Heatrae Sadia R 45 PLUS 3KW User manual

R PLUS
Installation, operation and maintenance manual

2
Contents
1. Introduction ................................................................................................................................................... 3
1.1 General....................................................................................................................................................... 3
1.2 Symbols used............................................................................................................................................. 3
1.3 Abbreviations ............................................................................................................................................. 3
1.4 HWA Charter ............................................................................................................................................. 3
1.5 Tools required ............................................................................................................................................ 3
2. Safety.............................................................................................................................................................. 5
2.1 General safety warnings............................................................................................................................. 5
2.2 Recommendations ..................................................................................................................................... 5
2.3 Specic safety instructions ......................................................................................................................... 5
3. Technical specications ............................................................................................................................... 6
3.1 Technical data ............................................................................................................................................ 6
3.2 Overall Dimensions .................................................................................................................................... 7
3.3 Circuit Diagrams ........................................................................................................................................ 8
4. Description of the product ........................................................................................................................... 9
4.1 General description .................................................................................................................................... 9
4.2 Operation principle ..................................................................................................................................... 9
4.3 Standard delivery ...................................................................................................................................... 10
5. Before installation ......................................................................................................................................... 11
5.1 Installation regulations................................................................................................................................ 11
5.2 Installation requirements ............................................................................................................................ 11
5.4 Choice of location....................................................................................................................................... 11
5.5 Positioning and access............................................................................................................................... 11
6. Installation ..................................................................................................................................................... 13
6.1 General....................................................................................................................................................... 13
6.2 Wall xing ................................................................................................................................................... 14
6.3 Water connections...................................................................................................................................... 16
7. Commissioning ............................................................................................................................................ 18
7.1 General....................................................................................................................................................... 18
7.2 Checklist before commissioning................................................................................................................. 18
7.3 Commissioning procedure.......................................................................................................................... 18
8. Operation ...................................................................................................................................................... 19
8.1 General....................................................................................................................................................... 19
8.2 Overview .................................................................................................................................................. 19
8.3 Temperature adjustment............................................................................................................................. 19
9. Maintenance................................................................................................................................................... 20
9.1 General....................................................................................................................................................... 20
9.2 Routine inspection & maintenance operations – Water Heater Draining .................................................. 20
9.3 Routine inspection & maintenance operations – Filter Inspection.............................................................. 20
9.4 Routine inspection & maintenance operations – Water Sensor Inspection................................................ 21
9.5 Routine inspection & maintenance operations – Immersion Heater Inspection......................................... 22
9.6 Routine inspection & maintenance operations – System Overview........................................................... 24
10. Troubleshooting .......................................................................................................................................... 25
10.1 Fault Finding............................................................................................................................................. 25
10.2 Fault codes............................................................................................................................................... 26
11. Decommissioning........................................................................................................................................ 28
11.1 Decommissioning procedure .................................................................................................................... 28
11.2 Environmental Information........................................................................................................................ 28
12. Spares .......................................................................................................................................................... 29
12.2 Accessories ............................................................................................................................................. 30
13. Warranty ...................................................................................................................................................... 35

3
1. Introduction
1.1 General
The following instructions are offered as a guide to the
user and installer.
The installation must be carried out by a competent
plumbing and electrical installer in accordance
with Building Regulations, The Building Standards
(Scotland) Regulations 1990, The Building Regulations
(Northern Ireland), UK Water Regulations and IEE
Electrical Regulations.
1.2 Symbols used
In these instructions, various risk levels are employed
to draw the user’s attention to particular information. In
doing so we wish to safeguard the user, avoid hazards
and guarantee the correct operation of the appliance.
DANGER
Risk of a dangerous situation causing serious
physical injury.
WARNING
Risk of a dangerous situation causing slight
physical injury.
CAUTION
Risk of material damage.
 Signals important information.
1.3 Abbreviations
DHW - Domestic Hot Water
LED - Light Emitting Diode
ECO - Energy Cut Out
PCB - Printed Circuit Board
1.4 HWA Charter
The HWA Charter Code of Practice requires that, all
members adhere to the following:
`To supply t for purpose products clearly and
honestly described
`To supply products that meet, or exceed appropriate
standards and building and water regulations
`To provide pre and post sales technical support
`To provide clear and concise warranty details to
customers
1.5 Tools required
M5 security screw:
Torx Tamper Proof T25 bit
Used on base and sensor covers
M8 security screw:
Torx Tamper Proof T40 bit
Used on external brackets
M5
(Security)
M8
(Security)

