gledhill Torrent THP150 User guide

Design, Installation
& Servicing Instructions
All models comply with the HotWater Association
specification for thermal stores
Please leave these instructions adjacent
to the appliance
An open vented mains pressure
thermal store designed for use
with heat pumps

Page 2
CONTENTS
Section Page
DESIGN
Introduction 3
System Design 8
INSTALLATION
Installation 11
Commissioning 17
SERVICING
Short Parts List 18
APPENDIX
Appendix A 19
Appendix B 20
Terms & Conditions 22
ISSUE 2:10-09
AWRASlistedproductdevelopedbyGledhill
BuildingProductsinthe1980’sinconjunction
with British Gas plc.
British patent nos.1358166,2136099
Britishpatentapplicationspublishedunder
nos.2136099,2153503,2153504,8516025
This product is manufactured under an ISO
9001:2008 Quality System audited by BSI.
Gledhill’sfirstpriorityistogiveahighquality
service to our customers.
Quality is built into every Gledhill product
and we hope you get satisfactory service
from Gledhill.
If not please let us know.
Building Regulations and Benchmark Commissioning
TheBuilding Regulations (England &Wales)require thatthe installation of a heating
appliance be notified to the relevant Local Authority Building Control Department.
From 1st April 2005 this can be achieved via a Competent Person Self Certification
Scheme as an option to notifying the Local Authority directly. Similar arrangements
will follow for Scotland and will apply in Northern Ireland from 1st January 06.
CORGI operates a Self Certification Scheme for gas heating appliances.
Thesearrangementsrepresentachangefromthesituationwherebycompliancewith
theBuildingRegulationswasacceptediftheBenchmarkLogbookwascompletedand
this was then left on site with the customer).
Withtheintroductionofaselfcertificationscheme,theBenchmarkLogbookisbeing
replacedbyasimilardocumentintheformofacommissioningchecklistandaservice
interval record is included with all gas appliance manuals. However, the relevant
Benchmark Logbook is still being included with all Thermal Storage products and
unvented cylinders.
Gledhill fully supports the Benchmark aims to improve the standards of installation
andcommissioningofcentralheatingsystemsintheUKandtoencouragetheregular
servicing of all central heating systems to ensure safety and efficiency.
Building Regulations require that the heating installation should comply with the
manufacturer’s instructions. It is therefore important that the commissioning check
listiscompletedbythecompetentinstaller.Thischecklistonlyappliestoinstallations
in dwellings or some related structures.

Page 3
INTRODUCTION
DESIGN
These instructions should be read in conjunction with the Installation and Servicing
Instructions issued by the manufacturers of the heat pump used.
Anywaterdistributionandcentralheatinginstallationmustcomplywiththerelevant
recommendations of the current version of the Regulations and British Standards
listed below:-
Gas Safety Regulations
Building Regulations
I.E.E. Requirements for Electrical Installations
Water Regulations
British Standards
BS6798,BS5449,BS5546,BS5440:1,BS5440:2,CP331:3,BS6700,BS5258,BS7593:1993
and BS7671.
It must be installed by a competent person as stated in the Gas Safety Regulations
where applicable.Manufacturers notes must NOT be taken as over-riding statutory
obligations.
Torrent HP is not covered by Section G3 of the current Building Regulations but the
installationisnotifiabletobuildingcontrolunlessitiscarriedoutunderanapproved
competent person self-certification scheme.
Althoughthe secondary supply(domestic)is atmains pressure,itis notnecessary to
fitanexpansion chamber,pressureor temperaturerelief valve,the plumbing should
allow any unusual build up of pressure to be relieved at the ball valve.
The information in this manual is provided to assist generally in the selection of
equipment. The responsibility for the selection and specification of the equipment
must however remain that of the customer and any Designers or Consultants
concerned with the design and installation.
Please Note: We do not therefore accept any responsibility for matters of design,
selectionor specification or forthe effectiveness of aninstallationcontaining one of
our products unless we have been specifically requested to do so.
Allgoodsare sold subjecttoourConditions of SaleandWarranty Terms, which
are set out at the rear of this manual.
In the interest of continuously improving the Torrent HP range, Gledhill Building
Products Ltd reserve the right to modify the product without notice, and in these
circumstances this document, which is accurate at the time of printing, should be
disregarded. It will however be updated as soon as possible after the change has
occurred.
Description
TheTorrentHPisadirectlyheated,openvented
thermal store designed for use with an air
sourceoragroundsourceheatpump.Although
the thermal store is open vented, the mains
pressure hot water is heated instantaneously
by means of heat exchangers inside the store
(Figures 1 & 2).
TheTorrentHPrangeofprimarythermalstores
are only suitable for open vented heating
systems but they provide mains pressure hot
water without the requirements of a pressure
and temperature relief valve. Notification
to Building Control to comply with Section
G3 of the Building Regulations is therefore
not required. This is because the thermal
store is vented in the normal way and unlike
an unvented storage cylinder, the Torrent
HP range require no regular maintenance
or annual inspection. This reduces running
costs for the home-owner while offering high
performance showers and high flow rates to
fill baths rapidly.
Becausethis product doesnot require asafety
discharge from the temperature and pressure
relief valve, any installation will be easy to
incorporateintothebuildingandwillnotsuffer
from the problems associated with using soil
stacks to take the high temperature discharge
from unvented cylinders.

