GRUNDFOS INSTRUCTIONS

CU 301
Installer’s manual

CONTENTS
Page

1.

Constant-pressure control

3

1.1
1.2
1.3
1.4
1.5
1.6

Description
Function
System sizing
Positioning the pressure sensor
Precharge pressure setting
Pressure relief valve

3
3
5
6
6
6

2.

Operating functions

7

2.1
2.2
2.3
2.4

On/off button
Indication of pump operation
Pressure setting
Button locking

7
7
7
8

3.

Alarm functions

8

3.1
3.2

Service alarm
Dry-running protection

8
9

4.

Position of LEDs and fuse

10

5.

CU 301 with R100

11

5.1
5.1.1
5.1.2
5.1.3
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9

Menu OPERATION
Pressure setting
Operating mode
Alarm
Menu STATUS
Operating mode
Actual pressure
Speed
TemperaturePower input and power consumption
Operating hours and number of starts
Menu INSTALLATION
Sensor
Choice of sensor
Maximum pressure setting
Automatic restartDry-running stop
Maximum speed
Buttons on CU 301
Indication of pump operation
Number

14
14
14
14
15
15
15
15
15
15
16
16
16
16
16
17
17
17
17
18
18

6.

Fault finding

19

6.1

Service19

7.

Technical data

23

7.1
7.1.1
7.1.2
7.1.3

Electrical connection
Mains supply
Pump supply
Pressure sensor

24
25
25
25

2

1. Constant-pressure control

Fig. 2 shows the principle of mains borne signalling
between the CU 301 and the pump.
Fig. 2

1.1 Description
The system maintains a constant pressure within the
maximum pump performance in spite of a varying
water consumption.
Fig. 1 shows an example of an installation with constant-pressure control.
Fig. 1

CU 301

5

1

2

4

3

1

R 100

2
3

4

Pos.

TM01 7862 4999

6

7

8

Description

1

CU 301

2

Diaphragm tank3

Pressure sensor

4

SQE pump

1.2 Function

Mains borne signalling:
The communication between the CU 301 and thepump is effected via the power supply cable.
This communication principle is called mains borne
signalling (or power line communication). Using thisprinciple means that no additional cables to thepump are required.
The communication of data is effected by means of ahigh-frequency signal transmitted to the power supply cable and led into the electronics unit by meansof signal coils incorporated in the motor and the
CU 301 respectively.

TM01 8495 1703

The pressure is registered by means of the pressure
sensor, which transmits a signal to the CU 301. The
CU 301 adjusts the pump performance accordingly
by changing the pump speed.

Pos.

Description

1

Supply to the electronics

2

Signal coils

3

Capacitor

4

Electronics for the control of the communication

5

On/off button

6

Sensor signal

7Electricity supply

8

Communication signals

3

PressureTime

TM01 8545 0400

High flow

Low flow

Note: When the pressure is dropping 0.1 bar/s or
faster, the pump will start immediately.
If a diaphragm tank of 8 litres is used, the pump will
start at a flow rate of approx. 0.18 m³/h.
Note: If a larger tank is used, the flow must be
higher before the pump starts.
Consumption up to 0.18 m³/h:
The pump will start when the pressure has dropped
to 0.5 bar below the pressure setting.
The pump will run until the pressure is 0.5 bar above
the pressure set.
Flow detection:
During pump operation, i.e. when water is consumed, the CU 301 will adjust the pump speed tomaintain a constant pressure. In order to stop thepump when no water is consumed, the CU 301 performs flow detection every 10 seconds.
The pump speed is reduced until a small pressure
drop is registered. This pressure drop indicates thatwater is consumed and the pump speed is resumed,
see fig. 4.
If the pump speed can be reduced without any pressure drop being registered, this indicates that nowater is consumed. The diaphragm tank will be filledwith water and the pump will be stopped.

4

Fig. 4Pressure

10 s

10 s

Time

TM01 8546 0400

Flow detection

System limits:
Even though the CU 301 is controlling the pressure
within ±0.2 bar, bigger pressure variations may occur
in the system. If the consumption is suddenly
changed, e.g. if a tap is opened, the water must startflowing before the pressure can be made constantagain. Such dynamic variations depend on the pipework, but, typically, they will lie between 0.5 and1 bar.
If the desired consumption is higher than the quantity
the pump is able to deliver at the desired pressure,the pressure follows the pump curve as illustrated in
fig. 5.
Fig. 5Pressure
Stop+0.5 barA

Start-0.5 barControlling±0.2 bar

Dynamic
variations±0.5 bar
Flow
Flow

0.18

A = Pressure set

m³/hTM01 8634 0500

When does the pump start?
The pump starts as a consequence of...
• a high flow or• a low pressure or• a combination of both.
To ensure that the pump is started when water isconsumed, a flow detection is required. The flow is
detected via pressure changes in the system. Whenwater is consumed, the pressure will drop accordingly depending on the size of the diaphragm tank andthe water flow:• at a low flow, the pressure will drop slowly.
• at a high flow, the pressure will drop quickly.
See fig. 3.
Fig. 3

1.3 System sizing
To ensure the correct function of the system, it isimportant that the pump is of the right type.
During operation, the CU 301 controls the pumpspeed within the range from 3,000 min-1 to 10,700
min -1, see fig. 6.
It is recommended to follow the guidelines below:
Fig. 6

Pump type

H [m]Pump curve
at 3,000 min-1

Qmax

Q [m³/h]TM01 8547 0400

Min. head at no flow

Max. head at max. flow

Pump curveat 10,700 min-1

The following must be fulfilled:
1. Min. head at no flow < static head + system pressure.
2. Max. head at max. flow > dynamic head + systempressure.
Max. head at max. flow and min. head at no flow canbe found in the following table:

Max. headat Q = Qmax,

Min. headat Q = 0 m³/h,
3,000 min-1

10,700 min-1[m] / [feet][m] / [feet]

