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5
5. Applications
The pumps are designed to circulate hot or cold water in
residential, institutional and industrial applications:
• heating systems
• district heating plants
• central heating systems for blocks of flats
• air-conditioning systems
• cooling systems.
In addition, the pumps are used for liquid transfer and water
supply in for instance:
• washing systems
• domestic hot-water systems
• industrial systems in general.
To ensure optimum operation, the dimensioning range of the
system must fall within the performance range of the pump.
5.1 Pumped liquids
The pump is suitable for thin, clean, non-aggressive and
non-flammable liquids, not containing solid particles or fibres that
may attack the pump mechanically or chemically.
Examples:
• Central heating system water (the water must meet the
requirements of accepted standards on water quality in
heating systems)
• cooling liquids
• domestic hot water
• industrial liquids
• softened water.
The pumping of liquids with a density and/or kinematic viscosity
higher than that of water will have the following effects:
• a considerable pressure drop
• a drop in hydraulic performance
• a rise in power consumption.
In such cases, fit the pump with a bigger motor. If in doubt,
contact Grundfos.
The EPDM O-rings fitted as standard are primarily suitable for
water.
If the water contains mineral/synthetic oils or chemicals or if other
liquids than water are pumped, chose the O-rings accordingly.
6. Mechanical installation
Install the pump in a dry well-ventilated, but frost-free position.
When installing pumps with oval bolt holes in the pump flange
(PN 6/10), use washers as shown in fig. 3.
Fig. 3 Use of washers for oval bolt holes
Arrows on the pump housing show the direction of flow of liquid
through the pump.
The pump can be installed in horizontal or vertical pipes.
For inspection and removal of motor or pump head, a clearance
of 300 mm is required above the motor. See fig. 4.
Fig. 4 Required clearance above the motor
Twin-head pumps installed in horizontal pipes must be fitted with
an automatic air vent in the upper part of the pump housing. See
fig. 5.
The automatic air vent is not supplied with the pump.
Fig. 5 Automatic air vent
Warning
If the pump is used for a liquid which is injurious to
health, it will be classified as contaminated. In such
cases, take proper precautions to avoid injury to
health when operating or working on the pump.
Warning
When pumping hot or cold liquids, make sure that
persons cannot accidentally come into contact with
hot or cold surfaces.
In order to maintain the UL mark, follow the
additional installation procedures. See page 66.
TM01 0683 1997
The motor must never fall below the horizontal plane.
TM05 7916 1613TM05 7983 1713
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