Ferroli MAXIMA 35 C Troubleshooting guide

Appr. nr. B02.01 - CE 0063 B0 3924
wall-mounted gas fired,
pre-mix
condensing combination boiler
MAXIMA 35 C
cod. 3544452/3 - 05/2005
Seasonal Efficiency
(SEDBUK)
band A (90,9%)
G C N° 47-267-33
INSTRUCTIONS FOR USE, INSTALLATION AND MAINTENANCE

2
Maxima 35 C
IMPORTANT
Your "benchmark" Installation, Commissioning and Service Record Log Book is enclosed in the
last pages of this manual. “This record must be completed and left with the end user”.
Ferroli is a member of the Benchmark initiative and fully supports the aims of the programme.
Benchmark has been introduced to improve the standards of installation and commissioning of central
heating systems in the UK and to encourage the regular servicing of all central heating systems to
ensure safety and efficiency.
Please see installation and servicing guidelines.
• Read the warnings given in this manual thoroughly.
They provide important information for safe
installation, use and maintenance
• The instruction manual, by law must be left with
the end user.
• If the appliance is sold or transferred to another
owner or if the owner moves, leaving the appliance
behind, always ensure that the manual is kept
with the appliance for consultation by the new
owner and /or installer.
• Incorrect installation or poor maintenance absolves
the manufacturer from all liability for damage to
persons and property.
• Installation and maintenance must be carried out
in accordance with current legislation, according
to the manufacturer’s instructions and by qualified
corgi registered engineer.
• Before service or maintenance work is carried out
isolate the appliance from the mains electricity
supply.
• In the event of malfunction or faulty operation, iso-
late the appliance. Do not attempt to repair or carry
out any other operation on the appliance directly.
Contact Ferroli or a qualified engineer only.
• Repairs or the replacement of components must
be carried out exclusively by qualified personnel
using original spare parts only. Failure to adhere
to the above may compromise the safety of the
appliance.
• To guarantee efficient operation, the appliance
must be serviced once a year by a Corgi registered
engineer.
• The appliance may not be used for purposes other
than those for which it was explicitly designed.
• Incorrect installation and use or failure to follow the
instructions provided by the manufacturer absolve
the manufacturer from all liability for damage.
• After unpacking, check that the contents are correct
and undamaged.
• Keep packing out of reach of children as it could be
potentially hazardous.
• To clean external parts, use a damp cloth moistened
with soapy water if necessary. Avoid using abrasive
cleaning products and solvents.
This symbol indicates “Caution” and is placed next to all safety information.
Strictly follow these instructions in order to avoid danger and damage to
persons or property.
This symbols calls attention to a note or important information, please read
thourougly.
President and Legal Representative
Cav. del Lavoro
Dante Ferroli
•
•
•
•
Declaration of conformity
Manufacturer: FERROLI S.p.A.
Address: Via Ritonda 78/a 37047 San Bonifacio VR Italy
declares that this unit complies with the following EU directives:
Gas Appliance Directive 90/396
Efficiency Directive 92/42
Low Voltage Directive 73/23 (amended by 93/68)
Electromagnetic Compatibility Directive 89/336 (amended by 93/68)

3
Maxima 35 C
1. OPERATING INSTRUCTIONS..................................................................4
1.1 Introduction ............................................................................................................4
1.2 Control panel ..........................................................................................................5
1.3 Operationg instructions..........................................................................................7
1.4 Adjustments ............................................................................................................7
1.5 Maintenance............................................................................................................8
1.6 Faults.......................................................................................................................8
2. INSTALLATION .......................................................................................9
2.1 General Instructions................................................................................................9
2.2 Boiler location .......................................................................................................10
2.3 Boiler water connections ......................................................................................12
2.4 Connection to the gas system..............................................................................14
2.5 Electrical Connections ..........................................................................................14
2.6 Flue system ...........................................................................................................17
2.7 Condensate outlet connection .............................................................................23
3. SERVICE AND MAINTENANCE............................................................25
3.1 Adjustments ..........................................................................................................25
3.2 Initial start-up........................................................................................................25
3.3 Maintenance..........................................................................................................26
3.4 Troubleshooting....................................................................................................28
4 TECHNICAL CHARACTERISTICS AND DATA.........................................30
4.1 Dimensions and connections ................................................................................30
4.2 General view and main components ....................................................................31
4.3 Hydraulic diagram.................................................................................................32
4.4 Technical data table..............................................................................................33
4.5 Diagrams ...............................................................................................................34
4.6 Wiring diagram .....................................................................................................35
Benchmark................................................................................................36