4
1.6 Liabilities
Manufacturers liability
Our products are manufactured in compliance with
the requirements of the various applicable European
Directives.
This appliance complies with the requirements of the
CE marking directive and is Kiwa approved to show
compliance with Water and Building Regulations and
Nemko approved for electrical safety. In the interest of
customers, we try continually to improved product
quality.
All the specifications stated in this document are
therefore subject to change without notice. Our
liability as the manufacturer may not be invoked in the
following cases:
`Failure to abide by the instructions when using the
appliance.
`Faulty or insufcient maintenance of the appliance.
`Failure to abide by the instructions when installing
the product.
Installer's liability
The installer is responsible for the installation and the
commissioning of the appliance. The installer must
adhere to the following instructions:
`Read and follow the instructions given in the
manuals provided with the appliance.
`Carry out installation in compliance with the
prevailing legislation and standards.
`Perform the initial start up and carry out any
necessary checks.
`Complete the commissioning checklist.
`Explain the installation to the user.
`If maintenance is necessary, warn the user of the
obligation to check the appliance and maintain it in
good working order.
`Give all the instruction manuals to the user.
Users liability
To guarantee optimum operation of the appliance, the
user must adhere to the following instructions:
`Read and follow the instructions given in the
manuals provided with the appliance.
`Call on qualied professionals to carry out
installation and initial start up.
`Ask the installer to explain your installation to you.
`Have the required checks and services done.
`Keep the instruction manuals in good condition and
close to the appliance.
This appliance can be used by children aged from 8 years and above and persons with
reducedphysicalsensoryormental capabilities
or lack of experience and knowledge if they
have been given supervision or instruction
concerning use of the appliance in a safe
way and understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be
made by children without supervision.
Children must be supervised to ensure they
do not play with the appliance.
1.7 Benchmark
It is a requirement that the water heater is installed
and commissioned to the manufacturers instructions
and the data elds on the commissioning checklist
completed in full.
To instigate the warranty the vented water heater
needs to be registered with the manufacturer within
one month of the installation.
To maintain the warranty it is essential that the vented
water heater is serviced annually by a registered
engineer. The service details should be recorded on
the Benchmark Service Interval Record and left with
the owner/tenant of the property/building.
Visit: www.centralheating.co.uk for more information.
Heating and Hot Water Industry Council (HHIC)

5
2. Safety
2.1 General safety warnings
2.2 Recommendations
`Regularly check the inlet water pressure in the
installation (minimum dynamic pressure 0.5 bar,
recommended pressure between 1 and 2 bar).
`Keep the product accessible at all times
`Never remove cover labels and rating plates afxed
to the appliance.
A means for disconnecting the power supply must be
incorporated in the xed wiring in accordance with the
latest version of BS 7671
Figure 1: Drain valve found in base of unit
2.3 Specic safety instructions
CAUTION
`Ensure the drain valve is covered
securely with the supplied cap to
ensure accidental use does not occur.
WARNING
`Only competent persons having
received the appropriate training are
permitted to work on the appliance and
the installation
`Do not tamper with any of the controls
supplied with the unit.
`Before any work, isolate the mains
electrical and water supplies to the
appliance.
DANGER
The hot water contained could lead to serious
physical injury if the safety instructions in this
manual are not adhered to.
WARNING
When handling the unit, take appropriate
precautions for the weight of the unit. Weights
can be found in section 3, table 1 page 6.
CAUTION
Annual maintenance is recommended by a
competent person.

