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GRUNDFOS DATA BOOKLET

GRUNDFOS ALPHA+Circulator pumps

50 Hz

2

Contents

General dataCirculator pumps 3Type key 3Performance range 3Applications 4Control of heating systems 4Advantages of pump control 5Electrical data 5Construction 5Sectional drawing 6Motor and terminal box 6Pump housing with air separator 7Installation 7Start-up 7Pumped liquids 7Liquid temperature 7System pressure 7Inlet pressure 8Setting of pump head 8Curve conditions 8

Technical dataALPHA+ 15-40, 25-40, 32-40 9ALPHA+ 15-60, 25-60, 32-60 10ALPHA+ 25-40 A 11ALPHA+ 25-60 A 11

AccessoriesUnion and valve kits 12Insulation kits 12Service kit 12

Further product documentationWinCAPS 13WebCAPS 14

General data
Circulator pumpsGRUNDFOS ALPHA+ is a complete range of circulator pumps with integrated differential-pressure control enabling adjustment of pump performance to the actual system requirements. In many systems, this means a considerable reduction in power consumption, mini-mises noise from thermostatic valves and similar fittings, and improves the control of the system.

GRUNDFOS ALPHA+ is energy-optimised and labelled B.

The B energy label indicates the energy-saving level of the pump. The energy classification system has seven levels, i.e. from A to G. Level A is the best.

The GRUNDFOS ALPHA+ offers a host of advantages:

Energy savings Automatic control of the differentialpressure.

Flexibility Suitable for installation in existingsystems.

Comfort Low-noise operation.

Security Built-in electrical and thermalprotection of the pump.

Userfriendliness Simple operation and setting.

Type key

Performance range

Fig. 1 Performance range, ALPHA+

Example ALPHA+ 25 - 40 (A) (B) 180

Type range

Nominal diameter (DN) of suction and discharge ports [mm]

Maximum head [dm]

Pump housing with air separator

Bronze pump housing

Port-to-port length [mm]

TM01

918

6 25

05

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Q [m³/h]

0

1

2

3

4

5

H[m]

0

10

20

30

40

50

p[kPa]

0.0 0.2 0.4 0.6 0.8 1.0 Q [l/s]

GRUNDFOSALPHA+

ALPHA+ XX-40

ALPHA+ XX-60

3

4

General data GRUNDCir

FOS ALPHA+culator pumps

ApplicationsGRUNDFOS ALPHA+ is designed for circulating liquids in heating systems. Pumps with bronze pump housing can also be used in domestic hot-water systems.

GRUNDFOS ALPHA+ is suitable for:

• systems with constant or variable flows where optimum setting of the pump duty point is required.

• systems with variable flow-pipe temperature.

GRUNDFOS ALPHA+ is especially suitable for:

• installation in existing systems where the differential pressure of the pump is too high during periods of reduced flow demand.

• installation in new systems for fully automatic ad-justment of the performance to flow demands with-out the use of bypass valves or similar expensive components.

Examples of systems:

Fig. 2 One-pipe heating system

Fig. 3 Two-pipe heating system

Fig. 4 Underfloor heating system

Fig. 5 Domestic hot-water system

Control of heating systemsThe heating required in a building varies greatly during the day due to changing outdoor temperatures, solar radiation and heat emanating from human beings, elec-tric appliances, etc.

Add to this that the need for heating may vary from one section of the building to another and that the thermo-static valves of some radiators may be turned down by the users.

These circumstances will cause an uncontrolled pump to produce a too high differential pressure when the heating demand is low. The consequences may be:

• too high energy consumption,• irregular control of the system and• noise in thermostatic valves and similar fittings.

The GRUNDFOS ALPHA+ automatically controls the differential pressure by adjusting the pump perform-ance to the actual heating demand, without the use of external components.

