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28 WILO SE 11/2023
Minimum inlet pressure (above atmospheric pressure) at the pump suction port
in order to avoid cavitation noises (at fluids temperature T
Med
):
The values apply up to 300 m above sea level; addition for higher locations:
0.01 bar/100 m increase in height.
5.3 Scope of delivery
• Pump complete
• 2 gaskets for threaded connection
• Two-piece thermal insulation shell
• 8 pcs M12 washers
(for M12 flange screws on combination flange version DN 40 – DN 65)
• 8 pcs M16 washers
(for M16 flange screws on combination flange version DN 40 – DN 65)
• Installation and operating instructions
5.4 Accessories
Accessories must be ordered separately:
• Switching plug for 3 ~ 230 V
See catalogue for detailed list.
6 Description and function
6.1 Description of the pump
The pump is fitted with a glandless pump motor (single-phase current (1~) or
three-phase current (3~), for mains connection voltage and mains frequency
see the rating plate, in which all the rotating parts are in contact with the fluid.
The design relies on the fluid to provide lubrication for the plain bearings of the
rotor shaft.
The motor is multi-speed. Speed switching is executed in different ways
depending on the terminal box. The ways are either by a speed selection switch,
by plugging in the switching plug differently or by an internal or external bridg-
ing of the contacts. (see commissioning/speed change-over).
A suitable switching plug is available as an accessory for 3~ 230 V.
The assignment of terminal boxes to the individual pump types is described
in the section “Terminal boxes” (section 6.2).
The pumps from this series are specifically matched with the operating condi-
tions in domestic hot water circulation systems (see also DIN 50930-6/TrinkwV
(German Drinking Water Ordinance) in Germany) in terms of the choice of mate-
T
med
Rp ¾ Rp 1 Rp 1¼ DN 40 DN 50 DN 65 DN 80
+50 °C 0.5 bar 0.8 bar
+80 °C 0.8 bar 1.0 bar
+110 °C 2.0 bar 3.0 bar
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