Electrical Installation; Control Panel; Start-Up - Grundfos Hydro Multi-S CM Montage- Und Betriebsanleitung

6.1.4 Foundation
The booster system should be positioned on an even and solid
surface. If the booster system is not fitted with machine shoes, it
must be bolted to the floor.
Hydro Multi-S systems with CM pumps must
Note
always be bolted to the floor.
6.1.5 Expansions joints
The purpose of expansion joints is as follows:
• To absorb expansions/contractions in the pipework caused by
changing liquid temperature.
• To reduce mechanical strains in connection with pressure
surges in the pipework.
• To isolate mechanical structure-borne noise in the pipework
(only rubber-bellows expansion joints).
Expansion joints must not be installed to
Note compensate for inaccuracies in the pipework
such as centre displacement of ports.
Fit the expansion joints at a distance of minimum 1 to 1 1/2 times
the nominal port diameter from the suction and discharge
manifolds. This prevents the development of turbulence in the
expansion joints, resulting in better suction conditions and a
minimum pressure loss on the discharge side.
The pipework should be anchored so that it does not stress the
expansion joints and the pump. Follow the supplier's instructions
and pass them on to advisers or pipe installers.

6.2 Electrical installation

Warning
The electrical connection must be carried out by
an authorised person in accordance with local
regulations and the relevant wiring diagram.
Make sure to disconnect the power supply using
the mains switch and lock it with a padlock to
ensure that it cannot be accidentally switched on.
The following must be observed:
• The electrical installation of the booster system must comply
with enclosure class IP54.
• Make sure that the booster system is suitable for the power
supply to which it is connected.
• Make sure that the wire cross-section corresponds to the
specifications in the wiring diagram.
See also the wiring diagram supplied with the
Note
booster system.
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7. Control panel

The Grundfos Hydro Multi-S booster system can be controlled via
the control panel integrated in the control cabinet. See fig. 4.
1
2
3
4
5
6
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Fig. 4 Control panel
Pos. Description
1 LED indication for dry-running alarm
2 Pump number
3 LED indication for fault status (three-phase pumps only)
4 LED indication for pump running
5 Buttons for manual operation
6 Buttons for stopping the pumps
7 Buttons for automatic operation
8 LED indication for power on

8. Start-up

Do not start the booster system until the pumps
Caution
and the suction pipe have been filled with liquid.
To start up the booster system, proceed as follows:
1. Connect water and power supplies.
2. Close the valve on the discharge side of all the pumps.
3. Prime all pumps, and make sure that the suction manifold and
the suction pipe are primed as well.
4. Check that the tank precharge pressure is equal to 0.9 x cut-in
pressure.
5. Switch on the power supply.
6. Start the first pump by pressing and holding down the button
for manual operation.
7. Check the direction of rotation of the pump.
If the direction of rotation is wrong, interchange two phases of
the power supply.
8. Vent the pump by slowly opening its discharge valve.
9. Repeat the same procedure for the other pumps.
10. Release the booster system for automatic operation by
pressing the button for automatic operation.
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