General Information; Applications; Pumped Liquids - Grundfos MAGNA3 Manual De Instrucciones

3. General information

The Grundfos MAGNA3 is a complete range of circulator pumps
with integrated controller enabling adjustment of pump
performance to the actual system requirements. In many
systems, this will reduce the power consumption considerably,
reduce noise from thermostatic radiator valves and similar fittings
and improve the control of the system.
The desired head can be set on the pump control panel.

3.1 Applications

The Grundfos MAGNA3 is designed for circulating liquids in the
following systems:
• heating systems
• domestic hot-water systems
• air-conditioning and cooling systems.
The pump can also be used in the following systems:
• ground source heat pump systems
• solar-heating systems.

3.2 Pumped liquids

The pump is suitable for thin, clean, non-aggressive and
non-explosive liquids, not containing solid particles or fibers that
may attack the pump mechanically or chemically.
In heating systems, the water should meet the requirements of
accepted standards on water quality in heating systems.
In domestic hot-water systems, we recommend to use MAGNA3
pumps only for water with a degree of hardness lower than
approx. 14 °dH.
In domestic hot-water systems, we recommend to keep the liquid
temperature below 150 °F (+65 °C) to eliminate the risk of lime
precipitation.
Warning
Do not use the pump for flammable liquids, such
as diesel oil and gasoline.
Warning
Do not use the pump for aggressive liquids, such
as acids and sea water.
6
Max. 95 % RH
Enclosure Type 2
Fig. 1 Pumped liquids
3.2.1 Glycol
The pump can be used for pumping water/glycol mixtures up to
50 %.
Example of a water/ethylene glycol mixture:
Maximum viscosity: 50 cSt ~ 50 % water / 50 % ethylene glycol
mixture at +14 °F (-10 °C).
The pump has a power-limiting function that protects against
overload.
The pumping of glycol mixtures will affect the max. curve and
reduce the performance, depending on the water/ethylene glycol
mixture and the liquid temperature.
To prevent the ethylene 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 the ethylene
glycol mixture is added.
To prevent corrosion or lime precipitation, check and maintain the
ethylene glycol mixture regularly. If further dilution of the supplied
ethylene glycol is required, follow the glycol supplier's
instructions.
Additives with a density and/or kinematic
Note
Note
viscosity higher than those/that of water will
reduce the hydraulic performance.