Wilo CRONOLINE-IL-E Série Notice De Montage Et De Mise En Service page 90

English
r ≈ 2,5 * (d-2s)
5 x DN
Fig. 21: Settling section before and after
the pump
82
NOTE:
Shut-off devices shall be installed upstream and downstream from
the pump in all cases, in order to avoid having to drain the entire sys-
tem when checking or renewing the pump. A non-return valve shall
be installed on the pressure side of each pump.
NOTE:
A settling section must be provided before and after the pump, in the
form of a straight pipe. The length of this settling section should be at
least 5 x DN of the pump flange (Fig. 21). This measure serves to avoid
flow cavitation.
• The pipes and pump must be free of mechanical stress when installed.
The pipes must be fixed in such a way that the pump is not supporting
the weight of the pipes.
• The direction of flow must correspond with the direction arrow on the
pump housing flange.
• The air vent valve at the lantern (Fig. 6, Item 1.31) always has to be pointed
upwards if the motor shaft is horizontal (Fig. 6). If the motor shaft is vertical,
any orientation is permitted. See also Fig. 18: "Permitted installation posi-
tions with horizontal motor shaft" on page 80 and Fig. 19: "Permitted
installation positions with vertical motor shaft" on page 80.
• All installation positions except for "motor facing down" are allowed.
• The electronic module must not face downwards. If required, the
motor can be turned after loosening the hexagon head screws.
NOTE:
After loosening the hexagon head screws, the differential pressure
sensor is attached to the pressure measuring lines only. When turning
the motor housing, make sure that the pressure measuring lines are not
bent or kinked. Furthermore, while rotating the motor housing, it must
be ensured that the housing O-ring seal does not become damaged.
• For the permitted installation positions, see chapter 7.1 "Permitted
installations position and change of the arrangement of components
before the installation" on page 79.
• The installation position with horizontal motor shaft is only permitted
up to a motor power of 11 kW. A motor support is not necessary.
• Only the installation position with vertical motor shaft is intended for
a motor power >11 kW.
NOTE:
BL-E series monobloc pumps are to be mounted on a sufficiently
strong base or mounting brackets.
WILO SE 12/2017