gledhill Stainless Lite HP Indirect 180-400 litres User guide

Design, Installation & Servicing Instructions
Models covered in this manual
Stainless Lite HP SOL Indirect 180-400 litres
Stainless Lite HP Indirect 180-400 litres
Stainless Lite HP Slimline 180-210 litres
StainlessLite HP
Unvented cylinders specifically designed to work with a heat pump

Page 2
Section Page
DESIGN
Description 3
Technical Information 5
System Design 7
INSTALLATION
Installation 11
Commissioning 22
USER INSTRUCTIONS 23
SERVICING AND MAINTENANCE
Servicing and Maintenance 24
Fault Finding 25
Short Parts List 27
APPENDIX
Appendix A 28
Appendix B 29
Notes 30
Terms & Conditions 32
Benchmark Checklist 34
Benchmark Service Record 35
ISSUE 11: SEPTEMBER 2014
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 theWater 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 EN 12828, BS EN 12831, BS EN 14336; BS 5546;
BS 5440:1; BS 5440:2; CP 331:3
BS EN 806-1 to 5, BS EN 8558:2011: BS EN 1458-1:2011 and BS 7593:2006
Stainless Lite is covered by Section G3 of the Building Regulations (England and Wales)
Technical Standard P3 (Scotland) and Building Regulation P5 (Northern Ireland).
Compliance can be achieved via a Competent Person Self Certication Scheme or
noticaton of installation to the Local Authority Building Control Department.
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
Please note: that we do not therefore accept any responsibility for matters of
design selection or specication, for the eectiveness of an installation or system
containing one of our products unless specically requested to do so in writing.
All goods are sold subject to our Conditions of Sale which are set out at the rear of this
specication. In the interest of continuously improving the Stainless Lite range, Gledhill
Building Products Limited reserve the right to modify the product without notice, and
in these circumstances this booklet, which is accurate at the time of printing, should
be disregarded. An updated set of Instructions will be produced and supplied with
new appliances and will be made available for other appliances on request.
Stainless Lite is produced under an ISO 9001:2008 Quality Management System
approved by BSI.
Benchmark places responsibilities on both manufacturers and installers.The purpose is to
ensure that customers are provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the manufacturers instructions
by competent persons and that it meets the requirements of the appropriate Building
Regulations. The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations and should be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work
in accordance with the Benchmark Code of Practice which is available from the
Heating and Hot Water Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
For further information on the HWA Charter Membership, please refer to the HWA website
hotwater.org.uk.

Page 3
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. Unvented hot water storage
vessels need regular routine checks, and these
are detailed below. It is for this reason that this
manual must always be left with the Stainless
Lite.
It is essential that these checks be carried out
at the time of boiler maintenance by a qualied
installer:
1. Manually open the relief valves in turn, and
check that water is discharged from the
valves and runs freely through the tundish
and out at the discharge point. Ensure that
the valves re-seat satisfactorily. (Note - the
water may be very hot).
2. It is important to check that the discharge
pipework is carrying the water away
adequately. Check for blockages etc. if it is
not.
3. Turn the mains water o and remove and
clean the strainer element in the Pressure
Reducing Valve.
4. Check the charge pressure in the expansion
vessel and repressurise if required
5. Re-ll the system and ensure that all relief
valves have re-seated.
6. The Benchmark Service Record should be
updated at each service.
7. Check the water pressure downstream of the
combination valve is bar in static condition.
8. Check and if necessary, descale the heat
exchanger in hard water areas ie. above
200ppm (mg/l).
Note:
The cylinder is factory tted with a temperature
& pressure relief valve that must not be used for
any other purpose or removed.
The cylinder is factory tted with immersion
heaters with thermal cut outs. Immersions
without thermal cut outs must not be tted.
Manufacturer: Gledhill Building Products Ltd
Maximum inlet pressure to
Pressure reducing valve 12 bar
Operating pressure (PRV setting) 3 bar
Expansion vessel charge pressure 3 bar
Expansion relief valve setting 4.75 bar
Opening pressure of P & T Relief Valve 6 bar
Opening temperature of P & T Relief Valve 92-95°C
Energy cut-out thermostat setting 85°C
Max. working pressure - Primary heat exchanger (Indirect models) 6 bar
Max. working pressure - Solar heat exchanger (Solar models) 10 bar
Immersion heater rating 3kW, 240V AC
All cylinders are manufactured in accordance with the requirements of BS EN 12897
The tundish must be positioned so that it is visible to the occupant and is away from
electrical devices.
Components supplied with Stainless Lite:
• Cold water inlet PRV combination valve/expansion relief
• Lift up pressure and temperature relief valve
• Control thermostat
• Energy cut-out thermostat
• Energy cut-out motorised valve (indirects only)
• Tundish
• 3kW Immersion heater including control and cut out thermostats
• Expansion vessel/mounting bracket/exible hose
• Technical/user product literature
In any situation where the volume of heated pipework (eg. secondary circulation
pipes or manifold pipework for multiple units) exceeds 10 litres, then an
additional expansion vessel must be tted to accommodate the extra expansion
volume.
Handling Before Installation
Stainless Lite must be handled with care and stored the correct way up in a dry place.
Any manual handling/lifting operations will need to comply with the requirements
of the Manual Handling Operations Regulations issued by the H.S.E. The appliance
can be moved using a sack truck on the rear face although care should be taken and
the route should be even. In apartment buildings containing a number of storeys we
would recommend that the appliances are moved vertically in a mechanical lift. If it is
proposed to use a crane, expert advice should be obtained regarding the need for
slings, lifting beams etc.
A specic manual handling assessment is shown in Appendix B at the rear of this
manual.
DESIGN
DESCRIPTION

