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Posted by Noon-Air on May 29, 2007, 8:24 am
The system is jurassic mix/match.... Its paid its dues, replace it. They
don't last forever. Don't forget to replace the duct system so that it
matches the new high efficiency system.
>I know I'm not providing all the necessary info, but here goes. I
> have a Carrier residential outdoor unit that is 20 years or so, has
> worked well until this season. It is about 3.5 tons. I can post the
> model number for it, as well as model number on the compressor later
> today, I'm currently at work. The compressor runs, but it seems to be
> much quieter, so it is running low. I measured 110V from the yellow-
> blue and 110V from the black-blue terminals, so it is getting
> voltage. I have a Fluke amp clamp, but didn't think to take the
> current draw, will do that tonight. I can hear some whistling through
> the expansion coil, there is some minor circulation going on. The
> coil is an A-type and was original to the house (1960). It has an old
> style expansion valve on it (no orifice). The unit always had
> problems starting against the closed valve (against the hi head
> pressure I guess they call it) and about 7 years ago I installed a
> delay timer which I set at 20 minutes, butit would still have problems
> starting sot I also installed a supco spp6 which seemed to correct the
> problem. No issues until this season.
>
> Where should I start? I can measure the coil resistances (yellow-blue
> and black-blue) and the amp draw on each leg if that info is useful.
> I also have this capacitor tester which goes up to 200uF:
> http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=390-570.
>
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