Assembly/Installation - Wilo Star RS Instrucciones De Instalación Y Funcionamiento

tion bearing and cools both bearing
and rotor.
No motor overload protection is
required.
Even the maximum overload current
cannot damage the motor. The motor
operates non-overloading.
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 identically
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 paral-
lel 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 suita-
ble of adapting a pipe system to suit
individual load characteristics. The
S2R 3D control unit must be connec-
ted to control the different operating
modes.
The ST 20 (25)/... pump is a solar
thermal pump with special hydraulics
(pump housing coated) for use in
thermal solar systems.
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 = inline) pump the pump housing is
designed „inline"-, i. e. suction and
pressure connections are in line.
The AC ../..-O:
(O = offline) pump is equipped with
axial suction and radial discharge
connection.
Accessories
Accessories must be ordered sepa-
rately.
– 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 25 pump.
5 Assembly/
Installation
Installation
Installation and servi-
ATTENTION!
ce 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 fit-
tings are to be installed so that
ENGLISH
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