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Thread: Question on adjusting a pressure switch

  1. #1
    DIY Member Alexdc99's Avatar
    Join Date
    Sep 2004
    Ontario, Canada

    Default Question on adjusting a pressure switch

    My Sister has a Home Depot Diamond shallow Jet pump and would like me to adjust the pressure higher. I checked the bladder tank ans it set to 18psi, so I imagine the pressure switch is set to 20/40. How do I know how many turns on the switch to increase it to 30/50 or 40/60?


  2. #2
    That's all folks! Gary Slusser's Avatar
    Join Date
    Aug 2004
    Wherever I park the motorhome.


    You adjust it and check the pressures on the gauge. There is no set number of turns.

    Quality Water Associates

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    I think that you would also need to increase the pressure in the tank's air bladder. If I remember correctly, it should be a couple of pounds less than the low pressure turn on point.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Plumber Deb's Avatar
    Join Date
    Sep 2004

    Default Deb

    I find 20-40 to be an intolerable pressure and unless there is some question of the ability of the pump to handle the higher pressure, I believe that 30-50 is the lowest pressure you can take a half-way decent shower with and 40/60 is better. I have a 40-60 on my system.
    I think that it is a good idea to either check that the pressure the gauge is reading is correct or install a new gauge. The air in the tank should be 2lbs less than the kick on pressure for the pump and adjusted when the tank is completely drained of water. So put the air pressure in the tank to correspond to the kick on pressure you want to end up with, connect a hose to the drain at the pressure tank, adjust the pressure switch, open the drain to run water and note the pressure that the pump kicks on, adjust, drain, and check kick on pressure until it is 2 lbs over what you put in the tank. There is also no set run that you need to adjust to 30/50 or 40/60--you could have 35/55--it is just recommended that you maintain a 20 lb differential between on and off.
    The Pipewench


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