Stuart Turner MAINSBOOST VariQ Guide

MAINSBOOST
VariQ
Installation, Operation & Maintenance
Instructions
Please leave this instruction booklet with the end user as it contains
important warranty, maintenance and safety information
Read this manual carefully before commencing installation.
This manual covers the following products:
Mainsboost
VariQ
Pt. No. 47322
CE c om pl i ant pr o duc t

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PRODUCT DESCRIPTION
Electric motor driven centrifugal pump complete with an automatic control system,
consisting of pressure transducer pressure vessel and electronic control.
APPLICATION
The Mainsboost VariQ is designed for pressure boosting applications in vented stored,
cold, clean water systems, where under gravity, no flow is available and can be used
in systems where either a positive or negative head exists. Inlet pressures to the pump
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
Important Facts - read before commencing installation ................................... 6
Location – General ................................................................................................... 7
Location – Cold Water Installation ............................................................................ 8
Location – Suction Lift Installation ........................................................................... 9
Pump Connections ..................................................................................................11
Electrical Installation .............................................................................................. 12
Commissioning ....................................................................................................... 14
Maintenance ........................................................................................................... 17
Technical Specification ..........................................................................................18
Trouble Shooting ................................................................................................... 20
Warranty ............................................................................................................... 23

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WARNINGS:
-This pump set must not be used for any other application without the
written consent of Stuart Turner 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.
-This product should not be used for the supply of water to more than
one dwelling (house, apartment, flat).
-Maximum head (closed valve) Stuart VariQ – 55 metres.
-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.
-RCD’s/ELCB’s are not recommended for use with variable speed
drives/motors. If an RCD is mandatory use type B RCD’s.
-For single phase sets with invertor motors the earth leakage circuit
breaker must trip out when an earth fault currents with DC content
(pulsating DC) occur.
-RCD’s suitable for use with variable speed drives/motors are not
suitable for personnel protection.
-Do not touch any electrical components for at least 5 minutes after the
unit has stopped to allow any discharge to occur safely.
-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.
-If the power cord is damaged, it must be replaced by an appropriately
qualified person in order to avoid a hazard.
-This appliance must be earthed via the supply cord.

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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 warranty.
CHECKLIST
IMPORTANT: With the pump removed from its packaging check for any damage prior to
installation. If any damage is found contact Stuart Turner Ltd within 24 hours of receipt.
Fig 1.
Typical installation configuration.
Short 22mm coper pipe
tails to connect between
isolating valve and flexible
pipes.
22mm copper outlet
pipework (discharge).
22mm isolating valve (non-
restrictive) and fittings
(not supplied) to allow
easy pump service.
22mm flexible hose.
These hoses are fitted
with G¾ female connector
suitable for connection to
a G1m to G¾ adaptor or
fitting.
B
A
C
B
D
22mm copper inlet
pipework (suction)

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Note: Item C, if purchased, is supplied loose and will require fitting to the pump
inlet/outlet. Tighten to torque 4/5 Nm. Your product may vary slightly from the picture
above.
ITEM
DESCRIPTION
QTY
A
Pump
1
B
Hose
2
Items B & C not
supplied but can
be purchased.
Part No. 29044
(UK) or 29045
(ROI).
C
Inlet /outlet connector &
gasket
2
D
In line filter
1
Not supplied but
recommended.

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IMPORTANT FACTS: READ BEFORE COMMENCING PUMP INSTALLATION
A Water storage capacity.
•The cold water storage capacity (must be a minimum of 230 litres) and 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 5 - Commissioning.
B Water temperature
•The water entering the pump must be controlled as follows:
•The minimum allowable water temperature is 4°C.
•The maximum allowable water temperature is 60°C.
C 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 warranty).
•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.
D 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.

