gledhill Torrent GreenHeat TGH140-OV User guide

Design, Installation & Servicing Instructions
Models covered in this manual
Torrent GreenHeat OV TGH140-TGH350
Torrent GreenHeat SP TGH140-TGH350
Torrent GreenHeat SOL TGH210-TGH450
Torrent GreenHeat HP TGH170-TGH450
Torrent GreenHeat HPSOL TGH210-TGH450
Torrent GreenHeat
Open vented thermal store providing heating and mains pressure hot water

Page 2
Section Page
DESIGN
Description 3
Technical Information 6
System Design 10
INSTALLATION
Installation 14
Wiring Diagrams 27
Commissioning 38
SERVICING AND MAINTENANCE
Servicing and Maintenance 40
Fault Finding 41
Short Parts List 45
APPENDIX
Appendix A 46
Appendix B 47
BENCHMARK
Commissioning Check List 48
Service Record 49
Terms & Conditions 50
ISSUE 1:MARCH 2013
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 defined 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 notifiable to building control unless it is
carried out under an approved competent person self-certification scheme.
Althoughthesecondarysupply (domestic)is atmains pressure,it isnot necessaryto
fitanexpansionchamber,pressureortemperaturereliefvalve,theplumbingshould
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,sensoryormental capabilities, or lack ofexperienceandknowledge 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.
Responsibilityforselectionandspecificationofourequipmentmusthoweverremain
thatofourcustomerandanyexpertsorconsultantsconcernedwiththeinstallation(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.
AllgoodsaresoldsubjecttoourConditionsofSalewhicharesetoutattherearofthis
specification. In the interest of continuously improving the Torrent range, Gledhill
BuildingProductsLimitedreservetherighttomodifytheproductwithoutnotice,and
inthesecircumstances thisbooklet,which isaccurateat the timeofprinting, 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
manufacturersinstructionsbycompetentpersonsandthatitmeetstherequirements
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.

Page 3
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
Immersion heater rating 3kW@230Vac,50Hz
The Torrent has 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
TheTorrent 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
canbemovedusing a sacktruckon therearfacealthoughcare shouldbetakenand
therouteshould beeven.Inapartment buildingscontaininganumberofstoreyswe
would recommend that the appliances are moved vertically in a mechanical lift.If it
isproposedto use acrane,expert advice should beobtainedregarding the needfor
slings,liftingbeamsetc. AspecificmanualhandlingassessmentisshowninAppendix
B at the rear of this manual.
Maintenance
Modifications 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 theTorrent.
Note:
Thecylinderisfactoryfittedwithimmersionheaterswiththermalcutouts.Immersions
without thermal cut outs must not be fitted.
DESIGN
DESCRIPTION

Page 4
DESIGN
DESCRIPTION
g) Less controls – The thermal store is open
vented and therefore does not require
additionalsafetydevicessuchastemperature
andpressurerelief valvesor aninlet control
group and expansion vessels.
h) Building Regulation – The thermal store,
beingopenvented,doesnotrequireBuilding
controltobenotifiedtocomplywithsection
G3 of the building regulations, unlike an
unvented cylinder which does.
i) Annualinspection–Therunningcostsofthis
cylinder are greatly reduced by not being
requiredtohaveanannualsafetyinspection
where as an unvented cylinder does.
TheTorrent provides high performance mains
pressurehotwaterwithouttheadditionalcosts
incurred with an unvented cylinder.
The Torrent GreenHeat is available in the
following basic variants:-
Torrent GreenHeat OV
The Torrent GreenHeat OV utilises an open
ventedboilerand/ordirectelectricimmersion
heaters as its primary energy source. It comes
fitted with tappings for a woodburning or
solidfuelboilerasstandard,butifnotrequired,
can be removed at the time of order.
One of the benefits of the open vented boiler
configuration is that the whole output of
the boiler is available to the thermal store,
unlike the indirect Sealed Primary (SP) version
where the output from the boiler is limited
by the heat exchanger. This will provide an
improvement in the operational efficiency of
the boiler,reducing the primary energy usage
and running costs.
The Torrent GreenHeat OV provides high-
performance mains pressure hot water. The
heat energy provided from the primary heat
source and / or solid fuel input is circulated
from the store to the central heating circuit,
allowing rapid heat-up of a radiator system.
In situations where no gas or solid fuel source
is available the Torrent GreenHeat OV can be
used exclusively from the two 3kW electric
immersion elements which will provide both
hotwaterandauxiliaryheatingfortheproperty.
The obvious application is apartments where
no gas main is available but this could also be
appropriate where electricity is available from
a renewable or low carbon source.
If connected to the standard grid then the
thermal store is the perfect solution to
maximise usage of an off peak tariff where
Gledhilldevelopedtheprincipalofdomesticthermalstoresstartingin1982and
they have been manufacturing them since then.
Their importance to plumbing systems is described below.
a) Why use a thermal store - Alternative energy fuel sources are typically low grade,
inherentlyunpredictable andare oftenavailableinplentifulsupplybutnotwhen
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.
Beingopenvented,theyprovideasimpleandinherentlysafewaytoproducehigh-
performance mains pressure hot water.So the householder can enjoy the comfort
andluxury ofamains pressuresystemproducedfromalternativeenergysources.
The alternative energy feeds into the thermal store which is also the water that
circulates around the heating system.This means that the energy available from
solarpanels or awoodburningstove,forexample,canbeused toprovideenergy
into the heating circuit to decrease the use of fossil fuel based boilers,and hence
reduce household running costs.
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 heart of an alternative energy system - The Torrent GreenHeat 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
• ground or air source heat pumps
• electricity from renewable or low carbon sources
If the system is configured appropriately the heat from the alternative energy
sourcewill be availableforboth hot waterANDheating.This isonlypossible with
a thermal store such as theTorrent and is not possible with an unvented cylinder
where you will only get an alternative energy contribution to the hot water.
c) In-built upgrade potential - You are able to specify from the required tappings,
with any future requirements,for example,a wood burning stove or solar panels
can be added as an upgrade to the property at a later stage and the hot water
cylinder will be ready to work with it.
d) NeutralPoint-TheTorrentGreenHeatbecomestheneutralpointinanyopenvented
systembecausetheopenventandcoldfeedpipesareconnectedtoit.Thebenefit
ofthisisthatanotherdevicetoenabledifferentsystemstobejoinedtogetherata
neutralpointisnotrequired,whichwouldberequiredinothersystems.Inmultiple
fuel systems,theTorrent acts as a low loss header.
e) Apartments–TheTorrentopenventedthermalstoredoesnotneedadischargepipe
fromapressureandtemperaturereliefvalve,unlikeanunventedcylinderwhichdoes.
ThiscombinedwiththefactthatdischargesarenotpermittedintoPVCusoilstacks
makestheinstallation of un-ventedstoresinapartments difficultandexpensive.
f) Legionella Risk – Alternative energy supplies cannot be relied upon to raise the
temperature of the stored water above 55 every time they operate.This is not a
problemwithathermalstorebecausethestorewaterisnotthewaterthatcomes
outofthetap.Thewaterthatcomesoutthehottapismainscoldwaterrunthrough
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.

