Hobart AM14 losing pressure during rinse
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  1. #1
    Join Date
    Sep 2011
    Posts
    7

    Hobart AM14 losing pressure during rinse

    Hey guys,


    I am working on a Hobart AM14 and the things runs great except during fill and rinse when the fill valve/solenoid opens the water pressure drops from 25 psi to 15psi then 10psi within 2 seconds. I have tried adjusting the Watts water pressure regulator (model say 10-40 psi) when the solenoid is open and I still can't get it to 20psi. There seems to be no leaks in the the piping. when the solenoid closes and rinse stops the pressure slowly sneaks back to 25psi. Any ideas?

    PS this machine is set for chemical and no heat booster.



    thanks

    shawn

  2. #2
    Join Date
    Oct 2010
    Posts
    47
    Your description sounds like a classic failing regulator. The flow is reduced from usually scale build up and dirt.

  3. #3
    Join Date
    Sep 2011
    Posts
    7
    Ej,



    So I changed the water pressure regulator twice now and same thing. It doesn't matter if i set the regulator to 75psi or 20psi when the rinse solenoid/fill valve is closed, it will still drop down to 15psi then 10-11psi within 2 seconds when the machine goes into rinse or fill and the solenoid is open. Any ideas? can the water pressure just be low at only 11psi when the tap is open or could it be the fill/rinse solenoid or anything else? any help would be appreciated. This thing is driving me nuts!!!



    Thanks

    shawn

  4. #4
    Join Date
    Oct 2010
    Posts
    47
    Did you check the line strainer or any check valves inline with the solenoid? Have you taken the solenoid apart to check scale/dirt conditions?

  5. #5
    Join Date
    Sep 2011
    Posts
    7
    ej,

    line strainer was on the pressure regulator and its clean cause its new. also the solenoid is old, but it magnitizes just fine and lets the wAter in.... i did open it and its crudy but not really dirty... also how can the solenoid contribute to water pressure loss? i figure as long is there is water flow through it it should be fine right ?

    shawn

  6. #6
    Join Date
    Sep 2011
    Posts
    7
    ej,

    can the solenoid be opening up too much and reducing the pressure?

  7. #7
    Join Date
    Oct 2010
    Posts
    47
    I don't think you have a pressure problem rather a flow problem since your static pressure after the regulator is reading 25 psi. I think I would want to start removing these fittings to see what is restricting the flow. Please clarify do you have rinse pressure? Is your rinse arms spinning?

  8. #8
    Join Date
    Sep 2011
    Posts
    7
    Ej,

    There was a crap load of hard water build up in the fittings which I opened up and cleaned out and still had the problem. I changed the vacuum breaker housing, water pressure regulator, and all the pipes are clean. the only thing I didn't change out was the solenoid. I get fill water when the solenoid opens and it takes about 3 minutes for the machine to fill. Also during rinse the bottom spin arm spins slowly and the top one barely moves if that. Any ideas what I should check next? Any possibility this glow problem could be from the solenoid? But even so would that drop pressure like it's doing?

  9. #9
    Join Date
    Oct 2010
    Posts
    47
    When you had the regulator off did you open up the water line to visually inspect the flow?

  10. #10
    Join Date
    Sep 2011
    Posts
    7
    Hmm no I didn't you think it might be a flow problem before the regulator ?

  11. #11
    Join Date
    Oct 2010
    Posts
    47
    You need to identify were the problem is. You have looked at the obvious. This will tell you what direction the problem lies.

  12. #12
    Join Date
    Sep 2011
    Posts
    7
    Ej,

    Thanks I will start looking again come Monday. I'll keep you updated. Thanks again for your help.

  13. #13
    Join Date
    Mar 2008
    Location
    Over the river and through the woods
    Posts
    116
    So we are loosing pressure, rinse arms are not spinning but the unit fills up within a semi reasonable amount of time.....Have your chemicals eaten a hole in one of the inner rinse pipes? This would explain the pressure loss and the reasonable fill time. I start with pulling the rinse arms off and inspecting the pipes and the jets for obstructions. Then I pull the upper inner rinse pipe and inspect for obstructions. Then I pull the guts out of the solenoid and check for improvement. I have locations where I have had to pull the regulator to achieve correct rinse pressure, particularly where hard water is choking old plumbing....

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