Dual Run Cap & Data plate unreadable. Can manufacturer help, given other equip specs?

yuri said:

There should be a model # and name on top of the compressor. Get that and google it and you can get the tonnage. If you can find the info from Copeland it should give you the cap size. Maybe Miller can help with that info.

You could accidentally go larger and it will give it more horsepower. We have universal fan motors that can use a 5/7.5 or 10 mfd cap and give you .25 or.33 or .5 hp with the same motor. Not recommended to go higher but it is not lethal from what I know. Too small will definitely overheat it. You can use a 440 VAC on a 370 cap but not the other way around.

Click to expand...

yuri said:

Technically AC compressors are rated in horsepower and there is a conversion etc. Larger refrigeration systems are rated in horsepower and if you look at the market Copeland etc makes compressors for, resi is probably 10%. Sounds confusing but it explains why compressors are not exact BTU rated. Ie 24/30/36,000 BTUs. The manufacturers pick something close and Bob's yer uncle.

Usually the compressor is within 2,000 BTUs of what the system is rated at.

Air compressors are rated in horsepower too.

Click to expand...

justplumducky said:

Older mobile home High Efficiency Miller Package Unit. Dual Run Cap & Data plate unreadable. Can manufacturer help, given other equip specs: tonnage if legible on top of the R-22-type compressor; condenser fan motor, and blower motor.

Other similar units have never been less than 35/5 uf for the dual run. Blower: 7.5 uf. I'm guessing that guessing could possibly do damage if the manuf's specs were higher?

Click to expand...

yuri said:

I tend to live in 3 worlds.

Resi up to 5 ton which I started in and am back in for awhile.

Commercial rooftop units and refrigeration which I did for awhile.

Huge steam boilers, large air compressors and up to 1000 ton centrifugal chillers in big bldgs I worked in.

Once you get into power plants, high pressure ( over 15 psi ) steam power plants (hospitals, convention centres, hi-rise commercial bldgs) everything is rated in horsepower/ Boilers, air compressors.

The reason being in order to legally operate a 2nd class power plant in Canada you cannot have over 1000 accumulated horsepower of boilers and air compressors combined. After that it is a 1st class power plant and you need more expensive operating/Power Engineers.

When you look at a wholesalers manual for compressors they are rated in horsepower as well as cross referencing the existing one you have. Just messing with you Duck as this may be way over your head and is just trivia.:biggrin2:

Click to expand...

justplumducky said:

:vs_mad: And just when I was startin' to understand your first comment(s). Someone also please keep Yuri out of the room for a while :devil3:

Click to expand...

beenthere said:

Thats it. Were taking your P/T charts away from you for a week young man. :surprise::biggrin2:

Click to expand...