Page 5
DESIGN
DESCRIPTION
arrangements should be made to power the lower immersion element in order to
minimise the running costs.It is important to note that the design heat loss,of the
rooms to be heated, must be less than the lowest immersion power. If the design
heat loss is greater than this,the heating will need to be supplemented by another
heat source.
TheTorrentGreenHeatOVisdesignedtobeheateddirectly(i.e.withoutinternalheat
exchangers) by one or more of the following heat sources;
• Electric immersion heaters e.g.to utilise off peak electricity
• A remote gas or oil boiler
• A solid fuel boiler or stove
Torrent GreenHeat SP
TheTorrentGreenHeatSPutilisesasealedsystemboilerasitsprimaryenergysource.
It comes fitted with tappings for a woodburning or solid fuel boiler as standard,
but if not required,can be removed at the time of order. TheTorrent GreenHeat SP
provides high-performance mains pressure hot water.
The central heating circuit is normally supplied directly from the boiler although an
auxiliary heating circuit can be connected from the store in which case the solid
fuelsourcewill provide energy totheauxiliary heating circuit.Obviously,the energy
output that can be provided by the auxiliary heating circuit will be limited to the
energy input from the solid fuel appliance.
Thissealed primary(SP) model permitstheuse ofasmaller feedand expansiontank
because the main central heating circuit does not need to be catered for.This can
make positioning the F&E tank more straightforward.
Animmersionelementisprovidedandit isnormally envisagedthatthis willbe used
asanemergencyelectricback-upforhotwaterandtoprovideemergencyenergyto
theauxiliary heating circuit.However,ifalowcarbon or renewableelectricity source
is available then this could be connected to the immersion element to provide heat
input to the thermal store, decreasing the use of the fossil fuel boiler and hence
reducing running costs.
TheTorrent GreenHeat SP is designed to be heated by one or more of the following
heat sources;
• Directly by an electric immersion heater as a backup heat source only
• Indirectly (i.e.via a heat exchanger) by a remote gas or oil boiler
• Directly by a solid fuel boiler or stove
Torrent GreenHeat SOL
The Torrent GreenHeat SOL utilises either a sealed system boiler and / or an open
vented boiler as its primary energy source.It also has a high-efficiency solar coil to
allow the homeowner to benefit from a wide variety of alternative energy inputs.
The cylinder comes fitted with tappings for a woodburning or solid fuel boiler as
standard,but if not required,can be removed at the time of order.
TheTorrent GreenHeat SOL provides high-performance mains pressure hot water.The
central heating circuit can be supplied directly from a sealed system boiler although
an auxiliary heating circuit can be connected from the store in which case both the
solar and solid fuel energy will also provide an input to the auxiliary heating circuit.
Alternatively,an open vented boiler can be used to directly heat the store so that the
energywill be availableforboth hot waterand auxiliarycentralheating circuit.
The cylinder comes with two return connections for solid fuel and woodburning
stoves to enable the homeowner to have an aga running 24 hours a day but still
retaining the dedicated solar volume.
Animmersionelementisprovidedandit isnormally envisagedthatthis willbe used
as an emergency electric back-up for hot water and to provide emergency energy
to the auxiliary heating circuit. However, if a
low carbon or renewable electricity source is
available then this could be connected to the
immersion element to provide heat input to
the thermal store, decreasing the use of the
fossil fuel boiler and hence reducing running
costs.
The Torrent GreenHeat SOL is designed to be
heated by one or more of the following heat
sources;
• Directly by an electric immersion heater as
a backup heat source only
• Either indirectly or directly by a remote gas
or oil boiler
• Directly by a solid fuel boiler or stove
• Indirectly by solar thermal system
Torrent GreenHeat HP Models
The Torrent GreenHeat HP and HP SOL are
directly heated, open vented thermal stores
designedforusewithanairsourceoraground
sourceheatpump.Itcomesfittedwithtappings
for a woodburning or solid fuel boiler as
standard, but if not required,can be removed
at the time of order.
Although the thermal store is open vented,
the mains pressure hot water is heated
instantaneously via the plate heat exchanger.
The Torrent GreenHeat HP range of primary
thermal stores are only suitable for open
ventedheatingsystemsbuttheyprovidemains
pressurehotwaterwithouttherequirementsof
a pressure and temperature relief valve.
Thesuggestedmodelsizesarebasedontypical
hotwaterusageandthestorechargedtoabout
75°C. If the store charge temperature is going
to be lower, then a larger model should be
considered.This is especially important where
the heat pump alone is unable to charge the
store to 75°C as is likely to be the case with a
heat pump.If the immersion element is used
to raise the temperature of the store, then
a suitable control system should be used
to ensure the immersion element does not
operateuntiltheheatpumphasraisedthestore
to the maximum temperature, or the overall
efficiency of the system will be reduced.
The Torrent GreenHeat HP and HP SOL is
designed to be heated by one or more of the
following heat sources;
• Directlybyagroundsourceorairsourceheat
pump
• Directly by an electric immersion heater as
a backup heat source only
• Directly by a solid fuel boiler or stove
• Indirectly by solar thermal system

