On 6/16/2018 11:24 AM, dpb wrote:
....

... my expectation until shown different would be something
similar to

shorturl.at/rIPX9

which is picture of what Rockwell/Delta used for years and years and
years...there will be a mag switch besides, yes, but this kind of
arrangement is what I would certainly expect.
....

I just now noticed somebody removed the other two heater blocks from
this one to use it on single phase; there's no need to do that, just
jumper the neutral (L2) and leave L3 empty (or even with the heater
there; there's just no connection so totally immaterial).

--