10Pressure Reducer (Accessory); Electrical Connection; Commissioning/Decommissioning; General Preparations And Control Measures - Wilo Comfort Co R-Mvi Serie Manual Del Usuario

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7.2.10 Pressure reducer (accessory)
The use of a pressure reducer is necessary if the
pressure fluctuations in the inlet pipe are greater
than 1 bar or if the supply pressure fluctuations
are 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 the system
pump curve) exceeds the rated pressure. The
pressure reducer 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 delivery 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! Risk of fatal injury!
The electrical connection must be established
according to local regulations (in Germany: VDE
regulations) by an electrical installation engi-
neer approved by the local energy supply com-
pany.
Pressure boosting systems in the Wilo-Comfort
series are equipped with control devices in the CC,
CC-FC or CCe series. To make the electrical con-
nection, the corresponding installation and oper-
ating instructions and attached electrical wiring
diagrams must be observed. General points to be
considered are listed in the following:
• the current type and voltage of the mains connec-
tion must comply with the details on the rating
plate and circuit diagram of the control device,
• the electrical connection pipe must be adequately
dimensioned for the total power of the pressure
boosting system (see rating plate and data sheet),
• external fuse protection must be provided
according to DIN 57100/VDE0100 Part 430 and
Part 523 (see data sheet and wiring diagrams),
• as a protective measure, the pressure boosting
system must be earthed according to regulations
(i.e. according to the local regulations and circum-
stances); the connections intended for this pur-
pose are identified (see also the circuit diagram).
DANGER! Risk of fatal injury!
As a protective measure against dangerous con-
tact voltages:
• For pressure boosting systems without a fre-
quency converter (CC), a residual-current
device (FI switch) with a trigger current
of 30 mA must be installed.
• For pressure boosting systems fitted with a fre-
quency converter (CC-FC or CCe), a universal-
current-sensitive residual-current device with a
trigger current of 300 mA must be installed.
• The protection class of the system and of the
individual components can be taken from the
rating plates and/or data sheets.
• Further measures/settings, etc. are described in
the installation and operating instructions and
also the circuit diagram of the control device.
18

8 Commissioning/decommissioning

Recommendation: We recommend that the initial
commissioning of the system is performed by the
Wilo customer service department. Contact your
dealer, your nearest Wilo representative or con-
tact the central Wilo customer service department
directly to arrange this.

8.1 General preparations and control measures

• Check that all on-site wiring has been performed
correctly, in particular the earthing, prior to the
initial start-up.
• Check that the pipe adaptors are not under stress.
• Fill the system and subject it to a visual inspection
for leakages.
• Open the shut-off devices at the pumps and in the
suction and pressure pipe.
• Open the pump venting screws and fill the pumps
slowly with water to allow the air to escape com-
pletely.
Caution! Risk of material damage!
Do not allow the pump to run dry. Dry running
destroys the mechanical seal and leads to motor
overloading.
• 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 venting screw (use a funnel as required).
• If a diaphragm pressure vessel (optional or acces-
sory) is installed, check that it is set to the correct
supply pressure (see Fig. 3 and 4).
• To do so:
• depressurise the vessel on the water side (close
the flow-through fixture (Fig. 3, A) and allow
the residual water to drain (Fig. 3, B)), and
• check the gas pressure at the air valve (top;
remove dust cap) of the diaphragm pressure
vessel with an air pressure gauge (Fig. 3, C). If
necessary, correct the pressure if too low [(PN 2
= pump switch-on pressure Pmin less 0.2 –
0.5 bar) or value given in the table on the vessel
(see also Fig. 3)] by adding nitrogen (contact
Wilo customer service).
• if the pressure is too high, release nitrogen from
the valve until the required value is reached,
• reapply the dust cap,
• close the drain valve on the flow-through fix-
ture and open the flow-through fixture.
• In the event of system pressures > PN 16, the
manufacturer's filling instructions should be
observed for the diaphragm pressure vessel in
accordance with the installation and operating
instructions.
DANGER! Risk of fatal injury!
Excessive supply pressure (nitrogen) in the dia-
phragm pressure vessel can lead to damage or
destruction of the tank and can thereby also
cause personal injury.
The safety measures for handling pressurised
vessels and technical gases must be observed.
The pressure specifications in this documenta-
tion (Fig. 4) are given in bar (!).
WILO SE 07/2017