Immergas NIKE MYTHOS 24 2 E Instruction And Warning Book

Page 1
Instruction and
*1.038789ENG*
warning book
IE
NIKE MYTHOS
24 2 E
Page 2
Dear Customer,
Our compliments for having chosen a top-quality Immergas product, able to assure well-being and safety for a long period of time. As an Immergas customer you can also count on a qualied aer-sales service, prepared and updated to guarantee constant eciency of your boiler. Read the following pages carefully: you will be able to draw useful suggestions regarding the correct use of the appliance, the respect of which, will conrm your satisfaction for the Immergas product.
Contact our area authorised aer-sales centre as soon as possible to request commissioning. Our technician will verify the correct functioning conditions; he will perform the necessary calibrations and will demonstrate the correct use of the generator.
For assistance and scheduled maintenance contact Authorised Immergas Aer-Sales centres: they have original spare parts and are specically trained directly by the manufacturer.
General recommendations
All Immergas products are protected with suitable transport packaging. e material must be stored in dry environments protected against bad weather. e instruction book is an integral and essential part of the product and must be consigned to the new user also in the case of transfer or succession of ownership. It must be stored with care and consulted carefully, as all of the warnings provide important safety indications for installation, use and maintenance stages. is instructions manual provides technical information for installing Immergas boilers. As for the other issues related to boiler installation (e.g. safety in the work
site, environment protection, injury prevention), it is necessary to comply with the provisions specied in the regulations in force and principles of good practice. In compliance with legislation in force, the systems must be designed by qualied professionals, within the dimensional limits established by the Law. Installation
and maintenance must be performed in compliance with the regulations in force, according to the manufacturer's instructions and by professionally qualied sta, intending sta with specic technical skills in the plant sector, as envisioned by the Law.
Improper installation or assembly of the Immergas appliance and/or components, accessories, kit and devices can cause unexpected problems to people, animals and objects. Read the instructions provided with the product carefully to ensure a proper installation.
Maintenance must be carried out by skilled technical sta. e Immergas Authorised Aer-sales Service represents a guarantee of qualications and professionalism.
e appliance must only be destined for the use for which it has been expressly declared. Any other use will be considered improper and therefore potentially dangerous.
If errors occur during installation, operation and maintenance, due to non compliance with technical laws in force, standards or instructions contained in this book (or however supplied by the manufacturer), the manufacturer is excluded from any contractual and extra-contractual liability for any damages and the appliance warranty is invalidated.
For further information regarding legislative and statutory provisions relative to the installation of gas heat generators, consult the Immergas site at the following address: www.immergas.com
Immergas S.p.A. declines all liability due to printing or transcription errors, reserving the right to make any modications to its technical and commercial documents without forewarning.
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INDEX
1 Boiler installation ...................................... 4
1.1 Installation recommendations. ................4
1.2 Main dimensions. ......................................5
1.3 Connections (Optional). .......................... 5
1.4 Remote controls and room chrono-
thermostats (Optional). ............................ 6
1.5 Ventilation of the rooms...........................7
1.6 Flue ducts. .................................................. 7
1.7 Flues/Chimneys. ........................................7
1.8 System lling. ............................................. 7
1.9 Gas system start-up. ..................................7
1.10 Boiler commissioning (ignition). ................8
1.11 Circulation pump. .....................................8
1.12 Kits available on request. .......................... 8
1.13 Boiler components. ...................................9
USER page INSTALLER page MAINTENANCE TECHNICIAN page
2 Instructions for use and maintenance ..10
2.1 Cleaning and maintenance. ...................10
2.2 Ventilation of the rooms.........................10
2.3 General warnings. ................................... 10
2.4 Control panel. ..........................................10
2.5 Troubleshooting. .....................................11
2.6 Restoring central heating system
pressure. .................................................... 11
2.7 System draining. .....................................11
2.8 Anti-freeze protection. ...........................12
2.9 Case cleaning. .......................................... 12
2.10 Decommissioning. ..................................12
3 Boiler commissioning
(initial check) ...........................................13
3.1 Hydraulic diagram. .................................13
3.2 Wiring diagram. ......................................14
3.3 Troubleshooting. .....................................14
3.4 Converting the boiler to other types of
gas. ............................................................. 15
3.5 Checks following conversion to another
type of gas. ................................................ 15
3.6 Possible adjustments. ..............................15
3.7 Programming the P.C.B. .........................15
3.8 Automatic slow ignition function with
timed ramp delivery. ............................... 16
3.9 "Chimney sweep function". ...................16
3.10 Heating Timer. .........................................16
3.11 Pump anti-block function. .....................16
3.12 Radiators anti-freeze function. ..............16
3.13 P.C.B. periodical self-check. ...................16
3.14 Casing removal. .......................................17
3.15 Yearly appliance check
and maintenance. ....................................18
3.16 Variable heat output. ...............................18
3.17 Combustion parameters. ........................19
3.18 Technical data. .........................................19
3.19 Data plate key. ..........................................20
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BOILER
1
INSTALLATION

