Grundfos MAGNA3 25-100 (N) Bedienungsanleitung

GRUNDFOS DATA BOOKLET

MAGNA3

From Model D

Circulator pumps

50/60 Hz

Table of contents

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

Performance range, MAGNA3 D twin-head operation

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

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

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

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

Single-head pump

Twin-head pump

Nominal diameter (DN) of inlet and outlet ports [mm]

Maximum head [dm]

Pipe connection

Flange

Pump housing material

Cast iron

Stainless steel

Port-to-port length [mm]

TM06 7734 4017

TM06 1565 2514TM06 1566 2514

Right pump head

Left pump head

Product description

MAGNA3 1

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]

[ft]

34567891010 20 30 40 50 60 Q [m³/h]

1010

[m]

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]

[ft]

34567891010 20 30 40 50 60 Q [m³/h]

1010

[m]

MAGNA3 D

100-120

65-150

80-100

Product description

MAGNA3

Performance range, MAGNA3 D twin-head operation

Fig. 6 Performance range, MAGNA3 D twin-head operation

TM05 7656 2818

10 15 20 30 40 60 80 100 150 200 300 400 600

Q [US GPM]

[ft]

34567891010 20 30 40 50 60 70 80 90 Q [m³/h]

1010

[m]

MAGNA3 D

100-120

65-150

80-100

Product range

MAGNA3 2

2. Product range

Pump selection

All pumps have a "best point" (ηmax), indicating where

the pump is working most efficiently.

Consider the parameters in the following section.

Pump size

The system characteristic is used together with the

performance curve of the pump for sizing and correct

pump selection.

The selection of pump size must be based on the

following:

• required maximum flow

• maximum pressure loss in the system.

Refer to the system characteristics to determine the

duty point. See fig. 7.

Fig. 7 System characteristic

Operating conditions

You must check whether the operating conditions are

fulfilled, i.e:

• liquid quality and temperature

• ambient conditions

• minimum inlet pressure

• maximum operating pressure.

See also Operating conditions, page 32.

Closed valve operation

A MAGNA3 pump can operate at any speed against a

closed valve for several days without damage to the

pump. However, Grundfos recommends to operate at

the lowest possible speed curve to minimize energy

losses. There are no minimum flow requirements.

Note: Do not close inlet and outlet valves

simultaneously, always keep one open when the pump

is running. Media- and ambient temperatures must

never exceed the specified temperature range.

Cast iron Stainless steel (N) Page reference

115 V 230 V 115 V 230 V

Single-head pump models

MAGNA3 32-60 F (N) 98126820 98126822 43

MAGNA3 32-100 F (N) 98126824 98126826 44

MAGNA3 40-80 F (N) 98126800 98126828 98126802 98126830 45

MAGNA3 40-120 F (N) 98126804 98126832 98126806 98126834 46

MAGNA3 40-180 F (N) 98126808 98126836 98126810 98126838 47

MAGNA3 50-80 F (N) 98126812 98126840 98126814 98126842 48

MAGNA3 50-150 F (N) 98126816 98126844 98126818 98126846 49

MAGNA3 65-120 F (N) 98124696 98126848 98124702 98126850 50

MAGNA3 65-150 F (N) - 98126852 - 98126854 51

MAGNA3 80-100 F (N) - 98126856 - 98126858 53

MAGNA3 100-120 F (N) - 98126860 - 98126862 55

Twin-head pump models

MAGNA3 D 65-150 F - 98126863 - - 52

MAGNA3 D 80-100 F - 98126864 - - 54

MAGNA3 D 100-120 F - 98126865 - - 56

TM02 2040 3301

Duty point

Product range

MAGNA3

Control modes

•AUTO

ADAPT (factory setting) which is suitable for

most installations.

•FLOW

ADAPT in systems where flow limitation is

required.

• Proportional-pressure control in systems with

considerable pressure losses in relation to large

flow variations.

• Constant-pressure control in systems with

insignificant pressure losses in relation to large flow

variations.

