Grundfos STR2, SSR2 CN, STR2 CN, SSR2, SSP Installation And Operating Instructions Manual

GRUNDFOS INSTRUCTIONS

Shower pumps

SSR2, SSR2 CN, STR2, STR2 CN, SSP, STP, SSN and STN

Installation and operating instructions

2

Shower pumps

English (GB)

Functional profile and user manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Türkçe (TR)

Functional profile and user manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table of contents

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English (GB) Functional profile and user manual

English (GB)

Original installation and operating instructions

CONTENTS

1. General information

1.1 Hazard statements

1.2 Notes

2. Safety instructions

2.1 Electrical installation

2.2 Fault finding

3. General description

3.1 Applications

3.2 Type key

4. Installation

4.1 Positioning the pump

4.2 Pipes

4.3 Cold-water storage tank

4.4 Valves and strainers

4.5 Connecting the pump

4.6 Temperature setting

4.7 Installation options

5. Electrical installation

6. Startup

6.1 Shaft seal run-in

7. Universal-head pumps

7.1 General description

7.2 Dry-running protection

7.3 Connecting the pump

7.4 Operating instructions

7.5 Installation options

8. Technical data

9. Fault finding

9.1 Positive-head pumps (STP, SSP, STR2, SSR2)

9.2 Universal-head pumps (STN, SSN, STR2 CN and
SSR2 CN)

10. How it works

10.1 Universal-head pumps

11. Engineer check list

12. Maintenance and service

13. Disposal

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1. General information

1.1 Hazard statements

The symbols and hazard statements below may appear in
Grundfos installation and operating instructions, safety

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instructions and service instructions.

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5

5

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5

6

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6

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8
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The hazard statements are structured in the following way:

DANGER

Indicates a hazardous situation which, if not avoided,
will result in death or serious personal injury.

WARNING

Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.

CAUTION

Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.

SIGNAL WORD
Description of hazard

Consequence of ignoring the warning.

- Action to avoid the hazard.

Read this document before installing the product.
Installation and operation must comply with local
regulations and accepted codes of good practice.

This appliance can be used by children aged from 8
years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience
and knowledge if they have been given supervision
or instruction concerning use of the appliance in a
safe way and understand the hazards involved.

Children shall not play with the appliance. Cleaning
and user maintenance shall not be made by children
without supervision.

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1.2 Notes

The symbols and notes below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.

Observe these instructions for explosion-proof
products.

A blue or grey circle with a white graphical symbol
indicates that an action must be taken.

DANGER
Electric shock

Death or serious personal injury

- Connect the pump to a socket
with earth connection.

- We recommend that you fit the
permanent installation with an
earth leakage circuit breaker
(ELCB) with a tripping current ≤
30 mA.

English (GB)

A red or grey circle with a diagonal bar, possibly with
a black graphical symbol, indicates that an action
must not be taken or must be stopped.

If these instructions are not observed, it may result in
malfunction or damage to the equipment.

Tips and advice that make the work easier.

2. Safety instructions

2.1 Electrical installation

DANGER
Electric shock

Death or serious personal injury

- Before starting any work on the
product, make sure that the
power supply has been switched
off and that it cannot be
accidentally switched on.

DANGER
Electric shock

Death or serious personal injury

- The unit must be connected to a
switched spur fused at 5 A (10 A
on models STP 4.0 B and STN

4.0 B) with a minimum contact
gap of 3 mm in all poles.

- Metal pipes must be earthed by
the use of earthing clamps and 4
mm2 earthing wire, according to
BS 951.

DANGER
Electric shock

Death or serious personal injury

- Fit the terminal box cover before
you switch on the power supply.

Complete all pipe installation
before making any electrical
connections.

Do not allow any water to enter into
the electrical terminal box.

The electrical installation must be
carried out by an authorised
person in accordance with local
regulations.

2.2 Fault finding

DANGER
Electric shock

Death or serious personal injury

- Before starting any work on the
product, make sure that the
power supply has been switched
off and that it cannot be
accidentally switched on.

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3. General description

> 227 litres
(50 gallons)

> 227 litres
(50 gallons)

English (GB)

These installation and operating instructions apply to Grundfos
shower pumps, types SSR2, STR2, SSP, STP, SSN and STN.

3.1 Applications

Grundfos shower pumps are suitable for pressure boosting of
clean (fresh) water, without any additives, in domestic hot- and
cold-water systems.

3.2 Type key

Example S T P 2.0 B

S: Shower pump
T:S:Twin impeller

Single impeller
Positive head

P:

Universal (negative) head

N:

Low voltage

L:

Centrifugal

C:

Regenerative

R:
Maximum head [bar]
Material:

Brass

B:

Composite

C:

Composite, universal (negative) head

CN:

4. Installation

The system in which this product is incorporated must be
designed to meet the pumps requirements.

