archibaldtuttle
18-06-2008, 04:20 PM
after serious consdieration of adding this at the bottom of the scroll vs. semi thread I decided it deserved its own.
I spent some time on the phone with copeland today in advance of installing a standard scroll and by the time I got done explaining my variant load characteristics they had convinced me I really should have bought a digital scroll.
Has anyone installed one of these and what is the 3 year out service/failure rate for this new technology. Sounds like a silver bullet but maybe it is just a lead ballon. One thing I can't find in copeland's literature is what parameters they monitor to actually set the percentage of compression time - which I understand cycles 3 times a minute, e.g. breaks down into 20 second increments and separates the scrolls for 2 second per 5% reduced capcity desired down to 10%, i.e. 2 sec. on 18 seconds off.
I still am an advocate for a better proportional electric controller to recognize load changes, proportionally modulate chiller delivery temps. compared to outdoor temps and dew point, and set desirable cycle lengths (although the latter might be moot with the digital technology which is designed almost as constanct run). But I'm interested in the digital scroll since my nirvana electric controller doesn't appear to exist at this point.
let it fly.
brian
I spent some time on the phone with copeland today in advance of installing a standard scroll and by the time I got done explaining my variant load characteristics they had convinced me I really should have bought a digital scroll.
Has anyone installed one of these and what is the 3 year out service/failure rate for this new technology. Sounds like a silver bullet but maybe it is just a lead ballon. One thing I can't find in copeland's literature is what parameters they monitor to actually set the percentage of compression time - which I understand cycles 3 times a minute, e.g. breaks down into 20 second increments and separates the scrolls for 2 second per 5% reduced capcity desired down to 10%, i.e. 2 sec. on 18 seconds off.
I still am an advocate for a better proportional electric controller to recognize load changes, proportionally modulate chiller delivery temps. compared to outdoor temps and dew point, and set desirable cycle lengths (although the latter might be moot with the digital technology which is designed almost as constanct run). But I'm interested in the digital scroll since my nirvana electric controller doesn't appear to exist at this point.
let it fly.
brian