Ferroli RENDIMAX N EL Operating, Installation And Maintenance Instructions
Appr. Nr. A 9504 A • 0085 AQ 0766
RENDIMAX N EL
gas-fi red cast iron boiler for central heating
with elec tron ic ignition and fl ame control
OPERATING, IN STAL LA TION AND MAINTENANCE INSTRUCTIONS
cod. 3543742/3 - 05/2005
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Warning
• Read the warnings given in this manual thor ough ly. They provide important information for
safe installation, use and maintenance
• Keep the manual carefully for future con sul ta tion.
• The instruction manual is an integral and es sen tial part of the product and must be kept
by the user.
• If the appliance is sold or transferred to another
owner or if the owner moves, leaving the ap pli ance 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
ab solves the manufacturer from all liability for
damage to people or things.
• Installation and maintenance must be carried
out i conformity with current legislation, ac cord ing to the manufacturer’s instructions and
by qualified personnel.
• Before cleaning or maintenance, disconnect the
appliance from the mains via the switch on the
appliance or a suitable isolating device.
• In the event of malfunction or faulty operation,
deactivate the appliance. Do not attempt to
repair or carry out any other operation on the
appliance directly. Contact qualified personnel
only.
• Repairs or the replacement of components must
be carried out exclusively by qualified personnel using original spare parts only. Fail ure to
respect the above my compromise the safety
of the appliance.
• To guarantee efficient operation, the appliance
must be serviced once a year by an authorised
service centre.
• The appliance may not be used for purposes
other than those for which it was explicitly designed. Any other use is considered im prop er
and therefore dangerous.
• 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
whole and undamaged.
• Keep packing out of reach of children as it is
potentially hazardous.
• To clean external parts, use a damp cloth mois tened with soapy water if necessary. Avoid using
abrasive cleaning products and solvents.
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INDEX
OPERATING INSTRUCTIONS
1. Description of the boiler....................................................................................................................... 5
2. Main components ................................................................................................................................. 6
3. Ignition and shut-down......................................................................................................................... 7
4. Checks and maintenance...................................................................................................................... 8
INSTALLATION AND MAINTENANCE INSTRUCTIONS
5. Description of the boiler....................................................................................................................... 9
6. Main components ............................................................................................................................... 10
7. Technical specifications ...................................................................................................................... 11
8. Installation and safety devices............................................................................................................ 16
9. Electrical connections ......................................................................................................................... 18
10. Set-up................................................................................................................................................ 20
11. Settings............................................................................................................................................. 21
12. Gas conversion ................................................................................................................................. 23
13. Checks and maintenance.................................................................................................................. 24
14. Troubleshooting ............................................................................................................................... 26
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OPERATING INSTRUCTIONS
1. DESCRIPTION OF THE BOILER
1.01 Presentation of the boiler
The “Rendimax N EL” floor-standing boilers are gas-fired heat generators for central heating systems, with castiron bodies.
They are fitted with electronic ignition devices, automatic operation control (electronic flame control unit) and flue
gas sensors for verifying the correct discharge of the combustion gases.
The “Rendimax N EL PV” models are also pre-fitted with a variable-speed pump, expansion vessel and safety
valve.
The boilers are manufactured as standard for operation on natural gas (G20); For operation on LPG (G31), the
boilers must be converted on-site.
1.02 Instructions and requirements
The assembly, installation, conversion to other type of gas, commissioning and maintenance of the boiler must be
performed by specialist Companies, following all the relative technical requirements and standards. The boiler must
be installed according to the Standards and Laws in force, in particular regarding the size of the boiler room, the
discharge of flue gases, the water piping, the combustible gas supply system and the electrical system.
1.03 Checking and controlling the discharge of fl ue gases
The boiler is fitted with a flue gas thermostat, which cuts off the supply of gas to the burner in the event of incorrect functioning of the flue.
If the flue gas thermostat is activated, unscrew the protective cover on the control panel (3, Fig. 1) and press the
manual reset button; the boiler will then re-ignite.
If the flue gas thermostat is activated frequently, shut-down the boiler and call the Service Department.
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2. MAIN COMPONENTS
Fig. 1
Key
1 Boiler thermostat
2 Thermal pressure gauge
3 Flue gas thermostat cover
4 Gas valve
5 Cap (ready for mounting electronic control unit)
6 Drain valve
7 Electrode assembly
8 Control panel
9 Burner assembly
Front view of the boilers with control panel cover open
5 3 11 10
14
15
13
9
6
7
12
8
1
2
4
8
5 3 11 10 1312
10 Boiler switch
11 Reset button for electronic flame control unit
12 Electronic flame control unit
13 Safety thermostat with automatic reset
14 Heating system pump (PV version)
15 Cap on fitting for filling the system (PV version)
Mod. 16-23 PV Mod. 30-36
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3. IGNITION AND SHUT-DOWN
3.01 Ignition
Place the boiler thermostat in the “minimum temperature” position and power the appliance using the boiler
switch.
