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16 WILO SE 03/2015
8.2.3 Setting the pump output
During planning, the unit is designed for a specific duty point (hydraulic full-load point for
maximum heating power requirement calculated). During commissioning, the pump out-
put (delivery head) is set according to the duty point of the system.
In systems requiring hot water priority, the pump can be set to the maximum fixed speed
stage (3).
If the system only requires a low volume flow, the pump can be set to the minimum fixed
speed stage (1). This is practical for manual setback operation, for example.
NOTE: The factory setting does not comply with the pump capacity required for the sys-
tem. It is determined with the help of the pump curve diagram for the selected pump type
(from catalogue/data sheet). See also Figs. 8 and 9.
Control modes p-c, p-v
:
8.3 Operation
Faults of electronic devices due to electromagnetic fields
Electromagnetic fields are created during the operation of pumps with frequency con-
verter. Interference of electronic devices may be the result. The result may be a device
malfunction, which can result in damage to the health or even death, e.g. of persons with
implanted active or passive medical devices. Therefore, during operation the presence of
any persons e.g. with cardiac pacemakers in the vicinity of the unit/pump should be pro-
hibited. With magnetic or electronic data media, the loss of data is possible.
8.4 Shutdown
The pump must be shut down before conducting maintenance, repair or dismantling
work.
DANGER! Risk of fatal accident!
Deadly electric shock may occur when working on electrical equipment.
• Have work on the electrical part of the pump carried out only by a qualified electrician
as a basic principle.
• Before starting any maintenance and repair work, disconnect the pump from the
power supply, and make sure it cannot be switched back on by unauthorised persons.
• Work on the control module may only be started after 5 minutes have elapsed, due to
the dangerous residual contact voltage.
• Check to ensure that all connections (including potential-free contacts) are voltage-
free.
• The pump may still be live even in voltage-free state. The drive rotor induces a dan-
gerous contact voltage at the motor contacts.
Close the check valves in front of and behind the pump.
• If the control module/plug is damaged, the pump must not be put into operation.
p-c (fig. 9) p-v (fig. 8)
Duty point on maxi-
mum pump curve
Draw from duty point towards the left.
Read off setpoint H
S
and set the pump to this value.
Duty point within
the control range
Draw from duty point towards the
left. Read off setpoint H
S
and set the
pump to this value.
Move to max. pump curve along con-
trol curve, then horizontally to the
left, read off setpoint H
S
and set the
pump to this value.
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