Stuart Turner Mainboost MB 100SV Guide

- 1 –
Read this manual carefully before commencing installation.
This manual covers all Mainsboost vessels for vertical and horizontal and units.
Mainsboost Installation, Operation &
Maintenance Instructions
Please leave this instruction booklet with the home owner as it contains
important warranty, maintenance and safety information
5
WARRANTY
CE compliant product
MAINSBOOST

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PRODUCT DESCRIPTION
Mainsboost consists of one key assembly, the Mainsboost vessel complete with
upstream line-in kit.
APPLICATION
Mainsboost is designed to offer stored clean, potable cold water under pressure for all
domestic or small commercial applications where mains water is insufficient to offer
consistent and reliable water services.
Installation parameters must not exceed the values given in the technical
specifications.
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.
CONTENTS Page
Checklist ...........................................................4
Introduction .........................................................5
Important Facts – read before commencing installation ......................6
Location ............................................................7
Terminology .........................................................8
Configuration ........................................................9
Installation ..........................................................11
Commissioning ......................................................16
Technical Specification ................................................17
Trouble Shooting .....................................................18
Warranty ...........................................................19

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WARNINGS:
zMainsboost systems must not be used for any
other application without the written consent of
Stuart Turner Limited.
zThis 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.
zChildren shall not play with the appliance.
zCleaning and user maintenance shall not be made by
children without supervision.
zEnsure the floor is sufficiently strong enough to
take the total weight of the unit when full of water
(see Technical Specification section). Take care when
manoeuvring the unit so as not to damage it.
zEnsure the unit is fixed to the floor using suitable
fixings to avoid risk of toppling over.
zTo prevent personal injury, ensure all water pressure
is released from the pressure system prior to
work being performed. Ensure pumps are
disconnected and/or electrically isolated.
zIt is strongly recommended that the system is
protected by a suitable pressure relief valve set at
or below the maximum vessel pressure rating. Failure
to install a pressure relief valve may result in vessel
explosion in the event of a system malfunction or
over pressurisation, resulting in property damage,
serious personal injury or death.
zIf the Mainsboost vessel leaks or shows signs of
corrosion or damage do not use it.
Please read the 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 warranty. These
instructions must be left with the product.

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CHECKLIST
Your product may vary slightly from the illustrations above.
Or
IMPORTANT: Your Mainsboost water performance system will be delivered in a
minimum of two boxes on one pallet. Please check the contents within 24 hours
of receipt and if any component is damaged, please contact Stuart Turner Ltd
immediately.
Package 2
Mainsboost vessel
Fig. 2
1
Package 1b
Upstream line-in kit 35mm, 42mm, 54mm variants
Fig. 1b
61
4
8
5
2
7
3
Package 3
Cradle
(only applicable for horizontal installations with
MB 200SH or MB 250SH models)
Fig. 3
Package 1a
Monobloc 22/28mm Upstream line-in kit
Fig. 1a
1
5
2
3
4

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1 INTRODUCTION
1.1 Congratulations on choosing a Mainsboost system, designed to offer
consistent and reliable water services throughout the property.
1.2 Trademarks & Trade Names
‘Mainsboost’ ‘Mainsboost Plus’ and ‘Mainsboost Charger’ are registered
Trademarks of Stuart Turner Ltd.
1.3 How the Mainsboost System works
The Mainsboost vessel stores water from the rising main in a sealed water
chamber, separated from the air space by a rubber diaphragm and
pressurised to an optimum setting. When water is drawn off by downstream
services, the water from the mains is supplemented by the water from the
Mainsboost unit to provide a balanced supply at consistent pressure to
downstream services.
Item Description Qty Item Description Qty
Package
1a
1 Monobloc unit 1
Package
1b
1¼ “ BSP pressure
gauge 1
2 ¼ “ BSP Pressure gauge 2 2 Lever isolating ball
valve 1
3 Lever isolating ball valve 1 3 Mainsboost vessel
connector fitting 1
4Mainsboost vessel
connector fitting 1 4 6 bar pressure regulating valve 1
522/28mm compression
adaptor 2 5 ¼ x ½ “ BSP Brass bush 1
Item Description Qty 6Y pattern inline
strainer 1
Package
21Mainsboost vessel 1 7 Double check valve 1
Package
31 Cradle 2 8 ¼ “ BSP Pressure gauge 1

