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Variable Flow Pumps – Control Strategies

Variable Flow Pumps Control Strategies BBT Conference Feb 4/5, 2015. Presented by Steve Thompson VP - Residential Product Management Taco Inc. Mobile (401) 441-2934. E Mail: Variable Flow Pumps Control Strategies Agenda: Introduction General Descriptors VFD or not VFD That is the Question (VFD Assessment Tool). System & Pump Curves Selfsensing Pumps Applications Balancing VFD Pumping Systems Delta T. Warning!!! Efficiency To trim or not to trim ECM Permanent Magnet Technology Affinity Laws Commissioning Tips DOE / ASHRAE / ACEEE. 1. General Descriptors T Differential Temperature Net temperature differential between two points (typically supply and return).

PRIMARY PUMP DIFF. PRESSURE TRANSMITTER CONTROL VALVE BYPASS W/VALVE TERMINAL UNIT PRIMARY PUMP DIFF. PRESSURE TRANSMITTER 80’ setpoint 17’ setpoint Location of ∆P Transmitters Effeciencies are dramatically affected Differential Temperature Delta-T lends itself to even more cost effective variable speed pumping.

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