Grundfos magna3 User Manual

Functions
MAGNA3
4
19
Proportional pressure
Proportional pressure is suitable in systems with
relatively large pressure losses in the distribution pipes
and in air-conditioning and cooling systems:
• Two-pipe heating systems with thermostatic valves
and the following:
– very long distribution pipes
– strongly throttled pipe balancing valves
– differential-pressure regulators
– large pressure losses in the parts of the system
through which the entire amount of water flows,
for example a boiler, heat exchanger and
distribution pipe up to the first branching.
• Primary circuit pumps in systems with large
pressure losses in the primary circuit.
• Air-conditioning systems with the following:
– heat exchangers (fan coils)
– cooling ceilings
– cooling surfaces.
Characteristics and key benefits
• The head of the pump increases proportionally to
the flow rate in the system.
• Compensates for large pressure losses in the
distribution pipes.
Technical specifications
Fig. 18 Proportional-pressure control
The head against a closed valve is half the setpoint
H
set
.
Constant pressure
A constant pressure is advantageous in systems with
relatively small pressure losses in the distribution pipes:
• Two-pipe heating systems with thermostatic valves:
– dimensioned for natural circulation
– small pressure losses in the parts of the system
through which the entire amount of water flows,
for example a boiler, heat exchanger and
distribution pipe up to the first branching.
– modified to a high differential temperature
between the flow pipe and the return pipe (for
example district heating).
• Underfloor heating systems with thermostatic
valves.
• One-pipe heating systems with thermostatic valves
or pipe balancing valves.
• Primary circuit pumps in systems with small
pressure losses in the primary circuit.
Characteristics and key benefits
• The pump pressure is kept constant, independent of
the flow in the system.
Technical specifications
Fig. 19 Constant-pressure control
TM05 2448 1212
H
Q
H
set
H
set
2
TM05 2449 0312
H
Q

Grundfos magna3 Specifications

General

Liquid Temperature Range	-10°C to +110°C
Max Operating Pressure	16 bar
Type	Circulator Pump
Series	MAGNA3
Operating Temperature Range	-10°C to +110°C
Ambient Temperature Range	0°C to +40°C
Protection Class	IPX4D
Power Supply	1 x 230 V, 3 x 230 V, 3 x 400 V
Control Mode	Constant pressure, Proportional pressure
Communication	Modbus RTU
Pump Housing	Cast Iron
Impeller	Composite
Enclosure Class	X4D
Approvals	CE, EAC
Connection	Flange
Weight	Varies depending on model
Power Consumption	Varies depending on model