6
3. Technical specications
3.1 Technical data
Product Name R 25 PLUS 3KW R 45 PLUS 3KW R 70 PLUS 3KW R 120 PLUS 3KW
Product Code 94040010 94040011 94040012 94040013
Electrical Rating 2.8kW at 230V
3.0kW at 240V
2.8kW at 230V
3.0kW at 240V
2.8kW at 230V
3.0kW at 240V
2.8kW at 230V
3.0kW at 240V
Maximum inlet pressure 1MPa (10bar)
(145psi)
1MPa (10bar)
(145psi)
1MPa (10bar)
(145psi)
1MPa (10bar)
(145psi)
Weight Empty kg 15 20 35 40
Weight Full kg 40 65 105 160
Capacity (Litres) 25 45 70 120
Heat up time (minutes) 30 50 80 135
Fill time (minutes) 3.5 at 7L/min 4 at 7L/min 6 at 12L/min 10 at 12L/min
Table 1: Technical data
Table 2: Technical che
Technical parameters in accordance with European Commission regulations 814/2013 and 812/2013
Direct
Suppliers name or trade mark R PLUS
Supplier’s model identier 25L (3kW) 45L (3kW) 70L (3kW) 120L (3kW)
Storage volume V in litres 25.0 45.0 70.0 120.0
Mixed water at 40 °C V40 in litres 35 60 95.7 165.6
The declared load prole S M M M
The water heating energy efciency class of the model B C C C
The water heating energy efciency in % 35.1 37.7 36.1 36.6
The annual electricity consumption in kWh 526 1362 1423 1403
Daily fuel consumption Qlec in kWh 2.48 6.31 6.67 6.55
Heat Loss 0.56 0.84 1.12 1.27
The thermostat temperature settings of the water heater,
as placed on the market by the supplier 60OC
Specic precautions that shall be taken when the water
heater is assembled, installed or maintained See pages 7 to 27

7
3.2 Overall Dimensions
A
B
C
I
F
D
E
H
G
Item 25L 45L 70L 120L
A 830 882 1221 1021
B 510 609 609 660
C 380 425 425 457
D 74 76 76 76
E 204 245 245 396
F 235 276 276 429
G 180 220 220 362
H 148 188 188 325
I 415 463 463 562
Figure 2: General dimensions
Table 3: General dimensions

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3.3 Circuit Diagrams
s
s
Inlet
pipe work 1
Inlet
pipe work 2
Outer
case
H
N
W
L1
L2
L3
J5
Electronic control
L N
Thermistor
Solenoid valve
Element
Figure 3: Circuit diagram
Upper level sensor
Lower level sensor
Terminal block
Earth / ground
Thermal cutout
Thermostat
1
2
3
4
5
6
7
8
9
10
Potentiometer
Potentiometer
(Temperature control)
In Line Filter

9
Outer
case
4. Description of the product
4.1 General description
These water heaters are a series of wall mounted units
that store and produce domestic hot water efciently.
These vented units (unpressurized). mount securely
to the wall. Where required additional pressure safety
components may be added.
There are four models in the range:
`R 25 PLUS
`R 45 PLUS
`R 70 PLUS
`R 120 PLUS
The unit is supplied complete with safety and control
devices needed to allow connection to the cold water
supply where the pressure is below 10 bar. All these
components are preset and should not be tampered
with. The units' hot and cold pipes are situated so as
to provide ease of installation. The unit also has a
breather connection at the top that provides a visual
indication, via the tundish supplied, of overlling should
the unit fail. This must be vented to a suitable and safe
location, preferably an outside wall.
4.2 Operation principle
All the unit sizes produce DHW in the same way, by
heating the potable water volume via an immersion
heater. The hot water temperature programmed in the
unit is factory set to 60 degrees centigrade, but can
be adjusted to suit the installation requirements by
adjusting the temperature control at the bottom of the
unit under the access cover.
4.2.1 Temperature Control
The temperature of the stored water can be adjusted
between 38 degrees centigrade and 78 degrees
centigrade, this is achieved by adjusting the temperature
control at the bottom of the unit under the access cover,
see page 19.
4.2.2 Water inlet control
When hot water is drawn from the water heater, the unit
will detect a change in water level automatically and
request rell via a solenoid valve. The ow of potable
water is controlled via a ow restrictor, this ensures that
1
11 10 98
2
3
4
5
6
7
13
14
15
16
Number Part description
1 Product bracket
2 Breather gasket
3 Level sensor assembly
4 Sensor cover
5 Tank assembly
6 Main electronic control
7 Base cover
8 22mm hot outlet pipe
915mm water inlet (push t elbow)
10 Potentiometer
11 Securing bracket
12 Drain valve
13 Power cable clamp assembly
14 Inlet assembly
15 Immersion heater
16 Wall bracket
Figure 4: Main components diagram
Table 4: Main components list
12

