Grundfos ALPHA+ 15-40, Installation And Operating Instructions Manual

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3.1 Terminal box positions
The terminal box can be turned to the positions
shown in
o
.
3.2 Changing the terminal box position
Change the terminal box position as shown in
p
.
3.3 Bypass valve
3.4 Non-return valve
If a non-return valve is fitted in the pipe system,
see
q
, it must be ensured that the minimum
pump pressure is always higher than the clos-
ing pressure of the valve.
3.5 Air separator pump
4. Electrical connection
The electrical connection and protection should
be carried out in accordance with local regula-
tions.
Before the screws are removed, the
system must be drained or the isolat-
ing valves on either side of the pump
must be closed as the pumped liquid
may be scalding hot and under high
pressure.
If the pump is installed in a two-pipe
system with a bypass valve between
flow pipe and return pipe, it is recom-
mended to set the pump to constant
pressure control as illustrated in the
figure.
GRUNDFOS ALPHA+ pumps type A
must be fitted with an automatic air
vent. This must be fitted to the pump
housing before priming.