Symbols used in illustrations

Do not connect the pump directly to the water mains
supply.
Do not use the pump with combination boilers.
Make sure that no foreign particles, such as solder
and dust, are allowed to enter the pump.
The pump is damaged if the water level in the cold­water storage tank is below the pump.

TM05 6978 0313TM05 6977 0313

Fig. 1 Do not connect directly to the mains.

Symbol Description

Cold-water storage tank

Hot-water cylinder

Shower pump

Shower head

Tap or outlet

Hot water

Cold water

Mains supply pipe

Fig. 2 Connection to mains via storage tank

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4.1 Positioning the pump

=

H

inlet

> 227 litres
(50 gallons)

> 227 litres
(50 gallons)

Min. 250 mm

Select a position for installing the pump which affords
easy access for subsequent servicing and
maintenance.

Do not cover the pump; otherwise, the motor will
overheat.

Keep the pump as close as possible to the source of hot and cold
water.

For optimum performance, ensure the following:

• A good water flow to the pump.

• Sufficient inlet head. See table and fig. 3.

• Unrestrictive pipes, 22 mm. See fig. 4.

• Provision to prevent air locks. See fig. 4.
Place the pump in a well-ventilated location.

Type Inlet head [m]

STP, SSP 1-20
STN, SSN 1-8
STR2, SSR2 1-10
STR2 CN, SSR2 CN 1-8

Place the pump in a frost-free location.

Position the pump horizontally with the outlet ports vertically
upwards to ensure correct operation of the flow switches.

Fig. 5 Positioning the pump

Connect the pump and shower system as shown in fig. 10.
There must be a minimum height between the bottom of the cold-

water storage tank and the highest point of the outlet pipe or the
shower outlet of at least 250 mm. See fig. 6.

English (GB)

TM05 6969 0313TM05 6967 0313TM05 6975 0313

Fig. 3 Inlet head

Fig. 4 Unrestricted pipe

TM05 6968 0313

Fig. 6 Minimum height difference

Install the pump in accordance with the Water Supply (Water
Fittings) regulations 1999.

Position the pump at the base of the hot-water cylinder. See fig.

7.

TM05 6976 0313

Fig. 7 Positioning the pump in relation to hot-water cylinder

For installation within a bathroom, locate the pump in accordance
with local regulations.

Position the pump at least 0.6 metres horizontally away from or 3
metres vertically above floor from any bath, shower tray or basin.

The pump may be fitted under a bath, providing this
space is only accessible through the use of a tool.

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4.1.1 Foundation

> 227 litres
(50 gallons)

> 227 litres
(50 gallons)

English (GB)

Install the pump on a vibration-free foundation. In case of wooden
floors use a small concrete foundation of approx. 225 x 225 mm
and 40 to 50 mm thick.

Fig. 8 Foundation

4.2 Pipes

Do not allow any solder flux to come into contact with
any of the plastic parts of the pump.

Use 22 mm pipes to and from the pump.

• The expansion pipe from the hot-water cylinder should always
rise in order to prevent trapped air.

• The outlet pipe from the pump to the shower valve should rise,
where possible, to prevent trapped air.

• Pipes from the pump to the shower valve should go up and
over, rather than under floor.

• Do not fit any other outlets in the inlet pipes to the pump. See
fig. 12.

• Use dedicated supplies to hot and cold water.

• Avoid blanked-off pipes.

• Avoid restrictions in the flexible hoses.

• Secure down all pipes to minimise noise and vibration.

TM05 6987 0313 - TM05 6988 0313

TM05 6974 0313TM05 6972 0313

Fig. 11 Fixing the pipes

Fig. 9 Solder flux causes damage to plastic parts

Fig. 10 Pipe connection to hot-water cylinder

TM05 7319 1113TM05 6989 0313

Fig. 12 Pipe installation examples

4.2.1 Hot-water cylinder connections

Do not use any jointing compounds.

Connect the supply from the hot-water cylinder to the pump with a
dedicated supply.

Fit a surrey flange to minimise air in the hot-water supply to the
pump.

Use 22 mm pipe to ensure an adequate flow to the pump.

4.2.2 Cold-water supply

Do not connect the pump directly to the water mains
supply.
Do not use any jointing compounds or tape.

Connect the pump with a dedicated supply using 22 mm pipe
from the cold-water storage tank.

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4.3 Cold-water storage tank

Min. 25 mm

> 227 litres
(50 gallons)

Supply to hot-water
cylinder

Cold water

Mains

Position the cold-water outlet at least 25 mm lower than the
supply to the hot-water cylinder to prevent the supply of hot water
only.

The cold-water storage tank must be equal to or larger than 227
litres (50 gallons).

Do not position outlets in the cold-water storage tank
directly below the inlet from the water mains supply
in order to prevent air from being drawn into the
pump or hot-water cylinder.

Fig. 13 Cold-water storage tank

4.4 Valves and strainers

Non-return valves

Do not fit non-return valves in the inlet pipe to the pump.

Strainers

Fit the strainers supplied with the STR2 and SSR2 on the inlet
connections. See fig. 16.

