Maintenance - Service - Wilo Helix-V 2 Notice De Montage Et De Mise En Service

English
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!
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!
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).
8.2 Starting up
CAUTION!
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 ...).
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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 unauthorized 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 maintenance free.
- 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 mechanical 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.
WILO SE 09/2011