andrews RSC 150 Manual

INSTALLATION AND SERVICE MANUAL Part number E104
Andrews. Built to perform.
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.
RSC range
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Models 150 and 190
Permanent Pilot and Auto Ignition

2 E104 Issue 2 14/07/16
Andrews Water Heaters
Reproduction of any information in this publication by any
method is not permitted unless prior written approval has been
obtained from Andrews Water Heaters.
Andrews Storage Water Heaters have been designed and
manufactured to comply with current international standards of
safety. In the interests of the health and safety of personnel and
the continued safe, reliable operation of the equipment, safe
working practices must be employed at all times. The attention
of UK users is drawn to their responsibilities under the Health
and Safety Regulations 1993.
All installation and service on Andrews Water Heaters must be
carried out by properly qualified personnel and, therefore, no
liability can be accepted for any damage or malfunction caused
as a result of intervention by unauthorised personnel.
Andrews Water Heaters’ policy is one of continuous product
improvement and, therefore, the information in this manual,
whilst completely up to date at the time of publication, may be
subject to revision without prior notice.
Further information and assistance can be obtained from:
Customer support
onday - Friday
8am - 5pm
Sales: 0345 070 1055
Technical: 0345 070 1057
Email: [email protected]
Website: www.andrewswaterheaters.co.uk
Twitter: @andrewsWH
Copyright Andrews Water Heaters 2015
Note
The Andrews Water Heaters covered in this manual
are for use with natural gas only

E104 Issue 2 14/07/16 3
Contents
Contents
1 General and safety information
1.1 General information
1.2 British standards
1.2.1 RSC range
1.3 Health and safety regulations 1993
1.4 Legionella in water heaters
2 Technical data
2.1 Appliance dimensions
2.2 RSC 150 & 190 connections
2.3 ErP data
3 Installation
3.1 Introduction
3.2 Location
3.3 Flue systems
3.4 RSC 150 & 190 flue fitting instructions
3.5 Air supply and ventilation
3.6 Water quality & treatment
3.7 Water connections - general
3.7.1 Hydrojet system
3.7.2 Water connections - vented systems
3.7.3 Water connections - unvented systems
3.7.4 Unvented system kit
3.7.5 Unvented system kit - parts list
3.8 Gas connections
3.9 Electrical supply - auto ignition units
3.10 Wiring diagram
4 Commissioning
4.1 Gas connections
4.1.1 To light the burner
4.1.2 To shut off the burner
4.1.3 To check main burner pressure
4.1.4 To light the burner auto ignition
4.1.5 To shut off the burner auto ignition
4.1.6 To check main burner pressure auto ignition
5 Operation
5.1 Auto ignition units
6 Servicing
6.1 Introduction
6.2 Burner assembly
6.2.1 The burner assembly should be cleaned and checked annually
6.3 Gas control valve
6.4 Flueway
6.5 Magnesium anode
6.6 Cleaning the storage vessel
6.7 Descaling information
7 Fault finding
7.1 RSC 150 & 190 Models
7.2 Removal of cold inlet dip tube & hot outlet nipple / anode
7.3 Auto ignition units
8 Parts list RSC 150 & 190
8.1 General assembly
8.2 Flue terminal assembly
8.3 24 volt auto system kit standard range
8.4 General assembly parts list
8.5 Flue terminal assembly parts list
8.6 24 volt auto system kit standard range parts list
9 Appendix
9.1 Dismantling, disposal and recycling
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4 E104 Issue 2 14/07/16
1 General and Safety Information
1 General and safety information
1.1 General information
The Andrews Water Heater has been designed for use with
NATURAL GAS only and is manufactured to give an efficient,
reliable and long service life.
To ensure the continued, trouble-free operation of your heater at
maximum efficiency, it is essential that correct installation,
commissioning, operation and service procedures are carried
out strictly in accordance with the instructions given in this
manual. By law, installation and commissioning of the heater
must be carried out by properly qualified personnel.
The heater(s) must be installed in accordance with the following
requirements;
The current GAS SAFETY (INSTALLATION AND USE)
REGULATIONS
The current BUILDING REGULATIONS
The Water Supply (WATER FITTINGS) REGULATIONS 1999
Additionally, installation should be performed in accordance with
all relevant requirements of the Gas Supplier, Local Authority
and recommendations of the British Standards and Codes of
Practice detailed below.
1.2 British standards and codes of practice
1.2.1 RSC range
BS 6700: Specification for design, installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages. This standard supersedes the
following British Standards and Codes of
Practice: CP99, CP310, CP324, 202, CP342
Part 2, Centralised Hot Water Supply.
BS 5440: Installation of flues and ventilation for gas
appliances of rated output not exceeding
60kW.
BS 6644 Installation of gas fired hot water boilers of
rated inputs between 60kW and 2MW.
BS 5546: Installation of gas hot water supplies for
domestic purposes.
BS 6891 Installation of low pressure gas pipework of up
to 28mm in domestic premises.
BS 7206: Specification for unvented hot water storage
units and packages.

