Pentair U3 K Instructions De Service page 12

ENGLISH
ELECTRICAL
CONNECTION
NOTICE! Only qualified electricians may carry
out electrical works to the pump or the controls.
WARNING!
Before carrying out any works: disconnect the
pump and the controls from the mains and take
steps to ensure that no one else can reconnect
them to the power supply.
The relevant standards (such as EN standards),
country-specific regulations (such as VDE in
Germany), and the regulations of the local power
supply companies must be observed.
NOTICE! Never put the mains plug or a free lead
end in water! If water gets into the plug, this can
cause malfunctions and damage.
Observe the operating voltage (see the type
plate)!
The pump is provided with a winding thermo-
stat. In case of unacceptably high temperatures
it switches off the pump to protect it against
possible damage. Unacceptably high tempera-
tures may result e.g. from dry running or me-
chanical or electrical overload.
CAUTION!
The pump is switched on again automatically af-
ter cooling down - risk of injury!
For this reason, always disconnect the device
from the mains before remedying the fault! In
order to do this, unplug from the mains supply
or remove the pre-fuses of the pump controls!
Rotational direction
Applies only for three-phase pumps. The rota-
tional direction must be checked before instal-
lation! If the rotational direction is correct, the
start-up jolt should be counter-clockwise. If the
rotational direction is wrong, 2 phases of the
supply cable must be swapped over, because a
wrong direction of rotation results in an over-
load of the pump.
12 12
Alternating and three-phase current circuit dia-
grams
INSTALLATION
The pump must be installed as shown in the ex-
amples. For installations in accordance with EN
12056-4, the pressure pipe must be laid in a loop
above the local backflow level and protected
with a backflow prevention valve. The rubber
flap supplied (U3 and U5) is for mobile operation
only.
A correspondingly larger diameter pipe should
be used for longer pressure pipelines to avoid
pipe friction losses.
In contrast to pumps with built-in level control,
the ON an OFF switching heights of pumps with-
out built-in level control are variable by the use
of a separate level controller. Our ready to con-
nect level controls can be installed without spe-
cific electrotechnical skills.
Permanent venting may be necessary if the
pump runs dry from time to time (pressure out-
let surfaced). This can occur for example if the
residual water in the collecting chamber evapo-
rates or if the pump runs in "snore" mode during
the test run.
To vent the pump housing the attached elbow
must be drilled at the marked location to provide
a 6 mm drill-hole.
NOTICE! If the pump is malfunctioning, part of
the contents of the oil reservoir could escape
into the pumping medium.