Page 4
L
H
K
N
D
F
J
A
I
G
M
C
E
40
,00
º
45,00º
35,00º
2
5,
0
0º
15
,0
0
º
NOTES
1. Not all models - see
table 1.
2. Recovery times based
on Primary Coil/I.H. duty
(ie. assumes the heat
pump / solar output is
adequate).
3. All connections
are supplied with
compression ttings
for direct connection to
copper pipework.
1. Measured at 0.25 l/s primary ow rate 2. Measured at 0.25 l/s primary ow rate and at 82°C ow temperature
Table 1
Stainless Lite HP SOL Model HP180INDSOL HP210INDSOL HP250INDSOL HP300INDSOL HP400INDSOL
Capacity - total volume litres 180 210 250 300 400
Volume heated by IH litres 113 135 160 195 270
Dedicated solar volume litres 65 75 90 105 130
Standing heat loss rate kWh/24h 1.48 1.70 1.85 2.04 2.82
Weight - empty/full kg 33/213 38/248 43/293 49/349 61/461
Pressure regulating valve setting bar 3 3 3 3 3
Expansion relief valve setting bar 4.75 4.75 4.75 4.75 4.75
Temperature setting (P&T valve) °C 95 95 95 95 95
Pressure setting (P&T valve) bar 6.0 6.0 6.0 6.0 6.0
Expansion vessel size (volume) litres 18 24 24 35 2 x 24
Expansion vessel initial charge pressure bar 3 3 3 3 3
Height A mm 1305 1495 1745 1992 2030
Diameter B mm 550 550 550 550 630
22mm secondary return C mm - 1127 1377 1577 1592
22mm compression cold feed D mm 442 442 522 522 557
P & T valve E mm 1053 1241 1491 1720 1784
22mm solar return - bottom coil F mm 223 223 223 223 238
22mm solar ow - bottom coil G mm 352 352 472 472 548
28mm primary return - top coil H mm 467 542 647 742 641
28mm primary ow - top coil I mm 1072 1232 1467 1562 1791
Dual CT & OHT pocket - 1 top J mm 732 837 962 1092 1076
Dual CT & OHT pocket - 2 bottom K mm 419 419 539 539 651
Solar sensor pocket - 1 top L mm 882 1000 1180 1367 1382
Solar sensor pocket - 2 bottom M mm 203 203 262 262 334
3kW immersion heater height N mm 457 522 607 702 640
Surface area of solar heater coil m20.68 0.68 0.97 0.97 1.27
Solar coil pressure loss 1bar 0.191 0.191 0.241 0.241 0.31
Primary heat exchanger surface area m21.36 1.56 1.94 2.04 2.91
Primary heat exchanger thermal rating 1kW 24.3 26.2 27.5 34.2 47.2
Primary heat exchanger pressure loss 1bar 0.048 0.054 0.060 0.019 0.027
Heat up time from 15°C to 60°C 2min 33 41 44 48 49
Recovery time after 70% draw-o 2min 21 26 30 32 38
DESIGN
DESCRIPTION

Page 5
DESIGN
TECHNICAL INFORMATION
D
E
E
F
A
B
G
H
C
180 to 300 Models 400 Model
27,5°
-Stat1
52,5°
-ColdFeed&Stat2(+SecRtnifFitted)
15,0°
-P&T
40,0°
-CoilFlow&Return
52,5°
-ColdFeed,Stat2&Sec.Rtn
27,5°
-Stat1
15,0°-P&T
40,0°
-CoilFlow&Return
NOTES
1. Recovery times base on Primary Coil/I.H. duty (ie. assumes the heat pump output is adequate).
1. Measured at 0.25 l/s primary ow rate 2. Measured at 0.25 l/s primary ow rate and at 55°C ow temperature
Table 2
StainlessLite HP Model HP180IND HP210IND HP250IND HP300IND HP400IND
Capacity - total volume litres 171 212 251 292 390
Volume heated by IH litres 158 199 238 279 372
Standing heat loss rate kWh/24h 1.48 1.70 1.85 2.04 2.82
Weight - empty/full kg 33/204 38/250 43/294 58/350 62/452
Pressure regulating valve setting bar 3 3 3 3 3
Expansion relief valve setting bar 4.75 4.75 4.75 4.75 4.75
Temperature setting (P&T valve) °C 95 95 95 95 95
Pressure setting (P&T valve) bar 6.0 6.0 6.0 6.0 6.0
Expansion vessel size (volume) litres 18 24 24 35 2 x 24
Expansion vessel initial charge pressure bar 3 3 3 3 3
Height mm 1305 1493 1743 1990 2030
Diameter mm 550 550 550 550 630
Hot Supply A mm 1352 1540 1790 2035 2080
P & T valve B mm 1047 1235 1485 1731 1784
22mm secondary return C mm - 1127 1377 1577 1577
28mm primary ow D mm 1043 1230 1250 1270 1660
Control stat E mm 440 494 577 677 668
28mm primary return F mm 273 260 280 300 330
Cold feed G mm 258 258 258 258 285
3kW immersion heater H mm 217 217 217 217 245
Primary heat exchanger surface area 1m22.5 3 3 3 4
Primary heat exchanger thermal rating 1kW 16.74 17.91 15.93 13.18 18.87
Primary heat exchanger pressure loss 1bar 0.04 0.05 0.06 0.05 0.07
Heat up time from 15°C to 50°C 2min 18.02 20.47 31.57 42.5 37.1
Average domestic hot water temperature 1min 46.95 46.77 48.44 42.06 47.32

