15
ENGLISH
Perm. ambient
temperatures max.: +40 °C
Min. inlet pressure** at suction side at
+ 50 °C: 0.05 bar
+ 95 °C: 0.3 bar
+ 110 °C: 1.0 bar
* For double pumps the additional
switchgear S2R 3D is required for
time-controlled main/reserve or
additional/peak-load operation.
** The values are valid up to 300 m
above sea level. For higher elevati-
ons add: 0.01 bar/100 m.
The minimim inlet pressure must be
maintained in order to avoid cavita-
tion noise!
Permissible fluids:
– Heating water acc. to VDI 2035
– Water and water/glycol mixtures in
a ratio up to 1:1. Glycol mixtures
require a reassessment of pump
hydraulic data in line with the
increased viscosity and depending
on mixing ratios. Only approved
makes of additives with corrosion
inhibitors must be used in strict
compliance with manufacturers'
instructions.
– For use of other kinds of fluids con-
sult WILO first.
2 Safety
These instructions contains basic
reference which must be strictly adhe-
red. It is therefore imperative for the
installer and operator to carefully read
these instructions prior to installation
and commissioning.
Please observe, not only the safety
directions under the main heading
„safety rules“, but also those added
and specially marked under the
ensuing headers.
Safety marks contained in these
instructions
Safety rules contained herein which, if
not complied with, may be dangerous
to persons are specially highlighted by
the following danger symbols:
Danger from electrical causes:
Safety references which, if not com-
plied with, may cause damage to the
pump / installation or impair its func-
tions are highlighted by the word:
Staff training
The personnel installing the pump /
unit must have the appr
opriate qualifi-
cations for this work.
Dangers from non-observance of
safety rules
Non-observance of safety reference
may cause personal injury or damage
to the pump or installation. Failure to
comply with the safety references
could invalidate warranty and/or
damage claims.
In particular, non-compliance may, for
example, cause the following dange-
rous situations:
ATTENTION!
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