E104 Issue 2 14/07/16 5
General and Safety Information 1
BS EN 806 (Parts 1 - 5) Specifications for installations
inside buildings conveying water for human
consumption.
BS 6644 Installation of gas fired water boilers of rated
inputs between 70kW and 1.8MW.
BS EN 12897 Water supply. Specification for indirectly heated
unvented (closed) storage water heaters.
IGE/UP/1A,1B Strength/tightness testing and direct purging.
IGE/UP/2 Installation pipework.
IGE/UP/10 - 1 (Edition 4): Installation of gas appliances in
industrial and commercial premises.
Note
Consideration should be given to amendments or
updates to the above standards.

6 E104 Issue 2 14/07/16
1 General and Safety Information
1.3 Health and safety regulations 1993
It is the duty of manufacturers and suppliers of products for use
at work to ensure, so far as is practicable, that such products
are safe and without risk to health when properly used and to
make available to users, adequate information about their safe
and proper operation.
Andrews Water Heaters should only be used in the manner and
purpose for which they were intended and in accordance with
the instructions in this manual. Although the heaters have been
manufactured with paramount consideration to safety, certain
basic precautions specified in this manual must be taken by the
user.
It is imperative that all users of the heater must be provided with
all the information and instruction necessary to ensure correct
and safe operation.
1.4 Effectiveness in combating legionella
Water systems in buildings have been associated with outbreaks
of Legionnaires' Disease, particularly in health care facilities
where occupants are significantly more susceptible to infection.
In recognition of the risks in hospitals, a Code of Practice for the
Control of Legionella in Health Care premises has been issued
by the Department of Health (1991). Codes of Practice
applicable to other premises have been published by other
organisations, principally the Health and Safety Executive
(HS)(G70) and the Chartered Institute of Building Services
Engineers (CIBSE, TM13).
All Codes of Practice draw attention to the design and operation
of water systems with reference to avoidance of factors that
favour colonisation by Legionella bacteria. These factors include
stagnation, lukewarm conditions (20°C to 45°C) and the
accumulation of debris, scale and corrosion in the base of tanks
and calorifiers.
Andrews Water Heaters has commissioned an independent
evaluation of their products to investigate their resistance to
build-up of Legionella bacteria.
Experiments were conducted to determine whether, following a
substantial challenge by legionella pneumophilia, after overnight
and stagnation conditions, the system was rendered free from
viable recoverable legionella. It was found that at 61°C, following
a challenge of approximately 107 organisms per litre, within one
hour, more than 99.999% of organisms had been killed. After a
subsequent stagnation period, sampling did not reveal any
residual contamination. The design of the base of the water
heater precludes legionella colonisation, even after build-up of
debris. The burner positioning ensures that the water at the
bottom of the heater reaches the same, or higher temperature
as in the rest of the heater.
Based on data obtained through experiment, the Andrews Water
Heater can be described as legionella resistant as it is
considered unlikely that, at the temperature tested, the organism
would colonise the water heater and present a possible health
risk.