Page 6
DESIGN
TECHNICAL INFORMATION
A
C
I
D
N
K
J
H
E
3,00°
P&T
33,00°
ColdFeed
62,00°
Stat2
Immersion
52,00°
Sec.Rtn@
37,00°
CoilConnections
NOTES
1. Not all models - see
table 2.
2. Recovery times based
on Primary Coil/I.H.
duty (ie. assumes the
heat pump output is
adequate).
3. All connections
are supplied with
compression ttings
for direct connection to
copper pipework.
1. Measured at 0.25 l/s primary ow rate 2. Measured at 0.25 l/s primary ow rate and at 82°C ow temperature
Table 3
Stainless Lite HP Slimline Model HP180SL HP210SL
Capacity - total volume litres 180 210
Volume heated by IH litres 170 200
Dedicated solar volume litres - -
Standing heat loss rate kWh/24h 2.01 2.23
Weight - empty/full kg 33/213 37/247
Pressure regulating valve setting bar 3 3
Expansion relief valve setting bar 4.75 4.75
Temperature setting (P&T valve) °C 95 95
Pressure setting (P&T valve) bar 6.0 6.0
Expansion vessel size (volume) litres 18 24
Expansion vessel initial charge pressure bar 3 3
Height A mm 1790 1970
Diameter B mm 475 475
22mm secondary return C mm - 1540
22mm compression cold feed D mm 283 283
P & T valve E mm 1535 1706
22mm solar return F mm - -
22mm solar ow G mm - -
28mm primary return H mm 275 285
28mm primary ow I mm 1545 1585
HP control thermostat J mm 628 699
Dual CT & OHT pocket K mm 628 699
Solar sensor pocket - 1 top L mm - -
Solar sensor pocket - 2 bottom M mm - -
3kW immersion heater height N mm 207 212
Surface area of solar heater coil m2--
Solar coil pressure loss 1bar - -
Primary heat exchanger surface area m23.01 3.01
Primary heat exchanger thermal rating 1kW 32.8 31.2
Primary heat exchanger pressure loss 1bar 0.018 0.018
Heat up time from 15°C to 60°C 2min 33 41
Recovery time after 70% draw-o 2min 21 26

Page 7
7
9
3
11
2
9
6
12
13
1
8
4
5
10
Stainless Lite HP SOL
Basic Appliance
1. Hot water draw o (22mm) compression
2. Lift up temperature & pressure relief valve
92-95°/6 bar
3. Hot water secondary return 22mm
(not tted to smaller sizes, see table 1)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply
6. Thermostat pocket (22mm)
7. Primary return (28mm)
8. Primary ow (28mm)
9. Dual control/Overheat stat & solar
thermostat pocket
10. Solar coil return to panel collector (22mm)
compression
11. Solar coil ow from panel (22mm) compression
12. Solar thermostat pocket
13. Drain o
Part G3 loose components supplied in a
separate box’
A. Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat (x2)
E. Two port (28mm) zone valve for
primary circuit
F. Wiring junction box for primary system
Typical arrangement of component kit shown tted to the appliance for clarity
Pipework to be supplied and tted by installer.
DESIGN
SYSTEM DESIGN

Page 8
DESIGN
SYSTEM DESIGN
3
1
2
5
6
4
5
7
8
Stainless Lite HP
Basic Appliance
1. Hot water draw o (22mm compression)
2. Lift up temperature & pressure relief valve
(1/2”female)
3. Hot water secondary return (22mm
compression)
(not tted to smaller sizes, see table 1)
4. Primary ow (28mm plain pipe)
5. Control stat
6. Primary return (28mm plain pipe)
7. Cold feed (22mm compression)
8. Immersion heater 1¾” BSP 3kW
Part G3 loose components supplied in a
separate box’
A.
Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat
E. Two port (28mm) zone valve for
primary circuit
F. Wiring junction box for primary system
Typical arrangement of component kit shown tted to the appliance for clarity
Pipework to be supplied and tted by installer.

Page 9
6
3
9
2
1
8
4
5
7
Stainless Lite HP Slimline
Basic Appliance
1. Hot water draw o (22mm) compression
2. Lift up temperature & pressure relief valve
92-95°/6 bar
3. Hot water secondary return 22mm
(210 litre model only)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply
6. Primary return (28mm)
7. Primary ow (28mm)
8. Dual control/Overheat stat
9. HP control thermostat
Part G3 loose components supplied in a
separate box’
A. Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat
E. Two port (28mm) zone valve for
primary circuit
F. Wiring junction box for primary system
Typical arrangement of component kit shown tted to the appliance for clarity
Pipework to be supplied and tted by installer.
DESIGN
SYSTEM DESIGN

Page 10
Stainless Lite is a range of unvented hot water storage cylinders, manufactured in
the latest high quality duplex stainless steel. They are designed to provide mains
pressure hot water and are supplied as a package which complies with Section G3 of
the Building Regulations. The appliance is extremely well insulated using high density
HCFC free foam insulation with an ozone depleting potential (ODP) of zero and a global
warming potential (GWP) of 1. It is tted with all necessary safety devices and supplied
with all the necessary control devices to make installation on site as easy as possible.
Stainless Lite Heat Pump (HP) SOL models:
The Stainless Lite HP SOL is an unvented hot water storage cylinder tted with two
high eciency internal primary heat exchangers especially designed for use with
heat pump systems. These two heat exchangers must be connected in parallel to
the heat pump circuit when a solar thermal system is not installed, as shown in the
schematic on page 16. When both heat pump and solar thermal systems are installed,
the top heat exchanger is connected to the heat pump circuit and the bottom heat
exchanger is connected to the solar circuit a shown in gure 2.
All Stainless Lite HP SOL models are tted with 3kW (230Vac, 50Hz) immersion heater
for raising the temperature of the stored water to above 60°C after the heat pump
heating cycle if necessary. During commissioning the actual temperature that the
cylinder reaches when the thermostat(s) operate should be tested and adjusted so that
it achieves a minimum of 60°C in order to comply with the Legionella pasteurisation
requirements.The technical details of the Stainless Lite HP models are listed in table 1.
Important notes:
1. All Stainless Lite HP models are suitable for both open vented and sealed primary
systems.
2. When used with a sealed primary heating system, the heat pump must incorporate
its own over heat thermostat.
3. Stainless Lite HP models must not be used with solid fuel boilers or steam as the
heat source.
4. Heat pumps can normally only heat the domestic hot water to between 45 – 50°C,
therefore provision should be made to periodically heat the cylinder to above 60°C
to prevent growth of legionella.
5. The cold supply elbow c/w drain tapping must be tted as shown in gures 1 &
2. A exible hose can then be connected to the drain tapping and providing the
hose runs below the lowest level of the cylinder, then all the water content can
be drained out by the symphonic action.
Stainless Lite Heat Pump (HP) and Slimline models:
The Stainless Lite HP and Slimline cylinders unvented hot water storage cylinders tted
with a high eciency coil. The coil has a low pressure loss due to it being a multiple
pass coil which enable high ow rates to be achieved through it. In addition due to
the coil being corrugated the heat transfer rate is higher than that of plain tube coil.
The cylinder has been specically designed for heat pump applications. It incorporates
an immersion heater at the base of the unit which enables pasteurisation of the water.
This should be done on a regular basis in line with HWA guidance..
The slimline has been designed to enable it to t into tighter locations.