SQE 1 - 35

18 / 59

29 / 86

SQE 1 - 50

28 / 91

44 / 131

SQE 1 - 65

37 / 121

59 / 177

SQE 1 - 80

46 / 151

75 / 222

SQE 1 - 95

56 / 184

90 / 270

SQE 1 - 110

65 / 213

105 / 315

SQE 1 - 125

74 / 243

120 / 360

SQE 1 - 140

81 / 266

136 / 405

SQE 1 - 155

92 / 302

151 / 450

SQE 2 - 35

19 / 62

35 / 105

SQE 2 - 55

29 / 95

54 / 164

SQE 2 - 70

38 / 125

71 / 215

SQE 2 - 85

47 / 154

88 / 267

SQE 2 - 100

56 / 184

108 / 328

SQE 2 - 115

66 / 217

128 / 390

SQE 3 - 30

15 / 49

26 / 75

SQE 3 - 40

24 / 79

42 / 123

SQE 3 - 55

31 / 102

56 / 164

SQE 3 - 65

39 / 128

70 / 205

SQE 3 - 80

47 / 154

84 / 246

SQE 3 - 95

55 / 180

98 / 287

SQE 3 - 105

62 / 203

113 / 328

SQE 5 - 15

7.7 / 25

11 / 36

SQE 5 - 25

15 / 49

23 / 77

SQE 5 - 35

23 / 75

36 / 117

SQE 5 - 50

30 / 98

48 / 159

SQE 5 - 60

38 / 125

61 / 200

SQE 5 - 70

45 / 148

73 / 240

SQE 7 - 15

8.6 / 28

9 / 33SQE 7 - 30

18 / 59

23 / 82

SQE 7 - 40

27 / 89

37 / 1265

1.4 Positioning the pressure sensor
Pressure losses often cause inconvenience to theuser. The CU 301 keeps the pressure constant in theplace where the pressure sensor is positioned, seefig. 7.
Fig. 7

Note: If the precharge pressure is higher than thepressure setting, the system will not be able to control the pressure.
If the user wants to adjust the pressure withoutchanging the precharge pressure of the diaphragmtank, the precharge pressure must be equal to thelowest pressure setting used. This means that thecontrol will work but that the pressure fluctuations
might increase. In such cases, it is recommended touse a larger diaphragm tank, e.g. a tank of double
size.

1.6 Pressure relief valve

Tap 2
TM01 7862 4999

Tap 1

In fig. 7, tap 1 is placed close to the pressure sensor.
Therefore, the pressure will be kept nearly constantat tap 1, as the friction loss is small. At the shower
and tap 2, the friction loss is bigger. This, of course,
depends on the piping. However, old and furred-up
piping may cause inconvenience due to friction loss.
Example: A person is in the shower. Tap 2 isopened. The increased flow will cause pressure loss
in the pipe, and even though the CU 301 is keeping
the pressure constant at the pressure sensor, theperson in the shower will feel the pressure loss.
If the pressure sensor is placed closer to the shower
tap, the CU 301 will increase the pressure when theflow is increased. Then the pressure at the shower
and tap 2 will be kept constant, but the pressure at
tap 1 will be increased.
Therefore, it is recommended that the pressure sensor be positioned as close to the places of consumption as possible.

1.5 Precharge pressure setting
The precharge pressure of the diaphragm tank must
be set to 70% of the pressure setting in order to use
the tank to the limit of its capacity. This is of course
especially important when the tank volume is limited
to 8 litres.
Use the values in the following table:

6

Setting [bar]Precharge pressure [bar]

2

1.4

2.5

1.8

3

2.1

3.5

2.5

4

2.8

4.5

3.2

5

3.5

In order to provide protection against the possibilityof an overpressurization, a pressure relieve valve
should be installed down stream of the well head.
The setpoint of the pressure relief valve should be atleast 30 psi above the pressure setting, see section
2.3.
If a relief valve is installed, it is recommended that its
discharge be plumbed into an appropriate drainage
point.

2. Operating functions

2.2 Indication of pump operation

2.1 On/off button

On the graphical illustration on the CU 301 front, theriser pipe shows running light when the pump is
operating. When the pump is not operating, none of
the indicator lights are on, see fig. 9.
Fig. 9Fig. 8 shows the on/off button of the CU 301.
Fig. 8

Zielona dioda

Green indicator light

Red indicator
light
bar
5.0

Czerwona dioda

4.5
4.0
3.5
3.0

bar
5.0
4.5
4.0
3.5
3.0
2.5

TM01 8328 4701

2.0

The green and red indicator lights in the on/off button
indicate pump operating condition as follows:
Indication

Description

Green indicator lightpermanently on.

The system is operational.

Green indicator lightoff.

The system is not operational.

Red indicator lightpermanently on.

Pump has been stopped bymeans of the on/off button.*

Red indicator light
flashing.

The CU 301 is communicating with the R100.

* If the on/off button has been used to stop the
pump, this button must also be used for restarting.
Any alarm indication can be reset by pressing theon/off button.
If the on/off button is pressed for more than 5 seconds, the pump is started, irrespective of any active
fault/alarm indications and sensor signals.
When the on/off button is released, the pump will
stop, if the alarm still exists.

The indication of pump operation can be changed bymeans of the R100.
Possible settings:• “Running light” during pump operation (factory
setting).
• “Constant light” during pump operation.

2.3 Pressure setting
The two arrow buttons on the CU 301 front are used
for the pressure setting, see fig. 10.
Fig. 10
bar
5.0
4.5
4.0
3.5
bar
5.0
4.5

3.0

4.0
3.5
3.0

2.5

2.5
2.0

2.0

TM01 8329 4701

TM01 7860 4701

2.5
2.0

7

Indication of pressure setting:
The system pressure set is indicated by a yellow
indicator light, which is permanently on.
Setting range: 2, 2.5 ... 5.0 bar.

3. Alarm functions

Arrow-up button:
When this button is pressed, the system pressure
setting is increased in steps of 0.5 bar.

3.1 Service alarm

The CU 301 continuously receives operating datafrom the pump. The alarm functions indicated on the
CU 301 front are described in the following sections.
If one or more factory-set alarm values are exceeded, the indicator light for service alarm is permanently on, see fig. 12.
Fig. 12Arrow-down button:
When this button is pressed, the system pressure
setting is decreased in steps of 0.5 bar.

2.4 Button locking

bar
5.0
4.5
4.0
3.5
3.0
2.5

TM01 8330 4701

2.0

When the buttons are locked, the indicator light ispermanently on, see fig. 11.
For further information, see section 5.3.7 Buttons on
CU 301.