TM01

016

3 06

97TM

01 0

164

0697

TM01

016

5 06

97M

TM01

016

6 06

97

General data GRUNDFCirc

OS ALPHA+ulator pumps

Advantages of pump controlThe differential pressure is controlled by adjustment according to the flow (proportional- or constant-pres-sure control).

Contrary to an uncontrolled pump, the proportional-pressure controlled GRUNDFOS ALPHA+ reduces the differential pressure as a result of falling heating demand.

If the heating demand falls - for instance due to solar radiation - the radiator valves will close, and, for the uncontrolled pump, the flow resistance of the system will rise for instance from A1 to A2.

Fig. 6 Uncontrolled pump

In a heating system with an uncontrolled pump, this situation will cause a pressure rise in the system by ∆H1.

Fig. 7 Pump in proportional-pressure control mode

In a system with a GRUNDFOS ALPHA+ pump, the pressure will be reduced by ∆H2 compared to an uncon-trolled pump.

When using an uncontrolled pump, a pressure rise will often cause flow-generated noise in the thermostatic valves. This noise will be reduced considerably with the GRUNDFOS ALPHA+.

Electrical data

ConstructionGRUNDFOS ALPHA+ is of the canned-rotor type, i.e. 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 characterised by:

• integrated proportional-pressure control• integrated constant-pressure control• three fixed speed curves• ceramic shaft and radial bearings • carbon thrust bearing • stainless-steel rotor can, bearing plate and rotor

cladding • composite impeller• cast-iron or bronze pump housing.

TM01

911

9 50

02TM

01 9

120

5002

H

Q

∆H1

1

2

A2

A1

Q1Q2

H

Q

∆H2

1A2

A1

A3

Q1Q2

Supply voltage 1 x 230 V –10%/+6%, 50 Hz, PE

Motor protection The pump requires no external motor protection

Enclosure class IP 42 Insulation class FRelative air humidity Max. 95% Ambient temperature 0°C to +40°C Temperature class TF110 according to CEN 335-2-51EMC (electromagnetic compatibility)

EN 61 000-6-2EN 61 000-6-3

Sound pressure level ≤ 43 dB(A)

5

6



Sectional drawing

Fig. 8 Position numbers

Material specification

Motor and terminal boxThe motor is a 2-pole, asynchronous squirrel-cage motor with radio noise filter to VDE 0875. The terminal box and motor-pump unit have been tested in accord-ance with VDE 0700.

The motor of GRUNDFOS ALPHA+ is impedance-protected and therefore requires no external motor protection.

Incorporating the controller, the terminal box has a selector switch and an indicator light which is on when the electricity supply has been switched on.

The controller meets the requirements of EN 61 000-6-2 and EN 61 000-6-3.

The terminal box is fitted to the stator housing by means of screws and connected to the stator by means of a terminal plug.

Possible terminal box positions:

Fig. 9 Terminal box positions

The cable entry incorporates cable relief.

Fig. 10 Cable entry with cable relief

TM01

918

3 14

00

Pos. Description Material EN / DIN W.-Nr. AISI/ASTM

1 Controllercomplete

2Rotor can Stainless steel 1.4301 304Radial bearing Ceramic

3Shaft CeramicRotor cladding Stainless steel 1.4301 304Stop ring Composite, PES

4Thrust bearing CarbonThrust bearing retainer

Stainless steel/EPDM rubber

5 Impeller Composite, PES/PP6 Bearing plate Stainless steel 1.4301 304

7 Pump housing

Cast iron EN-GJL-150EN-GJL-200Bronze

EN-JL 1020EN-JL 10302.1176.01

A48-25 BA48-30 B

Gaskets EPDM rubber

1

5

7 6

4 23

TM02

592

1 43

02TM

01 9

184

1400

Standardposition

General data GRUNDFCirc


Pump housing with air separatorThe pump housing with air separator is installed in systems where the liquid contains so much air that a conventional circulator pump cannot start or keep up a continuous circulation.

The pump housing is available only for upward water flows.