To ignite the burner assembly, proceed as follows:
• open the gas cock (fitted by the installer);
• adjust, using the knob, the boiler thermostat to the desired value (not less than 50°C.).
At this stage, the electronic control unit starts operating and will pilot, after a set waiting time, the gas valve and
the spark to the ignition electrode, which in turn will light the burner assembly. The ionisation electrode then checks
the presence of the flame in the burner assembly.
The boiler operates automatically, controlled by the boiler thermostat and/or any other control devices (room
thermostat, electronic temperature control unit, etc.).
Note If after having correctly performed the ignition operation, the burners do not light and the reset button light
on the electronic control unit (11 - Fig. 1) is on, wait around 10 seconds and then press the reset button. The
control unit is reset and will repeat the ignition cycle.
Note In the event of power failure, the burners will shut-down and will be automatically ignited once the power
returns.
3.02 Temporary shut-down
To temporarily shut-down the boiler, simply place the boiler switch (10- Fig. 1) in position ”0”.
3.03 Extended boiler shut-down
To shut the boiler down, proceed as follows:
• turn the knob of the boiler switch to position ”0”;
• close the gas cock upstream from the boiler;
• disconnect power to the appliance.
Note If the boiler is not used for an extended period in winter, to avoid damage from frost, special anti-freeze
should be added to the system, or else the system should be completely emptied (operation to be performed
only by qualified personnel).
3.04 Adjusting the central heating supply temperature
The supply temperature can be set using the boiler thermostat. The field of adjustment for the knob (1 - Fig. 1)
is 30-90 °C. It is not recommended to set the temperature below 50°C, to avoid dangerous condensation from
occurring.
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4. CHECKS AND MAINTENANCE
Attention
Current technical standards envisage periodic maintenance of the appliance, as well as analysis of the composition of the flue gas, to check correct combustion in the burner assembly. As a result, it is suggested that the user
stipulate a programmed maintenance contract with a specialised company to periodically carry out the operations
listed below.
4.01 General notes on maintenance
Have the correct operation and integrity of the flue checked periodically.
In the event of work or maintenance on structures located near the flues and/or flue gas discharge devices and
accessories, shut the appliance down and, upon completion of the work, have the condition of such parts checked
by professionally qualified personnel.
Do not clean the appliance and/or its parts with easily inflammable substances (e.g. petrol, alcohol, etc.).
Do not leave containers with inflammable substances in the room where the appliance is installed.
4.02 System checks (to be performed once a year)
The system is generally checked at the end of the winter season. Check that the water in the expansion vessel is
pressurised. Verify serviceability and operation of the pumps.
4.03 Boiler checks (to be performed once a year)
• Check the boiler for correct operation by effecting ignition and shut-down tests using the regulation
thermostat.
• Check on the rear wall of the boiler, at the height of the draught diverter, that there are no flue gas leaks, signs
of any blockages in the flue or insufficient draught.
• Check that the connecting pipe between the boiler and flue is perfectly sealed at the joints.
4.04 Cleaning the boiler and the fl ue
To be performed once every 3 years.
4.05 Cleaning the burner assembly
To be performed once a year.
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INSTALLATION AND MAINTENANCE INSTRUCTIONS
5. DESCRIPTION OF THE BOILER
5.01 presentation of the boiler
The “Rendimax N EL PV” floor-standing boilers are gas-fired heat generators for central heating systems, with
cast-iron bodies.
They are fitted with electronic ignition devices, automatic operation control (electronic flame control unit) and flue
gas sensors for verifying the correct discharge of the combustion gases.
The “Rendimax N EL PV” models are also pre-fitted with a variable-speed pump, expansion vessel and safety
valve.
The boilers are manufactured as standard for operation on natural gas (G20).
The appliance can be converted from operation on natural gas to lpg (G31); refer to the instructions provided in
paragraph 12.
5.02 instructions and requirements
The assembly, installation, commissioning and maintenance of the boiler must be performed by specialist companies, following all the relative technical requirements and standards. The boiler must be installed according to the
standards and laws in force, in particular regarding the size of the boiler room, the discharge of flue gases, the
water piping, the combustible gas supply system and the electrical system.
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