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    natkingcole's Avatar
    natkingcole Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 5, 2009, 04:09 PM
    Replacing M7 single line break thermostat
    My old thermostat says Berko Model M7
    18amp 277vac
    22amps, 125,250vac
    Single line break
    I replaced it with a 4 wire and capped 2 off but even on low the heat is cranking out help please
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Nov 5, 2009, 04:44 PM
    Sounds like the thermostat you installed is intended to control both lines, and cannot offer adequate resistance when controlling only one. If wiring both lines isn't an option (due to available wires at the point of installation), you will need to find one intended for single-line break applications.
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