1. Fit the strainer washer to the inlet connection.

2. Fit the plain hose washer to the outlet connection.

English (GB)

TM05 6966 4614TM05 7323 1213

TM05 7320 1113TM05 7321 1113

Fig. 16 Fitting the strainer washer

Fig. 14 Correct fitting of non-return valves

Isolating valves

Fit full-bore isolating valves in the pump inlet and outlet ports for
easy installation, servicing and cleaning of strainers.

Isolating valves assist draining down, strainer
cleaning and refilling.

Fig. 15 Fitting of isolating valves

3. Insert the strainer basket supplied with the SSN, SSP, STN

and STP in the inlet pipe.

Fig. 17 Fitting the strainer basket

TM05 7323 1213

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4.5 Connecting the pump

Max. 45

0

90

0

+

33 mm

1

2

English (GB)

Do not use any jointing compounds or tape.

Use the flexible hoses supplied for connecting the pump to the
pipes. Use of these hoses will ensure strain- and vibration-free
watertight connections.

Ensure unrestricted flow in the flexible hoses.

Fig. 18 Connecting the flexible hoses

Line up the pipes and fit hoses to the pump before connecting to
pipes.

Disconnecting the hose

To disconnect the "push-fit" hose, firmly push down the retaining
ring while pulling out the hose.

Fig. 21 Disconnecting of flexible hoses with push-fit

connection

4.6 Temperature setting

Maximum hot-water temperature setting must not exceed 60 °C in
accordance with BS 6700:2006, to eliminate the risk of lime scale
and cavitation.

4.7 Installation options

This section gives you an overview of your options during
installation.

TM05 7302 0913 - TM05 7303 0913

Positioning the pump

• Inlet head of at least 1 m is required for SSP, STP, SSN, STN
and STR pumps.

• Fit a downward loop of at least 450 mm if the pump is
positioned above the hot-water cylinder. See fig. 22.

TM05 7306 0913TM05 6975 0313

The pump must not be subject to mechanical strain.

Plastic nuts should be finger-tight plus 1/4 turn. Re-tighten the
nuts after hot water has been pumped for the first time.

Fig. 19 Tightening the connections

Push-fit connections (SSN, SSP, STN and STP pumps)

Use the flexible hoses supplied with the pump for the pump inlet
and outlet ports.

Insert the hose connection to a minimum depth of 33 mm.

Fig. 22 Pump positioned above hot-water cylinder

Pipes

• 15 mm pipes can only be used on STR2 and SSR2 pumps up
to 1.5 bar rated pressure.

• Where high flows are expected, we recommend 28 mm.

Electrical installation

• The low-voltage pump installation kits are supplied with 3
metres of connecting lead. The connecting leads between the

TM05 7304 0913TM05 7305 0913

about 15 metres. Use min. 1.0 mm

pump and the isolating transformer can be extended up to

2

cable.

Flanges

• Either Surrey, York, Warix or Essex flanges can be used for
the hot-water cylinder, depending on the cylinder type and
installation.

Fig. 20 Installation with push-fit connection

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5. Electrical installation

ON

NL

L N

Min. 3 mm

1 

I/ON

DANGER
Electric shock

Death or serious personal injury

- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.

DANGER
Electric shock

Death or serious personal injury

- The unit must be connected to a switched spur
fused at 5 A (10 A on models STP 4.0 B and STN

4.0 B) with a minimum contact gap of 3 mm in all
poles.

- Metal pipes must be earthed by the use of earthing
clamps and 4 mm

951.

2

earthing wire, according to BS

1 x 230 V, 50 Hz

1. Strip off the insulation cap and the leads as specified for the
switched spur.

Observe colour coding as follows:

• Brown to terminal L.

• Yellow and green to terminal E (PE).

Ensure that the earth lead is at least as long as the other two
leads.

• Blue to terminal N (neutral).

English (GB)

DANGER
Electric shock

Death or serious personal injury

- Connect the pump to a socket with earth
connection.

- We recommend that you fit the permanent
installation with an earth leakage circuit breaker
(ELCB) with a tripping current ≤ 30 mA.

Complete all pipe installation before making any
electrical connections.
Do not allow any water to enter into the electrical
terminal box.

The electrical installation must be carried out by an
authorised person in accordance with local
regulations.

Check that the supply voltage and frequency correspond to the
values stated on the nameplate.

TM05 7316 1013

Fig. 23 Electrical connection

2. Insert the lead fully into the terminal connector and tighten the
screw firmly.

3. Ensure that the connection is secure.

4. Tighten the cable restraint.

Follow the procedure for startup before switching on
the power supply.

Ensure compliance with IEE regulations.

DANGER
Electric shock

Death or serious personal injury

- Fit the terminal box cover before you switch on the
power supply.

The pump switch should be left in "on" position at all times for
normal operation of the system.

TM05 7309 0913

Fig. 24 Electrical supply permanently on

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