This week a Michigan engineer contacted me to discuss the conversion of an existing and oversized constant speed secondary chilled water pump to variable speed in order to save energy. He had concerns about the operation on the pump curve at the reduced speed. Like everything we do in retrofit projects, there was limited information. He knew there were two-way valves in the system, but there were also older three-way valves. The client was a health care facility and it is finally hot in Michigan. We could not shut the system down or drive the system to full bypass to check operation at various loads. What concerns should we have?

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