Page 4
DESIGN
INTRODUCTION
Torrent HP Models
The Torrent HP is insulated to a very high
standard using high density HCFC free foam
casedinasteelshellandthereforehasanozone
deletion potential (ODP) of zero and a global
warming potential (GWP) of 1.
The specification of the models is listed in table 1
andthemodelselectionguideisshownintable2.
The hot water performance of the Torrent HP
dependsuponthestoretemperatureasshown
in figures 3, 4 and 5.
Thesuggestedmodelsizesarebasedontypicalhot
waterusageandthestorechargedtoabout65°C.If
thestorechargetemperatureisgoingtobelower,
thenalargermodelshouldbeconsidered.
This is especially important where the heat
pump alone is unable to charge the store
to 65°C as is likely to be the case with a heat
pump.Iftheimmersionelementisusedtoraise
the temperature of the store, then a suitable
control system should be used to ensure the
immersionelement does not operateuntil the
heatpumphasraisedthestoretothemaximum
temperature, or the overall efficiency of the
system will be reduced.
Additionalthermostatpocketsareprovidedfor
thispurposeandaschematicwiringdiagramis
shown in figure 10.
When selecting a solar model, it is important
to check that the dedicated solar volume
(shown in table 1) is suitable for the floor area
of the dwelling to ensure compliance with the
Building Regulations.
The Torrent HP models are designed to be
heated directly by the heat pump and the
central heating can be supplied directly from
the heat pump as shown in figure 6 or from a
thermal store as shown in figure 7.
The Torrent HP-solar models are designed
to be heated directly by the heat pump and
indirectlybythesolarthermalsystemasshown
schematically in figures 8 and 9.
All models are fitted with a 3kW immersion
heater for boosting the store temperature
(if necessary) and some models can also be
connected to a solid fuel appliance (e.g. wood
burning stove) as well as the heat pump. All
TorrentHPmodelsaresuppliedwithfollowing
equipment as standard: -
• 1feedandexpansioncisterncompletewith
ball valve and float
• 1 3kW immersion heater (230Vac, 50Hz)
• 2 store thermostats
Overflow pipe
Heat pump - Flow
Hot water outlet
Cold mains feed
Adjustable thermostatic
mixing valve
Wood burning stove
-Flow
Wood burning stove
-Return
Heat pump - Return
Central heating
-Flow
Central heating
-Return
Immersion heater
Heat pump
control thermostat
Heat pump
control thermostat
Overheat
thermostat pocket
Figure 1 : Torrent
HP
F & E CisternF & E Cistern
Overflow pipe
Heat pump - Flow
Hot water outlet
Cold mains feed
Adjustable thermostatic
mixing valve
Wood burning stove
-Flow
Wood burning stove
-Return
Heat pump - Return
Central heating
-Flow
Central heating
-Return
Immersion heater
Heat pump
control thermostat
Heat pump
control thermostat
Overheat
thermostat pocket
Figure 1 : Torrent
HP
F & E CisternF & E Cistern
Overflow pipe
Hot water outlet
Cold mains feed
Adjustable thermostatic
mixing valve
Central heating
Flow
Central heating
Return
Immersion heater
Heat pump
control thermostat
Overheat
thermostat pocket
Heat pump - Flow
Wood burning stove
-Flow
Wood burning stove
- Return
Heat pump - Return
Solar heating - Flow
Solar heating - Return
Solar sensor pocket
Heat pump
control thermostat
Overflow pipe
Hot water outlet
Cold mains feed
Adjustable thermostatic
mixing valve
Central heating
Flow
Central heating
Return
Immersion heater
Heat pump
control thermostat
Overheat
thermostat pocket
Heat pump - Flow
Wood burning stove
-Flow
Wood burning stove
- Return
Heat pump - Return
Solar heating - Flow
Solar heating - Return
Solar sensor pocket
Heat pump
control thermostat

Page 5
INTRODUCTION
DESIGN
Figure 3 : Hot water performance of T150HP at 15 - 17 l/min draw off rate
0
10
20
30
40
50
60
70
0 20406080100120140160
Draw-off volume (litres)
Hot water temperature °C
55°C Store temperature 60°C Store temperature 65°C Store temperature
Theperformancefiguresshownaboveforthe150litrestoreareincreasedaccordingly
asthecylindercapacityincreases.Thegraphillustratestheincreasein volummethat
can be achieved by the use of the auxiliary heat source.
A15-17litre/minflowrestrictorisfittedtotheTorrentHPhotwatersupplyoutleton
commissioning.Check that the hot water flow does not exceed 17 litre/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.