8

bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0

TM01 8327 4701

The buttons on the CU 301 can be locked/unlockedby pressing the two arrow buttons simultaneously for
5 seconds or via the R100 remote control.
Note: When the arrow buttons are used for locking,the pressure setting may change.
Use the following procedure:
1. Set the pressure one step up.
2. Press the arrow-down button as the first one
when pressing the two buttons.
Fig. 11

Possible alarms:• Sensor defective.
• Overload.
• Overtemperature.
• Speed reduction.
• Voltage alarm.
• No contact to pump.
The possible alarms and how to identify them andmake the relevant corrections are described in section 6.1 Service.

3.2 Dry-running protection
The purpose of the dry-running protection is to protect the pump in case of insufficient water flow.
The dry-running protection makes the conventional
dry-running protection unnecessary.
No additional cables to the motor are required.
The dry-running protection will be active after
30 seconds’ operation.
The dry-running alarm is activated when the load has
been below the minimum power limit for an accumulated time of 5 seconds.
The motor is stopped and the dry-running indicatorlight is permanently on, see fig. 13, pos. A.
Fig. 13

bar
5.0
4.5
4.0
3.5
2.5
2.0

A

Possible cause

The pump performanceis too high compared tothe borehole yield.

Borehole filter isblocked.

TM01 8329 4701

3.0

RemedyReplace the pump witha smaller one.
Reduce pump performance using the R100
display 5.3.6 Maximum speed.
Borehole service is required.

Restarting:After 5 minutes (factory setting), or the period set bymeans of the R100 display 5.3.4 Automatic restart,
the motor will restart automatically.

94. Position of LEDs and fuseFig. 141
2
3
4

TM01 8537 1703

5

Pos.

Indication

Description

1+24 V overload

Permanent red light when the internal 24 VDC supply is overloaded.

2

+24 V

Permanent green light when the internal 24 VDC supply is OK.

3

+10 V

Permanent green light when the internal 10 VDC supply is OK.

4

+5 V

Permanent green light when the internal 5 VDC supply is OK.

5

9 indicator lights:• Control indicator• Flashing green light when the pump control is working correctly.

• Min. speed• Permanent yellow light when the pump is running at minimum speed,
3,000 min -1.

• Max. speed• Permanent yellow light when the pump is running at maximum
speed, 10,700 min-1.

• Sensor defective *)• Permanent red light when the sensor signal is out of signal range.

• Overload *)• Permanent red light when the motor load exceeds the stop limit, seesection 7. Technical data.

• Overtemperature *)• Permanent red light when the motor temperature exceeds the stop
limit, see section 7. Technical data.

• Speed reduction *)• Permanent red light when the pump speed is reduced, see section
7. Technical data.

• Voltage alarm *)• Permanent red light when the supply voltage is out of range, seesection 7. Technical data.

• No contact to pump *)• Permanent red light when communication between the CU 301 andthe pump is impossible.

*) Press the on/off button to reset the alarm indication.

10

5. CU 301 with R100

R100

TM01 7861 4701

The remote control R100 can be used as a supplement for the installer. The R100 is used for wirelesscommunication with the CU 301.
Note: It is not necessary to use the R100 to operate
the system. The R100 offers additional features.
The R100 communicates via infra-red light. Duringcommunication, there must be visual contact between the CU 301 and the R100. The best visualcontact between the two units is obtained by pointing
the R100 at the lower arrow button or by removing
the front cover and pointing the R100 at the rightside of the CU 301, see fig. 15.
Fig. 15

The R100 offers possibilities of setting and status
displays for the CU 301.
When the communication between the R100 and
CU 301 has been established, the red indicator lightin the on/off button will flash.
For general use of the R100, see the operating instructions for this unit.
The menu structure for the R100 and CU 301 is
divided into four parallel menus, each including a
number of displays.
0. GENERAL, see operating instructions for the
R100.
1. OPERATION
2. STATUS
3. INSTALLATION
Menu overview, see fig. 16, page 12.
Note: The number stated at each individual display
in fig. 16 refers to the section in which the display isdescribed.

11

0. GENERAL

12
5.3.3

5.3.4

5.3.5

5.2.3

5.2.4

5.2.5

5.1.3

5.3.2

5.2.2

5.1.2

5.3.1

5.2.1

2. STATUS

5.1.1

1. OPERATION

3. INSTALLATION

Fig. 16

13

5.2.6

5.3.9

5.3.8

5.3.7

5.3.6

5.1 Menu OPERATION

5.1.3 Alarm
TM CU301_1_03 GB

The OPERATION menu for the CU 301 offers thepossibility of setting and reading operating parameters.
Factory settings are marked in bold-faced typeunder each individual display.

TM CU301_1_01 GB

5.1.1 Pressure settingThis display shows the types of alarm that may
occur.
Possible alarms are described in the following table:
Alarm
indication

Description

Set the required pressure.
Setting range:• 2.0-5.0 bar (0.5 bar intervals), 3.0 bar.
• 40-100 psi (10 psi intervals), 50 psi.

No fault indication

No alarms are registered by
the CU 301.

No contact topump

No communication between
the CU 301 and the pump.

Relation to other displays:
The setting in display 5.1.1 Pressure setting is overridden by the “Max.” and “Min.” settings in the displays 5.1.2 Operating mode and 5.3.3 Maximum
pressure setting.

Overvoltage

The supply voltage exceeds
the limit value.

Undervoltage

The supply voltage is below thelimit value.

Dry running

The dry-running protection of
the pump has been activated.

Overtemperature

The motor temperature exceeds the limit value.

Overload

The current consumption of the
motor exceeds the limit value.

Sensordefective

The sensor signal has fallen
outside the measuring range
set. The sensor signal of a4-20 mA or 2-10 V sensor is
below 2 mA or 1 V respectively.

TM CU301_1_02 GB

5.1.2 Operating mode

Select one of the following operating modes:• Max.
Pump operation is set to maximum speed, irrespective of the pressure setting. The maximum
speed is set in display 5.3.6 Maximum speed(factory setting: 10,700 min-1).
• Normal.
Normal operating mode, i.e. pump operation isbased on the pressure set in display 5.1.1 Pressure setting.
• Min.
Pump operation is set to minimum speed,
3,000 min-1, irrespective of the pressure setting.
• Stop.
The pump is stopped.
If the on/off button has been used to stop the pump,
this button must also be used for restarting.
Relation to other displays:
The “Max.” and “Min.” settings override the pressure
setting in display 5.1.1 Pressure setting.