Page 6
Technical
Model
Weight - Empty
Weight - Full
Domestic HotWater Volume
Overall Height
(Excluding F&ETank)
Overall Diameter
Domestic HotWater
From Plate Heat Exchanger
Solar Sensor
Store Overheat
Domestic HotWater
Store Sensor
Solid Fuel Flow
OpenVented Boiler Flow
Central Heating Flow
On Peak
Backup Immersion Heater
Sealed Primary Boiler Flow
Control Stat
kg kg litres A
mm mm B mm C mm D mm E mm F mm G mm H mm I mm J mm K mm
Torrent
GreenHeat OV
TGH140-OV 37 171 140 1219 535 490 n/a 1040 1040 545 545 505 570 n/a 395
TGH170-OV 39 202 170 1449 535 720 n/a 1270 1270 670 670 630 685 n/a 470
TGH210-OV 41 242 210 1414 585 680 n/a 1235 1235 685 685 645 690 n/a 455
TGH250-OV 43 282 250 1654 585 925 n/a 1475 1475 785 785 745 790 n/a 540
TGH350-OV 53 388 350 1874 636 1140 n/a 1690 1690 890 890 850 895 n/a 615
Torrent
GreenHeat SP
TGH140-SP 42 176 140 1219 535 490 n/a 1040 1040 545 n/a 505 495 322 395
TGH170-SP 44 207 170 1449 535 720 n/a 1270 1270 690 n/a 650 570 322 470
TGH210-SP 47 248 210 1414 585 680 n/a 1235 1235 685 n/a 645 555 412 455
TGH250-SP 49 288 250 1654 585 925 n/a 1475 1475 785 n/a 745 640 432 540
TGH350-SP 61 396 350 1874 636 1140 n/a 1690 1690 890 n/a 850 480 350 615
Torrent
GreenHeat SOL
TGH210-SOL 49 250 210 1414 585 680 920 1235 1235 845 845 805 455 702 705
TGH250-SOL 51 290 250 1654 585 925 1085 1475 1475 1005 1005 965 545 872 830
TGH350-SOL 63 398 350 1874 636 1140 1255 1690 1690 1010 1010 970 590 850 950
TGH450-SOL 68 499 450 1764 738 935 1185 1490 1490 1060 1060 1020
640 895 900
DESIGN
TECHNICAL INFORMATION
Torrent GreenHeat OV
G
H
K
U
Z
D
I
Q
F
B
X
A
Y
E
S
N
P
T
Torrent GreenHeat SP
H
I
J
Z
D
F
Q
B
X
A
Y
E
S
L
N
T
K

Page 7
Sealed Primary Boiler Return
Solid Fuel Return
(Solar Model Only)
Central Heating Return
OpenVented Boiler return
Cold MainsTo
Plate Heat Exchanger
Solar Sensor
Plate Heat Exchanger Return
(Incorporating Drain)
Solid Fuel return
Off Peak Immersion Heater
Solar Flow
Solar return
Cold Feed
Plate Heat Exchanger Flow
OpenVent
Surface Area of
Primary Heater Coil
Surface Area of
Solar Heater Coil
Capacity (TotalVolume)
Standing Losses kWhr/24hr
Dedicated SolarVolume
Maximum HotWater Flow Rate
L
mm M mm N mm P mm Q mm R mm S mm T mm U mm V mm W mm X mm Y mm Z mm m2m2litres kWh litres litres/
min
n/a n/a 135 95 155 n/a 95 95 185 n/a n/a 195 1040 1115 n/a n/a 134 1.81 n/a 35
n/a n/a 135 95 385 n/a 95 95 185 n/a n/a 195 1270 1345 n/a n/a 163 2.03 n/a 35
n/a n/a 135 95 345 n/a 95 95 185 n/a n/a 195 1235 1310 n/a n/a 201 2.30 n/a 35
n/a n/a 135 95 590 n/a 95 95 185 n/a n/a 195 1475 1550 n/a n/a 239 2.56 n/a 35
n/a n/a 140 100 805 n/a 100 100 190 n/a n/a 200 1690 1770 n/a n/a 334 3.14 n/a 2x35
145 n/a 135 n/a 155 n/a 95 95 n/a n/a n/a 195 1040 1115 1.38 n/a 134 1.81 n/a 35
145 n/a 135 n/a 385 n/a 95 95 n/a n/a n/a 195 1270 1345 1.38 n/a 163 2.03 n/a 35
145 n/a 125 n/a 345 n/a 95 95 n/a n/a n/a 195 1235 1310 1.84 n/a 201 2.30 n/a 35
165 n/a 125 n/a 590 n/a 95 95 n/a n/a n/a 195 1475 1550 1.84 n/a 239 2.56 n/a 35
150 n/a 140 n/a 805 n/a 100 100 n/a n/a n/a 200 1690 1770 2.28 n/a 334 3.14 n/a 2x35
525 95 475 435 345 190 95 435 n/a 355 125 195 1235 1310 1.84 0.27 201 2.30 60 35
605 95 545 505 590 220 95 505 n/a 410 125 195 1475 1550 1.84 0.34 239 2.56 71 35
650 100 610 570 805 225 100 570 n/a 475 130 200 1690 1770 2.28 0.40 334 3.14 100 2x35
695 270 640 590 600 310 390 590 n/a 360 260 370 1490 1785 2.28 0.54 431 3.67 128 2x35
DESIGN
TECHNICAL INFORMATION
K
Torrent GreenHeat SOL
J
L
N
P
V
R
Z
D
G
H
Q
B
I
X
M
A
F
Y
E
C
S
W
T
NOTES
1. The diagrams shown are generic.
For exact product specification
refer to the table eg. the number
of immersion heaters varies
depending on model.
2. The specifications shown are the
standard range, but these can be
changedatthetimeofordertosuit
specific installation requirements.
3. All connections are within 145˚,
butifmoredetailisrequired,please
contact our technical desk on
01253474584oryourlocalGledhill
depot.

Page 8
Technical
Model
Weight - Empty
Weight - Full
Domestic HotWater Volume
Overall Height
(Excluding F&ETank)
Overall Diameter
Domestic HotWater
From Plate Heat Exchanger
Solar Sensor
Store Overheat
Domestic HotWater
Store Sensor
Solid Fuel Flow
Central Heating Flow
Central Heating
Boost Immersion Heater
Second Central Heating
Boost Immersion Heater
Domestic HotWater
Backup Immersion Heater
Second Domestic HotWater
Backup Immersion Heater
Control Stat
kg kg litres A
mm mm B mm C mm D mm E mm F mm G mm H mm mm J mm mm L mm
Torrent
GreenHeat HP
TGH170-HP 37 171 170 1449 530 720 n/a 1270 1270 670 265 165 n/a 340 n/a 470
TGH210-HP 39 202 210 1414 580 680 n/a 1235 1235 665 255 160 n/a 325 n/a 455
TGH250-HP 41 242 250 1654 580 925 n/a 1475 1475 785 305 185 n/a 375 n/a 540
TGH350-HP 43 282 350 1874 630 1140 n/a 1690 1690 900 355 215 300 430 515 615
TGH450-HP 53 388 450 1764 730 935 n/a 1490 1490 880 390 310 395 510 595 630
Torrent
GreenHeat HP SOL
TGH210-HPSOL 49 250 210 1414 580 680 920 1235 1235 845 550 490 n/a 625 n/a 705
TGH250-HPSOL 51 290 250 1654 580 925 1085 1475 1475 1000 655 580 n/a 730 n/a 830
TGH350-HPSOL 63 398 350 1874 630 1140 1255 1690 1690 1150 760 660 745 835 920 950
TGH450-HPSOL 68 499 450 1764 730 935 1185 1490 1490 1100 755
670 750 830 910 900
DESIGN
TECHNICAL INFORMATION
Torrent GreenHeat HP
V
T
G
N
D
F
L
AA
J
W
H
E
B
P
R
X
U
S
BB A
CC