Page 6
DESIGN
INTRODUCTION
F & Cistern
Overflow pipe
PRV
Heat pump HP
Pump
3-Port
diverter
valve
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 6: Typical Torrent
HP
system configuration with an optional wood burning stove
and central heating supplied directly from the heat pump.
F & Cistern
Overflow pipe
PRV
Heat pump HP
Pump
3-Port
diverter
valve
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 6: Typical Torrent
HP
system configuration with an optional wood burning stove
and central heating supplied directly from the heat pump.
F & Cistern
Overflow pipe
HP
Pump Hot water outlet
Mains cold water inlet
Figure 7: Typical Torrent
HP
system configuration with central heating supplied from a thermal store
CH
Pump
PRV
Heat pump
F & Cistern
Overflow pipe
HP
Pump Hot water outlet
Mains cold water inlet
Figure 7: Typical Torrent
HP
system configuration with central heating supplied from a thermal store
CH
Pump
PRV
Heat pump

Page 7
INTRODUCTION
DESIGN
PRV
Heat pump
3-Port diverter
valve
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 8: Typical TorrentHP-sol system configuration with optional wood burning stove
and central heating supplied directly from the heat pump.
F & E
Cistern
Overflow pipe
HP
Pump
PRV
Solar pumping
station
Expansion
vessel
PRV
Heat pump
3-Port diverter
valve
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 8: Typical TorrentHP-sol system configuration with optional wood burning stove
and central heating supplied directly from the heat pump.
F & E
Cistern
Overflow pipe
HP
Pump
PRV
Solar pumping
station
Expansion
vessel
PRV
Heat pump
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 9: Typical TorrentHP-sol system configuration with wood burning stove option
and central heating supplied from the thermal store
F & E
Cistern
Overflow pipe
HP
Pump
PRV
Solar pumping
station
Expansion
vessel
CH
Pump
PRV
Heat pump
Hot water outlet
Mains cold water inlet
Wood stove
(Option)
Figure 9: Typical TorrentHP-sol system configuration with wood burning stove option
and central heating supplied from the thermal store
F & E
Cistern
Overflow pipe
HP
Pump
PRV
Solar pumping
station
Expansion
vessel
CH
Pump

Page 8
DESIGN
SYSTEM DESIGN
General
• All Torrent HP models covered by this manual, are only suitable for open vented
primary (heat pump and space heating) circuits. Therefore the pressure in the
primary circuit depends upon the height of the feed and expansion cistern 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 areusedthen, theseshouldbe oversizedinaccordance with
the heat pump manufacturers recommendations.
• For optimum operational efficiency and hence lower running costs, a low
temperaturespaceheating(e.g.under-floorheating)systemshouldbeusedwhere
feasible.
Heat Pump Sizing
• The efficiency (i.e. coefficient of performance, COP) of an air source heat pump
and hence its heat output generally decreases as the ambient air temperature
decreases. Therefore, this factor should be taken into account when sizing and
selecting the heat pump.
• The design space heating load of a dwelling should be calculated in accordance
with BS 5449. The allowance for domestic hot water heating (shown in table
below),dependsupontheoperatingmode.Forexample,ifthesystemisdesigned
to operate 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
Model Allowance for Domestic HotWater
HotWater Priority Mode Flow Share Mode
THP150
THP180-SOL 0kW 1.5kW
THP180
THP210-SOL 0kW 2.5kW
THP210
THP250-SOL 0kW 3.0kW
THP250
THP300-SOL 0kW 3.5kW
THP300
THP450-SOL 0kW 4.0kW
THP450-SOL 0kW 5.0kW
Heating System Arrangement
The Torrent HP models are designed to be
heated directly by an air or a ground source
heat pump and the space heating can be
supplied directly from the heat pump circuit
asshowninfigures6and8orfromthethermal
storeasshowninfigures7and9.Theselection
betweenthetwooptionswilldependuponthe
operating characteristics of the heat pump,
type of heating system and control strategy.
For general guidance: -
• If the heat pump requires a buffer for
operation; for example to reduce rapid
cycling etc, then the system would benefit
if the heating system is supplied from
the thermal store (figures 7 and 9). In
this configuration, the operation of the
heat pump Is only controlled by the store
thermostat(s).
• Iftheheatpumpismulti-stageormodulating
typeorhasweathercompensatingcontrols,
then the space heating circuit should be
supplied directly from the heat pump as
shown in figures 6 and 8. In this system
configuration,thethermalstoreisonlyused
for producing hot water.
• A hybrid system arrangement can also
be used (not shown). For example; a low
temperatureweathercompensatedheating
circuit e.g. under floor heating can be
supplieddirectlyfromtheheatpumpcircuit
andconstanttemperaturee.g.towelrailscan
be supplied from the thermal store.
Ballvalve/overflow - All Models
Where the whole of the heating system is
supplied from the thermal store,figures 7 and
9,thenaballvalveandoverflowshouldbefitted
in the feed and expansion tank.
Where the heat pump supplies the heating
circuit directly, figures 6 and 8, then fitting a
ballvalveandoverflowisoptionalifitispractical
onoccasionstomanuallyfillthestore.However,
fittingaballvalveandoverflowwilleliminatethe
needforthehouseholdertoundertakethistask
and is therefore preferable.If the siting of the
Torrent HP makes it difficult to fit an overflow
then the‘manual fill’option can be used.In all
cases,if a ballvalve is fitted,then an overflow/
warning pipe must always be fitted.

