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8 Subject to technical alterations! WILO SE 03/2016
Min. pump inlet pressure [psi] at the suction side during operation by Wilo-
Stratos model:
The values apply up to 984 ft above sea level, add-on for higher altitudes:
0.15 psi/328 ft increase in height
5.3 Scope of Supply
• Complete pump
• Installation and operating instructions
• 2 flange gaskets (only for 1.25, 1.5 and 2 inch flange pumps)
5.4 Accessories
• Accessories such as companion flanges must be ordered separately.
• Companion flanges (included bolts, nuts and gaskets) for flange-pipe connection.
• IR (infra-red) module/IR stick (USB) for special setup and diagnostics.
• IF (interface) Module Stratos Ext. Off/SBM, Ext.Min, LON, BACnet.
6 Description and function
6.1 Pump description
Wilo-Stratos high-efficiency pumps are glandless pumps with integrated
differential pressure control and “Electronic Commutated Motor” (ECM)
technology. They can be installed as single-head (fig. 1a) or twin-head pumps
(fig. 1b).
1 Control module
1.1 Infrared interface
1.2 LC display
1.3 Red button
2 Pump housing
6.2 Operation of the pump
If the pump has an axial design, there is a control module (fig. 1a, Pos.1) on the
motor housing, which regulates the differential pressure of the pump to an
adjustable setpoint within the control range. The differential pressure is based
on different criteria, depending on the control mode. In all control modes,
however, the pump constantly adapts to the changing output requirements of
the system, which arise in particular when using thermostatic valves, zone
valves or mixers.
At these liquid temps T
Med
14°F...122°F
(- 10°C...+50°C)
203°F
(+95°C)
230°F
(+110°C)
1.25 inch 4.4 (psi) 14.5 (psi) 23.2 (psi)
1.5 and 2 inch 7.3 (psi) 17.4 (psi) 26.1 (psi)
3 inch 10.2 (psi) 21.8 (psi) 33.4 (psi)
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