Intermatic T104 wiring (simple terms)

The black and red wires are the "hot" wires and the green wire is ground. This switch is a "double-pole, single throw" switch, meaning that it opens and closes both hot wires simultaneously. Connect the black wire from the breaker panel to terminal 1 (line) and the black wire from your pool pump to terminal 2 (load). Connect the red wire from your breaker panel to terminal 3 (line) and the red wire from your pool pump to terminal 4 (load). Having said this, I would double-check the ratings plate on your pump motor to be sure it is 240 volts. It should be fed from a common-trip circuit breaker that disconnects both sides of the line when it is turned off.

Regarding terminal "A": The wiring diagrams provided by Intermatic do not designate what this terminal is for. Without physically examining this timer I cannot specifically say what it is for. However, if you see nothing connected to it internally, you can probably use it for a neutral wire connection.

Since your salt converter has a black, pink, and green wire, I would connect it as follows: black wire on load terminal 2, pink wire to neutral (white) wire, and green to ground. This is a 120 volt connection. If it is 240 volts, connect the pink wire to terminal 4. Make sure you know the voltage before you energize any of this equipment or you could be replacing all of it.

You will notice a green screw terminal on the front of the timer - this is the grounding screw. ALL of the green wires must be connected together and bonded to this screw. You should also have a green wire running from your breaker panel to the pump motor for an electrical ground for the pump. I would install one if none exists. You can never be too safe when working around water - especially a swimming pool - with electricity.

Good luck - I hope this answers your question.

I assume since all you mention is black and read and black and "pink" that both units are 240v, so you do not have to worry about any neutrals.

"A" is not used in your application. This is where the neutral would go if you had a 120v clock motor in the timer. You do not. You can ignore "A".


The ground should be run with the circuit conductors. I would hope no matter how old the installation is there is a correct ground present in the circuit. You can use the same ground from the panel to the clock and then to both loads.