Wilo Helix V 10 Installation And Operating Instructions Manual Download Page 13

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8.2 Starting up

CAUTION!
The pump must not operate at zero flow (closed dis-
charge valve).

WARNING! Risk of injury!
When the pump runs, coupling guards must be in place,
tightened with all appropriate screws.

WARNING! I 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 …).

9. Maintenance - Service

All servicing should be performed by an authorized

service representative!
WARNING! Electrical shock hazard!
Dangers caused by electrical energy must be excluded.
All electrical work must be performed after the electrical
supply has been switched off and secured against unau-
thorized switching.

WARNING! Risk of scalding!
At high water temperatures and system pressure close
isolating valves before and after the pump.
First, allow pump to cool down.

- These pumps are low maintenance. A regular check is

recommended every 15,000 hours.

- In option, mechanical seal could be easily replace on

some models thanks to its cartridge seal design. Insert
its adjusting wedge in its housing (Fig. 6) once mechani-
cal seal position is set.

- Always keep the pump perfectly clean.
- Pumps which are not being used during periods of frost

should be drained to avoid damage: Close the guard
valves, open completely the drain-priming plug and the
air bleed screw.

- Service life: 10 years depending on the operating con-

ditions and whether all requirements described in the
operation manual have been met.

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).
-  Re-tighten 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 completely (2).
- Start the pump and check if direction of rotation match-

es the one printed on pump plating.

If this is not the

case, interchange two phases in the terminal box.

CAUTION!
A wrong direction of rotation will cause bad pump perfor-
mances 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 match-

es the one printed on pump plating. If this is not the
case, interchange two phases in the terminal box.

CAUTION!
A wrong direction of rotation will cause bad pump per-
formances and possibly coupling damage.

- Open the guard valve on the discharge side a little (3).
- Unscrew the air bleed screw from filling plug for air

venting (6a).

- Re-tighten the air-bleed screw when air escapes at the

air bleed screw and the pumped liquid flows.

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 discharge side completely

(3).

- Close the drain-priming plug (5a).