Tech question about variable speed compressors...

Bob Sisson · 2007-05-31T16:57:57+00:00

This is an extension of my question a while back out variable speed compressors.(Does anyone make a residential variable speed compressor in the 4 tonn range)(Not 2-speed or multi-compressor, true multi-speed like some of the ductless, or commercial)How does the expansion valve deal with variable liquid flow rates? I would thing that at one flow you would get good expansion, but at too higher or lower you might have problems. How do the commercial units deal with the change if flow rates through the expansion valves, as I thought the expansion valves were tied to the flow, which would be tied to the compressor....I know that several manufactures make a big deal about their expansion "metering" values and was wondering how they fit into the grand scheme of the system.Bob

May 31, 2007 22 Replies

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Bob Sisson 19 years ago

Who ever wrote that most of this list is above the A.R.T. is right.

I consider myself am educated consumer... I ask lots of questions... and lots of people don't like that.

When the were going to install our last system, I asked that they purge the lines and then draw a hard vacuum for a long period.

Well, when they went to instal it, they had a vacuum pump, but no purge gas, and no vacuum gauge... they didn't appreciate when I asked where those were...

Yes I am a cheep ZOT, but I am willing to pay for quality, and it is %#$@! hard to find.

Bob

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Noon-Air 19 years ago

You shouldn't have had to ask.

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gerry 19 years ago

Actually Controller Area Network (CAN) (now required on new autos) was designed by BOSCH is very well suited for autos and industrial control. It is far more rugged than Ethernet.

formatting link

{ Controller Area Network (CAN)

Is a high-integrity serial data communications bus for real-time applications

Operates at data rates of up to 1 Megabits per second
Has excellent error detection and confinement capabilities

Was originally developed by Bosch for use in cars
Is now being used in many other industrial automation and control applications

Is an international standard: ISO 11898 }

gerry

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