Page 9
Solid Fuel Return
(Solar Model Only)
Central Heating Return
Cold MainsTo
Plate Heat Exchanger
Solar Sensor
Plate Heat Exchanger Return
(Incorporating Drain)
Solid Fuel return
Heat Pump Flow
Heat Pump Return
Heat Pump Cylinder Sensor
Heat Pump Flow Sensor
Heat Pump Return Sensor
Solar Flow
Solar return
Cold Feed
Plate Heat Exchanger Flow
OpenVent
Surface Area of
Solar Heater Coil
Capacity (TotalVolume)
Standing Losses kWhr/24hr
Dedicated SolarVolume
Maximum HotWater Flow Rate
M
mm N mm P mm Q mm R mm S mm T mm U mm V mm W mm X mm Y mm Z mm AA mm BB mm CC mm m2litres kWh litres litres/ min
n/a 125 385 n/a 95 95 295 95 470 295 95 n/a n/a 195 1270 1345 n/a 163 2.03 n/a 15
n/a 125 345 n/a 95 95 285 95 455 285 95 n/a n/a 195 1235 1310 n/a 201 2.30 n/a 15
n/a 125 590 n/a 95 95 335 95 540 335 95 n/a n/a 195 1475 1550 n/a 239 2.56 n/a 15
n/a 130 805 n/a 100 100 385 100 615 385 100 n/a n/a 200 1690 1770 n/a 339 3.14 n/a 2x15
n/a 270 600 n/a 270 270 420 270 630 420 270 n/a n/a 370 1490 1785 n/a 431 3.67 n/a 2x15
95 465 345 190 95 435 580 435 705 580 435 355 125 195 1235 1310 0.27 201 2.30 60 15
95 535 590 220 95 505 685 505 830 685 505 410 125 195 1475 1550 0.34 239 2.56 71 15
100 600 805 225 100 570 790 570 950 790 570 475 130 200 1690 1770 0.40 334 3.14 100 2x15
270 620 600 310 390 590 785 590 900 785 590 360 260 370 1490 1785 0.54 431 3.67 128 2x15
DESIGN
TECHNICAL INFORMATION
NOTES
1. The diagrams shown are generic.
For exact product specification
refer to the table eg. the number
of immersion heaters varies
depending on model.
2. The specifications shown are the
standard range, but these can be
changedatthetimeofordertosuit
specific installation requirements.
3. All connections are within 145˚,
butifmoredetailisrequired,please
contact our technical desk on
01253474584oryourlocalGledhill
depot.
4. The domestic hot water volume
and maximum hot water flow
rate figures are based on the store
temperature being 75˚C.
J
Torrent GreenHeat HP SOL
V
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F
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P
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Y
S
A
B
BB
E
C
AA
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R

Page 10
Torrent GreenHeat OV
Basic Appliance
1. Open vent - 22mm comp
2. Overheat stat
3. Plate heat exchanger flow - 22mm
4. Domestic hot water store sensor
5. Immersionheater
6. Solid fuel flow - 28mm comp
7. Hot water supply - 22mm comp
8.
OVboilerflow-22mmcomp(350/450-28mmcomp)
9. Central heating flow - 22mm comp
10. Control stat
11. Cold mains supply - 22mm comp
12. Cold feed - 15mm comp
13. Immersion heater
14. Plate heat exchanger return - 22mm
15. Central heating return - 22mm comp
16.
OVboilerreturn-22mmcomp(350/450-28mmcomp)
17. Solid fuel return - 28mm comp
Component kit supplied attached
A. Thermostat
Optional extra components
A. Header tank
B. Ball valve
C. Float
D. Immersion heater
E. Overheat thermostat
Torrent GreenHeat SP
Basic Appliance
1. Open vent - 22mm comp
2. Overheat stat
3. Plate heat exchanger flow - 22mm
4. Domestic hot water store sensor
5. Solid fuel flow - 28mm comp
6. Hot water supply - 22mm comp
7. Central heating flow - 22mm comp
8. Immersion heater
9. Control stat
10.
SPcoilflow-22mmcomp(250/350-28mmcomp)
11. Cold mains supply - 22mm comp
12. Cold feed - 15mm comp
13.
SPcoilreturn-22mmcomp(250/350-28mmcomp)
14. Plate heat exchanger return - 22mm
15. Central heating return - 22mm comp
16. Solid fuel return - 28mm comp
Component kit supplied attached
A. Thermostat
Optional extra components
A. Header tank
B. Ball valve
C. Float
D. Immersion heater
E. Overheat thermostat
2
9
8
10
13
15
16 17
6
5
3
1
7
11
12
14
4
2
7
8
9
10
13
15
16
5
3
1
7
11
12
14
4
DESIGN
SYSTEM DESIGN
Typical arrangement of tappings shown on the appliance,but these can be
adjusted to suit specific installation requirements.
The feed and expansion tank must be sized to take the water expansion of the
whole system (i.e.solid fuel boiler,open vented boiler and auxiliary heating).