1.1 INSTALLATION RECOMMENDATIONS.

e Nike Mythos 24 2E boiler has been designed for wall mounted installation only, for heating environments and production of domestic hot water for domestic use and similar purposes. e place of installation of the appliance and relative Immergas accessories must have suitable features (technical and structural) such to allow
INSTALLERUSER
(always in safety, efficiency and comfortable conditions):
- installation (according to the provisions of the
technical legislation and technical regulations);
- maintenance operations (including scheduled,
periodic, routine and special maintenance);
- removal (to outdoors in the place for
loading and transporting the appliances and components) as well as their eventual replacement with appliances and/or equivalent components.
e wall surface must be smooth, without any protrusions or recesses enabling access to the rear part. ey are not designed to be installed on plinths or oors (Fig. 1-1).
Only professionally enabled companies are authorised to install Immergas gas appliances. Installation must be carried out according to regulation standards, current legislation and in compliance with local technical regulations and the required technical procedures. Before installing the appliance, ensure that it is delivered in perfect condition; if in doubt, contact the supplier immediately. Packing materials (staples, nails, plastic bags, polystyrene foam, etc.) constitute a hazard and must be kept out of the reach of children. If the appliance is installed inside or between cabinets, ensure sucient space for normal servicing; therefore it is advisable to leave clearance of at least 3 cm between the boiler casing and the vertical sides of the cabinet. Leave adequate space above the boiler for possible water and ue removal connections. It is just as important that the intake grids are not obstructed. Keep all ammable objects away from the appliance (paper, rags, plastic, polystyrene, etc.). Do not place household appliances underneath the boiler as they could be damaged if the safety valve intervenes with an obstructed conveying system (the safety valve must be conveyed away by a draining funnel), or
MAINTENANCE TECHNICIAN
if there are leaks from the hydraulic connections; on the contrary, the manufacturer cannot be held responsible for any damage caused to the household appliances.
For the aforementioned reasons, we recommend not placing furnishings, furniture, etc. under the boiler. In the event of malfunctions, faults or incorrect operation, turn the appliance o immediately and contact an authorised company (e.g. the Immergas Technical Assistance centre, which has specically trained sta and original spare parts). Do not attempt to modify or repair the appliance alone. Failure to comply with the above implies personal responsibility and invalidates the warranty.
• Installation regulations:
- these boilers cannot be installed in bedrooms, studio ats and bathrooms. ey also cannot be installed in rooms with wood (or solid fuel) burning heat generators and in adjacent and communicating rooms;
- installation in places with a fire risk is prohibited (for example: garages, closed parking stalls), gas appliances and relative ue ducts, ue exhaust pipes and combustion air intake pipes;
- installation is prohibited on the vertical projection of cooking hobs;
- installation is also prohibited in places/ environments that constitute common parts of oce condominiums such as stairs, cellars, entrance halls, attics, los, escape routes, etc. if they are not located inside technical compartments under the responsibility of each individual building and only accessible to the user (for the features of the technical compartments, see the technical standards in force);
- type B open chamber boilers must not be installed in places where commercial, artisan or industrial activities take place, which use products that may develop volatile vapours or substances (e.g. acid vapours, glues, paints, solvents, combustibles, etc.), as well as dusts (e.g. dust deriving from the working of wood, coal nes, cement, etc.), which may be harmful for the components of the appliance and jeopardise operation;
- they must also be installed in rooms where the temperature cannot fall below 0°C and must not be exposed to weathering.
Attention: wall mounting of the boiler must guarantee stable and ecient support for the generator.
e plugs (standard supply) are to be used only in conjunction with the mounting brackets or xing template to x the appliance to the wall; they only
ensure adequate support if inserted correctly (according to technical standards) in walls made
of solid or semi-hollow brick or block. In the case of walls made from hollow brick or block, partitions with limited static properties, or in any case walls other than those indicated, a static test must be carried out to ensure adequate support.
N.B.: the hex head screws supplied in the blister pack are to be used exclusively to x the relative mounting bracket to the wall.
ese boilers are used to heat water to below boiling temperature in atmospheric pressure. ey must be connected to a central heating system and hot water circuit suited to their performance and capacity.
YES NO
Fig. 1-1
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1.2 MAIN DIMENSIONS.

Key: G - Gas supply AC - Domestic hot water outlet AF - Domestic cold water inlet R - System return M - System ow V - Electrical connection
N.B.: connection group (optional)
Fig. 1-2
Height
(mm)
751 440 240
GAS
G AC AF R M
3/4” 1/2” 1/2” 3/4” 3/4”
Width (mm) Depth (mm)
CONNECTIONS
DOMESTIC
WATER
SYSTEM
1.3 CONNECTIONS OPTIONAL. Gas connection (Appliance category II
Our boilers are designed to operate with methane gas (G20) or LPG. Supply pipes must be the same as or larger than the 3/4”G boiler tting. Before connecting the gas line, carefully clean inside all the fuel feed system pipes to remove any residue that could impair boiler eciency. Also make sure the gas corresponds to that for which the boiler is prepared (see boiler data-plate). If dierent, the appliance must be converted for operation with the other type of gas (see converting appliance for other gas types). e dynamic gas supply (methane or LPG) pressure must also be checked according to the type used in the boiler, which must comply with the regulations in force, as insucient levels can reduce generator output and cause malfunctions. Ensure correct gas cock connection by following the mounting instructions illustrated in the figure. The gas supply pipe must be suitably dimensioned according to current regulations in order to guarantee correct gas ow to the burner even in conditions of maximum generator output and to guarantee appliance efficiency (technical specications). e coupling system must conform to standards.
Fuel gas quality. The appliance has been designed to operate with combustible gas free of impurities; otherwise it is advisable to t special lters upstream of the appliance to restore the purity of the fuel.
Storage tanks (in case of supply from LPG depot).
- New LPG storage tanks may contain residual inert gases (nitrogen) that degrade the mixture delivered to the appliance casing functioning anomalies.
- Due to the composition of the LPG mixture, layering of the mixture components may occur during the period of storage in the tanks. is can cause a variation in the heating power of the mixture delivered to the appliance, with subsequent change in its performance.
2H3+
).
INSTALLERUSER
MAINTENANCE TECHNICIAN
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Hydraulic connection.
Attention: in order not to void the heat primary
exchanger warranty, before making the boiler connections, carefully clean the heating system (pipes, radiators, etc.) with special pickling or de-scaling products to remove any deposits that could compromise correct boiler operation.
A chemical treatment of the thermal system water is required, in compliance with the technical standards in force, in order to protect the system and the appliance from deposits (e.g.,
INSTALLERUSER
limescale), slurry or other hazardous deposits.
Water connections must be made in a rational way using the couplings on the boiler template. e boiler safety valve outlet must be connected to an appropriate drain. Otherwise, the manufacturer declines any responsibility in case of ooding if the drain valve cuts in.
In order to meet the system requirements established by the regulations in terms of pollution of drinking water, we recommend installing the IMMERGAS anti-backow kit to be used upstream of the cold water inlet connection of the boiler. It is also recommended that the heat transfer uid (e.g. water + glycol) entered in the primary circuit of the boiler (heating circuit), complies with the local regulations in force.
Attention: to preserve the duration of appliance eciency features, in the presence of water whose features can lead to the deposit of lime scale, installation of the “polyphosphate dispenser” kit is recommended.
Electrical connection. e Nike Mythos 24 2E boiler has an IPX4D protection rating for the entire appliance. Electrical safety of the appliance is reached only when it is correctly connected to an ecient earthing system as specied by current safety standards.
Attention: Immergas S.p.A. declines any responsibility for damage or physical injury caused by failure to connect the boiler to an ecient earth system or failure to comply with the reference standards.
Also ensure that the electrical installation corresponds to maximum absorbed power specications as shown on the boiler data-plate. Boilers are supplied complete with an “X” type power cable without plug. e power supply cable must be connected to a 230V ±10% / 50Hz mains supply respecting L-N polarity and earth
MAINTENANCE TECHNICIAN
connection; , this network must also have a multi-pole circuit breaker with class III over­voltage category. When replacing the power supply cable, contact a qualied company (e.g. the Immergas Authorised
Aer-Sales Technical Assistance Service). e power cable must be laid as shown (Fig. 1-3). In the event of mains fuse replacement on the P.C.B., use a 2A quick-blow fuse. For the main power supply to the appliance, never use adapters, multiple sockets or extension leads.
1.4 REMOTE CONTROLS AND ROOM CHRONOTHERMOSTATS OPTIONAL.
e boiler is prepared for the application of room chrono-thermostats or remote controls, which are available as optional kits. (Fig. 1-4) All Immergas chrono-thermostats are connected with 2 wires only. Carefully read the user and assembly instructions contained in the accessory kit.
• On/O digital chrono-thermostat. e chrono-
thermostat allows:
- set two room temperature value: one for
daytime (comfort temperature) and one for nighttime (lower temperature);
- set a weekly programme with four daily
switch on and switch o times;
- select the required operating mode from the
various possible alternatives:
- manual mode (with adjustable temperature);
- automatic mode (with set programme);
- forced automatic mode (momentarily
changing the temperature of the automatic programme).
e chrono-thermostat is powered by two 1.5V
LR 6 type alkaline batteries.
• Comando Amico Remoto Remote Control
Device V2 (CARV2) with climate chrono­thermostat function. In addition to the functions described in the previous point, the CARV2 panel enables the user to control all the important information regarding operation of the appliance and the heating system with the opportunity to easily intervene on the previously set parameters, without having to go to where the appliance is installed. e panel is provided with self-diagnosis to display any boiler functioning anomalies. e climate chrono-thermostat incorporated into the remote panel enables the system ow temperature to be adjusted to the actual needs of the room being heated, in order to obtain the desired room temperature with extreme precision and therefore with evident saving in running costs. e chrono-thermostat is fed directly by the boiler by means of the same 2 wires used for the transmission of data between boiler and chrono-thermostat.
CARV2 or chrono-thermostat On/O electric connection (Optional). e operations described
below must be performed aer having removed the voltage from the appliance. Any On/O room
chrono-thermostat must be connected to clamps 40 and 41 eliminating jumper X40 (Fig. 3-2). Make sure that the On/O thermostat contact is of the “clean” type, i.e. independent of the mains supply, otherwise the P.C.B. would be damaged. Any CARV2 must be connected to clamps 40 and 41 eliminating jumper X40 on the circuit board, paying attention not to invert the polarity in the connections (Fig. 3-2). 3-2). Connection with the wrong polarity prevents functioning, but without damaging the CARV2 e boiler can only be connected to one remote control.
Important: if the CARV2 remote control is used, arrange two separate lines in compliance with current regulations regarding electrical systems. No boiler pipes must ever be used to earth the electric system or telephone lines. Ensure elimination of this risk before making the boiler electrical connections.
POWER SUPPLY CABLE
CAVO ALIMENTAZIONE
Fig. 1-3
Fig. 1-4
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1.5 VENTILATION OF THE ROOMS.

