMMM. The comressor is built to compress Vapor Liquid. I surely would not attempt to perform brain surgery unless I knew what made it tick.
    Here is a link that might be helpful. Are you a tech or and end user??

    http://hvac-talk.com/vbb/showthread.php?t=80383
    If you really know how it works, you have an execellent chance of fixin' er up!

    Tomorrow is promised to no one...

  9. #22
    Hello I'm new to this site and have a quick question. I have a walkin ,cooler 404A with two evaps. One is working great the other can't seem to adjust for nothing.unit is down to 40 but My superheat is super high and no amount of adjustment seems to work.my question is this, would a restriction in the the line prior to the TEV cause such a reading? The line to the working one is warm as should be but the non working is cool.

  10. #23
    Join Date
    May 2000
    Location
    Monmouth Junction-NJ-USA
    Posts
    6,029
    Quote Originally Posted by OntimeJ View Post
    Hey everyone !! im new to the website . hope all is well with everyone . got a problem . my compressor has ice on the body .( 404A W/I Freezer) after reading some of your replies, i need to understand how to correctly adjust my supperheat . i made some adjustments to the txv. got the system down to -4 degrees everyone happy .except for me cause my sight glass was not full . i added more 404 made another adjustment now my compressor is iceing up! and they loaded the W/I for the weekend (40x60)big box! im worried im hurting the compressor.
    What is the superheat?????? That will tell you if there is a problem.
    If you really know how it works, you have an execellent chance of fixin' er up!

    Tomorrow is promised to no one...

  11. #24
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    6,094
    Quote Originally Posted by gdl1968 View Post
    Hello I'm new to this site and have a quick question. I have a walkin ,cooler 404A with two evaps. One is working great the other can't seem to adjust for nothing.unit is down to 40 but My superheat is super high and no amount of adjustment seems to work.my question is this, would a restriction in the the line prior to the TEV cause such a reading? The line to the working one is warm as should be but the non working is cool.
    Gdl1968
    This thread is 3 + years old, you might want to ask your question in a new thread
    http://hvac-talk.com/vbb/newthread.p...newthread&f=12

  12. #25
    Join Date
    Dec 2011
    Location
    San Bernardino County
    Posts
    112
    I find that if you need to adjust superheat it's better to replace. I work in supermarkets and a store can have up to 100 txvs for different applications. Adjusting usual doesn't work

  13. #26
    Join Date
    Sep 2013
    Location
    Atlanta, GA
    Posts
    200
    Quote Originally Posted by anasmilbes View Post
    I find that if you need to adjust superheat it's better to replace. I work in supermarkets and a store can have up to 100 txvs for different applications. Adjusting usual doesn't work
    This is bad advice.... The AC and Ice Machine equipment have pre-adjusted SH settings on their valves. But in supermarkets they normally don't, and adjusting is normally required and or at least advised.

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