LAMBORGHINI XILO T 20 N MS W TOP Manual

1
MANUALE DI
INSTALLAZIONE E
MANUTENZIONE
INSTALLATION
AND MAINTENANCE
MANUAL
MANUAL PARA
LA INSTALACIÓN Y
EL MANTENIMIENTO
MANUAL DE
INSTALAÇÃO E
MANUTEN
Ç
ÃO
20 N MS W TOP U/IT
AZIENDA CERTIFICATA ISO 9001
PREGASI CONSEGNARE
L'INSERTO "MANUALE D'USO"
AL SIG. UTENTE
PLEASE MAKE SURE THAT THE
"USE MANUAL" IS HANDED
OVER TO THE USER
TENGAN LA AMABILIDAD DE
ENTREGARLE AL USUARIO EL
"MANUAL DE USO"
FAVOR ENTREGAR O
"MANUAL DE USO"
AO SR. UTENTE
CALDAIA MURALE A GAS TERMO - ALTO RENDIMENTO - MODULANTE
WALL-HUNG GAS BOILER FOR HEATING - HIGH EFFICIENCY - MODULATING
CALDERA MURAL A GAS PARA CALEFACCIÓN - ALTO RENDIMIENTO - MODULANTE
CALDEIRA DE PAREDE A GÁS PARA CALEFACÇÃO - ALTO RENDIMENTO - MODULANTE

Read carefully all warning and instructions contained in this manual at they give important
safety instructions regarding installation and maintenance. Keep this manual for future
reference.
Installation must be carried out by qualified personnel who will be responsible for respecting
existing safety regulations.
GB
ENGLISH

26
Congratulations...
......on an excellent choice. We thank you for the preference accorded to our products.
LAMBORGHINI CALORECLIMA has been actively present in Italy and throughout the world since
1959 with a widespread network of agents and concessionary agents to constantly guarantee the
presence of our product on the market.
Alongside this is the support of a technical service, “LAMBORGHINI SERVICE”, which is entrusted
with the qualified servicing of the product.
For the installation and positioning of the boiler:
CAREFULLY OBSERVE THE LOCAL REGULATIONS IN FORCE
INDEX PAGE
GENERAL INSTRUCTIONS ______________________________________________27
DESCRIPTION_________________________________________________________28
MAIN COMPONENTS _________________________________________________29
DIMENSIONS_________________________________________________________30
TECHNICAL FEATURES _________________________________________________30
GAS - NOZZLE CALIBRATION ___________________________________________31
ELECTRICAL CONNECTIONS - WIRING DIAGRAMS ________________________32
MALFUNCTIONS AND ADJUSTMENTS ___________________________________36
WATER CONNECTION_________________________________________________37
WATER CIRCUIT _______________________________________________________38
INSTALLATION ________________________________________________________39
START-UP ____________________________________________________________39
FLUE EXHAUST CONNECTION __________________________________________40
FLUE EXHAUST INSTALLATION __________________________________________41
ADJUSTMENTS _______________________________________________________42
SWITCHING OFF______________________________________________________43
MAINTENANCE_______________________________________________________43
OPERATION WITH DIFFERENT TYPES OF GAS _____________________________45
FAULT-FINDING CHART ________________________________________________46

27
GENERAL INSTRUCTIONS
●This booklet constitutes an integral and essential part of the product.
Read carefully the instructions contained in this booklet as they provide important directions regarding the
safety of installation, use and maintenance. Preserve this booklet with care for any further consultation.
The installation of the boiler must be carried out in compliance with current regulations, according to the
instructions of the manufacturer and by qualified personnel. An incorrect installation can cause injury or
damage to persons, animals and objects, for which the manufacturer cannot be held responsible.
●After removing the packaging materials, check the content integrity. In case of doubt, do not use the unit
and contact the supplier. The packaging material (wooden crates, nails, clips, plastic bags, foam, etc.)
must not be left within reach of children as they are potential sources of danger.
●This boiler is designed to heat water to a temperature below boiling (atmospheric pressure). It must be
connected to a heating system compatible with its performances and output.
●This appliance should be destined only for the use for which it has been expressly envisaged. Any other
use is to be considered improper and therefore dangerous. The manufacturer cannot be considered
responsible for any damages caused from improper, erroneous or unreasonable use.
ALL INSTALLATION, MAINTENANCE AND GAS CONVERSION OPERATIONS MUST BE CARRIED OUT BY
AUTHORISED SKILLED TECHNICIANS.
TO ENSURE THAT BOILER IS INSTALLED CORRECTLY AND THAT IT FUNCTIONS PROPERLY, WE RECOMMEND
THAT ONLY LAMBORGHINI ACCESSORIES AND SPARE PARTS BE USED.
ON NOTICING THE SMELL OF GAS DO NOT TOUCH ANY ELECTRIC SWITCH. OPEN DOORS AND WIN-
DOWS. SHUT OFF THE GAS COCKS.
INSTALL THE BOILER ON WALLS WHICH ARE AS WIDE AS OR WIDER THAN THE BOILER ITSELF.