In the room in which the boiler is installed it is necessary that at least as much air ows as that requested for by normal combustion of the gas and ventilation of the room. Natural air ow must take place directly through:
- permanent openings in the walls of the room to be ventilated that lead towards the outside;
- ventilation pipes, individual or branched type.
e air used for ventilation must be withdrawn directly from outside, in an area away from sources of pollution. Natural air flow is also allowed indirectly by air intake from adjoining rooms. For further information relative to ventilation of the rooms follow that indicated by the standards in force and the following modications and integrations.
Evacuation of foul air. In the rooms where the gas appliances are installed it may also be necessary, as well as the intake of combustion agent air, to evacuate foul air, with consequent intake of a further equal amount of clean air. is must be realised respecting the provisions of the technical regulations in force.

1.6 FLUE DUCTS.

e gas appliances with attachment for the ue gas discharge pipe must have direct connection to chimneys or safely ecient ues. The combustion products can be discharged directly outside only if these are missing, as long as the standard regulations for the ue terminal are respected as well as the existing laws.
Connection to chimneys or flues. The connection of the appliances to a chimney or ue takes place by means of ue ducts.
In the event of ttings with pre-existing ues, these must be perfectly clean because the detachment of any waste from the walls during functioning, could block the passage of ue gases, thus causing extremely dangerous situations for the user.
e ue ducts must be connected to the chimney or ue in the same room in which the appliance is installed or, at most, in the adjoining room and must comply with the requirements indicated by the regulation.

1.7 FLUES/CHIMNEYS.

For the appliances with natural draught individual chimneys and branched flues can be used.
Individual chimneys. e individual ues must be dimensioned with respect to the standard in force.
Branched ues. In buildings with lots of oors, branched flues can be used for the natural draught evacuation of combustion products. New ues must be designed following the calculation method and provisions of the regulation.
Chimney caps. A chimney cap is a device crowning an individual chimney or collective branched flue. The device facilitates the dispersion of combustion products, even with bad weather, and prevents the deposit of foreign bodies. It must meet the standard requirements e outlet quota, corresponding to the top of the chimney/ue, independently of any caps, must be out of the “backow area”, in order to prevent the formation of counter-pressures that impede the free discharge of the combustion products into the atmosphere. It is therefore necessary to use the minimum heights indicated in the gures stated in the regulation, depending on the slope of the roof.
Direct exhaust outside. e natural draught appliances, envisioned to be connected to a chimney or a ue, can discharge the combustion products directly to the outside, through a pipe passing through the perimeter walls of the building. In this case discharge takes place through an exhaust ue, which is connected to a draught terminal at the outside.
Exhaust flue. The exhaust flue must be in compliance with the same requisites listed for the ue ducts, with further provisions stated in the regulation in force.
Positioning the exhaust terminals. e exhaust terminals must:
- be installed on external perimeter walls of the building;
- be positioned according to the minimum distances specified in current technical standards.
Fume exhaust of forced draught appliances in closed open-top environments. In spaces
closed on all sides with open tops (ventilation pits, courtyards etc.), direct flue gas exhaust is allowed for natural or forced draught gas appliances with a heating power range from 4 to 35 kW, provided the conditions as per the current technical standards are respected.
Important: it is prohibited to put the fumes exhaust control device out of order voluntarily. Every piece of this device must be replaced using original spare parts if they have deteriorated. In the case of repeated interventions of the fumes exhaust control device, check the fumes exhaust ue and the ventilation of the room in which the boiler is located.

