This is a CAT II2H3+
appliance
USER, INSTALLATION
AND SERVICING
INSTRUCTIONS
Wall hung
combination boilers
SUPPORTED BY
2
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Index
Note
The boiler serial number is marked on the data label attached to the inside of the outer
casing. Refer to the ‘Introduction’ section for a description of the basic functions of the boiler .
The ‘User’ section describes how to safely operate the boiler.
Mandatory warning for CEE countries
WARNING, these appliances were designed, approved and inspected to meet the
requirements of the English market. The identification plate located on the inside of the
appliance certifies the origin where the product was manufactured and the country for
which it is intended.
If you see any exception to this rule, please contact your nearest Stockist.
Thank you in advance for your assistance.
Index
Introduction .......................................... 3
User
instructions ..................................3
Introduction .......................................... 4
Controls and lighting............................. 4
Technical data ..............................7
Installation
instructions ................................ 11
Clearances ......................................... 11
Terminal position ................................ 12
Heating system design....................... 13
Domestic hot water system design..... 13
Boiler connections .............................. 14
Gas connection .................................. 14
Boiler installation ................................ 15
Horizontal flue installation .................. 16
Vertical flue installation....................... 17
Flue configuration ............................... 18
Electrical connection .......................... 19
Commissioning................................... 20
Safety devices .................................... 22
Gas valve setting................................ 23
Adjustments ....................................... 23
Boiler schematic................................. 25
Servicing
instructions ................................26
Routine cleaning and inspection......... 27
Replacement of parts ......................... 28
Schematic wiring diagram .................. 31
3
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User instructions
Introduction
The icon 23 t and icon 28 t boilers are wall mounted combination boilers providing central
heating and instantaneous domestic hot water.
The boilers are of the II2H3+ category for use with Natural gas (G20) as distributed in the United
Kingdom.
These instructions should be carefully followed for the safe and economical use of your boiler.
The boiler has a fan assisted balanced flue which both discharges the product of combustion to,
and draws the combustion air from the outside of the building.
ACCESSORIES
A range of accessories are available including vertical flue components. For further information,
contact you nearest Stockist.
GAS SAFETY (INSTALLATION AND USE) REGULATIONS
In your interests and that of gas safety, it is the law that ALL gas appliances are installed and
serviced by a competent person in accordance with the above regulations.
GAS LEAK OR F AULT
If a gas leak or fault exists or is suspected, turn the boiler off and consult the local gas company or
your Installer/Service Provider.
BOILER CONTROLS
The control panel, located at the lower front of the boiler , allows the boiler to be started, shut down,
controlled and monitored during use, refer to ‘User Instructions’.
User
instructions
4
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User instructions
Introduction
The icon 23 t and icon 28 t boilers are wall mounted combination boilers providing central
heating and instantaneous domestic hot water.
These instructions should be carefully followed for the safe and economical use of your boiler .
GAS LEAK OR F AULT
If a gas leak or fault exists or is suspected, turn the boiler off and consult the local gas company or
your Installer/Service provider.
IN CASE OF POWER SUPPLY F AILURE
The boiler no longer operates.
As soon as power supply is restored, the boiler will restart automatically.
IN CASE OF LOSS OF W ATER IN THE SYSTEM
CAUTION: The boiler is installed as part of a sealed system which must only be drained and
filled by a competent person.
If the pressure shown on the pressure gauge is less than 1 bar the system must be filled up
immediately.
Important notice: A central heating system cannot operate satisfactorily unless it is properly filled
with water and unless the air initially contained in the piping systems has been properly bled off. If
these conditions are not satisfied, air noise will occur within the system.
AIR IN THE HEATING SYSTEM
Persistent air in the heating system may indicate leaks in the system or corrosion taking place. Call
your Installer/Service provider.
OVERHEATING SAFETY
In the event of problem, the overheat safety device causes
safety shutdown of the boiler. If this happens, call your Installer/Service provider.
Controls and lighting
The control panel, located at the lower front of the boiler
casing, see diagram, allows the boiler to be started, shut
down, controlled and monitored during use.
Make sure that:
— The boiler is connected to the electrical supply.
— The boiler gas service cock is open.
