Results 1 to 19 of 19

Thread: Gah

  1. #1
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Gah



    Anyone had probs with Excalibur units seizing up standby compressors?



  2. #2
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Yes but due to poor install procedures

  3. #3
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Quote Originally Posted by cadwaladr View Post
    Yes but due to poor install procedures
    Cheers for that, sounds like you have experienced it, maybe you could enlighten me ? It would be appreciated

  4. #4
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Oil levels need to be adjusted I have two customers who have had failures in less than one month both of th e m had the units fitted at the same supplier,and the GAH engineer informed them that shortage of oil was the cause.

  5. #5
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Ok , yes been there, reduced oil added when new comp fitted to allow for residual oil , then added extra on next comp, to no avail, both times recommend suction filter was fitted ,complete system was cleaned out by gah , also to no avail, another comp fitted without hg defrost, no good either, swopped from 404 to 134, yes you guessed it, seized comp very interesting problem.

  6. #6
    Join Date
    Dec 2010
    Location
    devon
    Age
    52
    Posts
    837
    Rep Power
    24

    Re: Gah

    are u fitting seltecs or q comps? is there any oil left in the comps that seize and does it have the correct size pulley on electric motor? one issue i have had recentley was on a 24 volt version the dropper putting out only 16 volts just enough to bring contactor in but not enough volts to spin those condensor fans quickly enough also never fit a comp when seizure occured without suction filter u will be back time and time again

  7. #7
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    All comps were supplied by gah as the suction filters and driers
    As for the low voltage havnt checked that but the pressures were fine with 28 degs ambient so con fans were doing their job,incidentally, were the suction filters are fitted is a bit stupid as they are between the LP switch and the comp so as it chokes their is no LP protection for the comp , am trying a couple of experiments at mo, in view of the history am not over hopeful !

  8. #8
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Cleaning a system is a very long task and no shortcuts,surprised that the whole system was not replaced if it's as bad as you make out,changing from 404 to 134 will make no difference to a contaminated system don't understand the logic in that?,What type of truck/ van is it on does it have a speed reduction clutch fitted to the road compressor the lp will still operate if the suction filter blocks it would only be the same as having a service shut off valve mounted downwind you close that the pressure drops lp cuts unit out,think I would examine that oil again to see if it's going grey! Asap

  9. #9
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    The change from 404 to 134 is apparently done quite often by gah
    If problems are encountered and the box is not required for freeze they must be unsure if it is contamination and want to reduce the load on the comp
    On stripping the last comp the oil carried no apparent metalic residue and was surprisingly clean, yep fine on shut off valve on high side shutting system down on LP , but with a blocked filter between LP switch and comp suction twill keep running till destruction ,
    I am thinking maybe it's lazy oil and migrates to an obscure region of the system every now and then for a rest !

  10. #10
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Ok put a fitting close to the compressor to adapt an lp, guess there is no suction filter on supply to standby compressor

  11. #11
    Join Date
    Dec 2010
    Location
    devon
    Age
    52
    Posts
    837
    Rep Power
    24

    Re: Gah

    if your suction filter is blocking that bad u have to flush system and like cad says lp will trip as far as gah changing 404 to 134 it dont happen 404 has a better oil recovery pressures are less on 134 but u need to change pressure switches power valve etc etc we need more facts i pressume its a tm comp? is the unit a heat model and i pressume u are measureing oil in comp not just fitting it? out of gah i have had comps with 250 cc oil in far far to much u will seize it in ahr if u had a oil issue comps would be dry and engine comp gets its first my advise is to start from fresh i personally run all chillers on 68 oil freezers on 32 unless hermetic comps hubbards on 48 check ur cages flush it remove both comps and oil as should be and check ur superheat/ also fit temp sensor on body of comp when testing if it gets warmer than 87 dc on body its seizing if it needs flushing remove all ur check valves cage and flush forever suction filter on stby and engine main drier and start again if u cant nail a gah start again and if u have trouble with a excalibur dont look at a fs7

