Installation; Pumped Liquids - Grundfos Medium UPM Series Data Booklet

Medium UPM

8. Installation

Installation must be carried out by
trained persons in accordance with local
regulations.

Pumped liquids

The pump must not be used for
circulation of flammable liquids such as
diesel oil and petrol.
Risk of malfunction or damage when
inhibitors or additives are added to the
pumped liquids.
Medium UPM pumps are suitable for the following
liquids:
• Clean, thin, non-aggressive and non-explosive
liquids, not containing solid particles or fibres.
• In heating systems, the water must meet the
requirements of accepted standards on water
quality in heating systems, for example the German
standard VDI 2035.
• The pH must be between 8.2 and 9.5. The minimum
value depends on the water hardness and must not
be below 7.4 at 4 °dH (0.712 mmol/l).
• The electrical conductivity at 25 °C must be ≥ 10
microS/cm.
• For drinking water systems, approved housings
must be used, such as stainless steel N. These
pumps and their components in contact with water
are approved by WRAS (GB), ACS (FR), KTW (DE)
and DIN DVGW W270 (DE).
• In domestic hot-water systems, the pump must be
used only for water with a degree of temporary
hardness of less than 3 mmol/l CaCO3 (16.8 ° dH).
To avoid lime problems in hard waters, the medium
temperature must not exceed 65 °C.
• The water quality of test beds for the final
production tests of complete heating appliances
including pump must be observed to avoid
calcification or biofilm formation during a longer
storage period.
• Solar media as used in typical solar thermal
systems containing up to 50 Vol % of antifreeze
media.
• Mixtures of water with antifreeze media such as
glycol or ethanol (down to -10 °C with a validated
temperature profile) with a kinematic viscosity lower
2
than 15 mm /s (15 cSt).
Antifreeze media containing glycol
When selecting a pump, the viscosity of the pumped
liquid must be taken into consideration. Depending on
the type of glycol, the mixture and the liquid
temperature, the viscosity increases differently
compared to water as a medium. This will influence the
pressure loss of the system as well as the efficiency,
performance and load of the pump. As the pump is
controlled by a power limitation function that protects
against overload, the maximum curve might be lower.
Example:
If the water-glycol mixture is 50 %, and the liquid
temperature is +2 °C, the viscosity is 15 cSt:
The maximum head falls 1.0 to 1.5 m compared to 100
% water at 60 °C (at the same flow).
Performance curves measured with a medium
containing glycol at higher viscosity than water are
different from the water curves in this data booklet and
can be taken into account by adding these mark-up
factors to the required duty point:
Pumped
Viscosity Density
liquid at
2 3
[mm /s] [kg/m ]
-7 °C
Ethylene glycol
50 % 10.20 1083
30 % 5.18 1054
25 % 4.37 1046
Propylene glycol
50 % 26.90 1056
30 % 9.71 1038
25 % 7.34 1033
Ethanol
50 % 10.20 932
30 % 11.00 972
25 % 9.61 980
H Q P
mark up mark up mark up
[%] [%] [%]
7 10 18
3 7 9
2 5 8
14 15 19
7 8 8
4 5 7
4 10 2
4 8 3
4 7 4
8
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