Bristan ST PUMP 20SG Guide

Installation, Operation & Maintenance
Instructions
Please leave this instruction booklet with the home owner as it contains important
guarantee, maintenance and safety information.
Read this manual carefully before commencing installation.
This manual covers the following products:
Standard 2.0 bar Single
Standard 1.5 bar Twin
Pt. No. ST PUMP 20SG Pt. No. ST PUMP 15TN
Standard 2.0 bar Twin
Pt. No. ST PUMP 20TN
FOR POSITIVE HEAD APPLICATIONS
Please note images are representative only and may not portray
your model

CONTENTS
1PRODUCT OVERVIEW........................................................................................ 1
2WARNINGS ........................................................................................................2
3CHECKLIST.........................................................................................................4
4IMPORTANT FACTS - READ BEFORE COMMENCING PUMP INSTALLATION .......5
5LOCATION - GENERAL .......................................................................................7
6PUMP CONNECTIONS ...................................................................................... 12
7ELECTRICAL INSTALLATION............................................................................. 18
8COMMISSIONING .............................................................................................22
9MAINTENANCE.................................................................................................23
10 TECHNICAL SPECIFICATION (Single models)...................................................24
11 TECHNICAL SPECIFICATION (Twin models).....................................................25
12 TROUBLE SHOOTING GUIDE............................................................................27
13 DECLARATION OF CONFORMITY.....................................................................30

1
1 PRODUCT OVERVIEW
1.1 Product Description
2.0 bar Single, 1.5 bar Twin & 2.0 bar Twin
Electric motor driven single or twin ended peripheral pumps complete with an
automatic control system, consisting of flow switches and electronic controls.
1.2 Application
Bristan shower pumps are designed for single or multiple (up to 4) outlet pressure
boosting applications, within one bathroom, subject to correct specification and
pump sizing in vented stored water systems. Inlet pressures to the pump and
ambient temperatures must not exceed the values given in the technical
specifications.
Bristan shower Single pumps are not suitable for boosting a single side of a dual
flow mixer valve or tap. Consult Bristan for an alternative pump.
1.3 Storage
If this product is not to be installed immediately on receipt, ensure that it is stored
in a dry, frost and vibration free location in its original packaging.
1.4 Environment Protection
Your appliance contains valuable materials which can be recovered or recycled.
At the end of the products’ useful life, please leave it at an appropriate local civic
waste collection point.

2
2 WARNINGS
• This pump set must not be used for any other application
without the written consent of Bristan Limited and in particular,
must not be connected directly to the mains water supply.
•
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.
•
The motor casing can become very hot under normal operating
conditions. Care must be taken to ensure it cannot be touched
during operation.
•
The electrical installation must be carried out in accordance
with the current national electrical regulations.
•
The electrical installation must be installed by a qualified
person.
•
In the interests of electrical safety a 30 mA residual current
device (R.C.D. not supplied) should be installed in the supply
circuit. This may be part of a consumer unit or a separate unit.
•
Maximum head (closed valve) ST PUMP 15TN - 15 metres, ST
PUMP 20TN - 20 metres & ST PUMP 20SG - 20 metres.
•
Before starting work on the electrical supply ensure power
supply is isolated.
•
DO NOT allow the supply cord to contact hot surfaces, including
the motor shell, pump body or pipework. The cord should be
safely routed and secured by cable clips.
•
This appliance must be earthed via the supply cord, which must
be correctly connected to the earth point located in the
terminal box.
•
Do not remove terminal box cover. No user serviceable parts
inside terminal box. Any service work involving the removal of
the terminal box cover must only be undertaken by Bristan Ltd
or by one of their approved repairers, or similarly qualified
persons in order to avoid a hazard.

3
• If the supply cord is damaged, it must be replaced by Bristan
Ltd or by one of their approved repairers, or similarly qualified
persons in order to avoid a hazard.
Please read installation details carefully as they are intended to ensure this
product provides long, trouble free service. Failure to install the unit in
accordance with the installation instructions will lead to invalidation of the
guarantee.

