Applications; Pumped Liquids; Installation; Positioning - Grundfos MAGNA 40-120 Montage- Und Betriebsanleitung

3. Applications

The GRUNDFOS MAGNA is designed for circulating
liquids in heating and air-conditioning systems. The
pump can also be used in domestic hot-water
systems.
The pump range is primarily used in
• systems with a variable flow.
The pump range can also be used in
• systems with a constant flow where it is
desirable to optimise the setting of the pump duty
point,
• systems with variable flow-pipe temperature.

3.1 Pumped liquids

Thin, clean, non-aggressive and non-explosive liquids,
not containing solid particles, fibres or mineral oil.
In heating systems, the water should meet the
requirements of accepted standards on water quality
in heating systems, e.g. the German standard
VDI 2035.
In domestic hot-water systems, it is advisable to
use GRUNDFOS MAGNA pumps only for water with
a degree of hardness lower than approx. 14 °dH.
Warning
The pump must not be used for the
transfer of inflammable liquids such as
diesel oil, petrol or similar liquids.

4. Installation

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

4.1 Positioning

GRUNDFOS MAGNA must be installed with the
pump head in horizontal position. See page 347.

4.2 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
screws (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 and the inspection
screw.
Fig. 1 Removing the control box
1
3
2
7