Page 9
SYSTEM DESIGN
DESIGN
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:
• The chosen system is recommended for use in domestic heating systems
by the manufacturers and it is installed fully in accordance with their
recommendations.
• ThedesigncriterionoftheplasticsystemisatleastequivalenttotheuseofBS/EN
Standard copper pipework and fittings.
• The barrier pipework for these systems is recommended.
Use In HardWater Areas - All Models
Thepatenteddesignoftheheatexchangemoduleissuchthattheturbulencethrough
the coil slows down the formation of scale in even the hardest water conditions,at
normal operating pressures.
Scale Protection
The Building Regulations approved document L1A and L1B and the requirements
set out in the ‘Domestic Heating Compliance Guide’ specify that “where the mains
waterhardnessexceed200ppmprovisionshouldbemadetotreatthefeedwaterto
the water heaters and the hot water circuit of combination boilers to reduce rate of
accumulation of lime scale”.
Tocomplywiththisrequirement,thehardnessofthemainswatershouldbechecked
by the installer and if necessary a suitable in-line scale inhibitor device should be
specified for hardness levels between 200 and 300ppm (mg/l).
ItisimportantthatwherethesupplytotheTorrentisin22mmthein-linescaleinhibitor
is also 22mm. In practice servicing is not normally required but in hard water areas
requirementscanbeconsideredsimilartothoseneededforinstantaneousor‘combi’
appliances.
Theinstallationofthescaleinhibitorshouldbeinaccordancewiththemanufacturers
instructions and with the Water Byelaws.
Wherethewaterhardnesslevelis300ppm(mg/l)andabove,theoptionalphosphate
type inhibitor should be specified and fitted at a suitable point in the cold water
supply to the appliance.
WaterTreatment And Frost Protection
Althoughthe TorrentHP hasno specialwatertreatmentrequirements,the radiators
and other parts of the circuit will require the application of a scale and corrosion
inhibitor. The heat pump and the external connecting pipework will also require
protection against freezing. For this reason, a combined antifreeze and inhibitor
product such as Fernox Alphi 11 must be used (see Fernox Alphi 11 datasheet in
Appendix B).
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 HP should be taken into account (see table ).
InallTorrentHPmodels,treatingtheprimarywaterwillnotcontaminatethedomestic
hot water.

Page 10
Table 1a - Technical Specification ofTorrent HP
THP150 THP180 THP210 THP250 THP300 THP450
Nominal volume litres 149 191 224 250 300 450
Overallheight mm 1440 1440 1675 1600 1800 1800
Overalldiameter mm 555 555 555 655 655 855
Minimum cupboard size Height mm 1990 1990 2225 2150 2350 2350 Width mm 680 680 680 780 780 780
Depth mm 680 680 680 780 780 780
Weight Empty kg 51 54 58 63 67 77
Full kg 200 245 282 313 367 527
Standbyheat loss rate kW/24h 1.56 1.82 2.08 2.25 2.41 2.85
Maximum working pressure
Open vented store mWG 5.0 5.0 5.0 5.0 5.0 5.0
Space heating and heat pump
primary circuits mWG 5.0 5.0 5.0 5.0 5.0 5.0
Solar heat exchanger bar 6.0 6.0 6.0 6.0 6.0 6.0
Connections
Open vent mm 22 22 22 28 28 28
Coldfeed mm 15 15 15 15 15 15
CH flowand return mm - 22 22 28 28 35
HP flowand return mm 22 22 22 28 35 35
Wood burning stove flow and
return mm - 2828282828
Drain in R½” R½” R½” R½” R½” R½”
Thermostat / sensor pockets Heat pump control thermostat
pockets 1 & 2 in R½” R½” R½” R½” R½” R½”
Over heat thermostatic pocket mm 8.5 ID 8.5 ID 8.5 ID 8.5 ID 8.5 ID 8.5 ID
3kW,230Vac,50Hz immersion heaters - type 2 111122
Hot water draw off volume at
35°C temperature rise (1)
Store charged at 55°C litres 70 90 100 118 136 193
Storecharged at 60°C litres 100 130 140 165 195 275
Storecharged at 65°C litres 125 155 180 210 240 350
Notes
(1) Hot water draw-off rate 15-17 l/min for 150/180/210,17-20 l/min for 250/300 and 22-25 l/min for 450
DESIGN
SYSTEM DESIGN
Table 2a - Model selection guide
Bedrooms 1-2 2-3 2-3 3-4 3-4 4-5
Bathrooms 1 1 1 2 2 3
En-suiteshowers 0 1 2 1 2 2
Torrent HP model THP150 THP180 THP210 THP250 THP300 THP450