10
the heater returns to the correct level in a controlled
manner.
4.2.3 Electronic Control
All heater functionality is controlled electronically which
allows the following additional features to be supported:
`Automatic Water Level Control
`Real-time user access to the heater for setup and
adjustment
`Automatic Pasteurization Control
4.2.3.1 Water Level
In normal operation the water heater manages the
level of the stored water inside the unit automatically,
maintaining the correct level and ensuring optimum
performance from the heater. In the unlikely event of a
system failure, the heater has safety features to ensure
that it shuts down in a safe manner, see troubleshooting
section on page 25.
4.2.3.2 Auto Pasteurization
The water heater will automatically heat the stored water
temperature to 60°C for one hour should the stored
water set point temperature be inadvertently set to 55°C
or less for a period of 23 hours. This pasteurization
function ensures that the risk of developing Legionella
within the water heater is minimized.
WARNING
`The stored water temperature during
this function exceeds that which is
safe for hand wash requirements, if
the stored hot water is used for hand
washing then an appropriate water
tempering device must be tted at the
point of use.
WARNING
`With the addition of this feature,
the obligation to control Legionella
under the provisions laid down by L8,
Legionnaires’ disease: The control
of legionella bacteria water systems.
Approved Code of Practice and
guidance, within the hot water supply
network pipe work are not negated. It is
still the responsibility of the end user or
contacted support agency to manage
this requirement.
4.2.3.3 Fault Condition Indication
In the unlikely event that a fault with the water heater
develops an error code is displayed on the control
PCB at the bottom of the unit. This is intended to aid
fault analysis and helps to reduce the heater downtime
whilst the fault is analysed. See the troubleshooting
section of this document for further information. One
of six error codes will be displayed using four LED,s
should a fault develop, see page 25.
4.3 Standard delivery
The units are supplied to site in one package. Within
the box there will be a set of tting instructions wall
mounting and xing brackets and breather pipe
assembly.

11
5. Before installation
5.1 Installation regulations
5.2 Installation requirements
The unit should not be used in association with any of
the following:
`Water supplies that have either inadequate
pressure or where the supply may be intermittent.
(Minimum dynamic pressure 0.5 bar).
`In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter
that could block the strainer, unless adequate
ltration can be ensured.
`In areas where the water supply contains chloride
levels that exceed 250mg/L.
For information or advice regarding any of the above
contact Technical Enquiries on: 0344 871 1535.
 The unit can be connected directly to the
water supply source provided that a minimum dynamic
pressure of 0.5 bar and maximum pressure of 10 bar.
If the measured inlet pressure exceeds this value then a
pressure reducing valve must be tted, this is available
through supply partners detail on back page.
5.3 Transport and storage
If the unit has to be stored prior to installation, it must be
in a secure area free from frost, excessive dampness
and humidity.
5.4 Choice of location
The unit must be vertically wall mounted the following
points should be considered:
The unit should be sited to ensure minimum dead leg
distances, particularly to the point of most frequent use.
However there should be a minimum height between
the hot water outlet and the highest draw off point,
outlet tap, of 1.2 meters.
Avoid installations where extreme cold temperatures
will be experienced. All exposed pipe work should be
insulated.
The breather pipe work from the top of the unit should
have a continuous fall, and ideally vent to an outside
wall in a safe manner via the tundish supplied.
Access to associated controls must be available for the
servicing and maintenance of the system, the heater
requires access from the front and underside for this
purpose, refer to gure 6 page 12. Ensure that the wall
the unit is mounted on, is perpendicular and capable
of permanently supporting the weight when it is full of
water see Table 1 on page 6 for the unit weights.
5.5 Positioning and access
It is important that as much access available is
provided around the unit as is practical. In the event
of a component failure, full access to the front and
underside of the unit is required for servicing. A
minimum of 150mm above the top of the unit must be
kept clear for access, refer to gure 6, page 12.
Access to all isolation valves and control valves in the
water circuits, both hot and cold are also required for
normal operation and servicing.
WARNING
Installation of the appliance must be carried
out by a qualied engineer in accordance
with prevailing and national regulations as
listed below.
`Building Regulations
`The Building Standards (Scotland)
`The Building Regulations (Northern
Ireland)
`I.E.E Electrical Regs
`UK Water Regulations
WARNING
`In the unlikely event that water from the
unit should vent from this breather pipe
then the water could be at an excessive
temperature exceeding 95 degrees.
Therefore it is essential that the
breather pipe work selected is capable
of withstanding this temperature and
must have no obstruction and allow free
and safe passage for this hot water.
CAUTION
`Ensure that the unit is correctly
positioned. Consideration should
be given to the access and space
requirements for operating and
servicing the unit.
 The breather pipe assembly at the top can be
positioned on either the left or right.
Figure 5: Breather pipe assembly