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2 IMPORTANT FACTS READ BEFORE COMMENCING INSTALLATION
A Water temperature
This unit is designed for cold water applications only which should not exceed the
following values:
2.11 The maximum allowable water temperature is 35 oC.
2.12 The minimum allowable water temperature is 4 oC.
B Pipework – General
2.13 Secure pipework: Ensure pipework to and from the Mainsboost is
independently supported & clipped to prevent forces being transferred.
2.14 Flux: Solder joints must be completed and flux residues removed prior to
completing the installation (flux damage will void any warranty).
2.15 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 90obends.
C Plumbing Installation Regulations
2.16 The plumbing installation must comply with the current water and building
regulations.
2.17 The plumbing installation must be installed by a qualified person.
D Mainsboost vessel
2.18 Ensure the Mainsboost vessel is installed correctly before operating the unit,
to avoid damage.
Do not attempt to dismantle the Mainsboost vessel
The Mainsboost vessel is pressurised to a pre-set level at the factory see
Section 7.11 – Commissioning for details.

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3 LOCATION  GENERAL
3.11 Access: For emergencies and maintenance the Mainsboost must
be easily accessible.
3.12Protection: The system must be located in a dry position, and
protected from freezing. Avoid environments which have a high
ambient temperature, high humidity or excessive condensation
and salt damage, etc.
3.13 Incoming mains water pressure: An incoming water pressure of at least 2.0
bar is required and should not exceed 5 bar. (If mains pressure is below 2.0
bar the Mainsboost vessel should be supplemented with a pump unit, contact
Stuart Turner for details).
3.14 Ensure that location of the unit allows adequate space to give reasonable
access to all parts to accommodate service/commissioning.
3.15 Pipework: Pipework should be sized to ensure optimum performance of the
system.
3.16 Direction of flow: See Fig. 4 to identify the suction and discharge
connections.

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4 TERMINOLOGY
4.11 Upstream Line-in Kits (ULK)
Monobloc upstream line-in kit:
The Mainsboost Monobloc is a patent pending mains regulating device
and should be installed on the rising main between the stopcock and the
Mainsboost vessel. The Monobloc unit is used on 22mm or 28mm upstream
line in kits.
Upstream line-in kits:
Upstream line-in kits for 35mm, 42mm & 54mm installations use separate
regulating components and should be installed on the rising main between
the stopcock and the Mainsboost vessel.
4.12 System Designation
It is important to understand what upstream and downstream refers to before
starting the installation.
Upstream
The term ‘Upstream’ refers to the system configuration from the consumer’s
stopcock to the point where the supply reaches the inlet port of the
Mainsboost vessel.
Downstream
The term ‘Downstream’ refers to the system configuration from the outlet
tapping on the Mainsboost vessel, along the distribution header (if configured
in this way) and into the distribution pipework and outlets. This includes hot
and cold services where both are present (see Fig. 4).
Fig. 4 System designation
Direction of flow
UPSTREAM
LINE-IN KIT

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5 CONFIGURATION
5.11 Mainsboost is a very flexible solution, offering a packaged system to suit
any type or size of building no matter how large or small the demand.
The following illustrations depict some of the most typical installations.
5.12 Single occupancy application
Use of Mainsboost in a house
offers water on demand whilst
giving maximum flexibility.
As can be seen the upstream
line-in kit has to be fitted on to
the rising main but the vessels
can be fitted wherever there is
a space, for example; utility,
kitchen, upstairs cupboard or
loft, providing adequate
provisions are taken for the
weight, frost protection etc
(Fig 5).
Where height restrictions exist
the MB 200SH and MB 250SH
Mainsboost units can be
supplied suitable for
horizontal installation.
5.13 Multiple occupancy application
Often affected by poor water
supplies Mainsboost offers the
perfect solution.
For multiple occupancy buildings
the upstream line-in kit is located
next to the rising main and sized
to meet the demand of the entire
building. Each apartment then
has its own vessel located within
the property, sized to meet the
apartments own demand
(Fig. 6).
Fig. 5
UPSTREAM
LINE-IN KIT
UPSTREAM
LINE
- IN KIT 
L