Page 11
SYSTEM DESIGN
DESIGN
Table 1b - Technical Specification ofTorrent HP Solar
THP180
sol THP210 sol THP250 sol THP300 sol THP450 sol
Nominal volume litres 171 223 250 300 450
Dedicated solar volume litre 62 72 80 95 140
Overallheight mm 1650 1675 1600 1800 1800
Overalldiameter mm 555 555 600 600 700
Minimum cupboard size Height mm 2200 2225 2150 2350 2350 Width mm 680 680 780 780 780
Depth mm 680 680 780 780 780
Weight Empty kg 62 63 66 71 81
Full kg 233 286 316 371 531
Maximum dwelling floor area (1) m249 60 90 105 200
Maximum net collector area (2) m22.4 2.9 3.2 3.8 5.6
Surface area of solar heat exchanger (3) m21.31 1.31 1.74 1.74 2.18
Standbyheat loss rate kW/24h 1.82 2.08 2.25 2.41 2.85
Maximum working pressure
Open vented store mWG 5.0 5.0 5.0 5.0 5.0
Space heating and heat pump
primary circuits mWG 5.0 5.0 5.0 5.0 5.0
Solar heat exchanger bar 6.0 6.0 6.0 6.0 6.0
Connections
Open vent mm 22 22 22 28 28
Coldfeed mm 15 15 15 15 15
CH flowand return mm 22 22 22 28 35
HP flowand return mm 22 22 28 35 35
Wood burning stove flow and
return mm 28 28 28 28 28
Solar circuit flowand return mm 15 15 15 15 15
Drain in R½” R½” R½” R½” R½”
Thermostat / sensor pockets
Heat pump control thermostat
pockets 1 & 2 in R½” R½” R½” R½” R½”
Over heat thermostatic pocket mm 8.5 ID 8.5 ID 8.5 ID 8.5 ID 8.5 ID
Solar system sensor pocket mm 8.5 ID 8.5 ID 8.5 ID 8.5 ID 8.5 ID
3kW,230Vac,50Hz immersion heaters - type 2 11122
Hot water draw off volume at
35°C temperature rise (4)
Store charged at 55°C litres 70 90 100 118 136
Storecharged at 60°C litres 100 130 140 165 195
Storecharged at 65°C litres 125 155 180 210 240
Notes
(1) For checking compliance with the building regulation 2000 approved documents L1A and L1B using SAP procedure
(2) For checking compliance with the building regulation 2000 approved documents L1A and L1B using 25 l/m2of net collector area
(3) For checking compliance with the building regulation 2000 approved documents L1A and L1B
(4) Hot water draw-off rate 15-17 l/min for 150/180/210,17-20 l/min for 250/300 and 22-25 l/min for 450
Table 2b - Model selection guide
Bedrooms 1-2 2-3 2-3 3-4 3-4
Bathrooms 1 1 1 2 2
En-suiteshowers 0 1 2 1 2
Torrent HP Solar model THP180 sol THP210 sol THP250 sol THP300 sol THP450 sol