28
DESCRIPTION
These boilers are fully automatic and gas control is effected by an electronic control unit having the following
characteristics:
- continuous modulation mode on both circuits;
- possibility to adjust the heating output;
- possibility to adjust the slow ignition;
XILO T models are equipped with:
- no-water pressure switch;
- total safety thermostat;
- high efficiency bi-thermal flue gas exchanger;
- Hot water plate exchanger.
XILO T 20 N MS W TOP
Equipped with electronic control unit for automatic ignition and ionization electrode flame control.
To ensure safe operation, the electric fan is controlled by a pressure switch.
Flue gas exhaust can be made by means of the following:
- a flue pipe concentric with the air intake pipe;
- a double pipe, one for flue gas exhaust and the other for combustion air intake.

29
MAIN COMPONENTS
LEGEND
1 Fumes pressure switch
2 Fan
3 Heating sensor
4 Total safety thermostat
5 Exchanger
6 Burner
7 Ignition electrodes
8 Control electrode
9 Automatic air bleed valve
10 Safety valve
11 Circulator
12 Filling cock
13 Gas valve
14 Modulating coil
15 Gas pressure reading point
16 Expansion tank
17 Thermohydrometer
18 Malfunction warning light
19 ON/OFF warning light
20 Lock-out warning light
21
Fixed knob
22 Function selector
23 Heating adjustment
potentiometer
24 Taken combustion test
XILO T 20 N MS W TOP
12
4
16
15
3
14 13 12
5
8
6
9
10
11
17
23
22
21
181920
24
7
Fume analysis points

30
300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
600
500
400
300
200
100
Prevalenza residua
mbar
Portata (l/h)
DIMENSIONS mm
CIRCULATING PUMP FEATURES
System delivery/pressure
Boiler version: type B22-C12-C32-C42-C52-C62-C82 Max. water temperature 90°C
Rated gas pressure: G20 20 mbar
Category: II 2H3+ G30 28-30 mbar/G31 37 mbar
Cl NOx : 2
TECHNICAL FEATURES
Residual pressure
mbar
Delivery (l/h)
XILO T 20 N MS W TOP
100 Max. 3000 220
105
440
770
100 Max. 3000
160
330
MODEL
XILO T 20 MS
W TOP
Input Output Main system
Gas
Supply
kW kcal/h kW kcal/h
ØØØ
kg
26
Return
Ø
kW kW kcal/h
Cold water
inlet
Operating
pressure
max.
22.360 24 20640 12,1 10406 10,7 9202 3/4”3/4” 3/4” 1/2”
Thermal capacity Min. thermal capacity Connections
35
Input Output
kcal/h
Bar
3
lt
8
Expan-
sion
tank
Weight

31
The boilers leave the factory calibrated and ready to operate with G20 (Natural gas) and G30/G31 (LPG).
For proper calibration, see the table below:
BURNER PRESSURE CURVES - OUTPUT
GAS - NOZZLE CALIBRATION
Gas type
G20 20 mbar
(Natural gas)
G30 28-30 mbar
(LPG)
G31 37 mbar
(LPG)
Jets pressure mbar Burner
jets
Ø mm.
Delivery
XILO T 20 N MS
max.
11,4
24,4
32,4
1,9
4,6
6,9
min. m3/h
2,7
0,8
1
1,25
0,77
0,77
L.C.V.
kcal/h
8.550
29.330
22.360
XILO T 20 N MS
Slow ignition adjustment
3 mbar G20 (Natural Gas)
7,5 mbar G30/G31 (LPG)
Burner pressure intake

