Construction - Grundfos MAGNA3 Manual

MAGNA3

6. Construction

MAGNA3 is of the canned-rotor type, i.e. the pump and
motor form an integral unit without shaft seal and with
only two gaskets for sealing. The bearings are
lubricated by the pumped liquid.
The pump is characterized by the following:
• controller integrated in the control box
• operating panel on the control box
• control box prepared for optional CIM modules
• built-in differential-pressure and temperature sensor
• cast-iron or stainless-steel pump housing
• twin-head versions
• no external motor protection required
• insulating shells supplied with single-head pumps
for heating systems.
Motor and electronic controller
MAGNA3 incorporates a 4-pole synchronous,
permanent-magnet motor (PM motor). This motor type
is characterized by higher efficiency than a
conventional asynchronous squirrel-cage motor.
The pump speed is controlled by an integrated variable
frequency drive.
Differential-pressure and temperature
sensor
Sensor specifications, temperature
Temperature range during operation
+14 to +95 °F (-10 to +35 °C)
+95 to +194 °F (+35 to +90 °C)
+194 to +230 °F (+90 to +110 °C)
Surface treatment
The pump housing and pump head are electrocoated
to improve corrosion resistance.
Electrocoating includes:
• alkaline cleaning
• pretreatment with zinc phosphate coating
• cathodic electrocoating (epoxy)
• curing of paint film at 392 to 482 °F (200 to 250 °C).
The pump housing of stainless-steel versions is not
treated or painted and appears in blank steel. See fig.
48.
Fig. 48 MAGNA3 stainless steel version
Color
Color codes for the pump:
Accuracy
± 7 °F (± 4 °C)
± 3.5 °F (± 2 °C)
± 7 °F (± 4 °C)
Color Code
Red NCS40-50R
Black NCS9000
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