4
3 CHECKLIST
IMPORTANT: With the pump removed from its packaging check for any damage
prior to installation. If any damage is found contact Bristan Ltd within 24 hours of
receipt.
Figure 1
Note: This image is for reference only.
Item Description Qty
A Pump 1
B ISO hose & integral washer 2(1)
C Plain hose & integral washer 2(1)
Your product may vary slightly from the illustration above.
The quantities shown above are for twin pumps, (single pumps are shown in
brackets).
A
B
C

5
4 IMPORTANT FACTS - READ BEFORE COMMENCING PUMP INSTALLATION
4.1 Water Storage Capacity
The hot and cold water storage capacity must be sufficient to meet the flow rates
required by the pumped equipment and any other water using fittings and
appliances, which may be operated simultaneously.
Ensure the pump is primed as described in the priming section before starting,
damage to the shaft seal will result otherwise. See Section 8 - Commissioning.
4.2 Water Temperature
The water entering the pump must be controlled as follows:
• The maximum allowable water temperature is65 °C.
• The minimum allowable water temperature is4 °C.
•DO NOT fit a pump ifthehot water isheated via a method
whereby thewater temperature cannot becontrolled, such as
solar orsolid fuel you must consult the Bristan Care helpline on
0300 026 6273.
4.3 Minimum Flow
For this pump to operate correctly there must be a minimum gravity flow of at
least 0.8 l/min through all outlets to be pumped.
4.4
Pipework – General
Secure pipework: Ensure pipework to and from pump is independently supported
& clipped to prevent forces being transferred to inlet and outlet branches of
pump.
Flux: Solder joints must be completed and flux residues removed prior to pump
installation (flux damage will void any guarantee).
Pipework design: Care should be taken in the design of pipework runs to minimize
the risk of air locks e.g. use drawn bends rather than 90° bends.
•DO NOT introduce solder flux to flexible hoses, pumps or pump
parts manufactured from plastic.
•DO NOT allow contact with oil or cellulose based paints, paint
thinners or strippers, acid based descalents or aggressive
cleaning agents.
•DO NOT install a non-return valve, or devices which contain non-
return valves, in the suction (inlet) pipework to the pump. The
pump must be free to vent to the supply tank at all times.
•DO NOT bend the flexible hoses beyond 30°. They must be
installed as straight as possible.
•DO NOT
connect this pump to the mains water supply.

6
4.5 Plumbing Installation Regulations
The plumbing installation must comply with the current water and building
regulations.
The plumbing installation must be installed by a qualified person.

7
5 LOCATION - GENERAL
• Access : For emergencies and maintenance the pump must be
easily accessible.
• Protection : The pump must be located in a dry position, frost free
and protected from freezing, particularly when installed in a loft
(not recommended).
• Ventilation : Ensure an adequate air flow to cool the pump.
Separate the pump from other appliances that generate heat. An
80 mm (3 ") air gap must be maintained around the pump.
• Safety : The motor casing can become very hot under normal
operating conditions. Care must be taken to ensure it cannot be
touched during operation.
• Water retention : Site the pump in a location where in the unlikely
event of a water leak, any spillage is contained or routed to avoid
electrics or areas sensitive to water damage.
• Static inlet pressure : Before deciding where to locate the unit,
check to ensure the static inlet head between pump and the
bottom of the cold water tank (Figure 4 and Figure 5), is at least
0.5 metres and does not exceed the max inlet head of 10 metres
or 13 metres depending on the model (See Sections 10 and 11 –
Technical Specifications).
• Ambient temperature : The pump must be sited in a location
where the maximum ambient temperature does not exceed
40 °C.
• Pipework : For optimum performance pipework MUST be 22 mm.
Pipework should only reduce to 15 mm when entering terminal
fitting.
• Noise : If supplied the anti-vibration mounting feet and flexible
hoses can be used to reduce noise transmission, however care
must be taken when mounting the pump that any noise is not
amplified through loose panels or pipework.
Do not screw down
the pump
.
• Direction of flow : Ensure the water flow is in the direction of the
arrow that is marked on the flow switch reed clamp (vertically
upwards).
• Flexible hoses : Only use the Bristan hose set supplied with the
pump.
• Isolating valves : Separate system isolating valves (non restrictive)
must be fitted to allow easy pump service.
• Inline strainer: You MUST ensure the inlet pipework is fitted with
an inline strainer.