E104 Issue 2 14/07/16 7
Technical Data 2
2 Technical data
2.1 Appliance dimensions
odel RSC 150 RSC 190
A Height of Heater mm 1264 1492
B Diameter mm 508 508
C Gas Connection mm 378 378
D Height to Centre of Flue mm 2118 2398
E Service Clearance mm 1226 1226
F Standard Flue Run mm 750 750
G Height to Flue Run mm 854 854
H Standard 90° Elbow mm 194 194
I Service Clearance mm 305 305
Service Clearance (front) mm 610 610
KWe recommend that the flue outlet can be installed in any configuration through 180° as long as proper service clearances are observed.
L Water Connection GRS mm 200 200
M Flue Terminal mm 170 170
AB
C
D
E
F
G
H
J
K
L
I
L
170mm
200mm
GRS
cold
Hot
Return via drain port
Minimum service clearance
Concentric Flue
External flue diameter 125mm
Internal flue diameter 80mm
Recommended service clearance
Recommended service clearance
Recommended service clearance
Fig. 1

8 E104 Issue 2 14/07/16
2 Technical Data
2.2 RSC 150 & 190 connections
odel RSC 150 RSC 190
Storage Capacity Litres 150 190
Recovery Through 44°C I/hr 159 181
Recovery Through 56°C I/hr 127 145
Heat Input kW 9.5 10.5
Heat Output kW 8.2 9.4
Gas Flow Rate m3/hr 0.88 0.98
Gas Family I2H Natural Natural
Flue Gas Temp Approx °C 180 180
Flue Gas Volume m3/H 16 16
Inlet & Flow Connections Rp 3/43/4
Return Connections Rp 3/43/4
Gas Connection Rp 1/21/2
Max. Working Water Pressure (vented) bar 10.3 10.3
Max. Working Water Pressure (unvented) bar 5.5 5.5
Water Test Pressure bar 20.7 20.7
Burner Pressure mBar 10.0 10.0
Injector Diameter mm 2.87 3.05
Flue Connection mm Min - Max 80 - 125 80 - 125
Weight Empty kg 66 74
Weight Full kg 216 264
Shipping Weight kg 73 82
Shipping Dimensions Carton mm 1499 x 635 x 711 1727 x 635 x 711

E104 Issue 2 14/07/16 9
Technical Data 2
2.3 ErP data
RSC 150 190
Declared load profile XL XXL
Water heating energy efficiency class
Water heating energy efficiency % 56 55
Annual energy consumption kwh(1) 00
Annual energy consumption Gj(2) 27 27
Other load profiles for which the water heater is suitable to use and the corresponding --
water heating energy efficiency and annual electricity consumption(3)
Thermostat temperature setting °C 60 60
Sound power level LWA indoors dB 34 38
Ability to off-peak hours functioning(3) --
Enables smart control settings(4) --
(1) Electricity
(2) Fuel
(3) If applicable.
(4) If smart control settings value is "1", the water heating energy efficiency and annual electricity and fuel consumption only relate to enabled smart control
settings.
B
B
RSC Natural Gas 150 190
Daily electricity consumption Qelec kWh 0.001 0.001
Declared load profile XL XL
Sound power level, indoors LWAdB 34 38
Daily fuel consumption Qfuel kWh 20.486 20.850
Emissions of nitrogen oxides NOxmg/kWh 117 117
Weekly fuel consumption with smart controls Qfuel, week, smart kWh --
Weekly electricity consumption with smart controls Qelec, week, smart kWh --
Weekly fuel consumption without smart controls Qfuel, week kWh --
Weekly electricity consumption without smart controls Qelec, week kWh --
Storage volume VI151 189
Mixed water at 40 °C V40 I 218 242
Harmonised standards applied EN: 13203-2
Specific precautions that shall be taken when the water Before any assembly, installation or
heater is assembled, installed or maintained: maintenance the installation and operation
manual has to be read attentively and to be
followed

