I installed a Rheox on a 300D today. Let me tell you how I did it.

So first off, this is a canadian install with a third party plug. Namely the L21-20P which has five prongs. So the first step was to identify the function of his five prongs. This time, I decided to do all my multimeter measuring with the machine off. And it worked great!

I tried to approach the measuring as if I was you.lf. If you have a multimeter you can do it too.

  1. I attached an exposed L21-20P plug into his receptacle to measure

  2. I attached a exposed 120 plug into his receptacle to measure

  3. On my multimeter, I used the continuity check (buzzer) one lead on the 120VAC hot and found the Hot on his remote plug. It was G

  4. Next I connected to the neutral of his 120 plug and found W and X. Turns out neutral connected to 120 ground. So 120 neutral and ground are W and X. Which, doesn’t matter because I am after the two remaining prongs: Y and Z // You see, the above was only to identify Y and Z as the remainder prongs for remote circuit.

  5. Next, machine still off, I got continuity between his prong Y and the corner of his bridge rectifier responsible for negative DC. Kitty corner went to his shunt so I deducted this was negative dc.

  6. Lastly, by identifying the blue shunt wire, disconnecting the .250 spade, putting the machine on remote, I got continuity from the blue wire and the Z prong.



That could be enough but I went one step further. We started the machine and I measured a positive 125 volts DC at positive Z and negative Y ensuring the remote receptacle switch is set to remote.



Summary: With a multimeter, the above described all the steps necessary to identify the wiring with the machine off, then one last step measuring a live voltage. Why do I measure the live voltage. To ensure its DC meaning it’s the correct circuit.

Did I mention I installed a flyback diode. Flyback diode protects my gear from reverse voltage spikes.

Alright, so here is the deal, I saw that his two wires, in this case blue and brown, the brown leads straight to the brigdge rectifier. That means, in this case, that is the positive wire that you hookup the black wire of the flyback diode. I worded it that way because the blue wire never goes to the bridge rectifer, rather the rheostats.







The Wizard of Rod