4
Maxima 35 C
1. OPERATING INSTRUCTIONS
1.1 Introduction
Dear Customer,
Thank you for choosing Maxima 35 C, a FERROLI wall-mounted boiler of the latest generation,
featuring advanced design and cutting-edge technology.
Maxima 35 C is a high-efficiency condensing pre-mix appliance for heating and hot water production
with extremely low emissions, running on natural gas or LPG.
The boiler consists of an aluminium laminar heat exchanger providing effective condensation of the
water vapour contained in the flue gases, permitting extremely high efficiency.
Above the heat exchanger, in the boiler, there is a pre-mix burner, with a large ceramic surface,
equipped with electronic ignition and ionization flame control, which achieves extremely low emissions
while ensuring high reliability and long life operation.
The boiler is totally room sealed from the installation room: the air needed for combustion is
drawn from outside. The boiler also includes a modulating speed fan, modulating gas valve,
pumps, expansion vessel, flow meter, safety valve, flow sensor, temperature sensors, a safety
thermostat and a low pressure sensor.
Thanks to the twin microprocessor control and adjustment system with advanced self-diagnosis, unit
operation is for the most part automatic. The power for heating is automatically governed by the control
system according to the indoor and outdoor characteristics (with an optional outdoor sensor installed), the
characteristics of the building and of its location. The power for hot water is automatically and continually
governed to ensure a fast delivery and comfort under all operating conditions.
The user only has to set the temperature desired inside the home (by means of an optional room
thermostat or remote control, which is required under the building regulations 2002) or regulate the
temperature of the system, and set the desired outlet temperature for the hot water. The adjustment
and control system will provide optimum operation throughout the year.
The display continuously provides information on the unit’s operating status and it is easily possible
to obtain additional information on the sensor temperatures, set-points, etc. or configure them. Any
operating problems associated with the boiler or system is immediately signalled by the display
and, if possible, corrected automatically.

5
Maxima 35 C
1.2 Control panel
ON
OFF
1
47
6
15 13 16 12 1118 20
34
30
35
5
17
21
22
23 27
26
19
24
31
37
33
fig. 1
1 - Summer/Winter selection key
In Winter mode, both heating and hot water production are on; in Summer mode, hot water
production only (the heating display information will disappear in summer mode and the summer
display will illuminate - item 20).
4 - Heating temperature adjustment control
To increase the heating temperature, turn the knob clockwise; anticlockwise to decrease it.
The adjustment range goes from 20 to 90°C (see page 8).
5 - RESET key
The Reset key is used to reset boiler operation when it has shut down.
To reset the boiler, press Reset (5 - fig. 1).
The shutdown condition is indicated by the fault blinking and RESET being displayed.
6 - Power key
Turning the boiler on and off (on - green light on button pushed in).
7 - Hot water temperature adjustment control
Used to set the hot water temperature, turning the knob clockwise increases the temperature,
anticlockwise decreases it. The adjustment range goes from 40 to 65°C (see page 8).
11 - 12 Hot water temperature display
During operation, the display shows the temperature of the hot water leaving the boiler. When operating
knob “7” the display briefly shows the adjustment temperature being set.
17 - 18 Heating temperature display
During operation, the display shows the temperature of the heating water leaving the boiler. When
operating knob “4” the display briefly shows the adjustment temperature being set.