Page 11
Torrent GreenHeat SOL
Basic Appliance
1. Openvent-22mmcomp(450-28mmcomp)
2. Overheat stat
3. Plate heat exchanger flow - 22mm
4. Domestic hot water store sensor
5. Solar sensor
6. Solid fuel flow - 28mm comp
7. OVboilerflow-22mmcomp(350/450-28mmcomp
8. Central heating flow - 22mm comp
9. Control stat
10. SPcoilflow-28mmcomp(210-22mmcomp)
11. Hot water supply - 22mm comp
12. SPcoilreturn-28mmcomp(210-22mmcomp)
13. Central heating return - 22mm comp
14. Immersion heater
15. OVboilerreturn-22mmcomp(350/450-28mmcomp
16. Solid fuel return - 28mm comp
17. Cold mains supply - 22mm comp
18. Solarcoilflow-22mmcomp(450-28mmcomp)
19. Cold feed - 15mm comp
20. Solar sensor
21. Solarcoilreturn-22mmcomp(450-28mmcomp)
22. Plate heat exchanger return - 22mm
23. Solid fuel return 2 - 28mm comp
Component kit supplied attached
A. Thermostat
Optional extra components
A. Header tank
B. Ball valve
C. Float
D. Immersion heater
E. Overheat thermostat
2
8
7
10
13
20
21
23
12
15
16
3
1
11
17
14
19
18
5
6
9
22
4
DESIGN
SYSTEM DESIGN
Typical arrangement of tappings shown on the appliance,but these can be
adjusted to suit specific installation requirements.
The feed and expansion tank must be sized to take the water expansion of the
whole system (i.e.solid fuel boiler,open vented boiler and auxiliary heating).
Pleasenotethereare2solidfuelreturnpositionsonthesolarrangetoenablethewhole
storewatervolumetobeusedtostoreheatwhenthesolarcontributionisnegligible.
For example,a solid fuel boiler that is used for space heating would be used in the
wintermonthswhenthesolarcontributionissmall.Connectingittothelowerreturn
enables the store to hold more heat when the solar contribution is negligible.
AlternativelyanAgawhichruns24hours365daysayearwouldneedtobeconnected
to the upper return when the solar contribution is greatest and the lower when the
solarcontributionisleast.Thisallowsthesolartomakeacontributiontothestoreeven
thoughtheAgaisrunning24hoursaday.Amanual3-portdivertervalvemaybeused
toswitchfromsummertowintermodeormoresophisticatedcontrolmethodsused.
Thecontrolsshouldbefittedtomaximiseusefulenergygain:minimiseloss ofuseful
energyandensurethatback-upheatsourcesarenotusedwhenadequategradesolar
contribution is available.For precise guidance please refer to“table 37 section 6.0a
System controls”of the“Domestic building compliance guide 2010”.

Page 12
Torrent GreenHeat HP
Basic Appliance
1. Openvent-22mmcomp(450-28mmcomp)
2. Store overheat
3. Plate heat exchanger flow - 22mm
4. Domestic hot water store sensor
5. Hot water supply - 22mm comp
6. Solid fuel flow - 28mmcomp
7. Heat pump cylinder sensor
8. Control stat
9. Cold mains supply - 22mm comp
10. DHW backup immersion heater
11.
Heatpumpflow-28mmcomp(350/4501.25Fem)
12. Central heating flow -22mmcomp
13. Domestic hot water store sensor
14. Cold feed - 15mm comp
15. CH boost immersion heater
16. Central heating return - 22mmcomp
17. Heat pump return sensor
18.
Heatpumpreturn-28mmcomp(350/4501.25Fem)
19. Solid fuel return - 28mmcomp
20. Plate heat exchanger return - 22mm
Component kit supplied attached
A. Thermostat
Optional extra components
A. Header tank
B. Ball valve
C. Float
D. Immersion heater
E. Overheat thermostat
Torrent GreenHeat HP SOL
Basic Appliance
1. Openvent-22mmcomp(450-28mmcomp)
2. Overheat stat
3. Plate heat exchanger flow - 22mm
4. Domestic hot water store sensor
5. Solar sensor
6. Solid fuel flow - 28mmcomp
7. Heat pump cylinder sensor
8. Control stat
9. Hot water supply - 22mm comp
10. DHW backup immersion heater
11. Heat pump flow sensor
12.
Heatpumpflow-28mmcomp(350/4501.25Fem)
13. Central heating flow -22mmcomp
14. CH boost immersion heater
15. Central heating return - 22mmcomp
16. Heat pump return sensor
17.
Heatpumpreturn-28mmcomp(350/4501.25Fem)
18. Solid fuel return - 28mmcomp
19.
Solarcoilflow-22mmcomp(450-28mmcomp)
20. Cold mains supply - 22mm comp
21. Solar sensor
22. Cold feed - 15mm comp
23.
Solarcoilreturn-22mmcomp(450-28mmcomp)
24. Solid fuel return - 28mmcomp
25. Plate heat exchanger return - 22mm
Component kit supplied attached
A. Thermostat
Optional extra components
A. Header tank
B. Ball valve
C. Float
D. Immersion heater
E. Overheat thermostat
2
6
8
7
12
13
11
16
18
17 19
3
1
5
10
9
14
15
20
4
2
6
8
7
13
15
16
17
19
12
23
24
3
5
1
9
10
14
18
11
20
22
21
25
4
DESIGN
SYSTEM DESIGN
Typical arrangement of tappings shown on the appliance,but these can be
adjusted to suit specific installation requirements.
The feed and expansion tank must be sized to take the water expansion of the
whole system (i.e.solid fuel boiler,open vented boiler and auxiliary heating).