32
ELECTRICAL CONNECTIONS - WIRING DIAGRAMS
The boiler must be connected to an earthed, single-phase 230V-50 Hz mains supply by means of a three-wire
cable, ensuring that connections to the PHASE and NEUTRAL terminals are made correctly.
A bipolar switch must be used with contacts opening to at least 3 mm.
The power lead must only be replaced by another with the following characteristics: “HAR H05 VV-F” 3 X 1.00
mm2. (You are strongly advised to use original LAMBORGHINI accessories and spare parts only).
Installation must be made in compliance with safety REGULATIONS IN FORCE.
Grounde connections are compulsory. Connect the boiler to an efficient grounding system.
To gain access to the electrical panel which houses the power supply terminal block and any connection to a
room thermostat, proceed as follows:
Voltage
V
230
Frequency
Hz
●Disconnect the boiler power
supply
●Undo the two grating screws
(fig. 1)
●Undo the two jacket fixing
screws (fig. 2)
●Raise the jacket and then pull it
towards you (fig. 3)
●To access electrical and electronic
parts loosen screws A and pull
the entire panel outwards (fig.
4). Tilt downwards and undo the
screws B on the cover C
fig.3 fig.4
50
fig.1 fig.2
fig.5
A
A
B
c
Absorbed power
kW Noise level dB (A)
MS
46
Protection
index
IP
X 4D
MS
0,150

33
ASSEMBLY DIAGRAM XILO T 20 N MS W TOP - card code 4.56035.0
LEGEND
BM Modulating coil
CiR Heating circulator
EA Ignition electrode
EC Control electrode
F Fuse 2(A)
JP1 Methane/LPG selector
JP3 Post-circulation selector
JP4 Ignition limiting selector
JP5 Jumper to be cut for low temperature
JP6 Mono-thermal/bi-thermal switch
L Phase 230 V 50 Hz
N Neutral
PA Air pressure switch
PS No-water pressure switch
RLA Slow ignition power adjustment
Rmax. Heating max. power adjustment
SR Heating sensor
TA Room thermostat (if any)
TL Limit thermostat (if any)
TST Safety thermostat
VG Gas valve SIT 837
VG1 Gas valve Honeywell
VK 4105M
VN Fan
1 Heating potentiometer
2 Selector: Off
Winter
Reset
Test
3 Fixed knob
L
NJ1 F
J14
L1
TA
TL (BASSA TEMP.)
J6
JUMPER TO BE CUT
IF LIMIT THERMOSTAT
IS REQUIRED
J13
J9
J8
BM
JP4 JP2
JP3
RLA Rmax.
SR
PS
PANEL
CONNECTION
JP5
JP1
PA
CiR
J3
VG1
VG
J12
TST
EA
EC
J15
Lock-out warning light
ON/OFF warning light
Malfunction warning light
21
3
J4
VN
MODULATOR
Resist.
1 kohm
J10
MP
+ S
Warning: One of the two gas valves only, VG or VG1, is fitted on the boiler.

34
ASSEMBLY DIAGRAM XILO T 20 N MS W TOP - card code 4.55828.0
L
NJ1 F
J14 L1
CiR
J3
J15
TL
J6
J13
J9
J8
BM
JP4
JP3
RLA Rmax.
SR
PS
JP5 (BASSA TEMP.)
JP1
FC
TA
VG
J12
TST
J10
EA
EC
21
3
J4
VN
JUMPER TO BE CUT
IF LIMIT THERMOSTAT
IS REQUIRED
PANEL
CONNECTION
Lock-out warning light
ON/OFF warning light
Malfunction warning light
Resist.
1 kohm
MODULATOR
MP
+ S
LEGEND
BM Modulating coil
CiR Heating circulator
EA Ignition electrode
EC Control electrode
F Fuse 2(A)
JP1 Methane/LPG selector
JP3 Post-circulation selector
JP4 Ignition limiting selector
JP5 Jumper to be cut for low temperature
L Phase 230 V 50 Hz
N Neutral
PA Air pressure switch
PS No-water pressure switch
RLA Slow ignition power adjustment
Rmax. Heating max. power adjustment
SR Heating sensor
TA Room thermostat (if any)
TL Limit thermostat (if any)
TST Safety thermostat
VG Gas valve
VN Fan
1 Heating potentiometer
2 Selector: Off
Winter
Reset
Test
3 Fixed knob

