Grundfos.bk Page 1 Wednesday, September 3, 2008 1:36 PM
Shower pump
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Grundfos.bk Page 2 Wednesday, September 3, 2008 1:36 PM
Declaration of Conformity
We Grundfos declare under our sole responsibility that the products SSL,
STL, STC, SSR, STR, SSP, STP, SSN and STN, to which this declaration
relates, are in conformity with the Council Directives on the approximation
of the laws of the EC Member States relating to
— Machinery (98/37/EC).
— Electrical equipment designed for use within certain voltage limits
(2006/95/EC).
Standards used: EN 60335-1: 2002 and EN 60335-2-41: 2003.
— Electromagnetic compatibility (2004/108/EC).
Bjerringbro, 20th December 2007
Svend Aage Kaae
Technical Director
2
Grundfos.bk Page 3 Wednesday, September 3, 2008 1:36 PM
CONTENTS
Page
1. Symbols used in this document 3
2. General 3
2.1 Type key 3
3. Important instructions 3
4. Positioning the pump 4
4.1 Negative head 4
5. Hot-water cylinder connections 4
6. Cold-water supply 4
7. Connecting the pump 4
7.1 STC, STR, SSR, STL and SSL pumps 4
8. Electrical connections 5
8.1 Electrical connection, 1 x 230 V, 50 Hz 5
8.2 Electrical connection, low-voltage pumps (STL, SSL and
STL 2.0 CN) 5
9. Before using the pump 5
10. Negative-head pumps 6
10.1 General 6
10.2 Dry-running protection 6
10.3 Connecting the pump 6
10.4 Installation instructions 6
10.5 Pressure and flow control 6
10.6 Operating instructions 6
10.7 Maintenance 6
11. Fault finding chart 7
11.1 Fault finding, negative-head pumps (STN, SSN and STL
2.0 CN) 8
12. Technical data 9
13. Service 11
14. Disposal 11
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
1. Symbols used in this document
Warning
If these safety instructions are not observed,
it may result in personal injury!
If these safety instructions are not observed,
Caution
Note
it may result in malfunction or damage to the
equipment!
Notes or instructions that make the job easier
and ensure safe operation.
2. General
These installation and operating instructions apply to the
Grundfos Shower Pumps, types STL, SSL, STC, STR, SSR, STP,
SSP, STN and SSN.
For supplementary instructions regarding negative-head pumps,
see section 10. Negative-head pumps.
Your shower pump has been designed, manufactured and
carefully tested in England.
If correctly installed and not misused, it will give many years of
reliable service.
A shower pump installation requires a cold-water storage tank
and a hot-water cylinder. See fig. 2, page 12.
Low-voltage shower pumps
All transformers are fitted with auto-resetting thermal cut-outs.
If the transformer overheats for any reason, the thermal cut-out
will switch the pump off. The cut-out will automatically switch the
pump on again when the transformer has cooled down.
For the STL 2.0 CN pumps, also read the instructions in section
10. Negative-head pumps.
Please dispose of any packaging supplied with
Note
this pump in an environmentally friendly and
legal manner.
2.1 Type key
Example S T P 2.0 B
S: Shower pump range
T: Twin impeller
S: Single impeller
P: Positive head
N: Negative head
L: Low voltage
C: Centrifugal
R: Regenerative
Maximum head [bar]
Material:
B: Brass
C: Composite
CN: Composite, negative head
3. Important instructions
Do not connect the pump directly to the water
mains supply.
Caution
Note
• A supply head of at least 2 metres is recommended.
• Non-return valves
Do not fit non-return valves in the suction line to the pump.
Make sure that the pump can vent back to the supply tank.
• STC, STR, SSR, STL and SSL pumps
The strainers supplied with the pump must be used on suction
connections. See fig. 1, page 4.
• Push-fit connections (SSN, SSP, STN and STP pumps)
The pump suction and discharge ports are fitted with push-fit
connections. The flexible hoses supplied with the pump must
be used.
Make sure that each hose connection is fully inserted to a
minimum depth of 33 mm.
The hot-water supply to the pump suction port should be
connected from the first outlet from the hot-water cylinder
expansion pipe, i.e use a Surrey flange.
• Disconnecting hose
To disconnect the "push-fit" hose, firmly push down the white
or grey retaining ring, while pulling out the hose.
