T103 clock not working
Please read all of this post. You may burn up the 120 volt T103 timer motor is you are not careful.
The statement: "I have 120v board with 120 constant and 240 timed" is not very clear to me as to what you mean.
In US residential wiring, the white wire is not always the "neutral;" The white wire is sometimes used for 240 volt circuits.
We cannot tell you how to wire your timer unless we know _exactly_ what you have.
If your incoming supply cable (from the breaker box) has 3 wires (black, white, and bare), there are two scenarios:
1...If the voltage from black (hot) to white (ALSO hot in this case) is 240 volts, and you have only 3 wires (black, white, and bare), then the T103 is the _wrong_ timer if you are trying to control a 240 volt load. You should use a T104 timer.
The T104 uses a 240 volt timer motor and the T103 uses a 120 volt timer motor.
2...If the voltage between black and white is 120 volts, then you will only be able to control 120 volt loads; then the incoming black supply wire is connected to terminal 3 and the white (neutral) wire is connected to the "A" terminal. The bare equipment grounding wire is then connected to the "GR" terminal.
To show the difference, if you are trying to control a 240 volt load, to use a T103 and wire it _correctly_, you would need to have a incoming supply cable with a total of 4 wires (black, red, white (neutral), and bare) Black to red would be 240 volts. Black to white would be 120 volts. Red to white would be 120 volts.
The connections would be as follows:
White (neutral in this case) to the "A" terminal
Black to terminal 1
Red to terminal 3
The 240 volt load would then connect to terminals 2 and 4
Both the bare equipment grounding wires are connected to the "GR" terminal.
Since you did not mention a red wire, I can only ASSUME that this is not the case.
Sorry, we can't tell you how to wire this timer based upon assumptions.
So, what do you have?
Dec 23, 2009 |
Intermatic T103 Indoor 120-Volt 40-amp...