Setting The Pump Power - Wilo Stratos 1.25x3-20 Notice De Montage Et De Mise En Service

English
Unit type
Heating systems
Heating-/ventilation- and
air conditioning systems
Circulation systems for
drinking water
Heating systems

8.4 Setting the pump power

During the planning phase the system is designed for a certain duty point
(hydraulic peak load point for calculated maximum heating requirement). The
pump performance (delivery head) is set during commissioning according to the
duty point of the system (see also 4.3). The factory setting does not correspond
to the pump performance required for the system. It is determined by means of
the curve diagram for the selected pump type (from catalogue/data sheet). See
also figs. 6 to 8.
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System conditions
1. Two-pipe systems
• Pump installed in the supply pipe.
• Flow temperature controlled by
atmospheric conditions.
With increasing flow temperature the
flow rate will be increased.
2. Single-pipe systems
• Pump installed in the return pipe.
• Constant flow temperature.
With increased return temperature
the flow rate will be lowered.
3. Primary circuits with condensing
boiler
• Pump installed in the return pipe.
With increased return temperature
the flow rate will be lowered.
1. Constant flow rate
1. All systems
• Pump installed in the supply pipe.
• Flow temperature will be lowered in
light loads periods (e.g. night).
• Pump runs 24h without external
control.
Subject to technical alterations!
Recommended
control system
'p-T
Regulator
mode
Night setback
mode
WILO SE 02/2011