Page 11
General Design Considerations
The cupboard footprint needs to be at least 650mm square for units up to 300 litres,
730mm for 400 litre units.
The base chosen for the cylinder should be level and capable of supporting the weight
of the unit when full of water as shown in General Data. The discharge pipework for the
safety valves must have a minimum fall of 1 : 200 from the unit to a safe discharge point. All
exposed pipework and ttings on the cylinder should be insulated, and the unit should
NOT be xed in a location where the contents could freeze.
In new systems, pipes should be insulated to comply with building regs, the maximum
permissible heat loss is indicated in the table opposite, and labelled accordingly as follows:
i. Primary circulation pipes for domestic hot water circuits should be insulated
through their length, subject only to practical constraints imposed by the need
to penetrate joists and other structural elements.
ii. All pipes connected to hot water storage vessels, including the vent pipe, should
be insulated for at least 1 metre from their points of connection to the cylinder (or
they should be insulated up to the point where they become concealed).
In replacement systems, whenever a boiler or hot water storage vessel is replaced in
an existing system, any pipes that are exposed as part of the work or are otherwise
accessible should be insulated as recommended for new systems, or to some lesser
standard where practical constraints dictate.
I.V.
Combination Valve
I.V.
If two Stainless Lites are coupled together the secondary inlet and outlet pipes must
be balanced. The units must be tted on the same level.
Note: No valves must be tted between the expansion vessel and the storage
cylinder(s).
INSTALLATION
INSTALLATION
The pipe connecting the boiler ow to the
appliance must not be less than 22mm
copper or equivalent.
Further guidance on converting heat loss limits
to insulation thickness for specific thermal
conductivities is available in TIMSA “HVAC
guidance for achieving compliance with Part L
of the Building Regulations”.
Mains Water Supply
Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure
is good, but should be confined to single
bathroom properties. For new properties where
simultaneous demand is required to more than
one bathroom or a bathroom and one or more
en-suites, the communication and service pipe
into the dwelling should be a minimum of 22mm
(usually in the form of a 25mm MDPE supply).
The optimum performance is achieved if the inlet
pressure is 3 bar dynamic. However, the Stainless
Lite will function with lower inlet pressures, but
this will reduce the performance. There should
be a ow of at least 30 litres per minute or above
available into the property. Normally Stainless
Lite provides well in excess of 40 litres/min
in most conditions. Flow rates for ALL mains
pressure systems are subject to district pressures
and system dynamic loss. Particularly on larger
properties with more than one bathroom, the
pipe sizes should be calculated in accordance
with BS EN 806-3:2006 and BS 8558:2011.
Insulation of pipework
Pipe outside
diameter
Maximum
heat loss
15mm 7.89W/m
22mm 9.12W/m
28mm 10.07W/m
35mm 11.08W/m

Page 12
INSTALLATION
Model Selection
The suggested model sizes shown in the table
opposite are based on a typical daily hot water
usage and on the assumption that the heat
pump will heat the domestic hot water to about
50°C. For higher specication, an increase of one
model size should be considered.
When selecting a solar model, it is important to
check the dedicated solar volume shown in table
1 is suitable for the total oor area of the dwelling
and/or net area of the solar collectors to ensure
compliance with the Building Regulations.
When sizing the hot water cylinder, please use
MCS guidelines in MIS3005 and also refer to BS
EN 806:1-5 AND BS EN 8558.
When Stainless Lite HP SOL is connected to both
heat pump and solar thermal systems, then
during the winter period the solar contribution
will be negligible and the heat pump will only
heat about 65% of the cylinder volume. This
should be taken into account when selecting
the model.
Please note that the two heat exchangers
must be connected in parallel to the heat
pump circuit when a solar thermal system is
not installed, as shown in the schematic below.
Stainless Lite HP SOL and HP Model Selection Guide
Dwelling type Suggested model
Number of
bedrooms
Number of
bathrooms and
shower rooms
Without solar
heating system (1)
With solar heating
system (2)
1-3 1 bathroom HP180INDSOL
HP180IND
HP180INDSOL
(FA=50m2)
2-3 1 bathroom +
1 shower room
HP180INDSOL
HP180IND
HP210INDSOL
(FA=65m2)
2-3 1 bathroom +
2 shower rooms
HP180INDSOL
HP180IND
HP250INDSOL
(FA=85m2)
2-4 2 bathrooms +
1 shower room
HP210INDSOL
HP210IND
HP300INDSOL
(FA=110m2)
2-4 2 bathrooms +
2 shower rooms
HP250INDSOL
HP250IND
HP400INDSOL
(FA=150m2)
3-5 2 bathrooms +
2 shower rooms
HP300INDSOL
HP300IND –
4-5 2 bathrooms +
3 shower rooms
HP400INDSOL
HP400IND –
Notes
1 Where solar model selected, both top and bottom heat exchangers connected to heat
pump circuit
2 Top heat exchanger connected to heat pump circuit and bottom heat exchanger
connected to solar circuit.
3 FA= Maximum oor area of the dwelling for compliance with the Building Regulations
Stainless Lite HP Slimline Model Selection Guide
Dwelling type Suggested model
Number of
bedrooms
Number of
bathrooms and
shower rooms
1-3 1 bathroom HP180SL
2-3 1 bathroom +
1 shower room HP180SL
2-3 1 bathroom +
2 shower rooms HP180SL
2-4 2 bathrooms +
1 shower room HP210SL
INSTALLATION
Stainless Lite HP SOL model without
solar heating system
P&T Relief Valve
Tundish
Hot Outlet
To Drain
PRV
ERV NRV
Stop
Tap
Kitchen
Cold
Tap
Combination
Valve
Balanced
Cold
Outlets
Expansion
Vessel
Heat Pump
Return
Secondary
Return Circuit
Non Return
Valve
Pump
Heat Pump
Flow

