Wilo STRATOS GIGA, Installation And Operating Instructions Manual, Page: 111 / 265

English
Installation and operating instructions Wilo-Stratos GIGA, GIGA-D, GIGA B
(11-22kW)
111
• Acknowledge one of the two pumps as master pump by pressing the
operating button. The status “MA” appears on the display of the mas-
ter pump. The differential pressure sensor must be connected on the
master.
The measuring points of the master pump differential pressure sensor
must be on the suction and pressure side of the double-pump system
in the respective collector pipe.
The other pump will then display the status “SL” (= slave).
All further pump settings must now be made via the master only.
NOTICE:
The procedure can be manually started later by selecting the
menu <5.1.2.0>.
(For information about navigation in the service menu, see
chapter 8.6.3 "Navigation" on page 100).
9.3 Setting of pump output • The system was designed for a certain duty point (full load point, cal-
culated maximum heating load). During commissioning, the pump
output (delivery head) is to be set according to the duty point of the
system.
• The factory setting does not correspond to the output required for
the system. It is determined with the help of the pump curve diagram
for the selected pump type (e.g. from the data sheet).
NOTICE:
The flow value shown on the IR-Monitor/IR-Stick display or output to
the building management system must not be used to control the
pump. This value is merely an indicator of general trends.
A flow value is not output on every pump type.
CAUTION! Risk of material damage!
An inadequate volume flow can lead to damage on the mechanical
seal; the minimum volume flow depends on the speed of the pump.
• Make sure that the volume flow does not fall below the minimum
value Q
min
.
Calculation of Q
min
:
9.4 Setting the control mode
Δ p-c/ Δ p-v control:
Q
min
= 10 % x Q
max pump
x
Actual speed
Max. speed
Fig. 43: Δ p-c/ Δ p-v control
Q
s
H
max
H
H
s
H
min
H
s
1
2
Q
H
H
Q
H
max
H
s
H
min
H
s
1
2
Setting (Fig. 43) Δ p-c Δ p-v
Duty point on
maximum pump
curve Starting at the duty
point, draw towards the
left. Read off setpoint
H
S
and set the pump to
this value.
Starting at the duty
point, draw towards the
left. Read off setpoint
H
S
and set the pump to
this value.
Duty point
within the
control range Starting at the duty
point, draw towards the
left. Read off setpoint
H
S
and set the pump to
this value.
Move to max. pump
curve along control
curve, then horizontally
to the left, read off
setpoint H
S
and set the
pump to this value.
Setting range H
min
, H
max
see pump curves
(e.g. on data sheet)
H
min
, H
max
see pump curves
(e.g. on data sheet)
1
2