Tech question about variable speed compressors...

Posted by Noon-Air on June 7, 2007, 7:19 pm

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Ummmm....check out the Copeland 2 stage scroll..... a solonoid shifts the
scroll plates to either run "unloaded" at 60% or "loaded" at 100% of its
rated output.

Posted by Jake on June 7, 2007, 7:25 pm

Noon-Air wrote:
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The Copeland 'Ultratech'... which I think you're referring to... is a
classic unloader. The Digital Scroll takes things a bit further... but
it's still mechanical and I'm not partial to that....
There is no 'linear' control. 60 or 100 percent? Geeze....
Jake

Posted by Noon-Air on June 7, 2007, 7:33 pm

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Its a resi job......the manufacturer makes them, I just install them.

Posted by Jake on June 7, 2007, 8:28 pm

Noon-Air wrote:
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I'm not 'dinging' you, Steve.... But please remember the manufacturers
are not doing right by the consumers here. I don't blame Copeland, either.
The OEM's have a great concern the field techs out here have no ability
to deal with complex electronics like VFD's and digital control.
I just want to know if that's justified, or not..
Jake

Posted by .p.jm on June 7, 2007, 8:49 pm

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        You gotta be kidding me. The Average Residential 'Tech' isn't
qualified to properly level the pad to set a condensor on. The A.R.T.
is concerned about generating enough sales to keep the boss of his
ass, and how many more calls will he have to take today, and what's
the safest way for him to avoid having a call-back ( condeming the
whole system is pretty safe, he figures ).
        The A.R.T. couldn't tell you what a VFD is, has never seen
one, barely knows how to work a computer if at all, wouldn't now a PID
if it jumped up and bit him in the ass, has no clue what a 'control
signal span' is, no clue what a ramp is, no clue what a PLC is, etc
etc.
        Face it - residential work is the dog's ass of the industry -
it's run-your-ass-off in the summer, look-for-make-work-shit-to-do in
the spring and fall, run-your-ass again in the winter, until you're
too old to do it any more.
        The A.R.T. is accustomed to little split systems < 5 ton, has
often never worked on anything larger, that have maybe one small
board, 2 relays, and 2 contactors, in total. Often the A.R.T. is
confused as all hell if he's confronted with so much as a different
brand than the one he usually deals with.
        It's not like the work you do, Jake, with all the training,
testing, supervision, variety, challenges, etc etc. It's all about
'How many calls did you run today ?', 'How many call-backs this month
?', and 'how many new systems did you sell today ?'. That's the
business.
--
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Tech question about variable speed compressors... - Page 4