6
Maxima 35 C
13 - Fan symbol
This appears when there is a call for heating or hot water, and the fan is operating.
15 - Ignition symbol
The ignition symbol appears during the ignition phase.
16 - Flame symbol
Indicates the burner is on, the small rising bars to the right indicate the burner output 1=low, 5=high.
19 - REMOTE CONTROL symbol
This appears when the remote control is connected to the boiler.
20 - SUMMER symbol
This appears when the SUMMER mode is activated ( - 1 fig. 1).
21 - Heating pump symbol
Appears when the heating pump is operating.
22 - Frost protection
This appears when the boiler automatically comes on in frost protection, that is when the
temperature drops under 5°C.
The appliance stops when it reaches a temperature of 15°C.
23 - Symbol showing demand for heating
Appears when the appliance is in Winter operation, with a demand from external controls.
24 - Delay time symbol
Appears when the appliance is in Standby after Heating operation.
26 - Delay time symbol
Appears when the appliance is in Standby after Hot Water operation.
27 - Symbol showing demand for hot water
Appears when the appliance has a demand for hot water.
30 - System pressure display
Displays the heating system pressure.
31 - Hot water pump symbol
Display when the hot water pump is operating.
37 - Outside temperature compensation
Display outside temperature (in conjunction with optional outside sensor) and allows setting of compen-
sation curve parameters - see page 18)
34 - TEST symbol
Boiler operating in TEST mode (full power). To turn on TEST mode, hold down the “+” and “-” keys for
3 seconds. Press the “+” and “-” keys for another 3 seconds to exit. TEST operation turns off automa-
tically after 15 minutes.
35 - Fault and parameter display
Displays any fault code if they should occur (see page 29 troubleshooting).

7
Maxima 35 C
1.4 Adjustments
Room temperature adjustment (with optional room thermostat)
Using the room thermostat or remote control, set the temperature desired in the room. Controlled by the
room thermostat, the boiler lights and heats the system water to the set system setpoint temperature.
The burner shuts down when the desired temperature in the rooms is reached.
A room thermostat is a mandatory requirment (building regulations Doc “L” 2002).
C.H. temperature adjustment
To set the system flow temperature, use the C.H. control
knob. Turning it clockwise increases the temperature,
turning it anticlockwise decreases it.
When adjusting the control knob the display
will flash for 5 seconds and display the set point
temperature. It will then revert to showing actual
temperature.
Domestic hot water temperature adjustment
To set the hot water temperature, use the D.H.W. control
knob. Turning it clockwise increases the temperature,
turning it anticlockwise decreases it.
When adjusting the control knob the display
will flash for 5 seconds and display the set point
temperature. It will then revert to showing actual
temperature.
1.3 Operationg instructions
Ignition
• Open the gas isolation valve upstream of the boiler.
• Purge the air from the pipe upstream of the gas valve.
• Ensure power is on to appliance.
• Press the ON/OFF key in to turn on boiler (see fig. 1).
• The boiler is now ready to function automatically whenever hot water is drawn or the clock and
room thermostat calls for heating.
Turning off
Press the ON/OFF key (see fig. 1).
When the boiler is turned off with this button, the P.C.B. is no longer powered and the frost
protection will be disable.
Close the gas cock upstream of the boiler and disconnect the electrical power supply.
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the boiler, the tap water and the system water.

8
Maxima 35 C
Summer/Winter selection
To select either mode, simply press the key (1 - fig. 1).
On selecting Summer mode, the display shows .
On selecting Summer mode, the frost protection system stays on. The symbol is shown on the
display should the frost protection system come on.
1.5 Maintenance
It is strongly recommended to carry out annual maintenance on the boiler and the heating system.
Please refer to the “maintenance” section in this manual.
The casing, the control panel and the aesthetic parts of the boiler can be cleaned using a soft
and damp cloth.
Do not use abrasives or solvents.
1.6 Faults
In the unlikely event of an operating problem or component failure, the display flashes and a
fault identification code appears.
Faults marked with the letter “F” cause temporary shutdowns that are automatically reset as soon as
the value comes back within the boiler’s normal working range.
If together with the fault the display also shows RESET, the user must reset boiler operation by pressing
the key (5 - fig. 1). The ignition cycle will thus be repeated.
If the problem remains after two attempts at resetting, contact the Ferroli Service Centre.
For other faults, refer to section 3.4 “Troubleshooting.”
Before calling the Ferroli service centre, check that the problem is not due to an installation error
or a problem with the gas/electricity or low water pressure in the system.

9
Maxima 35 C
2. INSTALLATION
2.1 General Instructions
This device must only be used for the purpose for which it is specially designed. This unit is
designed to heat water to a temperature below boiling point and must be connected to a hea-
ting system and/or a water supply system for domestic use, compatible with its performance,
characteristics and its heating capacity. Any other use is considered improper.
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL, IN ACCORDANCE
WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE PROVISIONS OF CURRENT
LAW, THE RECOMENDATION OF BS STANDARDS, ANY LOCAL REGULATIONS AND THE RULES
OF COMPEDENT WORKMANSHIP.
Incorrect installation can cause damage or physical injury for which the manufacturer declines
any responsibility.
This appliance must be installed strictly in accordance with these instructions
and regulations:
The Gas Safety Regulations (Installations & Use).
The Local Building Regulations.
The Building Regulations (Part L).
The Buildings Standards (Scotland - Consolidated) Regulations.
British Standards Codes of Practice:
B.S. 5440 Part 1 Flues
B.S. 5440 Part 2 Air supply
B.S. 5449 FORCED CIRCULATION HOT WATER SYSTEMS
B.S. 6798 INSTALLATION OF GAS FIRED HOT WATER BOILERS
B.S. 6891 GAS INSTALLATIONS
B.S. 7671 IEE WIRING REGULATIONS
B.S. 4814 SPECIFICATION FOR EXPANSION VESSELS
B.S. 5482 INSTALLATION OF LPG
B.S. 7593 TREATMENT OF WATER IN DOMESTIC HOT WATER CENTRAL HEATING SYSTEMS
B.S. 5546 INSTALLATION OF HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
Model Water Bye Laws
B.S. 5955-8 PLASTIC PIPEWORK INSTALLATION
For Northern Ireland the rules in force apply

10
Maxima 35 C
Minimum
A
B
D
5 cm
20 cm
60 cm
(via an openable panel)
C40 cm
Table 1
fig. 2
A A
B
D
C
2.2 Boiler location
The unit’s combustion circuit is sealed off from the installation room. The installation room must be
sufficiently well ventilated to prevent any dangerous conditions from forming in the event of even slight
gas leakage. This safety standard is required by the EEC Directive no. 90/396 for all gas units, including
those with a so-called sealed chamber.
Therefore the place of installation must be free of dust, flammable materials or objects or corrosive
gases. The room must be dry and not subject to freezing.
The boiler is design to be installed on a solid wall. The wall fixing must ensure a stable and effective
support for the appliance, using the bracket and fixings supplied.
If the unit is enclosed in cupboard or mounted alongside, there must be space for normal maintenance
work. Fig. 2 and tab. 1 give the minimum clearances to leave around the unit.

11
Maxima 35 C
Make Up Water
Provision must be made for replacing water lost from the sealed system. Reference should be made
to BS6798, for methods of filling and making up sealed systems. There must be no direct connection
between the boiler's central heating system and the mains water supply. The use of mains water to
charge and pressurise the system directly, is conditional upon the Local Water Byelaws. Again any
such connection must be disconnected after use. The supplied temporary filling loop is shown in fig.
4. Ensure the filling point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and
certain water undertakings will not accept their use above ground.
Ensure all pipework is adequately supported
NOTE: An automatic bypass must
be fitted as far as possible from the
boiler if thermostatic radiator valves
are fitted thoughout.
Fig. 3
Gas
Hot water
Additional expansion
vessel C.H. (if required)
Filling
point C.H.
Automatic
Bypass
Key
1. Filling point C.H.
2. Temporary connection
3. Cold water supply
4. Double check valve
Fig. 4
3
2
1
4

12
Maxima 35 C
2.3 Boiler water connections
The heating capacity of the unit should be previously established by calculating the building’s heat
requirement according to current regulations. For good operation and long life of the boiler, the plumbing
system must be well proportioned and always complete with all those accessories that guarantee regular
operation and running, room thermostat, trv’s and automatic bypass.
If the delivery and return pipes follow a path where air pockets could form in certain places, it is esential
to install vent valves at these points. Also, install a type “A” drain cock device at the lowest point in
the system to allow its complete draining.
The temperature differential between the flow manifold and the return to the boiler should
not exceed 20° C.
A minimum flow of 6 litres/min is requied through the heat exchanger, it is therefore essential to fit a
automatic bypass a min of 3 meters away from the appliance, calobrated on site.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully flush all the pipes of the heating
system to remove residues or impurities that could affect
the unit’s good working (BS 7593 Building regs Doc L).
Make the connections to the appliance as shown in fig. 5.
Key
1 System flow (22 mm with isolation valve fitted)
2 DHW outlet (15 mm with isolation valve fitted)
3 Gas inlet (22 mm with isolation valve fitted)
4 Cold main inlet (15 mm with isolation valve fitted)
5 System return - 22 mm with isolation valve fitted (c/w filter)
6 System drain
7 Condense outlet
It is essential to install the isolation valves supplied between the boiler and heating system, allowing
the boiler to be isolated from the system if necessary.
The safety valve outlet must be connected to a 15 m pipe to allow system water out onto the
ground in the event of over-pressure in the heating circuit. If this is not done, and the drain valve
trips and floods the room, the boiler manufacturer is not to be held responsible. The outlet
should face back against the outer brickwork or building face to prevent harm or injury from hot
water discharging in the evet of an over-pressuried system.
Make the boiler connection in such a way that its internal pipes are free of stress. If a check valve is
installed on the tap water circuit (where applicable), it is necessary to mount a safety valve between
the boiler and this circuit (check valve minimum 3 meters from boiler).
fig. 5
1 2 3 5
6
240240
143
105,5
43
240 240
143
60
208
200
190
138 138 53
190
7
288
4

13
Maxima 35 C
The connecting kits shown in fig. 6 are supplied as standard.
Key
A=Nut
B = Compression olive
D=3/4” seal (green)
E = 1/2” seal (green)
F = 1/2” gas seal (blue)
G = Filter
H=Cap
Flow isolation valve
Hot water connection
Gas isolation valve
Cold water isolation valve
Return isolation valve
Ø22
Ø22
Ø22
Ø15
Ø15
A
A
A
A
AB
B
B
B
B
D
D
E
E
F
GH
fig. 6
Water treatment
When treatment is used ferroli limited only recommend the use of proprietary Brand, such as Fernox
or Sentinel water treatment products, which must be used in accordance with the manufactures
instructions. for further information contact:
Feronx Manufacturing Co. LTD. Sentinel Division
Tandern house, Marlowe Way Betz Dearborn LTD
Croydon, surrey, CRO 4YS Widnes, Cheshire WA8 8ND
Tel: [phone] Tel: [phone]
Note - When the boiler is installed with an existing or new system any unsuitable additives or system debris
must be removed by thorough cleansing. All systems should be cleansed according to B.S. 7593.
Note - In hard water areas treatment to prevent lime scale may be necessary.
Note - It is important that the correct concentration of the water treatment product is maintained in
accordance with the manufacturers instructions.

14
Maxima 35 C
2.4 Connection to the gas system
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to
establish the availability of an adequate supply of gas.
An existing service pipe must not be used whitout prior consultation with the local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers
Contractor.
Installation pipes should be fitted in accordance with BS6891.
Appliance inlet working pressure must be 20 mbar MINIMUM, for NG and 37 mbar minimum for pro-
pane.
Do not use pipes of a smaller size than the combination boiler inlet gas isolation valve (22 mm).
The complete installation must be tested for gas soundness and purged as described in BS6891.
All pipework must be adquately supported. An isolating gas valve is provided and should be fitted
on the boiler gas inlet. Please wait 10 minutes when ligthing from cold before checking the gas
rate. Gas pressures should be checked after the boiler has operated for 10 minutes to ensure
thermal equilibrium.
The appliance has no facility to check burner pressures, a combuston test should be carried out instead,
see page 28 (combuston analyser testing).
The connecting kits shown in fig. 6 are supplied as standard.
2.5 Electrical Connections
The unit must be installed in conformity with current national and local regulations.
Connection to the electrical grid
The boiler must be connected to a single-phase, 230 Volt-50 Hz electric line.
The unit’s electrical safety is only guaranteed when correctly connected to an efficient earthing
system executed according to current safety standards. Have the efficiency and suitability of
the earthing system checked by professionally qualified personnel. The manufacturer is not
responsible for any damage caused by failure to earth the system. Also make sure that the
electrical system is adequate for the maximum power absorbed by the unit, as specified on
the boiler dataplate, in particular ensuring that the section of the system’s cables is suitable
for the power absorbed by the unit.
The boiler is prewired and provided with a cable for connection to the electricity line. The connections
to the supply must be made with a permanent connection and equipped with a double pole switch
whose contacts have a minimum opening of at least 3 mm, and fused at max. 3A between the boiler
and the line. It is important to respect the polarities (LIVE: brown wire / NEUTRAL: blue wire / EARTH:
yellow-green wire) in making connections to the electrical supply.
The user must never change the unit’s power cable. If the cable gets damaged, switch off the
unit and have it changed solely by professionally qualified personnel. If changing the electric
power cable, use solely “HAR H05 VV-F” 3x0.75 mm2cable with a maximum outside diameter
of 8 mm.

15
Maxima 35 C
1
2
3
2
4
Room thermostat
CAUTION: THE ROOM THERMOSTAT MUST HAVE VOLTAGE FREE CONTACTS. CONNECTING
230 V. TO THE TERMINALS OF THE TIME CLOCK AND ROOM THERMOSTAT WILL IRREPARABLY
DAMAGE THE P.C.B.
When connecting a room thermostat with a daily or weekly program, or a timer switch, do not
take the power supply for these devices from their cut-out contacts. Their power supply must
be taken with a direct connection to the mains or with batteries, depending on the type of
device (isolation to mains fed clocks via a 3amp fused spur).
A
fig. 7
Terminal board wiring diagram
D.H.W. exclusion
switch connections
(optional)
External sensor
(optional)
Remote
time control
(optional)
Time control and
room thermostat connections
Access to the electrical terminal board
Follow the instructions given in fig. 7 to access the electrical connection terminal board
(A fig. 7). The layout of the terminals for the various connections is given in the wiring diagram in the
Technical Data chapter.

16
Maxima 35 C
H
1/2H
1/2H
H
N
N W
Fig. 8b
Fig. 8a
External sensor (optional)
Connect the sensor to its respective terminals 8 and 9 in appliance terminal block. The maximum per-
missible length of the electric cable connecting the boiler - external sensor is 50 m. A common 2-wire
cable can be used.
The external sensor must be installed on the North, North-West wall or on the wall with most of the
main living room. The sensor must never be exposed to early morning sunshine and in general, as far as
possible, it must not be hit directly by the sun’s rays; if necessary, it should be protected (fig. 8b).
In any case, the sensor must never be fitted near windows, doors, ventilation openings, flues or sources
of heat that could affect the reading (fig. 8a).

17
Maxima 35 C
2.6 Flue system
The unit is “type C” with a sealed chamber and forced draught, the air inlet and flue outlet
must be connected to one of the following flue systems. With the aid of the tables and methods
of calculation indicated, before commencing installation, it is first necessary to check that the
flue system does not exceed the maximum permissible length. The current standards and local
regulations must be observed.
It should be notes that only Ferroli flue system and accessories should be used on this appliance,
as per BS 5440 2000 and C.E. test certification.
Outside temperature compensation
When the (optional) external sensor kit is fitted to the appliance, the display will show outside
temperature in bottom right hand side.
By pressing the “ MODE” key once, the maximum boiler flow temperature curve can be set
(option of between 0 to 10)
1 = Maximum flow temperature of appliance 30 °C
10 = Maximum flow temperature of appliance 85 °C
(0 = O.T.C. = OFF)
By pressing the “MODE” key second time, the curve start point is displayed (default 30 °C).
To alter the above use the +/- key’s a recommended start point of between 20 to 30 °C and flow temp
of 85 °C is usually required in the U.K. (curve 9 or 10).
In O.T.C. mode the temperature of the heating system is controlled according to the external climate
conditions, this will guarantee a high degree of comfort and energy saving all year round.
When the external temperature falls, the CH flow temp is increased according to the compensation curve
set up (see chart below) correct of the outside sensor is important - see fig. 8a and 8b.
20
30
40
50
60
70
80
90
20 10 0 -10 -20
Outside temperature °C
Maximum boiler
flow temp C°
1
2
3
4
5
6
7
8
9
10

