Biasi Activ A 250V User manual

Wall hung, fanflue, roomsealed, high efficiency gas boiler
User manual and
Installation instructions
ActivA
Models G.C. Appl. No.
Activ A 12OV 41-583-14
Activ A 15OV 41-583-15
Activ A 20OV 41-583-16
Activ A 25OV 41-583-17

- 2 -
WARNING
Congratulations on your choice.
ActivA are condensing high efficiency sealed chamber fan flue gas boilers. They are fully
electronically controlled and have electronic ignition.
The materials they are made of and the control systems they are equipped with give you
safety, a high level of comfort and energy savings to allow you to get the greatest benefit out
of independent heating.
ActivA allow a higher efficiency by reducing the flue gas temperature such that the water
vapour formed during the combustion is condensed out.
This allows a gain of useful heat that otherwise would be lost.
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of mechanical or generic origin (e.g.: injuries or bruises).
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of electric origin (electrocution).
DANGER: The indications marked with this symbol must be observed to pre-
vent the risk of fire or explosion.
DANGER: The indications marked with this symbol must be observed to pre-
vent accidents of heat origin (burns).
ATTENTION: The indications marked with this symbol must be observed to
prevent malfunctioning and/or damage to materials of the appliance or other
objects.
ATTENTION: The indications marked with this symbol is important informa-
tion that must be carefully read.

- 3 -
WARNING
Remember that...
The manual must be read thoroughly, so that you will be able to use the boiler in a safe
and sensible way; must be carefully kept. It may be necessary for reference in the fu-
ture.
The lighting up must be carried out by competent and responsible engineer.
The manufacturer
• disclaim all liability for any translations of the present manual from which incorrect inter-
pretation may occur
• cannot be held responsible for non-observance of instructions contained in this manual
or for the consequences of any procedure not specifically described
Guarantee conditions
• The guarantee registration form must be returned within 30 of purchase, failure to com-
ply will invalidate the guarantee.
Using the boiler...
Before lighting the boiler you are advised to have a Gas Safety Registered Engineer
check that the installation of the gas supply
• is gas-tight;
• is of the correct gauge for the flow to the boiler;
• is fitted with all the safety and control devices required by the current Regulations.
Ensure that
• check with the Installer that he has connected and terminated the pressure relief valve
in a manner which allows safe discharge. The manufacturers are not responsible for
damage caused by opening of the pressure relief valve and consequent escape of wa-
ter, if this is not connected and terminated.
• the installer has connected the condensate outlet to a suitable drain pipe.
On detecting the smell of gas:
• don’t operate any electrical switches, the telephone or any device that may produce
sparks.
• open the windows and doors at once to create a draught of air which will purge the
area;.
• shut off the gas cocks.
• get the assistance of a qualified person. Emergency telephone number
Tel [phone].

- 4 -
WARNING
Do not touch the appliance with parts of the body that are wet or damp and/or bare
feet.
Do not block or modify the condensate outlet and pipework.
In case of structural work or maintenance near the exhaust duct and/or fume exhaust
devices or their attachments, turn off the appliance. On completion of the work, have a
professionally qualified person check their efficiency.
Repairs (under guarantee) must be carried out only by a Biasi approved engineer, us-
ing genuine spare parts. Thus do no more than switching off the boiler yourself (see the
instructions).
Your boiler allows heating up of water to a temperature less than boiling point;
• must be connected to a central heating system and/or a hot water supply system, com-
patible with its performance and output;
• can be used only for those purposes for which it has been specially designed;
• must not be touched by children or by those unfamiliar with its operation;
• must not be exposed to weather conditions.
During the operation it is quite normal that the boiler produces a white plume of conden-
sation vapour from the flue terminal. This is due to the high efficiency of the appliance and
may be particularly evident with low outdoor temperatures.
Safe handling of substances
Biasi products are manufactured in accordance with ISO 9001 and do not, and will not,
contain any hazardous materials or substances such as asbestos, mercury or C.F.C.’s. The
appliance packaging does not contain any substances, which may be considered a hazard
to health.
When handling or lifting always use safe techniques
• keep your back straight, bend your knees, don't twist.
• move your feet, avoid bending forwards and sideways and sand keep the load as close to
your body as possible.
Where possible transport the boiler using a sack truck or other suitable trolly.
Always grip the boiler firmly, and before lifting feel where the weight is concentrated to estab-
lish the centre of gravity, repositioning yourself as necessary.