Page 13
DESIGN
SYSTEM DESIGN
General
• AllTorrentGreenHeatHPmodelscoveredbythismanual,areonlysuitableforopen
vented primary (heat pump and space heating) circuits. Therefore the pressure
inthe primarycircuitdepends uponthe heightofthe feedand expansioncistern
and could be as low as 0.20 bar. Therefore ensure that the heat pump selected
will operate at primary circuit pressures e.g. it is not fitted with a non-adjustable
low system pressure switch.
• The heat pumps normally operate at lower temperature difference (5-10°C)
betweenflowandreturnthanthatforagasboilers(10-20°C)resultinginhigherflow
rates in the heat pump primary circuit. Therefore it is important that the primary
pipeworkconnectingtheheatpumptothethermalstoreandthecirculatingpump
are sized to achieve flow rates recommended by the heat pump manufacturer.
• The efficiency (i.e. coefficient of performance, COP) of a heat pump depends
upontheprimaryflowandreturntemperaturesanditisgenerallyhigheratlower
primarycircuittemperatures.Alsotheheatpumpsnormallyoperateatlowerflow
temperatures;typically45-55°Ccomparedwith75-80°Cforgasboilers.Thereforeif
traditionalradiators are usedthen,these shouldbeoversized in accordancewith
the heat pump manufacturers recommendations.
• Foroptimumoperationalefficiencyandhencelowerrunningcosts,alowtemperature
space heating (e.g.under-floor heating) system shouldbe used where feasible.
Hot water performance of TGH210HP at 15 - 17 l/min draw off rate
Draw-off volume (litres)
Hot water temperature °C
0
10
20
30
40
50
60
0
12.5
25
37.5
50
62.5
75
87.5
100
112.5
125
137.5
150
162.5
175
187.5
200
HW Outlet (55) (°C)
HW Outlet(75) (°C) HW Outlet (65) (°C) AVG CW Inlet Temp (°C)
The draw off volume figures shown above are for the TGH210 HP store.These are
increased accordingly as the cylinder capacity increases.The graph illustrates the
increase in volume that can be achieved by the use of the auxiliary heat source.
A15-17litre/minflowrestrictorisfittedtotheTorrentGreenHeatHPhotwatersupply
outletoncommissioning.Checkthatthehotwaterflowdoesnotexceed17litre/min.
Particular attention needs to be paid to the product size selection.If the
intention is for the majority of the hot water to be provided by the heat
pumpwithminimaluseoftheauxiliaryimmersionelementthenitmaybe
necessary to choose a larger store.
Heat Pump Sizing
• Theefficiency(i.e.coefficientofperformance,
COP)of anair sourceheat pumpandhence
its heat output generally decreases as
the ambient air temperature decreases.
Therefore, this factor should be taken into
accountwhensizingandselectingtheheat
pump.
• Thedesignspaceheatingloadofadwelling
should be calculated in accordance with
BS 5449. The allowance for domestic hot
water heating (shown in table below),
depends upon the operating mode. For
example,ifthesystemisdesignedtooperate
with priority for domestic hot water, then
no additional allowance for hot water is
required for sizing the heat pump.
Allowance for Domestic HotWater
Heating
Torrent
Model
Allowance for Domestic
HotWater
HotWater
Priority
Mode
Flow Share
Mode
180 HP-SOL 0kW 1.5kW
180 HP
210 HP-SOL 0kW 2.5kW
210 HP
250 HP-SOL 0kW 3.0kW
250 HP
300 HP-SOL 0kW 3.5kW
350 HP
450 HP-SOL 0kW 4.0kW
450 HP-SOL 0kW 5.0kW

Page 14
Model Selection
The suggested model sizes shown in the tables
opposite are based on a typical daily hot water
usageandon theassumptionsthat the heating
system is correctly sized and that the thermal
storeisfullychargedtoatleast75°Cbythemain
heat source.
When selecting a solar model, it is important
to check the dedicated solar volume (shown in
table on pages 6-7) complies with the Building
Regulations ADL1 Domestic Building Services
ComplianceGuide.
The suggested model sizes are based on
typical hot water usage. For high specification
dwellings an increase of one model size should
be considered.
General Design Considerations
As a general rule,the cupboard footprint needs
tobeaminimumof150mmwider,80mmdeeper
and 80mm taller than the unit selected.
ThebasechosenfortheTorrentshouldbeleveland
capableofsupportingtheweightoftheunitwhen
fullofwaterasshownin GeneralData.
General Restrictions
a. An ascending spray type bidet or any other
appliance with a Class 1 back-syphonage
riskrequiringatypeAairgapshouldnotbe
used.
b. Torrent should not be used where steam is
the primary heating medium.
Torrent GreenHeat OV Model Selection Guide
Max hot water demand Bedrooms Model
1 bathroom 1 - 2 TGH140-OV
1 bathroom + en-suite shower 2 - 4 TGH170-OV
2 bathrooms + en-suite shower 3 - 4 TGH210-OV
2 bathrooms + 2 en-suite showers 3 - 5 TGH250-OV
3 bathrooms + 2 en-suite showers 3 - 5 TGH350-OV
Torrent GreenHeat SP Model Selection Guide
Max hot water demand Bedrooms Model
1 bathroom 1 - 2 TGH140-SP
1 bathroom + en-suite shower 2 - 4 TGH170-SP
2 bathrooms + en-suite shower 3 - 4 TGH210-SP
2 bathrooms + 2 en-suite showers 3 - 5 TGH250-SP
3 bathrooms + 2 en-suite showers 3 - 5 TGH350-SP
Torrent GreenHeat HP Model Selection Guide
Max hot water demand Bedrooms Model
1 bathroom + en-suite shower 2 - 3 TGH170-HP
1 bathroom + 2 en-suite showers 2 - 3 TGH210-HP
2 bathrooms + en-suite shower 3 - 4 TGH250-HP
2 bathrooms + 2 en-suite showers 3 - 4 TGH350-HP
3 bathrooms + 2 en-suite showers 4 - 5 TGH450-HP
Torrent GreenHeat SOL Model Selection Guide
Max hot water demand Max solar collector
area (m2)Bedrooms Model
1 bathroom + en-suite shower 2.40 2 - 4 TGH210-SOL
2 bathrooms + en-suite shower 2.84 2 - 4 TGH250-SOL
2 bathrooms + 2 en-suite showers 4.00 3 - 5 TGH350-SOL
3 bathrooms + 2 en-suite showers 5.12 4 - 6 TGH450-SOL
Torrent GreenHeat HP-SOL Model Selection Guide
Max hot water demand Max solar collector
area (m2)Bedrooms Model
1 bathroom + en-suite shower 2.40 2 - 3 TGH210-HPSOL
1 bathroom + 2 en-suite showers 2.84 2 - 3 TGH250-HPSOL
2 bathrooms + 1 en-suite shower 4.00 3 - 4 TGH350-HPSOL
2 bathrooms + 2 en-suite showers 5.12 3 - 4 TGH450-HPSOL
INSTALLATION
INSTALLATION

