Soft Start for Scroll Compressors

Good answer!

That's one question I can't answer for sure, my experience would indicate that that would be a possibility. If you're dealing with multiple machines a more economical and potentially more practical solution would be to link them through a logic controller.

Their cheap relatively easy to program and would be highly effective in reducing peak demand. You could easily program a time delay to prevent machines from starting simultaneously. Obviously this would substantially reduce peak demand.

Additionally they could easily be programmed for load shedding, for example preventing one machine from starting until the temperature has been satisfied in another zone. Of course there be slightly more temperature variations but usually this can be held to an acceptable level.

I thougt a scroll compressor uses a lot less starting current than a piston type?

The Last One I was involved with came with soft starts on both compressors included in the package. It was a McQuay chiller. The only problem it gave us was the self destruct caused by fan blades breaking and flying through the condenser. I figure there's a hole in the ozone layer over West Virginia that should be named " The McQuay Hole".

I believe you could learn a lot of valuable info from the following link. It is an in depth study of energy consumption and savings for commercial Hvac systems. They cover stem to stern in this lengthly pdf file such as; savings, peak usage and etc.

Click Here.

Energy Consumption Characteristics of

Commercial Building HVAC Systems

Volume III: Energy Savings Potential

It was put out by TIAX LLC a few years back with the help of the following experts;

J. Brodrick (DOE)

L. Burgett (Trane)

K. Hickman (York)

G. Hourahan (ARI)

B. Hunn (ASHRAE)

S. Nadel (ACEEE)

C. Nasseri (DOE)

_{Wishing you the best.}

Hi Guys .

There was a misunderstanding or a bad explanation from my side . I was talking about costs savings more then energy saving . Reducing the peaks on fans and compressors starting will reduce the power peaks and that result you can look it on the Bill .

That what I was trying to say .

I'm Right ??????

You're right to some degree. Most peak readings that are used on the bill are computed on a 15 minute window, which averages a good bit of the sudden peaks that only last a few seconds. A lot depends on what percentage of total load is made up by the device you are wondering about, and how often this device starts during a normal day. It does make a difference on equipment life, including the distribution system. Sorry if this muddies the water even more.