- 5 -
WARNING
Combustion chamber panels
Material: mineral fibres
Known hazards - Some people can suffer reddening and itching of the skin. Fibre entry into
the eye will cause foreign body irritation, which can cause severe irritation to people wearing
contact lenses. Irritation to respiratory tract.
Precautions - Dust goggles will protect eyes. People with a history of skin complaints may
be particularly susceptible to irritation. High dust levels are only likely to arise following harsh
abrasion. In general, normal handling and use will not present high risk, follow good hygiene
practices, wash hands before, touching eyes, consuming food, drinking or using the toilet.
First aid - Medical attention must be sought following eye contact or prolonged reddening of
the skin.
Thermostat / Temperature gauge
Description - Sealed phial and capillary containing liquid.
Known hazards - irritating to skin, eyes and throat. Vapour is harmful. Inflammable -do not
extinguish with water.
Precautions - Do not incinerate. Avoid contact with broken/leaking phials. Do not purposely
puncture.
First aid - medical attention must be sought following eyes/skin contact, wash with clean
water.
Sharp Edges
Caution should be taken when handling the boiler to avoid sharp edges on the boiler.
Boiler installation and commissioning tips
The installation must be carried out by a qualified Gas Safety Registered Engineer
who will be responsible for observing the current Regulations and the completion of the
Benchmark Gas Boiler System Commissioning Checklist, located at the back of this User
manual.
Installing the boiler...
Do not forget to remove the transit caps and plugs from the boiler connections these are
fitted to every boiler.
Keep the boiler clear of dust during installation and in particular do not allow any dust or
debris to enter the top of the boiler where the flue connection is made. It is recommended
that you put a dust sheet over the top of the boiler until you are ready to make the flue
connection.

- 6 -
WARNING
Because every boiler is fired and tested live at the factory, a small amount of water re-
mains within the boiler. It is possible for this water to initially cause the pump to seize. It is
therefore recommended that the pump rotor be manually turned to free its rotation before
turning the boiler on.
Remember to release the auto air purge before filling the boiler. See the instructions to
identify the location of this device.
This boiler allows to control the flow temperature of the central heating system at very
low levels. In case of underfloor heating system a temperature limiting device (e.g. a
safety thermostat) is recommended to stop the boiler in case that the water temperature
exceeds the design temperature.
You are strongly advised to flush out the system both cold and hot to the British Standard
BS 7593-2006 Code of practice, in order to remove system and installation debris.
It is also sensible to initially fire and commission the boiler before connecting any external
controls such as a room thermostat. By following this procedure, if you have a subse-
quent problem following the addition of an external control, you can eliminate the boiler
from your fault analysis.
If the boiler is fitted with a digital programmer, when setting the times for automatic opera-
tion, remember that for every “ON” time there must be an “OFF” time to follow and that
on every occasion you enter a time you must also indicate which days that you want the
boiler to follow the timed settings.
Some products incorporate an anti cycling time delay. It is normal when first switching
the boiler on for the boiler to operate on heating for a few seconds then switch off. After
3 - 4minutes has elapsed the boiler will then re ignite and operate perfectly normally. The
ignition delay cycle does not prevent normal operation of the boiler to provide d.h.w.
If you are in any doubts as to the installation or operation of the boiler please read the
instruction manuals thoroughly and then if necessary contact Biasi UK for advice and as-
sistance.
Please remember that if you are in any doubt about the installation of this product you can
contact our Technical Helpline on tel. [phone].

