gledhill Torrent Stainless OV User manual

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ONE NAME. EVERY SOLUTION.
TORRENT STAINLESS
OPEN VENTED STAINLESS STEEL
THERMAL STORE PROVIDING HEATING
AND MAINS PRESSURE HOT WATER
INSTRUCTION MANUAL
DESIGN, INSTALLATION & SERVICING

Page 2 Page 3
Section Page
DESIGN
Description 3
Technical Information 4
System Design 6
INSTALLATION
Installation 8
Wiring Diagrams 21
Commissioning 28
Installation Review 30
SERVICING AND MAINTENANCE
Servicing and Maintenance 31
Fault Finding 32
Short Parts List 39
APPENDIX
Appendix A 40
Appendix B 41
Notes 42
Terms & Conditions 44
BENCHMARK
Commissioning Check List 46
Service Record 47
ISSUE 4: APRIL 2018
These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.
Any installation must be in accordance with the relevant requirements of the Gas
Safety Regulations, Building Regulations, I.E.E. Wiring Regulations and the Water
Fitting Regulations (England and Wales) or Water Byelaws (Scotland). It should be
read in accordance with the relevant recommendations of the following:
BS 6798; BS 5549; BS 5546;
BS 5440:1; BS 5440:2; CP 331:3
BS 6700: BS 5258 and BS 7593: 1993 and BS7671
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
This product overcomes Part G Building Regulation discharge requirements for
unvented cylinders but the installation is notiable to building control unless it is
carried out under an approved competent person self-certication scheme.
Although the secondary supply (domestic) is at mains pressure, it is not necessary to
t an expansion chamber, pressure or temperature relief valve, the plumbing should
allow any unusual build up of pressure to be relieved at the ball valve.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
PLEASE NOTE: THAT WE DO NOT THEREFORE ACCEPT ANY RESPONSIBILITY FOR
MATTERS OF DESIGN SELECTION OR SPECIFICATION, FOR THE EFFECTIVENESS
OF AN INSTALLATION OR SYSTEM CONTAINING ONE OF OUR PRODUCTS UNLESS
SPECIFICALLY REQUESTED TO DO SO IN WRITING.
All goods are sold subject to our Conditions of Sale which are set out at the rear of this
specication. In the interest of continuously improving the Torrent Stainless range,
Gledhill Building Products Limited reserve the right to modify the product without notice,
and in these circumstances this booklet, which is accurate at the time of printing, should
be disregarded. An updated set of Instructions will be produced and supplied with new
appliances and will be made available for other appliances on request.
Benchmark places responsibilities on both manufacturers and installers. The
purpose is to ensure that customers are provided with the correct equipment for
their needs, that it is installed, commissioned and serviced in accordance with the
manufacturers instructions by competent persons and that it meets the requirements
of the appropriate Building Regulations. The Benchmark Checklist can be used to
demonstrate compliance with Building Regulations and should be provided to the
customer for future reference.
Installers are required to carry out installation, commissioning and servicing work
in accordance with the Benchmark Code of Practice which is available from the
Heating and Hot Water Industry Council who manage and promote the Scheme. Visit
www.centralheating.co.uk for more information.
For information on the HWA Charter Statement, go to the HWA website hotwater.org.uk.
Manufacturer: Gledhill Building Products Ltd
Max. mains inlet water pressure 5.0bar
Max. working pressure - Primary heat exchanger (Indirect models) 3.0bar
Max. working pressure - Solar heat exchanger (Solar models) 6.0bar
Max. working pressure - Open vented thermal store (All models) 10.0m (1.0bar)
Max. working pressure - Open vented central heating system 10.0m (1.0bar)
Max. working pressure - Sealed heating system 3.0bar
Max. ow rate - Measured by ow sensor 32 l/min
Min. ow rate - Measured by ow sensor 1.8 l/min
Immersion heater rating
3kW@230Vac,50Hz
The Torrent Stainless comes complete with plate heat exchanger.This has a very
small volume of water held within it, therefore any minimal expansion will be
accomodated in the supply pipe.
Handling Before Installation
The Torrent Stainless must be handled with care and stored the correct way up in
a dry place. Any manual handling/lifting operations will need to comply with the
requirements of the Manual Handling Operations Regulations issued by the H.S.E.The
appliance can be moved using a sack truck on the rear face although care should be
taken and the route should be even. In apartment buildings containing a number of
storeys we would recommend that the appliances are moved vertically in a mechanical
lift. If it is proposed to use a crane, expert advice should be obtained regarding the
need for slings, lifting beams etc. A specic manual handling assessment is shown in
Appendix B at the rear of this manual.
Maintenance
Modications should not be made to this product. Replacement parts, including
immersion heaters, should be purchased from Gledhill Building Products Limited, or
agents approved by them.The manual must always be left with the Torrent Stainless.
The Environment
This product has been manufactured using many recyclable materials, including the
approved HCFC/CFC free polyurethane foam insulation. At the end of its useful life, it
should be disposed of at a Local Authority Recycling Centre, to maximise the products
full environmental benets.
Note:
The thermal store is supplied with either one or two immersion heaters. These
incorporate a thermostat (XB081) which cuts the electricity supply to the immersion
heater if the control thermostat fails - a thermal cut out. Under no circumstances t
an immersion heater which does not incorporate a thermal cut out.
Why use a thermal store?
a) Alternative energy fuel sources are typically low grade, inherently unpredictable
and are often available in plentiful supply but not when the heat energy is
needed! A thermal store provides the means to harness the energy when it is
available for later conversion into both hot water AND heating.
Being open vented, they provide a simple and inherently safe way to produce
high-performance mains pressure hot water.
Multiple heat sources feed into the thermal store. This means that the energy
available from solar panels or a wood burning stove, for example, can be used
to provide energy into the heating circuit to decrease the use of fossil fuel based
boilers, and hence reduce household running costs.
DESIGN
DESCRIPTION
It is very problematic and inherently unsafe
to connect wood burning stoves or other
uncontrolled heat sources to an unvented
cylinder, and not easily possible to combine
alternative energy heat sources to provide
energy to the heating circuit, hence the
unique advantages of a thermal store.
b) The Torrent Stainless is the ideal product
to use as the heart of an alternative energy
system as it will take energy input not only
from a conventional boiler but also from a
wide variety of alternative energy sources,
including but not limited to:
• solar panels
• wood burning stoves and other
uncontrolled heat sources
• electricity from renewable or low
carbon sources
If the system is congured appropriately
the heat from the alternative energy source
will be available for both hot water AND
heating.
c) The Torrent Stainless becomes the neutral
point in any open vented system because
the open vent and cold feed pipes are
connected to it. The benet of this is that
another device to enable dierent systems
to be joined together at a neutral point is
not required, which would be required in
other systems. In multiple fuel systems, the
Torrent Stainless acts as a low loss header.
d) Alternative energy supplies cannot be relied
upon to raise the temperature of the stored
water above 60 degrees every time they
operate. This is not a problem with a thermal
store because the store water is not the
water that comes out of the tap. The water
that comes out the hot tap is mains cold
water run through a plate heat exchanger
on the outside of the thermal store. This
water heats very quickly and the volume of
stagnent water in the heat exchanger is very
small so there is virtually no legionella risk.
e) The thermal store is open vented and
therefore does not require additional safety
devices such as temperature and pressure
relief valves or an inlet control group and
expansion vessels.
f) The running costs of this cylinder are greatly
reduced by not being required to have
an annual safety inspection where as an
unvented cylinder does.

Page 4 Page 5
Technical
Model
Energy Eciency Class
Heat Loss
Domestic Hot Water Volume
Weight - Empty
Weight - Full
Overall Height
(Excluding F&E Tank)
Overall Diameter
(Allow additional 150mm for PHE)
Cold Feed
Sealed Primary
Boiler Coil Flow
Sealed Primary
Boiler Coil Return
Solar Coil Flow
Solar Coil Return
Central Heating Flow
Central Heating Return
Cylinder Drain
Solid Fuel Flow
Solid Fuel Return
Open Vented
Boiler Flow
Open Vented
Boiler Return
Open Vent
Surface Area of
Primary Heater Coil
Surface Area of
Solar Heater Coil
Capacity (Total Volume)
Dedicated Solar Volume
Maximum Hot Water
Flow Rate
watts litres kg kg A
mm mm B mm
C
mm
D
mm
E
mm
F
mm
G
mm
H
mm
I
mm
J
mm
K
mm
L
mm
M
mm
N
mm m2m2litres litres litres/min
Torrent Stainless
OV
TST150OV B 47 141 32 180 1118 550 285 n/a n/a n/a n/a 614 220 220 614 223 651 220 1177 n/a n/a 148 n/a 26.5
TST180OV B 55 169 36 214 1306 550 285 n/a n/a n/a n/a 665 220 220 665 223 732 220 1365 n/a n/a 178 n/a 26.5
TST210OV B 62 198 39 247 1494 550 285 n/a n/a n/a n/a 710 220 220 710 223 828 220 1553 n/a n/a 208 n/a 26.5
TST250OV C 74 236 44 292 1744 550 285 n/a n/a n/a n/a 783 220 220 783 223 939 223 1803 n/a n/a 248 n/a 26.5
TST350OV C 79 328 54 399 1765 630 285 n/a n/a n/a n/a 690 218 218 690 221 896 221 1826 n/a n/a 345 n/a 26.5
Torrent Stainless
OV SOL
TST150OVSOL B 47 141 34 182 1118 550 285 n/a n/a 405 235 838 427 220 838 430 804 504 1177 n/a 0.78 148 63.9 26.5
TST180OVSOL B 55 169 38 216 1306 550 285 n/a n/a 405 235 838 427 220 838 430 804 504 1365 n/a 0.78 178 73.8 26.5
TST210OVSOL B 62 198 42 250 1494 550 285 n/a n/a 515 235 1015 537 220 1015 540 1071 611 1553 n/a 1.27 208 83.7 26.5
TST250OVSOL C 74 236 47 295 1744 550 285 n/a n/a 515 235 1040 537 220 1040 540 1441 761 1803 n/a 1.27 248 96.9 26.5
TST350OVSOL C 79 328 57 402 1765 630 285 n/a n/a 498 218 971 520 218 971 523 1446 676 1826 n/a 1.27 345 129.9 26.5
Torrent Stainless
SP SOL
TST150SPSOL B 47 141 36 184 1118 550 285 804 504 405 235 838 427 220 838 430 n/a n/a 1177 0.78 0.78 148 63.9 26.5
TST180SPSOL B 55 169 41 219 1306 550 285 804 504 405 235 838 427 220 838 430 n/a n/a 1365 1.27 0.78 178 73.8 26.5
TST210SPSOL B 62 198 45 253 1494 550 285 1071 611 515 235 1015 537 220 1015 540 n/a n/a 1553 1.27 1.27 208 83.7 26.5
TST250SPSOL C 74 236 51 299 1744 550 285 1441 761 515 235 1040 537 220 1040 540 n/a n/a 1803 1.40 1.27 248 96.9 26.5
TST350SPSOL C 79 328 63 408 1765 630 285 1446 676 498 218 971 520 218 971 523 n/a n/a 1826 2.50 1.27 345 129.9 26.5
DESIGN DESIGN
TECHNICAL INFORMATION TECHNICAL INFORMATION
Torrent Stainless SP SOL
G
D
H
J
K
C
B
E
I
F
A
N
Torrent Stainless OV SOL
G
M
H
J
K
L
B
E
I
F
A
N
Torrent Stainless OV
L
G
J
K
B
H
I
M
A
N
NOTES
1. The diagrams shown are generic. For exact
product specication refer to the table eg.
the number of immersion heaters varies
depending on model.
2. All connections are within 120˚.
3. Thedomestichotwatervolumeshownis
basedononeheat up,andthestore is
fully charged to 75°C.
4. Domestic hot water volume shown in
solar cylinders will reduce where the solar
input reduced or unavailable (potentially up
to 40%).
If more detail is required, please contact our
technical desk on 01253 474584

