Twin-Head Pump; Handling And Storing The Product; Frost Protection - Grundfos MAGNA3 25-80 Installation And Operating Instructions Manual

4.2 Twin-head pump

Fig. 14 MAGNA3 D
The pumps are paired from factory. When switching on the power
supply, the heads will establish connection. Please allow
approximately 5 seconds for this to happen.
4.2.1 Multipump pairing
Note: Available for pumps with production code from 1838.
After turning on the power supply, the pump's initial setup menu
asks you whether or not you want to keep multipump system
activated. Several scenarios can play out.
Keep multipump system
• Only one pump head is connected to the power supply.
If you have not connected both pump heads to the power
supply and you choose to keep the multipump system,
warning 77 appears in the display. See fig. 15. Connect the
second pump head. Once both pumps are on, the pump heads
will establish connection and the warning deactivates.
• Both pump heads are connected to the power supply.
Configuring is only necessary from one of the pump heads.
Dissolve multipump system
• Only one pump head is connected to the power supply.
If you have not connected both pump heads to the power
supply and you choose to dissolve the multipump system, the
second pump head, if connected to the power supply, will ask
you whether or not you want to keep the multipump system.
Choose to dissolve the multipump system.
• Both pump heads are connected to the power supply.
Configuring is only necessary from one of the pump heads.
Fig. 15 Warning 77
See sections 7.9.3 Digital inputs,
7.5 Multipump modes for additional twin-head pump setup
options.
4.2.2 Configuring twin-head pumps
If you replace a pump head of a twin-head pump, the twin-head
pump will function as two single pumps until you have configured
the pump heads and warning 77 is shown in the pump display.
See fig. 15.
To establish communication between the pump heads, run the
multipump setup via the "Assist" menu. The pump from which you
run the setup will be the master pump. See section
8.8.3 "Multipump setup".
16
7.9.2 Relay outputs and

5. Handling and storing the product

5.1 Frost protection

If the pump is not used during periods of frost, take
the necessary steps to prevent frost bursts.