Page 15
MainsWater Supply
A typical arrangement of the hot and cold water system is shown below.AllTorrent
modelsaredesignedtobefeddirectlyfromthemainsandtheyfulfiltherequirements
ofWaterBylaw91,and thereforedo not requireacheck valveto befittedto the cold
water supply pipe.
TheperformanceoftheTorrentisdirectlyrelatedtothecoldwatersupplypressureand
volumetothedwelling.Thismustbecapableofprovidingforallthoseserviceswhich
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 sufficient for the
smallerdwellingwith onebathroom,a22mmserviceispreferred(25mmMDPE)and
should be the minimum for larger dwellings.
TheTorrentwilloperateatdynamicpressureaslowas1.5bar(attheappliance)which
mustbe availablewhen thelocal demandis atits maximum,butthepreferredrange
is between 2 and 3.0 bar.
Iftheincomingstaticmainspressureexceeds5.0baratanypointinthe24hourcycle,
thenapressurelimiting valvesetat3.0barshouldbe fitted downstream of thestop
tap where the cold supply enters the dwelling.
If a water meter is fitted in the service pipe,it should have nominal rating to match
the anticipated maximum simultaneous hot and coldwater demand, calculated in
accordance with BS 6700.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 LocalWater Undertaking and the relevantWater Bylaws.
Taps and Shower Fittings
Aerated taps are recommended to prevent
splashing.
All types of shower mixing valves can be used
aslongasbothhotandcoldsuppliesaremains
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
recommendthermostaticshowerswithTorrent.
Theshowerheadprovidedmustalsobesuitable
for mains pressure supplies.
The hot water supply to a shower-mixing
valve should be fed where practical directly
from the Torrent or be the first draw-off 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 fitted with
the necessary check valves to prevent back-
syphonageprotectioninaccordancewithWater
Regulations.
Thesupplyofhotandcoldmainswaterdirectly
to the bidet is permitted provided that it is of
the over-rim flushing type and that type‘A’air
gap is incorporated.
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

Page 16
Pipe Layout
Inallmainspressureinstallationsitisimportanttorememberthattheincomingcold
supplymustbesharedbetweenallterminalfittings. Itisimportantthata22mmsupply
is brought to the appliance and a 22mm take-off is continued at least to the bath. If
there are two baths, 28mm pipework should be considered. One metre of smaller
diameterpipework,orflowrestrictors,shouldbeprovidedonthefinalconnectionto
alloutletssoastobalancethewateravailable. Inanyeventthedistributionpipework
should generally be in accordance with EN806:1.
Plastic Pipework
All the recommendations with regard to the heating systems in this manual are
generally based on BS/EN Standard copper pipework and fittings. 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
manufacturersanditis installed fully inaccordancewith theirrecommendations.
b. ThedesigncriterionoftheplasticsystemisatleastequivalenttotheuseofBS/EN
Standard copper pipework and fittings.
c. Barrier pipework for these systems is recommended.
BallValve and Overflow
The feed and expansion tank can be filled manually if required e.g.using a hose pipe
fitted with a double check valve.
Inthissituationanoverflowpipecanstillbefittedifrequiredtoensurethatifaleakoccurs
on the plate heat exchanger it can be discharged safely to the outside of the building.
Note:If a ball valve is fitted,then a warning/overflow pipe must always be fitted.
Thefeedandexpansiontank(providedbytheinstaller)mustbesizedcorrectlytoenable
the expansion of the entire system volume.This will include the central heating,store,
solid fuel and boiler circuit volumes.
See page 14 for guidance sizing the feed and expansion tank.
Water Treatment
InallTorrentmodels,the primary(i.e.non-potable)waterisstoredand thedomestic
hotwaterisheatedinstantaneouslybymeansofheatexchangers.Thereforetreating
the primary water will not contaminate the domestic hot water supply.
Although the Torrent primary store has no special water treatment requirements, the
radiatorsandotherpartsofthecircuitwillrequiretheapplicationofascaleandcorrosion
inhibitor. Thevolumesandconcentrationshouldbecalculatedinaccordancewiththe
manufacturers instructions and when calculating the system volume (i.e. the water
content), the volumeof the Torrent shouldbe taken into account.
Use In Hard Water Areas And Scale Protection
The patented design of the domestic hot water heat exchanger is such that the
turbulencethroughthecoilslowsdowntheformationofscaleinmoderatehardwater
conditions. However, the requirements set out in the ‘Domestic Building Services
ComplianceGuide’andthe Building Regulations approved documents L1AandL1B
regarding scale protection should be complied with.
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
INSTALLATION
INSTALLATION
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
suitablein-linescaleinhibitordeviceshould
specified 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 specified and fitted at
a suitable point in the cold water supply to
the appliance.
It is important that where the supply to the
Torrent is in 22mm the in-line scale inhibitor
is also 22mm. In practice servicing is not
normally required but in hard water areas, the
requirementscanbeconsideredsimilartothose
neededforinstantaneousor‘combi’appliances.
The installation of scale inhibitor should be in
accordancewiththemanufacturersinstructions
and Water Byelaws.
London Loop
As the thermal store gets hot the water will
expand and the water level in the R&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
cylinderbecomeshotteritmayrunoutthecold
feedconnectionpipe.Ifthecoldfeedpipethen
runsverticallyitworkslikechimneywiththehot
water rising to the top in the same way hot air
does from a fire. If this section is not insulated
then it will lose heat and waste energy.
If, however, the cold feed is formed into a
sheppard’s crook or london loop it will form a
thermaltrap.Athermaltrapworksbyensuring
thatcoldwaterisheldbelowhotwater.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.
Theminimumdepthof theU trapis calculated
by multiplying the pipe diameter by 8. For
example;
• Using 15mm pipework will require a
minimum of 120mm
• Using 22mm pipework will require a
minimum of 176mm
Theuseof22mmpipeworkwillenablequicker
filling on initial installation.

Page 17
Immersion Heaters
These are 3kW 240V AC heaters and incorporate a thermostat. The thermostat
incorporatinga‘singleshot’overheatenergycut outwhichmeans it cannotbereset
andmustbereplacedifithasoperated.Theyhaveincalloyelementstoprolongtheir
life expectancy in aggressive water conditions.
Thecorrectmethodofconnectingthewiringtotheimmersionheaterisshownopposite.
Utilising Off Peak Electricity
Whereitisintended that units are fitted tooffpeakcircuits,then suitable controllers
such as the Horstmann off 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 fuse and a double pole
isolating switch.
INSTALLATION
INSTALLATION
Thermostat
Immersion HeaterWiring
E
L
N
N E L1
T1
C5
C4
C1: Store sensor – S6
C2: CW inlet – S3
C3: DHW outlet – S4
To PHE modulating pump
Grundfos UPR 15-50
Mains supply
230Vac, 50Hz, 500w
Fuse rating: 3A
Anti-scaling coil
G1
G2 G3
G4
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.
WiringThe Control Panel
The control panel requires a separate 3 amp
fuse spur double pole to ensure safe isolation.
Thecable/flexfromthefusespurtothecontrol
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
blackscrews.Removetheseandliftoffthefront
covertoexposethepowerterminals.Theseare
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 theWAGO connector.This opens the
clampandtheneutral wire can befedinto the
connector.Removethescrewdriverandtestthe
wire is securely fit.Repeat with the PE and live
cables.Tighten the cable gland and check for
security. Perform the necessary safety checks
and refit the front panel.
Important
Theunitmustnotbepoweredupunlessthe
thermalstorehasbeenfilledwithwaterand
the pump has been bled.

