Re: 240 volt air compressor wiring advice from Campbell Housfeld skewed???
- From: techie@xxxxxxxxxxxxxxxxxxx (Bob Vaughan)
- Date: Fri, 26 Aug 2005 06:15:19 +0000 (UTC)
In article <James.Blais.1ucw96@xxxxxxxxxxxxxxxxxx>,
James Blais <James.Blais.1ucw96@xxxxxxxxxxxxxxxxxx> wrote:
>
>Hi.
>I need some help w/ this. I just bought a Campbell housfeld stationary
>upright air compressor w/ a 240 volt, capacitor start 15 amp motor. The
>unit came unwired. The owners manual shows a wiring diagram w/ two
>sides of the pressure switch; one side shows two terminals wired to the
>motor; if you lift the pressure switch cover you will see a black wire
>and a white wire running from these terminals to the motor.
>The other side of the pressure switch from those teminals (the two
>empty ones to which wiring connects from the users sub panel) -the
>wiring diagram indicates that there is a 120 volt line which attatches
>to each of these empty terminals. (240 volts total). As one of the
>wires going to the motor is white, I emailed campbel Housfelds tech
>line and asked them if they had mistakenly wired the motor for 120 volt
>instead of 240 volt? I also asked them if this unit utilizes a "neutral"
>wire in addition to two hot wires and the ground (ground being shown in
>diagram in manual, but no neutral connection shown). There reply was,
>Quote:
>
>"Our Solution :
>
>The answer to your issue is that the white and black wire coming from
>your motor is your 2 hot wires. The white wire and your neutral wire
>coming from your service panel will be put under the green screw on the
>base of the pressure switch".
>
>Thank You
>Thank you for using our system.
>
>Question: Is this a correct solution? I thought that linking a
>neutral wire as the ground or to the ground was an "old school"
>outdated and unsafe practice.
It is.
Make sure the motor nameplate rating is in fact 240 volts, and wire
it according to the wiring diagram. Ignore the fact that they used a
white wire inside the motor.
I suspect that the motor can be strapped internally for 120 or 240 volts,
and that is why one of the wires is white. In this case, if the motor is
wired for 240, the white becomes a hot.
Connect the two hot wires, and the ground, and leave the neutral disconnected.
For the wire from your subpanel, use black and red.
>Should this unit just run two hot leads to the pressure switch and a
>ground, as shown in the wiring diagram in the manual? Shouldnt the two
>hot leads running to the motor be colored black and red, and not black
>and white? (white indicating a neutral, and not "hot" connection). Is a
>neutral necessary for the circuit to function? If so, I would not think
>that the techies at Campbell Housfeld would be telling me to link a
>neutral wire to the ground wire at the compressor. But wouldnt' this be
>unsafe? (linking neutral and ground at the compressor?).
>Any help on this would be greatly appreciated, thanx, J.B.
>
>
>--
>James Blais
>------------------------------------------------------------------------
>James Blais's Profile: http://www.homeplot.com/member.php?userid=70
>View this thread: http://www.homeplot.com/showthread.php?t=57624
>
--
-- Welcome My Son, Welcome To The Machine --
Bob Vaughan | techie @ tantivy.net |
| P.O. Box 19792, Stanford, Ca 94309 |
-- I am Me, I am only Me, And no one else is Me, What could be simpler? --
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