Twin-Head Pumps; Applications; Pumped Liquids; Installation - Grundfos MAGNA UPE 2000 Series Montage- Und Betriebsanleitung

1.1 Twin-head pumps

Twin-head pumps have a GENI module incorporated
in each terminal box. The modules are internally con-
nected with a wire. The modules determine the pump
operating mode, see section 6.11.4 Control of twin-
head pumps.

2. Applications

The GRUNDFOS MAGNA is designed for circulating
liquids in heating 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 optimize the setting of the pump duty point,
• systems with variable flow-pipe temperatures.

2.1 Pumped liquids

Thin, clean, non-aggressive and non-explosive liq-
uids, not containing solid particles, fibres or mineral
oil.
In heating systems, the water should meet the re-
quirements 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.
For water with a higher degree of hardness a direct-
coupled TPE pump is recommended.
The pump must not be used for the trans-
fer of inflammable liquids such as diesel
oil, petrol or similar liquids.

3. Installation

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

3.1 Changing the terminal box position

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 scald-
ing hot and under high pressure.
Change the terminal 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 tee 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/terminal 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 inspec-
tion screw.
Fig. 1
Fig. 2
Pos. Description
1 Inspection screw
2 Screw
3 Stator housing/terminal box
4 Rotor
5 Tee key
6 O-ring
3.2 Twin-head pumps
Note: Twin-head pumps mounted in horizontal pipes
must be fitted with an automatic air vent (Rp ¼) in
the upper part of the pump housing, see fig. 3.
The automatic air vent is not supplied with the pump.
Fig. 3
1
3
2
5
4
6
5