Wilo COR-1HELIX VE5203/3/VR, Installation And Operating Instructions Manual

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English
30 WILO SE 07/2010
7.2.10 Pressure reducer (accessory)
The use of a pressure reducer is necessary with
pressure fluctuations in the inlet pipe of more
than 1 bar or if the supply pressure fluctuation is
so great that the system has to be switched off or
the total pressure (supply pressure and pump head
at the zero volume point - see characteristic
curve) of the system exceeds the nominal pres-
sure. The pressure relief valve can only perform its
function if there is a minimum pressure gradient of
approx. 5 m or 0.5 bar. The pressure downstream
of the pressure reducer (back-pressure) is the
basis for the total head calculation of the pressure
boosting system. When installing a pressure
reducer, there should be an installation section of
approximately 600 mm on the supply pressure
side.
7.3 Electrical connection
DANGER!
The electrical connection must be made accord-
ing to the local regulations (VDE regulations) by
an electrical installation engineer approved by
local electricity supply companies.
The system can be equipped with different types
of control device. To make the electrical connec-
tion, the corresponding installation and operating
instructions and attached electrical wiring dia-
grams must be observed. General points to be
considered are listed below:
• The current type and voltage of the mains con-
nection must comply with the details on the rating
plate and wiring diagram of the control device.
• The electrical connection line must be adequately
dimensioned according to the total power of the
system (see rating plate and data sheet).
• External protection must be provided according
to DIN 57100/VDE 0100 part 430 and part 523
(see data sheet and wiring diagrams).
• As a protective measure, the system must be
earthed according to regulation (i.e. according to
the local regulations and circumstances); the con-
nections intended for this purpose are identified
accordingly (see also wiring diagram).
DANGER!
As protective measures against dangerous con-
tact voltages:
• In the case of systems without a frequency con-
verter (CO-1...) a residual-current-operated
protection switch with a trigger current of
30 mA must be installed
• In the case of systems with a frequency con-
verter (COR-1...) a universal-current-sensitive
residual-current-operated protection switch
with a trigger current of 300 mA must be
installed
• The protection class of the system and of the
individual components are indicated by the rat-
ing 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 devices
8 Commissioning/Decommissioning
We recommend that the initial commissioning of
the system is performed by Wilo’s customer serv-
ice. Contact your dealer, your nearest Wilo repre-
sentative or contact our central customer service
department directly for details.
8.1 General preparations and checking
• Before switching on for the first time, check that
all on-site wiring has been done correctly, partic-
ularly the earthing
• Check that the pipe joints are stress-free
• Fill the system and check visually for leakage
• Open the stop valves on the suction and pressure
pipes
• Filling and bleeding the pump: open the pump's
vent screw and slowly fill the pump with water so
that the air can escape completely (see also the
installation and operating instructions for the
pump: section regarding filling)
CAUTION!
Do not allow the pump to run dry. Dry-running
destroys the mechanical shaft 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 pump), the pump and the
suction line must be filled via the opening in the
vent screw (use a funnel as required). (See also the
installation and operating instructions for the
pump: section regarding filling.)
• Check the diaphragm pressure vessel to make sure
that the supply pressure is correct (see Fig. 4). To
do this, depressurise the vessel on the water side
[(close the flow-through fixture (A, Fig. 4) and
allow the residual water to drain (B, Fig. 4)].
• Now check the gas pressure at the air valve (top;
remove protective cap) on the diaphragm pressure
vessel using an air pressure gauge (C, Fig. 4)
• If necessary, correct the pressure if too low [(PN2
= pump switch-on pressure pmin less 0.2-0.5 bar)
or value given in the table on the vessel (see also
Fig. 5)] by adding nitrogen (contact Wilo customer
service). If the pressure is too high, let off nitrogen
at the valve until the value required is reached.
Then replace the protective cap, close the drain-
age valve on the flow-through fixture and open
the flow-through fixture.