35
ASSEMBLY DIAGRAM XILO T 20 N MS W TOP - card code 4.56040.0
L
NJ1 F
J14 L1
CiR
J3
J15
TL
J6
J13
J9
J8
BM
JP4
JP3
RLA Rmax.
SR
PS
JP5 (BASSA TEMP.)
JP1
FC
TA
JP6JP7
VG
J12
TST
VG1
EA
EC
Resist.
kohm
1
21
3
J4
VN
PANEL
CONNECTION
JUMPER TO BE CUT
IF LIMIT THERMOSTAT
IS REQUIRED
MODULATOR
Lock-out warning light
ON/OFF warning light
Malfunction warning light
J10
MP
+ S
LEGEND
BM Modulating coil
CiR Heating circulator
EA Ignition electrode
EC Control electrode
F Fuse 2(A)
JP1 Methane/LPG selector
JP3 Post-circulation selector
JP4 Ignition limiting selector
JP5 Jumper to be cut for low temperature
JP6 Mono-thermal/bi-thermal switch
JP7 Gas valve switch
L Phase 230 V 50 Hz
N Neutral
PA Air pressure switch
PS No-water pressure switch
RLA Slow ignition power adjustment
Rmax. Heating max. power adjustment
SR Heating sensor
TA Room thermostat (if any)
TL Limit thermostat (if any)
TST Safety thermostat
VG Gas valve SIT 837
VG1 Gas valve Honeywell
VK 4105M
VN Fan
1 Heating potentiometer
2 Selector: Off
Winter
Reset
Test
3 Fixed knob
Warning: One of the two gas valves only, VG or VG1, is fitted on the boiler.

36
MULFUNCTIONS AND ADJUSTMENTS
Should the boiler shut down it must be reset by rotating functions selector switch to position A.
B: see TEST functions at “Gas pressure adjustments with Honeywell VK 4105 valve”
B
A
Constant light:
Ignition shutdown
Fast flashing light:
TST shutdown
G30/G30
LPG G20
Natural Gas
(post.circ. off)
heating post.circ. on 2,5 min.
Heating timer off heating timer on 2,5 min.
JP5
JP4
JP3
JP1
Resistor jumper cut, floor heating temp. set to 30/40°C.
Resistor jumper uncut, temperature 35/80°C
Legend:
OffOn
JP6 Present: bi-thermal function
Absent (cut): mono-thermal function
cards only:
4.56035.0
4.56040.0
RLA
R max.
Increase
Increase
Slow ignition adjustment
Max. heating power adjustment
Constant light: No water
Fast flashing light: Sensor fault
Slowly flashing light:
Air pressure switch (MS)

37
WATER CONNECTION
Fit the supporting hooks and attach the assembly template, moving it up to the wall; fit all the pipes, starting
with the end pipe fittings already mounted on the template: system supply, system return, cold water, hot water,
any gas pipes and electric mains leads with room thermostat.
Once the pipes have been fitted, the end pipe fittings can be removed and ordinary caps fitted, ready for
hydraulic tests to be carried out. The template can be removed or, if left in place, will be embedded in the wall
once finishing operations have been completed (plaster and tiles); only the two supporting hooks will protrude
from the wall, as well as an opening for the connections. Attach the boiler to the hooks through the holes at the
back of the frame, pushing it up against the finished wall. Make the necessary hydraulic connections.
ADVICE AND SUGGESTIONS ON PREVENTING SYSTEM VIBRATION AND NOISE.
- Do not use pipes of reduced diameter.
- Do not use low-radius elbows or fittings that significantly reduce cross-section.
- Hot-flushing of the system is recommended in order to eliminate any impurities from the piping and radia-
tors (especially oil and grease) which might damage the circulator.
LEGEND
G Gas Ø 1/2” - Ø 3/4”
(see cock supplied with the boiler)
F Boiler water supply Ø 1/2” (cold)
AE Electrical supply
M System delivery Ø 3/4”
R System return Ø 3/4”
GS Holding hooks Ø10 mm.
NOTE: Provide female water connections.
98
440
130,5
278
13,5
770
440
384 28
GS
28
MR
AE
GF
12 744,5
220
342 98