12
Figure 6: Clearance diagram
10
10
150
1000
80 A80 10
B
250
10 C
R 25L PLUS R 45L PLUS R 70L PLUS R 120L PLUS
A510 609 609 660
B830 882 1221 1020
C235 275 275 429
Table 5: Clearance dimensions

13
150
B
250
C
6. Installation
6.1 General
After reading sections 1 - 5 in this booklet please
install the unit paying attention to the following water
connection, electrical and commissioning sections.
6.1.1 Siting of the unit
These water heaters are vented and can supply
multiple hot water outlets. The units must be mounted
higher than the taps they supply, refer to gure 7 below,
due to gravity supplied hot water.
Ideally the heater should be tted close to the point where
hot water is required. In order to present the minimum
resistance to ow we recommend that the outlet pipe
work be 22mm for as much of its length as possible.
Sufcient space around the water heater must be
provided for both installation and servicing, refer to
gure 6, page 12 for the clearance dimensions.
6.1.2 Water Connections
The unit is supplied with the following connections:
`Cold water inlet – 15mm push t connector
`Hot water outlet – 22mm open end pipe
`Breather pipe - 22mm open end pipe (Initial
Breather Pipe with tundish supplied in kit)
A full bore isolating valve must be inserted into the
15mm cold water inlet pipe work as close as is practical
to the water heater, this is to aid both the installation
and servicing of the unit during its service life.
Figure 7: Example of typical installation (not to scale)
Overow to safe and
suitable location
Cold feed
Hot outlet
Pressure reducing valve CT2
Thermostatic blending valve CT1
Service valve (needs to be full bore)
The unit must be a minimum of 1.2m
above highest outlet
WARNING
If the unit is being installed for a hand wash
only requirement then it is must be tted with
an appropriate low pressure blending valve
on the hot pipe work, close to the point of use
outlet. These available through the supply
partners found on the back page. This will allow
the water in the heater to be stored at a higher
temperature, water stored above 60°C not only
gives more useable blended hot water output,
it also considerably reduces the possibility of
harbouring bacteria

14
6.2 Wall xing
The units' wall mounting is provided by two brackets,
one supplied already tted to the water heater, the
second ‘wall bracket’ is provided within the kit.
The wall bracket has several mounting points. If the
water heater being installed is a direct replacement for
either an existing Heatrae Sadia FBM or Santon R Unit
of the same capacity, then the wall mounting points
used by these existing water heaters will align with the
corresponding mounting points on the new wall bracket
for the unit, see gure 8 and 9 below.
In addition to these mounting points the wall bracket has
additional holes that may align with those previously
used by the water heater being replaced, see tables 6
and 7 below.
 When tting the wall bracket ensure that the
xings used are suitable for the wall structure and the
weight of the water heater when full of water, see technical
data table 1 on page 6 of this instruction manual.
CAUTION
The wall bracket is supplied within the
packaging at the top.
A
B
C
D
Previous product t Dimension
AFBM 25L 445
BOTHER 320
CR UNIT 25L 307
DOTHER 400
 There are two types of main brackets, one which
only ts the 25L unit and another which ts all the larger
sizes.
A
B
C
D
Previous product t Dimension
AFBM 50, FBM 75 AND OTHER* 445 (450)*
BR UNIT 45L, 70L and 115L 410
COTHER 530
DFBM 125L 565
Table 7: 45L, 70L and 120L bracket hole dimensions
Figure 8: 25L wall bracket
Table 6: 25L unit bracket hole dimensions
Figure 9: 45L, 70L and 120L wall bracket