Page 13
INSTALLATION
Stainless Lite HP/Heat Pump Selection Guide
The table above can be used to match heat pumps to heat pump cylinders.
To use, first obtain the maximum flow rate from the heat pump manufacture’s
instructions, match this to the ow rates in section 1 and follow this ow rate’s column
down through the other sections.
Section 2 shows the velocity in the pipe work of dierent diameters at this ow rate. A
maximum ow velocity of 1m/s has been chosen to limit ow noise. Use this section to
choose the correct pipe diameter.
Stainless Lite HP/Heat Pump Selection Guide
1 - Flow rates in various units for comparison with heat pump manufacturers data
m3/h 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25
l/min 8.33 12.50 16.67 20.83 25.00 29.17 33.33 37.50 41.67 45.83 50.00 54.17 58.33 62.50 66.67 70.83
l/sec or kg/s 0.14 0.21 0.28 0.35 0.42 0.49 0.56 0.63 0.69 0.76 0.83 0.90 0.97 1.04 1.11 1.18
2 - Velocity in pipe (limited to 1 m/s maximum) for pipe sizing
m/s in 22mm 0.37 0.55 0.73 0.91 - - ----------
m/s in 28mm 0.23 0.34 0.45 0.56 0.68 0.79 0.90 ---------
m/s in 35mm 0.14 0.22 0.29 0.36 0.43 0.51 0.58 0.65 0.72 0.79 0.87 0.94 - - - -
m/s in 42mm 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85
3 - Operating power of heat exchanger suitable for cylinder based on a 5 degree temperature dierence
kW @ 5K dt 3-4 4-6 5.5-8 7-10 8-12 10-14 11-16 13-18 14-20 16-22 17-24 18-26 20-28 21-30 23-32 24-34
180HP ----------
180HP + Sol ------
180HP Slim ----------
210HP ---------
210HP + Sol -----
210HP Slim ---------
250HP ---------
250HP + Sol -----
300HP -----
300HP + Sol -
400HP -----
400HP + Sol -
4 - Pressure loss (bar) for each ow rate above in the available coil combinations
180HP 0.010 0.027 0.053 0.092 0.143 0.207 0.286 0.381 0.491 0.618 0.763 0.927 1.109 1.310 1.532 1.774
180HP + Sol 0.003 0.008 0.017 0.031 0.049 0.073 0.103 0.140 0.183 0.234 0.292 0.359 0.434 0.518 0.612 0.715
180HP Slim 0.004 0.010 0.018 0.030 0.044 0.062 0.083 0.108 0.136 0.167 0.202 0.241 0.283 0.329 0.379 0.432
210HP 0.017 0.040 0.074 0.118 0.173 0.239 0.316 0.405 0.505 0.617 0.741 0.877 1.025 1.184 1.356 1.540
210HP + Sol 0.013 0.033 0.064 0.107 0.164 0.234 0.318 0.417 0.532 0.663 0.810 0.975 1.156 1.356 1.574 1.810
210HP Slim 0.004 0.010 0.018 0.030 0.044 0.062 0.083 0.108 0.136 0.167 0.202 0.241 0.283 0.329 0.379 0.432
250HP 0.006 0.015 0.028 0.045 0.067 0.093 0.124 0.159 0.200 0.245 0.295 0.350 0.410 0.475 0.545 0.620
250HP + Sol 0.004 0.011 0.021 0.036 0.054 0.077 0.105 0.138 0.176 0.218 0.267 0.321 0.380 0.445 0.517 0.594
300HP 0.008 0.019 0.036 0.058 0.086 0.120 0.160 0.206 0.259 0.318 0.384 0.457 0.536 0.623 0.716 0.816
300HP + Sol 0.004 0.014 0.031 0.058 0.098 0.152 0.223 0.312 0.421 0.553 0.708 0.890 1.100 1.339 1.610 1.915
400HP 0.004 0.010 0.018 0.030 0.044 0.062 0.083 0.108 0.136 0.167 0.202 0.241 0.283 0.329 0.379 0.432
400HP + Sol 0.008 0.018 0.031 0.049 0.070 0.094 0.123 0.155 0.190 0.230 0.273 0.319 0.370 0.423 0.481 0.542
INSTALLATION
Section 3 shows the maximum operating power
of the coils in the cylinder. Shaded squares show
the range of operating powers suitable for a
cylinder in either of its set ups.
Section 4 shows the pressure loss across the
coils at this ow rate for all cylinders in both
congurations.