• No solder flux
Do not allow any solder flux to come into contact with any of
the plastic parts of the pump.
• Do not let the pump run dry
Purge with water thoroughly for 5 minutes before running the
pump.
• Test the system
After completing installation, the whole system must be
thoroughly tested – operating both hot and cold water at
maximum flow.
Maximum hot-water temperature setting must not exceed
60 °C (140 °F) in accordance with BS 6700: 2006.
Finally check that each connection is watertight and not
leaking.
The pump cannot normally be used with
combination boilers.
Make sure that no foreign particles (such as
solder, dust, etc.) are allowed to enter the pump.
The pump cannot operate if the level of the water
in the cold-water storage tank is below the level
of the pump.
3
Grundfos.bk Page 4 Wednesday, September 3, 2008 1:36 PM
4. Positioning the pump
Select a position for installing the pump which
Note
Minimum inlet pressure: 2 metres (recommended).
Keep the pump as close as possible to the source of hot and cold
water.
For optimum performance, ensure
• a good water flow to the pump
• sufficient head
• unrestrictive pipework
• provision to prevent air locks.
Place the pump in a well-ventilated location, e.g. on the floor of
the airing cupboard.
Caution
Caution
The pump must be mounted horizontally with discharge ports
vertically upwards to ensure correct operation of the flow
switches.
To reduce noise, we recommend the pump be mounted on a
small concrete foundation of approximately 225 x 225 mm and
40-50 mm thick.
Connect the pump and shower system as shown in fig. 2,
page 12.
To achieve 0.5 l/min. to turn the flow switches on, there must be a
minimum height between the water level in the cold-water storage
tank and the shower outlet of approximately 250 mm. See fig. 2,
page 12.
The pump must be installed in accordance with the Water Supply
(Water Fittings) Regulations 1999.
For installation within a bathroom, locate the pump in accordance
with the IEE Wiring Regulations seventeenth edition (BS 7671:
2008) Part 6 Section 601 for a shower pump with an IPX2
enclosure. The pump must be positioned at least 0.6 metres
horizontally or 3 metres vertically away from any bath, shower
tray or basin.
affords easy access for subsequent servicing
and maintenance.
Do not cover the pump, otherwise the motor will
overheat.
The pump must be placed in a frost-free location.
Warning
The pump may be fitted under a bath, providing
this space is only accessible through the use of
a tool. If in doubt, consult the Wiring Regulations.
6. Cold-water supply
Do not connect the pump directly to the water
Caution
The cold-water supply to the pump must be connected using
22 mm pipe to the cold-water storage tank. See fig. 2, page 12.
The tank connector should be positioned at least 25 mm (1”)
lower than the cold-water supply to the hot-water cylinder to
prevent the supply of hot water only.
mains supply.
Do not use any jointing compounds or tape.
7. Connecting the pump
Caution
For ease of installation, subsequent servicing and cleaning of
strainers, full-bore isolating gate valves should be fitted in the
pump suction and discharge ports.
Note
The flexible hoses supplied with the pump must be used for
connecting the pump to the pipework. Use of these hoses will
ensure strain- and vibration-free watertight connections. The
maximum bend angle should not exceed 45 °.
After initial installation, run the pump for a few minutes, switch off,
drain down and clean the suction strainers.
For SSN, SSP, STN and STP pumps, remove the suction hose
from the pump, and the strainer basket can be removed by hand
or with long-nosed pliers.
Line up pipework, and fit hoses to the pump before connecting to
pipes. Position pipework accurately so that the pump is not
subject to mechanical strain.
Plastic nuts should be finger-tight plus 1/4 turn. The nuts should
be retightened after hot water has been pumped for the first time.
Note
7.1 STC, STR, SSR, STL and SSL pumps
The strainers supplied with the pump must be fitted to the pump
suction connections only with the wire dome towards the pump.
See fig. 1.
Do not use any jointing compounds or tape.
Isolating valves greatly assist draining down,
strainer cleaning and refilling, which will result in
much lower service costs.
Do not bend hoses as this will cause restriction
of flow.
4.1 Negative head
If the water level in the cold-water storage tank is below the level
of the shower outlet, this is called a negative-head system. To
enable the pump to operate, a negative-head pump must be
used. See section 2.1 Type key.
If the pump is positioned above the outlet of
Note
the hot-water storage cylinder, ensure that the
pipework to the pump from the cylinder has a
downward loop. This will help prevent air locks.