The air-containing liquid is guided from the suction port to the nozzle of the air-separating chamber and caused to circulate considerably in the relatively large chamber, thus creating a relatively lower pressure at the back (top) of the chamber. This lower pressure combined with the reduced velocity of the liquid in the air-separating chamber will cause a separation of air from the liquid. Due to its lower density, the air will escape through an automatic air vent fitted to the air-separating chamber.

The pump housing has an Rp 3/8 tapping for fitting of an air vent. The air vent is not supplied with the pump.

Fig. 11 Pump housing with air-separating chamber

Fig. 12 Air separation

InstallationThe pump must always be installed with horizontal motor shaft.

Fig. 13 Horizontal motor shaft

Start-upThe pump must not be started until the system has been filled with liquid and vented. Furthermore, the required minimum inlet pressure must be available at the pump inlet. The system cannot be vented through the pump.

As the pump is self-venting, the pump need not be vented in connection with start-up.

Pumped liquidsThin, clean, non-aggressive and non-explosive liquids, not containing solid particles, fibres or mineral oil.

The pump must not be used for the transfer of inflam-mable liquids such as diesel oil and petrol.

Liquid temperatureCast-iron pumps: +2°C to +110°C.

Bronze pumps in domestic hot-water systems:+15°C to +60°C.

To avoid condensation in the terminal box and the stator, the pumped liquid temperature must always be higher than the ambient temperature. See table.

System pressurePN 10: Max. 1.0 MPa (10 bar).

TM01

911

7 49

02TM

00 9

101

1097

0 1 2 3 4 5 [%]

0

10

20

30

40

50

60

70

80

90

100

[%]

Luftu

dski

llels

e i %

Luftmængde i % af pumpemedie

Q=0,5 m³/h

Q=1,0 m³/h

Q=1,25 m³/h

Quantity of air as % of pumped liquid

Q = 0.5 m3/hQ = 1.0 m3/hQ = 1.25 m3/h

Air-

sepa

ratio

n as

%

TM00

036

1 51

96

Ambient temperature [°C]

Liquid temperature Min. [°C] Max. [°C]

0 2 11010 10 11020 20 11030 30 11035 35 9040 40 70

7

8



Inlet pressureTo avoid cavitation noise and damage to the pump bearings, the following minimum pressures are required at the pump suction port.

Setting of pump headWith the selector switch on the terminal box, the elec-tronically controlled pump can be set to

• two constant-pressure curves• two proportional-pressure curves• three fixed speed curves.

Factory settingThe selector switch on the pump terminal box is factory-set as shown in the table below.

This setting is suitable for 80-90% of all single-family houses.

Change of head settingThe head is changed by turning the terminal box selector switch as indicated in the table:

Fig. 14 Setting of pump head

Fig. 15 Three constant-speed curves

Curve conditionsThe guidelines below apply to the performance curves on the following data sheets:

• Test liquid: Airless water.• The curves apply to a density of ρ = 983.2 kg/m3

and a liquid temperature of 60°C.• All curves show average values and should not be

used as guarantee curves. If a specific minimum performance is required, individual measurements must be made.

• The curves apply to a kinematic viscosity of υ = 0.474 mm2/s (0.474 cST).

• The conversion between head H [m] and pressurep [kPa] has been made for water with a density of ρ = 1000 kg/m3. For liquids with other densities, e.g. hot water, the discharge pressure is proportional to the density.

Liquid temperature 75°C 90°C 110°C

0.5 m head 2.8 m head 11.0 m head

Setting Result SystemFactorysetting Pump performance

according to the heat-ing demand (in 80-90% of all single-family houses).

Variable-load one- or two-pipe heating system with normal resist-ance, with or without thermostatic valves.

Pump head is reduced. Variable-load heating system with low resistance, with or without thermostatic valves.

Pump head is increased.

Variable-load heating system with high resistance, with or without thermostatic valves, or underfloor heating system.Also systems fitted with a bypass valve.

Pump running at mini-mum performance.

