Protection Against Low Water Level (Wms); Commissioning The System; Decommissioning The System - Wilo Comfort Co R-Mvi Serie Manual Del Usuario

If other units of pressure measurement are used,
always be sure to convert the figures correctly!
• 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 right dry-running pro-
tection (Section 7.2.4.)
• In the break tank, position the float switch or elec-
trodes for protection against low water level so
that the pressure boosting system is switched off
at minimum water level (Section 7.2.4)
• Checking the direction of rotation of pumps with
a standard motor without integrated frequency
converter (Helix V): Switch on briefly to check
whether the direction of rotation of the pump
matches the arrow on the pump housing. Swap
2 phases if the direction of rotation is incorrect.
DANGER! Risk of fatal injuries!
Switch off the system's main switch before
swapping the phases.
• Check the motor protection switch in the control
device to make sure that the correct rated current
is set according to the specifications on the motor
rating plate.
• The pumps should run only briefly against the
closed gate valve on the pressure side.
• Check and set the operating parameters required
on the control device according to the attached
installation and operating instructions.

8.2 Protection against low water level (WMS)

For operation with supply pressure
• System without frequency control (CO – CC)
The pressure switch for the optional protection
against low water level (WMS) kit (Fig. 5a and 5b)
for monitoring the supply pressure is permanently
factory-set to the thresholds 1 bar (deactivates if
pressure below this value) and about 1.3 bar
(reactivates when pressure goes above this value).
It is not possible to change this setting.
• System with frequency control (CO – CC-FC
or CCe)
The pressure sensor installed on the intake side
can also by activated by the control device as a
signal transmitter for protection against low water
level (Fig. 5c) to monitor supply pressure. The
pressure value for switching off and switching
back on can be set to a specific range in the con-
trol device. The system's factory settings are that
the system deactivates when pressure falls below
1.0 bar and reactivates when it exceeds 1.3 bar.
(For more detailed descriptions of the activation
procedure and settings, see the installation and
operating instructions provided for the control
device).
If another pressure switch is used as the low-
water signal transmitter, observe the accompany-
ing description about its configuration options.
The necessary control device settings for this are
to be taken from the installation and operating
instructions provided for the control device.
Installation and operating instructions Wilo-Comfort CO(R) .. MVI ... /.. MVIS ... /.. Helix V ... /.. Helix VE ...
For operation with break tank (inlet mode)
With Wilo break tanks, the level-dependent low
water monitoring is done with a float switch. This
must be electrically connected to the control
device before commissioning.
Observe the installation and operating instruc-
tions and accompanying documents for the con-
trol device when making this connection and
applying the necessary settings.

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 device. If the pressure is less
than the set start-up pressure, depending on the
parameter settings and the control mode, the
control device first switches on the base-load
pump and, as required, the peak-load pump(s)
until the consumer pipes are filled with water and
the set pressure has built up.
Warning! Health hazard!
If the system has not been flushed up to now, it
should be flushed thoroughly at this point at the
latest (see Section 7.2.3).

8.4 Decommissioning the system

If the pressure boosting system has to be taken
out of service for maintenance, repairs or other
measures, proceed as follows:
• switch off the voltage supply and secure it against
being switched on again inadvertently,
• close the shut-off devices upstream and down-
stream of the system, and
• shut off the diaphragm pressure vessel at the
throughflow fitting and drain it,
• drain the system completely if necessary.
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