Grundfos ALPHA+ 15-40, Installation And Operating Instructions Manual

Page: 5 / 272

5
GRUNDFOS ALPHA+ is suitable for:
• systems with constant or variable flows
where it is desirable to optimise the setting of
the pump duty point,
• systems with variable flow-pipe tempera-
ture and
• systems where night-time duty is desired.
2.1 Pumped liquids
Thin, clean, non-aggressive and non-explosive
liquids, not containing solid particles, fibres or
mineral oil.
In heating systems , the water should meet the
requirements of accepted standards on water
quality in heating systems, e.g. the German
standard VDI 2035.
In domestic hot-water systems , it is advisable
to use GRUNDFOS ALPHA+ pumps only for
water with a degree of hardness lower than
approx. 14°dH. For water with a higher degree
of hardness a direct-coupled TPE pump is
recommended.
3. Installation
The pump must be installed with the motor
shaft horizontal, see
n
, page 261.
Arrows on the pump housing indicate the liquid
flow direction through the pump.
See mounting dimensions at the end of these
instructions.
The pump must not be used for the
transfer of inflammable liquids such
as diesel oil, petrol or similar liquids.
Care should be taken to ensure that
persons cannot accidentally come
into contact with hot surfaces of the
pump.