Pentair EQ SERIES User Manual download pdf (Page 14)

EQ Series Pump Installation and User’s Guide

Electrical Requirements and Field Wiring, cont’d.

CAUTION — Some single-phase pumps may contain an internal thermal protector designed to temporarily stop

the pump if the motor exceeds a preset temperature. The pump will automatically restart when the

motor temperature falls to a preset limit. Always disconnect power before working on the pump to

eliminate the possibility that the pump could start unexpectedly.

Three-phase pumps do not contain an internal thermal protector and must be externally protected

by an appropriately sized protective device commonly referred to as a starter. Improper sizing of the

starter can result in the motor being destroyed or in frequent tripping of the starter.

4. It is important that all portions of the electrical circuit including the conductors that connect the electrical panel

to the pump motor are properly sized based on the nameplate information on the pump.

5. Following the National Electrical Code and any local electrical codes connect the grounding conductor and

electrical supply conductors to the motor. Ensure that the pump is properly grounded per the above codes

utilizing the grounding screw identified in the terminal box of the pump motor.

6. It will be necessary to confirm that the rotation of the motor is in the correct direction on all three-phase pump

units and on certain single-phase pump units. Check wiring diagram to determine if motor can be field wired

to rotate in both directions. Checking rotation by energizing the pump for one second and then watching the

rotation through the back of the motor as it coasts to a stop. Ensure that the rotation matches the direction arrow

on the pump. Operating a pump with the incorrect rotation can cause many problems including poor priming,

diminished water flow, excessive noise, overloading of the motor and premature failure of the pump.

CAUTION — Always fill the pump with water before energizing the pump motor. Operating the pump without water

can damage the pump seal within a few seconds.

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Pentair EQ SERIES User Manual Page 14