8
5.1 Preferred Pump Location
The pump must, for optimum performance, be sited as close as possible to and
never more than 4 metres from the HOT WATER cylinder. The pump should always
be sited BELOW the HOT WATER take-off from the cylinder. The pump location is
also dependent on limitations of the static inlet and outlet heads of the
installation. For guidance on limitations and recommended location, consult the
following relevant section for hot or cold water installation.
Location – Single Pump
Figure 2
Location – Twin pump
Figure 3
Standard Twin Pump System
Max static inlet pressure 13m
Outlet head must be below
bottom of cold water tank
and be able to pass a
minimum of 1 litre/min
gravity flow
Max static inlet pressure 13m
Outlet head must be below
bottom of cold water tank
and be able to pass a
minimum of 1 litre/min
gravity flow
Either end of a twin pump
may be used to pump the
hot or cold supply

9
5.2 Non-Preferred Pump Location
If it is necessary to position the Pump above the secondary tapping on the hot
cylinder it is fed by, the risk of introducing air will be increased.
To avoid this risk one of the two following solutions must be adopted:
a. The use of a Top Entry cylinder flange.
b.
The use of a Stuart Side Entry cylinder flange, which should have the
addition of an inverted loop (“U” bend) of 350 mm minimum drop
before rising to the pump, located as close as possible to the
cylinder wall. This will ensure the pump receives an air free supply
and the cylinder vents any air up the vent pipe and not the pump
feed (Figure 2 and Figure 3).
Figure 4
Single Pump
200mm
min
Least preferred
area
350mm
min
Max static inlet pressure 13m
Min static inlet pressure 0.5m

10
Figure 5
Twin Pump
200mm
min
Least preferred
area
350mm
min
Max static inlet pressure 13m
Min static inlet pressure 0.5m

11
5.3 Cold Water Connection
The cold water supply: Must be a DEDICATED AIR FREE supply via a tank
connector, and must be positioned at a slightly lower level (25 mm minimum) than
the feed pipe to the hot water cylinder.
Ensure that the pipework size from the cold water tank is 22mm minimum.
Do not connect to the mains.
5.4 Hot Water Connection
Hot water cylinder or storage tank: When a hot water cylinder or storage tank is
used, ensure the pipework size from the cold water storage to the hot water
storage is of adequate size and a minimum of 22 mm.
Hot water supply: The pump must be supplied with a dedicated feed direct from
the hot water cylinder or storage tank, ensuring an air free connection to the
pump. We recommend the use of either the side entry flange (SE) or a top entry
flange (TE) see Figure 6.
Expansion pipe: Expansion pipe: When the method of connection is to be made
via the expansion pipe, the BASE of the cold water storage tank MUST be at least
1 metre above the connection/take off of the hot water storage cylinder feeding
the pump.
Figure 6
Off expansion
pipe with rising
28mm offset
reducing to
22mm pipework
to pump and
expansion pipe.
Off expansion
pipe with risi
ng
22mm offset
and 22mm
pipework to
pump.
Top Entry flange
(Part No 27800)
with 22mm
pipework to
pump.
Factory installed
G
¾secondary
tapping with
22mm pipework
to pump.
Or
Side Entry
flange (Part No
27900) with
22mm pipework
to pump.
30°- 45°30°- 45°

12
6 PUMP CONNECTIONS
• Do not use stainless steel, chrome or nickel plated pipe with the
flexible hose push-in plumbing connections.
• Do not introduce solder flux into the joint or surrounding area as
connectors will be attacked and will fail.
•
All solder joints should be completed and flux residues removed
before final connection to push-in connections, on the flexible
hose.
•
Do not allow contact with oil or cellulose based paints, paint
thinners or strippers, acid based descalents or aggressive
cleaning agents.
•
Never operate pump with inlet and/or outlet isolating valves in
the closed position. Damage will occur!

13
6.1 Flexible Inlet and Outlet Hoses
The pump inlet and outlet ports are threaded G ¾ M. These ports are provided
with a flat sealing face suitable for use with an appropriately sized flat faced fitting
and fibre or rubber washer. Ensure a water tight seal is achieved when the pump
is both stationary and running.
Figure 7
a. Hoses incorporating integral isolating valves should be applied to the inlet
side of pump to satisfy servicing requirements.
b. Standard hoses with no integral isolating valve should be applied to the
outlet side of pump.
c. Use correct tool for opening and closing integrated isolating valve to
prevent damage.
Please note these valves are of quarter turn design, rotate clockwise to
close and anti-clockwise to open. Failure to comply with these instructions
could lead to valve damage.
d.
WARNING: Pump must not run with valve closed.
e.
Flexible hoses with integral isolating valves do not replace system isolation
valves which must be installed.
Open
Close

14
6.2 Hose to Pump
The pump inlet and outlet ports have fittings which are specifically designed for
connection to the G ¾ female running nuts on the flexible hoses.
The hose end running nut is fitted with a rubber sealing washer which is held
captive within the nut assembly.
Locate the hose into position and screw the nut fully onto the fitting by hand.
Finally nip tight with pliers (4 to 5 Nm) for a water tight seal (do not overtighten).
Figure 8
Flexible hose
Port fitting
G
¾running nut
assembly
Rubber sealing
washer (captive in
nut assembly)