145.2 Menu STATUS

5.2.3 Speed
TM CU301_2_03 GB

The STATUS menu for the CU 301 provides operating data about pump/motor and sensor. It is not possible to change or set values in this menu.
When [OK] is pressed continuously in this display,the displayed value is being updated.
The measuring accuracy is stated in section 7. Technical data.

TM CU301_2_02 GB

5.2.2 Actual pressure

The actual system pressure measured by the pressure sensor.
Tolerance: ±1%.

5.2.4 Temperature
TM CU301_2_04 GB

Possible operating modes:• Max.
Pump operation has been set to maximum speed,e.g. 10,700 min-1.
• Normal.
Normal operating mode, i.e. pump operation isbased on the pressure setting made in display
5.1.1 Pressure setting.
• Min.
Pump operation has been set to minimum speed,
3,000 min -1.
• Stop.
The pump has stopped.
The operating mode was selected from one of thefollowing:• CU 301 (on/off button on the CU 301).
• R100.
• Sensor (signals received via the sensor input).

The actual speed stated in min-1 (rpm).
Tolerance: ±1%.

The actual temperature of the motor electronics
stated in “°C” or “F”.
Tolerance: ±5%.
Relation to other displays:
To select “F”, choose the language “US English”.

5.2.5 Power input and power consumption
TM CU301_2_05 GB

TM CU301_2_01 GB

5.2.1 Operating mode

Power input:
The actual motor power from the electricity supply.
The power input is displayed in W (watt).
Note: This value is used for the calculation of minimum power limit (dry-running stop).
Power consumption:
The accumulated motor power consumption in kWh.
The value of power consumption is accumulated
from the pump’s birth and it cannot be reset.
The value• is stored in the motor electronics, and it is kept
even if the CU 301 is replaced.
• is updated in the software every 2 minutes of continuous operation. The displayed value is updated
every two hours.
Tolerance: ±5%.

155.2.6 Operating hours and number ofstartsOperating hours:
The value of operating hours is accumulated fromthe pump’s birth and it cannot be reset.
The value• is stored in the motor electronics, and it is kept
even if the CU 301 is replaced.
• is updated in the software every 2 minutes of continuous operation. The displayed value is updated
every two hours.

Relation to other displays:
The measuring unit appearing in display 5.2.2 Actualpressure will be identical to the measuring unit in thefront cover.
Exception: If “Manual” is selected in display
5.3.2 Choice of sensor, the sensor can be set, irrespective of the front cover.
If changes are made in display 5.3.1 Sensor, the setting in display 5.3.2 Choice of sensor is changed to“Manual”.
If the original setting is resumed, it is necessary tochange the setting in display 5.3.2 Choice of sensor
from “Manual” to “Automatic”.

5.3.2 Choice of sensor
TM CU301_3_02 GB

TM CU301_2_06 GB

When the front cover is replaced, the display 5.3.1
Sensor automatically changes from bar to psi or viceversa.

Number of starts:
The value of number of starts is accumulated fromthe pump’s birth and it cannot be reset.
The value is stored in the motor electronics, and it is
kept even if the CU 301 is replaced.
The INSTALLATION menu for the CU 301 offers thepossibility of configuring the CU 301, pump/motorand sensor.
Factory settings are marked in bold-faced typeunder each individual display.

TM CU301_3_01 GB

5.3.1 Sensor

Make the following settings according to sensor type:• Sensor output signal: “–” (not active), 0-20 mA,
4-20 mA, 0-10 V, 2-10 V.
• Setting range unit: bar, psi.
Setting range, bar:
• Minimum value: 0.
• Maximum value: 2-6 (2, 2.5, 3, 3.5 ... 6.0).
Setting range, psi:
• Minimum value: 0.
• Maximum value: 40-120 (40, 50, 60, 70 ... 120).
Two CU 301 front covers are available, one for “bar”
and another for “psi”, i.e. a “bar” front cover can be
replaced by a “psi” front cover.
Note: The pressure sensor must be replaced by asensor measuring the pressure in the actual measuring unit.
16

The following settings are available:• Automatic.
• Manual.
Relation to other displays:If, for some reason, the setting in this display haschanged to “Manual” and this is changed to “Automatic”, the setting of the displays 5.3.1 Sensor and5.3.3 Maximum pressure setting will change to thefactory setting.

5.3.3 Maximum pressure setting
TM CU301_3_03 GB

5.3 Menu INSTALLATIONThe setting of this display overrules the possibility ofusing the arrow button on the CU 301 front to increase the pressure to a setting above the “Maximum pressure setting”.
The following settings are available:• 2, 2.5 ... 5.0 bar.
Relation to other displays:
The setting of this display overrules the possibility ofusing the display 5.1.1 Pressure setting to increase
the pressure to a setting above the “Maximum pressure setting”.
If the setting is changed from 5.0 bar, the setting in
display 5.3.2 Choice of sensor changes from “Automatic” to “Manual”.

Relation to other displays:
The actual pump power input can be read in display
5.2.5 Power input and power consumption.
If the maximum pump speed has been reduced indisplay 5.3.6 Maximum speed, the dry-running stop
value must be changed.

5.3.6 Maximum speed
TM CU301_3_06 GB

TM CU301_3_04 GB

5.3.4 Automatic restart

Set the automatic restart time from stop, caused byan alarm, to restart attempt.
The following settings are available:Time:• 0:05.
• “–” (not active).
• 1, 2, ... 30 m (1 min. intervals),
30, 45, 1 h, ... 2 h (15 min. intervals),
2 h 30 m, 3 h, ... 4 h (30 min. intervals).

Set the maximum speed.
Setting range: 3,000-10,700 min-1 (100 min-1 intervals).

Double:• Yes.
• No.
When “Yes” is selected, the restart time set will be
doubled automatically for every 10 motor stops
caused by an alarm. The time is doubled up to a stoptime of 4 hours. After 10 hours of operation without
an alarm, the restart time is automatically set to:• the time set in the “Time” field or• 5 min. (factory setting) if no setting was made in
the “Time” field.