Page 12
INSTALLATION
INSTALLATION
General
• TheTorrent HP is designed to be installed in an airing cupboard and the relevant
minimum dimensions are given in table 1 ‘Technical data’. Installation and
maintenanceaccessisneededtothefrontandtopoftheapplianceandthisshould
be considered when positioning the appliance in a cupboard.
The floor of the cupboard needs to be level and even and capable of supporting
the weight of the appliance when full (see table 1 for data on weights).
• AllTorrentHPmodelsareopenventedandaresuitableforusewithanyheatpump
whichdoesnotrequireminimumpressureintheprimarywatercircuitforoperation.
The open vented primary system (thermal store,heat pump and central heating
circuits) is filled via the feed and expansion cistern supplied with the unit. It is
thereforeimportantthatthecisternispositionedatthehighestpointinthesystem.
Itisimportanttoensurethattheminimumheadfortheheatpumpandthesystem
pump is as required by the heat pump manufacturer.
• It is envisaged that the feed and expansion cistern will be located in the same
cupboard as theTorrent HP.However if it is necessary to locate the cistern in the
roofspaceoronahigherfloorthenitmustnotbefittedmorethan6metersabove
the base of theTorrent HP appliance.
If the feed and expansion cistern is installed in a roof space (or unheated part of
the dwelling),then any pipwork and the feed and expansion cistern will need to
be adequately insulated to protect against frost damage.
Please note:The feed and expansion tanks will not be large enough for all the
stores/systemslistedinthemanual.Itwillbenecessarytocoupletwotogetheror
replacewithalargertankincertaincircumstances.Weleavethistotheinstallerto
calculate because we do not know the capacities of multi fuel boilers etc.
• The heat pump should be sited as per manufacturers instructions and piped to
theTorrentHPandthepipeworkshouldbesizedfortheflowratesrecommended
by the manufacturer and in any case should not be less than 22mm.
• Combinedcoldfeedandventpipearrangementsmustnotbeusedandnovalves
should be used in the safety open vent pipe which must be minimum of 22mm
copper pipe or equivalent.
• The overflow/warning pipe shall have a continuous fall,be fitted to discharge clear
ofthe buildingand besitedsothatanyoverflowcan beeasily observed.Itshall also
be installed in a size and material suitable for use with heating feed and expansion
cisternsinaccordancewithBS5449andshouldnothaveanyotherconnectionstoit.
• The system will require at least two power supplies which needs to be 230V
AC/50Hz/Single phase.One supply for the control circuit and one for the power
supply to the heat pump. Both electrical supplies must be correctly earthed,
polarised, correctly fused and in accordance with the latest addition of the IEE
requirementsfortheelectricalinstallationBS7671.Connectionstoboththecontrol
circuit and the heat pump (main power supply) must be made using a double
pole linked isolators with a contact separation of 3mm in both poles and which
are located within 1m of the respective appliance.
• AllTorrentHP models aresuppliedwith a 3kW (230V AC,50Hz) immersion heater
whichincorporatesanadjustablecontrolthermostatandanon-resetableover-heat
energy cut out set at about 85°C.
External wiringtothe immersion heatermustbe in accordancewith the relevant
IEEWiring regulations and the circuit must be protected by a suitable fuse and a
double pole isolating switch.

Page 13
Torrent HP Models
Atypicalwiringarrangementforasysteminwhichthespaceheatingissuppliedfrom
aTorrent HP(figures 7and 9),isshowninfigure10and atypicalwiring arrangement
forasystem inwhich thespaceheatingissupplied froma heatpump circuit(figures
6 and 8),is shown in figure 11.
In figure 10,the control of heat pump is shown with top and bottom thermostats to
enhancetheperformanceoftheheatpumpbydecreasingthefrequencyofcycling.The
heatpumpisswitchedonwhenbothtopandbottomthermostatsarecallingforheatand
isswitchedoffwhenboththermostatsstopcallingforheat.Atwochannelprogrammer
suitablefor gravityhot watersystem shouldbeused with thisarrangement.
In figure 11, the generic wiring arrangement is shown with a 3-port diverter valve
withhotwaterpriority.Ifa3-portflowsharevalveisused,thenthecontrolsshouldbe
wired to provide priority for hot water because the space heating and the hot water
heating may be operating at different flow temperatures.
Torrent HP-Solar Models
TheheatpumpandspaceheatingsystemconfigurationsandoperationwiththeTorrent
HP-solarmodelsisthesameasforstandardmodels.Thesolarthermalsystemoperates
independent of the heat pump system.A typical generic solar system configuration
is shown in figures 8,9 and 12 for guidance only.The solar system and the associated
controlsshould beplanned and installedfollowingmanufacturersinstructions.
Allcomponentsinthesolarprimarysystem mustbe markedoridentifiable insuch a
way that their design pressure and temperature can be readily determined.
A safety device i.e. pressure relief valve to control the risk of over-pressure in the
systemcomponentsshould befittedaspersolar systemmanufacturers instructions.
A termination from the pressure relief valve should minimise the risk of damage to
persons or materials.Suitable locations are a high temperature receptacle,internal
gullyorelseexternallyatgroundlevel.Highlevelterminationfromawalloronaroof
could cause injury to people or animals below if the valve were to release scalding
water and steam.
The pipe leading to from the safety device to the collector should be rigid and non-
deformable construction,without any possibility of restriction,distortion or closure
by any other fitted component.
AtypicalwiringdiagramforthesolarthermalsystemfortheTorrentHP-solarisshown
in figure 11. It is advisable that an overheat thermostat is fitted to limit the store
temperature exceeding 85°C from solar gains during stagnant conditions.
Wood Burning Stove
Certain models of the Torrent HP andTorrent HP-solar have provision for connecting
otheralternativeenergysourcessuchasAGAorwoodburningstoveinconjunctionwith
aheatleakradiatorsystem.Althoughthethermalstoreisopenventedandinherentlysafe,
aheatleaksystemmustbeprovidedtopreventthepossibilityofboilingtemperatures
beingreached.Thisisnormallyachievedbyprovidingasuitablepipethermostatonthe
alternativeenergysourceflowpipewhichissettoapproximately 85-90°Candwiredso
thatwhenthistemperatureisreached,theheatingpumpand/orzonevalvewilloperate
toallow excessheattobe dissipatedthrough theheatleak circuit.
Alternative energy source should be installed and piped so that it conforms to the
manufacturers instructions.
INSTALLATION
INSTALLATION

Page 14
INSTALLATION
INSTALLATION
Figure 10 :Typical schematic wiring diagram for theTorrent HP andTorrent HP-solar
with space heating supplied from thermal store as shown in figures 7 & 9.

