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ENGLISH
1 General Information
Uses
The Wilo-Smart circulating pumps
are used to pump liquids in pipe
installations.
The pump must not be used
for handling drinking water
or food-related liquids.
Its main fields of application are:
– Hot-water heating, various
systems,
– Air-conditioning units and cold-
water distribution.
Rating plate Smart 25/4
Heating circulating pumps,
wet runner motors
Screwed pipe pump
Nominal width [mm]
25 (=1HH),
Maximum delivery head [m]
Connection and electrical data
Connection voltage: 1~230 V
±10%, 50 Hz
Insulation class: F (155°C)
Temperature class: TF95
System of protection: IP 42
Differential pressure
range: 3-channel
selector
switch
Fitting length 180 mm
Perm. operating
pressure, max.: 10 bar
Perm. medium
temperatures: +2°C to
+95°C
Perm. ambient
temperature, max.: +40°C
Min. inlet pressure* at suction side
at
+82°C: 0.15 bar
+95°C: 0.3 bar
+110°C: 1.0 bar
*These values are valid up to 300
m above sea level. For higher ele-
vations add: 0.01 bar/100 m.
The minimum inlet pressure must
be maintained in order to avoid
cavitation noise!
Flow media:
– Heating water acc. to VDI 2035
– Water and water/glycol mixtures
in a ratio up to 1:1. In the case of
glycol admixtures the delivery
data of the pump is to be cor-
rected according to the higher
viscosity, depending on the per-
centage mixture ratio. Only
brand products with anti-corro-
sion inhibitors should be used.
The manufacturer's instructions
must always be strictly adhered
to.
– Clearance must be obtained
from WILO if other media are
used.
2 Safety
These instructions contain impor-
tant information which must be fol-
lowed when installing and opera-
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