Page 14
INCOMING COLD SUPPLY
M
DC
DC
DC
TO
EXTERNAL
TAP
SINK
WATER SOFTENER (IF NECESSARY)
WM or DWM
WHB W.C.
DC
DC
SH
DHW
WHB
WC BATH
SCV SCV
P&T
ERV/NRV
PRV
DCV
Note:
Cold supplies to single taps must be
taken from the mains cold water
system.
Cold supplies to mixer taps must be
taken from the balanced cold water
connection on the combination
valve.
General Restrictions
a. The highest hot or cold water draw o point should not exceed 10 metres above
the Pressure Reducing Valve.
b. An ascending spray type bidet or any other appliance with a Class 1 back-syphonage
risk requiring a type A air gap should not be used.
c. Stainless Lite should not be used where steam is the primary heating medium, or
in a situation where maintenance is likely to be neglected.
d. Unvented cylinders are not suitable for use with solid fuel boilers.
e. If the supply to the mixer ttings (other than a dual outlet type) is not taken
from the balanced supply the system will become over pressurized and cause
the pressure relief valve to discharge. Over time this could also cause the
premature failure of the appliance itself which will not be covered by the
warranty.
f. In larger properties with a number of bathrooms/en-suites and long pipe runs
we would recommend that the balance cold supply is provided with its own
pressure reducing valve and is not taken from the balanced cold connection on
the combination valve. In this case it will also be necessary to t a small expansion
vessel on the balanced cold water system to accommodate the pressure rise caused
by the increase in temperature of the balanced cold water.
g. Check the performance requirements of the terminal ttings with regard to ow/
pressure are suitable.
Shower Fittings
Aerated taps are recommended to prevent splashing. Any type of shower mixing valve
can be used as long as both the hot and cold supplies are mains fed. However, all
mains pressure systems are subject to dynamic changes particularly when other hot
and cold taps/showers are opened and closed, which will cause changes in the water
temperature at mixed water outlets such as showers. For this reason and because
these are now no more expensive than a manual shower we strongly recommend
the use of thermostatic showers with this appliance. These must be used in 3 storey
properties where the impact on pressure/temperature of opening another tap in the
system is greater than normal. The shower head provided must also be suitable for
mains pressure supplies.
Pipe Layout
In all mains pressure installations it is important
to remember that the incoming cold supply
must be shared between all terminal ttings. It
is important that a 22mm supply is brought to
the appliance and a 22mm take-o is continued
at least to the bath. If there are two baths, 28mm
pipework should be considered. One metre of
smaller diameter pipework, or ow restrictors,
should be provided on the nal connection to
all outlets so as to balance the water available.
In any event the distribution pipework should
generally be in accordance with BS EN 806-1 to 5.
Plastic Pipework
This appliance is suitable for use with
plastic pipework as long as the material
is recommended for the purpose by the
manufacturer and is installed fully in accordance
with their recommendations.
Secondary Hot Water Circulation
Some models are fitted with a secondary
return tapping as standard (see table 1 for
details). If tted, an extra expansion vessel
may be necessary. A non-return valve MUST
be FITTED near the return connection. No valve
or terminal tting should be installed between
the non return valve and the cylinder. (See
schematic arrangement on page 13.) All pipes
kept hot by the secondary circulation should
be insulated.
INSTALLATION
INSTALLATION

Page 15
15 mm
discharge
pipe
Expansion
relief valve
Typical Discharge Pipe Arrangement
Dotted line showing
alternative route with
single tundish being used
600 mm max.
P & T
Relief
Valve
300 mm
min.
22 mm metal pipe with continuous
fall up to 9m equivalent length (D2).
NOTES:
The discharge will consist of scalding
waterand steam. Asphalt, roofing felt
and non-metallic rainwater goods may
be damaged by such discharges.
It is not acceptable to discharge straight
into a soil pipe.
Discharge below
fixed grating
Fixed Grating
Trapped gully
Pressure & Temperature/expansion Relief
Valve Pipework
The relief valve should be installed to discharge
in accordance with G3 of the Approved
Document of the Building Regulations and
should be piped to where it is visible, but will
not cause danger to persons or damage to
materials.
The following information is taken from
Approved Document G3 of the Building
Regulations and is provided to assist with
the design and installation of the discharge
pipework. However, the information is not
exhaustive and reference should always be
made to Approved Document G3 of the Building
Regulations. The nal decision regarding any
arrangements rests with Building Control and
it is recommended that their advice is sought
if you have any concerns regarding this aspect
of the installation.
The two safety valves will only discharge
water under fault conditions. When operating
normally water will not be discharged.
The tundish should be vertical, located in the
same space as the unvented hot water storage
system and be tted as close as possible and
within 600mm of the safety device e.g. the
temperature relief valve.
The discharge pipe (D2) from the tundish should
terminate in a safe place where there is no risk
to persons in the vicinity of the discharge, be
of metal and:
a) Be at least one pipe size larger than the
nominal outlet size of the safety device unless
its total equivalent hydraulic resistance
exceeds that of a straight pipe 9m long
i.e. discharge pipes between 9m and 18m
equivalent resistance length should be at
least two sizes larger than the nominal outlet
size of the safety device, between 18 and
27m at least 3 sizes larger, and so on. Bends
must be taken into account in calculating
the ow resistance. Refer to the table and
the worked example.
An alternative approach for sizing discharge
pipes would be to follow BS EN 806-2:2005
Specication for design installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages.
b) Have a vertical section of pipe at least
300mm long, below the tundish before any
elbows or bends in the pipe work.
c) Be installed with a continuous fall.
Worked Example
The example below is for G1/2 temperature relief valve with a discharge pipe (D2)
having 4 elbows and length of 7m from the tundish to the point of discharge.
From Table 1:
Maximum resistance allowed for a straight length of 22mm copper discharge
pipe (D2) from a G1/2 temperature relief valve is: 9m subtract the resistance for
4 x 22mm elbows at 0.8m each = 3.2m.
Therefore the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2
temperature relief valve equates to: 14m.
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Table 1: Sizing of copper discharge pipe‘D2’ for a temperature relief
valve with a G1/2 outlet size (as supplied)
Size of discharge
pipework
Maximum length of
straight pipe
(no bends or elbows)
Deduct the gure
below from the
maximum length for
each bend or elbow in
the discharge pipe
22mm Up to 9m 0.8m
28mm Up to 18m 1m
35mm Up to 27m 1.4m
INSTALLATION
INSTALLATION

