Champion R15 pressure - switch wire size?

by Ron
(Wiggins, Mississippi)

I am converting my Champion R15 from a 3 phase 5hp motor to a single phase 5hp motor, as the 3phase motor required use of a phase converter that cost 1/3 of the power of the motor.


My question is in regard to the wiring of the pressure switch into the magnetic starter.

Is the wire gauge for the pressure switch circuit the same gauge as the line in and out to the motor?

Switch is in the control circuit and should not require the same size wire.

Also, is there a size requirement for the pressure switch for this application?

Thank you.

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Dec 03, 2018
Champion R15 pressure switch wire size?
by: Ronno6

Yessiree. 1750RPM 184T Frame.

Dec 03, 2018
Very cool.
by: Doug in s.d.ca.

the inability to "Leave Well Enough Alone" is not a flaw, at least compared to "it works, so that's that."

The only question I had was what the Doerrs' rpm was - 1750?

Anyway, good work as far as I can tell.

Thanks for keeping us posted.

Dec 02, 2018
Champion R15 pressure switch wire size?
by: Anonymous

Among my character flaws,the inability to "Leave Well Enough Alone" sometimes rears its head.

Not being satisfied in the #10 wiring and needing to rewire the pressure switch,I stripped the wiring and starter from the compressor, replacing those components with the original ITE starter, #8 wire into and out of the starter, and #14 to the pressure switch. This allows me to safely keep my 40A breaker in the circuit.

All is well,and the compressor runs up to 160# without any difficulty. I may go to 175#. We'll see.

Dec 02, 2018
Champion R15 pressure switch wire size?
by: Ronno6

The motor being replaced is a 5hp 3 phase Doerr, ITE starter, Phase-A-Matic phase converter and #10 wire from 30A breaker (6' line length,)from starter to motor(2") and from starter to pressure switch (2'.)

The pressure switch is a Square D, but was acting up, not energizing with pressure drop.

The new components are Baldor 5HP 230v 1 phase same frame as original L1430, 1725 RPM, starter offshore rated for 5HP 1 phase, Square D pressure switch, contacts rated for 10A 535v.

I intended to use #8 wire from 40A breaker to starter, and from starter to motor, but could not connect to the starter in a satisfactory manner.

Upon recommendation from the seller of the starter, I wired using 10ga solid copper and everything is running fine so far.

However, the press sw, wire is a couple of inches too short, and I need to rewire in order to allow the sw. cover to be installed.

I will probably use #14 solid copper for that. I am currently using a 40A breaker, but will install a 30A breaker to match the capacity of the wire.

Any recommendations?

Thank you.

Dec 02, 2018
Oops - Correction
by: Doug in s.d.ca.

I wrote "re-use whatever wiring is there for the 3 phase on the two phase, "

Should read "re-use whatever wiring is there for the 3 phase on the two wire, "

Sorry for any confusion.

Dec 01, 2018
Champion R15 pressure switch wiring
by: Doug in s.d.ca.

"Is the wire gauge for the pressure switch circuit the same gauge as the line in and out to the motor?

Switch is in the control circuit and should not require the same size wire."

Correct.

"Also, is there a size requirement for the pressure switch for this application?"

Well, sure. But it's pretty safe to say it's minimal.

You don't say what the existing components are, but most likely, you can drop in the new motor and re-use whatever wiring is there for the 3 phase on the two phase, given the relatively short wire runs. You'll have at least one extra wire, which you can leave disconnected (at both ends) or remove, your choice.

There is a *slight* chance you'll want bigger wires from the starter to the motor, but it's likely the existing wires are plenty big enough.


Dec 01, 2018
Champion R15 wire
by: Moderator

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