Operation; Controlling The Direction Of Rotation; Maintenance - Wilo NR 4 Series Installation And Operating Instructions Manual

NR series 4-6-8 Stainless Submersibles
ATTENTION! A faulty electrical connection will result in damage to the motor.

6. Operation

6.1 Controlling the direction of rotation:

To determine the correct direction of rotation for the pump, only the shutoff pressure at
the well head needs to be checked, taking into account that the correct motor direction
of rotation generates the greater pressure.

To rectify an incorrect direction of rotation swap any two phases in the switchbox or
motor protection switch. See motor manufacturer's documentation for more
information.
6.2 Operation
ATTENTION! The pump must never run while dry, not even for brief periods.
ATTENTION! Please note that not respecting this information may lead to premature

7 Maintenance

Before carrying out any maintenance work, switch off the pump and ensure
that it cannot be switched on again by unauthorized people. Never carry out
work on a running pump.
 No special maintenance is required during normal operation.
7.1 Spare parts
Please contact Wilo Customer Service directly for spare parts, standard replacements
or repairs to the hydraulic pump parts.
WILO – USA, LLC & WILO Canada Inc. • 2915 10th Ave • Calgary, Alberta CAN • Tel. (403) 276-9456 • Fax (403) 277-9456
motor failure and or reduced life expectancy!