1.8 SYSTEM FILLING.

Once the boiler is connected, proceed with system filling via the filling valve (Fig. 2-2). Filling is performed at low speed to ensure release of air bubbles in the water via the boiler and heating system vents. e boiler has a built­in automatic venting valve on the circulator. Open the radiator vent valves. Close radiator vent valves when only water escapes from them. Close the lling valve when the boiler manometer indicates approx. 1.2 bar.
N.B.: during these operations start up the circulation pump at intervals, acting on the main switch positioned on the control panel. Vent the
circulation pump by loosening the front cap and keeping the motor running.
Tighten the cap aer the operation.
1.9 GAS SYSTEM STARTUP.
To start up the system, make reference to the Standard: is divides the systems and therefore the start-up operations into three categories: new systems, modied systems, re-activated systems. In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or open ames;
- bleed all air from the pipelines;
- check that the internal system is properly sealed according to specications.
INSTALLERUSER
MAINTENANCE TECHNICIAN
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1.10 BOILER COMMISSIONING IGNITION.
In order to issue the Declaration of Conformity required by the regulations in force, one must comply with the following requirements to commission the boiler (the operations listed below must only be performed by qualified personnel and in the presence of sta only):
- check that the internal system is properly sealed
according to the regulations in force;
- make sure that the type of gas used corresponds
to boiler settings;
INSTALLERUSER
- check that there are no external factors that
may cause the formation of fuel pockets;
- switch the boiler on and check correct ignition;
- make sure that the gas ow rate and relevant
pressure values comply with those given in the manual (par. 3.16);
- check the correct ventilation of the rooms;
- check the existing draught during normal
functioning of the appliance, e.g. a draught gauge positioned at the exit of the appliance combustion products;
- check that there is no backow of combustion
products into the room, even during functioning of fans;
- ensure that the safety device intervenes in the
event of gas supply failure and check the relative intervention time;
- check activation of the main switch located
upstream of the boiler.
e boiler must not be started up even if only one of the checks should be negative.
N.B.: the preliminary boiler check must be carried out by an authorised company. e standard boiler warranty is valid from the date of inspection. e test certicate and warranty is issued to the us er.

1.11 CIRCULATION PUMP.

The Nike Mythos 24 2E series boilers are supplied with a built-in circulation pump with three-position electric speed control. e boiler does not operate correctly with the circulation pump on rst speed. To ensure optimal boiler operation, in the case of new systems (single pipe and module) it is recommended to use the pump at maximum speed. e circulation pump is already tted with a capacitor.
Pump release. If, aer a prolonged period of inactivity, the circulation pump is blocked, unscrew the front cap and turn the motor sha using a screwdriver. Take great care during this operation to avoid damage to the motor.
By-pass regulation (part. 16 Fig. 1-6). If necessary, the by-pass can be adjusted according to system requirements from a minimum (by­pass excluded) to a maximum (by-pass inserted) represented by the graph (Fig. 1-5). Make the adjustment using a at head screwdriver, turn clockwise and insert the by-pass; by turning it anti-clockwise it is excluded.

1.12 KITS AVAILABLE ON REQUEST.

• Connection unit kit (on request). The kit includes pipes, ttings and cocks (including gas cock), to carry out all connections to the boiler system
• System shut o valves kit. e boiler is designed for installation of system interception cocks to be placed on ow and return pipes of the connection assembly. is kit is particularly useful for maintenance as it allows to drain just the boiler without having to empty the entire system.
• Polyphosphate dispenser kit. e polyphosphate dispenser reduces the formation of lime-scale and preserves the original heat exchange and domestic hot water production conditions. e boiler is prepared for application of the polyphosphate dispenser kit.
e above-mentioned kits are supplied complete with instructions for assembly and use.
MAINTENANCE TECHNICIAN
Head available to the system.
Head (kPa)
A
B
C
D
Flow rate (l/h)
A = Head available to the system at maximum
speed with by-pass excluded
B = Head available to the system at maximum
speed with by-pass inserted
C = Head available to the system at second
O)
2
Head (m H
speed with by-pass excluded
D = Head available to the system at second
speed with by-pass inserted
Fig. 1-5
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1.13 BOILER COMPONENTS.

INSTALLERUSER
Key: 1 - Fumes hood 2 - System pressure switch 3 - Boiler circulator pump 4 - Domestic hot water ow switch 5 - Gas valve 6 - System lling valve 7 - Flue safety thermostat 8 - Primary heat exchanger 9 - Delivery probe 10 - Safety thermostat
MAINTENANCE TECHNICIAN
11 - Combustion chamber 12 - Ignition and detection electrodes 13 - System expansion vessel 14 - Burner 15 - Vent valve 16 - By-pass 17 - DHW heat exchanger 18 - ree-way valve (motorised) 19 - 3 bar safety valve 20 - System draining valve
N.B.: connection group (optional)
Fig. 1- 6
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INSTRUCTIONS FOR USE
2
AND MAINTENANCE

2.1 CLEANING AND MAINTENANCE. Attention: the heating systems must undergo

periodical maintenance (regarding this, see the section dedicated to the maintenance engineer, relating to “yearly appliance check and maintenance”) and regular energy eciency checks in compliance with national, regional or local provisions in force. is ensures that the optimal safety, per formance
INSTALLERUSER
and operation characteristics of the boiler remain unchanged over time. We recommend stipulating a yearly cleaning and maintenance contract with your zone technician.

2.2 VENTILATION OF THE ROOMS.

In the room in which the boiler is installed it is necessary that at least as much air ows as that requested for by normal combustion of the gas and ventilation of the room. e provisions relative to ventilation, the ue ducts, chimneys and caps are stated in Par. 1.5, 1.6 and 1.7. If in doubt regarding correct ventilation, refer to professional, qualied sta..

2.3 GENERAL WARNINGS.

Never expose the wall-mounted boiler to direct vapours from a cooking surface. Use of the boiler by unskilled persons or children is strictly prohibited. If temporary shutdown of the boiler is required, proceed as follows: a) drain the heating system if anti-freeze is not
used;
b) shut-o all electrical, water and gas supplies.
In the case of work or maintenance to structures located in the vicinity of ducting or devices for flue extraction and relative accessories, switch o the appliance and on completion of operations ensure that a qualied technician checks eciency of the ducting or other devices. Never clean the appliance or connected parts with easily ammable substances. Never leave containers or ammable substances in the same environment as the appliance. It is prohibited and dangerous to obstruct the air intake, even partially, for the ventilation of the room in which the boiler is installed. Due to the danger, functioning is also prohibited in the same room as suction devices, chimneys or similar at the same time as the boiler unless there are additional openings dimensioned in a way to satisfy the further necessity for air. For the dimensioning of these additional openings, refer to qualied technical sta. In particular, an open re must have its own air supply. On the contrary, the boiler cannot be installed in the same room.
Attenzione: the use of components involving use of electrical power requires some fundamental rules to be observed:
- do not touch the appliance with wet or
moist parts of the body; do not touch when barefoot;
- never pull electrical cables or leave the
appliance exposed to weathering (rain, sunlight, etc.);
- the appliance power cable must not be
replaced by the user;
- in the event of damage to the cable, switch
off the appliance and contact exclusively qualied sta for replacement;
- if the appliance is not to be used for a certain period, disconnect the main power switch.

