Brochure

Operating conditions
MAGNA3
6
12
6. Operating conditions
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 +149 °F (+65 °C) to
eliminate the risk of lime precipitation.
The MAGNA3 pumps 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 is controlled by 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.
General recommendations
Temperatures
Liquid temperature
Ambient temperature
Pressures
Maximum operating pressure
175 psi (12 bar).
Minimum inlet pressure
The following relative minimum pressure must be
available at the pump inlet during operation to avoid
cavitation noise and damage to the pump bearings.
The values in the table below apply to single-head
pumps and twin-head pumps in single-head operation.
In the case of twin-head operation, the required
relative inlet pressure must be increased by 1.45 psi
(0.1 bar) compared to the stated values for single-head
pumps or twin-head pumps in single-head operation.
Note: Actual inlet pressure plus pump pressure
against a closed valve must be lower than the
maximum permissible system pressure.
The relative minimum inlet pressures apply to pumps
installed up to 984 ft (300 m) above sea level. For
altitudes above 984 ft (300 m), the required relative
inlet pressure must be increased by 1.45 psi per 330 ft
(0.1 bar / 0.01 MPa per 100 m) altitude. The MAGNA3
pump is only approved for an altitude of 6560 ft
(2000 m).
Water in heating
systems
Water quality according to local standards
Domestic hot water Degree of hardness up to 14 °dH
Water containing
glycol
Maximum viscosity = 50 cSt ~ 50 % water /
50 % ethylene glycol at +14 °F (-10 °C)
Application Temperature range
General +14 to +230 °F (-10 to +110 °C)
Domestic hot water systems
+150 °F (Up to +65 °C)
recommended
Ambient conditions
Ambient temperature during
operation
+32 to +140 °F (0 to +40 °C)
Ambient temperature during
storage and transport
-40 to +158 °F (-40 to +70 °C)
Relative air humidity Maximum 95 %
MAGNA3
DN
Liquid temperature
[167 °F (75 °C)] [203 °F (95 °C)] [230 °F (110 °C)]
Inlet pressure [psi (bar)]
32-60/100 1.5 (0.10) 5.0 (0.35) 14.5 (1.0)
40-80 1.5 (0.10) 7.3 (0.50) 16.0 (1.1)
40-120/
150/180
1.5 (0.10) 5.8 (0.40) 14.5 (1.0)
50-80 1.5 (0.10) 1.5 (0.10) 10.2 (0.7)
50-150 2.9 (0.20) 8.7 (0.60) 17.4 (1.2)
65-120 1.5 (0.10) 7.3 (0.50) 16.0 (1.1)
65-150 5.8 (0.40) 11.6 (0.80) 17.4 (1.2)
80-100 7.3 (0.50) 13.1 (0.90) 21.8 (1.5)
100-120 7.3 (0.50) 13.1 (0.90) 21.8 (1.5)