Carrier appx. 4 ton, 10 years old.

Contactor pulls in, voltage ok on the load side, zero current. Didn't check at the moment of closing but w/in 10 seconds. No sound whatsoever of compressor-like noises.

Start windings @ 2.8 ohm, run winding @ 0.7 ohm, start-run @ 3.3 ohms.

Removed cap wires, discharged, DVM reads 3.5 M, reverse leads, open. Reverse again and open. Discharge cap and the process repeats.

No alarm annunciated on the control board.

Any thoughts?

Thanks.

Please be a bit more specific, what you got for voltage on the load side,
and how you measured it.

Do you have a farad scale, on your VOM?

Christopher A. Young
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"carpboy" wrote in message
...
Carrier appx. 4 ton, 10 years old.

Contactor pulls in, voltage ok on the load side, zero current. Didn't check
at the moment of closing but w/in 10 seconds. No sound whatsoever of
compressor-like noises.

Start windings @ 2.8 ohm, run winding @ 0.7 ohm, start-run @ 3.3 ohms.

Removed cap wires, discharged, DVM reads 3.5 M, reverse leads, open. Reverse
again and open. Discharge cap and the process repeats.

No alarm annunciated on the control board.

Any thoughts?

Thanks.

carpboy wrote:
Carrier appx. 4 ton, 10 years old.

Contactor pulls in, voltage ok on the load side, zero current. Didn't check at the moment of closing but w/in 10 seconds. No sound whatsoever of compressor-like noises.


Hi,
Zero current? Then it indicates open circuit like open winding.
No burnt smell, no spark from the contactor contacts?

On Mon, 11 Jun 2012 08:19:35 -0700 (PDT), carpboy
wrote:

Any thoughts?

Thanks.

Does the outside disconnect have a pair of fuses?

On 6/11/2012 12:10 PM, Stormin Mormon wrote:
Please be a bit more specific, what you got for voltage on the load side,
and how you measured it.


In particular, did the OP measure line-to-line and get 240V.

Or measure line-to-ground and get 120V on each side. You can get this
measurement with one side open (for instance a blown fuse).

--
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