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1 LOCATION - GENERAL
1.1. Access: For emergencies and maintenance the pump must be easily accessible.
1.2. Protection: The pump must be located in a dry position, frost free and
protected from freezing, particularly when installed in a loft (not
recommended). The pump must be protected from the elements.
1.3. Ventilation: Ensure an adequate air flow to cool the pump. Separate the pump
from other appliances that generate heat. An 80mm (3“) air gap must be
maintained around the pump.
1.4. Safety: The motor casing can become very hot under normal operating
conditions. Care must be taken to ensure it cannot be touched during
operation.
1.5. 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.
1.6. 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 (Ref
Fig. 2) does not exceed the max inlet head of 10 metres.
1.7. Ambient temperature: The pump must be sited in a location where the
maximum ambient temperature does not exceed 40°C.
1.8. Pipework: For optimum performance pipework use 22mm diameter.
1.9. Fixing: Ensure the pump is adequately secure when installed.
Note: Inlet pipework must always be greater than or equal to the outlet pipework
diameter. Pipework should only reduce to 15mm when entering terminal fitting.
When the length of the inlet pipe is more than 10 meters or the height of the inlet
pipe is greater than 4 meters, the diameter of the inlet pipe must be larger than the
diameter of the outlet.
1.10. Static outlet pressure: The static outlet head (Fig 2) must also be within the
maximum requirement of 12 metres.
1.11. Noise: Care must be taken when mounting the pump so that noise is not
amplified through loose panels or pipework.
1.12. Direction of flow: Ensure water enters the pump via the inlet on the front of the
pump and exit out the top.
1.13. Flexible hoses: Only use the Stuart Turner hose set that are available for the
pump.
1.14. Isolating valves: Separate system isolating valves (non-restrictive) must be
fitted to allow easy pump service.

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2. LOCATION - COLD WATER INSTALLATION
Fig 2.
Diagram showing typical cold water installation.
2.1. The cold water supply: Must be a DEDICATED AIR FREE supply via a tank
connector. Do not connect to the mains.
Static outlet pressure 12m max.
Static inlet pressure 10m max.

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Pump Mounted Above Liquid Source (Suction Lift Installation):
Fig 3.
Diagram showing typical pressure control installation with suction lift.
2.2. The pumps can be used in a suction lift installation providing the height of lift is
within the limits specified in the limits of application section and the liquid to be
pumped is cold water.
2.3. Before deciding where to locate the unit, check to ensure the static outlet head
does not exceed the maximum requirements 12 metres (Ref fig 3).
2.4. A footvalve and strainer may be used, and the suction pipework size must
match the pump. In order to prevent solid particles from entering the electric
pump, the inlet pipe must be equipped with a filter.
2.5. Lay the suction piping over the shortest possible distance and ensure there is a
constant rise from the liquid source to the pump. Any high spots will cause air
pockets to form, reducing system efficiency.
Max. static outlet pressure 12m
Max. suction lift 4m

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2.6. Ensure all joints in suction pipework are completely airtight. Failure to comply
will result in loss of prime.
2.7. The intake of the footvalve/strainer should be positioned such that it cannot be
blocked with debris or silt that are frequently found in the bottom of sumps and
wells.
2.8. When a footvalve is installed in the suction pipework, it is recommended that
suitable pressure relief valve be fitted in the discharge (outlet) pipework from
the pump.

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3. PUMP CONNECTIONS
3.1. Hose to pump: These pumps have G1 threaded connections. If flexible hoses are
used, the flexible hose end is made water tight with a sealing washer on
assembly, nip tight to 4/5 Nm for water tight seal (do not overtighten).
3.2. Hose to pipework: Hoses terminating in G1 threaded connections should be
sealed with PTFE tape or other suitable sealant.

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4. ELECTRICAL INSTALLATION / EARTHING
4.1. Regulations: The electrical installation must be carried out in accordance with
the current national electrical regulations and installed by a qualified person.
4.2. RCD’s/ELCB’s are not recommended for use with variable speed drives/motors.
If an RCD is mandatory use type B RCD’s.
4.3. For single phase sets with invertor motors the earth leakage circuit breaker must
trip out when an earth fault currents with DC content (pulsating DC) occur.
4.4. RCD’s suitable for use with variable speed drives/motors are not suitable for
personnel protection.
4.5. Do not touch any electrical components for at least 5 minutes after the unit has
stopped to allow any discharge to occur safely.
4.6. Before starting work on the electrical supply ensure power supply is isolated.
4.7. 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.
4.8. Adjacent pipes: Adjacent suction and delivery pipes should be fitted with
earthing clamps in accordance with current regulations (ref Fig 4).
Fig 4.
Diagram of earth continuity connections
4.9. Earthing: This appliance must be earthed via the supply cord.
4.10. Pipework: Copper or metallic pipework must have supplementary earth
bonding where the continuity has been broken by flexible hoses or plastic
components (not supplied).
4.11. 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.
4.12. Connections: The pump must be permanently connected to the fixed wiring of
the mains supply using the factory fitted supply cord, via a double pole
switched fused spur off the ring main and NOT connected to the boiler or the
immersion heater circuits.