18
Maxima 35 C
* = between
10 and 60 mm
* = between
10 and 60 mm
240 240
Install level
50*115
95
80
30 50*
30
95
80
80
S 50*
P
115
L
DS
P
125
S
30
95
DS50*
L
30
95
240 240
180
240240
180
Drill the wall 10÷20 mm
more than the pipe diameter
Install level
Install level
Install level
Drill the wall 10÷20 mm
more than the pipe diameter
Standard 1KWMA53A
Flue kit
Connection with concentric flue system
The unit can be connected to a concentric air/flue duct with a wall or rooftop outlet as shown on the
following drawings. Numerous accessories are available on request to meet the various installation
requirements. Please refer to our “flue manual” or the price list.
Standard concentric flue installation
Side view
View from above
fig. 9a
Side Outlet
fig. 9b
Front view
View from above
P = S + 165 mm
Rear Outlet
L = S + D + 175 mm
Horizontal flue installation
1. Define the position for installing the unit.
2. If using standard flue (1KWMA53A) this must be installed level, for non-standard flue lenghts
over im a fall of 3 mm per metre should be incorporated.
3. Make a hole of diameter 10 - 20 mm greater than the nominal diameter of the concentric
pipe used.

19
Maxima 35 C
Vertical Outlet
fig. 9c
The total length in equivalent metres of the
concentric flue must not exceed the maximum
lengths stated in the following table, note that
each bend gives rise to the stated reduction.
For example, a duct = 60/100 composed of 1
bend of 90° +1 horizontal metre + 2 bends of
45° + 1 horizontal metre has a total equivalent
length of 4 metres. Angled roof tile
1KWMA82U
1KWMA56U
240 240
950
50
1KWMA71W
max. 6 metres 60/100 max. 12 metres 80/125
Roof end piece
1KWMA83U
68
95050
50 950
50
1000 125
10
Reduction factors for bends
Concentric bend at 90°- Ø 60/100 mm
Concentric bend at 45°- Ø 60/100 mm
Concentric bend at 90°- Ø 80/125 mm
Concentric bend at 45°- Ø 80/125 mm
1m
0.5 m
0.5 m
0.25 m
Table 2b
Maximum permissible
duct length (Horizontal)
Ø mm
60/100
5 m 12 m
Ø mm
80/125
Table 2a
Maximum permissible
duct length (vertical) 6 m 12 m
4. If necessary, cut the end pipe to size, ensuring that the external pipe protrudes from the wall by
between 10 and 60 mm (Fig. 9a and 9b). Remove the cutting burrs.
5. Connect the flue to the boiler, positioning the seals correctly. Seal the flue into the wall with silicone
or sand + cement and cover with wall seals provided.
Flue seals should be lubricated with a silicone type grease to prevent damage (grease
not supplied)

20
Maxima 35 C
1
3
4
2
1KWMA84U
Ref.
1
2
3
4
N°Pieces
16
16
1
1
Vertical flue pipe Ø80
Vertical air pipe Ø80
Vertical flue terminal
Two pipe adaption kit (1KWMR54A)
Description Equivalent
loss
25,6 m
16,0 m
12,0 m
0,0 m
53,6 m
Total
Table 3
fig. 10
fig. 11
Connection with 80 mm pipe system
The unit can be connected to a system of
separate air/flue pipes for a wall or rooftop
outlet as shown on the fig. 10 - 11. Numerous
accessories are available on request to meet
the various installation requirements.
Please refer to the flue manual catalogue or the
price list for additional components.
To check you do not exceed the maximum
permissible flue length, it is necessary to make
a simple calculation before installation:
1. For each component, tables 4 - 5 provide an
“equivalent loss in metres”, depending on
the position of installation of the component
(with air intake or flue extraction, vertical
or horizontal).
The loss is called “equivalent length” since it
is compared to the loss of one metre of flue
(defined as equal to 1). For example, a bend
at 90° of Ø80 in flue run has an equivalent loss
of 2.5 linear metres, i.e. it has a loss equal to
that of 2.5 metres of flue length.
2. After completely designing the layout of
the system, add up the losses in equivalent
metres, depending on the installation posi-
tion, of all the components and accessories
in the system.
3. Check that the total calculated loss is less
than or equal to 55 equivalent metres, i.e.
the maximum permissible for this model
of boiler.
For complete flue options please con-
tact FERROLI or check our comprensive
flue manual.
2
Ø80
AIR
Ø80
FUMES
Remove
the closing
cap
1
180
367
120 120 120120
80 84 80
Two pipe adaption
kit cod. 1KWMR54A