Abnormal Operating Conditions; Electrical Wiring - Solar Energy WILO ST 15/6 Bedienungsanleitung

*These values are valid up to 300m above sea level.
For higher elevations add: 0,01 bar/100m .
The minimum inlet pressure must be maintained in order to avoid cavitations' noise.
Permissible fluids:
Water and water/glycol mixtures up to a ratio of 1:1. Glycol mixtures require a reassessment
of pump hydraulic data in line with the increased viscosity and depending on mixing ratios.
Only approved marks of additives with corrosion inhibitors must be used in strict compliance
with manufacturers´ instructions.
2. Safety Rules
2.1 Safety Rules For The Operator
Local regulations for the prevention of accidents must be observed. Danger from electrical
energy must be excluded (conforming to local or general regulations such as IEC, VDE, etc.)
2.2 Safety Rules for Inspections and Installation Work
It is the operator´s responsibility to ensure that inspections and installation work are carried
out by authorized and qualified personnel only, having themselves made fully conversant
with these instructions. Work must principally be carried out only with the plant switched off
and at complete standstill.

2.3 Abnormal Operating Conditions

Operational safety of the plant is only ensured if used in accordance with these instructions.
The limits stated there must not be exceeded under any circumstances.
3. Description of Product and Accessories
The pump ST/STL is a solar thermal pump with special hydraulic (pump housing coated) for
using in solar thermal systems. Motor overload protection is not required. The motor
operates non-overloading. Speed setting: All pumps are equipped with a rotary switch in the
terminal box to enable manual 3-speed control (1 = min) (2-3 = max). At minimum speed the
maximum speed is reduced to approx. 40...50%. The power input is reduced to
approximately 50%.
4. Sitting/Installation
4.1 Installation
- Direction of fluid flow must correspond with the arrow on the pump housing
(Fig. 2, pos. 1).
- If using pump housings with integrated exhaust cavity it must be observed that the
connection for the vent or the vent pipe is vertical (12h position).
- When connecting the pump to the conduit of pipes, the pump can be secured against
twisting using a spanner on the key surfaces which have been created for this
purpose (Fig. 3)

4.2 Electrical wiring

- Cable leads to be routed in such a way to avoid any contact with pipe work and/or
pump or stator housings.
- Check that the mains current and voltage comply with the data on the rating plate.
- Effect all wiring according to Wiring diagram (Fig. 4).
- Pump/installation must be earthed in compliance with regulations.
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