Page 16
d) It is preferable for the discharge to be visible at both the tundish and the nal point
of discharge but where this is not possible or practically dicult there should be
clear visibility at one or other of these locations. Examples of acceptable discharge
arrangements are:
1. Ideally below the xed grating and above the water seal in a trapped gulley.
2. Downward discharges at a low level; i.e. up to 100mm above external surfaces
such as car parks, hard standings, grassed areas etc are acceptable providing
that where children play or otherwise come into contact with discharges, a
wire cage or similar guard is positioned to prevent contact whilst maintaining
visibility.
3. Discharges at a high level; e.g. into metal hopper and metal down pipe with the
end of the discharge pipe clearly visible (tundish visible or not) or onto a roof
capable of withstanding high temperature discharges of water and 3m from
any plastic guttering systems that would collect such discharges.
4. Where a single pipe serves a number of discharges, such as in blocks of ats,
the number served should be limited to not more than 6 systems so that any
installation can be traced reasonably easily. The single common discharge pipe
should be at least one pipe size larger than the largest individual discharge pipe
to be connected. If unvented hot water storage systems are installed where
discharges form safety devices may not be apparent i.e. in dwellings occupied by
blind, inrm or disabled people, consideration should be given to the installation
of an electronically operated device to warn when discharge takes place.
Safety
The safety devices supplied or tted on an Stainless Lite are selected for their suitability
for the temperatures and pressures involved. They must not be changed, removed or
by-passed and it is essential that only genuine replacement parts supplied or approved
by Gledhill Building Products Limited are used. This includes the immersion heaters,
which must incorporate an energy cut-out. All parts are available to approved installers
from Gledhill Building Products Limited, Sycamore Estate, Squires Gate, Blackpool
(Telephone [phone]).
Combination Inlet Group
Combines elements 1, 2 and 3 below.
1. Pressure Reducing Valve - This must be xed near the cylinder. The cold water supply
to any mixer taps/showers must be taken from the cold water tapping of this valve
to ensure balanced hot and cold pressures. This valve is factory set to ensure the
correct operating pressure for the Stainless Lite.
2. Non Return Valve - This is integral with the pressure reducing valve to prevent
backow of hot water towards cold water draw o points.
3. Cold Water Expansion Relief Valve - This safety device is preset at the factory and
will relieve excess cold water pressure resulting from a fault condition.
Stainless Lite HP SOL model without
solar heating system
P&T Relief Valve
Tundish
Hot Outlet
To Drain
PRV
ERV NRV
Stop
Tap
Kitchen
Cold
Tap
Combination
Valve
Balanced
Cold
Outlets
Expansion
Vessel
Heat Pump
Return
Secondary
Return Circuit
Non Return
Valve
Pump
Stainless Lite HP SOL model with
solar heating system
Secondary
Return Circuit
Heat Pump
Flow
P&T Relief Valve
Tundish
Hot Outlet
Mixed Hot
Water Out
To Drain
PRV
ERV NRV
Stop
Tap
Kitchen
Cold
Tap
Combination
Valve
Balanced
Cold
Outlets
Expansion
Vessel
Heat Pump
Return
Solar Return
Solar Flow
Non Return
Valve
Pump
Heat Pump
Flow
Stainless Lite HP & Slimline model
without solar heating system
P&T Relief Valve
Tundish
Hot Outlet
To Drain
PRV
ERV NRV
Stop
Tap
Kitchen
Cold
Tap
Combination
Valve
Balanced
Cold
Outlets
Expansion
Vessel
Heat Pump
Return
Secondary
Return Circuit
Non Return
Valve
Pump
Heat Pump
Flow
INSTALLATION
INSTALLATION

Page 17
Lift up temperature/pressure relief valve
This safety device is also pre-set at the factory and relieves before the temperature
reaches 100°C. It is also a Pressure Relief Valve, and is pre-set to 6 bar.
Immersion Heater
All stainless Lite HP models are tted with a 3kW immersion heater so that the store
temperature can be raised above that which the heat pump provides, to boost the
hot water performance if necessary and to protect against legionella eg. once a day
or once a week.
These are 3kW 240V AC heaters and incorporate a thermostat and a manually reset
energy cut-out which operates at 85°C. They have incalloy elements to prolong their
life expectancy in aggressive water conditions.
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.
The correct method of terminating the wiring to the immersion heater is shown above.
Usage of the product in non-domestic commercial applications can be extremely
intensive and stressful to various components. We recommend that titanium
immersion heaters are fitted in such situations, rather than the incoloy heater
supplied as standard. Titanium immersion heaters oer superior strength, weight
and a smoother nish which enable them to better withstand the extreme stress
and temperature uctuation often encountered within non-domestic environments
and situations where water quality is poor – ensuring improved performance and
extended operational life.This can be purchased as an extra from your Gledhill depot
under code number SH002.
INSTALLATION
INSTALLATION
The operation of the boost immersion heater can
also be controlled by means of an independent
time switch as shown schematically below. The
‘ON’ time settings on the immersion heater
should be between 30 - 60 minutes later than
the‘ON’times set for the hot water programmer
channel.
For example if the hot water is programmed to
come on between 0600 - 0900 and 1700 - 2200
then the immersion heater setting should be
0640 - 0900 and 1740 - 2200. This will give hot
water heating by heat pump a priority.
Line Strainer
This is integral within the combination inlet
group to reduce the likelihood of contaminants
fouling the valve seat. Following installation
this line strainer must be cleaned and replaced.
This needs to be carried out on a regular basis.
as part of the annual maintenance/service
check.
Tundish
This is to allow the discharge from any Relief
Valve to be seen. It must be tted away from
any electrical devices. See page 13 for discharge
pipework details.
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.
Control/overheat Dual Thermostats
Care must be taken to ensure that the solar
probes are fully inserted into the pockets
provided.
Safety
Cut-out
Thermostat
Immersion Heater Wiring
E
L
N
Typical schematic wiring diagram for the boost immersion heater
using immersion programmable immersion heater timer.

