Pump Head Position; Changing The Control Box Position - Grundfos MAGNA3 25-80 Installation And Operating Instructions Manual

3.6 Pump head position

If you remove the pump head before installing the pump in the
pipes, pay special attention when fitting the pump head to the
pump housing:
1. Visually check that the floating ring in the sealing system is
centred. See figs 7 and 8.
2. Gently lower the pump head with rotor shaft and impeller into
the pump housing.
3. Make sure that the contact face of the pump housing and that
of the pump head are in contact before you tighten the clamp.
See fig. 9.
Fig. 7 Correctly centred sealing system
Fig. 8 Incorrectly centred sealing system
Observe the position of the clamp before you tighten
it. Incorrect position of the clamp will cause leakage
from the pump and damage the hydraulic parts in
the pump head. See fig. 9.
Fig. 9 Fitting the pump head to the pump housing

3.7 Changing the control box position

The warning symbol on the clamp holding the pump
head and pump housing together indicates that there
is a risk of personal injury. See specific warnings
below.
CAUTION
Crushing of feet
Minor or moderate personal injury
- Do not drop the pump head when loosening the
clamp.
CAUTION
Pressurised system
Minor or moderate personal injury
- Pay special attention to any escaping vapour
when loosening the clamp.
Fit and tighten the screw that holds the clamp to 8
Nm ± 1 Nm. Do not apply more torque than specified
even though water is dripping from the clamp. The
condensed water is most likely coming from the drain
hole under the clamp.
Check the position of the clamp before you tighten
the clamp. Incorrect position of the clamp will cause
leakage from the pump and damage the hydraulic
parts in the pump head.
Make sure that the isolating valves are closed
before rotating the control box.
7