According to Dalhoff, the on-board intelligence of VFDs and ECMs has improved to the point that system engineers and pump manufacturers can optimally meet the needs of either control scheme required: delta-T or delta-P. Delta-T. John Barba, one of Taco’s variable-speed experts, is a proponent of pump or circulator application based on delta-T, the difference between supply and return temperatures. For variable-speed circulators, delta-T relates directly to the amount of British ...

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