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Personally I can tell you I was impressed with the Daikin VRF system we were involved with. Ours was a heat recovery not heat pump and good down to -4F in heating. We are in Ohio and it was down to below zero last year and we were able to keep the building at 72. I did add a makeup air unit...

At the last unit we measure DP accross supply and return to maintain a set DP for the pump VFD.

Oh, we measure the flow thru the barrel by checking the DP, converting to FT head an using a curve to tell what the flow is. I know by what flow's and math what my DP should be for min/max flow

The chiller manufacturer uses a minimum and maximum flow thru the barrel to achieve proper heat transfer. The problem is I have almost no differential pressure thru the barrel. The butterfly valves are just for shut off purposes and not balancing types. Although the manufacturer recomends a...

I have a building that I am getting ready to troubleshoot some issues. I have a Chiller with one loop pump and 2 Air Handler s with 3-way control valves. The pump is a constant speed pump and the piping loop from the chiller to the pumps is relatively short (80-100 feet of 4" total). The...

Hi all, I have two separate systems one heating and one chilled water both are primary-secondary loop systems with VFD guided pumps on the secondary. Both have Differential pressure switches on the end of the loops controlling the speed of the pumps. I have no original engineering data on...