- 7 -
TABLE OF CONTENTS
1 APPLIANCE DESCRIPTION. . . . . . . . . . . . 8
1.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2 Isolation valves. . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Controls panel . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.4 LCD general features . . . . . . . . . . . . . . . . . . . . 10
2 INSTRUCTIONS FOR USE . . . . . . . . . . . . 12
2.1 Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Refilling procedure . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 C.h. circuit temperature . . . . . . . . . . . . . . . . . . 13
2.5 Extinguishing . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 USEFUL ADVICE. . . . . . . . . . . . . . . . . . . . 16
3.1 Central Heating. . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Frost protection. . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3 Condensate drain. . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Periodic maintenance. . . . . . . . . . . . . . . . . . . . 16
3.5 External cleaning . . . . . . . . . . . . . . . . . . . . . . . 17
3.6 Operational faults . . . . . . . . . . . . . . . . . . . . . . . 17
3.7 Displaying in INFO mode . . . . . . . . . . . . . . . . . 18
3.8 Remote anomaly code . . . . . . . . . . . . . . . . . . . 19
3.9 Flue probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 TECHNICAL INFORMATION. . . . . . . . . . . 21
4.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2 Main diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3 Technical data Activ A12OV. . . . . . . . . . . . . . . 24
4.4 Technical data Activ A15OV. . . . . . . . . . . . . . . 26
4.5 Technical data Activ A20OV. . . . . . . . . . . . . . . 28
4.6 Technical data Activ A25OV. . . . . . . . . . . . . . . 30
5 GENERAL REQUIREMENTS . . . . . . . . . . 32
5.1 Related documents. . . . . . . . . . . . . . . . . . . . . . 32
5.2 Location of appliance . . . . . . . . . . . . . . . . . . . . 32
5.3 Flue system . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.4 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.5 Air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7 Condensate drain. . . . . . . . . . . . . . . . . . . . . . . 34
5.8 Water circulation (c.h.) . . . . . . . . . . . . . . . . . . . 35
5.9 Water treatment . . . . . . . . . . . . . . . . . . . . . . . . 39
5.10 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . 40
6 INSTALLATION . . . . . . . . . . . . . . . . . . . . . 41
6.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2 Precautions for installation . . . . . . . . . . . . . . . . 41
6.3 Installing the bracket. . . . . . . . . . . . . . . . . . . . . 42
6.4 Overall dimensions. . . . . . . . . . . . . . . . . . . . . . 43
6.5 Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.6 Central heating service connections. . . . . . . . . 43
6.7 Fitting the flue system. . . . . . . . . . . . . . . . . . . . 45
6.8 Choice of flue . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.9 Electric connection . . . . . . . . . . . . . . . . . . . . . . 47
6.10 Electric connection of pump . . . . . . . . . . . . . . . 49
6.11 Connecting the room thermostat or zone valves49
6.12 Connecting a system boiler to a cylinder . . . . . 51
6.13 Installation of the external temperature probe
(optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.14 Electric connection between the boiler and the