10 E104 Issue 2 14/07/16
3 Installation
3 Installation
3.1 Introduction
The law requires that installation is carried out by a
properly qualified person
Install in accordance with current British Standard Code of
Practice 342 part 2 and British Standards 5440, 5546, 6644,
6700, 6798 and 6891.
3.2 Location
The location chosen for the heater must permit the provision of a
satisfactory flue and an adequate air supply.
The heater must not be installed in a room which contains a
bath or a shower and must not be installed in a bedroom or
bedsitting room.
A clearance of 300mm should be left around the heater for fitting
and servicing purposes and 762mm above the heater for
removal of the flue baffle. The above clearances are
recommended for ease of servicing. They can be reduced if
necessary but a clearance of 300mm must be left in front of
heater for access to the burner and controls. The flue baffle
clearance should also be maintained if possible to avoid
servicing problems.
The floor on which the heater is installed must be flat, level and
of sufficient strength to withstand the weight of the heater when
filled with water, and should satisfy the requirements of the Local
Authority & Building Regulations.
Any combustible material adjacent to the heater must be so
placed or shielded as to ensure that its temperature does not
exceed 65°C.

E104 Issue 2 14/07/16 11
Installation 3
3.3 Flue system
See
Detailed recommendations for flueing are given in British
Gas booklet IM/11 and BS 5440 part 1. The following
notes are intended to give general guidance:
Note
• A horizontal or vertical flue kit is supplied with each
heater. Flue fitting instructions on page 11.
• Location. The siting of the flue terminal is not critical
with respect to the performance of the unit. However,
areas where the discharge of combustion products
would cause a nuisance should be avoided. In
accessible positions a suitable guard should be
provided. (see page 11).
• Route. The route of the flue is not critical, with three
installation options available. See below for
permissible flue lengths. Where installation options 2
or 3 are used we recommend that the flue outlet can
be installed in any configuration through 180° as long
as proper service clearances are observed see fig.1
page 7.
A
A
B
B
600mm
500mm
500mm
3.2 m
1.2 m
Wall
Roof
Installation 1 Installation 2 Installation 3
Fig. 2
Flueing Option Installation 1 Installation 2 Installation 3
Type of Flueing C31 C31 C11
Flue Restrictor Ø 45mm Ø 50mm Ø 60mm
A ≤ 2.0 - ≥ 0.5m and ≤ 1.0m
B-≤ 1.0m ≤1.0m
odel RSC 150
odel RSC 190
Flueing Option Installation 1 Installation 2 Installation 3
Type of Flueing C31 C31 C11
Flue Restrictor Ø 48mm Ø 55mm No restrictor required
A ≤ 2.0 - ≥ 0.5m and ≤ 1.0m
B-≤ 1.0m ≤1.0m

12 E104 Issue 2 14/07/16
3 Installation
3.4 RSC 150 & 190 flue fitting instructions
1. Fit heater adaptor D1 to heater ensuring correct location on
primary flue spigot from heater. (Use 4 self tapping screws
provided).
2. Fit flue restrictor ring D7 into heater adaptor D1 The correct
size of restrictor for each heater model and installation is
shown on page 10.
3. Fit flue section D2 into heater adaptor D1.
4. Fit elbow D4 into flue section D2 for horizontal flue runs.
5. Determine correct position of flue outlet and fit outer wall
plate and inner wall plate. Fit flue outlet guard if required.
(Fixings not supplied).
6. Fit horizontal terminal D3 or make up lengths of flue required
(see page 10) into elbow D4. Each joint must be secured
with a sealed clamp D6.
7. For vertical installations fit flue lengths required (see page
10) into heater adaptor D1.
8. Determine correct position of flue terminal and fit either D8 or
D9 roof plates.
9. Fit D5 vertical terminal through roof plate into vertical flue
pipe.
10. Fit D6 sealed clamps on all joints.
11. On all installations the lengths of flue pipes may be cut to
obtain correct length of flue route required.
12. See parts list on page 27 for part numbers and description of
flue available.
3.5 Air supply and ventilation
D8
D9
D4
D5
D1 D7
D2
D6
D6 D3 D10
Fig. 3
Air Vent Areas
Position of Air Vents Air from room or internal space Air direct from outside
High Level 10cm2per kW 5cm2per kW
Low Level 10cm2per kW 5cm2per kW
In a Room or Internal Space No requirement for ventilation
Note
The following notes are intended to give general
guidance: Where the heater is to be installed in a room
NO VENTS ARE REQUIRED.
Where the heater is to be installed in a compartment,
permanent air vents are required in the compartment at
high and low level. These air vents must either
communicate with a room or internal space or be direct to
outside air.
The minimum effective areas of the permanent air vents
required in the compartment are as follows:

E104 Issue 2 14/07/16 13
Installation 3
Air vents should have negligible resistance and must not be
sited in any position where they are likely to be easily blocked or
flooded or in any position adjacent to an extraction system which
is carrying flammable vapour.
Consideration must be given to the position of the high level
ventilation opening. A high level vent must not be sited within
300mm measured vertically, of the flue terminal
Grilles or louvers should be so designed that high velocity air
streams do not occur within the space housing the heater(s).
Note
Both air vents must communicate with the same room or
internal space or must both be on the same wall to
outside air.
Note
IMPORTANT:
The vapours given off by halogen based compounds can,
if drawn into the combustion air, cause corrosion of the
Storage Vessel and premature failure of the
thermocouple.
If water heaters are to be installed, in locations where
halogens are likely to be present they should be isolated
from such compounds and ventilated from and to outside,
uncontaminated atmosphere.
Some of the vulnerable areas are listed below -
i) Hairdressing salons and adjoining rooms and
basements.
ii) Establishments where dry cleaning solutions are
used or stored.
iii) De-greasing plants using hydrocarbon solvents.
iv) Premises where refrigerant gases are used or
stored.

14 E104 Issue 2 14/07/16
3 Installation
3.6 Water quality and treatment
To ensure long life and efficient, reliable performance from
Andrews water heaters it is essential that the water heater is
installed and serviced in accordance with the manufacturers
instructions.
Each water heater is fitted with one or more magnesium
anode(s) which protect the tank from corrosion caused by
electrolytic action within water systems. The magnesium anodes
are sacrificial and as such they erode as they offer protection.
Once the anode has eroded to less than 50% of its original
diameter it may not offer sufficient protection. The anodes
should be inspected on an annual basis and replaced as
necessary. The frequency of which the anode needs replacing
can vary and water quality can have a major influence on this.
Andrews offer CorrexTMUP powered anodes as an alternative to
the traditional magnesium anodes. CorrexTMUP anodes are
made from titanium and are non sacrificial, therefore they do not
have a requirement for maintenance or replacement. However,
the potentiostat, which regulates the protective current supplied
to the CorrexTMUP anode, has an indicator light which shows
green when the anode is functioning correctly and red if a
malfunction occurs.
CorrexTMUP anodes are available as an optional extra on all
models of Andrews storage water heaters and tanks.
In hard water areas scale formation can occur in hot water
systems and water heaters and the higher the temperature of
operation and the higher the volume of water used the more
problematic this scale build up can be. Water treatment is
normally recommended when the hardness reaches 100-150
ppm (7-10 degrees Clark) and above - a number of water
treatment devices are available.
Contact Andrews Water Heaters for further information.
Note
When specifying or installing Andrews water heaters in
hard water areas we would recommend that a specialist
in this area of operation is consulted.