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4.13. Wiring of connection unit:
WARNING: This appliance must be earthed.
The wires in the mains lead (supply cord) are coloured in accordance with the
following code:
-Green and Yellow: Earth
-Blue: Neutral
-Brown: Live
As the colours of the wires in the mains lead of this appliance may not correspond
with the coloured markings identifying the terminals in your connection unit
proceed as follows:
-The wire which is coloured green and yellow must be connected to the
terminal in the connection unit which is marked with the letter E or by the earth
symbol: or coloured green or green and yellow.
-The wire which is coloured blue must be connected to the terminal which is
marked with the letter N or coloured black.
-The wire which is coloured brown must be connected to the terminal which is
marked with the letter L or coloured red.
4.14. Fuses: The pump should be fitted with a 5A fuse.

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5. COMMISSIONING / SYSTEM FLUSHING / PRIMING / STARTING
5.1. System Flushing: The pipework system should be flushed out prior to the pump
being connected to ensure any contaminants / chemical residues and foreign
bodies are removed from elsewhere in the system.
5.2. Water Supply: Always ensure that water storage capacity is adequate to meet
the demand. Ensure the pump chamber is full of water before starting the
pump. Failure to do this could result in seal damage. To ensure dry running does
not occur the pump must be primed as described in priming section below. Do
not run pump dry. The volume ratio of solid impurities in the medium should not
exceed 0.1%, and the particle size should not exceed 0.2mm diameter.
5.3. Priming:
Never operate pump with inlet and/or outlet isolating valves in the closed position.
Damage will occur!
The pump must be primed (filled with water) before starting. Turn on the service
valves and vent/prime pump head.
a) Loosen priming plug and allow an even flow of water, this may take a few
seconds.
b) Re-seal draining plug, nipping tight. The pump is now ready to start.
Fig 5.
Mainboost VariQ.
Priming plug
Drain plug

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5.4. Starting:
a) Ensure all outlets are closed, turn power supply ‘on’ - pump will start, pressurise
the system then stop.
b) Open and close all outlets in turn associated with the pump, (including w/c
systems) allowing water to flow from each outlet until all air is purged. As each
outlet is opened and closed, the pump will start and stop respectively.
c) Note: After closing the outlet there will be a small time delay before the pump
stops, which is normal.
d) Any tap or control valve within the system when opened and closed will now
turn the pump on/off. Providing this is the case the system is now operating
correctly.
e) Carefully check pump and pipework for leaks whilst pump running and stationary
before leaving the installation unattended.
5.5. For further technical support: Phone the Stuart Turner TechAssist team on +44
(0) 800 31 969 80. Our staff are trained to help and advise you over the phone.
How to use the control panel:
a) Ensure the pump has mains power. The pump will power up 3 seconds after
mains power is introduced.
b) Press and hold start/stop key for 3 seconds to enter speed mode.
c) Select desired pressure using up or down arrows to change the ‘SET PRESSURE’
display to desired pressure.
d) Press and hold start/stop key again to stop pump operation.
e) Press and hold ‘Reset’ button for 3 seconds to reset pump to default pressure of
3.5 bar.

