Ferroli ECONCEPT 100 Troubleshooting guide

INSTRUCTIONS FOR USE,
INSTALLATION
AND MAINTENANCE
HEAT GENERATOR RUNNING ON GAS,
PRE-MIXED WITH CONDENSATION
ECONCEPT 100

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3
• Carefully read the warnings in this instruction
booklet since they provide important
information on safe installation, use and
maintenance.
• This instruction booklet is an integral part of
the product and must be carefully kept by the
user for future reference.
• If the unit is sold or transferred to another
owner or if it is to be moved, always make sure
that the booklet accompanies the boiler so
that it can be consulted by the new owner and/
or installer.
• Installation and maintenance must be carried
out by professionally qualified personnel,
according to current regulations and the
manufacturer's instructions.
• Incorrect installation or poor maintenance can
cause damage or physical injury. The
manufacturer declines any responsibility for
damage caused by errors in installation and
use or by failure to follow the manufacturer's
instructions
• Before carrying out any cleaning or
maintenance operation, disconnect the device
from electrical power supply using the switch
and/or the special cutoff devices.
• In case the unit breaks down and/or functions
poorly, deactivate it, do not make any attempt
to repair it or directly intervene. Contact
professionally qualified personnel.
• Any repair/replacement of products must only
be carried out by qualified professional
personnel using exclusively genuine parts.
Failure to comply with the above could affect
the safety of the unit.
• Yearly maintenance carried out by qualified
personnel is essential for guaranteeing good
operation of the unit.
• This unit must only be used for the purpose for
which it was designed. Any other use is
consideredimproperandthereforehazardous.
• Afterremovingthepacking, check the integrity
of the contents.
• Packing materials must not be left within the
reach of children as they are potentially
hazardous.
• In case of doubt do not use the unit, and
contact the supplier.
This symbol indicates "Caution" and is placed next to all safety warnings. Strictly follow
these instructions in order to avoid danger and damage to persons, animals and things.
This symbols calls attention to a note or important notice
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)
President and Legal Representative
Cav. del Lavoro
Dante Ferroli

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4
1. OPERATING INSTRUCTIONS .............................................................. 5
1.1 Introduction ................................................................................................. 5
1.2 Control panel ............................................................................................... 6
1.3 Cascade control unit (code 1KWMH18A) ................................................... 9
1.4 Turning on and off ....................................................................................... 9
1.5 Anomalies .................................................................................................... 9
2. INSTALLATION .................................................................................. 10
2.1 General Instructions .................................................................................. 10
2.2 Connection in cascade............................................................................... 10
2.3 Place of installation .................................................................................... 11
2.4 Plumbing and gas connections.................................................................. 11
2.5 Electrical connections ................................................................................ 14
2.6 Flue connection ......................................................................................... 16
2.7 Condensate outlet ..................................................................................... 16
3. SERVICE AND MAINTENANCE ........................................................ 17
3.1 Adjustments ............................................................................................... 17
3.2 System start-up.......................................................................................... 18
3.3 Maintenance .............................................................................................. 20
3.4 Troubleshooting ......................................................................................... 21
4 TECHNICAL CHARACTERISTICS AND DATA ..................................... 23
4.1 Dimensions and connections ..................................................................... 23
4.2 General view and main components ......................................................... 24
4.3 Technical data table ................................................................................... 25
4.4 Diagram of losses of load / head of circulator .......................................... 26
4.5 Wiring diagram .......................................................................................... 27

ECONCEPT 100
5
1. OPERATING INSTRUCTIONS
1.1 Introduction
Dear Customer,
Thank you for choosing Econcept 100, a FERROLI heat generator of the latest generation featuring
advanced design and cutting-edge technology.
Econcept 100 is a high-efficiency modular heat generator for condensation pre-mixed heating with very low
emissions, running on natural gas or LPG.
Each Econcept 100 module is equipped with a twin aluminium laminar exchanger and a twin ceramic pre-
mixed burner contained in an upright cabinet made of AISI 316 stainless steel.
Each boiler shell (exchanger + burner) is governed by its own microprocessor control system with self-
diagnosis, capable of working independently.
The user interface is easy to use with a keyboard and display, making it possible to know the unit’s operating
status at any time. The operating parameters and historical data are stored internally and can be retrieved
via the interface with a Personal Computer to make Service operations easier.
The plumbing circuits of the exchangers, each one equipped with its own local circulation pump, run into
system delivery and return manifolds in the module.
A cascade control unit, available on request, provides effective and economical control of the two internal
boiler shells or a number of Econcept 100 modules connected in cascade.
Boiler shell
1
Boiler shell
2
Cascade control
unit (on request)
Boiler shell 1 and
2 control panel
Fig. 1