5. Hot-water cylinder connections
Caution
The use of a Surrey flange (see fig. 2, page 12) is recommended
to ensure a free-flowing supply of air-free hot water.
The hot-water supply may be taken directly from the top of the
hot-water cylinder, but entrapped air may cause problems.
22 mm copper pipe should be used to ensure an adequate flow to
the pump. Where high flows are expected, 28 mm is
recommended.
Do not use any jointing compounds.
Discharge
Suction
Fig. 1 Fitting the strainer
Suction
strainer
Discharge
connection
TM04 02 0203 5107
4
Grundfos.bk Page 5 Wednesday, September 3, 2008 1:36 PM
8. Electrical connections
Warning
The pump must be earthed.
The pump must be connected to an external
mains switch with a contact separation gap
of at least 3 mm in each pole.
The pump must be connected to a 230 V, 50 Hz,
supply with a switched spur fused at 5 A
(10 A on models STP 4.0 B and STN 4.0 B).
Metal pipes must be earthed by the use of
earthing clamps to BS 951 and 4 mm earthing
wire.
Complete all pipework before making electrical
Caution
If in doubt, consult a qualified electrician or call your local
electricity board engineer.
8.1 Electrical connection, 1 x 230 V, 50 Hz
Observe colour coding as follows:
• Brown to terminal L.
• Yellow/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).
Insert the lead fully into the terminal connector and tighten the
screw firmly. Ensure that the connection is secure. Be sure to
tighten the cable restraint.
Ensure compliance with IEE Regulations. In the interests of
safety, it is recommended that a residual current device (RCD)
be installed in the supply circuit.
The pump switch should be left "on" at all times for normal
operation of the system.
connections.
Do not allow any water to enter into the electric
terminal box.
Warning
Do not operate the pump without terminal box
cover in place.
Ensure compliance with IEE Regulations.
Observe colour coding as follows:
• Brown to terminal L.
• Blue to terminal N.
For normal operation of the shower, the transformer can be left
permanently switched on – very little power is used when the
pump is not running.
Copper pipes should have supplementary earth bonding. Where
the earth continuity has been broken, the pump suction and
discharge pipework should be connected with earthing clamps to
BS 951 and 4 mm earthing wire.
9. Before using the pump
Warning
Do not let the pump run dry.
Purge water thoroughly through the system
before switching on the electricity supply to
the pump.
Do not switch on the electricity supply.
1. Turn on the water supply. Allow the system to fill.
2. Immediately inspect for any leaks.
3. With pump not running, allow maximum water flow, for
example remove handset from shower hose, letting the
shower hose hang into the shower tray or bath. Operate
maximum hot and cold flow for at least 2 minutes, to flush out
all debris and ensure air is thoroughly purged from the system.
4. Switch on the electricity supply to the pump. Again operate the
pump in both full hot and cold modes for about 2 minutes.
5. With the pump operating, carefully inspect again for any leaks
from all connections on both hot- and cold-feed pipes to the
pump and to the system.
After hot water has been run for several minutes, check all
hot-water connections and make sure that there are no leaks.
6. The first few times the pump is used, the insulating varnish
used on the pump motor may give off an odour. This is
perfectly normal and will diminish with use.
8.2 Electrical connection, low-voltage pumps
(STL, SSL and STL 2.0 CN)
Use the transformer supplied.
Caution
The low-voltage pump has added electrical protection via a safety
isolating transformer. See fig. 3, page 13, or fig. 4, page 14.
For installations where the pump has to be placed in the
bathroom (for example under the bath), we recommend that
the safety isolating transformer is placed outside the bathroom or
shower area.
The low-voltage leads from the transformer must be connected to
the two terminals marked "T" in the terminal box. As the supply is
AC, the leads can be connected to either terminal on the pump.
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 1.0 mm cable.
The safety isolating transformer must be connected to a
230-240 V, 50 Hz, supply voltage with a switched spur fused
at 5 A. The switch must have a double-pole disconnection with
a separation gap of at least 3 mm. See fig. 3, switched spur.
Do not connect the pump directly to 240 V.
Electrical hazard will result and the motor will be
irreparably damaged.
Warning
Do not locate 230-240 V connections, plugs or
switches within the "wet" area in accordance
with IEE Regulations.
5
Loading...