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6.3 Pumped liquids
For information about pressures and
temperatures, see section
In heating systems, the water must meet the
requirements of accepted standards on water
quality in heating systems.
The pump is suitable for the following liquids:
•
Thin, clean, non-aggressive and non-
explosive liquids, not containing solid
particles or fibers.
•
Cooling liquids, not containing mineral oil.
•
Domestic hot water
Maximum: 14 °dH
Maximum: 149 °F (65 °C)
Maximum peak: 158 °F (70 °C).
For water with a higher degree of hardness,
contact Grundfos.
•
Softened water.
The kinematic viscosity of water is 1 mm
2
/s (1
cSt) at 68 °F (20 °C). If the pump is used for a
liquid with a higher viscosity, the hydraulic
performance of the pump will be reduced.
Example: 50 % glycol at 68 °F (20 °C) means a
viscosity of approximately 10 mm
2
/s (10 cSt)
and a reduction of the pump performance by
approximately 15 %.
Do not use additives that can or will disturb the
functionality of the pump.
When selecting a pump, take the viscosity of the
pumped liquid into consideration.
For technical data, see section
6.3.1 Glycol
The pump is designed for pumping clean water,
or up to 50/50 mixtures by weight of glycol and
water.
For glycol usage as well as additional liquid
information, see section
To prevent the glycol mixture from degrading,
avoid temperatures exceeding the rated liquid
temperature and minimize the operating time at
high temperatures.
It is important to clean and flush the system
before adding the glycol mixture.
To prevent corrosion or precipitation, check the
glycol mixture and maintain it regularly. If further
dilution of the supplied glycol is required, follow
the glycol supplier's instructions.
CAUTION
Flammable material
Minor or moderate personal injury.
- Do not use the pump for flammable
liquids, such as diesel oil and
petrol.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the
temperature of the pumped liquid
must always be above 122 °F (50
°C) due to the risk of legionella.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the
pump is permanently connected to
the mains water. Therefore, do not
connect the pump by a hose.
CAUTION
Corrosive substance
Minor or moderate personal injury.
- Do not use the pump for aggressive
liquids, such as acids and
seawater.