d


-g 1/
I

,n
-



I ·� 

�
. 
I,  I


.]
I 

Fig. 6

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5.14 High demand single occupancy application
Where single properties have a much higher demand, it may be necessary to
use additional Mainsboost vessels connected in parallel to ensure sufficient
water is on tap to meet the much higher demand. Fig. 7 shows all vessels
being located in the same place.
5.15 Water softener
NOTE: If a water softener is to be fitted it must be located between the
upstream line-in kit and the vessel. If high pressure is also required to the
drinking tap fit a Stuart Water Conditioner, available from Stuart Turner, rather
than a water softener.
UPSTREAM
LINE-IN KIT
Fig. 7
UPSTREAM
LINE IN KIT
Fig. 8
Water softener

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6 INSTALLATION
Step 1:
Remove the Mainsboost vessel from its packaging and check to ensure it is not
damaged.
zWARNING: depending on vessel size this may require two people to
complete safely.
zEnsure the floor is sufficiently strong enough to take the total
weight of the unit when full of water (see Technical
Specification section). Take care when manoeuvring the unit
so as not to damage it.
6.11 Vertically mounted Mainsboost vessels
a) Carefully turn the vessel on its side using the discarded packaging to
protect it.
b) Once on its side screw the Mainsboost vessel connector provided
in the upsteam line-in kit into the tank elbow at the base using suitable
thread seal such as PTFE tape or liquid thread lock (see Fig. 9).
c) Cut a piece of 28 mm dia. copper pipe to the following minimum length,
ensuring clearance of the base.
Pipe length:
MB 100SV = 210 mm MB 200SV = 270 mm MB 300SV = 270 mm
MB 130SV = 210 mm MB 250SV = 270 mm MB 450SV = 340 mm
Then re-erect the vessel.
d) Fit the isolating valve provided to the tail now protruding from the base of
the vessel.
NOTE: It is good practice to install a drain port between the isolation valve
and the vessel.
e) The vessel assembly should then be positioned and checked to ensure
there is sufficient space to install the upstream line-in kit between the
stopcock and pressure vessel inlet. Refer to the chart (Fig. 17) as a guide.
Fig. 9
Vessel Connector
Isolation Valve

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f) Fix the Mainsboost vessel securely to the floor using appropriately
selected and sized fixings.
6.12 Horizontally mounted vessels
a) Fix the two cradles in place where the unit is to be located in line with
each other per chart shown below.
b) Position the cylinder centrally on the cradles with the outlet elbow facing
upwards.
Dimension between hole centres
Tank size A
200 litre 570 mm
250 litre 740 mm
Fig. 10
Fig. 11
Fig. 12
A
Vertically mounted
vessels

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d) With the vessel on its side screw the Mainsboost vessel connector
provided in the upsteam line-in kit, into the tank elbow using suitable
thread seal such as PTFE tape or liquid thread lock (see Fig. 16).
e Cut a piece of 28 mm dia. copper pipe to the following minimum length,
ensuring clearance of the base.
Pipe length:
MB 100SV = 210 mm MB 200SV = 270 mm MB 300SV = 270 mm
MB 130SV = 210 mm MB 250SV = 270 mm MB 450SV = 340 mm
f) Fit the isolating valve provided to the tail.
NOTE: It is good practice to install a drain port between the isolation valve and the
vessel.
c) Remove the plastic skirt by rotating anti-clockwise to unclip and discard.
NOTE: Horizontal mounting is available for the steel MB 200 SH
and MB 250 SH vessels only.
NOTE: Do not forget if a water softener is to be installed this has
to be included in this pipe run, and additional space must be
allocated for this.
Do not fit smaller pipework than the upstream line-in kit accepts
as this will impair performance.
Fig. 13
Step 1: twist Step 2: unclip
Step 3: pull off
Fig. 14
Fig. 15
Fig. 16
Vessel Connector
Isolation Valve

