Grundfos MAGNA3 25-100 (N) User manual

GRUNDFOS DATA BOOKLET
MAGNA3
From Model D
Circulator pumps
50/60 Hz

Table of contents
2
MAGNA3
1. Product description 3
Type key 4
Model type 4
Pump heads in twin-head pumps 4
Performance range, MAGNA3 5
Performance range, MAGNA3 D single-head operation
5
Performance range, MAGNA3 D twin-head operation
6
2. Product range 7
3. System applications 9
Heating systems 9
Cooling systems 11
Solar-heating systems 13
4. Functions 14
Control modes: Quick overview 15
Operating modes 17
Control modes 17
Additional control mode features 22
Multipump modes 23
Flow estimation accuracy 24
Readings and settings on the pump 25
Communication 27
5. Operating conditions 32
General recommendations 32
Pumped liquids 33
Electrical data 34
6. Construction 35
7. Installation 37
Mechanical installation 37
Electrical installation 37
Connection to power supply, terminal-connected
versions 38
8. Curve conditions 40
Performance curves 40
Energy efficiency index (EEI) 40
QR code on the pump nameplate 40
Markings and approvals 41
9. Performance curves and technical data 42
10. Accessories 57
Insulating kits for air-conditioning and cooling systems
57
CIM modules 57
Grundfos GO 58
External Grundfos sensors 59
Cable for sensors 60
Blanking flange 60
Pipe connections 61
11. Product numbers 62
Single-head pumps 62
Twin-head pumps 62
12. Grundfos Product Center 63

Product description
MAGNA3 1
3
1. Product description
The Grundfos MAGNA3 model D circulator pumps are
designed for circulating liquids in systems with variable
flow requirements where you want to optimize the
setting of the pump duty point, thus reducing energy
costs.
Applications
• Heating systems
– main pump
– mixing loops
– heating surfaces
• air-conditioning and cooling systems
• domestic hot-water systems
• ground source heat-pump systems
• solar-heating systems.
The MAGNA3 circulator pump is perfect for both new
systems as well as for replacement. The pump is ideal
when operating in systems requiring an automated
adjustment of pressure. This pump range is the best
choice as it eliminates the need for expensive bypass
valves and similar components.
Furthermore, the pump is appropriate for systems with
hot-water priority as an external signal can
immediately force the pump to operate according to
the maximum curve, for example in solar-heating
systems. When using the pumps in domestic hot-water
systems, please observe local legislation regarding
pump house material. Grundfos strongly recommends
that you use stainless-steel pumps in domestic
hot-water applications to avoid corrosion.
Duty range
To ensure correct operation, it is important that the
duty points in the system match the duty range of the
pump.
Characteristic features
•AUTO
ADAPT.
•FLOW
LIMIT.
•FLOW
ADAPT - a combination of the AUTOADAPT
control mode and FLOWLIMIT function.
• Built-in Grundfos differential-pressure and
temperature sensor.
• Proportional-pressure control.
• Constant-pressure control.
• Constant-temperature control.
• Constant-curve duty.
• Maximum or minimum curve duty.
• Automatic night setback.
• Self-explanatory user interface with TFT display and
high quality silicone push-buttons.
• Heat energy monitor.
• Wireless multipump function.
The complete range is available for a maximum
system pressure of 175 psi (12 bar, 1.2 MPa), PN 12.
Benefits
• Low energy consumption due to the AUTOADAPT
function, allowing the pump to adjust automatically
to external factors, such as outside temperatures
and consumption patterns.
• Simple installation.
• No maintenance and long life.
• Operating log history.
• Easy and simple system optimization.
• External control and monitoring enabled via add-on
modules.
• No external motor protection required.
• Insulating shells for heating systems supplied with
single-head pumps.
• Wide temperature range due to thermal separation
of the control box and pump media.
TM05 8894 2813
Data MAGNA3 (N) Single-head
pumps
MAGNA3 D
Twin-head
pumps
Maximum flow rate 345 gpm
(78.5 m3/h)
484 gpm
(110 m3/h)
Maximum head 60 ft (18 m)
Maximum system pressure 175 psi (1.2 MPa) (12 bar)
Liquid temperature 14 to 230 °F (-10 to +110 °C)

Product description
MAGNA3
1
4
Type key
Model type
This data booklet covers MAGNA3 from model D. The
model version is stated on the nameplate. See fig. 1.
Fig. 1 Model type on pump nameplate
Pump heads in twin-head pumps
The twin-head pump housing has a flap valve on the
outlet side. The flap valve seals off the port of the idle
pump housing to prevent the pumped liquid from
running back to the inlet side. See fig. 2. Due to the
flap valve, there is a difference in the hydraulics
between the two heads. See fig. 3.
Fig. 2 Twin-head pump housing with flap valve
Fig. 3 Hydraulic difference between the two heads
Code Example MAGNA3 (D) 80 -120 (F) (N) 360
Type range
MAGNA3
D
Single-head pump
Twin-head pump
Nominal diameter (DN) of inlet and outlet ports [mm]
Maximum head [dm]
F
Pipe connection
Flange
N
Pump housing material
Cast iron
Stainless steel
Port-to-port length [mm]
TM06 7734 4017
TM06 1565 2514TM06 1566 2514
H
Q
Right pump head
Left pump head

Product description
MAGNA3 1
5
Performance range, MAGNA3
Fig. 4 Performance range, MAGNA3
Performance range, MAGNA3 D single-head operation
Fig. 5 Performance range, MAGNA3 D single-head operation
TM05 7654 2818
10 15 20 30 40 50 60 70 80 100 150 200 300 400
Q [US GPM]
6
8
10
12
15
20
30
40
50
60
[ft]
H
34567891010 20 30 40 50 60 Q [m³/h]
2
3
4
5
6
7
8
9
1010
[m]
H
MAGNA3
100-120
80-100
65-120
65-150
50-150
50-80
40-120
40-180
40-80
32-100
32-60
TM05 7655 2818
10 15 20 30 40 50 60 70 80 100 150 200 300 400
Q [US GPM]
10
15
20
25
30
40
50
[ft]
H
34567891010 20 30 40 50 60 Q [m³/h]
4
5
6
7
8
9
1010
[m]
H
MAGNA3 D
100-120
65-150
80-100