15
6.2.1 Wall xing procedure top bracket
If the unit being tted is a direct replacement for an
existing Heatrae or Santon product of the same
capacity then as stated in section 6.2 the existing
wall xing points can be used, provided that they are
suitable for the weight of the water heater being tted
when full of water, see Table 1, page 6. If the water
heater is being tted for the rst time then follow the
procedure detailed below.
6.2.2 Wall xing procedure bottom bracket
`Supplied with the water heater as part of the kit is
a xing bracket with two screws and shake proof
Table 8: Fixing bracket dimension to bottom of unit
washers. The xing bracket is required to be tted
to the water heater. Lay the water heater down on a
at surface, face down, ensuring that the heater is
protected from any potential damage. Remove the
bracket, screws and washers from the packaging
and t the bracket to back of the water heater as
shown.
Figure 11: Fixing bracket assembly at bottom of unit
M8
x2
(Security)
`Carefully stand the water heater upright, taking
care not to damage the unit.
WARNING
Be aware that with the xing bracket
attached the water heater will not sit at
to the oor and therefore will be unstable.
Care must be taken not to allow the heater
to topple over.
`Refer to table 1, page 6 for the weight of the water
heater empty, using an appropriate lifting method
lift the water heater up and position the bottom
edge of the water heater bracket over the top edge
of the wall bracket, position the unit towards the
wall and then lower, see gure 12, page 16
CAUTION
Please note that the water heater bracket
has a location spigot that sits lower than
the visual edge. This needs to be taken
into consideration when positioning the unit
above the wall bracket.
A
Product Size 25L 45L 70L 120L
Dimension A 621 679 1015 806
Figure 10: Fixing bracket dimension to bottom of unit
`Mark the position of the bottom edge of the heater
ensuring that this position is a minimum of 1.2
meters above the highest draw off point see gure
7, page 13.
`Mark the position of the centre line for the wall
bracket mounting holes and mark the centre points
for the xings, see gure 10 for position.
`Drill appropriate holes for the xings
`Secure the wall bracket to the wall using suitable
xings, ensuring that it is secure.
WARNING
Before drilling ensure there are no services
in the immediate area within the wall
structure

16
Figure 12: Bracket lifting procedure
1
2
Figure 13: Top bracket locating procedure
`Once the water heater is located correctly on the
wall bracket, slide either left or right to locate the
spigot in the slot, see gure 13 above.
`Using an appropriate xing, secure the water
heater to the wall with the xing bracket at the
bottom of the heater.
WARNING
All pipe work must be installed by a
competent Installer and must comply with
the following.
3
6.3 Water connections
WARNING
A minimum dynamic pressure of 0.5 bar and
maximum pressure of 10 bar is required. If
the measured inlet pressure exceeds this
value then a pressure reducing valve must be
tted, this is available through Heatrae Sadia's
supply partners.
`The appropriate Water Supply (Water Fittings)
Regulations 1999, Water Byelaws 2000 Scotland
and the Water regulations Northern Ireland must
be adhered to.
`The above regulations require the following;
`A full bore servicing valve shall be installed on the
inlet pipe Schedule 2 - Section 16(2).
`A full bore servicing valve shall be installed on the
outlet pipe Schedule 2 - Section 16(3).
`All ttings used must be WRAS approved
6.3.1 Water (Inlet)
 Each installation can differ in requirement see
gure 7, page 13 for a typical installation.
`Before work commences ensure the water supply
is isolated at the main stopcock.
`Fit a full bore isolating valve is inserted into the
inlet feed pipe as close as is practical to the water
heater.
`Connect the inlet feed pipe to the 15mm inlet push
t connector on the underside of the water heater,
see gure 4, page 9.
WARNING
If this unit is cistern fed there needs to be a
minimum of 5m from the cistern to the top
of the unit, to ensure a dynamic pressure
of 0.5 bar.
CAUTION
Do not use a solder tting as this will
invalidate the unit warranty
WARNING
Do not use chrome or stainless steel pipe
work on push ttings on this unit.