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OFFON
OFFON
OFF ON
Display D1
boiler 1
Display D2/D3
boiler 1
Boiler 1
ignition button
(switches the top boiler shell on)
Main ignition
button
(switches the entire
module On/Off)
Display D1
boiler 2
Display D2/D3
boiler 2
Boiler 2
ignition button
(switches the bottom boiler shell on)
1.2 Control panel
The control panel permits displaying the operating status, the setting of the operating parameters of the two
exchanger + burner shells inside the module.
At the control panel level, operating adjustment and display are entirely independent for the two internal
boiler shells.
Fig. 2
MODE key - to scroll through the parameters.
RESET key - to reset generator operation after a shutdown.
EDIT keys - to edit the settings.
CONFIRM key - to enable the setting made.
MODE Display - shows the generator operating mode or the selected parameter.
DATA Display - shows the value of the parameter
Key functions
Display information

ECONCEPT 100
7
Operating mode
Standby
Heating
Standby after heating op.
Display “D1” Display “D2/D3”
System delivery temperature
System delivery temperature
System delivery temperature
Summer/Winter selection (00 = Summer • 11 = Winter)
DO NOT CHANGE THIS PARAMETER*
System delivery temperature display and setting
Not used
System return temperature display
Outside temperature display
Not used
Not used
Not used
Boiler power display
Compensation curve display and setting
Not used
DISPLAY D1 DISPLAY D2 - D3
Operating information on display
During operation, without pressing any keys, the display shows the unit’s status:
Accessing the operational menu
Pressing the “ - mode” key a first time takes you to the operational menu. Press the “ - mode” again
to display the following parameters and information in sequence:
*Important: For the generator to work correctly, this parameter must be set on “00”.

ECONCEPT 100
8
20
30
40
50
60
70
80
90
20 10 0 -10 -20
Outside temperature °C
System delivery temperature °C
1
2
3
4
5
6
7
8
9
10
Adjustments
Setting the system temperature
To set the system delivery temperature on the single boiler shell, access the operational menu and press the
key to display parameter 1 – system delivery temperature. On pressing one of the keys , the display
starts blinking and the delivery temperature setpoint is displayed. Use the keys to set the required
value. To activate the new setting, press . To cancel, do not press the key and press .
Summer/Winter selection
For the Summer/Winter selection, go to the operational menu and press to display parameter “0.”.
In relation to parameter “0.”, pressing one of the keys displays the Summer/Winter selection (the
parameter “0.” blinks); by using these same keys you can select Summer operation (set 00) or Winter operation
(set 11). To activate the new setting, press and to exit without activating the selection, press .
In “Summer” mode (00) heating is off. The antifreeze function stays on.
Sliding Temperature
When the optional outside sensor is installed the generator adjustment system works with “Sliding
Temperature”. In this mode, the temperature of the heating system is governed according to the weather
conditions outside so as to ensure a high degree of comfort and energy savings throughout the year. In
particular, as the outside temperature increases the system delivery temperature decreases according to a
specific “compensation curve.“
With the Sliding Temperature adjustment, the temperature set in parameter 1 of the operational menu
becomes the maximum system delivery temperature. It is recommended to set a maximum value to permit
system adjustment throughout its useful working range.
The generator must be regulated at the time of installation by qualified personnel. Any adjustments can
anyhow be made by the user to improve comfort: the compensation curve can be modified from the
operational menu with the key and scrolling through the menu again with the key to parameter 9.
The set compensation curve is displayed (cfr. graph beneath). On pressing one of the keys, the display
starts blinking and it is possible again with the to set the required value. To activate the new curve,
press . To cancel, do not press the key and press .
If the room temperature is lower than as required, it is recommended to set a curve of a higher degree and
vice versa. Proceed by increasing or decreasing in steps of one and check the outcome in the room.
Compensation curves