Page 6 Page 7
Torrent Stainless OV
Available Components and Tappings
1. Open Vent - 22mm Compression
2. Cold Feed (F&E tank) - 22mm Compression
3. On-Peak Immersion Heater - 1 3/4”Female
4. O-Peak Immersion Heater - 1 3/4” Female
5. Control Thermostat Pocket - 22mm Dual
Pocket
6. Control Thermostat - 22mm Dual Pocket
7. Control Thermostat Pocket- 22mm Dual
Pocket
8. Central Heating Flow - 22mm Compression
9. Central Heating Return - 22mm Compression
10. Cylinder Drain - 1/2”Female
11. PHE Flow - 22mm Plain Pipe
12. PHE Return - 22mm Plain Pipe
13. DHW Store Sensor - 10mm Single Pocket
14. Open Vented Flow - 22mm Compression
15. Open Vented Return - 22mm Compression
16. Solid Fuel Flow - 28mm Compression
17. Solid Fuel Return - 28mm Compression
18. Solid Fuel Overheat Stat - 22mm Dual Pocket
19. Solid Fuel ControlThermostat - 22mm Dual
Pocket
20. Hot water supply - 22mm Compression
21. Mains cold water supply - 22mm Comp.
Torrent Stainless OV SOL
Available Components and Tappings
1. Open Vent - 22mm Compression
2. Cold Feed (F&E tank) - 22mm Compression
3. Immersion Heater - 1 3/4” Female
4. Solar Coil Flow - 22mm Compression
5. Solar Coil Return - 22mm Compression
6. Control Thermostat Pocket - 22mm Dual
Pocket
7. Control Thermostat - 22mm Dual Pocket
8. Solar Sensor Pocket - 22mm Dual Pocket
9. Solar Sensor Pocket - 22mm Dual Pocket
10. Central Heating Flow - 22mm Compression
11. Central Heating Return - 22mm Compression
12. Cylinder Drain - 1/2”Female
13. PHE Flow - 22mm Plain Pipe
14. PHE Return - 22mm Plain Pipe
15. DHW Store Sensor - 10mm Single Pocket
16. Open Vented Flow - 22mm Compression
17. Open Vented Return - 22mm Compression
18. Solid Fuel Flow - 28mm Compression
19. Solid Fuel Return - 28mm Compression
20. Solid Fuel Overheat Stat - 22mm Dual Pocket
21. Solid Fuel ControlThermostat - 22mm Dual
Pocket
22. Hot water supply - 22mm Compression
23. Mains cold water supply - 22mm Comp.
Torrent Stainless SP SOL
Available Components and Tappings
1. Open Vent - 22mm Compression
2. Cold Feed (F&E tank) - 22mm Compression
3. Immersion Heater - 1 3/4” Female
4. Solar Coil Flow - 22mm Compression
5. Solar Coil Return - 22mm Compression
6. Control Thermostat Pocket - 22mm Dual
Pocket
7. Control Thermostat - 22mm Dual Pocket
8. Solar Sensor Pocket - 22mm Dual Pocket
9. Solar Sensor Pocket - 22mm Dual Pocket
10. Central Heating Flow - 22mm Compression
11. Central HeatingReturn - 22mm Compression
12. Cylinder Drain - 1/2”Female
13. PHE Flow - 22mm Plain Pipe
14. PHE Return - 22mm Plain Pipe
15. DHW Store Sensor - 10mm Single Pocket
16. Primary Coil Flow - 22mm Compression
17. Primary Coil Return - 22mm Compression
18. Solid Fuel Flow - 28mm Compression
19. Solid Fuel Return - 28mm Compression
20. Solid Fuel Overheat Stat - 22mm Dual
Pocket
21. Solid Fuel Control Thermostat - 22mm Dual
Pocket
22. Hot water supply - 22mm Compression
23. Mains cold water supply - 22mm Comp.
10
8
16
14
18
19
4
7 1215179
1
2
3
5
11
13
6
20
21
4
12
20
21
11
10
18
19
17
9 145
1
2
3
6
8
16
13
15
7
22
23
4
12
20
21
11
10
18
19
17
9 145
1
2
3
6
8
16
13
15
7
22
23
DESIGN DESIGN
SYSTEM DESIGN SYSTEM DESIGN
The cold feed to the cylinder is taken from the F&E tank (connection 2 shown
above). The mains cold water supply is connected to the pipework leading to the
plate heat exchanger (connection 23 shown above).
The feed and expansion tank for the Torrent Stainless must be sized to take the
water expansion of the whole system (i.e. solid fuel boiler, open vented boiler and
auxiliary heating).
Specify optional components at time of order with any of the Torrent Stainless
models
A. Header tank
B. Ball valve
C. Float
D. Overheat thermostat
E. Scale inhibitor (tted to the control panel)
See page 39 for part reference codes.
2
23

Page 8 Page 9
Model Selection
The suggested model sizes shown in the tables
opposite are based on a typical daily hot water
usage and on the assumptions that the heating
system is correctly sized and that the thermal
store is fully charged to at least 75°C by the main
heat source.
When selecting a solar model, it is important
to check the dedicated solar volume (shown in
table on pages 4-5) complies with the Building
Regulations ADL1 Domestic Building Services
Compliance Guide.
The suggested model sizes are based on
typical hot water usage. For high specication
dwellings an increase of one model size should
be considered.
Please see page 18 for pipework conguration
where Torrent Stainless SP SOL is selected and
both coils are to be used with a boiler.
General Design Considerations
As a general rule, the cupboard footprint needs
to be a minimum of 150mm wider, 80mm
deeper and 80mm taller than the unit selected.
to accommodate the plate heat exchanger and
associated pipework.
The base chosen for theTorrent Stainless should
be level and capable of supporting the weight of
the unit when full of water as shown in General
Data.
General Restrictions
a. Bidets incorporating an ascending spray
inlet, or using a exible hose or arranged
with a spray or jet are a uid category 5 risk.
These should not be used with the Torrent
Stainless when it is also serving other outlets.
b. Torrent Stainless should not be used where
steam is the primary heating medium.
The gures above are to be used where there is only a sealed system boiler connected,
and both boiler and solar coils are connected to the boiler.
Torrent Stainless OV Model Selection Guide
Max hot water demand Bedrooms Model
1 bathroom 1 - 2 TST150OV
1 bathroom + en-suite shower 2 - 3 TST180OV
2 bathrooms + en-suite shower 2 - 3 TST210OV
2 bathrooms + 2 en-suite showers 3 - 4 TST250OV
3 bathrooms + 2 en-suite showers 4 - 5 TST350OV
Torrent Stainless SP SOL Model Selection Guide (Boiler Only)
Max hot water demand Bedrooms Model
1 bathroom 1 - 2 TST150SPSOL
1 bathroom + en-suite shower 2 - 3 TST180SPSOL
2 bathrooms + en-suite shower 2 - 3 TST210SPSOL
2 bathrooms + 2 en-suite showers 3 - 4 TST250SPSOL
3 bathrooms + 2 en-suite showers 4 - 5 TST350SPSOL
Mains Water Supply
A typical arrangement of the hot and cold water system is shown below. The PHE on all
Torrent Stainless models are designed to be fed directly from the mains water supply
and they full the requirements of WRAS Schedule 2 (paragraph 15.2), and therefore
do not require a check valve to be tted to the cold water supply pipe.
The performance of the Torrent Stainless is directly related to the cold water supply
pressure and volume to the dwelling. This must be capable of providing for all those
services which could be required simultaneously and the maximum demand should
be calculated for sizing the distribution network.
As a general guideline, although a 15mm external service may be sucient for the
smaller dwelling with one bathroom, a 22mm service is preferred (25mm MDPE) and
should be the minimum for larger dwellings.
The Torrent Stainless will operate at dynamic pressure as low as 1.5 bar (at the
appliance) which must be available when the local demand is at its maximum, but
the preferred range is between 2 and 3.0 bar.
If the incoming static mains pressure exceeds 5.0 bar at any point in the 24 hour cycle,
then a pressure limiting valve set at 3.0 bar should be tted downstream of the stop
tap where the cold supply enters the dwelling.
If a water meter is tted in the service pipe, it should have nominal rating to match
the anticipated maximum simultaneous hot and coldwater demand, calculated in
accordance with BS EN 8558:2011. This could be up to 50 l/min in some properties.
The sanitary water equipment used in the system should be suitable for a working
pressure of 10 bar and the units must be fitted strictly in accordance with the
requirements of the Water Supply (Water Fittings) Regulations 1999.
Torrent Stainless SP SOL Model Selection Guide
Max hot water demand
Max solar
collector
area (m2)
Bedrooms Model
1 bathroom 2.22 1 - 2 TST150SPSOL
1 bathroom 2.54 2 - 3 TST180SPSOL
1 bathroom + en-suite shower 2.91 2 - 3 TST210SPSOL
2 bathrooms + en-suite shower 3.88 3 - 4 TST250SPSOL
2 bathrooms + 2 en-suite showers 4.64 4 - 5 TST350SPSOL
Torrent Stainless OV SOL Model Selection Guide
Max hot water demand
Max solar
collector
area (m2)
Bedrooms Model
1 bathroom 2.22 1 - 2 TST150OVSOL
1 bathroom 2.54 2 - 3 TST180OVSOL
1 bathroom + en-suite shower 2.91 2 - 3 TST210OVSOL
2 bathrooms + en-suite shower 3.88 3 - 4 TST250OVSOL
2 bathrooms + 2 en-suite showers 4.64 4 - 5 TST350OVSOL
INSTALLATION INSTALLATION
INSTALLATION INSTALLATION
TYPICAL HOT AND COLD DISTRIBUTION
Check valve NOT REQUIRED unless
supply pipe services more than one dwelling
Check valve NOT REQUIRED unless scale inhibitor is a chemical type.
In any event,do not fit a check valve down stream of this point (see 5.1.9)
Pressure limiting valve
(Not required unless mains pressure is greater than 5 bar)
Supply
pipe
Second dwelling Sink
Scale inhibitor
(where necessary)
Bath
H.B.
W.C.
BS1212
Ballvalve
Hot and Cold Distribution Pipe Arrangement - All Models
Taps and Shower Fittings
Aerated taps are recommended to prevent
splashing.
All types of shower mixing valves can be used
as long as both hot and cold supplies are mains
fed. However all mains pressure systems are
subject to dynamic changes particularly when
other hot and cold taps/showers are opened
and closed, which will cause changes in the
water temperature at the mixed water outlet
such as showers. For this reason and because
thermostatic showers are now no more
expensive than manual showers, we strongly
recommend thermostatic showers withTorrent
Stainless. The shower head provided must also
be suitable for mains pressure supplies.
The hot water supply to a shower-mixing valve
should be fed where practical directly from the
Torrent Stainless or be the rst draw-o point
on the hot circuit. The cold water supply to a
shower-mixing valve should where practical
be fed directly from the rising mains via an
independent branch.
The shower must incorporate or be tted with the
necessary check valves to prevent back-syphonage
protection in accordance withWater Regulations.
Bidets in domestic locations of the over rim
style, that have no ascending spray or spray
and/or exible hose may be supplied by the
Torrent Stainless, providing that a type AUK2
air gap is maintained between the outlet of the
water tting and the spill over level of the bidet.