Small constant-load heating system. Setting when adjusting a bypass valve.

Pump running at medium performance.

Medium-sized constant-load heating system.

Pump running at maxi-mum performance.

Large constant-load heating system. Setting when venting the system.

TM01

920

7 08

03TM

02 6

070

5002

Factory setting

0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 Q [m³/h]

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

H

[m]

0

10

20

30

40

50

p

[kPa]

0.0 0.2 0.4 0.6 0.8 Q [l/s]

0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 Q [m³/h]

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

H

[m]

0

10

20

30

40

50

p

[kPa]

0.0 0.2 0.4 0.6 0.8 Q [l/s]

IIIIII

Technical data
ALPHA+ 15-40, 25-40, 32-40 1 x 230 V, 50 Hz

TM03

134

4 17

05

Speed P1 [W] In [A]

Min. 20 0.09Max. 45 0.22

I 25 0.10II 35 0.16III 45 0.22

The motor incorporates thermal overload protection.

0.0 0.4 0.8 1.2 1.6 2.0 2.4 Q [m³/h]

0

1

2

3

4

H[m]

0 10 20 30 40 Q [l/min]

TM03

163

2 25

05

Connections: See "Union and valve kits" page 12System pressure: Max. 10 barLiquid temperature: +2°C to +110°C (TF 110)Energy class: B

Also available with: Bronze housing, type B (only ALPHA+ 25-40 B 180)

B1 B2

H3

H2H1

G

L

B3

Pump typeDimensions [mm] Weights [kg] Ship. vol.

[m3]L H1 H2 H3 B1 B2 B3 G Net GrossALPHA+ 15-40 130 28 103 57 92 48 77 1 2.4 2.6 0.00432ALPHA+ 25-40 130 32 103 57 92 48 77 1½ 2.4 2.6 0.00432ALPHA+ 25-40 180 32 103 57 92 48 77 1½ 2.6 3.0 0.00432ALPHA+ 32-40 180 39 103 57 92 48 77 2 2.7 3.1 0.00432

Weights of bronze versions are approx. 10% higher.

9

10

Technical data GRUNDCir


ALPHA+ 15-60, 25-60, 32-60 1 x 230 V, 50 Hz

TM03

134

5 17

05

Speed P1 [W] In [A]

Min. 35 0.14Max. 80 0.34

I 40 0.17II 55 0.23III 80 0.34


0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 Q [m³/h]

0

1

2

3

4

5

6

H[m]

0 10 20 30 40 50 Q [l/min]

TM03

163

2 25

05


Also available with: Bronze housing, type B(only ALPHA+ 25-60 B 180)

B1 B2

H3

H2H1

G

L

B3


[m3]L H1 H2 H3 B1 B2 B3 G Net GrossALPHA+ 15-60 130 28 103 57 92 48 77 1 2.4 2.6 0.00432ALPHA+ 25-60 130 32 103 57 92 48 77 1½ 2.4 2.6 0.00432ALPHA+ 25-60 180 32 103 57 92 48 77 1½ 2.6 3.0 0.00432ALPHA+ 32-60 180 39 103 57 92 48 77 2 2.7 3.1 0.00432

Weights of bronze versions are approx. 10% higher.

Technical data GRUNDFCirc


ALPHA+ 25-40 A 180 1 x 230 V, 50 Hz

ALPHA+ 25-60 A 180 1 x 230 V, 50 Hz

TM03

134

4 17

05A

LPH

A+

25-4

0 A

Speed P1 [W] In [A]

Min. 20 0.09Max. 45 0.22

I 25 0.10II 35 0.16III 45 0.22


0.0 0.4 0.8 1.2 1.6 2.0 2.4 Q [m³/h]

0

1

2

3

4

H[m]

0 10 20 30 40 Q [l/min]

TM03

163

1 25

05


B1 B2

H3

H2H1

L

G B3Rp 3/8


[m3]L H1 H2 H3 B1 B2 B3 G Net GrossALPHA+ 25-40 A 180 49 113 81 92 51 77 1½ 3.6 4.0 0.00542