Page 18
Schematic Open Vented Primary System (HP SOL)
Heat Pump
Pump
150mm max.
Warming/Overflow
Pipe
F & E Cistern
Minimum
distance as
required by
heat pump
manufacturers
instructions
Motorised Valve
Motorised Valve
(Energy cut-out)
Schematic Sealed Primary System (HP SOL)
Motorised Valve
Motorised Valve
(Energy cut-out)
Expansion
Vessel
Gauge
Safety Valve
Pump
Heat Pump
Schematic Open Vented Primary System (HP & Slimline)
Heat Pump
Pump
150mm max.
Warming/Overflow
Pipe
F & E Cistern
Minimum
distance as
required by
heat pump
manufacturers
instructions
Motorised Valve
Motorised Valve
(Energy cut-out)
Schematic Sealed Primary System (HP & Slimline)
Motorised Valve
Motorised Valve
(Energy cut-out)
Expansion
Vessel
Gauge
Safety Valve
Pump
Heat Pump
INSTALLATION
INSTALLATION
Heating And Primary Systems
Although the heat pump and the primary heating system should be sized and installed
in accordance with BS EN 12828:2003, BS EN 12831:2003 & BS EN 14336:2004 the
following should also be taken into account during the design and installation phase.
The heat pumps normally operate at lower ow temperatures; typically 45 – 55°C
compared with 75 – 80°C for the boilers. Therefore if traditional radiators are used
then, these should be oversized in accordance with the heat pump manufacturers
recommendations.
For optimum eciency (i.e. COP of a heat pump), low temperature under oor heating
system should be considered.
The heat pumps normally operate at lower temperature dierence between ow and
return compared with the traditional boilers and therefore when sizing the pipework
heat pump manufacturers recommendations should be taken into account.
Safety
Stainless Lite HP is tted with a combined temperature and pressure relief valve to
cope with any increase in temperature and pressure in the cylinder above the design
limits, when used with heat sources up to 45kW total output. This is the maximum
heat input to the cylinder allowed by section G3 of the ‘Approved Document G’ of
the Building Regulations.
The heat supply to the cylinder and hence the
temperature of the stored water should be
controlled as outlined below: -
• Heat supply from the primary heat source
i.e. heat
The 2-port spring return motorised valve
supplied should be tted adjacent to the unit
and controlled by the cylinder thermostat
(combined control and overheat thermostat)
supplied with the unit. The motorised valve
and the thermostat must be wired so that the
motorised valve switches o when either the
control thermostat contact breaks when the
set temperature is reached or the overheat
thermostat contacts break when an overheat
condition develops. The operation of the
heat source should be controlled via the
auxiliary switch of the motorised valve.
It is important to follow the wiring diagrams
in the wiring section of these instructions.

Page 19
Solar Heating System
Stainless Lite HP SOL is suitable for use with combined heat pump and solar thermal
heating systems. All components in a solar primary circuit must be marked or identied
in such a way that their design pressure and temperature can be readily determined
A safety device (pressure relief valve) to control the risk of over-pressure in system
components should be tted. A termination from a safety pressure device should
minimise the risk of damage to persons or materials. Suitable locations are a high
temperature receptacle, an internal gully or else issue externally at ground level. High
level termination from walls or on roofs could cause injury to people or animals below
if the valve were to release scalding water and steam.
The pipe leading to the safety device and the collector should be of rigid and non-
deformable construction, without any possibility of restriction or disclosure by any
other tted component. A more detailed diagram of our recommended arrangement
for a typical solar system is shown on page 15.
This provides all the necessary controls and safety devices necessary for the solar
system i.e. the two port zone valve is wired as an energy cut out and the pump/valve
will only allow heat transfer as required under control of the solar controller.
The pocket provided for the DualThermostat also includes the facility to accommodate
an 8mm diameter sensor which, with the sensor located in the solar collector (or in
the ow pipe immediately adjacent to the collector), will provide the information
required by the solar controller.
Stainless Lite HP system configuration with solar thermal heating system
Solar
pumping
station
Solar circuit
zone valve
Central heating
flow and return
Central heating zone valve
Heat pump
PRV
Expansion
vessel
Hot water zone valve
System pump
PRV
Primary circuit
sealed system kit
• Sealed heating system
A heat pump selected must be suitable for use in a sealed heating system which
may have working pressure of up to 3.0bar and it must be tted with an overheat
temperature cut-out device.
Unvented (i.e. sealed primary circuits may be lled or replenished by means of a
temporary connection between the circuit and a water supply pipe provided a
WRC ‘Listed’ double check valve and lling loop or some other no less eective
backow prevention device is permanently connected at the inlet to the circuit
and the temporary connection is removed after use.
Alternatively, a CA device can be used which will allow the system to be permanently
connected to the cold mains supply. The primary system can then be topped up,
when required, in the same way as an open
vented system tted with an F&E cistern.
• Open vented heating system
It is essential that the primary circuit
between the boiler and the Stainless Lite is
pumped and that the cold feed and open
vent connections are positioned to prevent
pump over into the feed and expansion
cistern and to ensure that the open vent is
correctly sized. A typical arrangement of the
open vented system is shown in diagram
opposite.
Note: If the motorised valve is not used then
any factory built hydraulic station for solar
use MUST be tted with suitable non-return
valves in both flow and return pipes to
prevent gravity circulation when the pump
is not running.
If there is a possibility of the solar controller that
you install causing the cylinder temperature to
exceed 80°C, under normal working conditions,
then a Solar tempering valve must be tted to
the domestic hot water outlet of the cylinder.
This must limit the hot water temperature to
a maximum of 60°C.(ref building regulations
part G3 3.63). This product can be supplied
from Gledhill part number XC007 which has
a inlet temperature limit of 100°C. Suitable
plumbing configurations for installing this
valve are shown on page 12 of this manual. NB.
Overheat thermostats may require resetting if
the solar thermal heat source raises the cylinder
temperature above 85°C.
INSTALLATION
INSTALLATION

Page 20
19876543210
12 3456 78
S1 S2 S3
201918171615141312
LNR1R2 NN
T
S1
S1
1 bar
Solar
Pumping
Station
Solar Coil
TWO PORT
ZONE VALVE
AB
C12C1
+ C
o
+ C
o
LN
230 VAC 5 amp
Mains Supply
Dual Thermostat
Gledhill Stainless Lite
Unvented Cylinder TAnti Gravity
Check Valve
Pressure
Relief Valve
Anti Gravity
Check Valve
Standard 10 way
wiring junction box
(Not supplied)
This valve must be fitted on
the return to the solar panels
and be suitable for higher
temperatures operation
(Not
supplied)
No isolation valve
should be installed
between the solar
circuit and the safety
valve (pressure relief
valve)
Solar Controller
Schematic Showing Solar Wiring Requirements
INSTALLATION
INSTALLATION