Changing The Control Box Position; Two Pumps In Parallel; Check Valve; Frost Protection - Grundfos MAGNA 2000 Serie Notice D'installation Et D'entretien

4. Installation
Arrows on the pump housing indicate the liquid flow
direction through the pump.

4.1 Changing the control box position

WARNING!
Before any dismantling of the pump,
the system must be drained or the
isolating valves on either side of the
pump must be closed as the pumped
liquid may be scalding hot and under
high pressure.
Change the control box position as follows:
1. Remove the inspection screw (1) and the four
Allen screws (6 mm) (2) in the stator housing, see
fig. 1.
2. Lift off the stator housing (3). Keep the rotor (4) in
place using a suitable tool, e.g. a T-key (M8) (5),
see fig. 2.
3. Check that the O-ring (6) is intact.
A defective O-ring must be replaced.
4. Hold the stator housing/control box (3) in the
desired position.
5. Lower the stator housing over the rotor.
Keep the rotor in place as described in point 2.
6. Fit and tighten the four screws, torque
14-17.5 Nm, and the inspection screw, torque
8-10 Nm.
Fig. 1 Removing the control box
Fig. 2 Changing the control box position
Pos. Description
1 Inspection screw
2 Screw
3 Stator housing/control box
4 Rotor
5 T-key (not provided with the pump)
6 O-ring

4.2 Two pumps in parallel

Two pumps in parallel can be controlled via the
optional GENI module. Both pumps should have a
GENI module installed in the control box. The
modules are connected with a wire. The modules
determine the pump operating mode, see section
7.11 GENI module.

4.3 Check valve

If a check valve is fitted in the pipe system, see fig.
3, it must be ensured that the set minimum discharge
pressure of the pump is always higher than the
closing pressure of the valve. This is especially
important in proportional-pressure control mode
(reduced head at low flows).
Fig. 3 Check valve

4.4 Frost protection

If the pump is not used during periods of frost,
necessary steps must be taken to prevent frost
bursts.
Additives with a density and/or
kinematic viscosity higher than those/
Note
that of water will reduce the hydraulic
performance.
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