15
6.3 Hose to Pipework
1.
The hoses are fitted with plastic push-in connectors, which must only
be connected with the following:
a.
15 mm diameter copper pipe to BS EN 1057 R250 (half hard)
(Table 3).
b.
15 mm plastic pipe to BS 7291 part 1 and part 2 (Table 1), or part 3
(Table 1) plus internal support sleeve*.
* The internal bore of the plastic pipe must be supported against
collapse with the pipe manufacturers recommended support sleeve
(pipe insert).
c.
Appropriate plumbing fitting that provides a leak tight connection.
Ensure the pipe is free from all score marks and deformities in the
area of the insertion depth (Figure 9) and cut the pipe square,
removing all burrs and sharp edges to prevent damage to the
sealing ‘O’-ring.
Prior to inserting pipe into fitting, mark the insert depth on the wall of
the pipe with a soft pencil at a distance of 31 mm from the end to be
inserted (Figure 9).
Figure 9
15mm pipe
Insert depth = 31mm
Pencil mark

16
2.
Check in the mouth of the fitting that the ‘O’-ring, nylon washer and
collet are in position as shown in Figure 10.
Figure 10
3.
Push the pipe firmly into the fitting, until pencil mark is level with the
top of the collet and the pipe stop resistance is felt. Pull on the pipe to
check it is secure and correctly fitted.
4. To release the joint, push pipe firmly into the fitting, hold the collet
down and gently remove pipe. If the system has been filled with water
care should be taken to isolate the pump and towels used to absorb
spilled water.
6.4 Typical Low Level Installation
In certain installations it may be necessary to install a 90° bend on the inlet or
outlet connections of the pump before the flexible hose to accommodate a low
level installation.
Below are some preferred connection options. All connections seal on the pump
body using a fibre or rubber sealing washer. Tap connector fittings should be used
which must be of an appropriate pressure and temperature rating.
It is essential when using any of the fittings shown below, that a correct water
tight seal is obtained between the pump body and selected fitting and also the
flexible hose and selected fitting. If in doubt contact the fitting manufacturer and
confirm compatibility with the connection to be sealed.
Carefully check connections and pipework for leaks whilst pump running and
stationary before leaving the installation unattended.
Collet
Washer
O
-ring
Flexible hose
Pipe stop

17
Figure 11
If you have any concern either about using push-infittings or should the joint
leak on final test, isolate the water supplies and contact Bristan Care helpline on
0300 026 6273.
Fibre washer
15mm copper pipe
G
¾
F x 15mm elbow
tap connector
15mm compression
to G
¾M
G
¾F flexible hose
(supplied)
Fibre washer
15mm elbow
15mm copper pipe
G
¾F flexible hose
(supplied)
15mm compression
to G
¾M
G
¾F x 15mm
tap connector
15mm stem
elbow
15mm to G
¾M
G
¾F flexible hose
(supplied)
G
¾F x 15mm tap connector with flush central
spigot and rubber sealing washer fitted directly
to the pump terminals
G
¾F x 15mm swivel tap connector with flush
central spigot and rubber sealing washer fitted
directly to th
e pump terminals
Sealing washer (sometimes captured in fitting)

18
7 ELECTRICAL INSTALLATION
• Regulations : The electrical installation must be carried out in
accordance with the current national electrical regulations and
installed by a qualified person.
•
Safety : In the interests of electrical safety a 30 mA residual
current device (
R.C.D. not supplied ) should be installed in the
supply circuit. This may be part of a consumer unit or a separate
unit.
•
Before starting work on the electrical supply ensure power supply
is isolated.
• DO NOT allow the supply cord to contact hot surfaces, including
the motor shell, pump body or pipework. The cord should be
safely routed and secured by cable clips.
• Adjacent pipes : Adjacent suction and delivery pipes should be
fitted with earthing clamps in accordance with current
regulations (Figure 12).
Figure 12
Earth continuity connections
• Earthing : Earthing: This appliance must be earthed via the supply
cord, which must be correctly connected to the earth point
located in the terminal box.
• Pipework : Copper or metallic pipework must have supplementary
earth bonding where the continuity has been broken by flexible
hoses or plastic components.
• Additional earthing : Certain installations may require additional
earthing arrangements such as equipotential bonding. Reference
should be made to the relevant regulations concerning this
subject to ensure compliance.