Page 10 Page 11
from any heating from the hot water pipework
to ensure that the water remains cold and of
drinking water quality.
A pipe thermostat is incorporated in the circuitry
which cuts the supply to the pump when
the water in the return pipe reaches the set
temperature. Ensure the hot water temperature
is set correctly to avoid excessively hot water at
the outlets and long pump run times.
Secondary circulation pipework must be
insulated to prevent energy loss in both heated
and unheated areas.
Immersion Heaters
These are 3kW 230V AC heaters and incorporate
a thermostat. The thermostat incorporates a
manual reset. They have incalloy elements
to prolong their life expectancy in aggressive
water conditions. We recommend best practice
of connecting the wiring to the immersion heater
is using crimp connections.
Utilising O Peak Electricity
Where it is intended that units are fitted to
unrestricted offpeak circuits, then suitable
controllers such as the Horstmann o peak electric
time controller will be required. External wiring
to the immersion heaters must be in accordance
with the relevant IEE Wiring Regulations and the
circuit must be protected by a suitable 16A MCB
fuse and a 20A double pole isolating switch.
Safety
The immersion heaters must be earthed and they
must be isolated from the mains before the cover
is removed on every occasion. Replacement
immersion heaters should be obtained from
Gledhill Building Products Limited.
Important
The unit must not be powered up unless the
thermal store has been lled with water, the
pump has been bled and water is conrmed
to be present in the pipework above the pump.
Wiring The Control Panel
The control panel requires a separate 3 amp fuse spur double pole to ensure safe
isolation. The cable/ex from the fuse spur to the control panel must be a minimum
of 0.75mm2C.S.A. and be heat resistant. The cable should be clipped to prevent
accidental snagging.
The control panel front cover is secured by 4 screws. Remove these and lift o the
front cover to expose the power terminals. These are found at the bottom left of the
control panel. Prepare the cable end and feed it through the cable gland.
Use a screwdriver to press the neutral cross down on the WAGO connector.This opens
the clamp and the neutral wire can be fed into the connector. Remove the screwdriver
and test the wire is securely t. Repeat with the PE and live cables.Tighten the cable
gland and check for security. Perform the necessary safety checks and ret the front
panel.
Secondary Hot Water Circulation
If the length of the hot water draw-o pipework is excessive and the delivery time
will be more than 60 seconds before hot water is available at the tap, you may wish to
consider using trace heating to the hot water pipework such as the Raychem HWAT
system. Also a conventional pumped secondary circulation system (shown below)
can be used with any model of the Torrent Stainless.
It is important that the cold water pipework is adequately separated and protected
Pipe Layout
In all mains pressure installations it is important to remember that the incoming cold
supply must be shared between all terminal ttings. It is important that a 22mm supply
is brought to the appliance and a 22mm take-o is continued at least to the bath.
If there are two baths, 28mm pipework should be considered. One metre of smaller
diameter pipework, or ow restrictors, should be provided on the nal connection to
all outlets so as to balance the water available. In any event the distribution pipework
should generally be in accordance with BS EN 806:3.
Plastic Pipework
All the recommendations with regard to the heating systems in this manual are
generally based on BS/EN Standards copper pipework and ttings. However plastic
pipework system can be used in place of copper as long as:-
a. The chosen system is recommended for use in domestic heating systems by the
manufacturers and it is installed fully in accordance with their recommendations.
b. The design criterion of the plastic system is at least equivalent to the use of BS/EN
Standards copper pipework and ttings.
c. Barrier pipework for these systems is recommended.
Ball Valve and Overow
The feed and expansion tank can be lled manually if required e.g. using a hose pipe
tted with a double check valve.
In this situation an overow pipe can still be tted if required to ensure that if a leak occurs
on the plate heat exchanger it can be discharged safely to the outside of the building.
Note: If a ball valve is tted, then a warning/overow pipe must always be tted.
The feed and expansion tank (provided by the installer) must be sized correctly to
enable the expansion of the entire system volume.This will include the central heating,
store, solid fuel and boiler circuit volumes.
See page 12 for guidance sizing the feed and expansion tank.
Water Treatment
In all Torrent Stainless models, the primary (i.e. non-potable) water is stored and the
domestic hot water is heated instantaneously by means of heat exchangers. Therefore
treating the primary water will not contaminate the domestic hot water supply.
Although the Torrent Stainless primary store has no special water treatment
requirements, the radiators and other parts of the circuit will require the application of
a scale and corrosion inhibitor. The only Fernox products that arent compatible are the
Flux and to a lesser extent some of our Acidic Cleaning products, namely DS40. This is
because the Chloride in Flux can cause pitting in even Duplex Steel. The volumes and
concentration should be calculated in accordance with the manufacturers instructions
and when calculating the system volume (i.e. the water content), the volume of the
Torrent Stainless should be taken into account.
Use In Hard Water Areas And Scale Protection
The patented design of the domestic hot water plate heat exchanger is such that
the turbulence through the plates slows down the formation of scale in moderate
hard water conditions. However, the requirements set out in the ‘Domestic Building
Services Compliance Guide’ and the Building Regulations approved documents L1A
and L1B regarding scale protection should be complied with.
INSTALLATION INSTALLATION
INSTALLATION INSTALLATION
Thermostat
Immersion Heater Wiring
E
L
N
These requirements state that; “where the mains
water hardness exceeds 200ppm provision should
be made to treat the feed water to the water
heaters and the hot water circuit of combination
boilers to reduce the rate of accumulation of
scale”. To comply with this requirement: -
a. The hardness of the mains water should be
checked by the installer and if necessary a
suitable in-line scale inhibitor device should
specied for hardness levels between 200
and 300ppm (mg/l).
b. Where the hardness level is 300ppm (mg/l) and
above, the optional phosphate type inhibitor
should be specied and tted at a suitable
point in the cold water supply to the appliance.
It is important that where the supply to the
Torrent Stainless is in 22mm the in-line scale
inhibitor is also 22mm. In practice servicing is not
normally required but in hard water areas, the
requirements can be considered similar to those
needed for instantaneous or ‘combi’ appliances.
The installation of scale inhibitor should be in
accordance with the manufacturers instructions
and Water Byelaws.
London Loop
As the thermal store gets hot the water will
expand and the water level in the F&E tank will
rise, as will the level of water in the vent pipe.
Hot water will also rise to the top of the cylinder.
When the water at the base of the cylinder
becomes hotter it may run out the cold feed
connection pipe. If the cold feed pipe then runs
vertically it works like a chimney with the hot
water rising to the top in the same way hot air
does from a re. If this section is not insulated
then it will lose heat and waste energy.
If,however, the coldfeed is formed intoa sheppard’s
crook or london loop it will form a thermal trap. A
thermal trap works by ensuring that cold water is
held below hot water. Because hot water always
rises it will not be able to move down and around
the loop/crook and therefore will not rise up the
cold feed pipe work. This will reduce heat loss and
thereby prevent energy waste.
The minimum depth of the U trap is calculated by
multiplying the pipe diameter by 8. For example;
• Using 22mm pipework will require a
minimum of 176mm
22mm pipework is highly recommended to
ensure that the London loop does not air lock
during the commissioning process. It also
enables a faster installation of the product due
to the increased lling rate.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
1
2
3
4
1
2
3
4
5678
1
2
1
2
3
4
5
6
7
8
9
1
10
2 3
4 5 6
J18
J20
J19
J3 J7
J8
J1 TS sensor
GND GND
IN OUT
T1 T2
1
2
CW sensor
1
2
Combined flow
and
HW temperature
sensor
L - Brown
PR61
E –G/Y
N - Blue
PWM -
PWM
+
SPARE
Fuse
Dip
Switch 1 2 3 4
To
DHW
pipe
All the these sensor inputs carry a
Voltage of 5V.
The max cable length is 1 meter.
The sensors connected to the control
Should be free from the appliance earth
Torrent Stainless
Inline lter &
ow regulator
Single check
valve
Single
check
valve
Pump isolation
valves
Cold water inlet
Plate heat exchanger
Hot water outlets Pipework length and
diameter to suit
property demands
Pipework length and
diameter to suit
recirculation ow rate
approx 1-2 l/min
Cold water sensor
Control
stat
Flow sensor
Potable water
expansion vessel
Secondary
circulation
pump