external probe. . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.15 Remote electric connection (optional) . . . . . . . 54
7 COMMISSIONING . . . . . . . . . . . . . . . . . . . 55
7.1 Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.2 Electrical installation. . . . . . . . . . . . . . . . . . . . . 55
7.3 Gas supply installation . . . . . . . . . . . . . . . . . . . 55
7.4 Initial filling of the system . . . . . . . . . . . . . . . . . 55
7.5 Condensate pipe and traps . . . . . . . . . . . . . . . 57
7.6 Checking the gas supply pressure . . . . . . . . . . 57
7.7 Checking the inlet pressure . . . . . . . . . . . . . . . 57
7.8 Lighting the boiler. . . . . . . . . . . . . . . . . . . . . . . 58
7.9 Enabling functioning of the external
temperature probe by the remote control. . . . . 59
7.10 Setting the K coefficient of the external
temperature probe . . . . . . . . . . . . . . . . . . . . . . 60
7.11 Setting the pump post-circulation . . . . . . . . . . . 62
7.12 Selecting the reignition frequency . . . . . . . . . . 64
7.13 Checking the ignition device. . . . . . . . . . . . . . . 66
7.14 Checking the flue system . . . . . . . . . . . . . . . . . 67
7.15 Checking the condensate drain pipe . . . . . . . . 67
7.16 Instructing the user. . . . . . . . . . . . . . . . . . . . . . 67
7.17 Adjustment of useful c.h. output (for ActivA
20OV - Activ A 25OV only) . . . . . . . . . . . . . . . . 67
7.18 Setting record . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8 GAS CONVERSION . . . . . . . . . . . . . . . . . 71
8.1 Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.2 Operations and gas setting. . . . . . . . . . . . . . . . 71
9 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . 73
9.1 Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.2 Dismantling the external panels . . . . . . . . . . . . 73
9.3 Reassembly the external panels . . . . . . . . . . . 74
9.4 Emptying the c.h. system . . . . . . . . . . . . . . . . . 74
9.5 Cleaning the condensing primary exchanger
and the burner . . . . . . . . . . . . . . . . . . . . . . . . . 75
9.6 Check the pressure of the heating expansion
vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
9.7 Checking the flue expulsion pipe . . . . . . . . . . . 76
9.8 Combustion analysis check . . . . . . . . . . . . . . . 76
9.9 Checking the condensate drain pipe . . . . . . . . 76
9.10 Visual inspection of appliance . . . . . . . . . . . . . 76
9.11 Checking the gas supply pressure . . . . . . . . . . 77
9.12 Water inhibitor concentration . . . . . . . . . . . . . . 77
9.13 Setting the boiler chimney sweep function . . . . 77
Abbreviations used in the manual:
C.h. = Central heating
D.h.w. = Domestic hot water
D.c.w. = Domestic cold wate
Appliance category: II2H3P (gas G20 20 mbar, G31 37 mbar)
Country of destination: United Kingdom (GB) Ireland (IE)
This appliance conforms with the following EEC directive:
Gas Directive 2009/142/CE
Boiler Efficiency Directive 92/42/CEE
Electromagnetic Compatibility Directive 2004/108/CE
Low Voltage Directive 2006/95/CE
The manufacturer, in the continuous process to improve his products, reserves the right to modify the data expressed
in the present documentation at any time and without prior notice.
The present documentation is an informative support and it can not be considered as a contract to-wards third parties.