  12. #12
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Wow... Thanks for reply The suction filter is not blocking I added the comment about the position of the filter in relation to the LP switch as fitted by gah as not satisfactory in my opinion,( I still don't see how you can say it will cut out on LP if the suction filter gets blocked) as after 5 compressors were fitted I decided to have a look, I have fitted a used sby comp and used rl68 check valves were ok a body temp test gave a max of 67dc , and gah have changed 404 to 134 c/w
    Valve & power head etc, as for not being able to nail an Excalibur this Excalibur has had what should be the most knowledgeable engineers putting it beyond economical repair , we have an old super sabre that has given little problems, indeed I fitted a comp on it 7 years ago and it's still a good unit appart from the hydraulics , but it will be going to the scrap heap this year as the wagon is falling to bits, our others in the fleet are xarios, supras and tk ts (26) never had anything like this before, I guess an fs7 is another gah? If so no chance of me putting a manifold near one ,would never buy one! Cheers for your comments

  13. #13
    Join Date
    Dec 2010
    Location
    devon
    Age
    52
    Posts
    837
    Rep Power
    24

    Re: Gah

    unit thats had five comps has had poor engineers some one aint doing there job right full stop sometimes its time limitations sometimes its ignorance..... item 7 i have taken as suction filter blocked? if suction filter blocks with debris this limits pressure via system and trips lp lp switch is in suitable position to work on stby and engine if u are just killing stby comps and not engine comps its a speed issue with spin speed of comp u ask cad how many engine comps to stby he fits ten to one cad? excaliburs are in my humble opinion a cracking unit but like all stuff sometimes they need love and if u are ripping it of to i will lberate it from u ta charlie

  14. #14
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Something wrong here I can hear alarm bells ringing!!!this unit should have been scaring people when the second one failed,is this unit running on standby in an oven? Is the condenser clean you must have airflow over this comp to cool it,glad it's not on my patch but think. I would take it on just to nail it.

  15. #15
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Thanks guys, liberate it ? Haha Naw!! There is nothing made that's not fixable, yes the beast does in sby not road comps sby comp rpm is spot on so not over reving , our units don't get much use on road compared to sby and only in short hops, alarm bells ring for me when manufacturers want to take it off hg df and change the gas early on in the comp demise chain, sorry if my mentioning the suction filter implied it was blocked, it wasn't, it was purely my observation that in my opinion
    LP switch..... Suction filter.......compressor
    should not be the order of things and I still hold that opinion
    And should this filter become restricted or worse the return flow of life to the comp would be reduced or stopped yet the LP switch would still be in the residual pressure and not shut the unit down, assuming the trip pressure of their switches isn't surprisingly high. road comp would of course still be protected.
    if my choice had to be gah it would be a sabre without the hydraulics, thankfully it's not , think I may employ some punkawallers for this unit !
    Yes con matrix is Crystal clear and we don't park it in an oven, nor do we transport hot bricks straight from the kiln
    Seriously guys thanks for your time and input to a brain that's loosing it's edge ?

  16. #16
    Join Date
    Oct 2009
    Location
    Ireland
    Posts
    27
    Rep Power
    0

    Re: Gah

    Is this unit 3phase, if so I reduced the motor pulley diameter on a few of them years ago to slow down comp speed as I had a few of them go

  17. #17
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Thanks Mick, I have solved the problem now permanently!!
    Fitted a xarios 600, but will bear that in mind as unfortunately have two more in the fleet, think I will do just that before next summer, cheers

  18. #18
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Gah

    Gah units remind me of something made in a garden shed ,but they work to an extent but you do get what you pay for with them and Hubbard.

  19. #19
    Join Date
    Jul 2012
    Location
    uk
    Posts
    9
    Rep Power
    0

    Re: Gah

    Thanks cad, yes all true, but think I would disown one if it had come out of my garden shed !!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •