Assembly; Hydraulic Connection - Wilo NR 4 Series Installation And Operating Instructions Manual

NR series 4-6-8 Stainless Submersibles
ATTENTION! The maximum flows must be respected. Beyond maximum there is
Type of pump
NR 6-12..
NR 6-18..
NR 6-24..
NR 6-35..
NR 6-45..
NR 8-42..
NR 8-80..
NR 8-100..
NR 10-170..
NR 10-250..

5.1 Assembly


The bore-holes or pump stations must be created/arranged in accordance with the
generally applicable technical rules.

Please ensure that the flow of water in the bore-hole or well is sufficient for the
capacity of the pump.

The pump is carefully lowered using a double-purchase pulley on the suspension
rope and tripod/crane, heavy pumps using a rope winch.

Ensure that the pump never runs dry and make sure that even in dry periods the
water level never falls below the pump's check valve (uppermost position).
ATTENTION! In the case of installation in a deep well (well shaft diameter greater than
a bore-hole), a reservoir, horizontal installation or in a deep well, a
cooling-shroud (accessory) must be fitted to the unit to ensure the motor
is properly cooled (fig. 2, pos. A).
 It must be ensured that the well shaft in the bore-hole has a constant internal
diameter to allow the pump to be lowered freely for the entire depth of the shaft.
 Never raise or lower the pump by the electric cable.
 The electrical connection and extension of the motor cable must take place before
the pump is lowered and be tested/measured to ensure they are working.

The final installation position must be guaranteed such that the pump sits at least 1
foot above the bottom of the bore-hole or well (fig. 1).

The rating plate must be affixed in the immediate vicinity of the well head to allow
access at all times to the unit's technical data.

Before lowering (and while lowering in deep bore-holes) the insulation resistance of
the motor and cable must be measured several times (min. 2 M).
5.2 Hydraulic connections (see fig. 1)
 Connections to steel threaded pipes: 2" or 2 ½" , 3", 4" , 5", 6" depending on size of
pump.
If flexible pipework is used, the pump must be held by a chain/steel cable. The two
steel loops on the pump head are to be used for this.
WILO – USA, LLC & WILO Canada Inc. • 2915 10th Ave • Calgary, Alberta CAN • Tel. (403) 276-9456 • Fax (403) 277-9456
risk of damage to the motor.
max. flow gpm
70
114
154
216
348
286
506
598
1056
1320