electricalwiring
I have to change our sauna heater. The current heater has wires connected to Earth, N and L3.
I'm confused by the manual of the new heater as there is only 1 X N wire but the manual seems to suggest that there should be 2 (unless I've misread it).
The shop said that the wiring would be the same.
The new heater model is numbered 1 – 7 so it's the top diagram that seems relevant.
[
1
Old:
[
2
If the picture included with your question is what your current setup looks like, you don't have the neutral (white) wire that the installation instructions are expecting.
EDIT - The more I think about it, you may need to have a neutral wire so you can get the "wireless" and any other "smarts" that are in the switch itself. The diagram above will work fine for a normal switch but you may have trouble with you fancy new one.
I just did a search for John Woods thermostat wiring and found the John Wood website.
Then I used it, and your pictures to create the modified picture below.
It looks to me like you have it wired right. Also, it looks like the original wiring was done so that both the upper and lower heating elements would be on at the same time. With it wired the way you have it now, the upper element should go off when it reaches its set temperature, and simultaneously turn on the lower element. I would check this with a voltmeter if I were you.
I AM NOT AN ELECTRICIAN: JUST A DO-IT-YOURSELFER OF ABOUT 50 YEARS. So, you might want to wait for a real electrician to respond.
Click for larger view
Best Answer
The diagram gives you three possible wiring options depending on your power system. The top one is for 415V three-phase (star), the middle for 240V three-phase (delta), and the bottom one for 240V single phase.
In a normal house the bottom one is what you want. Basically connect all the N terminals together, and all the L terminals together and those are your N and L points.
Note: the lower two diagrams are the same physical connectors as the top one - they just omitted drawing in the connection 7 that not used for the lower two diagrams.