• Constant-temperature control in heating systems

with a fixed system characteristic, for example

domestic hot-water systems.

• Differential-temperature control in heating and

cooling systems.

• Constant-curve duty.

For further information on control and operating

modes, see Functions, page 14.

Automatic determination of the setpoint

If you know the duty point, you can enter the value on

the display when setting the pump. The pump then

automatically calculates the corresponding setpoint.

See fig. 8.

Fig. 8 Example of setpoint calculation based on a chosen

control mode and entered Q and H values

Communication

The Grundfos CIM modules (Communication Interface

Module) enable the MAGNA3 to connect to standard

fieldbus networks, offering substantial benefits:

• complete process control and monitoring

• modular design, prepared for future requirements

• based on standard functional profiles

• simple configuration and easy installation

• open communication standards

• reading warning and alarm indications.

For further details, see CIM modules, page 27.

Fig. 9 Example of a typical building management system

(BMS)

Note: A gateway is a device that facilitates the transfer

of data between two different networks based on

different communication protocols.

4.1.1.0.0.0 - 13A4.1.1.0.0.0 - 13B

TM05 2710 1112

System applications

MAGNA3 3

3. System applications

Heating systems

Fig. 10 Functional drawing of a heating system in a commercial building

TM07 0360 1218

MMMMM

567

Pos. Description

1 Hot water

A Charging pump

B Recirculation

2 Hot water

C Recirculation

3 Air handling unit

4 Fan coil unit

5 Radiator two-pipe system

6 Radiator one-pipe system

7 Underfloor/ceiling

8 Boiler pump

D Shunt/buffer

E "Primary only" system

System applications

MAGNA3

Main pumps

Due to variations in the heat demand and flow rate, we

always recommend that you use speed-controlled

MAGNA3 pumps in a heating system, either

single-head pumps connected in parallel or twin-head

pumps. Single-head pumps connected in parallel have

several advantages. In alternating operation, each

pump is sized for 100 % flow. In this operating mode,

the second pump functions as backup for higher

reliability. As the pumps alternate, an equal number of

operating hours is ensured. Cascade operation of

pumps connected in parallel meets demands in

high-flow systems with low differential temperature

(∆t), and 50 % backup is ensured at the same time.

The twin-head pump saves installation time and costs.

By speed-controlling all pumps, you can obtain

maximum energy saving as the pumps will run at their

best efficiency point (BEP).

In a variable-flow system, we recommend that you

control the main pump in AUTOADAPT or proportional-

pressure mode.

However, if a load (e.g. a radiator) is far from the

pump, it can be advantageous to install a differential

pressure sensor across this load and use a setpoint for

differential pressure.

By using the FLOWADAPT function to ensure correct

balancing of the system, the need for pump throttling

valves can be reduced significantly.

The built-in heat energy monitor allows monitoring of

the heat energy consumption in the system only for

optimization purposes.

Air handler heating coils

The performance of heating surfaces is controlled by

the heating-water temperature and the flow rate. For

this purpose, we recommend that you install

variable-flow mixing loops at the heating surfaces. A

speed-controlled mixing-loop pump is ideal for

adaptation to the varying loads in a heating surface. In

this case, MAGNA3 will have full authority, making

external pump throttling valves superfluous.

Domestic hot water

For domestic hot-water circulation, the

constant-temperature control mode will ensure a

constant temperature in the recirculation pipe, without

the use of separate thermostatic valves, thus obtaining

maximum comfort.

Mixing loops

Due to variations in use, flow-pipe temperature and

heat demand in different parts of the building, the

heating system must be divided into zones controlled

by independent mixing loops. Due to the flow

variations, a speed-controlled mixing-loop pump will

have authority in the system. This will help obtain a

better hydraulic balance in the overall system. Speed

control of the pump via selection of a control mode,

depending on system application, ensures maximum

energy saving. See Control modes, page 17.

Advantages of using mixing loops:

• Reduced excessive differential pressure in the

system and hereby reduced risk of overflow

• increased control ability as the loop is provided with

the exact flow rate and temperature demand.

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