Starting The Pump; Vent The Piping System; Speed Selection - Grundfos UP XL Série Notice D'installation Et De Fonctionnement

6. Starting the pump

6.1 Vent the piping system

After the pump has been installed and the
electrical connections made, the piping system
must be vented.
Never operate the pump dry - the
system must first be filled with liquid
Caution
and vented.
NOTE: Do not vent the piping system through
the pump. Instead, follow these steps:
1. Fill and pressurize the system with liquid,
and vent all trapped air from the piping by
suitable means.
2. If any isolation valves are used, make sure
they are OPEN.
Warning
If the vent screw/plug is to be
loosened, care should be taken to
ensure that the escaping scalding hot
liquid does not cause personal injury
or damage to components.
3. Vent the pump by removing the vent plug.
When water exists through the port, the
pump is fully vented / primed.
4. Reinstall the vent plug.
Fig. 8 Vent screw/plug removal for pump
venting
12
Inspection screw/

6.2 Speed selection

UPS models
Speeds can be changed via the speed switch on
the terminal box cover. Power must be turned off
before changing speeds. The speed in the three
positions appears in the following table; also see
fig. 10.
UP models
Speed is fixed on Speed 3 (High) and cover
does not have a switch (cover is solid).
Fig. 9 Terminal box cover with speed
switch in medium speed (Speed 2)
Switch position
Low (Speed 1)
Medium (Speed 2)
High (Speed 3)
Changing to lower speeds offers considerable
reduction in energy consumption and less noise
in the system.
Low
Medium
H H
Q
H = Head and Q = Flow
Fig. 10 Pump performance at speed
settings
Speed in % of max.
speed
approx. 60 %
approx. 80 %
100 %
High
H
Q Q