Page 15
INSTALLATION
INSTALLATION
Figure 11 :Typical schematic wiring diagram for theTorrent HP andTorrent HP-solar
with space heating supplied directly from the heat pump circuit as shown in figures 6 & 8.

Page 16
INSTALLATION
INSTALLATION
Figure 12 :Typical schematic wiring diagram and system configuration for theTorrent HP-solar.

Page 17
INSTALLATION
INSTALLATION
Figure 13 :Typical schematic wiring diagram for the boost immersion heater
using programmable immersion heater timer.
Boost Immersion Heater
AllTorrent HP models are fitted with a 3kW immersion heater so that the store can be
heatedtoatemperatureabovetheheatpumpdeliverytemperaturetoincreasethehot
waterperformanceoftheunitifnecessary.BecausetheTorrentHPisaprimarythermal
store it is not necessary to heat the store above 60°C for hygienic protection against
growthof‘legionella’.Thisisbecause thedomestichotwaterisheatedinstantaneously
via a heat exchanger and so there are no legionella problems associated with stored
water.
Thisisofgreatsignificancefortheheatpumpapplicationwheretheheatpumpwill
notnormallybeabletoraisestoredwater toabove60°Cwhich isnecessaryto sterilise
acylinder.
By using the immersion element to boost the water temperature (not needed for
legionella protection as described above),this will provide a greater volume of hot
waterfromagivensizeofcylinder(seefigures3-5,page5).However,theoverallCOPof
thesystemwillreduceandsotomaximisethebenefitoffittingaheatpump,minimal
use should be made of the immersion heater.
Theimmersionheatershouldnot beleftpermanentlyswitchedonasthiswilldrastically
reduce the contribution of heat pump to hot water heating and hence increase the
runningcosts.
If the use of the immersion heater is necessary to meet the hot water requirements of
adwelling,then the preferredmethodof controllingit is describedbelow.
Control By Programmer
The operation of the boost immersion heater
canbecontrolledbymeansofanindependent
timeswitchasshownschematicallyinfigure13.
The on time settings on the immersion heater
should be between 30 – 60 minutes later than
theontimes setforthehot waterprogrammer
channel.
Forexample ifthehotwaterisprogrammedto
come on between say 0600 – 0900 and 1700
–2200thentheimmersionheatertimersetting
shouldbe0640–0900and1740–2200.Thiswill
makemaximumuseoftheheatpumpallowing
ittochargethestoretothemaximumpotential
temperature before any use of the immersion
element.
Additionaltopandbottomthermostatpockets
are provided in case a more sophisticated
control system is required to be fitted.