Page 12 Page 13
INSTALLATION INSTALLATION
INSTALLATION TORRENT STAINLESS OV
Boiler Size
The minimum total boiler power required is the
sum of the power required for space heating
which should be calculated in accordance with
BS EN 12831 and/or the CIBSE guide and the
power required for producing hot water which
can be read from the table to the left.
The coil performance gures are based on a
boiler ow temperature of 82°C and ow rate
of 0.25 litres per second.The boiler needs to be
able to modulate down to the 7°C temperature
dierence setting to maximise eciency.
Please see page 18 for pipework conguration
where Torrent Stainless SP SOL is selected and
both coils are to be used with a boiler.
Expansion Vessel For Sealed Heating System
The table opposite can be used for sizing the
heating system expansion vessel. The water
content of the Torrent Stainless primary heat
exchanger is listed in specication tables on
pages 4 and 5 and a gure of 4.5 l/kW of installed
radiator capacity can be used for a preliminary
assessment of the water content of the heating
system.
The expansion vessel requirements shown in
the table are based on a maximum boiler ow
temperature of 93°C. The expansion vessel
must be suitable to accommodate the change
in volume of water in the heating system when
heated from 10°C to 100°C, with a maximum
operating temperature of 99°C.
Feed And Expansion Tank For Open Vented
Heating System
The table opposite shows the recommended
size and number of F & E tanks required for an
open vented hot water only system, which can
be supplied as an optional extra.
Expansion for the open vented heating systems
connected to the store must be added to this
gure. So, as a preliminary assessment of the
water content of the attached open vented
systems, a gure of 4.5 l/kW of radiator output
can be used. For example, 20 kW radiator output
would have a system volume of 90 litres, and
potential expansion of this would be 3.6 litres,
and 10 kW would be 45 litres total volume and
1.8 litres for expansion.
Please refer to page 19 for further information
regarding F&E tanks when using solid fuel input.
Allowance for domestic hot water for sizing the boiler
Torrent Stainless model Allowance for domestic hot water heating (kW)
Full divert mode Flow share mode
150 0 2
180 0 3
210 0 4
250 0 5
350 0 7
Open vented heating systems
The open vented primary system is lled via the
feed and expansion (F&E) tank tted with the
Torrent Stainless OV model and therefore it is
important that the F&E tank is positioned at least
250mm above the highest point in the system.
Please check the F&E tank is big enough for the
whole system expansion. Also ensure that the
height of the F&E tank is sucient to meet the
manufacturer’s requirements for the minimum
head required for the boiler and the system
pump(s).
The Torrent Stainless OV models can be installed
using both ‘Y’ Plan and ‘S’ Plan heating system
controls. These models can also be installed
without either 3-port or 2-port valves using
a separate central heating pump as shown in
diagrams on this page. In this case no bypass valve
is required unless TRV’s are used on all radiators.
If the ow and return pipes between the boiler
and the Torrent Stainless OV thermal store are
dipped as illustrated in the schematic shown
opposite, then the boiler selected must be
suitable for a sealed heating system i.e. it must be
tted with an overheat thermostat. Automatic
air vents should be tted at appropriate places
to vent the system and a pressure relief valve
should also be tted close to the boiler.
Any boiler can be used with theTorrent Stainless
OV and the Torrent Stainless SOL provided the
ow pipe from the boiler to theTorrent Stainless
is continuously rising. The ow pipe between
the boiler and the Torrent Stainless thermal
store is part of the open vent and therefore it
must not be tted with any isolating valve, non-
return valve or any other component which can
obstruct the ow.
The minimum size of flow and return pipe
between the boiler and the Torrent Stainless
should be 22mm copper or equivalent. In any
case it should be sized to suit the installed boiler
capacity, available pump head and the circuit
resistance.
The water level must be set correctly by adjusting
the ball valve in the F&E tank. The overow/
warning pipe, should be no less than the 20mm
internal diameter and have a continuous fall.
The overow/warning pipe should be tted to
discharge clear of the building and be sited so
that any overow can be easily observed. The
warning pipe should be installed in either high
temperature uPVC or copper and should not
have any other connections to it.
If the boiler does not incorporate an overheat
thermostat, then one should be tted to the store.
Sealed Heating System Expansion Vessel Requirements
Safety valve setting 3.0
Vessel charge
pressure (bar) 0.5 1.0 1.5
Initial system charge
pressure (bar) 0.5 1.0 1.5 2.0 1.0 1.5 2.0 1.5 2.0
Total System
Volume (litres) Expansion Vessel Volume (litres)
25 2.1 3.5 6.5 13.7 2.7 4.7 10.3 3.9 8.3
50 4.2 7.0 12.9 27.5 5.4 9.5 20.6 7.8 16.5
75 6.3 10.5 19.4 41.3 8.2 14.2 30.9 11.7 24.8
100 8.4 14.0 25.9 55.1 10.9 19.0 41.2 15.6 33.1
125 10.4 17.5 32.4 68.3 13.6 23.7 51.5 19.5 41.3
150 12.5 21.0 38.8 82.6 16.3 28.5 61.8 23.4 49.6
Thermal Store Minimum Number of Feed and Expansion Tanks
(16 litre model inc. 10 litre expansion)
TST150, TST180, TST210 1
TST250, TST350 2
Expansion of all connected open vented systems must be added to the store
expansion when choosing the size of the feed and expansion tank.
The weight of each tank when full is 27kg (not including pipework and valves).
2 Pump System
Max.
height
10m
Min. 250mm
2 Pump System With Dipped Boiler Flow and Return Pipe
Must comply
with boiler
manufacturer
instructions
Min. 250mm
Coil Performance
Nominal volume litres 150 180 210 250 350
(SP SOL) Primary coil only
Coil power at 7°C temp.
dierence kW34667
Average power kW 9 13 15 16 18
Coil power at 47°C temp.
dierence kW 23 26 33 32 36
Volume of water heated litres 84 102 130 144 230
Recovery time min 22 18 22 20 28
(SP SOL) Combined coils coil
Coil power at 7°C temp.
dierence [kW] 4 4 6 4 3
Average power [kW] 12 16 18 16 15
Coil power at 47°C temp.
dierence [kW] 25 36 39 36 41
Volume of water heated litres 150 180 210 250 350
Recovery time [min] 25 28 30 34 42
coil coguration series parallel parallel parallel parallel

Page 14 Page 15
INSTALLATION INSTALLATION
TORRENT STAINLESS OV TORRENT STAINLESS SP SOL
Sealed heating system
All Torrent Stainless SP models are suitable for
sealed heating systems up to 3.5 bar maximum
operating pressure, however the normal
pressure relief valve setting is 3.0 bar. The typical
layout of the open vented‘Y Plan’and‘S Plan’for
the indirect Torrent Stainless models is shown
in the diagrams on this page.
A boiler used in a sealed heating system must
be suitable for this application i.e. it must be
fitted with an overheat cut-out thermostat
and can be located above the thermal store
F&E tank, as can the central heating system
connected to the boiler.
It is recommended that the F&E tank (for the
thermal store) is tted at a high level in the same
cupboard as the Torrent Stainless. However
it can be fitted remotely up to 10m above
the base of the Torrent Stainless, and sized to
accomodate the expansion of the cylinder and
any attached central heating and solid fuel
volumes.
The F&E tank overow/warning pipe should
be installed in a material suitable for a heating
system feed and expansion tank.
There shall be no permanent connection to
the mains water supply for lling the heating
system even through a non-return valve
without the approval of the Local Water
Authority. An approved lling loop is required
for lling the heating system, which should be
disconnected after commissioning the system.
The filling loop should be located adjacent
to the boiler along with a suitable expansion
vessel, pressure gauge, pressure relief valve and
discharge arrangement.
The minimum system pressure should not be
less than the static head plus 0.5 bar i.e. the
height of the highest point in the system above
the expansion vessel plus a margin of 0.5 bar.
A solid fuel boiler is also able to be connected
to the Torrent Stainless SP, please refer to page
19 for further information.
Where a sealed primary coil is used, the thermal
store is a hot water only thermal store. If too
much heat is taken out of store, then hot water
performance will be limited. The hot water priority
should be protected by use of an appropriate
thermostat. Heating can be taken from the SP
thermal store to provide auxilliary heating to
towel radiators, which are low output. It is not
suitable for full central heating systems, this
should be taken directly from the boiler.
The two diagrams shown on this page show
how an ‘S’ plan and ‘Y’ plan may be used in
conjunction with the Torrent Stainless OV, with
another space heating supply being taken
direct from the store.The type of space heating
used is the installer’s choice and the diagrams
only show possible layouts.
The auto bypass is positioned here to allow
minimum flow rates through the boiler as
TRVs close; and to allow for boilers with pump
overrun.
Off delay timers may be considered for use
in situations where the boiler pump overrun
is controlled by sensing a temperature drop
before shutting off. This type of boiler may
cause the pump to run on for some minutes
while the temperature slowly drops, but the
store temperature may also drop causing the
boiler to re again; the boiler then short cycles.
If an o delay timer is used it allows the pump
to overrun for about a minute to remove any
excess heat; then shuts o the pump, but it does
not remove so much of the heat from the store
that it causes the boiler to re again.
A solid fuel boiler is also able to be connected
to the Torrent Stainless OV, please refer to page
19 for further information.
S Plan Sealed Main Heating System
Max.
height
10m
Sealed
system kit
Auxiliary
heating
Min.
250mm
S Plan Open Vented Heating System
Max.
height
10m
Min. 250mm
Auxiliary
central heating
Y Plan Open Vented Heating System
Max.
height
10m
Min. 250mm
Auxiliary
central heating
Y Plan Sealed Main Heating System
Max.
height
10m
Sealed
system kit
Auxiliary
heating
Min.
250mm

Page 16 Page 17
S Plan Open Vented Heating System Including Solar Input
Auxiliary
central
heating
Solar
controller
Expansion
vessel
Pressure
relief
Solar pumping station
Min. 250mm
Y Plan Sealed Primary Heating System Including Solar Input
Auxiliary
central
heating
Solar
controller
Expansion
vessel
Pressure
relief
Solar pumping station
Sealed
system
kit
INSTALLATION INSTALLATION
TORRENT STAINLESS SOL TORRENT STAINLESS SOL
Solar heating circuit
The Torrent Stainless SOL is an advanced
thermal store and has been designed to
incorporate existing boiler and central heating
controls and is based on the tried and tested
standard Torrent Stainless range. Therefore
general design requirements for hot and cold
water systems, for ball valve and overow, for
water treatment and for heating system design
should be taken into account when designing
the Torrent Stainless SOL based systems.
The diagram opposite shows the Torrent
Stainless SOL type used in a traditional open
vented heating system. The water level in the
F&E tank should be at least 250mm above
the highest point of the heating system e.g.
a radiator.
In the open vented system shown opposite,
the thermal store, radiator heating circuit and
the auxilliary heating circuit are all fed from
the same feed and expansion tank. Therefore it
should be sized to accommodate the expansion
of total water content of the complete system
(i.e. water content of the store + water content
of radiator heating circuit + water content of
under-oor heating circuit).
The diagram opposite shows the sealed primary
‘SP’ variant of the Torrent Stainless SOL used
in a typical sealed heating system. With this
system arrangement, although the boiler and
the radiator central heating circuits are sealed,
both the store and the auxilliary heating circuit
(if installed) are open vented. Therefore the
feed and expansion tank should be sized to
accommodate the expansion of total water
content of the open vented system (i.e. water
content of the store + water content of under-
oor heating circuit).
The diagrams also show typical congurations
of a solar thermal system with Torrent Stainless
SOL, which will accumulate the energy from
more than one renewable energy sources (e.g.
solar, wood burning stove).
In the open vented system, this energy is
available for hot water and at low level for both
radiator and under-floor (if installed) space
heating circuits. However in the sealed primary
system configuration, this energy is only
available for hot water and at low levels for the
under-oor space heating circuit (if installed).
For maximising the use of the renewable‘green’energy, the system should be managed
and controlled so that unnecessary ring of the boiler is kept to a minimum.This can be
achieved by a combination of householder use of the system and controls, for example;
Use the store to provide shower or a bath to utilise the heat gained by the system
from the previous day’s solar energy input. Alternatively showering or bathing in the
evening will utilise the energy that has been stored during the day from the solar
system.
• As with any system, hot water and space heating should be programmed according
to house holder requirements. However it is always good to remember that to gain
maximum advantage from the solar panels, the store should be as cool as possible,
prior to expected periods of high solar gain. To achieve this in spring, summer and
autumn, the hot water channel of the boiler should be programmed to come on 30
minutes before the hot water is required in the morning and then programmed o
before volumes of water are drawn o the system. This way the store is depleted
of heat allowing maximum transfer from the solar system during the day.
• However further supplementary time periods for the boiler will be required in
winter when not much solar energy is available.
• Uncontrolled boiler operation can also be reduced by tting and wiring a pipe
thermostat on the solar return pipe close to the Torrent Stainless SOL.
As part of setup and commissioning, it is important that this boiler hold-o pipe
thermostat be adjusted to nd the best setting for each individual installation.
Failure to do so will give under performance of either the boiler or the solar heating
system.
A solid fuel boiler can also be connected to the Torrent Stainless SOL, please refer to
page 19 for further information.
Domestic overheat protection
To comply with building regulations the solar overheat thermostat should be set at
a temperature which prevents the contents of the thermal store exceeding 100°C.
The DHW production board does not incorporate an overheat function, linked to the
primary store temperature, which would prevent it from running when this exceeds
80°C. The DHW temperature and ow rate are measured accurately and virtually
instantaneously by the HUBA ow sensor. The software algorithm is therefore enabled
to react virtually instantaneously to raised DHW temperatures.
The PWM pump ow rate will be reducing as the DHW temperature rises above 60°C
and fully stopped if the sensed DHW reaches 80°C.Thereby, theTorrent Stainless DHW
production is limited to 80°C in normal operating conditions, and does not need an
inline hot water tempering valve to limit the domestic hot water system to 60°C (see
part G para 3.64). However, this does not remove the obligation on the installer to
observe building regulations and water supply regulations recommendations.
In any installation, the hot water supply to a bath should be limited to 48°C by the use of
an inline blending valve (see part G para 3.65). In addition, the Water supply regulations
1999 (WRAS) recommends thermostatically controlled mixers should be used in all
installations, particularly where children in schools or aged or disabled people are
using showers in public buildings and are unsupervised. (see R18.5 section 8 page 9).

