Pipe Connection; Connection Variants - Wilo BAC Einbau- Und Betriebsanleitung

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7.3

Pipe connection

General
r 2,5 · (d · 2s)
5 x DN
Fig. 4: Settling section before and after the
pump

Connection variants

24
WARNING! Risk of fall!
• The pump must be firmly fixed on the ground.
CAUTION! Risk of remaining parts in the pump!
• Remove all cover plugs from the pump housing before installation.
• The pump must be installed in an easily accessible position to facili-
tate inspection or replacement.
• The pumps must be protected from the weather and installed in a
frost/dust-free, well-ventilated atmosphere which is not potentially
explosive. The pump must not be installed outdoors.
• The air access to the motor fan must be free. There must be a mini-
mum distance of 0.3 m between the pump and the wall.
• Pumpe vorzugsweise auf einer glatten Zementoberfläche aufstellen.
• The pump must be fixed with at least two studs of Ø M8 or Ø M10,
depending on the pump.
• The motor is provided with a condensate drain (under the motor). The
drain is plugged in the factory to guarantee the IP55 protection. For
use in air-conditioning or cooling applications, this plug must be
removed to allow the evacuation of the condensate water.
NOTE
If the caps are removed, protection class IP 55 is no longer ensured!
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. 4). This measure serves to avoid
flow cavitation.
There are two standard variants:
1 Pump in suction mode (Fig. 1)
2 Pump in pressure mode (Fig. 2), from storage tank (Fig. 2, Item 9)
or municipal water supply (Fig. 2, Item 10) with dry-running pro-
tection system.
CAUTION! Risk of possible damage of the pump!
Tightening of screws or bolts must not exceed 10daNm. Use of
impact wrench is prohibited.
• The circulation direction of the fluid is indicated on the pump housing.
• The pipes and pump must be free of mechanical stress when installed.
• The pump must be installed in a way that it does not carry the weight
of the pipework.
NOTE
It is recommended that isolation valves are installed on the suction
and pressure side of the pump.
• Use expansion rubbers to reduce noise and vibrations of the pump.
• Provide a suction pipe with a nominal cross-section which is at least
as large as the pump connection.
• A non-return valve can be fitted on the pressure pipe to protect the
pump against fluid hammer.
• For a direct connection to a public drinking water system, the suction
pipe must also have a non-return valve and a guard valve.
WILO SE 11/2013