2.4 CONTROL PANEL.

Fig. 2-1
MAINTENANCE TECHNICIAN
Key: 1 - Reset button 2 - Stand-by/summer/winter button 3 - Button (+) to increase
the domestic hot water temperature
4 - Button (-) to reduce
the domestic hot water temperature
5 - Button(+) to increase the system water
temperature
6 - Button (-) to reduce the system water
temperature 7 - Boiler manometer 8 - Domestic hot water functioning 9 - Temperatures and error code display 10 - Unit of measurement
11 - Central heating functioning 12 - Winter 13 - Summer 14 - Power distributed 15 - Flame presence
10
Page 11
Boiler ignition. Before ignition make sure the heating system is lled with water and that the manometer (7) indicates a pressure of 1 ÷ 1.2 bar.
- Open the gas cock upstream from the boiler.
- Press key (2) and set the boiler on Summer ( ) or Winter ( ).
N.B.: the button (2) must be pressed and
held for the time required to switch from the Stand-by ( ), Summer ( ) or Winter ( ) function.
Attention: aer each switch the button must
in any case be released to switch to the next function.
When in summer position ( ) the domestic hot water temperature is adjusted with the but­tons (3-4).
When the winter position is selected ( ) the system water temperature is adjusted with the buttons (5-6), whilst the domestic hot water temperature is adjusted using the buttons (3-4), by pressing (+) to increase and (-) to reduce the temperature.
From this moment the boiler functions auto­matically. With no demand for heat (heating or domestic hot water production) the boiler goes to “standby” function, equivalent to the boiler being powered without presence of ame. Each time the boiler ignites, the relative ame present symbol is displayed (15).

2.5 TROUBLESHOOTING.

In the event of an anomaly the boiler backlight turns from green to red on and the relative error codes, listed in the table, ash on the display.
Anomaly signalled
No ignition block 01 Over-heating (safety) thermostat
block Flue safety thermostat anomaly 03 Electro-mechanical contacts 04 Flow probe anomaly 05 Insucient system pressure 10 Parasite ame 20 Insucient circulation 27 Loss of remote control commu-
nication
Ignition block. e boiler ignites automatically with each request for room heating or hot water production. If the burner does not ignite within 10 seconds, the boiler goes into "ignition block" (code 01). To eliminate “ignition block” the Reset button (1) must be pressed. On commissioning or aer extended appliance downtime, it may be necessary to eliminate the “ignition block”. If this phenomenon occurs frequently, contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
code
error
02
31
Overheating thermostat block. During normal operation, if a fault causes excessive overheating internally, the boiler goes into overheating block (code 02). Aer allowing to cool, eliminate the "overheating block" by pressing the Reset key (1). If this phenomenon occurs frequently, contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
Flue safety thermostat anomaly. If the flue evacuation pipe does not work properly during functioning, the ue thermostat intervenes by blocking the boiler (code 03). The boiler will automatically restart aer 30 minutes if normal conditions resume without having to be reset. If the ue thermostat intervenes 3 times in less than two hours (code 03), it is necessary to reset the boiler manually by pressing the Reset button (1). If this anomaly persists, contact a qualied technician for assistance (e.g. Immergas Aer­Sales Service).
Electro-mechanical contacts is occurs when the safety thermostat, the fume pressure switch or the system pressure switch do not work properly (code 04). e boiler does not start; try resetting the boiler. If the anomaly persists contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
Delivery probe anomaly If the board detects an anomaly on the ow probe (code 05), the boiler will not start; contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
Insucient system pressure. Water pressure inside the heating system (code 10), sucient to guarantee the correct functioning of the boiler, is not detected. Check that the system pressure is between 1÷1.2 bar.
Parasite ame. is occurs in the event of a leak on the detection circuit or anomaly in the ame control unit (code 20); try to reset the boiler. If the anomaly persists contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
Insucient water circulation. is occurs if the boiler overheats due to insucient water circulating in the primary circuit (code 27); the causes can be:
- low system circulation; check that no shut-o devices are closed on the heating circuit and that the system is free of air (deaerated);
- pump blocked; free the pump.
If this phenomenon occurs frequently, contact an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
Loss of Remote Control communication. is occurs 1 minute aer loss of communication between the boiler and the remote control (code
31). To reset the error code, remove and re-apply
voltage to the boiler. If this phenomenon occurs frequently, contact an authorised company (e.g. Immergas After-Sales Technical Assistance Service).
Boiler shutdown. Press the button (2 Fig. 2-1) ( ) until the symbol ( ) appears on the
di splay.
N.B.: in these conditions the boiler is still powered.
Disconnect the external omnipolar boiler switch and close the gas cock upstream of the appliance. Never leave the boiler switched on if le unused for prolonged periods.

2.6 RESTORING CENTRAL HEATING SYSTEM PRESSURE.

Periodically check the system water pressure. e boiler manometer should read a pressure between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool) restore normal pressure via the lling cock located in the lower part of the boiler (Fig. 2-2).
N.B.: close the lling cock aer the operation. If pressure values reach around 3 bar the safety valve may be activated. In this case contact a professional technician for assistance.
In the event of frequent pressure drops, contact qualied sta for assistance to eliminate the pos­sible system leakage.

2.7 SYSTEM DRAINING.

To drain the boiler, use the special draining valve (Fig. 2-2). Before draining, ensure that the lling valve is closed.
INSTALLERUSER
MAINTENANCE TECHNICIAN
11
Page 12
2.8 ANTIFREEZE PROTECTION.
e boiler features an antifreeze function that automatically ignites the burner when the tem­perature falls below 4°C and stops once 42°C have been exceeded. e antifreeze function is ensured if the appliance is in perfect working order in all its parts, if it is not “blocked”, and if it is not in “o ” mode. To avoid keeping the system switched on in case of a prolonged absence, the system must be drained completely or antifreeze substances must be added to the heating system water. In both cases the boiler domestic hot wa-
INSTALLERUSER
ter circuit must be drained. In systems that are drained frequently, lling must be carried out with suitably treated water to eliminate hardness that can cause lime-scale.

2.9 CASE CLEANING.

Use damp cloths and neutral detergent to clean the boiler casing. Never use abrasive or powder detergents.