- 8 -
USE
APPLIANCE DESCRIPTION
1 APPLIANCE DESCRIPTION
1.1 Overview
The model and serial number of the boiler
are printed on bottom right side.
Fig. 1.1 1
2
6 4
1 Controls panel
2 House for possible time switch (c.h.
control)
1.2 Isolation valves
Fig. 1.2
3
5
6
7
4
*
8
3 Gas supply label
4 C.h. flow pipe
5 Gas inlet valve
6 C.h. return pipe
7 Condensate drain pipe
8 Main circuit drain pipe
*model and serial number of the boiler
label.

- 9 -
USE
APPLIANCE DESCRIPTION
1.3 Controls panel
Fig. 1.3 9
10
11
12
9 Reset/Stand-by/Winter key
10 C.h. temperature reduce key
11 C.h. temperature increase key
12 LCD display
RESET that takes all parameters
back to the factory value occurs
only by setting "parameter
08=04". Reset is displayed by
switch on of all symbols present
on the display.

- 10 -
USE
APPLIANCE DESCRIPTION
1.4 LCD general features
For the boiler technical informations refer to
the section "TECHNICAL INFORMATION"
to page 21.
Fig. 1.4
RESET
SET
°C
KEY The symbol indicates that the
boiler can be directly reactivat-
ed by the user, by pressing the
reset button
The symbol indicates that the
fault requires intervention on
behalf of specialised technical
assistance
All symbols represented with
lines that surround them, indi-
cate that the symbol is flashing
SIGNAL DISPLAYED BY THE LCD
LCD FUNCTION
Er 01+ Lack of burner ignition
on safety lockout
Er 02+ Safety thermostat
intervention lockout
Er 03+ General lockout
Er 10+ Flue probe intervention
lockout
Er 14+ Faulty pump or primary
temperature above
105°C
LCD FUNCTION
Er 15+
None or too low water
flow; Faulty pump
(temp. difference
between probes higher
than 35° C)
Er 16+
Possible exchange
of NTC probes (Flow
or Return) or pump
wrongly mounted (up-
side – down)
Er 17+ Faulty c.h. temp. probe
NTC (Flow or Return)
Er 18+ Faulty primary circuit
(no water or absence
of flow)
Er 04+
Faulty primary circuit
(no water or absence
of flow)
Er 05+ Faulty fan control
system
Er 06+ Faulty c.h. temp. probe
NTC flow
Er 08+ Faulty external temp.
probe NTC
Er 09+ Faulty flue temp. probe
NTC
Er 12+ Fauty c.h. temp. probe
NTC return
Boiler Stand-By
(anti-freeze protection
activated)
Boiler waiting for heat
request
Boiler in winter mode
The primary circuit
temperature is dis-
played.
Boiler on demand for
c.h. power.

- 11 -
USE
APPLIANCE DESCRIPTION
LCD FUNCTION
Burner ignition
(spark)
Flame present
(Burner on)
Boiler in anti-freeze
phase (bP flashing +
temperature flashing)
Boiler in antifrost
phase (AF flashing +
temperature flashing)
Set c.h.
(all other symbols are
disabled)
Pump activated for the
post-circulation phase
(Po flashing + tem-
perature flashing)
Delayed burner ignition
for setting the system
(uu flashing + tempera-
ture flashing)
LCD FUNCTION
Boiler in chimney
sweep functioning
mode.
The chimney sweep
is activated by setting
"parameter 09=01"
and is visualised by
the temperature digits
and the radiator+reset
symbols flashing alter-
natively.
Thermostat Delayed:
Boiler test performing
Useful output limita-
tion (temp. difference
between probes higher
than 25° C): Boiler test
performing
Flame detection error
(An flasching + error
flashing number)

- 12 -
USE
INSTRUCTIONS FOR USE
2 INSTRUCTIONS FOR USE
2.1 Warnings
Biasi UK Ltd support the Benchmark
initiative. The Benchmark Log Book is
located at the back of this manual and
should be completed by the Installing/
Commissioning Engineer and handed
over to the User for future reference by
other visiting Engineers.
Also included is the Service Interval
Record card that should be completed
by the Service Engineer following the
annual service maintenance of the boiler
and system.
All Gas Safe Registered Installers carry
a Gas Safe ID card, and have a registra-
tion number. Both should be recorded
in your Benchmark Log Book. You can
check your Installer is registered by call-
ing Gas Safe direct on 0800 408 5500,
or go on line at www.GasSafeRegister.
co.uk.
In order to guarantee safety and correct op-
eration, it is essential that all the tests are
carried out by a competent and responsi-
ble service engineer before lighting up the
boiler.
The tests are described in the installation
instructions in section 7 commissioning.
Ensure that the c.h. circuit is regularly filled
with water (even if the boiler is only used for
d.h.w. supply) checking that the pressure in-
dicated on pressure gauge is not lower than
that shown in Fig. 2.2.
If the pressure reading on the pressure
gauge is below that shown in Fig. 2.2, then
the system will require topping up. A filling
loop is normally provided by the Installer for
this purpose.
If you are in any doubt regarding this
procedure you are advised to contact
your Installer or an Approved Engineer.
This appliance is provided with a built in
anti-freeze system that operates the boiler
when the temperature is below 5 °C.
Therefore, when the boiler is not lit or used
in cold weather, with consequent risk of
freezing do not switch off the boiler at the
fused spur isolation switch or close the gas
inlet cock.
When you do not expect to use the boiler
for a long period and the boiler is not to be
used for frost protection then follow the in-
structions given in section "Extinguishing"
to page 14.
2.2 Refilling procedure
• Isolate the boiler from the electrical sup-
ply at the fused spur. Reconnect the filling
loop as demonstrated in Fig. 2.1.
Fig. 2.1
Control
valve
Double
check valve
Temporary
connection
Supply pipe
(cold water
inlet) Control valve
C.h. return pipe
• Open the valves of the filling loop and
watch the gauge until it reaches normal
filling pressure as shown in Fig. 2.2.
Fig. 2.2
Normal
filling
pressure

- 13 -
USE
INSTRUCTIONS FOR USE
If you experience any difficulty with the
operation of the boiler, switch off the
boiler immediately at the fused spur iso-
lation switch and contact your Installer
or an approved Service Engineer.
Air introduced into the boiler during this fill-
ing process will vent through the automatic
air purger fitted to the boiler. You may also
find it necessary to vent air from your radia-
tor circuit using your radiator key, however
be aware that excessive venting will cause
the pressure in the system to drop.
Always ensure that the pressure gauge is
set at the required pressure.
2.3 Ignition
• Check that the gas supply cock located in
the lower part of the boiler and the valves
are open Fig. 2.3.
Fig. 2.3
Open
position
• Turn on the electricity supply to the boil-
er, switching on the fused spur isolation
switch. The LCD display displays the state
within which the boiler is found (last mem-
orised) Fig. 2.4.
Fig. 2.4
°C
Stand-by
Winter
C.h. functioning
• Press the key 9for 2 seconds until
symbol appears on the display Fig. 2.5.
Fig. 2.5 9
10
11
12
The LCD display displays the boiler temper-
ature (primary circuit) and symbol;
the symbol slowly flashes Fig. 2.6.
Fig. 2.6
°C
2.4 C.h. circuit temperature
The output temperature of c.h. water can be
adjusted by acting on keys 10(reduce) and
11(increase) (Fig. 2.5) from a minimum of
about 25°C to a maximum of about 85°C.

- 14 -
USE
INSTRUCTIONS FOR USE
Press one of the two keys once to display
the "set" value. Press again to access the
modification.
Signal given by the LCD display:
• The heating hot water flow "set" temper-
ature and the symbol flash. The
background of the display is illuminated
(Fig. 2.7).
Fig. 2.7
°C
Adjustment of temperature WITHOUT
the external temperature probe (option-
al) fitted
Adjust the c.h. water flow as follows:
• from 25 to 35 with an external tempera-
ture included between 5 and 15°C
• from 35 to 60 with an external tempera-
ture included between -5 and +5°C
• from 60 to 85 with an external tempera-
ture less than -5°C.
Your qualified installer can recommend the
most indicated adjustments for Your sys-
tem.
The control of the set temperature reached
can be seen on the LCD display by means
of the missing symbol .
Power request in c.h. power.
When the boiler has a power request in the
c.h. mode, the symbol is displayed on
the display followed by an increase of the
c.h. water flow temperature. The
symbol flashes ( Fig. 2.8).
Fig. 2.8
°C
Adjusting the c.h. temperature with the
external temp. probe installed
When the external temp. probe (optional)
is installed your boiler automatically adjusts
the temperature of the c.h. system water
flow in relation to the external temperature.
In this case the boiler must be set by a qual-
ified installer (see "Setting the K coefficient
of the external temperature probe" to page
60).
However, if the ambient temperature is not
comfortable, the flow temperature of the
heating plant can be increased or reduced
by ± 15°C by acting on keys 10(reduce) and
11(increase) (Fig. 2.5).
2.5 Extinguishing
Press the key for 2 seconds 9(Fig. 2.9) until
the symbol appears on the display
(Fig. 2.10).
Fig. 2.9 9
10
11
12

- 15 -
USE
INSTRUCTIONS FOR USE
Fig. 2.10
If a long period of inactivity is envisioned:
• Switch off the electricity supply to the boil-
er, by means of the fused spur isolation
switch;
• Shut off the gas supply cock fitted under
the boiler and the valves for the water cir-
cuits Fig. 2.11;
Fig. 2.11
Close
position
• If necessary, empty the hydraulic circuits
see section "Emptying the c.h. system" to
page 74.

- 16 -
USE
USEFUL ADVICE
3 USEFUL ADVICE
3.1 Central Heating
For reasonably economical service install a
room thermostat. Never shut off the radia-
tor in the area where the room thermostat
is installed.
If a radiator (or a convector) does not heat
up, check that no air is present in it and that
its valve is open. If the ambient temperature
is too high, do not alter the radiator valves.
Reduce the central heating temperature in-
stead by means of the room thermostat or
by acting on the 10and 11heating adjust-
ment keys (Fig. 3.1).
Fig. 3.1 9
10
11
12
3.2 Frost protection
The anti-freeze system and any additional
protections protect the boiler from possible
damage due to frost.
This system does not guarantee protection
of the entire hydraulic system.
If the external temperature can reach val-
ues lower than 0°C, it is recommended that
the entire system is activated adjusting the
room thermostat at a low temperature.
The anti-freeze function is also activated
with the boiler in stand-by (Fig. 3.2).
Fig. 3.2
Therefore, when the boiler is not lit and
used in cold weather, with consequent risk
of freezing do not switch off the boiler at the
fused spur isolation switch or close the gas
inlet cock.
If the boiler is deactivated, have a qualified
technician empty the boiler, the c.h. sys-
tem.
3.3 Condensate drain
The condensate drain must not be modi-
fied or blocked. Blockage of the condensate
drain, caused by debris or freezing, can
cause automatic shutdown of the boiler. If
freezing is suspected and the pipe run is ac-
cessible an attempt may be made to free
the obstruction by pouring hot water over
the exposed pipe an cleaning any blockage
from the end of the pipe.
If this fails to remedy the problem the assist-
ance of a Gas Safe registered installer or in
IE acompetent person should be sought.
3.4 Periodic maintenance
For efficient and continuous operation of
the boiler, it is advisable to arrange mainte-
nance and cleaning by an Authorised Serv-
ice Centre Engineer, at least once a year.
During the service, the most important
components of the boiler will be inspected
and cleaned. This service can be part of a
maintenance contract. In particular, you are
advised to have the following checks car-

- 17 -
USE
USEFUL ADVICE
ried out:
• condensing heat exchanger
• burner;
• exhaust fume duct and flue;
• pressurisation of the expansion tank;
• filling up of the central heating circuit;
• bleeding of air from the central heating
system;
• general check of the appliance’s opera-
tion.
3.5 External cleaning
Before carrying out any clean-
ing, disconnect the appliance
from the electrical mains, using
the fused spur isolation switch
fitted adjacent to the appliance.
To clean the external panels, use a cloth
soaked in soapy water. Do not use solvents,
abrasive powders or sponges.
Do not carry out cleaning of the appliance
and/or its parts with readily flammable sub-
stances (for example petrol, alcohols, naph-
tha, etc.).
3.6 Operational faults
If the boiler does not function and a code
that alternates between the letter Er and the
writing reset (see "LCD general features" to
page 10) appear on the LCD display, it indi-
cates that the safety lock-out has stopped
the boiler. The display background flashes
(Fig. 3.3).
Fig. 3.3
RESET
RESET
For the first lighting up and following main-
tenance procedures for the gas supply, it
may be necessary to repeat the resetting
operation several times so as to remove the
air present in the pipe work.
Safety lock-out may occur even in case of a
blockage of the condensate drainage (e.g.
plugged drain pipe). It is advisable to check
the condensate drainage pipe and traps for
cleanness.
Press the reset key on the boiler control
panel 9(Fig. 3.1) to reset its functioning.
In this case and in case of per-
sistent lock-out call a competent
and responsible Service Engi-
neer.
Other operational faults signalled on the
LCD display
If the LCD display displays a code that al-
ternates between the letter Er and the
symbol, the boiler has an anomaly that can-
not be reset.
The display background flashes (Fig. 3.4).