TM03

134

5 17

05A

LPH

A+

25-6

0 A

P1 [W] In [A]

Min. 35 0.14Max. 80 0.34

I 40 0.17II 55 0.23III 80 0.34


0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 Q [m³/h]

0

1

2

3

4

5

6

H[m]

0 10 20 30 40 50 Q [l/min]

TM03

163

1 25

05


B1 B2

H3

H2H1

L

G B3Rp 3/8


[m3]L H1 H2 H3 B1 B2 B3 G Net GrossALPHA+ 25-60 A 180 49 113 81 92 51 77 1½ 3.6 4.0 0.00542

11

12

GRUNDFOS ALPHA+Circulator pumpsAccessories

Union and valve kits

Insulation kitsGRUNDFOS ALPHA+ can be fitted with two insulating shells.

The insulating thickness of the insulating kit corre-sponds to the nominal diameter of the pump.

The insulation kit, which is tailored to the individual pump type, encloses the entire pump housing. The two shells are easily fitted around the pump.

Fig. 16 Insulating shells

Service kit

Fig. 17 Plug

Pump type Description Material Product number

ALPHA+ 25-40,25-40 A, 25-60,25-60 A

¾" unions Cast iron 5299211" unions Cast iron 529922¾" valves MS 5198051" valves MS 519806

ALPHA+ 25-40B, 25-60 B

¾" unions MS 5299711" unions MS 529972¾" valves MS 5198051" valves MS 519806

ALPHA+ 32-40,32-60

1" unions Cast iron 5099211¼" unions Cast iron 509922

TM01

920

5 49

02

Pump type Product numberALPHA+ 15-40, 25-40, 32-40, 25-60, 32-60 505821

ALPHA+ 25-40 A, 25-60 A 505822

TM01

991

1 34

00

Description Product numberPlug 595562

entation
Further product docum
In addition to this printed data booklet, Grundfos offers the following sources of product documentation.

• WinCAPS• WebCAPS.

WinCAPSWinCAPS is a Windows-based Computer Aided Product Selection program containing information on more than 90,000 Grundfos products.

Available on CD-ROM in more than 15 languages, WinCAPS offers

• detailed technical information• selection of the optimum pump solution• dimensional drawings of each pump• detailed service documentation• installation and operating instructions• wiring diagrams of each pump.

Fig. 18 WinCAPS CD-ROM

Fig. 19 WinCAPS

cd-w

inca

psW

inC

APS

Click Catalogue and select a product from the extensive product catalogue.

Click Sizing and select the most suitable pump for your application.

13

14

Further product documentation

WebCAPSWebCAPS is a Web-based Compute Aided Product Selection program and a web-version of WinCAPS.

WebCAPS is accessible on Grundfos’ homepage, www.grundfos.com, and offers

• detailed technical information• dimensional drawings of each pump• wiring diagrams of each pump.

Fig. 20 WebCAPS

Web

CA

PS_E

ngl

ish

Click Catalogue and select a product from the extensive product catalogue.

Click Literature to select and download Grundfos documentation by brows-ing the product ranges or performing a specific search. Literature includes:– data booklets– installation and oper-

ating instructions– service, etc.

Click Search and select a product from the extensive product catalogue.

Click Service to find information on service kits and spare parts.

Click Sizing and select the most suitable pump for your application.

Click Replacement and select the right replacement pump based on the current installation.

Click CAD drawings to select and download CAD drawings in:–.stp–.dxf–.dwg

Being a registered user click Log in to:– save your settings– define and save your

own units– save personalised

information.

Click Settings and select your preferred options.

www.grundfos.com

V7162910 0705GBRepl. V7162910 0303 Subject to alterations.

GRUNDFOS A/S . DK-8850 Bjerringbro . DenmarkTelephone: +45 87 50 14 00.

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