Modules Connected In Series And In Parallel; Electrical Connection - Grundfos BMQ Montage- Und Betriebsanleitung

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5.1 Modules connected in series and in
parallel
1. For modules connected in series, mounted above
each other, it is recommended to connect the
pipes as shown in fig. 3.
2. For modules connected in parallel, mounted
above each other, it is recommended to connect
the pipes as shown in fig. 4. This layout ensures
that the modules are filled with water before start-
ing.
3. When modules are connected in series and par-
allel, mounted above each other, it is recom-
mended to connect the pipes as shown in fig. 5.
4. For modules connected in series and fitted with a
bypass, mounted above each other, it is recom-
mended to connect the pipes as shown in fig. 6.
Fig. 3 Booster unit with four modules connected in
series, mounted above each other.
Bypass
4"
4"
3"
3"
Note: In the case of constant-pressure control of
BMQE-NE modules connected in series, it is recom-
mended to control the last controllable module in the
booster unit.
Fig. 4 Booster unit with four modules connected in
parallel, mounted above each other.
Bypass
3"
4
Bypass
3"
3
Bypass
3"
2
Bypass
3"
1
Fig. 5 Booster unit with two modules connected in
series and in parallel, mounted above each
other.
Bypass
3"
3"
Bypass
3"
3"
6
Note: In the case of constant-pressure control of
BMQE-NE modules connected in series, it is recom-
mended to control the last controllable module in the
booster unit.
Fig. 6 Booster unit with four modules connected in
series with bypass, mounted above each
other.
Note: In the case of constant-pressure control of
BMQE-NE modules connected in series, it is recom-
mended to control the last controllable module in the
booster unit.
4
3
2
1
All modules are supplied without non-return valve.
Booster modules connected in parallel may also be
installed vertically.
Note: As venting problems may arise in such instal-
lations, it is advisable to install suitable air vent
devices.

6. Electrical connection

The electrical connection should be carried out by an
authorized electrician in accordance with local regu-
lations.
Before starting work on the booster mod-
ule, make sure that the electricity supply
4
has been switched off and that it cannot be
accidentally switched on.
3
The booster module must be earthed.
The booster module must be connected to
2
an external mains switch.
1
The supply voltage, rated maximum current and
power factor (PF) appear from the booster module
nameplate.
Bypass
4"
4
4"
3
3"
2
3"
1
= Air escape valve
Air escape va
= Isolating valve Closing valve
Non return valv
= Non-return valve
Pressure switc
= Pressure switch
= Flow switch Flow switch
Pressure gaug
= Pressure gauge
Motor operated
= Motor-operated valve
= Diaphragm tank Diaphragm tan