Maintenance And Repairs; Obvious Misuse; Other Hazards; Product Description - Wilo Sinum MP M-2-50 Notice De Montage Et De Mise En Service

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4.18. Maintenance and repairs

These services may only be carried out when the
system is shut down or if the expansion automat
is not required. The pressurisation equipment
must be taken out of service and guarded against
unintentional re-starting until the maintenance
work is finished. Note that the safety circuits and
data transmissions made whilst shutting down
could trigger the safety chain or lead to false
information. Existing instructions for the heating
or cooling unit as a whole must be observed. To
stop hydraulic components, block the relevant
sections and drain them using the safe system
water drains through the available drain connec-
tions, and relieve the pressure.
Caution: The maximum system water tempera-
ture in conducting components (vessel, pumps,
casings, hoses, pipelines, peripheral equipment)
may reach 70 °C and, in the case of improper op-
eration, may exceed that. This presents a danger
of burns and/or scalding.
The maximum pressure of system water in con-
ducting components may be equal to the maxi-
mum set pressure for the applicable safety valve.
Vessel, nominal pressure 3 bar, safety valve max.
3 bar; pump unit nominal pressure 6; 10 or 16 bar:
Safety valve max. 6; 10 or 16 bar. Use of eye/face
protectors is required if the eyes or face could be
injured by flying parts or spraying fluids.
To stop electrical equipment (control unit, pumps,
valves, peripheral equipment), cut power to the
control unit. The power supply must remain off
for the period of the work.
It is forbidden to alter or use non-original compo-
nents or replacement parts without authorisation.
Such acts may result in serious personal injury and
endanger operational safety. They will also render
any claim for damages against product liability
void.
It is recommended to contact Wilo Customer
Service for carrying out these services.

4.19. Obvious misuse

• Operation at incorrect voltage and/or frequency.
• Use in inappropriate system designs.
• Use of unpermitted installation materials.

4.20. Other hazards

• Overload of construction parts by the presence of
unpredictable extreme values.
• Operational continuity at risk in the case of
changed, non-permissible ambient conditions.
• Operational continuity at risk in the case of
safety-control parts being taken out of service or
malfunctioning.
8

5. Product description

The contents of this manual consist of the
specifications for a standard execution. Where
appropriate, this includes information on options
or other configurations. If optional extras are
supplied, further documentation will be supplied
in addition to this manual.

5.1. Operating principle

The varying pressure levels due to tempera-
ture changes in heating or cooling systems are
continuously monitored by the pressure sensor.
Comparison of these actual pressure levels with
a programmable nominal value leads to the trig-
gering of the valve (release of pressure by means
of water drainage) in the event of the value being
exceeded (temperature rise), and triggering of the
pump (pressure increase by means of feeding wa-
ter) in the event of the pressure dropping below
the nominal level (temperature drop). The volume
of water drained or fed in is made available or
taken up by the vessel. Continuous comparison
of the programmable nominal values with the
varying volumes registered by the vessel volume
sensor prevents dry-running of the pump, whilst
allowing the volume to increase by topping-up
water losses*. The pressure difference between
the volume of water in the vessel and in the
heating or cooling system allows the release of
dissolved gases. An optional, additional water
change increases the volume of gas that can be
released. Separated (released) gases are then
discharged into the atmosphere.
Open to the atmosphere
Gas evacuation
Diaphragm,
water chamber
Sensor
Contents
* Inappropriate commissioning / mode of operation can lead
to component overload and malfunction.
Fig. FM.001.V01.15
Control system
Pressure
sensor
Pump
M
Valve
WILO SE 08/2018