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  1. #1
    Join Date
    Mar 2008
    Location
    Porter,Tx
    Posts
    31

    Alarm:High Saturation Suction Temp

    Guys I have a 20ton Carrier package unit.Has 4 scroll compressors 2-per circuit (R22)and its couple of yrs old.#1 runs fine and #2 after 15mins goes into this alarm.It being a RTU and 100 plus(outside of Houston,Tx),my suction is 80psi w/both compressors running and 325 high side.Feeling the liq line and compareing to the other circuit it is just alittle warm where the other is hot.For a RTU,I think that the pressures is close,but when the unit shuts off my gages indicate under charge(suction does not peg,only 80-90).Guys I know that my descriptions amounts to someone just rambling on but for now this is what I have.
    If someone could explain what causes this alarm and why the unit did not trip on high super heat which (I think) is the suction line being to hot for both.I want to try and understand HSST is.The unit is 48/50AJ w/VFD and has the Comfortlink controls.Does this unit show what the SST is on the display?Thanks for any directions from a misfit----CJ
    More info to come Monday afternoon

  2. #2
    Join Date
    Apr 2007
    Location
    Pa
    Posts
    758
    You need to add more info. If you are saying the one liquid line temp is hot compared to the other that should point you in the right direction. Make sure coils are clean, condenser fan motors opperating and get super heat and subcooling

  3. #3
    Join Date
    Jul 2005
    Posts
    5,157
    Quote Originally Posted by CJ Courtney View Post
    Guys I have a 20ton Carrier package unit.Has 4 scroll compressors 2-per circuit (R22)and its couple of yrs old.#1 runs fine and #2 after 15mins goes into this alarm.It being a RTU and 100 plus(outside of Houston,Tx),my suction is 80psi w/both compressors running and 325 high side.Feeling the liq line and compareing to the other circuit it is just alittle warm where the other is hot.For a RTU,I think that the pressures is close,but when the unit shuts off my gages indicate under charge(suction does not peg,only 80-90).Guys I know that my descriptions amounts to someone just rambling on but for now this is what I have.
    If someone could explain what causes this alarm and why the unit did not trip on high super heat which (I think) is the suction line being to hot for both.I want to try and understand HSST is.The unit is 48/50AJ w/VFD and has the Comfortlink controls.Does this unit show what the SST is on the display?Thanks for any directions from a misfit----CJ
    More info to come Monday afternoon
    Read the manual. The answers to your questions are in there.

  4. #4
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,058
    I don't know about your unit, but it sounds like it's monitoring suction pressure via~transducer and doing a conversion to temperature (hence the high SST alarm)

    this alarm would lead me to believe that your controller thinks the suction pressure is above it's alarm parameters for a set time.

  5. #5
    Join Date
    Dec 2009
    Location
    Fort Worth, Texas
    Posts
    142
    unit uses thermistors. you cannot troubleshoot refrigerant problems without information. what is your superheat, what is your subcooling. are thermistors accurate. comfortlink will show you what the tempertures of the thermistors are, if the machine is using exvs it will show you % open. so first off get the manual and read it then check your thermistors and get subcooling and superheat.

  6. #6
    Join Date
    Jul 2005
    Posts
    5,157

  7. #7
    Join Date
    Mar 2011
    Location
    Northeast Missouri
    Posts
    61
    I would agree that reading the manual to familiarize yourself with the unit should be your first step. In the alarms and alerts section it will give you possible causes to your issue. I have alot of time on this particular unit so if you can provide more accurate details (sh/sc etc) i'm sure we can help you.

  8. #8
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,668
    Quote Originally Posted by CJ Courtney View Post
    Guys I have a 20ton Carrier package unit.Has 4 scroll compressors 2-per circuit (R22)and its couple of yrs old.#1 runs fine and #2 after 15mins goes into this alarm.It being a RTU and 100 plus(outside of Houston,Tx),my suction is 80psi w/both compressors running and 325 high side.Feeling the liq line and compareing to the other circuit it is just alittle warm where the other is hot.For a RTU,I think that the pressures is close,but when the unit shuts off my gages indicate under charge(suction does not peg,only 80-90).Guys I know that my descriptions amounts to someone just rambling on but for now this is what I have.
    If someone could explain what causes this alarm and why the unit did not trip on high super heat which (I think) is the suction line being to hot for both.I want to try and understand HSST is.The unit is 48/50AJ w/VFD and has the Comfortlink controls.Does this unit show what the SST is on the display?Thanks for any directions from a misfit----CJ
    More info to come Monday afternoon
    Well CJ I would be willing to bet you have a version 2 or version 3 software in there . There are actual pressure transducers on the suction of the compressors but thermistors on the condenser giving you that discharge pressure reading. Start your unit up earlier in the morning when it`s cooler I think your alarms are happening at start-up. Yes it show`s the SST in temps.And just confirm your suction pressure transducers for accuracy.
    Last edited by Dallas Duster; 08-28-2011 at 01:12 PM.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  9. #9
    Join Date
    Feb 2011
    Location
    colorado mountians
    Posts
    117
    Just a thought, this thing have hot gas??

  10. #10
    Join Date
    Mar 2008
    Location
    Porter,Tx
    Posts
    31
    Thanks for all the replys and it has the verison 5 controls and does not have hot gas.This is the very first problem with this unit since it was installed about 2yrs ago right before school started.I did not know about the transducers,I will check that out and see what the actural gage psi is and see what the display shows.In the book under alarm code T123 all it says is high load(which the other circuit will run)and TXV problem.Guessing what "Goodlistener" is saying that the transducer is off from actural gage pressure.Thanks for some guidence and I will go through the manual and read alittle.Hope the school dist. appreciates the outside help,I do---Carroll

  11. #11
    Join Date
    Dec 2002
    Location
    Philly Area
    Posts
    133
    Hey CJ,

    if it hasn't been done yet, you can increase your Hi SST alert delay from the factory setting of 10 minutes up to 30 minutes. this will allow the logic to give the unit a little more time to start bringing the RAT down before it begins to think the load is greater than the unit can handle.

  12. #12
    Join Date
    Mar 2008
    Location
    Porter,Tx
    Posts
    31
    Where can I take alook at that?Guessing Configuration,just for my own info---CJ

  13. #13
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,668
    Quote Originally Posted by CJ Courtney View Post
    Where can I take alook at that?Guessing Configuration,just for my own info---CJ
    Configuration---Cool-----H.SST usually this will knockout both circuits sounds like there is something else going on to me. Good luck.

    Also checkout the REV.R right before H.SST and make sure it says Yes, might save you some nuisance alarms in the future.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

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