General Preparations And Checking - Wilo Economy Notice De Montage Et De Mise En Service

English
DANGER! Risk of fatal injury!
As a protective measure against dangerous con-
tact voltages:
• If the DEA is without a frequency converter, a
residual-current-operated protection switch
(FI switch) with a trigger current of 30 mA or
• If the DEA is with a frequency converter, a uni-
versal-current-sensitive residual-current-
operated protection switch with a trigger cur-
rent of 300 mA must be installed.
• The protection class of the system and of the indi-
vidual components are indicated by the type
plates and/or data sheets,
• Further measures/settings, etc. are described in
the installation and operating instructions and
also the wiring diagram of the control unit.
8 Commissioning/decommissioning
We recommend that Wilo's after-sales service ini-
tially commissions the system. Contact your
dealer, the nearest WILO representative or contact
our central customer service department directly
for details.

8.1 General preparations and checking

Before switching the system on for the first time:
• Check that onsite wiring has been done correctly,
particularly the earthing
• Check that the pipe joints are stress-free,
• Fill the system and check visually for leakage,
• Open the check valves on the pumps and in the
suction line and pressure pipe,
• Open the pump vent screws and slowly fill the
pumps with water so that the air can escape com-
pletely.
CAUTION! Risk of damage!
Do not allow the pump to run dry. Dry-running
destroys the axial face seal (MVI(E), Helix V(E))
or leads to motor overload (MVIS(E)).
• In suction mode (i.e. negative level difference
between break tank and pumps), the pump and
the suction line must be filled via the opening in
the vent screw (use a funnel as required).
• Check the diaphragm pressure vessel to make
sure that the supply pressure is correct (see
Fig. 2b). To do this, depressurise the tank on
the water side (close the flow-through fixture
(A, Fig. 2b) and allow the residual water to drain
(B, Fig. 2b). Now check the gas pressure at the
air valve (top, remove protective cap) of the
diaphragm pressure vessel using an air pressure
gauge (C, Fig. 2b). If necessary, correct the pres-
sure if it is too low. (P
sure p less 0.2-0.5 bar or the value according to
min
the table on the tank (see also Fig. 3)) by topping
up with nitrogen (WILO after-sales service). If the
pressure is too high, discharge nitrogen at the
valve until the required value is reached. Then
replace the protective cap, close the drain valve on
the flow-through fixture and open the flow-
through fixture.
30
= pump switch-on pres-
N2
• With system pressures > PN16, observe the man-
ufacturer's filling instructions according to the
installation and operating instructions for the dia-
phragm pressure vessel,
• In the case of an indirect connection, check that
the water level in the break tank is adequate, or
with a direct connection, that the inlet pressure is
adequate (minimum inlet pressure 1 bar),
• Correct installation of the proper dry-running
protection system (section 7.2.4.),
• In the break tank, position the float switch or elec-
trodes for the protection against low water level
so that the DEA is switched off at minimum water
level (section 7.2.4),
• Rotation direction monitoring of pumps with a
standard motor (without integrated frequency
converter): Switch on briefly and verify that the
direction of rotation of the pumps (Helix V, MVI or
MHI) corresponds to the arrow on the pump hous-
ing. In the case of type MVIS pumps, the correct
direction of rotation is signalled by the operating
lamp in the terminal box lighting up. Change over
2 phases if the direction of rotation is incorrect.
DANGER! Risk of fatal injury!
Switch off the system's main switch before
changing over the phases.
• Check the motor protection switch in the control
unit to make sure that the correct nominal current
is set according to the specifications on the motor
type plate.
• The pumps should only run against the closed gate
valve on the pressure side briefly.
• Check and set the operating parameters required
on the control unit according to the attached
installation and operating instructions.
8.2 Protection against low water level (WMS)
The protection against low water level (WMS)
(Fig. 4) for monitoring the supply pressure is per-
manently factory-set to 1 bar (switched off if
below) and 1.3 bar (switched on again if above).
8.3 Commissioning the system
After all the preparations and checks according to
section 8.1 have been made, switch on the main
switch and set the control system to automatic
mode. The pressure sensor measures the pressure
at hand and transmits a corresponding current
signal to the control unit. If the pressure is less
than the set switch-on pressure, depending on
the parameter settings and the type of control, it
first switches on the base load pump and, as
required, the peak load pump (s) until the con-
sumer pipes are filled with water and the set pres-
sure has built up.
WARNING! Health hazard!
If the system has not been flushed up to now,
flush it well now at the latest.
(see section 7.2.3.)
WILO SE 07/2010