Product Introduction; Applications; Pumped Liquids - Grundfos MAGNA1 Installation And Operating Instructions Manual

6. Product introduction

Grundfos MAGNA1 is a complete range of circulator pumps with
integrated controller enabling adjustment of pump performance to
the actual system requirements. In many systems, this reduces
the power consumption considerably, reduces noise from
thermostatic radiator valves and similar fittings and improves the
control of the system.
You can set the desired head on the control panel.

6.1 Applications

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

6.2 Pumped liquids

The pump is suitable for thin, clean, non-aggressive and
non-explosive liquids, not containing solid particles or fibres that
may attack the pump mechanically or chemically.
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 pumps are also suitable for domestic hot-water systems.
Observe local regulation regarding pump-housing
material.
We strongly recommend that you use stainless-steel pumps in
domestic hot-water applications to avoid corrosion.
In domestic hot-water systems, we recommend that you use the
pump only for water with a degree of hardness lower than
approximately 14 °dH.
In domestic hot-water systems, we recommend that you keep the
liquid temperature below 65 °C to eliminate the risk of lime
precipitation.
Do not pump aggressive liquids.
Do not pump flammable, combustible or explosive
liquids.
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6.2.1 Glycol
You can use the pump for pumping water-ethylene-glycol
mixtures up to 50 %.
Example of a water-ethylene-glycol mixture:
Maximum viscosity: 50 cSt ~ 50 % water / 50 % glycol mixture at
-10 °C.
The pump has a power-limiting function that protects it against
overload.
The pumping of glycol mixtures affects the maximum curve and
reduces the performance, depending on the
water-ethylene-glycol mixture and the liquid temperature.
To prevent the glycol mixture from degrading, avoid temperatures
exceeding the rated liquid temperature and minimise the
operating time at high temperatures.
Clean and flush the system before you add the glycol mixture.
To prevent corrosion or lime precipitation, check and maintain the
glycol mixture regularly. If further dilution of the supplied glycol is
required, follow the glycol supplier's instructions.
Additives with a density and/or kinematic viscosity
higher than those/that of water reduce the hydraulic
performance
Max. 95 % RH
IPX4D
Fig. 17 Pumped liquids
You can connect the pump to the power supply in two ways, that
is via terminals and via plug. These options are available for both
flanged and threaded versions.