Dry-running stop at reduced maximum pumpspeed:
If the maximum pump speed has been reduced, thedry-running stop value in display 5.3.5 Dry-runningstop must be changed.
Calculating the minimum power limit:
Note: The calculated value is used in display
5.3.5 Dry-running stop.
Note: If the pump is worn, a renewed calculation of
the minimum power limit may be required.
Step

The dry-running stop value is factory-set.
The value depends on the actual motor.
The factory setting depends on the power rating of
the motor.
The following settings are possible:• Motor type 0.1 to 0.63 kW, dry-running stop =300 W.
• Motor type 0.7 to 1.05 kW, dry-running stop =680 W.
• Motor type 1.1 to 1.73 kW, dry-running stop =800 W.
When the dry-running protection is to be active, theminimum value of the pump power input must be set
in this display.
Setting range: 0-2500 W (10 W intervals).

Action1

Start the pump against closed discharge
valve.

2

Read the power input (P1) in display
5.2.5 Power input and power consumption.

3

Calculate the minimum power limit as follows:
Power limit [W] = P1 · 0.9.

5.3.7 Buttons on CU 301
TM CU301_3_07 GB

TM CU301_3_05 GB

5.3.5 Dry-running stop

The buttons on the CU 301 can be set to:• Active.
• Not active.

17

TM CU301_3_08 GB

5.3.8 Indication of pump operation

The following settings are available:• Running light.
• Constant light.

TM CU301_3_09 GB

5.3.9 Number

Allocate a number to the CU 301 and the pump connected. The CU 301 and the pump must have thesame number.
Setting range: “–” (not active), 1, 2, ... 64.
Once a number setting has been made, the factory
setting (not active) is no longer available.
If the CU 301 and the pump do not have the same
number, the alarm “No contact to pump” will be indicated.

18

6. Fault finding
Before starting any work on the CU 301,
make sure that the electricity supply has
been switched off and that it cannot be accidentally switched on.

A number of LEDs are mounted on the supply board
inside the CU 301, see section 4. Position of LEDs
and fuse.
Fig. 18 shows the LEDs and the alarm texts on the
supply board.
Fig. 18

6.1 Service
The CU 301 continuously receives operating datafrom the pump. In case of an alarm, the service indicator light is permanently on, see fig. 17.
Fig. 17

bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0

bar
5.0

CU 30

1

4.5
4.0
3.5
3.0
2.5
2.0

CONTROL INDICATOR

MIN. SPEEDSENSOR DEFECTIVE

OVER LOAD
OVERTEMPERATURE

SPEED REDUCTIONVOLTAGE ALARM
NO CONTACT TO PUMPThe service indicator light will be permanently on if
one of the following alarm situations occurs:• Sensor defective.
• Overload.
• Overtemperature.
• Speed reduction.
• Voltage alarm.
• No contact to pump.
To identify the cause of the service alarm, it isnecessary to remove the front cover from the
CU 301. Fit the front cover as shown in fig. 18 to
avoid disconnecting the multi-core cable.

TM01 8435 1703

TM01 8327 4701

MAX. SPEED

19

FaultPossible cause

1.

No light in thefront cover.

a) The multi-core•connection is misplaced or defec- •
tive.

2.

The pump does a) The CU 301 or
not start.
the pump is deThe green indifective.
cator light in theon/off button ison.
No alarm is indicated.

3.

The pressure is a) The pump is not Checknot constant.
of the correct type • that the LED for Max. speed or Min. speed is on.
or the precharge
If so, this indicates that the pump has reached a limit.
pressure of the
See section 1.3 System sizing.
diaphragm tank is
Replace the pump, if necessary.
incorrect.
• the precharge pressure of the diaphragm tank.
Note: Remember to stop and drain the system before thepressure is checked.
• whether the sensor is positioned far away from the tap.
If so, the pressure variations may be caused by friction
losses, see section 1.4 Positioning the pressure sensor.

4.

The pump is
running continuously.

Is the control indicator LED flashing?
If not, the CU 301 is defective.
Check that the multi-core cable connection is OK.
If so, the CU 301 is defective.

Check• that the control indicator LED is flashing.
If not, the CU 301 is defective.
• that the system pressure is 0.5 bar below the pressure setting.
If so, the pump is supposed to start. Open a tap to be sure.
If the pump starts, the system is probably OK.
The system pressure can be read on the pressure gauge.
• See point 13. to check the pressure sensor.
If the pump has not started yet, proceed as follows:• Press the on/off button for 5 seconds.
If the pump starts, the CU 301 or the sensor may be defective.
Note: The pressure is not controlled and may rise to a highlevel.

a) The pump cannot • Try to lower the pressure set, see section 1.3 System sizing.
deliver the presNote that the pump may run for about 15 to 20 seconds besure set.
fore it stops.
The CU 301 or• Check that the control indicator LED is flashing.
the sensor is de• Check that the pipe end of the sensor is not blocked.
fective.
If so, remove the blockage.
• Try to stop the pump by means of the on/off button.
If this is not possible, the CU 301 is defective.
Replace the CU 301.
• See point 13. to check the pressure sensor.

(continued on the following pages)

20

Remedy5.

The CU 301 in- a) The motor is not
dicates “Noan MSE 3.
contact topump”.

If the pump has already worked satisfactorily with a CU 301 or a
CU 300, the motor can be expected to be an MSE 3.
There is no technical way of determining the motor type. The
only way is to read the nameplate engraved in the motor sleeve.

b) The pump cableis longer than
200 metres.

Reduce the length of the pump cable.

c) Cable breakage.

Switch off the mains supply to the CU 301.
Switch on the mains supply again. The pump is now connected
direct to the mains supply without interference from the CU 301.
Does the motor start?
Yes: The cable is OK. Go to point d).
No: Switch off the mains supply again. Remove cable and cableplug from the motor and carry out megging of cable complete including plug.
Is the cable OK?
Yes: The motor is defective. Replace the motor.
No: Replace the cable.

d) Cross communication with adjacent CU 301.

If another CU 301 is installed:• Insure each unit has a unique number assigned. See section
5.3.9 Number.
• If pump cables run parallel to each other, physically separate
them by 12-14 inches or rewire using shielded cable.

e) The CU 301 com- Are the three CU 301 supply board LEDs in pos. 2, 3 and 4 onmunication part is and is the control indicator LED flashing? See section 4. Posidefective.
tion of LEDs and fuse.
Yes:• The mains supply is OK.
• Give the system a new number.
If this does not work, the CU 301 or the motor communication
part is defective.
Replace the CU 301 and give the new system a number between 1 and 64 in order to obtain correspondence between thenumbering of the SQE pump and the CU 301.
Note: Two systems on the same mains supply must not have thesame number!
Is the LED “No contact to pump” of the new CU 301 also on?
Yes: The CU 301 is OK. Go to point e).
No: The CU 301 which was removed is defective.
f) The MSE 3 motor As a consequence of the above-mentioned checks, replace thecommunication
MSE 3 motor.
part is defective.
6.