38
WATER CIRCUIT
LEGEND
A System delivery
B Gas
C Cold water inlet
D System return
1 Exchanger
2 Modulator coil
3 Heating sensor
4 Gas valve
5 Filling cock
6 Safety valve
7 No-water pressure switch
8 Circulator
9 Burner
10 Expansion tank
11 Fumes pressure switch
12 Fan
13 Automatic air bleed valve
14 Total safety thermostat
15 By-Pass (if any)
XILO T 20 N MS W TOP
1009DIS1360
D
C
B
A
4
265
15
7
8
13
14
9
10
11
12
1
3
Fume analysis points

39
INSTALLATION
To be carried out by qualified personnel.
The installation must be in compliance with the stipulations of the law regarding the evacuation of combustion
materials according to the REGULATIONS IN FORCE.
The gas fume evacuation must be effected with a pipe of a diameter not less than that required by the boiler
and it must be connected to a flue pipe suitable for the capacity of the installation.
For connection of appliances to smoke conduits:
a) they must be easy to dismantle;
b) they must be sealed and of a material able to resist the products of
combustion and their possible condensation;
c) they must not have regulation devices (gate valves). If such devices are
already in operation they must be eliminated;
d) the connection itself must not protrude inside the flue pipe but stop before the internal
face of the same.
GAS CONNECTION
Carry out the gas connection in accordance with the regulations in force.
The boiler must be connected to the installation with a rigid metal pipe or a flexible stainless steel pipe with
continuous wall of the approved type. The flexible corrugated metal pipes must be installed in such a way that
their length, in a state of maximum extension, is not greater than 2000 mm. The boilers are calibrated and
tested to function with G20 (Natural Gas) and G30/G31 (LPG), category II 2H3+, with rated pressures of 20
mbar, 28/30 mbar and 37 mbar respectively.
PUTTING THE BOILER INTO SERVICE
●Proceed with the clearing out of air.
●Check that there are no gas leaks (use a soapy solution or equivalent product).
SYSTEM FILLING
Open the feeding tap slowly until the system reaches a working pressure (indicated on the hydrometer) of 1.5
bar, then close it. Check that the automatic air bleed valve, on the circulator, has its cap loosened; run the
circulator repeatedly to eliminate any air in the circuit.
IGNITION
Open the gas tap and turn the selector switch to the desired position. The burner will ignite automatically.
Should the unit fail to ignite see if the lock-out indicator is on. If it is, turn the selector switch to RESET so that
the boiler repeats the ignition sequence. Then adjust heating and hot water temperature as desired via the
appropriate controls.
START-UP

40
FUME EVACUATION/AIR INTAKE
1 Concentric flue pipe, from the roof C32
2 Concentric flue pipe, from the terrace C32
3 Double flue pipe from separate flues C42
4 Concentric flue pipe, connected to concentric flues C42
5 Concentric flue pipe, from an external wall C12
6 Double flue pipe from the terrace C52
7 Double flue pipe from single flue C82
8 Double flue pipe C62
For positioning and for distances of draught terminals from windows, doors, etc. see regulations in force.
43
3
2
1
5
4
6
7
8
56
CONNECTION TO THE CHIMNEY - VERSION XILO T 20 N MS W TOP
The boiler is for combustion in a sealed chamber and does not require any special ventilation, it can also be
located in small rooms, lumber-rooms, laboratories. In addition, there are various possibilities for combustion fume
evacuation and external air intake; basically the boiler is designed for two types of fume evacuation/air intake :
●fume evacuation/air intake concentric pipes system,
●fume evacuation/air intake double pipes system.
In this way it is possible, by using suitable kits, to connect the boiler to concentric flues, ventilating flues,
separate flues, etc. Some possible solutions are indicated below.
FLUE EXHAUST CONNECTION