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1.4 Turning on and off
Ignition
Check that the external system shut-off valves are open. Open the gas cock upstream from the generators,
turn the main switch ON and press the ignition keys on the control panel. The boiler will run a self-test cycle
of approximately one minute, after which it is ready for operation. The burner switches on and off entirely
automatically depending on the system heat requirements.
Turning off
If the unit is not to be used for a long time, close the gas cock upstream from the generators and disconnect
the electrical power. In this case, the boiler antifreeze protection, which switches on the burner for system
temperatures below 5°C, is also turned off.
Dangers of freezing
The best protection during extremely cold periods is to keep the boiler and services working so that
the entire system is involved. Alternatively, add antifreeze fluid to the system water, in the proportion
directed by the supplier according to the presumed minimum ambient temperature.
1.5 Anomalies
In the event of operating problems or trouble, the display blinks 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 generator’s normal working range.
Faults marked with the letter “A” cause a generator shutdown that the user can reset. To restore operation,
you need to press the (reset) key.
If the problem remains, or for any other trouble, refer to the “troubleshooting” section in this manual for
further details and, if necessary, call in Qualified Personnel or the assistance centre.
In case the unit breaks down and/or functions poorly, deactivate it, do not make any attempt to repair
it or directly intervene. Contact authorized and professionally qualified personnel.
1.3 Cascade control unit (code 1KWMH18A)
A cascade control unit, available on request, provides advanced control of the operation of the two internal
boiler shells.
One control unit can handle up to 5 internal boiler shells.
Control unit/module combinations are given in the following table.
For the connection and operating instructions, refer to the manual supplied with the control unit.
61
2
3
4
5
6
HG/SQ-2
Honeywell
ABS78 9101112131415161718
LNLLLN12
3456
-- COMMON --
JP7
1
2
3
4
5
1
1
2
2
2
N°of Econcept
100 modules
N°of cascade
control units
Fig. 3

ECONCEPT 100
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Safety
elements
GAS
DELIVERY
RETURN
Generatorsconnectedinthiswaycanbeconsideredasasingle“equivalent”heatgeneratorwithatotalcapacity
of N x 90.4 kW. It is necessary to meet all the requirements of current standards and regulations applicable to
this“equivalent”generatorwithatotal heating capacityofN x 90.4kW.In particular theplaceof installation, safety
devices and fume extraction system must be adequate for the total heating capacity N x 90.4 of the bank of
Econcept 100 units.
Please note that each Econcept 100 module is in actual fact a complete independent heat generator, equipped
with its own safety devices. In particular, each Econcept 100 module is equipped with a water pressure switch,
safetythermostatandelectronic limiting device. In the event of over-temperature,alackofwater or of circulation
in the unit, the protection devices cause the unit to switch off or shut down, preventing it from working.
The installation instructions given in the following paragraphs concern both single modules and cascade
connections.
Fig. 4
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 at atmospheric pressure and must be connected to a heating
system compatible with its performance, characteristics and heating capacity. Any other use is considered
improper.
INSTALLATION OF THE GENERATOR MUST ONLY BE PERFORMED BY QUALIFIED PERSONNEL,
IN ACCORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL, THE
PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF NATIONAL AND LOCAL STANDARDS,
AND THE RULES OF PROPER WORKMANSHIP.
Incorrect installation can cause damage or physical injury for which the manufacturer declines any
responsibility.
2.2 Connection in cascade
Econcept 100 is a heat generator designed to operate either singly or in cascade. If the heating capacity
required by the system exceeds 90.4 kW, two or more Econcept 100 generators can be connected in cascade
(max 5 heat generators), as shown by way of example in the figure.

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2.3 Place of installation
The generator can be installed directly outside or in a specific room with ventilation openings to the outside
as prescribed by current regulations. If there are several burners or suction units that can work together in
the same room, the ventilation openings must be sized for simultaneous
operation of all the units.
The place of installation must be free of flammable materials or objects,
corrosive gases, powders or volatile substances.
For positioning, leave sufficient room around the modules for normal
maintenance work.
In particular, check that the front door can open freely.
The air needed for combustion is drawn in through slits in the bottom
of the door. Make sure these air passages do not get obstructed in any
way.
2.4 Gas and water connections
Plumbing connections
Make the connections to the corresponding connections as directed below.
Make the generator connection in such a way that its internal pipes are free of
stress. For good operation and long life of the generator, the plumbing system
must be well proportioned and always complete with all those accessories that guarantee regular operation
and running.
In particular, make provision for all the protection and safety devices prescribed by current standards for the
modular generator assembly. They must be installed on the hot water circuit delivery piping, immediately
downstream from the last module, within a distance no greater than 0.5 metres, with no shut-off devices in
between. The unit is not supplied with an expansion tank; its connection must therefore be made by the
Installer.
In addition, a filter must be installed on the system return piping to prevent debris or sludge from
the system clogging and damaging the heat generators.
The filter must definitely be installed when replacing generators in existing systems.
The manufacturer shall not be held liable for any damage caused to the generator by failure to install
or inadequate installation of this filter.
Characteristics of the water system
In the presence of water harder than 25°Fr, we recommend the use of suitably conditioned water in order
to avoid possible scaling in the boiler, caused by hard water, or corrosion produced by aggressive water. It
should be remembered that, because of its low thermal conductivity, even scaling of just a few mm thick
causes significant overheating of the generator walls with consequent serious problems.
Water treatment is indispensable in the case of very large systems (containing large amounts of water) or with
frequent introduction of replenishing water in the system. If partial or total emptying of the system becomes
necessary under these conditions, it is advisable to refill it with treated water.
Gas connection
The gas must be connected to the relative connector with a rigid metal pipe.
The capacity of the gas meter must be sufficient for the simultaneous use of all equipment connected to it.
Make the gas connection of the generator in accordance with current regulations. The diameter of the gas
pipe leaving the generator does not determine the diameter of the pipe between the unit and the meter; it
must be chosen according to its length and loss of head.
AIR
AIR

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Connection side
1
2
3
1
2
34
1
2
3
1
2
34
Seals
Flanges with
joining section
Blind flanges
Blind flanges Flanges with
joining section
Connection side
Fig. 5
Fig. 6a
Plumbing connection using one generator with a water trap
Plumbing connection using two or more generators with a water trap
Key
1 - Gas inlet
2 - System delivery
3 - System return
4 - Condensate outlet
Connection instructions
Econcept 100 is equipped on the inside with 3 manifolds (gas, system delivery and return) and a condensate
outlet pipe that facilitate both cascade connections and connecting the single module to the system. The
manifolds are sized for connecting up to 5 modules in series. The cabinet contains a set of flanges, seals and
screws for the connection.
To connect a single module (Fig. 5)
• After deciding on which side of the Econcept 100 module to make the water and gas connections, connect
the flanges with the joining section, contained in the kit, on this side after appropriately welding them onto
the system pipes so they are airtight. Take care to fit the seals, contained in the kit, correctly.
• Connect a pipe Ø40 to the condensate outlet pipe to evacuate the condensate produced during operation
(see Fig. 7).
• Fit the blind flanges contained in the kit on the opposite side of the module, putting the seals in between.
To connect several modules in cascade (Fig. 6a).
• Connect the first module to the system and gas pipes, as described above, but without fitting the blind
flanges on the opposite side of the module to that of the connection.
• On this side, instead, connect the second module, taking care to align the connection flanges and the
condensate outlet pipe. Place the seals contained in the kit between the flanges of the two modules.
• Fit the bolts contained in the kit into the flanges from the inside of the first module, making them come
out of the flanges in the second module. Partially tighten the nuts onto the bolts from inside the second
module.
• Before tightening the nuts, check all the seals are correctly positioned and couple together the condensate
outlet pipes of the two modules (see Fig. 8).
• Tighten the nuts and repeat the connection operations for the following modules (max.5)
If using a water trap
• At the end, fit the blind flanges on the last module, putting the seals in between.
If using a direct pump
• Connect the delivery to the return on the last module (see Fig. 6b).

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2B
1
A
1
2 2
B
A
Fig. 7
Fig. 8
Condensate outlet connection using one generator
Condensate outlet connection using two or more generators
A - Place the pipe 1Ø40 (not supplied) on the side of the generator.
B - Slide the pipe 2towards the side of the arrow for at least 2-3 cm so as to insert it into the pipe 1.
A - Place the pipe 1Ø40 (not supplied) on the side of the generator.
B - Slide the pipe 2(of each generator) towards the side of the arrow for at least 2-3 cm so as to insert it into
the pipe 1.
Connection side
1
2
3
1
2
3
4
Seals
Flanges with
joining section
Delivery/return
connection
Plumbing connection using one or more generators with a direct pump
Fig. 6b

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2.5 Electrical Connections
Power supply
The generator should be connected to a single-phase power line, 230 Volt-50 Hz, interposing fuses of max.
3A between the boiler and the line, with a bipolar switch whose contacts have a minimum opening of at least
3 mm. It is always important to connect the boiler to a good earthing system.
When electrically connecting the boiler to a power system with phase and neutral, it is advisable to RESPECT
THE polarities (LINE: brown wire / NEUTRAL: blue wire / : yellow-green wire). Note: If changing the electric
power cable, use solely “HAR H05 VV-F” 3x0.75 mm2 cable with a maximum outside diameter of 8 mm.
Operation enabling signal
External sensor
Sequence adj. connection (OpenTherm)
Operation enabling signal
External sensor
Sequence adj. connection (OpenTherm)
OFFON
OFFON
OFF ON
Generator 1 Generator 2
123456789101112
L
N
230V
50Hz
Fig. 9

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Fig. 10
Positioning the external sensor
The external sensor should preferably 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.
In any case, the sensor must never be fitted near windows, doors, ventilation openings, flues or sources of
heat that could affect the reading.
Note: The maximum permissible length of the electric cable connecting the boiler - external sensor is
50 m. A common 2-wire cable can be used.
H
1/2H
1/2H
H
N
N W

ECONCEPT 100
16
1
2
3
4
5
150
200
250
300
350
N°of Econcept
100 modules
Ø
manifold/flue
2.6 Flue connection
• Manifold, ducts and flue must be suitably sized, designed and made in compliance with current
regulations. They must be made of suitable materials, i.e. resistant to heat and corrosion, smooth on the
inside and airtight. In particular, joints must be condensation-proof. In addition, make provision for
adequate condensate drainage points, connected via an air-trap to
prevent the condensation in the flues running into the generators.
• To connect several modules in cascade, connect the fume outlets (Ø 150)
of the single modules as shown in the figure, taking care to observe the
manifold and flue diameters given in the table alongside here. The single
flues must be coupled onto the manifold at an angle of approximately
30°to the vertical (Fig. 11).
• Air is drawn from the installation room, which must be equipped with
adequate ventilation in accordance with current laws and regulations.
Safety
elements
The manifold must slope towards the condensate
outlet at an angle of at least 3°.
Ø
150
30°
+3°
Fig. 11
2.7 Condensate outlet
The boiler is equipped with an internal air-trap to drain off the
condensate,connectedtoaninternal condensate outlet manifold
4 Fig. 12. Before starting up, open the cabinet and fill the air-
trap with approximately 0.5 l. of water.
0,5 lt.
4
Fig. 12

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B
A
Gas Nozzle
(G20) 6,70 mm
Category
2E
(G31) 4,75 mm3P
Fig. 13
3. SERVICE AND MAINTENANCE
3.1 Adjustments
All adjustment and conversion operations must be carried out by Qualified Personnel such as the personnel
of the Local After-Sales Technical Service.
Ferroli declines any responsibility for damage or physical injury caused by unqualified and unauthorized
persons tampering with the device.
Gas supply conversion
The unit can function with either Natural Gas or LPG and is factory-set for use with one of the two gases, as
clearly shown on the packing and on the unit’s dataplate. Whenever a different gas to that for which the unit
is preset has to be used, a conversion kit will be required, proceeding as follows:
1Unscrew the gas fittings Aon the air/gas mixers B.
2Change the nozzles in the mixers with the ones in the conversion kit.
3Refit the fittings Aand check the connections are airtight.
4Apply the sticker, contained in the conversion kit, near the dataplate.

ECONCEPT 100
18
Setting
70°C
Adjustable from:
30 a 90°C
Boiler parameter adjustment
Pressing the “mode” and keys simultaneously for more than 3 seconds takes you to the boiler
parameter menu.
On then pressing you can scroll through the parameters, and with the and v keys you can edit the
settings.
For the modification to become active you must press “confirm”.
Temperature adjustments
Pressing “Mode” takes you to the user menu (cfr. chap. 1 for a full description) where it is possible to
edit:
Par. “1” • System temperature
The generator is equipped with a safety device that temporarily stops operation if ∆t are too high.
3.2 System start-up
Commissioning must be performed by Qualified Personnel such as the staff of our Sales Organization and
your local After-Sales Technical Service.
The first ignition is free of charge and must be requested as directed on the sticker on the generator.
Checks to be made at first ignition, and after all maintenance operations that involved disconnecting from
the systems or work on safety devices or parts of the generator:

ECONCEPT 100
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Before igniting the generator:
• Open any on-off valves between the generator and the systems
• Check the airtightness of the gas system, proceeding with caution and using a soap and water solution
to detect any leaks in connections.
• Fill the system as directed above and make sure that all air contained in the generator and the system has
been vented by opening the air vent valve inside the unit and any vent valves on the system.
• Make sure there are no water leaks in the system, connections or generator.
• Make sure the electrical system is properly connected.
• Make sure that the unit is connected to a good earthing system.
• Check the unit is correctly connected to the condensate draining system and make sure the condensate
evacuation system works properly.
• Make sure that the pressure and gas flow values are those required for heating.
• Make sure there are no flammable liquids or materials in the immediate vicinity of the generator.
Turning on the generator:
• Open the gas cock ahead of the generator.
• Vent the air from the pipe ahead of the gas valve.
• Turn on the switch or insert the plug ahead of the generator.
• Turn the main switch and the two boiler shell switches ON.
• The generator turns on and runs a full self-test cycle of approximately one minute, checking the main parts
work properly. The display shows the following in sequence:
Software release
Parameter version
Operation in test mode - ( )
• If the cycle is correctly passed:
- If there is no call for heating, the display shows a lowercase “ o “ (standby operating mode) followed by
the temperature value of the delivery sensor. Then use the room thermostat or the remote control to
activate heating
- If there is a call for heating, the display passes from standby “ o “ to the heating phase “ c “ and the
generator starts working automatically, governed by its control and safety devices.
- If any faults are found in the self-test cycle or during ignition, the display will show the relevant error code
and the generator will shut down. Wait for approximately 15 seconds and press reset. The reset generator
will repeat the ignition cycle. If the generator fails to light after the second attempt, consult the
“Troubleshooting” paragraph.
Note: In the event of an electrical power failure while the generator is working, the burner will go out. When
power returns, the boiler will run the self-test cycle again, after which the burner will automatically
re-ignite (if there is still demand for heat).
Checks during operation
• Check the airtightness of the fuel circuit and water systems.
• Check the efficiency of the flue and air-fume ducts while the generator is working.
• Check that the water is circulating properly between the boiler and the systems.
• Make sure that the gas valve modulates correctly in both the heating and hot water production phases.
• Check the proper ignition of the generator by performing various tests, turning it on and off with the room
thermostat or remote control.
• Make sure that the fuel consumption indicated on the meter corresponds to that given in the technical data
table.
• Check the parameters are programmed correctly and perform any required customization (compensation
curve, power, temperatures, etc.).

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20
3.3 Maintenance
The following operations are strictly reserved for Qualified Personnel, such as the staff of our Sales
Organization and your local After-Sales Technical Service.
Seasonal inspection of the generator and flue
Have the following checks carried out at least once a year:
• The control and safety devices (gas valve, flow meter, thermostats, etc.) must function correctly.
• The fume ducts must be free of obstructions and leaks.
• The condensate evacuation system must be efficient with no leakage or obstructions.
• The gas and water systems must be airtight.
• The burner and exchanger must be clean. Follow the instructions in the next paragraph.
• The electrodes must be free of scale and properly positioned.
• The water pressure in the cold water system must be about 1 - 1.5 bar; otherwise, bring it to that value.
• The gas flow and pressure must correspond to that given in the respective tables.
• The circulating pumps must not be blocked.
Cleaning the generator and burner
The body and burner must not be cleaned with chemical products or wire brushes.
In addition, it is necessary to pay attention after performing all these operations to check and carry out all
the phases of ignition and thermostat operation, the gas valves and circulation pumps.
After these checks, make sure there are no gas leaks.
Shutting off the exchangers from the system
To cut the single exchanger off from the system and permit maintenance work, shut off first the return valve
“1” and then the three-way delivery valve “2”. In this way, the three-way valve “sets the exchanger in
communication with the atmosphere”, causing it to discharge into the manifold “4”.
4
1
2