E104 Issue 2 14/07/16 15
Installation 3
3.7 Water connections - general
3.7.1 Hydrojet system
The heater is fitted with the Hydrojet Total Performance System
incorporated in the cold inlet dip tube. The tube is designed to
increase turbulence and reduce sediment build up, reduce
thermal stacking and increase delivery.
3.7.2 Water connections - vented systems
The water heater must be supplied from a cold water feed
cistern and the hot water supply pipe must be fitted with an open
vent pipe in accordance with BS 5546. Local regulations and
bye-laws must be observed when installing the system but
typical water service layouts are shown in Fig. 5.
The cold water feed cistern must have an actual capacity
greater than the hourly recovery rate of the heater or heaters to
which it is fitted, the minimum actual capacity allowed for a feed
cistern is 227 litres (50 gal).
The actual cistern capacity is the capacity to the normal water
line of the cistern. All cisterns used should be to the relevant
British Standard and the distance from the normal water line to
the top of the cistern should be as laid down by the water
authorities.
The cold water inlet and hot water outlet are identified on top of
the heater. Connect the cold water feed and hot water outlet to
these nipples with union adaptors for ease of servicing.
After installation of the water system open the main water supply
valve, flush the system and fill the heater. Open the hot taps to
allow air to escape from the system. When the system is free of
air, close the taps and check for leaks at the control thermostat,
drain cock and pipe connections at the top of the heater.
Fig. 4
Fig. 5
The upper “jet ports”
direct the flow outward
to begin the dynamic
mixing action.
The lower “jet ports”
direct the flow inward
to increase the
turbulence.
Caution
Do not apply heat to these nipples if making capillary
soldered joints as they are fitted with plastic inserts. Make
the capillary joints to the pipes before connecting to the
heater. A drain cock is supplied with the heater and this
should be fitted to the appropriate boss as shown on the
drawing.
Open vent
Secondary return
Gas control thermostat
Check valve
Overflow
Stop valve
Flue
Cold water cistern
Union
adaptor
Hot water
service pipe
Cold water
inlet valve
Cold water
feed

16 E104 Issue 2 14/07/16
3 Installation
3.7.3 Water connections - unvented systems
When used in an unvented system, the Andrews storage water
heater will supply hot water at a pressure of 3.5 bar (50.8 psi)
providing this pressure is available at the mains feed. During
conditions of no flow, whilst the burner is operating, the pressure
of the system will rise to a maximum of 6 bar (87.0 psi).
When testing the system it is recommended that a maximum
test pressure of 8.62 bar (125 psi) be employed.
The Andrews range of storage water heaters can be used on
unvented hot storage water systems with the addition, to the
standard heater, of an "Unvented Systems Kit" Part No. B213
obtainable from Andrews Water Heaters.
All fittings and materials must be suitable for use with drinking
water and listed in the current Water Research Centre "Materials
and Fittings Directory".
Installation of unvented hot storage water systems must comply
with the requirement G3 of the Building Regulations.
When assembling items F1 and F2 care must be taken to
ensure that the flow arrows marked on the components are
pointing in the direction of flow i.e. towards the water heater.
The cold water for services may be drawn from the 22mm
compression port on item F1(a). The water pressure at this point
will be similar to that available at the hot water outlet of the
water heater. If port (a) is not used it should be sealed with the
blanking plug supplied.
If higher flow rates are required for the cold water services a
suitable "tee" fitting should be included in the pipework upstream
of item F1.
The discharge pipe from the tundish should be of suitable metal
and be at least one pipe size larger than the outlet pipe on the
safety devices. (See Building Regulations Approved Document
G3).
See
Fig.8 lists and illustrates the component parts of the
Unvented Systems Kit.
Fig.6 illustrates the general arrangement of the
components.
The Wall Mounting Kit is available as an optional extra.
Item F4 must be fitted into the Temperature Relief port
(see Fig. 7)
Fig. 6
Balanced cold
water take-off
(if required)
F3
Expansion
vessel
F4
Temperature
pressure relief
valve
Cold water
inlet of
water
heater
F5 Reducing bush
(a)
F6 tundish
F2 Check valve/
expansion valve
Cold water feed
F7 Hose
assembly
F1 Pressure
reducing
valve
strainer
Fig. 7
F3
F1
F2
F4
F6
F5
Cold water
take off
Cold water inlet
To drain
Hot water service pipe
Check valve
Secondary
return