17
WARNING
This appliance must be earthed.
WARNING
The water heater must be connected to
a 230/240Va.c. electrical supply using a
double pole isolating switch fused at 13A,
with a minimum 3mm contact separation
in both poles. The supply cable must be 3
core and each core must have a minimum
cross sectional area of 1.5mm2.
6.3.2 Hot Water Outlet
`An open ended 22mm pipe is provided at the
bottom of the water heater for connection of the hot
water outlet. Using a compression tting connect
this outlet pipe to the hot water feed to the service
points. Ensure that a full bore isolating valve is
installed in this outlet pipe work as close to the
water heater as practical.
6.3.3 Breather Pipe
The water heater is provided with a breather pipe
assembly which consists of a short section of 15mm
pipe with a Tundish tted at one end and a push t 90
degree reducer at the other end.
`Push this assembly onto the 22mm pipe at the top
of the water heater. This assembly is designed
to swivel either to the left or the right of the unit.
Decide which side is to be used for the location
of the pipe. This breather pipe must be laid in a
continuous fall and terminate to a safe and visible
location. If a breather pipe already exists move the
assembly to the correct side of the water heater.
`Once installed connect the breather pipe to the
22mm compression tting on the Tundish, ensure
connection is tight, secure all pipe work in the
appropriate manner.
6.4 Electrical Installation
WARNING
It is suitable for a.c. supply only.
WARNING
Electrical installation must be carried
out by a competent electrician and be in
accordance with the latest I.E.E wiring
regulations, ensure the electrical supply is
switched off before making any connections
to the unit.
`Using an appropriate tool, remove the bottom
access panel, retain the screws and panel, place
in a safe location.
`The supply cable must be routed through the cable
entry point at the bottom of the heater and must be
fed through the cable grip provided with the outer
sheath of the cable rmly secured by tightening the
screws on the cable grip in accordance with the
latest version of BS 7671
`The cores of the supply cable must be connected
to the terminal block provided, in the following
manner ensuring that each connection is tight:
Earth (coloured green/yellow or green) to Earth
Terminal E
Neutral (coloured blue or black) to termination marked
N.
Live (coloured brown or red) to termination marked L.
If twin and earth cable is used the bare Earth
conductor must be sleeved.
CAUTION
Do not use a solder tting
CAUTION
Back ow precautions may be require when
using a mixer tap

18
7. Commissioning
7.1 General
After the initial installation is complete instigate the
following commission process.
7.2 Checklist before commissioning
`Turn the water supply back on and then the installed
water inlet isolation valve.
`Perform a pipe work ush
`Check the inlet water connections for leaks and
rectify as necessary.
`Check all other pipe work is installed correctly, see
section 6.3, page 16.
`Turn the hot outlet isolation valve on.
`Open a hot tap at the point of use
`Check all wiring is correct and connections are
secure in the terminals.
`Check that all pipe work has been earth bonded.
`Ensure the power supply to the water heater is
switched on at source.
WARNING
The water heater cannot be lled with
water without power applied, therefore it
is essential that the following checklist is
completed.
7.3 Commissioning procedure
`Switch on the power to the water heater at the
fused spur
`After approximately 10 seconds the heater will
switch the solenoid valve on and allow water to
ow into the heater. If this does not happen refer to
section 10, page 25, Troubleshooting.
`Check all pipe work and the water heater for leaks
during the water ll process.
`Close the hot water tap once water starts owing.
`Once water has reached the correct level in the
tank, the solenoid will automatically switch off.
`The water heater will now turn on the immersion
heater automatically. See section 3, page 6
Technical Specication for the heat up time.
WARNING
If during the following commissioning
process an error is indicated on the display
then refer to the troubleshooting section for
analysis, section 10, page 25.
 During this initial commission cycle only, the water
heater will raise the temperature automatically to 60oC,
this will pasteurize the water heater.
`To set the desired set point temperature refer to
section 8, page 19.
WARNING
If this does not happen and the water
heater continues to ll and water is seen in
the Tundish, turn off the water supply and
the electrical power immediately, refer to
section 10, troubleshoot page 25.