Page 18
INSTALLATION
COMMISSIONING
Commissioning
Open the incoming stop valve and fill the domestic hot water system. Fill the whole
oftheprimaryheatingsystemandthethermalstorewithpotablewaterthroughthe
feed and expansion cistern.
Check the water level in the feed and expansion cistern and adjust the ball valve
if necessary. Check the whole of the primary heating and domestic hot and cold
distribution system, including the heat pump and the Torrent HP 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 5449 and BS
7593. Full details of the requirements are given in PAS 33:1999 under section 10
Commissioning.
• The heat pump manufacturers instructions should be followed during the
commissioning phase.
• Ifasolarthermalsystemisfitteditshouldbecommissionedaspermanufacturers
instructions.
• When using either cleansing or corrosion inhibitor chemicals, the manufactures
instructions must be followed.
Whendeterminingthequantitiesforcleanserrequired,thevolumeoftheTorrentHP
should be added to the water content of the primary system. Although the Torrent
HPhasnospecialwatertreatmentrequirements,theradiatorsandotherpartsofthe
circuit will require the application of a scale and corrosion inhibitor. The heat pump
and the external connecting pipework will also require protection against freezing.
For this reason, a combined antifreeze and inhibitor product such as Fernox Alphi
11 must be used.
If it is proposed to ‘powerflush’ the heating system we would recommend that the
TorrentHP is isolated fromthe heating systembeingcleaned. Failure todo so could
seriously damage the unit. If in doubt please contact our ‘Technical Helpline’.
Ensure that theTorrent HP cistern is installed with the water level topped up to the
level mark inside the feed and expansion cistern and the ballvalve is set correctly.
Ensurethattheheatpumpcircuitandthespaceheatingcircuitarefittedandvented
correctly.
Commission the heat pump as per the manufacturers instructions.
Check that the space heating system controls are functioning correctly ie. the
programmer and room thermostat.
Switchoff thespace heating and allowthe heat pumpto heat thestoreonly.During
thisheatingcycle,adjustthestorethermostatssothattheyswitchontheheatpump
just before it starts to cycle on its internal thermostat.
Check the store thermostat setting by drawing off the hot water and reheating the
thermal store.
Ifnecessary,usetheimmersionheatertoboostthestoretemperature.Iftheimmersion
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 operate until the heat
pump has raised the store to the maximum temperature,or the overall efficiency of
thesystem will be reduced.Checkthat the totalhot water flowrate fromtheTorrent
HP is a maximum of 15 - 17 litres/min.If necessary fit additional flow restrictors.
Important Do’s and Don’ts
DO - Check the incoming mains water
pressure. If it exceeds 3.5 bar at any
pointina24hourcyclethenapressure
limiting valve set at 3.5 bar should be
fittedwherethecoldsupplyentersthe
property.
DO - Check that all connections are in
accordance with the labelling on the
thermal store.
DO - Fill the cistern manually or adjust the
ballvalve so that the water in the F &
E cistern is set to the correct level.
DO - Restrict the ballvalve fill rate when
full so that the overflow pipe can
copewiththefillrateintheeventofa
ballvalve failure.
DO - Makesurethereis adequateclearance
above the F & E cistern to service the
valve.
DO - Ensure that the water level in the
expansion cistern is at least 250mm
above the highest point on the
radiatorcircuitand satisfiestheboiler
head required.
DO - Insulateanyexposed pipeworkin the
Torrent cupboard.
DO - Plumb the overflow warning pipe in
20mm minimum internal diameter
tubing to discharge in a conspicuous
external position, using high
temperature uPVC or copper.
DO - Check the pump setting. This should
besettogiveatemperature difference
recommendedbythemanufacturerof
the heat pump.
DON’T - Use a combined feed and vent on
Torrent indirect installations.

Page 19
SHORT PARTS LIST
SERVICING
Description Stock Code Gas Council
Part Number
1Ballvalve Float FT429 370 506
2Mixing Valve - Brawa XC007 385 872
3Immersion Heater 3kW XB078 E39 184
4ControlThermostat XC010

Page 20
APPENDIX
APPENDIX A
VastquantitiesofwaterareneedlesslyrunofftowasteduetoTaps,MixersandShowers
discharging flow rates far in excess of the rates required for them to perform their
duties.
Thecontrastingflow ratesshownon thisleafletclearly illustratethe savingsthatcan
be made whilst still providing a good performance.
British made Aquaflow Regulators provide constant flow rates by automatically
compensating for supply pressure changes between 1 bar & 10 bars.
To facilitate installation into the wide range of plumbing equipment which is
encountered in the U.K,Four Fixing Options are available:-
Options For Showers
1. MXF“DW”Range-ForfittingbehindFixedShowerHeadsorontoFlexibleHosesfor
Handshowers (preferably onto the inlet end when lightweight hoses are used).
2. Compression Fitting Range.“In Line”regulators as in Option 4 forTaps & Mixers.
Information by courtesy of
AQUAFLOW REGULATORS LTD
Haywood House,40 New Road,Stourbridge,West Midlands DY8 1PA
TELEPHONE [phone] FAX:[phone]
Water Savings
Water Related Costs Can Be Reduced By Good Plumbing Practice
TAPS & MIXERS
SHOWERS
Unregulated
25 - 30 l/m
Regulated
10 - 12 l/m
Over
20 l/m
5, 6 or
8 l/m
2 tap
half open
Fitted with regulator
Unregulated
4 Fixing Options ForTaps & Mixers
1. MKRange-CombinedRegulators&Aerator
forscrewingontoTaps&Mixerswithinternal
orexternalthreadsontheirnoses.AntiVandal
models also available.
2. MR05-T Range - Internal Regulators. Push-
fit into Tap or Mixer seats. Produced in
three sizes - 12.5mm (BS1010), 12mm &
10mm,Flangeless models also available for
Taps with Low Lift washers.
3. MXF Standard Range - Screw on tail
models for Taps & Mixers.Fix onto the tails
before fitting the tap connectors.Available
in 3/8",1/2",3/4" and 1" BSP.
4. Compression Fitting Range - “In Line”
regulators housed in 15mm & 22mm CXC
Couplers&IsolatingValves.“ ”UKWFBSlisted
bytheWaterResearchCentre.Isolationvalves
availableforslottedscrewdriveroperationor
withcolouredplastichandles.Nowavailable
also in plastic bodied push-fit couplers &
valves.
2
1
1
2
1
2
3
3
1
4