Even AFTER
replacement,
the CU 301 indicates “Nocontact topump”.

a) Numbering of
SQE pump and
CU 301 is different.

If an SQE/CU 301 system has been given a number, this number
is stored in both the SQE and CU 301.
A new CU 301 will probably not have a number corresponding to
the number stored in the SQE. Therefore, “No contact to pump”
is indicated even if there is no fault.
Give the new system a number between 1 and 64 in order to obtain correspondence between the numbering of the SQE pumpand the CU 301.
Note: Two systems on the same mains supply must not have thesame number!

21

7.

The CU 301 in- a) The supply voltdicates “Overage is unstable orvoltage” oroutside the volt“Undervoltage”.
age range specified for the installed motor
type.

8.

The CU 301 in- If the power consumption is lower than the dry-running stop setting for an accumulated
period of 5 seconds, the pump will be stopped.
dicates “Dryrunning”.
a) The pump perReplace the pump with a smaller pump or reduce the pump performance is tooformance.
high for the borehole yield.

Check - possibly over a period of time - that the supply voltage isaccording to the values below.
A. Motor type 0.1 to 0.63 kW / 0.3 to 0.5 hp = 190 - 320 V.
B. Motor type 0.7 to 1.05 kW / 0.5 to 0.7 hp = 190 - 320 V.
C. Motor type 1.1 to 1.73 kW / 1.0 to 1.5 hp = 210 - 320 V.
Note: As the voltage is detected at the motor, allow for the voltage drop in the pump cable.

b) The well screen is Check the well capacity and restore water supply to the well.
blocked.
c) The dry-runningstop setting is incorrect.
9.

Check and correct the setting, see section 5.3.5 Dry-runningstop.

The CU 301 in- Speed reduction is activated so as to maintain a reduced performance. When the supdicates “Speed ply voltage falls so low that it can no longer supply the necessary current to maintainreduction” and 3,000 min-1, the pump will be stopped.
“Undervoltage”.
a) The supply voltRestore correct supply voltage.
age is unstable or
lower than thevoltage range
specified for the
installed motortype.
b) The pump is notof the correct
type.

Install correct pump type.

c) The voltage dropin the pump cable is too big.

Replace the pump cable.

10. The CU 301 in- Speed reduction is activated so as to maintain a reduced performance.
dicates “Speeda) The pump is worn The pump must be serviced.
reduction” andor blocked.
“Overload”.
b) The pump is too Replace pump or motor.
large for the installed motor.
11. The CU 301 in- The temperature sensor in the motor is sensing a temperature above the values below:
dicates “Over- A. Motor type 0.1 to 0.63 kW / 0.3 to 0.5 hp = 65°C.
temperature”.
B. Motor type 0.7 to 1.05 kW / 0.5 to 0.7 hp = 75°C.
C. Motor type 1.1 to 1.73 kW / 1.0 to 1.5 hp = 85°C.
a) Insufficient cooling of the motor.

Restore correct cooling of the motor. The flow velocity past the
motor should be at least 0.15 m/s.

12. The CU 301 in- a) The pump is worn The pump must be serviced.
dicates “Overor blocked.
load”.
b) The pump is too Replace pump or motor.
large for the installed motor.

2213. The CU 301 in- a) The pressure
dicates “Sensensor is defecsor defective”.
tive.

Check that the sensor is installed correctly.
Check that the R100 setting of the sensor is correct, see section
5.3.1.
Check that the R100 setting of the sensor is correct.
If the sensor type is 4-20 mA, measure the signal current.
If the current is above 2 mA, the sensor and wiring are OK.
If the current is below 2 mA, the sensor or wiring is defective.
Replace defective parts.
Are the LED “Sensor defective” and the LED, pos. 1, on? Seesection 4. Position of LEDs and fuse.
Yes: The total load of 24 VDC from terminal 5 is above 100 mA.
Disconnect the sensor in order to determine if it is defective.
Replace defective sensor.
No: The load is OK, but the CU 301 sensor input may be defective.

14. The pump is
operating on/
off.

Check that the LED “No contact to pump” is on.
If so, the control unit CU 301 starts and stops the pump, basedon the sensor signal only. The CU 301 has to be reset every
250 stops.
Refer to fault no. 5 for remedy.

a) No communication.

7. Technical data
Supply voltage
1 x 100-240 V –10%/+6%, 50/60 Hz, PE.

Dimensional sketch
Fig. 19

bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0

195

Back-up fuse
Maximum 16 A.

114

232

Power consumption
5 W.

Current consumption
Maximum 130 mA.

104.5

104.5

100

Maximum length between CU 301 and pump
200 metres.

140.5

Enclosure class
IP 55.

Ambient temperature• During operation: –30 to +50°C(must not be exposed to direct sunlight).
• During storage: –30 to +60°C.
Weight2.0 kg.
Relative air humidity
Maximum 95%.

Sensor input

External sensor

Materials
The CU 301 box is made of black PPO.
EMC (electromagnetic compatibility)
According to EN 55 014 and EN 55 014-2.

TM01 7842 4999 / TM01 7864 4999

Mains borne signalling
Frequency shift keying (FSK).
(132.45 kHz, ±0.6 kHz).