— The pressure gauge reads between 1 and 2 bar .
The boiler is now ready to start.
5
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User instructions
Controls
1 Safety lockout light
2 Summer/Winter switch
3 Heating temperature control
4 Hot water temperature control
5 Pressure gauge
6 Timeclock
7 Plastic toggles
TO START THE BOILER
Turn selector (2) to the desired Summer
or Winter position.
The green lamp
will light.
TO STOP THE BOILER
Turn selector (2) to the OFF position (0).
If the boiler is to be out of operation for a long period, turn off the gas service cock.
SETTING TO ‘SUMMER’ MODE (HOT W ATER ONLY)
Turn selector (2) to the Summer position
.
Adjust the domestic hot water control
(4) to the desired hot water temperature. The boiler will
operate according to the system requirements.
SETTING TO ‘WINTER’ MODE (HEATING AND HOT WATER)
Turn selector (2) to the Winter position
.
Adjust the heating temperature control
(3) to the desired temperature.
Adjust the domestic hot water control
(4) to the desired hot water temperature. The heating
will operate according to the requirements of the timeclock and room thermostat if fitted or, will
operate according to the system requirements.
Domestic hot water always has priority over central heating.
TO PROGRAM DAIL Y TIMECLOCK (6) (WINTER MODE ONLY)
Set the current time, by turning the dial clockwise until the current time is shown against the
indicator “
”.
Push in plastic toggles (7) against the time you wish the heating to come on.
The timeclock can operate in three positions: automatic “
”, heating off “0”, and heating on “1”.
To select, move the lever to the desired position.
NOTE: In case of failure of electrical supply, timeclock does not operate, having no back-up bat-
tery . Therefore it will be necessary to adjust the current time, once electrical supply is restored.
6
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User instructions
SAFETY LOCKOUT
If, for any reason, the boiler does not operate, check if lockout lamp
(1) is lit. If so, turn
selector (2) to the reset position . The selector is spring loaded and automatically returns to
its’ previous position when released.
Note: This lamp will only light if the boiler has locked out and there is a hot water or central heating
demand at that particular time.
IMPORT ANT: If the safety lockout lamp lights frequently, contact your Installer/Service Provider.
DRAINING AND FILLING
CAUTION: The boiler is installed as part of a sealed system which must only be drained and
filled by a competent person.
Note: If there is persistent loss of system pressure, you must consult your Installer/Service Pro-
vider.
HEA TING SAFETY VALVE
CAUTION: A safety valve with a discharge pipe is fitted to this boiler.
The valve MUST NOT BE TOUCHED except by a competent person. If the valve discharges at any
time, switch the boiler off and isolate it from the electrical supply. Contact your Installer/Service
Provider.
SERVICING/MAINTENANCE
To ensure the continued efficient and safe operation of the boiler, it is recommended that it is
checked and serviced at regular intervals. The frequency of servicing will depend upon the installation conditions and usage but, in general, once a year should be enough.
CLEANING
The boiler casing can be cleaned with a damp cloth followed by a dry cloth to polish.
Do not use abrasive or solvent cleaners.
BOILER CASING
CAUTION: Do not remove or adjust the casing in any way , as incorrect fitting may result in
faulty operation.
If in doubt, contact your Installer/Service Provider.
7
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T echnical data
Technical
data
8
icon
T echnical data
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9
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T echnical data
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DIMENSIONS CONNECTIONS FOR FLUE
10
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T echnical data
HEATING
DOMESTIC
WATER
GAS
BOILER SCHEMATIC
1 By-pass
2 Pump
3 Drain valve
4 Expansion vessel
5 Gas valve
6 Burner
7 Primary heat exchanger
8 Flue hood
9 Air pressure switch
10 Automatic air vent
11 Fan
12 Loss of water switch
13 Heating system safety valve 3 bar
14 Hydraulic 3-way valve
15 Domestic heat exchanger
16 Water valve
RETURN
FLOW
OUTLET
INLET
AVAILABLE PUMP CAPACITY
1–icon 23 t (Automatic By-Pass)
2–icon 28 t (Automatic By-Pass)
Water flow l/h
Pressure m. H
2
O
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