gledhill Torrent THP180, Torrent THP300, Torrent THP210, Torrent THP250, Torrent THP450 Design, Installation & Servicing Instructions
Design, Installation
& Servicing Instructions
All models comply with the Hot Water Association
specifi cation 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
A WRAS listed product developed by Gledhill
Building Products in the 1980’ s in conjunction
with British Gas plc.
British patent nos. 1358166, 2136099
British patent applications published under
nos. 2136099, 2153503, 2153504, 8516025
This product is manufactured under an ISO
9001:2008 Quality System audited by BSI.
Gledhill’ s fi rst priority is to give a high quality
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
The Building Regulations (England & Wales) r equir e that the installation of a heating
appliance be notifi ed to the relevant Local Authority Building Control Department.
From 1st April 2005 this can be achieved via a Competent Person Self Certifi cation
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 Certifi cation Scheme for gas heating appliances.
These arrangements represent a change from the situation whereby compliance with
the Building Regulations was accepted if the Benchmark Logbook was completed and
this was then left on site with the customer).
With the introduction of a self certifi cation scheme, the Benchmark Logbook is being
replaced by a similar document in the form of a commissioning check list and a service
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
and commissioning of central heating systems in the UK and to encourage the regular
servicing of all central heating systems to ensure safety and effi ciency.
Building Regulations require that the heating installation should comply with the
manufacturer’s instructions. It is therefore important that the commissioning check
list is completed by the competent installer . This check list only applies to installations
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.
Any water distribution and central heating installation must comply with the relevant
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
installation is notifi able to building control unless it is carried out under an approved
competent person self-certifi cation scheme.
Although the secondary supply (domestic) is at mains pressure, it is not necessary to
fi t an expansion chamber, pressure or temper atur e relief 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 specifi cation 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,
selection or specifi cation or for the effectiveness of an installation containing one of
our products unless we have been specifi cally requested to do so.
All goods are sold subject to our Conditions of Sale and Warranty 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
The Torrent HP is a directly heated, open vented
thermal store designed for use with an air
source or a ground source heat pump. 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).
The Torrent HP range of primary thermal stores
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 fl ow rates to
fi ll baths rapidly.
Because this product does not require a safety
discharge from the temperature and pressure
relief valve, any installation will be easy to
incorporate into the building and will not suffer
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
cased in a steel shell and therefore has an ozone
deletion potential (ODP) of zero and a global
warming potential (GWP) of 1.
The specifi cation of the models is listed in table 1
and the model selection guide is shown in table 2.
The hot water performance of the Torrent HP
depends upon the store temperature as shown
in fi gures 3, 4 and 5.
The suggested model sizes are based on typical hot
water usage and the store charged to about 65°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 65°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 operate until the
heat pump has raised the store to the maximum
temperature, or the overall effi ciency of the
system will be reduced.
Additional thermostat pockets are provided for
this purpose and a schematic wiring diagram is
shown in fi gure 10.
When selecting a solar model, it is important
to check that the dedicated solar volume
(shown in table 1) is suitable for the fl oor 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 fi gure 6 or from a
thermal store as shown in fi gure 7.
The Torrent HP-solar models are designed
to be heated directly by the heat pump and
indirectly by the solar thermal system as shown
schematically in fi gures 8 and 9.
All models are fi tted 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
Torrent HP models are supplied with following
equipment as standard: -
• 1 feed and expansion cistern complete with
ball valve and fl oat
• 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 performanc e of T150HP at 15 - 17 l/ m in draw off rate
0
10
20
30
40
50
60
70
0 20406080100120140160
Draw-off volume (l i tres )
Hot water t emperat ure °C
55°C St ore temperature 60°C Store t em perat ure 65°C St ore temperature
The performance fi gures shown above for the 150 litre store are increased accordingly
as the cylinder capacity increases. The graph illustrates the increase in volumme that
can be achieved by the use of the auxiliary heat source.
A 15 - 17 litre/min fl ow restrictor is fi tted to the T orr ent HP hot water supply outlet on
commissioning. Check that the hot water fl ow 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
pump with minimal use of the auxiliary immersion element then it may be
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 fi tted with a non-adjustable low
system pressure switch.
• The heat pumps normally operate at lower temperature difference (5-10°C)
between fl ow and return than that for a gas boilers (10-20°C) resulting in higher fl ow
rates in the heat pump primary circuit. Therefore it is important that the primary
pipework connecting the heat pump to the thermal store and the circulating pump
are sized to achieve fl ow rates recommended by the heat pump manufacturer.
• The effi ciency (i.e. coeffi cient of performance, COP) of a heat pump depends
upon the primary fl ow and return temperatures and it is generally higher at lower
primary circuit temperatures. Also the heat pumps normally operate at lower fl ow
temperatures; typically 45-55°C compared with 75-80°C for gas boilers. Therefore if
traditional radiators are used then, these should be oversized in accordance with
the heat pump manufacturers recommendations.
• For optimum operational efficiency and hence lower running costs, a low
temperature space heating (e.g. under-fl oor heating) system should be used where
feasible.
Heat Pump Sizing
• The effi ciency (i.e. coeffi cient 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), depends upon the operating mode. For example, if the system is designed
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 Hot Water Heating
Model
Allowance for Domestic Hot Water
Hot Water 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
as shown in fi gures 6 and 8 or from the thermal
store as shown in fi gures 7 and 9. The selection
between the two options will depend upon the
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 benefi t
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).
• If the heat pump is multi-stage or modulating
type or has weather compensating controls,
then the space heating circuit should be
supplied directly from the heat pump as
shown in figures 6 and 8. In this system
confi guration, the thermal store is only used
for producing hot water.
• A hybrid system arrangement can also
be used (not shown). For example; a low
temperature weather compensated heating
circuit e.g. under floor heating can be
supplied directly from the heat pump circuit
and constant temperature e.g. towel rails can
be supplied from the thermal store.
Ballvalve/overfl ow - All Models
Where the whole of the heating system is
supplied from the thermal store, fi gures 7 and
9, then a ballv alve and overfl ow should be fi tted
in the feed and expansion tank.
Where the heat pump supplies the heating
circuit directly, fi gures 6 and 8, then fi tting a
ballvalve and overfl ow is optional if it is practical
on occasions to manually fi ll the store. Ho wever ,
fi tting a ballvalve and overfl ow will eliminate the
need for the householder to undertake this task
and is therefore preferable. If the siting of the
Torrent HP makes it diffi cult to fi t an overfl ow
then the ‘manual fi ll’ option can be used. In all
cases, if a ballvalve is fi tted, then an overfl ow/
warning pipe must always be fi tted.
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