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Pipe
Size
Minimum pipe length required to install the
Monobloc upstream line-in kit (mm) (A)
22 mm 203 mm
28 mm 203 mm
Step 2a:
Monobloc upstream line-in kit (22mm & 28mm)
The Monobloc upstream line-in kit includes:
1 – Monobloc unit
2 – Pressure gauge (upstream)
3 – Pressure gauge (downstream)
4 – Mainsboost vessel connector (see Step 1)
5 – Isolation valve (see Step 1)
NOTE: the Monobloc can be installed either horizontally or vertically but not upside
down. There are pressure gauge ports on both sides of the Monobloc to allow the
pressure gauges to be visable in any orientation. Follow the directional flow arrows
on the Monobloc to ensure correct installation.
Fig. 17a
32 1
Inlet
A
 


Outlet

- 15 –
Pipe
Size
Minimum pipe length required to install the
upstream line-in kit (mm) (A)
22 mm 480 mm
28 mm 580 mm
35 mm 630 mm
40 mm 735 mm
54 mm 820 mm
Step 2b:
Upstream line-in kits (35mm, 42mm, 54mm)
The upstream line-in kit includes:
1 – inline strainer
2 – pressure gauge (upstream)
3 – double check valve
4 – pressure reducing valve
5 – pressure gauge (fitted to pressure reducing valve)
6 – Mainsboost vessel connector (see Step 1)
7 – Isolation Valve (see Step 1)
The above components must be installed in the correct order to ensure safe and
satisfactory system operation.
Fig. 17b
5
4
3
2 (T-piece not supplied)
1
Inlet
A

- 16 –
Fig. 18
7 COMMISSIONING
7.11 Check vessel pre-charge pressure:
It is important to have the correct pre-charge pressure in the vessel for your
site conditions to optimise performance. The vessel is supplied with a
pre-charge pressure of approximately 1.4 bar (4.0 bar for MB 750SV,
MB 1000SV, MB 1500SV & MB 2000SV models), and should never have a preset
pressure of less than 0.5 bar.
Checking and adjustment to the vessel pre-charge air pressure can only be
carried out when the vessel is empty (contains no water).
7.12 Check mains static pressure:
zClose outlets and check pressure gauge after ‘Y’ strainer – for static
mains pressure and note it. This should be done at peak times of use.
zTurn stopcock off and leave outlet taps open.
7.13 Check the chart below for the correct vessel pressure against the static mains
pressure recorded.
7.14 On completion of the installation, follow the commissioning process below.
zLeave all outlet valves closed.
zTurn on stopcock and open inlet ballvalve, both pressure gauges on inlet
and PRV will start to show movement as the mains pressure fills the
system.
zCheck for leaks on all joints made.
zThe incoming mains pressure will start to fill the vessel with water.
The time taken to fill the vessel will vary depending on the vessel size and
mains water pressure.
Static mains
pressure
Set vessel
pre-charge
pressure to
Differential Set PRV maximum
setting to
bar bar bar bar
< 2.0 If static mains pressure is less than 2 bar a pumped unit
will be required – consult Stuart Turner
2.0 0.5 1.5 2.0
2.5** 0.7 1.8 2.5*
3.0 1.2 1.8 3.0
3.5 1.7 1.8 3.5
4.0 2.2 1.8 4.0
*Adjust pressure regulating valve down to these settings where possible.
**Recommended setting.
Using a pressure gauge check the vessel and adjust to suit through the
schrader valve.
Warning: NOTE PRV setting must not exceed 5.0 bar.

