Pumped Liquids; Installation - Grundfos TP Serie Instrucciones De Instalación Y Funcionamiento

4.1 Pumped liquids

Thin, clean, non-aggressive and non-explosive
liquids, not containing solid particles or fibres that
may attack the pump mechanically or chemically.
Examples:
• central heating system water (the water should
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
cause
• a considerable pressure drop
• a drop in hydraulic performance
• a rise in power consumption.
In such cases, the pump should be fitted 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,
the O-rings should be chosen accordingly.

5. Installation

Warning
When pumping hot liquids, care should
be taken to ensure that persons cannot
accidentally come into contact with hot
surfaces.
The pump must be sited in a dry well ventilated, but
frost-free position.
When installing pumps with oval bolt holes in the
pump flange (PN 6/10), washers must be used as
shown in fig. 5.
Washer
Fig. 5 Use of washers for oval bolt holes
Arrows on the pump housing show the direction of
flow of liquid through the pump.
Pumps with motors smaller than 11 kW can be
installed in horizontal or vertical pipework.
Pumps with motors of 11 kW and up may only be
installed in horizontal pipework with the motor in
vertical position.
The motor must never fall below the
Caution
horizontal plane.
12
For inspection and motor/pump head removal, the
following clearance is required above the motor:
• 300 mm for motors up to and including 4.0 kW.
• 1 metre for motors of 5.5 kW and up.
See fig. 6.
Fig. 6
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. 7.
The automatic air vent is not supplied with the pump.
Fig. 7
If the liquid temperature falls below the ambient
temperature, condensation may form in the motor
during inactivity. In this case, it must be ensured that
the drain hole in the motor flange is open and points
downwards. See fig. 8.
Installation
Pump
Fig. 8
If twin-head pumps are used for pumping liquids with
a temperature below 0 °C/32 °F, condensed water
may freeze and cause the coupling to get stuck. The
problem can be remedied by installing heating
elements. Whenever possible (pumps with motors
smaller than 11 kW), the pump should be installed
with the motor shaft in horizontal position. See fig. 7.
Caution
0.25 - 4.0 kW
0.25 - 4.0 kW
300 mm
Required clearance above the motor
Automatic air vent
Drain hole
Drain hole in motor flange
The technical data in section 9. must be
observed.
5.5 - kW
5.5 kW and up
1 m