E104 Issue 2 14/07/16 17
Installation 3
3.7.4 Unvented systems kit
3.7.5 Unvented systems kit - parts list
Ref. Part No. Description Qty
B213 Unvented Systems Kit Complete 1
Comprises
F1 C780 Pressure Reducing Valve 1
F2 C781 Check Valve / Expansion Valve 1
F3 E319 Expansion Vessel 1
F4 E320 Temperature / Pressure Relief Valve 1
F5 E321 3/4” x 1/2” Reducing Bush 1
F6 E322 Tundish 1
F7 C788 Hose Assembly 1
Fig. 8
F3
F4
F5
F2
F6
F1
F7

18 E104 Issue 2 14/07/16
3 Installation
3.8 Gas connections
THE APPLIANCE UST ONLY BE USED WITH NATURAL
GAS.
The installation of the gas supply should conform to the
requirements of IM/16 published by British Gas p.l.c. or BS
6891. ointing compound used must conform to BS 5292 pt 5.
Fit a 1/2, gas supply cock immediately upstream of the gas
control thermostat and connect to the gas supply. Pressure test
the gas installation for soundness. If any doubt exists as to size
of gas supply pipe, consult your local Gas Region.
It is recommended that a pressure test point is fitted on the input
next to the gas supply valve.
3.9 Electrical supply - auto ignition units
External wiring to the water heater(s) must be installed in
accordance with current I.E.E. Regulations for the wiring of
buildings and to any Local Regulations that may apply.
The Auto Ignition Heater is designed to operate from a
220/240V, Single Phase supply. The fuse rating is 5 amps.
The method of connection to the mains electricity supply should
facilitate complete electrical isolation of the appliance, preferably
by use of an unswitched shuttered socket outlet in conjunction
with a fused three pin plug, both complying with the
requirements of BS 1363.
Alternatively, a fused double pole switch or fused spur box
serving only the heater may be used.
The point of connection to the mains electricity supply should be
readily accessible and adjacent to the appliance.
Connect the electrical supply to the main control panel terminal
block via the cable glands in the base of the control panel.
Mains input cable should be 0.75mm2, 3 core, and should be
connected to the mains supply as detailed above.
It is recommended that screen cable is used where the volt-free
contacts are to be connected from an external supply. This will
eliminate the risk of possible interference from nearby high
voltage cables.
Caution
Do not apply heat in close proximity to the gas control as
this will result in damage occurring to the control.

E104 Issue 2 14/07/16 19
Installation 3
3.10 Wiring diagram
Fig. 9

20 E104 Issue 2 14/07/16
4 Commissioning
4 Commissioning
4.1 Gas connections
4.1.1 To light the burner
Open the main gas supply cock after all connections to the gas
control thermostat are complete, and test all connections with
soap solution.
1. Remove outer cover wait 3 minutes for any unburnt gas to
vent.
2. Turn the gas control knob to pilot. (see below)
3. Fully depress the gas control knob and the piezo ingnitor.
With the pilot burner alight, hold the gas control knob for 20
seconds. When the gas control knob is released the pilot
should remain lit, if not repeat the operation. The pilot can be
seen through the sight glass on the inner cover.
4. Replace outer cover.
5. Set the temperature indication dial to the required
temperature. (see below)
6. Turn the gas control knob to ON, the burner should now
light, if not repeat the operation. (see below)
4.1.2 To shut off the burner
For long periods only, eg. holidays or periods of 7 days or more,
turn the gas control knob to ‘PILOT’ position, depress slightly
and turn clockwise to ‘OFF’. Turn off the gas service cock.
For shorter periods, eg. less than 7 days, leave the heater under
the control of the thermostat.
Caution
Do not operate the water heater until the storage vessel is
completely filled with water, with water running from all
hot taps.
Note
If the pilot should become extinguished for any reason,
turn off the appliance, and wait three minutes before
attempting to relight.
Thermostat Setting
Approx. Water
Temperature
0124
40°C 52°C 62°C 71°C
Fig. 10
Correct size and shape
of the pilot flame
Note European Symbols:
OFF
PILOT
ON
30 mm