Wilo Stratos GIGA Notice De Montage Et De Mise En Service page 126

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Fig. 30: Air vent valve
10.3 Twin-head pump installation/Y-
pipe installation
Fig. 31: Setting to main pump
10.4 Setting of pump output
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Fill and vent the system correctly.
1. To do this, loosen the air vent valves and vent the pump.
2. After venting the pump, tighten the air vent valves again so that no more water can es-
cape.
• To avoid cavitation noises and damage, a minimum inlet pressure must be guaranteed at
the suction port of the pump. The minimum inlet pressure depends on the operating situ-
ation and the pump's duty point. Accordingly, the minimum pressure must be determined.
• The main parameters for defining the minimum inlet pressure are the NPSH value of the
pump at its duty point and the vapour pressure of the fluid. The NPSH value can be found
in the technical documentation of the respective pump type.
On acknowledgement of the error message, menu <5.1.2.0> is displayed and "MA" (= main
pump) flashes. To acknowledge "MA", access disable must be deactivated and the service
mode must be active. Both pumps are set to "Main pump" and "MA" flashes on the displays
of both electronic modules.
• Confirm one of the two pumps as the main pump by pressing the control knob. The dis-
play on the main pump shows the status "MA".
• Connect the differential pressure sensor at the main pump.
The measuring points of the differential pressure sensor must be on the suction and dis-
charge side of the two-pump system in the corresponding collector pipe. The other pump
shows the status "SL" (= standby pump = partner pump). From now on, all further pump set-
tings can only be made via the main pump.
The system was designed for a certain duty point (full load point, calculated maximum
heating or cooling power demand). During commissioning, the pump output (delivery head)
is set according to the duty point of the system.
The factory setting does not correspond to the output required for the system. The re-
quired pump capacity is determined with the help of the pump curve diagram for the selec-
ted pump type (e.g. from the data sheet).
Installation and operating instructions • Wilo-Stratos GIGA, Wilo-Stratos GIGA-D, Wilo-Stratos GIGA B • Ed.01/2024-02
NOTICE
• Always keep to the minimum pressure!
NOTICE
When pumping from an open tank (e.g. cooling tower), ensure that there is
always a sufficient liquid level above the pump's suction port. This pre-
vents the pump from running dry. The minimum inlet pressure must be
observed.
NOTICE
For a two-pump system, the left-hand pump in the direction of flow is
already factory-configured as the master pump.
NOTICE
For the initial commissioning of a Y-pipe installation that has not been
preconfigured, both pumps are set to their factory setting. After con-
necting the twin-head pump communication cable, the error code
"E035" is displayed. Both drives run at the emergency operation speed.
NOTICE
To manually change the main pump later, open menu <5.1.2.0> (for help
navigating the service menu, see section "Navigation").