Franklin Electric Sub Drive 75 Constant Pressure system

Discussion in 'Pumps and Tanks Well Forum & Blog' started by molinsky, Nov 24, 2011.

  1. molinsky

    molinsky New Member

    Messages:
    2
    Location:
    Madison, CT
    I have had a Franklin Electric Subdrive 75 Well Pump System for approximately 6 months. It has been working perfectly until now. For the past 3 days the water has stopped after a 5 minute shower. I checked the gauge on the tank and it was reading 15 (normally around 60). There were no red fault lights. The green light was solid. About 15 minutes later I checked it and the green light was flashing and the pressure was back to normal. This has happened the past 3 days.
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,246
    Location:
    Land of Cheese
    If it is only 6 months old, you might give the installer a call for assistance.

    I have heard nothing good about these variable speed drives, except from the people who are making money selling them.
  3. valveman

    valveman Moderator Staff Member

    Messages:
    4,458
    Location:
    Lubbock, Texas
    it sounds like you're running out of water. But those things are suppposed to shut the pump off
  4. molinsky

    molinsky New Member

    Messages:
    2
    Location:
    Madison, CT
    I don't think I am running out of water because according to the manual, I should get a red blinking light indicating a fault if that happens. When it occured yesterday I started to take the rubber cap off the sensor and the pump started to run and came up to normal pressure. It has been fine so far today. I am suspicious of the sensor and waiting for it to happen again so I can bypass the sensor and see if it recovers again.
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,967
    Location:
    NW Ontario, Canada
    I don't know what sensor you intend to bypass but I hope you have a functioning pressure relief on the system, because when those controllers go awry, they can easily exceed safe pressures. Maybe you should leave it to an expert given that is should still have warranty.
  6. valveman

    valveman Moderator Staff Member

    Messages:
    4,458
    Location:
    Lubbock, Texas
    You can actually replace those "sensors" with a standard 40/60 pressure switch. It will cycle much less than when using the "sensor" as they are actually just a pressure switch with only 1 PSI between on and off. Right now that sensor is cycling the pump 45 times per minute. If you use water 24 hours per day, that is nearly 2 million cycles per month. You can also use a CSV with those type systems, and it will take out all the cycling.
  7. masterpumpman

    masterpumpman New Member

    Messages:
    729
    Location:
    Virginia Beach, VA
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