Voltage signal:
0-10 VDC/2-10 VDC, Ri = 11 kΩ.
Tolerance: ±3% at maximum voltage signal.
Screened cable is recommended.
Maximum cable length: 500 m.
Current signal:
DC 0-20 mA/4-20 mA, Ri = 500 Ω.
Tolerance: ±3% at maximum current signal.
Screened cable is recommended.
Maximum cable length: 500 m.
23

Factory settings
200-240 V motors

100-115 V motors

Alarm
0.1 - 0.63 kW
Sensor defective
Overload
Overtemperature
Speed reduction

0.7 - 1.05 kW

1.1 - 1.73 kW

0.1 - 0.63 kW

4-20 mA (the value is stored in the CU 301)
5A

8A

11 A

11 A

Stop limit: 65°C

Stop limit: 75°C

Stop limit: 85°C

Stop limit: 85°C

Restart: 55°C

Restart: 65°C

Restart: 75°C

Restart: 75°C

In connection with undervoltage or overload

Overvoltage *)320 VAC

320 VAC

320 VAC

185 VAC

Undervoltage

Speed reduction:
190 V

Speed reduction:
190 V

Speed reduction:
210 V

Speed reduction:
90 V

Stop limit: 150 V

Stop limit: 150 V

Stop limit: 150 V

Stop limit: 75 V

300 W

680 W

800 W

Dry running

300 W*) 200-240 V motors: Operation is guaranteed up to 280 VAC.
100-115 V motors: Operation is guaranteed up to 150 VAC.
In order to avoid unnecessary stops, the overvoltage stop limit is as stated.

7.1 Electrical connection

Accuracy of R100 readings
Operation
Display

Accuracy

5.2.2 Actual pressure±0.1 bar

5.2.3 Speed±1%

5.2.4 Temperature±5%

5.2.5 Power input andpower consumption±5%

Sensor
The sensor signal accuracy depends on the sensor
type. See the sensor specifications in question.

The supply voltage and frequency are marked on the
nameplate. Make sure that the CU 301 is suitable forthe electricity supply on which it will be used.
The CU 301 has two terminal blocks:• Screw terminals 1 to 4.
• Spring terminals 5 to 7.
Furthermore, the CU 301 is equipped with two screw
terminals for the protective earth leads (PE).
The CU 301 is supplied with special gaskets for thePg cable entries. The special gaskets are suitable forflat cables and single-core cables.
Never make any connections on the
CU 301 terminal block unless the electricity supply has been switched off. The
CU 301 must be connected in accordancewith the local rules and standards in force
for the application in question.
The on/off button on the CU 301 must not be used asa safety switch when installing and servicing the
pump.

24

Fig. 20

4

POWER

PUMP
+24V IN GNDPEPESENSOR

3

5 6 7

1 2

1

L N

N

L

3
2

TM01 7720 4999

47.1.2 Pump supply

Legend:1Standard pressure sensor.
+ 24 VDC, brown lead, terminal 5.

2Standard pressure sensor.
Input signal, black lead, terminal 6.

3Standard pressure sensor.
Screen, terminal 7.

PUMP, terminals 3, 4 and PE:
Connect terminals 3 and 4 to the phase and neutral
leads of the pump. Each terminal can be connected
to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².

4Standard pressure sensor.

7.1.3 Pressure sensor

Pos.

Description

7.1.1 Mains supply
POWER, terminals 1, 2 and PE:
Connect terminals 1 and 2 to the phase and neutral
leads of the mains supply. Each terminal can be connected to any of the two leads.
Connect the PE terminal to the green/yellow earth
lead. Each PE terminal must be connected to an
earth lead of its own.
Maximum cross-section of the leads to be connected
is 6 mm².
Back-up fuse: Maximum 16 A.
Note: The leads of the mains supply must not be
connected to terminals 3 and 4 (PUMP).

SENSOR, terminals 5, 6 and 7:
Terminals 5, 6 and 7 (SENSOR) are used for thepressure sensor.
Sensor signals:
The sensor to be connected must give signals within
one of the following ranges:• 0-10 V.
• 2-10 V.
• 0-20 mA.
• 4-20 mA.
Changeover between current and voltage signals iscarried out by means of the R100.
Important!
The total load of terminal 5 (+24 VDC) must notexceed 100 mA.
Subject to alterations.
25

26

Denmark
GRUNDFOS DK A/SPoul Due Jensens Vej 7A
DK-8850 Bjerringbro
Tlf.: +45-87 50 50 50
Telefax: +45-87 50 51 51
E-mail: info_GDK@grundfos.com
www.grundfos.com/DK
Argentina
Bombas GRUNDFOS de Argentina S.A.
Ruta Panamericana km. 37.500
Lote 34A
1619 - Garin
Pcia. de Buenos Aires
Phone: +54-3327 414 444
Telefax: +54-3327 411 111
Australia
GRUNDFOS Pumps Pty. Ltd.
P.O. Box 2040
Regency Park
South Australia 5942
Phone: +61-8-8461-4611
Telefax: +61-8-8340 0155
Austria
GRUNDFOS Pumpen Vertrieb
Ges.m.b.H.
Grundfosstraße 2A-5082 Grödig/Salzburg
Tel.: +43-6246-883-0
Telefax: +43-6246-883-30
Belgium
N.V. GRUNDFOS Bellux S.A.
Boomsesteenweg 81-83
B-2630 Aartselaar
Tél.: +32-3-870 7300
Télécopie: +32-3-870 7301
BrazilGRUNDFOS do Brasil Ltda.
Rua Tomazina 106
CEP 83325 - 040
Pinhais - PR
Phone: +55-41 668 3555
Telefax: +55-41 668 3554
CanadaGRUNDFOS Canada Inc.
2941 Brighton Road
Oakville, Ontario
L6H 6C9
Phone: +1-905 829 9533
Telefax: +1-905 829 9512
China
GRUNDFOS Pumps (Shanghai)
Co. Ltd.
22 Floor, Xin Hua Lian Building
755-775 Huai Hai Rd, (M)Shanghai 200020
PRC
Phone: +86-512-67 61 11 80
Telefax: +86-512-67 61 81 67
Czech Republic
GRUNDFOS s.r.o.
Cajkovského 21
779 00 Olomouc
Phone: +420-585-716 111
Telefax: +420-585-438 906
FinlandOY GRUNDFOS Pumput AB
Mestarintie 11
Piispankylä
FIN-01730 Vantaa (Helsinki)
Phone: +358-9 878 9150
Telefax: +358-9 878 91550