41
FLUE EXHAUST INSTALLATION
ATTENTION: Use only air intake/ fume evacuation kits produced by Lamborghini Caloreclima.
CONCENTRIC FLUE PIPE
Fit the concentric elbow pipe positioning it on the desired direction and insert on it the sealing gasket. Then
fit the appropriate diaphragm (see table below).
Fit the air intake and flue exhaust pipes, observing the distances indicated on the installation scheme. The flue
pipe should slope slightly outward.
DOUBLE FLUE PIPE
Maximum length of CONCENTRIC FLUE PIPE 3 m
Maximum length of DOUBLE FLUE PIPE
(Intake + Exhaust) 20 m
Installing an elbow to connect the boiler to the chimney will cause a
drop in pressure.
The values set out in the table below indicate the necessary modifi-
cations to the length of the linear pipes.
100 Max. 3000 220
Ø100
105
440
770
100 Max. 3000
160
330
SCARICO
Diaframma
aria
FLUE EXHAUST PIPE
Air diaphragm
1 m
0,6 m
0,5 m
0,3 m
ELBOW FITTED
AT 45°
ELBOW FITTED
AT 90°
TYPE OF INSTALLATION
CONCENTRIC FLUE PIPE
SEPARATE INTAKE/EXHAUST
** Air intake Ø 80
97
250
1009DIS1349
CONCENTRIC FLUE PIPE
Diaphr.
Ø 78 mm
DOUBLE FLUE PIPE
length m
Max. length
0,5 ÷ 1 m Over 1 m max. 3 m
Diaphr.
Ø 87 mm Diaphr. Ø 47 mm Diaphr. Ø 50 mm NO
0,5 ÷ 10 10 ÷ 20 20 ÷ 30

42
GAS PRESSURE ADJUSTMENTS WITH HONEYWELL VK 4105 VALVE
All boilers are tested and calibrated in the factory. At first ignition it is necessary to check and set up the boiler
to adapt it to the system characteristics. The gas pressure at the burner must be checked through the pressure
plug placed on the pipe coming out from the gas valve and by using a water column pressure gauge or a
micro-manometer. The values must be those indicated in the specific table. When all calibrations have been
completed, close and seal the pressure plug used. Calibration of the slow ignition is electronically done and
is adjustable (for optimising and for gas type conversion) by the trimmer RLA on the electronic board. The
necessary thermal output for the heating system can be regulated by acting on the trimmer R.MAX.
By removing the JP4 bridge, the waiting time for boiler restarting can be varied, after its stop when reaching
the temperature selected on the heating potentiometer. (bridge off: 2,5 minutes)
MODULATION MAXIMUM PRESSURE ADJUSTMENT
●remove the protecting cover G
●place the “function selector” on TEST position
●tighten (to increase) or untighten (to decrease) the adjustment bolt H
MINIMUM PRESSURE ADJUSTMENT
After the maximum pressure adjustment has been completed proceed with the following operations:
●disconnect the power wire (12 V) from the modulation coil
●tighten (to increase) or untighten (to decrease) the adjustment bolt I
●
connect again the modulation coil power wire (12 V) (“function selector” must always be on TEST position)
●replace the protecting cover G
Once adjustments have been effected, replace “function selector” on Summer or Winter.
JP4
JP1 JP3
JP5
RLA R max.
Adjustment trimmer RLA
Adjustment trimmer R. MAX
Note: “Function selector” places on “TEST” only for combustion test. This function stops gas pressure on
maximum output for 15 minutes.
For this calibration it is necessary to use a water column pressure gauge connected to the pressure
plug.
H
G
I
Burner pressure
intake

43
SWITCHING OFF
PROLONGED SWITCHING OFF
If the boiler should remain inactive at length close the gas cock and cut electrical power supply to the ap-
pliance.
TEMPORARY SWITCHING ON/OFF
Proceed in one of the following ways:
●use the room thermostat;
●use the adjustment potentiometers (on the instrument panel);
MAINTENANCE
NOTE: with a new boiler or after a long period of inactivity,
one can check for the locking of the circulating
pump. In this case it is necessary to unscrew the
front stopper and make the motor shaft rotate with
a screwdriver.
To ensure long-lasting product functionality and efficiency within the limits prescribed by the laws and standards
in force, the unit must undergo regular maintenance.
Frequency of inspection depends on the specific conditions of installation and use but it is advisable to have
the unit checked once a year by authorised Lamborghini Service personnel. Only properly qualified personnel
with specific knowledge in the field of safety, efficiency, environmental hygiene and combustion may carry out
work on the unit. To ensure proper maintenance it is also required that such personnel be fully updated on the
constructive and functional characteristics of the boiler.
Should work or maintenance be carried out on any structures situated near fume ducts and/or fume discharge
devices and their accessories always switch off the boiler and, when work is over, have its efficiency checked
by qualified personnel
IMPORTANT: before doing any cleaning or maintenance work on the unit switch off the electrical power supply
via the switch on the boiler itself. Shut off the gas supply by closing the tap on the boiler. The above stated,
work generally involves the following: