Beretta NOVELLA 55 RAI User manual

NOVELLA
55-64-71 RAI
BOILERS
CAST IRON
BASE
INSTALLATION MANUAL

INSTALLATION MANUAL
2
The following symbols are used in this manual:
b CAUTION! = Indicates actions that require caution and adequate preparation
a STOP! = Identifies actions that you MUST NOT do
Novella boilers conform to the basic requirements of the following directives:
• Gas Appliances Directive 2009/142/CE
• Boiler Efficiency Directive 92/42/CEE
(✫✫)
• Electromagnetic Compatibility Directive 2004/108/CE
• Low Voltage Directive 2006/95/CE
Novella boilers are therefore CE marked.
0694

3
CONTENTS
1 SAFETY INFORMATION AND PRECAUTIONS ...................................................4
2 DESCRIPTION OF THE APPLIANCE ........................................................ 5
2.1 Description .........................................................................................................................................5
2.2 Optional accessories .........................................................................................................................5
2.3 Main parts of the boiler ......................................................................................................................6
2.4 Control panel .....................................................................................................................................6
2.5 Technical specifications .....................................................................................................................7
2.6 Identification .......................................................................................................................................8
2.7 Material supplied ................................................................................................................................8
2.8 Handling .............................................................................................................................................9
2.9 Overall dimensions and water fittings...............................................................................................10
2.10 Water circuit .....................................................................................................................................10
2.11 Wiring diagram .................................................................................................................................12
3 INSTALLATION ......................................................................................... 13
3.1 Installation standards .......................................................................................................................13
3.2 Place of installation ..........................................................................................................................13
3.3 Installation in existing systems ........................................................................................................13
3.4 Water connections ...........................................................................................................................14
3.5 Electrical connections .......................................................................................................................14
3.6 Gas connections ...............................................................................................................................16
3.7 Gas supply conversion .....................................................................................................................16
3.8 Flue gas vent and air intake .............................................................................................................18
3.9 Filling the water circuit ......................................................................................................................19
3.10 Emptying the water circuit ................................................................................................................19
4 START-UP AND FUNCTIONING .............................................................. 20
4.1 Preliminary checks............................................................................................................................20
4.2 Ignition ..............................................................................................................................................20
4.3 Final checks......................................................................................................................................22
5 SHUT-DOWN ............................................................................................ 23
6 MAINTENANCE ....................................................................................... 24
6.1 Scheduled maintenance ...................................................................................................................24
6.2 Extraordinary maintenance...............................................................................................................24
7 OPTIONAL ACCESSORIES ..................................................................... 25
8 NOVELLA BOILERS: MODULAR CONFIGURATION ............................ 26
8.1 Configurations...................................................................................................................................26
8.2 Overall dimensions ...........................................................................................................................27

INSTALLATION MANUAL
4
1 SAFETY INFORMATION AND PRECAUTIONS
b This manual and the operation manual
associated with it form integral parts
of the product. Make sure that they are
always kept with the boiler even if it is
transferred to another owner or user, or
re-installed elsewhere. If you damage or
lose this manual, order a replacement
immediately from your local Technical
Assistance Service.
b The boiler must only be installed and
serviced by qualified personnel, in con-
formity to applicable legislation (in Italy,
law 46 of the 05/03/1990) and applica-
ble technical standards (in Italy, UNI-
CIG 7129 and 7131 standards and
subsequent updates thereto).
b The boiler must only be used for the pur-
pose for which it is designed. The manu-
facturer declines all responsibility, con-
tractual or other, for damage to property
or injury to persons or animals caused
by improper installation, adjustment,
maintenance or use.
b As soon as you open the packaging,
check immediately that the contents are
all present and undamaged. Contact the
reseller from whom you purchased the
product if you notice any problems.
b The safety valve must be connected to
a suitable collection and drain system.
The manufacturer declines all responsi-
bility for damage caused by the opera-
tion of an improperly connected safety
valve.
b The following instructions must be pas-
sed on to the user on installation of the
boiler.
- If water leaks from the boiler, turn off the
water supply and contact the manufactu-
rer’s Technical Assistance Service imme-
diately.
- Periodically check that operating pressu-
re in the water circuit is over 1 bar. If
necessary, contact the manufacturer’s
Technical Assistance Service to arrange
servicing by professionally qualified per-
sonnel.
- If the boiler is not going to be used for an
extended period of time, contact the
manufacturer’s Technical Assistance
Service to have at least the following ope-
rations performed:
• Switch the boiler OFF at the control
panel and at the mains power switch
• Close the boiler’s fuel cock, central
heating circuit shut-off cock and dome-
stic hot water circuit shut-off cock
• Empty the central heating circuit and
domestic hot water circuit if there is any
risk of freezing
- The boiler must be serviced at least once
a year. Servicing must be arranged in
advance with the manufacturer’s
Technical Assistance Service
Observe the following precautions to ensure
safe operation of the boiler.
aDo not allow children or uninformed per-
sons to operate the boiler.
aDo not operate any electrical devices or
equipment, including switches or dome-
stic appliances, etc., if you can smell
fuel or fumes. In the event of a gas leak,
thoroughly ventilate the room by opening
wide all doors and windows, close the
gas shut-off valve and call the manu-
facturer’s Technical Assistance Service
immediately to arrange urgent assistan-
ce by professionally qualified personnel.
aDo not touch the boiler while barefoot or
wet.
aNever clean the boiler without first
disconnecting it from the mains electri-
city supply by turning the mains power
switch and the control panel switch OFF.
aDo not tamper with or adjust the boiler’s
safety or control devices without prior
authorisation and instructions from the
manufacturer.
aDo not pull, disconnect, or twist the elec-
trical cables coming from the boiler even
if it is disconnected from the mains elec-
tricity supply.
aDo not obstruct or restrict vents in
the room where the boiler is installed.
Adequate ventilation is essential for cor-
rect combustion.
aDo not store containers of flammable
substances in the room where the boiler
is installed.
aDo not leave items of packaging within
the reach of children.

5
2 DESCRIPTION OF THE APPLIANCE
2.1
Description
Novella RAI boilers are gas fuelled boilers for
domestic heating. They are equipped with an
atmospheric burner and a cast iron primary
heat exchanger.
They incorporate an open (type B11BS) com-
bustion chamber and are fitted with a hood
that ensures proper flue gas venting even with
a fluctuating flue draught.
They are also equipped with a flue gas ther-
mostat, as required by applicable safety stan-
dards. The burner is a stainless steel unit with
stabilised flame and smooth ignition.
The burner is fitted with an ionisation type
flame detection system.
The boiler’s control and safety devices con-
form to applicable technical and safety stan-
dards and are enclosed in a functional control
panel integrated in the body of the appliance
Novella boilers use total shut-down logic
and do not waste energy because they only
start up when heat is actually needed by the
central heating system (i.e. when the room
thermostat trips).
Novella boilers can be connected to a sto-
rage cylinder to produce domestic hot water,
and can be equipped with temperature con-
trollers in the form of specific accessories.
Installation, maintenance and access to inter-
nal components is facilitated by a large front
panel.
The key features of these boilers include:
- electronic ignition with ionisation flame
detection
- adjustable smooth ignition
- gas supply solenoid valve with built-in pres-
sure stabiliser and double shutter for burner
control
- domestic hot water temperature control
- water circuit temperature and pressure
gauge
- provision for room thermostat or timer.
2.2
Optional accessories
- Wall-mounted weekly timer thermostat (part
number 1100279)
- High head pump kit (part number 1100269)
- RO120 storage cylinder (part number
696339)
- Pump or valve controlled multizone central
heating kit with total shut-down function
(part number 696439).

INSTALLATION MANUAL
6
7
8
9
10
11
1
2
3
4
6
5
Fig. 2.2
Fig. 2.1
Key
1 Control panel
2 Temperature sensor socket
3 Gas pressure switch (minimum pressure)
4
Electronic ignition and flame detection unit
5 Gas supply solenoid valve
6 Ignition electrode
7 Water circuit drain cock
8 Flame detection sensor
9 Burner
10 Boiler body
11 Name plate
171819
12 13 14 15 16
20 19
Key
12 Main switch
13 Central heating temperature control
14 Central heating temperature gauge
15 Safety thermostat (manual reset)
16 Flue gas thermostat (manual reset)
17 “Burner lockout” LED warning light
18 “Power on” LED indicator
19 Quick reference guide
20 Burner reset button
2.3
Main parts of the boiler
2.4
Control panel

7
2.5
Technical specifications
55 RAI 64 RAI 71 RAI
Rated heat input, CH kW 61,0 70,5 79,0
kcal/h 52460 60630 67940
Rated heat output, CH kW 55,0 63,5 71,1
kcal/h 47300 54600 61150
Electrical consumption W 23
Boiler class II 2H3+
Power supply voltage V ~ Hz 230 ~ 50
Index of protection IP 40
Losses from stack and casing with burner off % 1,12 1,26 1,05
Central heating circuit characteristics
Maximum pressure - temperature bar -°C 3 - 100
CH temperature setting range °C 34-82
Gas pressure
Rated gas pressure, methane (G 20) mbar 20
Rated gas pressure, LPG (G31) (G 30 - G 31) mbar 28-30/37
Water connections
CH flow - return Ø1" 1/4
Gas inlet Ø1/2" 3/4"
Emissions with G 20 gas
CO below p.p.m. 34 31 52
CO2 % 4,90 5,75 5,70
NOx (according to EN 297) Class 1
 FluegasΔt °C 113 123 130
Boiler dimensions
Height mm 850
Width mm 450
Depth mm 712 795 878
Weight of boiler kg 190 225 251
PARAMETER 55 RAI 64 RAI 71 RAI
Lower Wobbe index (at 15°C-1013 mbar) G20 (MJ/m3) 45,7
(at 15°C-1013 mbar) G30 (MJ/m3) 80,9
(at 15°C-1013 mbar) G31 (MJ/m3) 71,0
Rated supply pressure G20
mbar (mm H2O) 20 (203,9)
G30
mbar (mm H2O) 28 (285,5)
G31
mbar (mm H2O) 37 (377,3)
Minimum supply pressure G20
mbar (mm H2O) 13,5 (137,7)
G30
mbar (mm H2O) -
G31
mbar (mm H2O) -
Main burner
2 nozzles G20 Ø mm 4,60 5,00 5,40
G30 Ø mm 2,60 2,85 3,00
G31 Ø mm 2,60 2,85 3,00
Maximum pressure downstream from valve in central
heating only mode
G20 mbar Δp12,5 12,8 12,5
mm H2O Δp127 130 127
G30 mbar Δp25,5 25,5 24,5
mm H2O Δp260 260 250
G31 mbar Δp34,0 34,5 34,0
mm H2O Δp346 351 346
Maximum gas ow rate, CH (*) G20 m3/h 6,40 7,40 8,29
G30 kg/h 4,50 5,50 6,20
G31 kg/h 4,50 5,50 6,20
(*) Temperature 15°C; Pressure 1013 mbar

INSTALLATION MANUAL
8
2.6
Identification
Novella boilers are identified by a product
name plate giving the boiler’s serial number,
model and main technical and performance
data.
b It is essential to specify the correct
model of boiler when ordering spare
parts or requesting technical assistance.
If the name plate or any other means of
clearly identifying the product is defa-
ced, removed or lost, proper installation
and servicing may be rendered difficult.
Fig. 2.4
2.7
Material supplied
The boiler is delivered in a wooden cage.
Proceed as follows to remove this.
- Remove the staples fixing the wooden cage
to the pallet.
- Lift off the wooden cage.
The following items are delivered in a plastic
bag inside the boiler:
- Operation manual
- Installation manual
- LPG conversion kit (nozzles, label, seals)
- 2 lifting plates.
Instruction manuals are integral parts of the
boiler. On unpacking, locate the manuals and
keep them safe.
Novella boilers come with a back draught
shutter in a separate box.
GAS FUELLED BOILER
OBLIGATORY GROUND CONNECTION
Model
Code
Year
Heat input at
furnace (Qn/Hi)
Boiler water
capacity
Useful heat
output (Pn)
Heat exchanger
surface area
Maximum working
pressure (mwp)
Maximum admissible
temperature
Power supply Maximum current
draw
NOx class Maximum energy
consumption
Gas supply pressure
CLASS OF BOILER
TYPE OF BOILER
COUNTRY OF DESTINATION
Index of protection
PIN Code
Serial No.
MODEL
55 RAI 64 RAI 71 RAI
Net weight 190 225 251 kg
Gross weight 207 243 271 kg
Fig. 2.3

9
P
C
Fig. 2.5
2.8
Handling
Once you have removed the packaging, pro-
ceed as follows to handle the boiler:
- Remove the screws securing the boiler to
the wooden pallet.
- Remove the front panel (P) and top panel
(C) from the casing (fig. 2.5).
- Unscrew the nut (A) from the top front tie-
rod (fig. 2.6).
- Fit one of the lifting plates (B) over the end
of the tie-rod (C) (fig. 2.6).
- Screw the nut (A) back on (fig. 2.6).
- Unscrew the nut (D) from the top rear tie-rod
(fig. 2.7).
- Fit the second lifting plate (E) over the end
of the tie-rod (F). Make sure that the second
lifting plate is diagonally opposite that fitted
previously (fig. 2.7).
- Screw the nut (D) back on (fig. 2.7).
- Lift the boiler using a 1" pipe (G) inserted
through the two lifting plates (fig. 2.8).
- Once the boiler is in its final installation posi-
tion, reverse the above steps to remove the
two lifting plates. Securely tighten the nuts.
b Wear suitable personal protective
equipment and use suitable safety devi-
ces.
aDo not leave items of packaging within
the reach of children.
A
B
C
Fig. 2.6
D
E
F
Fig. 2.7
G
Fig. 2.8

INSTALLATION MANUAL
10
2.9
Overall dimensions and water fittings
Fig. 2.9
DESCRIPTION MODEL
55 RAI 64 RAI 71 RAI
A 712 795 878 mm
B 260 302 342 mm
C 1475 1475 1700 mm
2.10
Water circuit
RI
MI
GAS
A
B
CD
A Water circuit drain cock
B Water circuit temperature control
sensor
C Safety thermostat temperature
sensor
D Water circuit temperature gauge
sensor
MI CH flow
RI CH return
GAS Gas supply
Fig. 2.10

11
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
200 300400 500600 700800 9001000 1100 1200 1300 1400 1500
Novella 55 RAI
Novella 64 RAI
Novella 71 RAI
Boiler’s water-side pressure drop
Novella RAI boilers come without a pump. A
pump must therefore be provided as part of
the installation.
In order to choose a pump of the right size,
bear in mind the boiler’s water-side pressure
drop, as shown in the following graph.
b On initial start-up and at least every year,
check that all the pumps in the system
rotate freely. Sludge and limescale can
build up and cause seizure, especially
after long periods of disuse.
aNever run the pump dry.
Fig. 2.12
Fig. 2.11
Pressure drop (m approx.)
Flow rate (l/h)

INSTALLATION MANUAL
12
2.11
Wiring diagram
IG Main switch
TF Flue gas thermostat (manual reset) FU Fuse PI CH pump
LV Green “power on” LED indicator
AP Ignition and flame detection unit
LR Red “burner lockout” LED warning light
VG Gas supply solenoid valve
Fig. 2.13
RS Burner reset button
EA Ignition electrode
TR Central heating temperature control
ER Flame detection sensor
TS Safety thermostat (manual reset) P1 Gas pressure switch

13
3 INSTALLATION
3.1
Installation standards
L'installazione dev'essere eseguita da per-
sonale qualificato in conformità alle seguenti
normative di riferimento:
- UNI-CIG 7129
- UNI-CIG 7131
- CEI 64-8.
Installers must also ensure conformity to fire
prevention standards, gas safety standards
and local bylaws.
3.2
Place of installation
Novella RAI boilers must be installed in boiler
rooms with vents that conform to applicable
technical standards and safety legislation.
aBoilers must be installed indoors. They
are not designed for outdoor use and
are not fitted with automatic frost protec-
tion devices.
IMPORTANT
Before installing the boiler, thoroughly flush
out all pipes to remove any dirt and deposits
that could compromise the correct functioning
of the boiler. Install a water collector under
the safety valve and connect it to the nearest
drain to evacuate any water coming out of the
safety in the event of overpressure.
The domestic hot water circuit does not requi-
re a safety valve but the installer should never-
theless check that the water supply pressure
does not exceed 6 bar. If necessary, install a
pressure reducer.
Before lighting the burner for the first time,
make sure that the boiler is configured for
use with the type of gas supplied. The type
of gas is specified on the packaging label
and on the boiler’s own name plate.
Make sure that the flue is able to withstand
the temperature of the flue gases and that it
has been designed and made in conformity to
applicable standards. The flue must also be as
straight as possible, sealed, insulated and not
blocked or choked.
3.3
Installation in existing systems
Perform the following checks before installing
Novella RAI boilers in existing systems.
- Check that the flue is large enough and
suitable for the characteristics of the boiler.
- Check that the characteristics of any exi-
sting central heating pump are suitable for
the boiler (see the graph on page 11).
- Make sure that the central heating circuit
has been flushed out to remove all sludge
and limescale, and that it has been properly
de-aerated.
- Make sure that the system is fitted with
safety and control devices that conform to
applicable legislation and standards.
- Check the hardness of the water supply
to ascertain whether a softening system is
required. Refer to the following values.
REFERENCE VALUES
pH 6-8
Electrical conductivity less than 200 mV/cm (25°C)
Chlorine ions less than 50 ppm
Sulphuric acid ions less than 50 ppm
Total iron less than 0,3 ppm
Alkalinity M less than 50 ppm
Total hardness 35° F
Sulphur ions none
Ammonia ions none
Silicon ions less than 30 ppm

INSTALLATION MANUAL
14
MI
RI
3.4
Water connections
Novella boilers are designed and made for
use in central heating systems, but can also
be used to generate domestic hot water if
connected to a suitable storage cylinder.
The specifications of the water fittings are as
follows:
MI CH outlet Ø 1”1/4 F
RI CH return Ø 1”1/4 F
b The “RO120 storage cylinder water
connections kit” (part number 596369)
adapts the boiler’s water connections to
a different diameter:
MI CH flow Ø 3/4” F
RI CH return Ø 3/4” M
b The choice of system components and
the method of their installation are left
up to the heating engineer installing the
system. Installers must use their experti-
se to ensure proper installation and fun-
ctioning in conformity to all applicable
legislation.
b Circuits filled with anti-freeze must be fit-
ted with water disconnectorsrici.
3.5
Electrical connections
Il collegamento alla rete elettrica deve essere
realizzato tramite un dispositivo di separazio-
ne con apertura onnipolare di almeno 3 mm.
L'apparecchio funziona con corrente alternata
a 230 V~50 Hz, ha una potenza elettrica di
150 W ed è conforme alla norma EN 60335-1.
b The following instructions are mandatory:
- Install a multi-pole magnetic thermal
trip switch and disconnector confor-
ming to IEC-EN standards (with a con-
tact gap of at least 3 mm).
- Respect the polarity of the L1 (Phase)
- N (Neutral) connections.
- Use cables with insulation and cross
section conforming to applicable stan-
dards (minimum cross section 1.5
mm2).
Fig. 3.1
- Always refer to the electrical wiring dia-
grams in this manual when performing
any electrical work.
- Ensure that an efficient ground con-
nection is provided.
aIt is strictly forbidden to use fuel and/
or water pipes to ground the appliance.
The manufacturer declines all respon-
sibility for damage caused by failing to
ground the appliance adequately.

15
Fig. 3.2
Fig. 3.3
Fig. 3.4
- Unscrew the two fixing screws and remove
the protective cover (A) from the casing
(fig. 3.2).
- The electrical connection terminals are
located underneath (fig. 3.3).
- Connect up the (optional) room thermostat
and/or timer as shown in the electrical
wiring diagrams in this manual.
- Connect up the electrical power supply
(fig. 3.3)
- Connect up the room thermostat (TA) (fig.
3.4).
b If a room thermostat is connected, remo-
ve the bridge from terminals 4-5.
b The contacts of the room thermostat
must be able to function at a voltage of
230 V, 50 Hz.

INSTALLATION MANUAL
16
3.6
Gas connections
Novella boilers must be connected to the
methane or LPG gas supply in conformity to
applicable standards (fig. 3.5).
Perform the following checks before making
the connection.
- Check that the boiler is compatible with the
type of gas supply.
- Check that the gas supply pipes are thorou-
ghly clean.
Fit a suitably sized filter in the gas supply pipe
if the gas supply contains any solid particles.
b The gas supply line must be suitable for
the flow rate demanded by the burner.
The gas supply must also be equipped
with all the necessary safety and control
devices required by applicable legisla-
tion and standards.
b On completion of the installation, check
that all joints are sealed in conformity to
the relevant installation standards.
3.7
Gas supply conversion
The boiler comes ready for use with methane
gas (G20), but can be converted to work with
LPG (G30/G31) using the conversion kit pro-
vided and the LPG gas valve contained in the
relevant kit (part number 1102259). Conversion
must be performed by the manufacturer’s
Technical Assistance Service. The boiler can
be converted even after installation. To do so,
proceed as follows.
REPLACING THE NOZZLES
- Remove the front panel from the casing.
- Unscrew the two nozzles from the methane
burner and replace them with the LPG noz-
zles, using the aluminium seals provided in
the kit (fig. 3.6).
DISABLING THE PRESSURE REGULATOR
For the boiler to work with LPG fuel, the pres-
sure regulator on the valve group needs to be
disabled. To do so, proceed as follows:
- Remove the plug (1).
- Screw the pressure regulator screw (2) all
the way in (fig. 3.7).
- Unscrew the pressure measurement point
screw (A) about 3 turns and connect up the
pressure gauge (fig. 3.7).
- Instead of the plug (1), fit the blind plug pro-
vided in the conversion kit (fig. 3.7).
GAS
Fig. 3.5
Fig. 3.6
GAS - Gas supply
2
1
A
Fig. 3.7

17
ADJUSTING THE GAS PRESSURE SWITCH
- Unscrew the screws (B) securing the pres-
sure switch cover (fig. 3.8).
- Adjust the pressure switch knob (C) to 20
mbar (fig. 3.9).
- Fit the cover back on and secure it with the
screws removed previously.
Start up the boiler as instructed on page 20.
NOZZLE PRESSURE
- Adjust the pressure regulator on the LPG
supply until the pressure gauge reads out
the value specified in the table below (fig.
3.11):
55 RAI 64 RAI 71 RAI
G30 G31 G30 G31 G30 G31
25,5 34,0 25,5 34,5 24,5 34,0
mbar
- Disconnect the pressure gauge and close
the pressure measurement point.
- Check the tightness of all the joints discon-
nected previously.
- Apply the LPG label supplied with the boiler
to the inside of the boiler casing (fig. 3.11).
- Remove any METHANE (G20) labels from
the outside and inside of the boiler casing
(fig. 3.11).
C
B
_ _
Boiler configured for:
Country of destination: ....
G30+G32 28-30/37 mbar L.P.G.
Country of destination:
_ _ _ _ _ _
Fig. 3.10
Fig. 3.9
Fig. 3.8
Fig. 3.11

INSTALLATION MANUAL
18
3.8
Flue gas vent and air intake
Flues and stack connections must be made in
conformity to all applicable local and national
laws and standards. The use of rigid pipes is
mandatory.
All joints between pipe sections must be her-
metically sealed and all parts of the flue must
be resistant to high temperatures, condensate
and mechanical stress.
b Novella boilers are equipped with a flue
gas thermostat, located inside the hood.
This thermostat shuts down the boi-
ler immediately in the event of flue gas
blowback.
b Uninsulated flue pipes are potentially
dangerous and can cause burns.
The back draught shutter supplied with
Novella boilers must be fitted correctly along
with the flue gas thermostat. To do so, pro-
ceed as follows.
- Fit the collar (C) to the flue gas exhaust hole
in the top panel of the casing (fig. 3.13)
- Push the back draught shutter (B) through
the collar (C) and into its seat in the flue gas
hood (fig. 3.13)
- Insert the flue gas thermostat (S) (attached
to the back of the boiler), into the socket in
the back draught shutter and fix it in place
with the nut (fig. 3.14).
A
225
225
Øi
B
C
S
Fig. 3.12
Fig. 3.13
Fig. 3.14
DESCRIPTION MODEL
55 RAI 64 RAI 71 RAI
A 260 302 342 mm
ØI 182 182 202 mm

19
RI
3.9
Filling the water circuit
Novella series boilers must be fitted with a
water circuit filling system connected to the
boiler return line (fig. 3.15).
- Make sure that the boiler drain cock is clo-
sed before attempting to fill the boiler (fig.
3.16)
- Open the water circuit shut-off cocks and
slowly fill the circuit until the pressure gauge
reads out a value of 1.5 bar (cold).
- Close the water circuit shut-off cocks (fig.
3.17).
RI
Fig. 3.15
Fig. 3.16
Fig. 3.17
ON
OFF
Fig. 3.18
Fig. 3.19
3.10
Emptying the water circuit
- Turn the electricity supply off by switching
the boiler’s mains power switch and con-
trol panel switch OFF (0) before starting to
empty the boiler (fig. 3.18).
- Make sure that the water circuit shut-off
cocks are closed.
- Connect a rubber hose to the hose union on
the boiler’s drain cock and open the cock
(fig. 3.19).

INSTALLATION MANUAL
20 Fig. 4.1
Fig. 4.2
Fig. 4.3
4 START-UP AND FUNCTIONING
4.1
Preliminary checks
Remove the front panel of the boiler and per-
form the following checks before switching
the boiler on or testing any of its functions.
- Check that the fuel and water circuit shut-off
cocks are open
- Check that the type and pressure of the gas
supply are as specified for the boiler.
4.2
Ignition
Once you have completed all the preparatory
steps, proceed as follows to start up the boiler
for the first time.
- Turn the boiler’s mains power switch ON
(fig. 4.1)
- Set the room thermostat to the required
temperature (~ 20°C) or, if the system has
a timer or timer-thermostat, make sure that
this is switched “On” and adjusted to the
required temperature (~ 20°C) (fig. 4.2)
- Adjust the boiler’s temperature control to the
desired temperature (operation not neces-
sary if the boiler has been equipped with a
temperature controller) (fig. 4.3)
- Switch the boiler on at the control panel
switch and check that the green power indi-
cator lights (fig. 4.4).
- Check that the water circuit pressure gauge
shows a pressure over 1 bar with the system
cold. Check also that the central heating
circuit is properly de-aerated.
- Check that the pressure in the central hea-
ting circuit expansion vessel is sufficient
(about 1 bar).
- Check that the electrical connections to the
mains supply and to the system’s control
and safety devices have been made cor-
rectly.
- Check that the flue is properly constructed.
Fig. 4.4