Grundfos STR2 User manual

Shower pumps
SSR2, SSR2 CN, STR2, STR2 CN, SSP, STP, SSN and STN
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

2

Table of contents
3
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)
4
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)
5
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)
6
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
T:
S:
Twin impeller
Single impeller
P:
N:
L:
C:
R:
Positive head
Universal (negative) head
Low voltage
Centrifugal
Regenerative
Maximum head [bar]
Material:
B:
C:
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)
7
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.
7.
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)
8
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)
9
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)
10
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
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