Page 18 Page 19
Gravity Flow Solid Fuel Boiler Pipe Layout
Min. 250mm
Normally open
2 port valve
Pipe
stat 1
Overheat
stat 3
(82°C)
Solid
fuel
vent
Feed and expansion tank sized to include
the expansion of solid fuel boiler, open vented
boiler and open vented central heating
This circuit usually uses gravity circulation.
Good circulation depends on the system height and the
temperature difference between the hot flow and the cool
return to provide the motive force to overcome the frictional
resistance in pipe and fittings and provide circulation.
Normally closed
2 port valve
Heat sink radiator
(ensure lockshields
are left fully open)
Multi-fuel stove
Control
stat 2
(30°C-90°C)
Normally open
2 port valve
Solid Fuel Option
All models of the Torrent Stainless shown in this installation manual have the tappings
included as standard for a solid fuel boiler. In the absence of recommendations from
HETAS or the solid fuel boiler manufacturer, we would advise the following pipe layout
to achieve the best performance from your solid fuel system and our thermal store.
This diagram represents a good example of a gravity circulation pipe layout. Points
to note are;
• All pipework rises towards the cylinder and the heat sink radiator and fall back
towards the solid fuel burner.
• The heat source is below the cylinder which gives the layout a good system height.
• All gravity circulation pipework is recommended to be 28mm or above pipe
diameter, at low ow speeds the pipe resistence is negligible in this pipe diameter.
• Avoid long horizontal runs and try to make the ratio horizontal:vertical to be a
maximum of 20:80.
To ensure that the solid fuel boiler does not overheat the thermal store during its
operation and prevent gravity circulation cooling the thermal store when it is not,
the following controls can be used. Other methods of control can be used; HETAS
and/or the solid fuel boiler manufacturers instructions should be consulted. This
control system is fed from a dedicated fuse spur to enable safe isolation for changing
components. All wiring should comply with BS7671 Requirements for Electrical
Installations latest edition.
Typical components (not supplied but available to purchase from Gledhill Spares Ltd);
• Honeywell V4043B1265 (XB165) - 28mm compression normally open 2 port valve
• Honeywell V4043H1106 (XC012) - 28mm compression normally closed 2 port valve
• Honeywell L641B1012 (XC016) - Pipe thermostat
• (XC010) - Control thermostat 2
• (XC011) - Overheat thermostat 3
INSTALLATION INSTALLATION
TORRENT STAINLESS SP SOL SOLID FUEL BOILERS
When the boiler is lit, the water temperature
raises. When the temperature is above pipe
thermostat 1 set point, the contacts close
signalling the normally closed valve to move
open. Once it is fully open, it signals the
normally open valve to motor there by closing
it. The thermal store now receives heat from the
solid fuel boiler via gravity circulation.
If control stat 2 set point is exceeded then the
power to the normally closed valve is cut which
in turn cuts the power to the normally open
valve. Excess heat from the solid fuel boiler is
then circulated around the heat sink radiator.
Careful selection of the pipe and control
thermostat set points should be made during
commissioning to get the best performance
from the system.
Setting control stat 2 at too high temperature
will cause dripping at overheat stat 3. We
recommend that there is a gap of at least 7°C
between the two stats. Therefore 75°C is ideal.
If temperatures in store exceed 82°C the
secondary protection will cut o the power
(overheat stat 3) in accordance with Part G3 of
Building regulations.
With regards to the domestic hot water
overheat protection, please refer to page 17 in
this installation manual.
Feed and Expansion Tank
A feed and expansion cistern supplying a system
heated by wet solid fuel appliance should either
be of metal construction (copper, stainless
steel etc.) or manufactured of a material
that has been certied as being suitable for
temperatures up to 110°C. These are available
to order from Gledhill at the time of purchase.
The capacity of the cistern should be at least
one twentieth of the total system volume.
The cistern should be tted with a brass oat
operated valve that is manufactured to BS1212
Pt. 2 and is tted with an appropriately sized
copper oat. The overow pipe should be either
made of metal or manufactured from a material
that has been certied as being suitable for
temperatures up to 110°C. The overow pipe
must have appropriate support – for plastics
this may require continuous support.
Torrent Stainless SP SOL boiler only
Where the Torrent Stainless SP SOL product is
selected to be used purely with a sealed primary
boiler, by combining the boiler and solar coils
the volume of heated water will increase.
The diagrams opposite show the pipe
configurations recommended to maximise
the boilers input where the two coils are utilised.
The 150 litre model internal coils can be
connected in series, with the SP boiler return
connected to the solar ow.
We recommend the 180 to 350 litre models
are connected in parallel to maximise the heat
transfer into the cylinder.
Coil Connection With Boiler Input Only (150 litre models)
Sealed
system
kit
Central Heating Return
Central Heating Flow
Coil Connection With Boiler Input Only (180-350 litre models)
Central Heating Return
Central Heating Flow
Sealed
system
kit

