Copleand UltraTech

[man from trane]

How does the Copeland Scroll UltraTech compressor work? Is it mechanically modulating, muliple speed, or variable speed? I'm told the turndown is 67% but that doesn't seem like much. Any info would be appreciated as I couldn't find much on the net for specifics.

[dash]

Picture the scroll of a single stage unt,gas enters at the outer edge of the scroll.

Now picture a bypass soleniod inside the compressor,that when open allows the gas to enter the scroll,about a third of the way from the edge of the scroll.That's how low stage works and capacity is around 67% of high.

Solenoid is energized to go to high stage.

[man from trane]

So if that hermetically sealed solenoid valve dies or gets stuck, you're screwed, right?

[dash]

True and it would be stuck in low speed.


It is a DC solenoid and Copeland feels failures will not be an issue.
We have 4 of them that have been installed for a little over thre years with no problems ,time will tell.

[man from trane]

Thanks for the info. Very helpful.

[jpmkam]

Saw this web page with some information on it.

http://www.copeland-corp.com/cp_ac/cp_ac_1_1_4_.htm#3