19
8. Operation
8.1 General
 Please note that this product has been
designed to make the operation of the unit and its
subsequent generation of hot water as simple for the
end user as possible. The factory settings that the unit
is delivered with are suitable for most installations.
8.2 Overview
`Refer to section 4, page 9, for an overview of the
product and a list of the main components.
`The heaters function is managed by a micro
controller on the control PCB.
DANGER
Always disconnect the electrical supply
before opening the cover.
CAUTION
The temperature set point is the thermostat
temperature and therefore may be lower
than the temperature at the top of the
tank where hot water is drawn off. That
water temperature will be at the set point
temperature +2°C.
DANGER
Setting the stored water temperature above
40°C will increase the risk of scalding, for
hand washing, it is essential that a suitable
low pressure water tempering valve is tted
in the hot water supply circuit. The installer
must ensure that this is carried out during
installation. As an end user, if you are
unsure about your installation then consult
a competent engineer before making any
changes.
To adjust the temperature refer to manual gure 14 and
carry out the following.
`The temperature control pointer position denes
the units temperature set point.
`Turn the dial anti-clockwise to decrease the
temperature and clockwise for to increase.
`The maximum temperature of 78oC and the
minimum of 38oC are the two stop points of the
temperature control at each end of the indicated
scale.
 Eco mode is the optimum temperature set
point (approximately 60oC) and should be sufcient for
most uses.
8.3 Temperature adjustment
78
ECO
38
Figure 14: Temperature control
DANGER
Setting the stored water temperature below
55°C will trigger the auto pasteurization cycle
which will heat the water to 60°C after 23
hours. This cycle will repeat ever 23 hours
whilst it is set below 55°C.

20
9. Maintenance
9.1 General
9.1.1 Maintenance requirements
The unit will require an annual maintenance
requirement in order to ensure safe working and
optimum performance. This is of greater importance in
hard water areas or where the water supply contains
particulate matter. Note: If the water is particularly hard
or where there are high concentrations of particulates,
then more frequent maintenance may be required.
The maintenance checks described below should be
carried out annually or as required by a competent
person.
After any maintenance, please complete the relevant
Service Interval Record, page 37.
9.2 Routine inspection & maintenance
operations – Water Heater Draining
WARNING
Any metalwork and exposed pipes may be
hot.
WARNING
Before commencing any servicing or
maintenance including removal of the
access panel at the bottom of the unit
ensure that the electrical power supply
and the domestic hot and cold water
connections are all isolated.
DANGER
The water that is drained from the water
heater could be very hot, up to 100°C,
extreme care must be taken to prevent risk
of scalding.
9.3 Routine inspection & maintenance
operations – Filter Inspection
There are two lters that require inspection, one in
the breather pipe at the top of the water heater and a
second in the water inlet pipe work.
9.3.1 Breather Pipe Filter Inspection
`Carefully disconnect the Tundish from the breather
pipe by unscrewing the small nut on the 15mm pipe
side of the Tundish.
`Carefully split the connection between the 15mm
pipe and the Tundish, once apart this will reveal the
mesh lter in the end of the 15mm pipe.
`Using a torch, inspect the lter for any debris, if
debris is present remove it. If the debris cannot
be removed then the lter must be replaced, see
spares list page 29, spare 13.
9.3.1.1 Breather Pipe Filter Replacement
`To replace the mesh lter, the 15mm breather pipe
must be removed from the water heater, once
removed, using an appropriate tool, push the lter
from the end of the pipe. Fit the replacement lter
by pushing into the end of the pipe nearest the
Tundish. Ret the pipe and the Tundish.
9.3.2 Inlet Pipe Filter Inspection
`To inspect this lter, the inlet control assembly must
be removed from the water heater.
`Disconnect the two earth wires that are connected
to the copper pipe work
Figure 16: Breather pipe lter removal
Figure 15: Access cover removal
2
5
L
x5
4
5
L
&
7
0
L
x6
1
2
0
L
x8
M5
(Security)
`Remove the access panel from the bottom of the
heater.
`Ensure that the drain tap is closed, remove the cap
from the drain valve
`Using a ¾ BSP female hose adaptor tted to a
suitable length of hose, connect to the drain valve.
`Ensure that the other end of the hose is positioned
and secured in a sink, basin or suitable waste
water drain.
`Open the drain valve and empty the water out of
the heater.
`Once the water heater is empty, the servicing can
commence.
WARNING
Ensure unit is drained.