Re: A/C Compressor coil burnt up?
- From: Sam Goldwasser <sam@xxxxxxxxxxxxxxxxxx>
- Date: 14 Jun 2005 20:34:48 -0400
S, R, and C should all be low ohms.
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gado <gado.1qn0xr@xxxxxxxxxxxxxxxxxx> writes:
> The outside A/C condensor unit (Trane TTJ type) of my home has a
> CSR-type compressor. It has two phase 120VAC fed to it. When the
> thermostat calls for cooling, the fan runs but not the compressor, even
> after it has rested for 24 hours. The A/C ran last summer. I just bought
> the house last year so I don't know the history of the unit or its
> maintenance.
>
> There is a run capacitor across the S and R terminals of the
> compressor. No start capacitor. This is a permanent split capacitor
> type hookup where both run capacitor and start winding stay in the
> circuit during start and after the motor is up to speed...
>
> The resistance between the C and R terminals is 2 ohms. The resistance
> across the S - R terminals (and the run cap) is between 1-4 megohms. I
> take it this means my run cap is not shorted. Based on the high
> resistance, is the S terminal open or the start coil burned up? If the
> start coil is burned up, is there any way to start the motor using the
> run coil and some external whizardry?
>
> See figure 4-13 of http://www.tpc-nacg.com/servicehandbook.pdf where
> the start winding has a series resistor...maybe its in case the run
> capacitor shorts it would cause the thermal protector to trip...
> protecting the start coil? The C terminal has an internal thermal
> overload to protect the run coil.
>
> There is no (apparant to me) low-pressure cutoff switch on the unit.
>
> I took the cap off the freon return line and pressed the valve, there
> is at least some freon in the system but I don't have gauges to see how
> much pressure.
.
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