On Jul 19, 7:50*am, "hr(bob) "
wrote:
On Jul 19, 9:00*am, Robert Macy wrote:





On Jul 18, 4:54*pm, wrote:

Last year the central AC went down. Compressor wouldn't atart and I was in the "oh ****" mode. However I found that the run capacitor was bad and it is up and running fine for about twenty bucks from the local W.W. Grainger. A simple dual AC 440 volt capacitor, not a compressor. Plus it's an R22 system which compicates matters even further. I would have had to convert to R134 or wait months for a compatible condensing unit.

Anyway now that the heat is on here again, the electric bill is not as high as last year it seems. Now I know capacitors don't all go all at once and I wonder now if decreased capacitance or high ESR might have been adversely affecting the unit's efficiency.

These motors are of course synchronous or whatever so they are going to do 1,750 or 3,450 RPM or whatever, so if less efficient then it would stand to reason that they would be pulling more current than they should.

How much can that weak capacitor cost you in energy ? This is not a start capacitor, it is a run capacitor. Would it be worth it, in these days of ever increasing energy costs to go out and actually check these capacitors and change them when they get marginal ?

J

I also have 3 zones of R22 A/C's. *What brand is yours? *Someone
'diddled' with the valve on zone 3 and f$500 worth of R22 [9.5 lb.]
went into the atmosphere. *To replace unit to 'more efficient and
environmentally friendly' is at least $1700 *arrrgggg!

Without freon the unit would not run. Repair people [from their
office] said probably capacitor, because it's the first thing to go
out. *Hmmm.

When the guy came out he checked pressure on the working units, and
verified lack of freon prevented zone 3 form operating, but I never
saw him check the capacitors! *Since a bad capacitor can impact
efficiency and is always the first thing to go, I'm surprised it's not
one of the first items to check. *Any thoughts?

If the system has a relay that opens the circuit to the compressor
when the pressure is low, the tech might have made the correct first
move.

I was referring to the GOOD units. Why weren't the caps checked in any
manner on those units.