Wilo Helix EXCEL 22 Série Notice De Montage Et De Mise En Service page 42

English
8. Start up
8.1 System filling - Venting
CAUTION! Possible damage of the pump!
Never operate the pump dry.
The system must be filled before starting the
pump.
8.1.1 Air evacuation process – Pump with sufficient
supply pressure (Fig. 3)
- Close the two guard valves (2, 3).
- Unscrew the air bleed screw from filling plug (6a).
- Slowly open the guard valve on the suction side (2).
- Retighten the air-bleed screw when air escapes
at the air bleed screw and the pumped liquid
flows (6a).
WARNING!
When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw
may cause burns or other injuries.
- Open the guard valve on the suction side com-
pletely (2).
- Start the pump and check if direction of rotation
matches the one printed on pump plating.
CAUTION! Possible damage of the pump!
A wrong direction of rotation will cause bad pump
performances and possibly coupling damage.
- Open the guard valve on the discharge side (3).
8.1.2 Air evacuation process – Pump in suction
(Fig. 2)
- Close the guard valve on the discharge side (3).
Open the guard valve on the suction side (2).
- Remove the filling plug (6b).
- Open the drain-priming plug not completely (5b).
- Fill the pump and the suction pipe with water.
- Make sure that there is no air in the pump and in
the suction pipe: refilling until complete removal
of air is required.
- Close the filling plug with air bleed screw (6b).
- Start the pump and check if direction of rotation
matches the one printed on pump plating.
CAUTION! Possible damage of the pump!
A wrong direction of rotation will cause bad
pump performances and possibly coupling dam-
age.
- Open the guard valve on the discharge side a lit-
tle (3).
- Unscrew the air bleed screw from filling plug for
air venting (6a).
- Retighten the air-bleed screw when air escapes
at the air bleed screw and the pumped liquid
flows.
WARNING! Risk of burning!
When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw
may cause burns or other injuries.
- Open the guard valve on the discharge side com-
pletely (3).
- Close the drain-priming plug (5a).
42
8.2 Starting up
CAUTION! Possible damage of the pump!
The pump must not operate at zero flow (closed
discharge valve).
WARNING! Risk of injury!
When the pump runs, coupling guards must be in
place, tightened with all appropriate screws.
WARNING! Important noise!
Noise emitted by most powerful pumps could be
very high : protection must be used in case of long
stay close to the pump.
WARNING!
Installation must be designed in order that no one
could be hurt in case of fluid leakage (mechanical
seal failure ...).
WILO SE 03/2013