2.10 DECOMMISSIONING.

In the event of permanent shutdown of the boiler, contact professional sta for the procedures and ensure that the electrical, water and gas supply lines are shut o and disconnected.
MAINTENANCE TECHNICIAN
Bottom view.
Key: 1 - Filling valve 2 - Draining valve
Fig. 2-2
12
Page 13
BOILER COMMISSIONING
3
INITIAL CHECK
To commission the boiler:
- make sure that the declaration of conformity for installation is supplied with the appliance;
- make sure that the type of gas used corresponds to boiler settings;
- check connection to a 230V-50Hz power mains, correct L-N polarity and the earthing connection;
- make sure the central heating system is lled with water and that the manometer indicates a pressure of 1÷1.2 bar.
- switch the boiler on and check correct ignition;

3.1 HYDRAULIC DIAGRAM.

- make sure the gas maximum, intermediate and minimum ow rate and pressure values correspond to those given in the handbook par. 3.16;
- check activation of the safety device in the event of no gas, as well as the relative activation time;
- check activation of the main switch located upstream of the boiler;
- check the existing draught during normal functioning of the appliance, e.g. a draught gauge positioned at the exit of the appliance combustion products;
- check that there is no backow of combustion products into the room, even during functioning of fans;
- ensure activation of all adjustment devices;
- seal the gas ow rate regulation devices (if settings are modied);
- check the production of domestic hot water;
- check sealing eciency of water circuits;
- check ventilation and/or aeration of the installation room where required.
If even only a single safety check oers a negative result, do not commission the system.
INSTALLERUSER
Key: 1 - Domestic hot water ow switch 2 - System lling valve 3 - Flow limiter 4 - Gas valve 5 - System expansion vessel 6 - Burner 7 - Primary heat exchanger 8 - Fumes hood 9 - Flue safety thermostat 10 - Safety thermostat 11 - Delivery probe 12 - Vent valve 13 - Boiler circulator pump 14 - System draining valve 15 - System pressure switch 16 - DHW heat exchanger 17 - ree-way valve (motorised) 18 - By-pass 19 - 3 bar safety valve
G - Gas supply AC - Domestic hot water outlet AF - Domestic cold water inlet R - System return M - System ow
MAINTENANCE TECHNICIAN
13
Fig. 3-1
Page 14

3.2 WIRING DIAGRAM.

3
INSTALLERUSER
546
Key: B1 - Flow probe CARV2- Comando Amico Remoto remote
control Version 2 (optional) DS1 - Display E3 - Ignition and
detection electrode E4 - Safety thermostat E6 - Flue safety thermostat F1 - Phase fuse F2 - Neutral fuse
10
8
7
5
4
5
4
7
2
M1 - Boiler circulator pump M30 - ree-way valve S2 - Operation selector S3 - Block reset button S4 - Domestic hot water ow switch S5 - System pressure switch S20 - Room thermostat (optional) S21 - Domestic hot water temperature
increase button
S22 - Domestic hot water temperature
decrease button
7
4
7
8
7
8
9
998
9
5
S23 - Heating temperature increase
button
S24 - Heating temperature decrease
button T1 - Low voltage power supply unit T2 - Ignition transformer U1 - Rectier inside the gas valve
connector (only available on
Honeywell gas valves)
1
X40 - Room thermostat jumper Y1 - Gas valve Y2 - Gas valve modulator 1 - User interface 2 - N.B.: the user interface is on the
welding side of the boiler board 3 - Power supply 230Vac 50Hz 4 - Blue 5 - Brown 6 - Yellow/Green 7 - Black 8 - Grey 9 - White 10 - e x6 connector is used for
automatic inspection
Fig. 3-2
Comando Amico RemotoV2: the boiler is set­up for the application of the Comando Amico Remoto remote control V2 (CARV2) which must be connected to clamps 40 and 41, by observing polarity and eliminating jumper X40.
MAINTENANCE TECHNICIAN
Room thermostat: the boiler is set-up for the application of the Room ermostat (S20) which must be connected to clamps 40 and 41 and by eliminating jumper X40.
e connector X6 is for connection to a personal computer.

3.3 TROUBLESHOOTING. N.B.: maintenance interventions must be carried

out by an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit pipelines. Check sealing eciency of gas intake circuit.
- Irregular combustion (red or yellow ame). When the burner is dirty or the boiler lamellar pack is blocked. Clean the burner or the boiler lamellar pack.
- Frequent interventions of the over heating safety thermostat. It can depend on the lack of water in the boiler, little water circulation in the system or blocked pump. Check on the manometer that the system pressure is within established limits. Check that the radiator valves are not closed and also the functionality of the pump.
- e boiler produces condensate. is can be caused by obstructions of the chimney or ues with height or section not proportioned to the boiler. It can also be determined by functioning at boiler temperatures that are excessively low. In this case, make the boiler run at higher temperatures.
- Frequent interventions of the flue safety thermostat. is can be caused by obstructions in the fumes circuit. Check the ue. e ue may be obstructed or by height or section not suitable for the boiler. Ventilation may be insucient (see room ventilation point).
- Presence of air in the system. Check opening of the special air vent valve cap (Fig. 1-6). Make sure the system pressure and expansion vessel pressure values are within the set limits; the
pressure value for the expansion vessel must be
1.0 bar, and system pressure must be between 1 and 1.2 bar.
- Ignition block and Chimney block. (See par.
2.5 and 1.3 (electric connection).
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Page 15

3.4 CONVERTING THE BOILER TO OTHER TYPES OF GAS.

If the boiler has to be converted to a dierent gas type to that specied on the data plate, request the relative conversion kit for quick and easy conversion. e gas conversion operation must be carried out by an authorised company (e.g. Immergas Aer-Sales Technical Assistance Service). To convert to another type of gas the following operations are required:
- disconnect the appliance;
- replace the main burner injectors, making sure
to insert the special seal rings supplied in the kit, between the gas manifold and the injectors;
- re-power the appliance;
- select, using the boiler key, the gas parameter
type (P1) and select (nG) in the case of methane supply or (LG) in the case of LPG supply;
- adjust the boiler nominal heat output;
- adjust the boiler nominal heat output in
domestic hot water phase;
- adjust the boiler nominal heat output in heating
phase;
- adjust (eventually) the maximum heating
power;
- seal the gas ow rate regulation devices (if
settings are modied);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near the data-plate. Using an indelible marker pen, cancel the data relative to the old type of gas.
ese adjustments must be made with reference to the type of gas used, following that given in the table (Par. 3.16).

3.5 CHECKS FOLLOWING CONVERSION TO ANOTHER TYPE OF GAS.

Aer making sure that conversion was carried out with a nozzle of suitable diameter for the type of gas used and the settings are made at the correct pressure, check that:
- there is no ame in the combustion chamber;
- the burner ame is not too high or low and that
it is stable (does not detach from burner);
- the pressure testers used for calibration are
perfectly closed and there are no leaks from the gas circuit.
N.B.: all boiler adjustment operations must be carried out by an authorised company (e.g. Immergas After-Sales Assistance). Burner adjustment must be carried out using a dierential "U" or digital type pressure gauge connected to the gas valve outlet pressure point (part. 4 Fig. 3-3), keeping to the pressure value given in the table (Par. 3.16) according to the type of gas for which the boiler is prepared.

