Twin-Head Pump Installation/Y-Pipe Installation; Setting Of Pump Output - Wilo Stratos GIGA Einbau- Und Betriebsanleitung

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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.
NOTICE
• Always keep to the minimum pressure!
• 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.
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 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.
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 operating button. The
display 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 located in the collector pipe
on the suction and discharge side of the twin-head pump system. The other pump shows the
status "SL" (= standby pump = partner pump). From now on, all further pump settings can
only be made via the main pump.
NOTICE
To manually change the main pump later, open menu <5.1.2.0> (for help
navigating the service menu, see section "Navigation").
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 B • Ed.01/2023-05