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    moswaldn's Avatar
    moswaldn Posts: 2, Reputation: 1
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    #1

    Jun 23, 2009, 11:24 AM
    Wiring a Water Pressure tank Switch
    I am installing a new water pressure tank and am wiring up the pressure switch. It has 4 electric contact screws, the outside two are labeled L1 and L2. The middle two are M in a circle. The pump is wired 220. Which screw contact do I hook up to the service box and which to the pump, and do I use all 4 since I am using 220--two line and two load?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jun 23, 2009, 12:12 PM
    L = Line, so the two live feeds form the service disconnect switch connect here

    M = Motor, so the two load wires going to the motor connect here.

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