FrancePompes GRUNDFOS Distribution S.A.
Parc d’Activités de Chesnes
57, rue de Malacombe
F-38290 St. Quentin Fallavier(Lyon)
Tél.: +33-4 74 82 15 15
Télécopie: +33-4 74 94 10 51
Germany
GRUNDFOS GMBH
Schlüterstr. 33
40699 ErkrathTel.: +49-(0) 211 929 69-0
Telefax: +49-(0) 211 929 69-3799
e-mail: infoservice@grundfos.de
Service in Deutschland:e-mail: kundendienst@grundfos.de
GreeceGRUNDFOS Hellas A.E.B.E.
20th km. Athinon-Markopoulou
Av.
P.O. Box 71
GR-19002 Peania
Phone: +0030-210-66 83 400
Telefax: +0030-210-66 46 273
Hong Kong
GRUNDFOS Pumps (HongKong) Ltd.
Unit 1, Ground floor
Siu Wai Industrial Centre
29-33 Wing Hong Street &68 King Lam Street, Cheung Sha
Wan
KowloonPhone: +852-27861706/
27861741
Telefax: +852-27858664
Hungary
GRUNDFOS Hungária Kft.
Park u. 8
H-2045 Törökbálint,
Phone: +36-23 511 110
Telefax: +36-23 511 111
India
GRUNDFOS Pumps India Private Limited
Flat A, Ground Floor
61/62 Chamiers Aptmt
Chamiers Road
Chennai 600 028
Phone: +91-44 432 3487
Telefax: +91-44 432 3489
Indonesia
PT GRUNDFOS Pompa
Jl. Rawa Sumur III, Blok III/CC-1
Kawasan Industri, Pulogadung
Jakarta 13930
Phone: +62-21-460 6909
Telefax: +62-21-460 6910/460
6901
Ireland
GRUNDFOS (Ireland) Ltd.
Unit 34, Stillorgan Industrial Park
Blackrock
County Dublin
Phone: +353-1-2954926
Telefax: +353-1-2954739
Italy
GRUNDFOS Pompe Italia S.r.l.
Via Gran Sasso 4I-20060 Truccazzano (Milano)Tel.: +39-02-95838112
Telefax: +39-02-95309290/
95838461

Japan
GRUNDFOS Pumps K.K.
1-2-3, Shin Miyakoda
Hamamatsu City
Shizuoka pref. 431-21
Phone: +81-53-428 4760
Telefax: +81-53-484 1014
Korea
GRUNDFOS Pumps Korea Ltd.
6th Floor, Aju Building 679-5
Yeoksam-dong, Kangnam-ku,
135-916
Seoul Korea
Phone: +82-2-5317 600
Telefax: +82-2-5633 725
Malaysia
GRUNDFOS Pumps Sdn. Bhd.
7 Jalan Peguam U1/25
Glenmarie Industrial Park
40150 Shah Alam
SelangorPhone: +60-3-5569 2922
Telefax: +60-3-5569 2866
MexicoBombas GRUNDFOS de Mexico
S.A. de C.V.
Boulevard TLC No. 15
Parque Industrial Stiva Aeropuerto
Apodaca, N.L. 66600
MexicoPhone: +52-81-8144 4000
Telefax: +52-81-8144 4010
Netherlands
GRUNDFOS Nederland B.V.
Postbus 104
NL-1380 AC Weesp
Tel.: +31-294-492 211
Telefax: +31-294-492244/492299
New Zealand
GRUNDFOS Pumps NZ Ltd.
17 Beatrice Tinsley Crescent
North Harbour Industrial Estate
Albany, Auckland
Phone: +64-9-415 3240
Telefax: +64-9-415 3250
NorwayGRUNDFOS Pumper A/S
Strømsveien 344
Postboks 235, Leirdal
N-1011 Oslo
Tlf.: +47-22 90 47 00
Telefax: +47-22 32 21 50
PolandGRUNDFOS Pompy Sp. z o.o.
ul. Klonowa 23
Baranowo k. Poznania
PL-62-081 Przezmierowo
Phone: +48-61-650 13 00
Telefax: +48-61-650 13 50
Portugal
Bombas GRUNDFOS Portugal,
S.A.
Rua Calvet de Magalhães, 241
Apartado 1079
P-2770-153 Paço de Arcos
Tel.: +351-21-440 76 00
Telefax: +351-21-440 76 90

Singapore
GRUNDFOS (Singapore) Pte.
Ltd.
24 Tuas West Road
Jurong Town
Singapore 638381
Phone: +65-6865 1222
Telefax: +65-6861 8402
Spain
Bombas GRUNDFOS España
S.A.
Camino de la Fuentecilla, s/n
E-28110 Algete (Madrid)
Tel.: +34-91-848 8800
Telefax: +34-91-628 0465
SwedenGRUNDFOS AB
Box 333, (Lunnagårdsgatan 6)
431 24 Mölndal
Tel.: +46-0771-32 23 00
Telefax: +46-31 331 94 60
Switzerland
GRUNDFOS Pumpen AG
Bruggacherstrasse 10
CH-8117 Fällanden/ZH
Tel.: +41-1-806 8111
Telefax: +41-1-806 8115
TaiwanGRUNDFOS Pumps (Taiwan)
Ltd.
7 Floor, 219 Min-Chuan Road
Taichung, Taiwan, R.O.C.
Phone: +886-4-2305 0868
Telefax: +886-4-2305 0878
Thailand
GRUNDFOS (Thailand) Ltd.
947/168 Moo 12, Bangna-Trad
Rd., K.M. 3,
Bangna, Phrakanong
Bangkok 10260
Phone: +66-2-744 1785 ... 91
Telefax: +66-2-744 1775 ... 6
TurkeyGRUNDFOS POMPA SAN. ve
TIC. LTD. STI
Bulgurlu Caddesi no. 32
TR-81190 Üsküdar Istanbul
Phone: +90 - 216-4280 306
Telefax: +90 - 216-3279 988
United Arab Emirates
GRUNDFOS Gulf Distribution
P.O. Box 16768
Jebel Ali Free Zone
Dubai
Phone: +971-4- 8815 166
Telefax: +971-4-8815 136
United Kingdom
GRUNDFOS Pumps Ltd.
Grovebury Road
Leighton Buzzard/Beds. LU7 8TL
Phone: +44-1525-850000
Telefax: +44-1525-850011
U.S.A.
GRUNDFOS Pumps Corporation
17100 West 118th Terrace
Olathe, Kansas 66061
Phone: +1-913-227-3400
Telefax: +1-913-227-3500

RussiaOOO GRUNDFOS
Shkolnaya 39
RUS-109544 Moscow
Phone: +7-095 564 88 00, +7095 737 30 00
Telefax: +7-095 564 88 11, +7095 737 75 36
e-mail: grundfos.moscow@grundfos.com
Addresses revised 21.01.2005

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