Operation Modes And Parameters; Setting Scala1 Twin Booster System - Grundfos SCALA1 Installation And Operating Instructions Manual

10.1 Operation modes and parameters

Once SCALA1 is installed as a twin booster system, it can run in
two different operation modes.
Duty/Standby
In Duty/Standby operation mode, only one pump will run at a time in
the twin system. This means that the maximum performance of the
system will be the same as the maximum performance of a single
SCALA1 unit. In case one pump fails to start, the other one will run.
The pumps will switch priority at the start based on the alternation
settings.
Duty/Assist
Running in Duty/Assist operation mode brings more flow on the
outlet side, as both pumps can run at the same time. A pump with
an assigned priority will start first and, in case it cannot deliver the
necessary flow, the second pump will start. In case one pump fails
to start, the system will continue running with one pump. The
pumps will switch priority at the start based on the alternation
settings.
Alternation can be set based on runtime or number of starts. This is
done through the Grundfos GO Remote application, either in the
initial setup or through the Settings tab on the Dashboard screen.
"No alternation" is only available for selection when
operating in Duty/Assist.

10.2 Setting SCALA1 twin booster system

WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you start any work
on the product. Make sure that the power supply
cannot be switched on accidentally.
WARNING
Electric shock
Death or serious personal injury
‐
The protective earth (PE) of the power outlet must be
connected to the protective earth of the pump. The
plug must have the same PE connection system as
the power outlet.
‐
All electrical connections must be carried out by qualified
persons in accordance with local regulations.
If the power cable is damaged, it must be replaced by the
manufacturer, the manufacturer's service partner or a
similarly qualified person.
Make sure that the electrical installation supports the rated
current [A] of the product. See the nameplate of the
product.
Twin base plate, manifolds and communication cable are available
in the SCALA twin accessory set.
To enable the twin operation of two SCALA1 pumps, follow the
steps below.
1. Position both pumps on the twin base plate without fastening
them.
2. Open the cover of both pumps by removing the screws.
3. Punch open the vacant hole/slot on the side of the pump body
and pull one end of the communication cable through the hole.
PUNCH HOLE
Punch hole for communication cable
4. Plug in the communication cable in the control board of the
pump.
COMMUNICATION CABLE INPUT
Connect communication cable
5. Connect the other end of the communication cable to the
second pump according to the instructions in steps 2 - 4.
6. Fasten both pumps to the base plate.
7. Connect the inlet and outlet manifolds to both pumps.
8. Prime both pumps according to the priming instructions.
Fasten pumps to base plate and connect inlet and outlet manifolds
9. Follow the startup instructions.
10. Connect to Grundfos GO Remote and follow the initial setup
screen.
11. Press the connect button on the operating panel of one of the
pumps to establish the connection between the twin pumps
12. Follow the instructions in Grundfos GO Remote for setting up
the twin booster system.
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