3.6 POSSIBLE ADJUSTMENTS.

• Adjustment of boiler nominal thermal heat output.
- Press the domestic hot water adjustment button (+) (3 Fig. 2-1) up to the maximum operating temperature.
- Open the domestic hot water cock in order to prevent modulation intervention.
- With the brass nut (3 Fig. 3-3) adjust the boiler nominal output, observing the maximum pressure values stated in the tables (Par. 3.16) depending on the type of gas.
- By turning in a clockwise direction the heating potential increases and in an anti-clockwise direction it decreases.
• Adjust the boiler minimum heat output in the domestic hot water phase (Fig. 3-3).
N.B.: only proceed aer having calibrated the
nominal pressure.
Adjustment of the minimum thermal input
is obtained by operating on the cross plastic screws (2) on the gas valve maintaining the brass nut blocked (3);
- disconnect the power supply to the modulating coil (just disconnect a faston); by turning the screw clockwise, the pressure increases, anti-clockwise it decreases. On completion of calibration, re-apply the power supply to the modulating coil. e pressure to which the boiler minimum power must be adjusted, must not be lower than that stated in the tables (Par.
3.16) depending on the type of gas.
N.B.: to adjust the gas valve, remove the plastic cap (6); aer adjusting, ret the cap.

3.7 PROGRAMMING THE P.C.B.

e boiler is prepared for possible programming of several operation parameters. By modifying these parameters as described below, the boiler can be adapted according to specic needs.
To access the programming phase, proceed as follows (references Fig. 2-1):
- press buttons (1) and (2) for 15 about seconds until the programming mode is accessed on the display;
- using buttons (3) and (4), select the parameter to be changed indicated in the following table:
List of
param-
eters
P1 Gas type selection
Special gas G110 selection (Not
P2
used on this model) Fixed or correlated domestic
P3
hot water set-point
P5 Minimum CH output
Description
- adjust the corresponding value consulting the table using keys (5) and (6);
- conrm the set value pressing the reset key (1) for approximately 5 seconds; pressing keys (3) + and (4) - at the same time to adjust the domestic hot water temperature, the operation is cancelled.
N.B.: aer a period of time, without touching
any keys, the operation cancels automatically.
Gas type selection. e setting of this function is used to adjust the boiler in order to function with LPG gas or Methane gas.
Gas type selection
Range of values which can be set
LG (LPG) o nG (Methane) P1
Gas G110 - Industrial gas (Not used on this model). e setting of this function is used to
adjust the boiler in order to function with gases from the rst family.
Gas G110 - Industrial gas (rst family gas)
Range of values which can be set
on - o (Standard setting) P2
Fixed or correlated domestic hot water set­point. By setting the parameter P3 in on mode,
burner disabling is correlated to the adjustment of the domestic hot water temperature. In OFF mode, the burner is switched o at maximum value.
Fixed or correlated domestic hot water
set-point
Range of values which can be set
on correlated - o xed (Stand-
ard settings)
Parameter
Parameter
Parameter
P3
INSTALLERUSER
MAINTENANCE TECHNICIAN
P6 Maximum CH output
P7 Central heating ignitions timer
P8 Central heating ramp timer
Boiler type (monothermal -
P9
bithermal)
15
Page 16
SIT 845 GAS Valve
Key: 1 - Coil 2 - Minimum power
adjustment screw
3 - Maximum power
adjustment nut
4 - Gas valve outlet pres-
sure point
5 - Gas valve inlet pres-
INSTALLERUSER
Heating output. e boiler also has electronic modulation that adapts the boiler potentiality to the eective heating demand of the house. en the boiler works normally in a variable gas pressure eld between the minimum heating output and the maximum heating output depending on the system's heating load.
N.B.: the boiler is produced and calibrated in the central heating phase at nominal output. Approximately 10 minutes are needed to reach the nominal heat output changeable using parameter (P6).
N.B.: the selection of the “Minimum heating output” and “Maximum heating output” parameters, in presence of a heating request, allows boiler ignition and power supply of the modulator with current equal to the value of the respective set value.
MAINTENANCE TECHNICIAN
Timer setting. The boiler has an electronic timing device that prevents the burner from igniting too oen in the heating phase. e boiler is supplied as per standard with a timer adjusted at 3 minutes.
sure point
6 - Protection hood
Fig. 3-3
Minimum CH output
Range of values which can be set
from 0 % Imax. to 63 % Imax. P5
Maximum CH output
Range of values which can be set
from 0 % Imax. to 99 % Imax. (Standard setting)
4
1
5
Parameter
Parameter
P6
3
2
6
Central heating ramp timing. The boiler performs an ignition ramp of about 10 minutes to arrive from minimum power to nominal heating power.
Central heating ramp timer
Range of values which can be set
from 1 to 10 10 = 10 minutes (Standard setting) 1 = 30 seconds
Boiler type. By selecting this parameter one can select the operation of the type of boiler being used: instantaneous monothermal boiler (0), bithermal boiler (1) or monothermal with boiler (2).
N.B.: according to the selection, also move the jumper (JP1) on the circuit board (Fig. 3-2): position 1-2 for bithermal boiler or position 2-3 for monothermal boiler. Attention: the boiler is already adjusted when it leaves the factory, therefore this function is only to be used in the event the circuit board is replaced.
Boiler type
Range of values which can be set
from 0 to 2 0 = monothermal boiler (in­stantaneous) 1 = bithermal boiler 2 = monothermal boiler (with boiler)
Parameter
P8
Parameter
P9

3.9 "CHIMNEY SWEEP FUNCTION".

When activated, this function forces the boiler at max. output for 15 minutes. In this state all adjustments are excluded and only the temperature safety thermostat and the limit thermostat remain active. To activate the chimney sweep function, press the Reset key for at least 10 seconds. Its activation is indicated by the flashing symbols (8 and 11 Fig. 2-1). is function allows the technician to check the combustion parameters. Aer the checks disable the function, switching the boiler o and then on again or simply by pressing the button (2 Fig. 2-1).

3.10 HEATING TIMER.

e boiler has an electronic timing device that prevents the burner from igniting too oen in the heating phase. e boiler is supplied as per standard with a timer adjusted at 3 minutes. To adjust the timer values, follow instructions for parameter settings by selecting parameter (P7) and set it with one of the values indicated on the relative table.
3.11 PUMP ANTIBLOCK FUNCTION.
In the “summer” functioning mode ( ) the boiler has a function that starts the pump at least once every 24 hours for 30 seconds in order to reduce the risk of the pump becoming blocked due to prolonged inactivity.
In the “winter” functioning mode ( ) the boiler has a function that makes the pump start at least once every 3 hours for 30 seconds.
3.12 RADIATORS ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler starts up until reaching 42°C.
3.13 P.C.B. PERIODICAL SELFCHECK.
During functioning in heating mode or with boiler in standby, the function activates every 18 hours aer the last boiler check/power supply. In case of functioning in domestic hot water mode the self-check starts within 10 minutes aer the end of the withdrawing in progress, for duration of approx. 10 seconds.
N.B.: during self-check, the boiler remains o, including signalling.
Central heating ignitions timer
Range of values which can be set
from 1 to 10 3 = 3 minutes (Standard set­ting) 1 = 30 seconds
Parameter
P7