- 18 -
USE
USEFUL ADVICE
Fig. 3.4
In order to reset good function-
ing of the boiler, call a compe-
tent and responsible Service
Engineer.
Noise due to air bubbles are heard dur-
ing operation
You should check that the pressure on the
pressure gauge is not below the correct set-
ting.
If required, top up the system correctly, as
described in section "Refilling procedure" to
page 12 of this manual. Bleed any air pre-
sent in the radiators, if necessary.
The pressure on the pressure gauge has
gone down
It is necessary to top up the appliance with
water again, so as to raise the pressure to
an adequate level as described in the sec-
tion "Refilling procedure" to page 12 of this
manual. If topping up with water has to
be done very frequently, have the system
checked for leaks.
Water comes out of the pressure relief
valve
Check on the pressure gauge that the pres-
sure in the central heating circuit is not
close to 3 bars. In this case, temperature
rise in the circuit can cause the pressure
relief valve to open. So that this does not
happen and to decrease the pressure to a
normal value, it is advisable to vent some of
the water in the appliance through the bleed
valves present in the radiators.
Water should occasionally leak from the
boiler
Shut off the valves and call an Authorised
Service Centre Engineer.
In this case or in case of prob-
lems other than those men-
tioned here, switch off the boil-
er, as described in section
"Extinguishing" to page 14 and
call a competent and responsi-
ble Service Engineer.
3.7 Displaying in INFO mode
The INFO mode allows the display of some
information on the boiler functioning status.
In case of malfunctioning of the boiler, it may
be useful to communicate such information
to the Authorised Service Centre Engineer
so that the causes can be understood.
In order to access the INFO mode, press
keys 9and 11(Fig. 3.5) at the same time un-
til the letter di appears on the display that
alternates with a code (Fig. 3.6).

- 19 -
USE
USEFUL ADVICE
Fig. 3.5 9
10
11
12
Fig. 3.6
To scroll the values press 10(reduce) and
11(increase) keys. In order to exit the INFO
mode, hold keys 9and 11(Fig. 3.5) pressed
at the same time.
3.8 Remote anomaly code
If the boiler is connected to remote (option-
al), a code that indicates a boiler anomaly is
displayed in the centre of the display.
The anomaly in progress is indicated by a
numeric code followed by the letter E.
The table summarises the possible codes
displayed on the remote.
Anomaly Code
Lack of burner ignition 01E
Safety thermostat lockout 02E
General lockout 03E
Faulty primary circuit
(no water or absence ol flow) 04E
Faulty fan control system 05E
Faulty c.h. temp. probe NTC 06E
Faulty external temp. probe
NTC 08E
Faulty flue temp. probe NTC 09E
Flue probe intervention
lockout 10E
Flame detection error 11E
No circulation, of faulty
pump or intervention primary
temperature limit. 14E
None or too low water flow;
Faulty pump (temp. difference
between probes higher than
35° C)
15E
Possible exchange of NTC
probes (Flow or Return)
or pump wrongly mounted
(upside – down)
16E
Faulty c.h. temp. probe NTC
(Flow or Return) 17E
Faulty primary circuit (no
water or absence of flow) 18E
3.9 Flue probe
The flue probe 14indicated in Fig. 3.7 is
a safety device. This intervenes when the
flue temperature exceeds 110°C placing the
boiler in safety block switching it off.
To reset normal boiler functioning, just press
the 9(Fig. 3.5) key.

- 20 -
USE
USEFUL ADVICE
Fig. 3.7
14