Page 18
INSTALLATION
INSTALLATION
Boiler Size
Theminimumtotalboilerpowerrequiredisthe
sum of the power required for space heating
whichshouldbecalculatedinaccordancewith
BS5449 andthepowerrequiredforproducing
hot water which can be read from the table to
the left.
ExpansionVesselForSealedHeatingSystem
The table opposite can be used for sizing the
heating system expansion vessel.The water
contentof theTorrentprimary heatexchanger
is listed in specification tables on pages 6
and 7 and a figure of 4.5 l/kW of installed
radiatorcapacity can be usedfora preliminary
assessmentofthewatercontentoftheheating
system.
The expansion vessel requirements shown in
the table are based on a maximum boiler flow
temperature of 93°C. The expansion vessel
must be suitable to accommodate the change
involumeofwaterintheheatingsystemwhen
heated from 10°C to 110°C as specified in BS
5449:1990 clause 16.2.
Feed And Expansion Tank For OpenVented
Heating System
Thepotentialexpansionofallthethermalstores
in the range is shown in the table opposite,
alongside the capacity for expansion, in our
standard F & E tank,which can be supplied as
an optional extra.
Expansion for all other open vented systems
connected to the store must be added to this
figure. So, as a preliminary assessment of the
water content of the attached open vented
systems,a figure of 4.5 l/kW of radiator output
canbeused.Forexample,20kWradiatoroutput
would have a system volume of 90 litres,and
potential expansion of this would be 3.6 litres,
and10kW wouldbe45 litres totalvolume and
1.8 litres for expansion.
Allowance for domestic hot water for sizing the boiler
Torrent model
Allowance for domestic
hot water heating (kW)
Full divert mode Flow share mode
140 0 2
170 0 3
210 0 3.5
280 0 4.5
350 0 6.0
450 0 8.0
ExpansionVessel 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) ExpansionVesselVolume (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
Potential
Expansion of
Water in Store
(litres)
Minimum Number of Feed and
ExpansionTanks
(16 litre model inc.10 litre expansion)
TGH140 OV model - 6.6
SP model - 6.6 1
TGH170 OV model - 7.0
SP model - 7.0 1
TGH210 OV model - 9.6 SP model - 9.5
SOL model - 8.0 1
TGH250 OV model - 10.6 SP model - 10.1
SOL model - 11.1 2
TGH350 OV model - 16.5 SP model - 16.3
SOL model - 16.4 2
TGH450 SOL model - 21 3
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).

Page 19
INSTALLATION
TORRENT GREENHEAT OV
Open vented heating systems
The open vented primary system is filled via the
feed and expansion (F&E) tank fitted with the
TorrentOVmodelandthereforeitisimportantthat
theF&Etankispositionedatleast250mmabove
the highest point in the system. Please check
the F&Etank isbig enoughfor thewhole system
expansion. Also ensure that the height of the
F&Etank issufficient to meet themanufacturer’s
requirementsfortheminimumheadrequiredfor
theboilerandthesystempump(s).
The Torrent OV models can be installed using
both‘Y’Planand‘S’Planheatingsystemcontrols.
Thesemodelscanalsobeinstalledwithouteither
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
unlessTRV’sareused onallradiators.
Iftheflowandreturnpipesbetweentheboiler
and the Torrent OV thermal store are dipped
asillustratedintheschematicshownopposite,
then the boiler selected must be suitable for a
sealedheatingsystemi.e.itmustbefittedwith
an overheat thermostat. Automatic air vents
should be fitted at appropriate places to vent
the system and a pressure relief valve should
also be fitted close to the boiler.
AnyboilercanbeusedwiththeTorrentOVand
theTorrentSOLprovidedtheflowpipefromthe
boiler to theTorrent is continuously rising.The
flow pipe between the boiler and the Torrent
thermal store is part of the open vent and
thereforeitmustnotbefittedwithanyisolating
valve,non-returnvalveoranyothercomponent
which can obstruct the flow.
The minimum size of flow and return pipe
between the boiler and the Torrent should be
22mmcopperorequivalent.Inanycaseitshould
be sized to suit the installed boiler capacity,
availablepumpheadand the circuitresistance.
Thewaterlevelmustbesetcorrectlybyadjusting
the ball valve in the F&E tank.The overflow/
warningpipe,shouldbenolessthan the20mm
internaldiameter andhaveacontinuousfall.
Theoverflow/warning pipeshouldbefittedto
discharge clear of the building and be sited so
that any overflow can be easily observed.The
warningpipeshouldbeinstalledineitherhigh
temperature uPVC or copper and should not
have any other connections to it.
If the boiler does not incorporate an overheat
thermostat,thenoneshouldbefittedtothestore.
2 Pump System
Max.
height
10m
Min. 250mm
2 Pump SystemWith Dipped Boiler Flow and Return Pipe
Must comply
with boiler
manufacturer
instructions
Min. 250mm

Page 20
INSTALLATION
TORRENT GREENHEAT OV
The two diagrams shown on this page show
how an ‘S’ plan and ‘Y’ plan may be used in
conjunction with the Torrent GreenHeat OV,
withanotherspaceheatingsupplybeingtaken
directfromthestore.Thetypeofspaceheating
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
boilertofireagain;theboilerthenshortcycles.
If an off delay timer is used it allows the pump
to overrun for about a minute to remove any
excessheat;thenshutsoffthepump,butitdoes
notremovesomuchoftheheatfromthestore
that it causes the boiler to fire again.
Asolidfuelboilerisalsoabletobeconnectedto
theTorrent GreenHeatOV,pleaserefertopage
20 for further information.
S Plan OpenVented Heating System
Max.
height
10m
Min. 250mm
Auxiliary
central heating
Y Plan OpenVented Heating System
Max.
height
10m
Min. 250mm
Auxiliary
central heating