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You do need the RPLS530A from the second link you gave for your application -- the unit comes with wiring instructions, but in short, connect the wires labeled C and 2 to the power coming in from the line, and the wire labeled 1 to the wire going out to the load (provided you're replacing a single pole switch, i.e. one with two brass screws and one green ...


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You are correct in that the RPLS740B is not directly compatible with a three-way circuit; however, since this timer uses a neutral wire for its return instead of returning via the load, you can use it to drive a SPDT relay that replaces one of the three-way switches. Another option, of course, would be to take your existing timer back and install a RPLS540A ...


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No. The device you have requires a grounded (neutral) conductor to be connected to function. There's no other way to hook it up. I believe Honeywell offers timers that don't require a grounded (neutral) connection. You might want to purchase one of those instead.


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It matters which one you replace, because that will determine which type of timer you need. One of those switches is going to be the "middle" switch, between the other two circuit-wise. That middle switch is a four-way switch, the two outside switches are three-way switches. You can determine which is which visually is you don't know the circuit layout - the ...


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You'll have to purchase a timer that is specifically designed to work as a 3-way switch. Or you'll have to rewire the other 3-way switch in such a way that it will no longer control anything. Since I can't see the wiring at the second switch, I'm guessing the wiring currently looks something like this... Which is sketchy, since there's no grounded ...


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You can also buy a digital thermostat with a pass code, no one but you can change settings


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Yes, it is just that easy. You will need a timer with a 'dry contact' or relay output. If you take power from the pump, remember it is (likely) 240 volts. Removing power from the pump will not remove power from the emergency heat strips, or from the fan. Removing power from the pump may, or may not, turn off the reserving valve (Heat mode / Cooling mode) ...



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