Page 20 Page 21
INSTALLATION INSTALLATION
PRIMARY HEAT SOURCE CONTROL WIRING DIAGRAM
Normally Closed
2 Port Valve
Normally Open
2 Port Valve
E
EL N
NSLPLML
5
A
Local
double
pole
isolator
CH Programmer
LN 1 4
3
Room Thermostat
ON OFF
ONOFF
1
E 2 4
3
Control
Stat 2
1C 2
Pipe Thermostat 1
1C 2
1 2 3 4 5 6 7 8 9 10 11 12
Torrent Stainless electric only (direct option) and auxiliary heating control system
Junction
NL E 1 2 3
on off
on off
Overheat
Stat
1C
on
ON
OFF
24 hour domestic supply [Off-peak during 00:00 – 07:00 E7]
ON
OFF
MCB
ON
OFF
MCB
B16
ON
OFF
MCB
ON
OFF
MCB
ON
OFF
MCB
Hot
Water
Top On-Peak 3kW Immersion heater Bottom Off-Peak 3kW
Immersion heater
Off-peak
controller
2 Pole
Isolator
switch
Consumer unit
Central
heating
pump
E N L
Clock
2
Primary Heat Source Control Sensor / Thermostat Pockets
In all thermal stores heated by a primary heat source e.g. a boiler (with the exception of
direct thermal stores heated by immersion heaters with integral control and overheat
thermostats), the thermostat and sensor pockets for controlling the system are be
designed and located to sense the bulk water temperature.
The Torrent Stainless thermal stores have been tted with four store thermostat/sensor
pockets, with their position complying with the HWA Performance Specication for
Thermal Stores 2010 (section 6.4).
When two control thermostats / sensors (S1 and S2) are tted their operating control
logic should be as follows: -
(a) The primary heat source should be switched‘ON’when both sensors (thermostats),
S1 and S2 are calling for heat.
(b) The primary heat source should only be switched ‘OFF’ when both sensors
(thermostats), S1 and S2 stop calling for heat.
Note: A typical wiring arrangement for 2 thermostats is shown in gure 8.1.
Store Thermostat(s) For Controlling Primary Heat Source
The specified store thermostat setting for controlling the primary heat source
should prevent unnecessary cycling of the heat source (e.g. the boiler) on its internal
thermostat for ecient operation.
All types of thermal stores must be supplied with one or more thermostats or electronic
controls with an adjustable range of up to 90°C and span not greater than 70°C. The
switching dierential of the thermostat should be 6°C±1°C.
A strap on surface cylinder thermostat is not considered suitable for this application.
VS1
VS2
S2
S1
HWA Specification for thermal stores 2010 Final version: 21/03/2010 51/78
8. SPECIFICATION OF COMPONENTS
8.1 GENERAL
All types of thermal stores can either be supplied with all the components ready fitted
and wired or full wiring and system configuration details, and the list of recommended
components (e.g. pumps, delay timers) should be provided in the design and installation
manuals.
8.2 STORE THERMOSTAT(S) FOR CONTROLLING PRIMARY HEAT SOURCE
8.2.1 The specified store thermostat setting for controlling the primary heat source
should prevent unnecessary cycling of the heat source (e.g. the boiler) on its
internal thermostat for efficient operation.
8.2.2 All types of thermal stores must be supplied with one or more thermostats or
electronic controls with an adjustable range of up to 90oC and span not greater
than 70oC. The switching differential of the thermostat should be 6+1oC.
8.2.3 A strap on surface cylinder thermostat is not considered suitable for this
application.
8.2.4 The store control thermostats should be either:-
(a) Non-user adjustable and pre-set to switch off at the specified temperature to
guarantee the performance.
OR
(b) Capable of being locked in the correct user zone and should switch off at the
specified temperatures within the zone to guarantee the performance.
8.2.5 For improved utilisation of thermal store and lower in-use system losses, it is
recommended that the thermal stores of capacity greater than 250 litres can be
c
1
2
c
1
2
c
c
230Vac, 50HZ
Mans supply
L N
Bottom
store
thermostat
Top store
Thermostat
2 Pole CO relay
230Vav coil
NC
NO
NC
NO
L
N
Heat source
Control supply
C = Common contact C = Common
C-1 = Close on temperature rise NO = normally open
C-2 = Close on temperature drop NC = normally closed
Figure 8.1 : Example of twin thermostat control circuit wiring for thermal stores
HWA Specification for thermal stores 2010 Final version: 21/03/2010 51/78
8. SPECIFICATION OF COMPONENTS
8.1 GENERAL
All types of thermal stores can either be supplied with all the components ready fitted
and wired or full wiring and system configuration details, and the list of recommended
components (e.g. pumps, delay timers) should be provided in the design and installation
manuals.
8.2 STORE THERMOSTAT(S) FOR CONTROLLING PRIMARY HEAT SOURCE
8.2.1 The specified store thermostat setting for controlling the primary heat source
should prevent unnecessary cycling of the heat source (e.g. the boiler) on its
internal thermostat for efficient operation.
8.2.2 All types of thermal stores must be supplied with one or more thermostats or
electronic controls with an adjustable range of up to 90oC and span not greater
than 70oC. The switching differential of the thermostat should be 6+1oC.
8.2.3 A strap on surface cylinder thermostat is not considered suitable for this
application.
8.2.4 The store control thermostats should be either:-
(a) Non-user adjustable and pre-set to switch off at the specified temperature to
guarantee the performance.
OR
(b) Capable of being locked in the correct user zone and should switch off at the
specified temperatures within the zone to guarantee the performance.
8.2.5 For improved utilisation of thermal store and lower in-use system losses, it is
recommended that the thermal stores of capacity greater than 250 litres can be
c
1
2
c
1
2
c
c
230Vac, 50HZ
Mans supply
L N
Bottom
store
thermostat
Top store
Thermostat
2 Pole CO relay
230Vav coil
NC
NO
NC
NO
L
N
Heat source
Control supply
C = Common contact C = Common
C-1 = Close on temperature rise NO = normally open
C-2 = Close on temperature drop NC = normally closed
Figure 8.1 : Example of twin thermostat control circuit wiring for thermal stores
HWA Specification for thermal stores 2010 Final version: 21/03/2010 51/78
8. SPECIFICATION OF COMPONENTS
8.1 GENERAL
All types of thermal stores can either be supplied with all the components ready fitted
and wired or full wiring and system configuration details, and the list of recommended
components (e.g. pumps, delay timers) should be provided in the design and installation
manuals.
8.2 STORE THERMOSTAT(S) FOR CONTROLLING PRIMARY HEAT SOURCE
8.2.1 The specified store thermostat setting for controlling the primary heat source
should prevent unnecessary cycling of the heat source (e.g. the boiler) on its
internal thermostat for efficient operation.
8.2.2 All types of thermal stores must be supplied with one or more thermostats or
electronic controls with an adjustable range of up to 90oC and span not greater
than 70oC. The switching differential of the thermostat should be 6+1oC.
8.2.3 A strap on surface cylinder thermostat is not considered suitable for this
application.
8.2.4 The store control thermostats should be either:-
(a) Non-user adjustable and pre-set to switch off at the specified temperature to
guarantee the performance.
OR
(b) Capable of being locked in the correct user zone and should switch off at the
specified temperatures within the zone to guarantee the performance.
8.2.5 For improved utilisation of thermal store and lower in-use system losses, it is
recommended that the thermal stores of capacity greater than 250 litres can be
c
1
2
c
1
2
c
c
230Vac, 50HZ
Mans supply
L N
Bottom
store
thermostat
Top store
Thermostat
2 Pole CO relay
230Vav coil
NC
NO
NC
NO
L
N
Heat source
Control supply
C = Common contact C = Common
C-1 = Close on temperature rise NO = normally open
C-2 = Close on temperature drop NC = normally closed
Figure 8.1 : Example of twin thermostat control circuit wiring for thermal stores

Page 22 Page 23
INSTALLATION INSTALLATION
WIRING DIAGRAMS WIRING DIAGRAMS
Normally Open
2 Port Valve
EL N
Control
Stat 2
1C 2
on off
Overheat
Stat
1C
on
L N E
Mains supply
230VAC ~ 5 Amp
5
A
Local
double
pole
isolator
Boiler pump
Boiler wiring terminals
L N E SL L N E
boiler pump
CH & HW Programmer
HW
OFF
HW
ON
CH
OFF
CH
ON
LN 1 4 32
B
r
Br
Room Thermostat
ON OFF
1
E 2 4
3
Store stat
ON OFF
CE 1 2
1 2 3 4 5 6 7 8 9 10 11 12
E N L
Central heating
pump
L N E
Torrent Stainless with 2 pump heating control system and typical solar heating system
PRV
Solar
pumping
station
Solar panels S1
S1 : Solar flow temperature sensor
S2 : Solar zone store temperature sensor
S3 : Store overheat temperature sensor/Thermostat
P1
S2
S3
Torrent Stainless SOL
E C NC
Junction
Solar controller
Overheat
thermostat
(S3)
L N E L N E S2 S1
Solar
Pump
230Vac
50Hz
supply
L N E SLNL E 1 2 3
E C 1 2
on off
NOTE
Some solar controllers, the overheat protection is provided by a temperature sensor,S3,
which is wired directly to the solar controller same as sensors S1 and S2
In this case the mechanical overheat thermostat (S3) shown in this diagram is not required and
the solar pump is wired straight to the solar controller.
NOTE
As part of system setup and commissioning, it is important that this boiler hold-off pipe thermostat
be adjusted to find the best setting for each individual installation.
Failure to do so will give under performance of either the boiler or the solar heating system
Normally Closed
2 Port Valve
EN SLPLML
Pipe Thermostat 1
1C 2
on off
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
NOTE
Hot Water Programmer and Store Stat
control the boiler in Central Heating mode

Page 24 Page 25
INSTALLATION INSTALLATION
WIRING DIAGRAM WIRING DIAGRAM
Normally Open
2 Port Valve
EL N
Control
Stat 2
1C 2
on off
Overheat
Stat
1C
on
L N E
Mains supply
230VAC ~ 5 Amp
5
A
Local
double
pole
isolator
System pump
Boiler wiring terminals
L N E SL L N E
boiler pump
CH & HW Programmer
HW
OFF
HW
ON
CH
OFF
CH
ON
LN 1 4 32
B
r
Br
Room Thermostat
ON OFF
1
E 2 4
3
Store stat
ON OFF
CE 1 2
G/
Y
N E
Bl
3-Port
Flow share valve
1 2 3 4 5 6 7 8 9 10 11 12
W
hit Gr
e
y
Or
an
g
e
E N L
Torrent Stainless with ‘Y’ Plan heating control system and typical solar heating system
PRV
Solar
pumping
station
Solar panels S1
S1 : Solar flow temperature sensor
S2 : Solar zone store temperature sensor
S3 : Store overheat temperature sensor/Thermostat
P1
S2
S3
Torrent Stainless SOL
E C NC
Junction
Solar controller
Overheat
thermostat
(S3)
L N E L N E S2 S1
Solar
Pump
230Vac
50Hz
supply
L N E SLNL E 1 2 3
E C 1 2
on off
NOTE
Some solar controllers, the overheat protection is provided by a temperature sensor,S3,
which is wired directly to the solar controller same as sensors S1 and S2
In this case the mechanical overheat thermostat (S3) shown in this diagram is not required and
the solar pump is wired straight to the solar controller.
Normally Closed
2 Port Valve
EN SLPLML
Pipe Thermostat 1
1C 2
on off
NOTE
As part of system setup and commissioning, it is important that this boiler hold-off pipe thermostat
be adjusted to find the best setting for each individual installation.
Failure to do so will give under performance of either the boiler or the solar heating system
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.

Page 26 Page 27
Normally Open
2 Port Valve
EL N
Control
Stat 2
1C 2
on off
Overheat
Stat
1C
on
L N E
Mains supply
230VAC ~ 5 Amp
5
A
Local
double
pole
isolator
System pump
Boiler wiring terminals
L N E SL LN E
boiler pump
CH & HW Programmer
HW
OFF
HW
ON
CH
OFF
CH
ON
L
N 1 4 3
2
B
r
B
r
Room thermostat
ON OFF
1E 24
3
Store stat
ON OFF
CE 1 2
1 2 3 4 5 6 7 8 9 10 11 12
Central heating
Zone valve
L N E S1 S2
Bl G/
Y
B
r
Or
an
ge
Gr
e
y
Junction box
E N L
Hot water heating
Zone valve
L N E S1 S2
Bl G/
Y
Br
Or
an
ge
Gr
e
y
Torrent Stainless with ‘S’ Plan heating system with typical solar heating system
PRV
Solar
pumping
station
Solar panels S1
S1 : Solar flow temperature sensor
S2 : Solar zone store temperature sensor
S3 : Store overheat temperature sensor/Thermostat
P1
S2
S3
Torrent Stainless SOL
E C 1 2
on off
NOTE
With some solar controllers do not have overheat sensor, S3, as shown above
In this case the mechanical overheat thermostat (S3) may used and wired as
shown in figure 4.4 to protect the store from over heating by stopping the solar
Pump at pre-set temperature limit
S1 S2 S3 E N R1 N R1 N L
1 2 3 4 5 6 7 8 12 13 14 15 16 17 18 19 20
Solar controller
NL E 1 2 3
Normally Closed
2 Port Valve
EN SLPLML
Pipe Thermostat 1
1C 2
on off
NOTE
As part of system setup and commissioning, it is important that this boiler hold-off pipe thermostat
be adjusted to find the best setting for each individual installation.
Failure to do so will give under performance of either the boiler or the solar heating system
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
INSTALLATION INSTALLATION
WIRING DIAGRAM WIRING DIAGRAM

Page 28 Page 29
INSTALLATION INSTALLATION
COMMISSIONING IMPORTANT DO’S AND DONT’S
DO - Check the incoming mains water pressure. If it exceeds 5.0 bar at any point
in the 24 hour cycle then a pressure limiting valve set at 3.0 bar should be
tted where the cold supply enters the property.
DO - Check the ow rate of the incoming cold water main is adequate to meet
the maximum hot and cold water simultaneous demands.
DO - Check that all connections are in accordance with the schematics on pages
6 and 7.
DO - Fill the tank manually or adjust the ballvalve so that the water in the F & E
tank is set to the correct level.
DO - Restrict the ballvalve ll rate when full so that the overow pipe can cope
with the ll rate in the event of a ballvalve failure.
DO - Make sure there is adequate clearance above the F & E tank to service the
valve.
DO - Ensure that range-rated appliances are set to the specied design heat
input and the boiler thermostat is set to maximum for all boilers.
DO - Ensure that the water level in the expansion tank is at least 250mm above the
highest point on the radiator circuit and satises the boiler head required.
DO - Insulate any exposed pipework in the Torrent cupboard.
DO - Plumb the overow warning pipe in 20mm minimum internal diameter
tubing to discharge in a conspicuous external position, using high
temperature uPVC or copper.
DO - Leave the electricity switched on to the appliance once it has been lled
and commissioned to prevent the pump sticking.
DON’T - Use a combined feed and vent on Torrent indirect installations.
DON’T - Use tube smaller than 28mm between boiler and Torrent when the boiler
exceeds 60,000 Btu (17kW) output.
DON’T - Use dipped ow and return pipes between boiler and Torrent unless the
boiler is tted with an overheat switch, then follow the recommendations
on pages 13/15/16.
DON’T - place any clothing or other combustible materials against or on top of this
appliance.
Torrent Stainless OV Models (heated by electricity only)
Ensure that the thermal store is lled with water to the water level mark inside the
feed and expansion tank and the ball valve (if tted) is adjusted correctly.
If a ball valve is tted turn down the service valve once the system is nally lled to
the point where the warning/overow pipe will cope with the discharge arising from
a ball valve failure.
Switch the immersion heater on and allow the store to heat up to full temperature.
The Torrent Stainless will produce at least its actual volume as DHW above 40°C when
its entire contents are at between 75°C and 80°C.The tolerances of immersion heater
thermostats is quite large so care must be taken to ensure that the correct temperature
is achieved during commissioning to ensure that the desired performance is achieved.
This means that the control thermostat may need to be set at 73°C on some cylinders,
due to the temperature gradient through the store. The actual set point must set up
and checked during commissioning by the installer. The rod thermostats (XB081) used
in these immersion heater incorporate an overheat component which will operate
at circa 85°C.
Instruct the occupant on how to use the o-peak timer (if tted) and the appliance.
At the time of commissioning, complete all relevant sections of the Benchmark
Checklist located on the inside back pages of this document.
Electrician/Installer: Please note that water at the hot tap does not indicate that the
Torrent Stainless is full. Check that there is water in the feed and expansion tank before
switching on the immersion heaters. Dry ring the elements will cause premature
failure which is not covered by our warranty.
Non-Electric Torrent Stainless Models
Open the incoming stop valve and ll the domestic hot water system. For open vented
heating system, ll the whole of the primary heating system and the thermal store
with potable water through the feed and expansion tank. For sealed heating system
ll the thermal store with potable water through the feed and expansion tank and
the heating system to the design pressure using the lling loop.
Check the water level in the feed and expansion tank and adjust the ball valve if
necessary. Check the whole of the primary heating and domestic hot and cold
distribution system, including the Torrent Stainless for leaks.
It is essential that all systems function properly for optimum performance and to
achieve this:-
• The primary system should be commissioned in accordance with good practice
and generally in accordance with the requirements of BS 6798, BS EN 12831, the
CIBSE guide and BS 7593. Full details of the requirements are given in PAS 33:1999
under section 10 Commissioning.
• The boiler manufacturers instructions should be followed during the commissioning
phase.
• If a solar thermal system is tted it should be commissioned as per manufacturers
instructions to ensure compliance with Building regulations.
• When using either cleansing or corrosion inhibitor chemical, the manufacturers
instructions must be followed.
When determining the quantities of cleanser required, the volume of the Torrent
Stainless should be added to the water content of the primary system. Although the
Torrent Stainless has no special water treatment requirements, the radiators and other
parts of the circuit will require the application
of a scale and corrosion inhibitor.
If it is proposed to ‘powerflush’ the heating
system we would recommend that theTorrent
Stainless is isolated from the heating system
being cleaned, as debris from the system could
be washed into the Torrent Stainless and could
impair its performance or seriously damage the
unit. If in doubt please contact our Technical
Helpline on 01253 474584.
• Fill the system and ush cold and then rell
and vent the system.
• Add cleanser such as Fernox to ensure
that flux residues and the installation
debris are removed from the system (check
with manufacturer for compatability with
stainless steel).
• Ensure that the store thermostat is set
correctly and the boiler thermostat is set at
its maximum.
• Switch on the system and to ensure full
cleansing, circulation to all parts of the
system should continue for a minimum of 1
hour.
• Flush the system hot having checked that
there is no overflow or leaks when the
system is up to temperature.
• Refill and vent the system and add
appropriate amount of scale inhibitor, such
as Fernox (check with manufacturer for
compatability with stainless steel).
Set the boiler temperature to maximum and
with the central heating o, let the system (i.e.
store) heat up (Approximately 1 – 2 hours).
When the store is up to temperature: -
• Check that the space heating system
controls (e.g. programmer, room thermostat)
are functioning correctly.
Switch o space heating system and ensure
that the store thermostat is set correctly and the
boiler thermostat is set to maximum.
Re-re the boiler by running a little water and
wait for the boiler to switch o. Check that there
is no live supply from the store thermostat i.e.
it is satised.

Page 30 Page 31
INSTALLATION SERVICING AND MAINTENANCE
INSTALLATION REVIEW SERVICING AND MAINTENANCE
Annual Servicing
No annual servicing of the Torrent Stainless is necessary.
However, if required, a hot water performance test can be carried out to prove the
appliance is working satisfactorily and within its specication.
We recommend electrical inspections are carried out regularly. Please seek advice
from a qualied electrician.
If it is decided to carry out the above test, the water level in the top cistern should
also be checked and if necessary topped up.
Changing Components
Failed components should be returned during the in-warranty period on return of
the faulty part (normally 12 months) via the local authorised supplier. A nominal
charge of £30 will be made which is refunded in full by Gledhill on receipt of the
original part and proof of purchase.
After this, spares can be obtained direct from Gledhill Spares, or through any of the
larger plumbers merchants/specialist heating spares suppliers.
Help and advice is also available from the Technical Helpline on 01253 474584.
However, all components are readily accessible and can be changed quickly and easily
by the installer using common plumbing/electrical practice.
Note: All maintenance work on the Torrent Stainless must be carried out by a
competent trades person.
After servicing, complete the relevant Service Interval Record section of the Benchmark
Checklist located on the inside back pages of this document.
Circulating uid in thermal store pipework
• The Torrent Stainless and the thermal store pipework must have completed lling
prior to switching the electricity supply to the PWM controller PCB. If there is no
water in these pipes then there may be signicant wear on the PWM pump.
• This can be conrmed by
- Checking the thermal store pipework servicing valves are open
- Loosening the connection points on the thermal store pipework in a systematic
manner and checking for water presence.
- Conrming that the feed and expansion tank has completed lling and the
servicing valve is open.
Cold mains water supply to plate heat exchanger and hot water taps
• Conrm that the CW mains stop valve is open
• Open all HW taps and conrm that the water runs freely and that any air is bled
from the DHW system
• Determine the maximum ow rate obtained and record
• Limited to 26.5l/min for all products
• If ow rate not as expected determine the cause and rectify
- clean inline strainer
- check the ow restrictor is present and not blocked. It is located in the top of
the inline strainer
Power on
• Switch on the Local fuse spur and observe the PWM pump
• Open a HW tap and observe the PWM pump
• The green LED will be constantly lit showing the pump has a power supply and is
running to generate HW
NOTE: -The thermal store will only produce hot water when it is hot enough. A mid
40°C thermal store temperature will provide very little hot water, higher thermal store
temperatures will provide more, 75°C is recommended.
Inline scale inhibitor (if tted)
• Check power supply
• PWM Controller PCB supplies a maximum of 12vDC/300mA to the Scale inhibition
board. (From J3)
• Check dip switches set correctly
• The correct settings for tube diameter 22mm is switch no. 3 on.
• Switch no. 4 can be either on or o.
• If the switch no. 4 is turned on the output electromagnetic eld is generated
harmoniously otherwise the eld is generated inharmoniously.

Page 32 Page 33
SERVICING AND MAINTENANCE SERVICING AND MAINTENANCE
FAULT FINDING FAULT FINDING
UNSATISFACTORY
HOT WATER
PERFORMANCE
Is the power supply
to the PHE controller
switched on
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
NO
NO
NO
NO
NO
Switch it on
Follow the
fault nding
chart
Is the boiler
thermostat
set to max?
Is the model
suitable for the
hot water
requirement?
Change for
correct
model
Change boiler
for larger
model
Adjust boiler
thermostat to
maximum
Is the Torrent
thermostat set
too low?
Is the boiler
output at least
10% more than the
rad. loading?
Does the boiler
ow reach
temperature?
Is the boiler
thermostat
adjustable?
Correct Torrent
thermostat setting
(set to 75ºC)
Report to the
boiler
manufacturer
Adjust to
maximum
Descaling
of the PHE
required
Is heat
exchanger
scaled up
internally?
(Indicated by
reduction of
ow rate)
Alter pipe
sizes
Does the temp
rise across the
boiler exceed 11°C
Increase boiler
pump setting
H.W. ow too
great?
Is the temp.
rise too high?
Regulate ow
from outlet tting
(tap)
Is the circuit
correctly sized?
Fit an air vent
Is the temp.
rise now
satisfactory?
Investigate for
blockage
Is air
trapped in
the primary
circuit?
Test Equipment
The initial assumption in this procedure is that the plumbing and water supply is
working eectively. If in doubt please conrm and refer to the end of this section for
advice on specic components.
A multi meter, a weir gauge and a thermometer will be required to conrm that all
the components are working eectively.
The PWM controller PCB manufacturer suggests“Fluke 87 TRUE RMS Multi meter” as
a suitable product. This will be able to measure;
- the frequency output from the Board to the pump
- the Duty cycle % output from the Board to the pump
Connection numbering
For reference the connections to the PCB are numbered below for
Logical sequence;
- check electrical connections fault nding section on page 34 rst to ensure your
own safety. This section will potentially identify any short circuited components
and/or wiring faults that need to be rectied before continuing to work on the
appliance.
- check that the correct information is being supplied to the board. This section will
identify if any sensors are faulty or out of tolerance.These will need to be replaced
before continuing
- check that the overheat link is present (J7 see page 37)
- check that the outputs to the board are being generated. If at this stage the board
does not provide the correct outputs then potentially the board should be replaced
- check the pump electrical circuit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
1
2
3
4
1
2
3
4
5 6 7 8
1
2
1
2
3
4
5
6
7
8
9
1
10
2 3
4 5 6
J18
J20
J19
J3 J7
J8
J1

Page 34 Page 35
SERVICING AND MAINTENANCE SERVICING AND MAINTENANCE
FAULT FINDING FAULT FINDING
Electrical power connections
Check inputs to the PWM Controller PCB
Reference schematic
opposite
Check procedure
Power supply to PWM
Controller PCB
Electrically isolate power supply at fused spur switch and remove fuse.
Earth continuity test (dead test) – to ensure that the appliance is earthed
Mains voltage test (dead test) - to ensure that the appliance is isolated
Resistance to earth (dead test) – to ensure that the wiring insulation to the product is intact
Short circuit test (dead test) – to ensure that no components in the products circuit have a short circuit
Visually inspect wiring is correct as per g 4.3
Connect supply
Polarity test (live test) - to ensure that the live is connecter to the live etc
• Check 230V ac across L1 to Earth
• Check 230V ac across L1 to N
• Check for 0 to 15V ac N to earth
Reference to“Boilerfault nder.com” gives clear instructions to on how to perform these tests. (Menu
options 1st. Boiler Fault nder 2nd. Electrical safety checks).
Reference schematic
opposite
Check procedure
CW temperature sensor Power o
Disconnect J18
Measure and record the resistance across terminals 6 and 13
Measure the cold water inlet temperature
Compare the resistance measured with chart“Tasseron NTC 12k thermistor”
The reading should make sense taking measurement conditions into consideration
TS temperature sensor Power o
Disconnect J18
Measure and record the resistance across terminals 3 and 10
Measure the thermal store temperature
Compare the resistance measured with chart“Tasseron NTC 12k thermistor”
The reading should make sense taking measurement conditions into consideration
HW temperature sensor Power o
Disconnect J18
Measure and record the resistance across terminals 7 and 14
Measure the Hot water temperature
Compare the resistance measured with chart“HUBA combined ow sensor and NTC 10k thermistor”
The reading should make sense taking measurement conditions into consideration
Flow sensor Power o
Disconnect J18
Power on Sensor required a power supply 5 VDC
Open a HW tap and set to a ow rate.
Measure and record the frequency across terminals 1 and 12
Compare the frequency measured with chart “ow rate determination”
The reading should make sense taking measurement conditions into consideration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
1
2
3
4
1
2
3
4
5678
1
2
1
2
3
4
5
6
7
8
9
1
10
2 3
4 5 6
J18
J20
J19
J3 J7
J8
J1 TS sensor
GND GND
IN OUT
T1 T2
1
2
CW sensor
1
2
Combined flow
and
HW temperature
sensor
L - Brown
PR61
E –G/Y
N - Blue
PWM -
PWM +
SPARE
Fuse
Dip
Switch 1 2 3 4
To
DHW
pipe
All the these sensor inputs carry a
Voltage of 5V.
The max cable length is 1 meter.
The sensors connected to the control
Should be free from the appliance earth
Resistance Resistance
Ohm °C ±°C Ohm °C ±°C
309396 -40 1.7 334275 -36 0.9
171840 -30 1.7 47369 -6 0.1
98932 -20 1.6 26023 50.1
58879 -10 1.5 11000 23 0.6
36129 01.4 10500 24 0.6
22804 10 1.4 10000 25 0.6
14773 20 1.3 9500 26 0.7
12000 25 1.2 9000 27 0.7
9804 30 1.2 8500 29 1.4
6652 40 1.1 8000 30 1.5
4607 50 17500 31 1.6
3252 60 0.9 7000 33 1.7
2337 70 1.1 6500 35 1.7
1707 80 1.3 6000 37 1.8
1266 90 1.5 5500 39 1.9
952 100 1.8 5000 41 2.1
4500 44 2.2
4000 47 2.3
3500 50 2.5
3000 54 2.7
2500 59 2.9
2000 65 3.3
1500 73 3.7
1000 86 4.3
R-nominal R-nominal
B-value B-value
R-Tolerance R-Tolerance
Tmin
Tmin
Tmax Tmax
125°C
under 25°C±0.025*T °C over 25°C±0.05*T °C
Huba combined flow sensor and NTC 10k thermistor
Tasseron NTC 12k thermistor
12Kohm @25°C
B3740K
3%@60°C
150°C
Temperature
Temperature
-40°C
-40°C
Used on the store temperature sensors and the
cold water inlet temperature sensors
12Kohm @25°C
B4050K
Flow volume determination
(Full range 1.8 to 32.0 l/min, restricted to 26. 5 l/min)
HZ L/min HZ L/min HZ L/min
25 1.9 125 10.4 225 18.8
30 2.3 130 10.8 230 19.2
35 2.8 135 11.2 235 19.7
40 3.2 140 11.6 240 20.1
45 3.6 145 12.1 245 20.5
50 4.0 150 12.5 250 20.9
55 4.4 155 12.9 255 21.3
60 4.9 160 13.3 260 21.8
65 5.3 165 13.7 265 22.2
70 5.7 170 14.2 270 22.6
75 6.1 175 14.6 275 23.0
80 6.6 180 15.0 280 23.5
85 7.0 185 15.4 285 23.9
90 7.4 190 15.9 290 24.3
95 7.8 195 16.3 295 24.7
100 8.3 200 16.7 300 25.2
105 8.7 205 17.1 305 25.6
110 9.1 210 17.5 310 26.0
115 9.5 215 18.0 315 26.4
120 9.9 220 18.4 320 26.8

Page 36 Page 37
SERVICING AND MAINTENANCE SERVICING AND MAINTENANCE
FAULT FINDING FAULT FINDING
Check for presence of overheat link
An overheat link connection should be present in connection Junction 7. If you are
tting a new board the overheat link that is on the board just removed must be retained
as the newly supplied board will not have one tted.
Check outputs from the PWM controller PCB to the pump
Check pump electrical circuits
PWM pump power Check 230V ac across Junction 8, L(10) to E(6) and L(10) to N(8) (live test)
Check for 0-15V ac across Junction 8, N(8) to E(6) (live test)
PWM frequency Power on the unit
Set the multi meter to measure the frequency
Measure the PWM frequency produced by the board between pins 3 on J8 and pin 9 on J8
This can be between 100Hz – 5000 Hz (1000Hz nominal)
(Lab tested gure of 562Hz recorded in steady state conditions).
Duty cycle Switch your Multimeter to ‘duty cycle or %’ then it will show a percentage from 0 to 100%.
This percentage is the command for the pump how fast it should run.
When you perform a small DHW tapping, the percentage will be low
When you perform a large DHW tapping, the percentage will be higher
PWM input signal [%] indications
• 0-7 Pump stops (Standby)
• 7-15 Pump runs at minimum speed (operation)
• 12-15 Pump runs at minimum speed (start-up)
• 15-95 Pump speed increases linearly from minimum to maximum
• > 95 Pump runs at maximum speed
LED Meaning Diagnosis Cause Remedy
Lights solid green Normal running Pump runs according
PWM input
Normal operation n/a
Blinks red/ green Abnormal running mode
-pump stopped but still
functional
The pump has stopped
due to external failure
Pump restarts by itself
after the fault has
disappeared
Under voltage U<160 V
or
Over voltage U>253 V
Check voltage supply
195 V <U< 253 V
Pump overheating:
temperature inside motor
too high
Check water and
ambient temperature
Over speed:
the pump rotor is driven
by an external ow above
the maximum allowed
value
Ensure that there is no
other external ow (other
pump running) on
system
Over current:
the stator winding is in
short circuit due to water
Check for leakage
application on
application
Overload of motor:
friction due to particles
and/or impeller blocked
with debris
Check installation water
quality, clean system if
debris
Blinks red Pump out of function Pump stopped (blocked) Blockage:
the pumps is fully
blocked due to debris in
system
Check for blockage.
Turn ON/OFF to reset
the pump by unplugging
the power supply
If the pumps still blinking
red after a power reset
then replace the pump
Faulty electronic module
and/or faulty motor
LED o
(Normal /
standby)
No power supply /
No demand to run
No voltage on electronics
(Turn on h/w tap, tap
running)
Pump is not connected to
power supply
Check PWM cable
connection
LED is damaged Check if pump is running
Electronics are damaged Replace pump
Check plumbing components
CW In line lter Isolate the CW mains supply at the servicing valve
Open HW taps to relieve the pressure
Undo securing nut ensuring that any remaining water is collected
Remove lter and clean it
The ow regulator can be checked at the same time by removing the upper pipe section.
Thermal store return
check valve + return
servicing valve
Isolate both servicing valves
Drain water from the section between the servicing valves
Remove the bottom pipe section
Check for free movement of the check valve incorporated in the body. Remove and replace if the check
valve sticks.

Page 38 Page 39
SERVICING AND MAINTENANCE SERVICING AND MAINTENANCE
FAULT FINDING SHORT PARTS LIST
Description Stock Code
1PHE pump - PWM XB065
2Plate heat exchanger - 24 plate (All non heat pump models) GT017
3Plate heat exchanger - 30 plate (Heat pump models only) GT027
4Pump isolating valve - outlet 1” GT133
514” Immersion heater - with stat SH003
6Main PCB controller - 1472H XB111
7Middle sensor GT198
8DHW inlet & outlet sensors GT198
9Ballvalve 1212 Part 2 FT206
10 Ballvalve oat FT429
11 Resetable overheat immersion stat XB081
12 Plastic feed and expansion tank XB343
13 22mm Blank FT311
14 28mm Blank FT466
15 Self resetting thermostat (store/control) XC010
16 90 degree isolating elbow (150 litre only) GT135A
17 Manual reset overheat thermostat XC011
18 Copper F&E for solid fuel (Bespoke manufacture, contact local Gledhill depot) n/a
19 Scale inhibitor XB153
20 Flow sensor XB095
21 90 degree isolation valve (all except 150 litre) GT135
Check
plumbing
TS full
of water?
Water
mains on?
PHE pipework
air locked?
Check
sensors
Overheat link
present in J7
Sensors plugged
in securely?
Sensors providing
correct signal to PCB?
Check Electrical
supply
Electrically
safe?
Components
short circuited?
Wiring as per
circuit diagram?
Pump LED
on?
N
Check cable connecn secure and
resistance in cable Pump running? LED is damaged pump replacement opnal
OK? Y
Resolve
N
Electronics damaged replace pump
LED Blinks red?
Y
Y Check for blockage in pipework
or pump housing
N
LED
connues to Blink red aer power
reset
Y Motor or Electronics damaged replace pump
OK?
OK? OK? OK?
OK? OK? OK?
Wiring as per circuit diagram
& polarity correct?
OK?
OK? Sensorsin
correct locan?
OK? OK? OK?
N
OK?
OK?
LED Blinks red &
green?
Resolve
OK?
Under voltage U<160 V or
Over voltage U>253 V
Resolve
OK? Pump overheang: Check water
and ambient temperatures
Resolve
Pump Over speed Ensure that there
is no other external w (other pump running) on system
OK?
Resolve
Over current the stator winding is in short circuit due to water. Check
for leak
OK?
Resolve
Over load of motor: fricn due to
parcles or impellor blocked. Clean debris from system
Note pump will restart by itself when the fault disappears OK?
Resolve
LED solid green? Normal stopped: pump in standby
Normal running: pump runs according to PWM signal and the LED will be constantly on
N
Y
Check board output to
pump
Check
power output to pump J8 L(10),
N(8), E(6)
Check
PWM frequency
Check
Duty Cycle
Y
Board
electronics
damaged
N
Sophiscated
mulmeter
available
Y
N
OK?
OK?
N
N