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8 TECHNICAL SPECIFICATION
Mainsboost Vessel
General
WRAS approval 1501305
Approvals WRAS, CE
Warranty 5 years (fittings + ULK 2 years)
Performance
Maximum working pressure* 1000 kPa (10 bar)
Min / Max operating temperature Min 4 oC / Max 35 oC
Max rated temperature 90 oC
Materials Pressure vessel Epoxy coated mild steel
Membrane Butyl rubber
Model
Vessel
capacity
(litres)**
Dimensions (mm) Weight
empty
(Kg)
Weight
filled
(Kg)
Maximum
weight (Kg)
ULK Kit
(mm)
H W D
Steel vessels
vertical
MB 100SV 55.0 890 410 410 19.7 74.7 119.7 22
MB 130SV 71.5 1100 410 410 23.7 95.2 153.7 22
MB 200SV 110.0 1030 535 535 35.7 145.7 235.7 22
MB 250SV 137.5 1210 535 535 40.7 178.2 290.7 22
MB 300SV 165.0 1505 535 535 49.2 214.2 349.2 22
MB 450SV 247.5 1545 660 660 74.2 321.7 524.2 22 or 28
MB 750SV 412.5 1834 756 756 115.9 528.4 865.9 35
MB 1000SV 550.0 2376 806 806 153.5 703.5 1153.5 35
MB 1500SV 825.0 2435 960 960 246.4 1071.4 1746.4 35
MB 2000SV 1100.0 2505 1110 1110 374.3 1474.3 2374.3 35
Steel vessels
horizontal
MB 200SH 110.0 558 540 1026 39.2 149.2 239.2 22
MB 250SH 137.5 558 540 1206 44.2 181.7 294.2 22
*NOTE: The maximum pressure that can be applied to the Mainsboost vessel
under any installation conditions.
**NOTE: At typical working pressure
Stuart Turner reserve the right to amend the specification in line with its policy of
continuous development of its products.

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9 TROUBLE SHOOTING GUIDE
Symptoms Probable Cause Recommended Action
Poor flow ISO valve not opened on
pressure vessel
Check valve is fully open
Filter blocked Isolate system and clean out strainer
Poor pressure Mains pressure dropped Check pressure gauge on supply (2) Fig. 17.
If below 2.0 bar at peak times, recommend use of
Mainsboost Charger pump
PRV set incorrectly Check PRV. Gauge should read between 1.5 and 5.0 bar,
adjust to suit
Note: Mains supply pressure reading has to exceed desired
pressure on PRV.
System works but runs out of
water
Insufficient vessel capacity Call Stuart Turner on [phone]

- 19 –
10 YOUR WARRANTY
Congratulations on purchasing a Stuart Turner Mainsboost system.
We are confident this product will give you many years of trouble free service as
all our products are manufactured to the very highest standard.
Mainsboost vessels are warrantied for five years, fittings including the
Mainsboost Monobloc and other ULK components are warrantied for 2 years.
Within the warranty period we will repair, free of charge, any defects in the
Mainsboost resulting from faults in material or workmanship, repairing or
exchanging the part affected or whole unit as we may reasonably decide.
Not covered by this warranty: Damage arising from incorrect installation,
improper use, unauthorised repair, normal wear and tear and defects which have a
negligible effect on the value or operation of the unit.
Reasonable evidence must be supplied that the product has been purchased
within the guarantee term prior to the date of claim (such as proof of purchase or
the product serial number).
This warranty is in addition to your statutory rights as a consumer. If you are in
any doubt as to these rights, please contact your local Trading Standards
Department.
In the event of a claim please telephone ‘TechAssist’ customer support.
[phone]
You should obtain appropriate insurance cover for any loss or damage which
is not covered by Stuart Turner Ltd in this provision.
Please record here for your reference.
MODEL NO. SERIAL NO. DATE PURCHASED

DECLARATION OF CONFORMITY
Machinery Directive – 2006/42/EC
BS EN ISO 12100–1
Simple Pressure Vessel Directive – 2014/29/EU
IT IS HEREBY CERTIFIED THAT THE MAINSBOOST SYSTEM AS SERIAL NUMBER BELOW,
COMPLIES WITH THE ESSENTIAL REQUIREMENTS OF THE ABOVE E.E.C. DIRECTIVES.
RESPONSIBLE PERSON
AND MANUFACTURER STUART TURNER LIMITED
HENLEY-ON-THAMES, OXFORDSHIRE
RG9 2AD ENGLAND.
Signed .............................................Engineering Manager
Stuart Turner are an approved company to BS EN ISO 9001:2015
Stuart Turner Ltd, Henley-on-Thames, Oxfordshire RG9 2AD ENGLAND
Tel: [phone] Fax: [phone]
[e-mail] www.stuart-turner.co.uk
Issue No. 3620/03–01 Pt. No. 20531