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7.3
Twin-head pump installation/Y-
pipe installation
Fig. 31: Setting the master pump
7.4
Setting of pump output
36
Commissioning
WARNING
Risk of personal injury and material damage due to extremely hot or ex-
tremely cold pressurised fluid!
Depending on the temperature of the fluid, when the venting device is opened com-
pletely, extremely hot or extremely cold fluid may escape in liquid or vapour form.
Fluid may shoot out at high pressure depending on the system pressure.
• Make sure the venting device is in a suitable, secure position.
• Protect the electronic module from any water escaping when venting.
• Always exercise caution when opening the venting device.
Procedure for venting systems where the fluid level is above the suction port of the
pump:
ƒ
Open the shut-off device on the discharge side of the pump.
ƒ
Slowly open the shut-off device on the suction side of the pump.
ƒ
To vent, open the venting device on the discharge side of the pump or on the pump.
ƒ
Close the venting device as soon as fluid escapes.
Procedure for filling/venting systems with a non-return valve, where the fluid level
is below the suction port of the pump:
ƒ
Close the shut-off device on the discharge side of the pump.
ƒ
Open the shut-off device on the suction side of the pump.
ƒ
Fill in liquid through a funnel until the suction line and the pump are completely
filled.
NOTICE
For the initial commissioning of a Y-pipe installation that has not been precon-
figured, both pumps are set to their factory setting. After connecting the twin-head
pump communication cable, the error code "E035" is displayed. Both drives run at
the emergency operation speed.
After acknowledging the error message, menu <5.1.2.0> is displayed and "MA" (= mas-
ter) flashes. In order to acknowledge "MA", access disable must be deactivated and ser-
vice mode must be active. Both pumps are set to "master" and "MA" flashes on the dis-
plays of both electronic modules.
ƒ
Acknowledge one of the two pumps as master pump by pressing the operating but-
ton. The status "MA" appears on the display of the master pump.
ƒ
Close the differential pressure sensor at the master.
The measuring points of the differential pressure sensor must be on the suction and
discharge side of the double-pump system in the common collector pipe. The other
pump will display the status "SL" (= slave). All further pump settings must now be made
via the master only.
NOTICE
To change the master pump manually later on, call up menu <5.1.2.0> (for naviga-
tion in the service menu, see "Navigating" chapter).
The system was designed for a certain duty point (full load point, calculated maximum
heating load). During commissioning, set the pump output (delivery head) 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 output is determined with the help of the pump curve diagram for the se-
lected pump type (e.g. from the data sheet).
WILO SE 2020-10
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