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www.greenbuildermag.com 08.2012


~ How-to ~ 34 REPLACE A POOL PUMP


When seeking ways to reduce a swimming pool’s energy consumption, the greatest impact can be made by upgrading from a traditional pump to a variable-speed model.


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OOL PUMPS CAN draw 2000 watts and consume 3,000 to 5,000 kWh per year. Replacing a single- speed pump with a variable-speed model can re- duce a pool’s energy consumption by up to 90%,


translating into a reduction of 20% to 40% of a home- owner’s monthly electric bill. Before you begin, check the safety of wiring to the unit, and inspect the equipment pad for leaks and other safety issues. This guide is meant as an overview of the replacement process. You’ll need to refer to the manufacturer’s docu- mentation to do the job safely and correctly.


Time to go. Old, single-speed pool pumps like this relic have outlived their usefulness. Newer models adjust to fl ow as needed, and waste far less electricity.


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Calculate pool volume. Multiply the pool’s length times width times average depth. Pools with complex geometry (online calculator available at www.pentairpool.com). Multiply volume times 7.48 to get the number of gallons in the pool. A residential pool’s volume should turn over once every 24 hours.


Measure existing pump dimensions. In particular: (A) total pump length, (B) distance from the center of the discharge port to the face of the suction fi tting, and (C) height from the ground to the center of the suction fi tting. Confi rm that the new pump will fi t with adequate ventilation. Remove the existing pump.


Install the new pump. Place the pump on the pad, thread pipe into the new pump’s fi ttings, glue pipe and reinstall electrical wires. Evacuate air from the system using the fi lter’s air relief valve. This should be done immediately upon starting the new pump. Air will enter the plumbing during the pump replacement procedure. If not released, it’s a safety hazard.


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