Wilo Wilo-Star AC, Installation And Operating Instructions Manual

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17
ENGLISH
Speed setting (Fig. 8)
The speed of the pump can be adju-
sted with a 3-position rotary button. In
position 3 the speed is approx.
40...50 % of the maximum speed with
the power consumption being redu-
ced to 50 %.
Particular features of the pumps
Double pumps
contain two identical-
ly constructed pump heads in a com-
mon pump housing with integrated
change-over flap. Each pump can run
in single mode, and both pumps can
also run simultaneously in parallel
mode. The operating modes are
main/reserve operation or incremen-
tal/peak-load operation. The pump
heads can be selected of different
capacities. Double pumps are suitable
of adapting a pipe system to suit indi-
vidual load characteristics. The S2R
3D control unit must be connected to
control the different operating modes.
The
ST... and RSG... pumps are pumps
with special hydraulics for use in solar
thermal systems (Type ST...) or geo-
thermal systems (Type RSG...).
The
AC 20/...-I(O) pump is an air-
conditioning pump with a plasitc
(composite) pump housing for use in
air-conditioning units and cold-water
distribution.
In the AC ../..
-I :
(I = i nline) pump the pump housing is
designed „inline“-, i. e. suction and
pressure connections are in line.
The AC ../..
-O :
(O = o ffline) pump is equipped with
axial suction and radial discharge
connection.
Accessories
Accessories must be ordered separa-
tely.
– Inserts for the pipe connection of
the screwed-pipe pump.
– S2R 3D switchgear for double
pump.
– Thermal insulating units for later
insulation of the ST/RSG 25 pump.
5 Assembly/
Installation
Installation
Installation and ser-
vice by qualified per-
sonnel only!
– Assembly should only take place
once all welding and soldering
work and the rinsing of the pipe
network has been completed. Dirt
can have an adverse effect on the
functioning of the pump.
– The pump must be installed in an
easily accessible position to facili-
tate inspection or replacement.
– It is recommended that shut-off
devices be fitted before and after
the pump. This will save having to
drain and refill the system if the
pump needs replacing. The fittings
are to be installed so that any water
that escapes cannot drip onto the
pump motor or terminal box.
– When installed into the flow pipe of
an open-vented system, the open
safety vent must be connected to
the system on the inlet side of the
pump.
ATTENTION!