Grundfos STR2 User manual

Shower pumps

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

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

Table of contents

Shower pumps

English (GB)

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

Türkçe (TR)

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

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

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

English (GB)

English (GB) Functional profile and user manual

Original installation and operating instructions

CONTENTS

Page

1. General information

1.1 Hazard statements

The symbols and hazard statements below may appear in

Grundfos installation and operating instructions, safety

instructions and service instructions.

The hazard statements are structured in the following way:

1. General information 4

1.1 Hazard statements 4

1.2 Notes 5

2. Safety instructions 5

2.1 Electrical installation 5

2.2 Fault finding 5

3. General description 6

3.1 Applications 6

3.2 Type key 6

4. Installation 6

4.1 Positioning the pump 7

4.2 Pipes 8

4.3 Cold-water storage tank 9

4.4 Valves and strainers 9

4.5 Connecting the pump 10

4.6 Temperature setting 10

4.7 Installation options 10

5. Electrical installation 11

6. Startup 12

6.1 Shaft seal run-in 12

7. Universal-head pumps 13

7.1 General description 13

7.2 Dry-running protection 13

7.3 Connecting the pump 13

7.4 Operating instructions 13

7.5 Installation options 13

8. Technical data 14

9. Fault finding 15

9.1 Positive-head pumps (STP, SSP, STR2, SSR2) 15

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

SSR2 CN) 16

10. How it works 17

10.1 Universal-head pumps 17

11. Engineer check list 17

12. Maintenance and service 17

13. Disposal 17

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.

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.

English (GB)

1.2 Notes

The symbols and notes below may appear in Grundfos

installation and operating instructions, safety instructions and

service instructions.

2. Safety instructions

2.1 Electrical installation

2.2 Fault finding

Observe these instructions for explosion-proof

products.

A blue or grey circle with a white graphical symbol

indicates that an action must be taken.

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.

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

mm2earthing wire, according to

BS 951.

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.

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.

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.

English (GB)

3. General description

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

4. Installation

The system in which this product is incorporated must be

designed to meet the pumps requirements.

Symbols used in illustrations

Fig. 1 Do not connect directly to the mains.

Fig. 2 Connection to mains via storage tank

Example S T P 2.0 B

S: Shower pump

Twin impeller

Single impeller

Positive head

Universal (negative) head

Low voltage

Centrifugal

Regenerative

Maximum head [bar]

Material:

CN:

Brass

Composite

Composite, universal (negative) head

Symbol Description

Cold-water storage tank

Hot-water cylinder

Shower pump

Shower head

Tap or outlet

Hot water

Cold water

Mains supply pipe

> 227 litres

(50 gallons)

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 cold-

water storage tank is below the pump.

TM05 6978 0313TM05 6977 0313

> 227 litres

(50 gallons)

English (GB)

4.1 Positioning the pump

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.

Fig. 3 Inlet head

Fig. 4 Unrestricted pipe

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.

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.

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.

Select a position for installing the pump which affords

easy access for subsequent servicing and

maintenance.

Type Inlet head [m]

STP, SSP 1-20

STN, SSN 1-8

STR2, SSR2 1-10

STR2 CN, SSR2 CN 1-8

TM05 6968 0313

TM05 6976 0313

=Hinlet

> 227 litres

(50 gallons)

Do not cover the pump; otherwise, the motor will

overheat.

Place the pump in a frost-free location.

TM05 6969 0313TM05 6967 0313TM05 6975 0313

The pump may be fitted under a bath, providing this

space is only accessible through the use of a tool.

> 227 litres

(50 gallons)

Min. 250 mm

English (GB)

4.1.1 Foundation

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

Fig. 9 Solder flux causes damage to plastic parts

Fig. 10 Pipe connection to hot-water cylinder

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.

Fig. 11 Fixing the pipes

Fig. 12 Pipe installation examples

4.2.1 Hot-water cylinder connections

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

Connect the pump with a dedicated supply using 22 mm pipe

from the cold-water storage tank.

TM05 6987 0313 - TM05 6988 0313

Do not allow any solder flux to come into contact with

any of the plastic parts of the pump.

TM05 7319 1113TM05 6989 0313

> 227 litres

(50 gallons)

TM05 6974 0313TM05 6972 0313

Do not use any jointing compounds.

Do not connect the pump directly to the water mains

supply.

Do not use any jointing compounds or tape.

> 227 litres

(50 gallons)

English (GB)

4.3 Cold-water storage tank

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).

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.

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.

Fig. 15 Fitting of isolating valves

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.

Fig. 16 Fitting the strainer washer

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

and STP in the inlet pipe.

Fig. 17 Fitting the strainer basket

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.

TM05 6966 4614TM05 7323 1213

Isolating valves assist draining down, strainer

cleaning and refilling.

TM05 7323 1213

Min. 25 mm

> 227 litres

(50 gallons)

Supply to hot-water

cylinder

Cold water

Mains

TM05 7320 1113TM05 7321 1113

English (GB)

4.5 Connecting the pump

Use the flexible hoses supplied for connecting the pump to the

pipes. Use of these hoses will ensure strain- and vibration-free

watertight connections.

Fig. 18 Connecting the flexible hoses

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

pipes.

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. 20 Installation with push-fit connection

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.

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.

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

pump and the isolating transformer can be extended up to

about 15 metres. Use min. 1.0 mm2cable.

Flanges

• Either Surrey, York, Warix or Essex flanges can be used for

the hot-water cylinder, depending on the cylinder type and

installation.

Do not use any jointing compounds or tape.

Ensure unrestricted flow in the flexible hoses.

TM05 7302 0913 - TM05 7303 0913

The pump must not be subject to mechanical strain.

TM05 7304 0913TM05 7305 0913

Max. 45 0

90 0

33 mm

TM05 7306 0913TM05 6975 0313

This manual suits for next models

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