1 1/2 hp Sta Rite well pump pressure switch

Discussion in 'Pumps and Tanks Well Forum & Blog' started by RJB, Aug 14, 2011.

  1. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    Where do I place a pressure switch and how?
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    Generally, they are threaded into a small hole in the tank Tee. The other small port is for a pressure gauge. Sometimes they connect directly to a small port on the pump but pulses there could cause the pump to short cycle.
  3. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    Am using without tank to water lawn from lake. Want to know pressure because motor overheats and shuts down about 60 seconds of water flow. Want to find the problem.
  4. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,353
    Location:
    Houston, TX
    Measuring the current that the motor is drawing may be of more help than a pressure gauge.

    A 1.5 HP motor should be wired for 240 if possible.
    And using some big wire, if the electrical run is very long and using 120.

    120 may be safer tho...

    You may want to double check your motor voltage setting.
    And current ratings.
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    True, but RJB asked about a switch, not a guage. Not much point installing a switch without a tank.
  6. Texas Wellman

    Texas Wellman In the Trades

    Messages:
    537
    Location:
    SE Texas-Coastal
    Your pressure and your amps are inversely related. Pressure goes up, amps go down. What exactly will a pressure switch do for you? Probably cycle your pump to death.

    DonL,

    Amps kill, not voltage. You ever been shocked by a spark plug? About 20,000 volts there.
  7. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    Am curious how much pressure pump is putting out. Have 30' 1 1/2 PVC from lake inlet and 3,4 spicket coming out. 30 ft of 12 guage wire coming from my shed to pump.
  8. masterpumpman

    masterpumpman New Member

    Messages:
    729
    Location:
    Virginia Beach, VA
    Without a tank you don't want to use a pressure switch, just connect an on/off switch.
    I suspect that 30' of 12 guage wire is to small for a 1-1/2 hp pump. Look up an electrical wire/motor chart (wire size/distance/motor hp). It sounds like the motor is overheating due to lack of proper voltage/current.
    Last edited by a moderator: Aug 15, 2011
  9. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    RJB did not mention what voltage he is using nor do we know anything about the wiring from the house to the shed.
  10. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    have 40' from pole to shed and 50' from shed to pump. 12 gauge. I have a new 35/50 regulater but no pressure guage.

    Sta Rite
    Mod C48L2EC11
    Ser 7E84 RPMS 3450
    HP 1 1/2
    Type C
    A.D. Smith Corp Mebane

    Where can I get a free schematic of motor?
    Last edited: Aug 15, 2011
  11. valveman

    valveman Moderator Staff Member

    Messages:
    4,522
    Location:
    Lubbock, Texas
    Pull the back cap off the end of the motor. Check the voltage setting, 115V or 230V. My bet is you have the motor set for 230V and you are only sending 115V.
  12. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    I'll try that but wouldn't the wire get hot to the touch if it were set wrong?
  13. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,353
    Location:
    Houston, TX
    There should be a wiring diagram on the inside of the motor cover.

    True HP is 1 Horsepower for that motor;
    AC induction motor, capacitor start, Typce C, Model C48L2EC11, rated 230/115V ac, 60Hz, 9.95/19.9A, 1 hp, 3450 rpm, 1-ph, SF 1.65, Frame Size 48Y, DP, Class B, 40C ambient, continuous duty, thermally protected, auto reset.


    If the voltage is set wrong the wiring may not get hot but the internal overload would see a abnormal amount of current and trip the motors internal auto-reset breaker. Would run at half speed or less, or 2X speed until it burns up the start winding and / or start Capacitor.


    That motor should have a Voltage changing switch under the rear motor cover.
  14. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    With #12 wire you really should run that at 230 volts.

    I don't recall you mentioning what voltage you are using.
  15. RJB

    RJB New Member

    Messages:
    12
    Location:
    34488
    Have no electrical knowledge. I'm plugged into a regular house outlet.
  16. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    You'll need to get an electrician to see if 230 volts is available in the shed and if so wire in a 230 volt circuit with a double pole disconnect so that you can run the pump on 230. Also verify that the pump is actually set to 230 volts.
  17. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,081
    Location:
    NW Ontario, Canada
    First you said it was 30 feet from shed to pump, now it's 50 feet plus another 40 feet from the pole for a total of 90 feet. Is that a single 12/2 feed from the pole to the shed as well? How much more wire between the service entrance and the pole or is the pole central metering? Is there 230 volts available at the pole?
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