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Fig 6.
Control panel.
Indicator buttons:
a) Pump is ‘ON’
b) Leakage detected in pipeline: Check where possible for leaks or contact
appropriately qualified person.
c) Voltage protection: Input voltage has fallen out of specification for pump,
contact appropriately qualified person for correction.
d) Dry run detected: refer to section 8.11.
“OPERATING
PRESSURE” display
shows current
actual pressure the
pump is producing.
SET PRESSURE
display shows the
pressure the pump
is currently set at.
Pressure increase
button
Pressure decrease
button
Start/Stop button
Reset button
q
b
c
d

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6. MAINTENANCE
6.1. Disconnect electrical supply before working on the pump.
6.2. Turn off water supplies to the pump and release pressure by opening water
outlets before attempting maintenance.
6.3. Cleaners, Disinfectants and Descalents: Acid based descalents and aggressive
cleaning agents must not come into contact with the pump. The pump must be
removed from the system prior to the use of these products. The system should
be flushed to remove all chemicals before the pump is reconnected. If in any
doubt as to the suitability of the chemical solutions, please contact our
TechAssist helpline on [phone].
6.4. When the ambient temperature is lower than 4°C and the pump is not in use,
the pump chamber should be drained of water to protect internal components.

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7. TECHNICAL SPECIFICATION
Stuart Turner reserve the right to amend the specification in line with its policy of
continuous development of its products.
7.1. Noise: The equivalent continuous A-weighted sound pressure level at a distance
of 1 metre from the pump does not 66dB(A).
Physical Enclosure protection IPX4
Length: 391mm
Width: 194mm
Height: - excluding hoses 292mm
Weight: 9kg

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Pump Model
VariQ
General Warranty 2 years
Features
Pump type Centrifugal Multistage
Pump control Pressure/flow switch
Inlet strainer(s) Optional
Flexible hoses Optional
Dry run protection 
Priming vent plug 
Self priming 
Typical noise 66 dB(A)
Materials
Pump body Stainless steel
Impeller Plastic
Mechanical seal EDPM / Carbon / Ceramic
Performance
Maximum head - closed valve 55 metres
Performance @ 60 l/min 20.4 metres
Performance @ 80 l/min 10.2 metres
Maximum flow 97 l/min
Maximum static inlet pressure 10 metres
Maximum static outlet pressure 12 metres
Maximum working pressure* 650 kPa (6.5 bar)
Max. ambient air temperature (continuous) 40°C
Min / Max water temperature Min 4°C / Max 60°C
Max. suction lift* 4 metres
Connections Pump connections G1 female
Motor
Type Permanent magnet variable frequency
Duty rating Continuous (S1)
Electrical
Power supply (Vac/Ph/Hz) 230 V a.c. / 1 / 50 Hz
Power consumption - P1 665 Watts
Current- full load 2.9 Amps
Fuse rating 5 Amps
Power cable length 1.5 metres
Phy
#sical
Enclosure protection IPX4
Length 391 mm
Width 194 mm
Height - excluding hoses 292 mm
Weight - including fittings 9 Kg
*Note: A suction lift of up to 4 metres can be achieved if a footvalve and strainer is used.

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8. TROUBLE SHOOTING GUIDE
Symptoms Probable Cause Recommended Action
Pump will not start.
Electrical supply.
Check power supply.
Check fuse (see fuse section).
Check circuit breaker is set.
Check wiring connections.
Pump Jammed. Contact Stuart Turner.
Recommended static inlet/ outlet
heads exceeded.
Re-position pump (see pump
location section).
Control panel damaged. Contact Stuart Turner.
Insufficient water
pressure from pump.
Pressure setting incorrect.
Strainer clogged (if fitted).
Ensure pressure set on pump is
of required value.
Ensure the strainer is clear.
Inlet pipe work of insufficient
diameter.
Check dimension of pipe work.
Blockage in inlet pipe.
Ensure pipework is not blocked
or restricted.
No water being
discharged when
pump is running.
Pump is not primed with water.
Water supply failed.
Remove drain plug from bottom
of pump and ensure system is
filled with water.
Check water supply.
Pump check valve stuck. Contact Stuart Turner.
Pump drawing in air causing
cavitation when drawing water
from negative head situation.
Check for leaks on inlet pipes.
Provide pump with positive
head supply of water.
Pump runs on with
outlets closed.
Leak in system.
Check tap washers, w/c valve
washers, pipe joints.
Pump cycles (hunts)
on/off frequently.
Debris under non-return valve
sealing face.
Run at full flow to try and flush
away debris or remove, clean or
replace non-return valve.