3.8 AUTOMATIC SLOW IGNITION FUNCTION WITH TIMED RAMP DELIVERY.

In the ignition phase the P.C.B. carries out an increasing gas delivery ramp (with pressure values that depend on the type of gas selected) with preset duration. This prevents every calibration or precision adjustment of the boiler ignition phase in any conditions of use.
16
Page 17

3.14 CASING REMOVAL.

To facilitate boiler maintenance the casing can be completely removed as follows (Fig. 3-4):
- remove the frame (1) holding the edges and pulling it towards you as indicated by the arrows;
- undo the 2 front screws (2) and the 2 lower screws (3) which fasten the casing (4);
- pull the casing (4) towards yourself and upwards at the same time in order to detach it from the upper hooks.
INSTALLERUSER
4
2
MAINTENANCE TECHNICIAN
2
3
3
1
Fig. 3-4
17
Page 18

3.15 YEARLY APPLIANCE CHECK AND MAINTENANCE.

e following checks and maintenance should be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the draught-breaker/anti-wind
device for deterioration or corrosion.
- Check ignition and operation.
- Check correct calibration of the burner in
domestic hot water and central heating phases.
INSTALLERUSER
- Check the operation of the appliance control
and adjustment devices and in particular:
- intervention of main electrical switch
positioned outside of the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat
intervention.
- Check sealing eciency of the gas circuit and
the internal system.
- Check the intervention of the device against no
gas ionisation ame control. Intervention time must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valves
is not blocked.
- Check that, aer discharging system pressure and bringing it to zero (read on boiler pressure gauge), the expansion vessel load is at 1.0 bar.
- Check that the system static pressure (with system cold and aer relling the system by means of the lling valve) is between 1 and 1.2 bar.
- Visually check that the safety and control devices have not been tampered with and/or shorted, in particular:
- temperature safety thermostat;
- water pressure switch,
- ue exhaust control thermostat.
- Check the condition and integrity of the electrical system and in particular:
- electrical power cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
N.B.: when performing periodical maintenance of the appliance it is also good practice to check and perform maintenance on the heating system, in compliance with that indicated by the regulations in force.

3.16 VARIABLE HEAT OUTPUT.

METHANE (G20) BUTANE (G30) PROPANE (G31)
THERMAL
POWER
THERMAL
POWER
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
PRESS. BURNER
NOZZLES
BURNER GAS
FLOW RATE
(kW) (kcal/h) (m3/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O) (kg/h) (mbar) (mm H2O)
23.6 20296 2.78 12.60 128.5 2.08 26.60 271.3 2.04 34.90 355.9
23.0 19780 2.71 11.99 122.2 2.02 25.67 261.8 1.99 33.24 339.0
22.0 18920 2.59 11.01 112.3 1.94 24.15 246.3 1.90 30.59 312.0
21.0 18060 2.48 10.08 102.8 1.85 22.66 231.1 1.82 28.07 286.3
20.0 17200 2.36 9.21 93.9 1.76 21.19 216.1 1.73 25.68 261.9
MAINTENANCE TECHNICIAN
19.0 16340 2.25 8.38 85.4 1.68 19.75 201.3 1.65 23.40 238.7
18.0 15480 2.13 7.59 77.4 1.59 18.32 186.8 1.56 21.24 216.6
17.0 14620 2.02 6.85 69.8 1.51 16.91 172.4 1.48 19.19 195.7
16.0 13760 1.90 6.14 62.6 1.42 15.52 158.2 1.40 17.24 175.8
CH
+
D.H.W.
15.0 12900 1.79 5.48 55.9 1.34 14.13 144.1 1.32 15.39 156.9
14.0 12040 1.68 4.86 49.5 1.25 12.76 130.2 1.23 13.63 139.0
13.0 11180 1.57 4.27 43.5 1.17 11.40 116.3 1.15 11.97 122.1
12.0 10320 1.45 3.72 37.9 1.08 10.05 102.5 1.07 10.40 106.1
11.0 9460 1.34 3.20 32.6 1.00 8.70 88.7 0.98 8.92 91.0
10.0 8600 1.23 2.72 27.8 0.91 7.35 75.0 0.90 7.54 76.8
9.5 8170 1.17 2.50 25.5 0.87 6.68 68.1 0.86 6.87 70.1
8.0 6880
7.0 6020 0.88 1.50 15.3 0.65 3.30 33.7 0.64 3.90 39.8
D.H.W.
0.99 1.87 19.1 0.74 4.65 47.5 0.73 5.02 51.2
PRESS. BURNER
NOZZLES
N.B.: gas ow rates refer to heating power below a temperature of 15°C and pressure of 1013 mbar. Burner pressure values refer to use of gas at 15°C.
18
Page 19

3.17 COMBUSTION PARAMETERS.

G20 G30 G31
Gas nozzle diameter mm 1.30 0.80 0.80
supply pressure mbar (mm H2O) 20 (204) 29 (296) 37 (377)
Flue ow rate at nominal heat output kg/h 71 69 71
Flue ow rate at min heat output kg/h 61 55 58
CO2 at Nom./Min. Q. % 5.20 / 1.80 6.20 / 2.34 6.00 / 2.21
CO with 0% O2 at Nom./Min. Q. ppm 61 / 85 104 / 96 64 / 106
NOX with 0% of O2 at Nom./Min. Q. mg/kWh 147 / 88 242 / 106 242 / 98
Flue temperature at nominal output °C 112 116 114
Flue temperature at minimum output °C 91 80 96

3.18 TECHNICAL DATA.

Nominal heat input kW (kcal/h) 26,3 (22614) DHW minimum heat input kW (kcal/h) 8,3 (7124) CH minimum heat input kW (kcal/h) 11,0 (9489) Nominal heat output (useful) kW (kcal/h) 23,6 (20296) DHW minimum heat output (useful) kW (kcal/h) 7,0 (6020) CH minimum heat output (useful) kW (kcal/h) 9,5 (8170) Eciency at nominal heat output % 89,8 Eciency at 30% nominal heat output load % 88,8 Heat loss at case with burner On/O % 2,40 / 1,25 Heat loss at ue with burner On/O % 7,90 / 0,10 Central heating circuit max. operating pressure bar 3 Central heating circuit max. operating temperature °C 90 Adjustable central heating temperature °C 38 - 85 System expansion vessel total volume l 4,2 Expansion vessel factory-set pressure bar 1 Water content in generator l 1,9 Head available with 1000 l/h ow rate kPa (m H2O) 24,5 (2,5) Hot water production useful heat output kW (kcal/h) 23,6 (20296) Domestic hot water adjustable temperature °C 30 (38) - 60 (77) Domestic hot water circuit ow limiter at 2 bar l/min 7,7 Domestic circuit min. pressure (dynamic) bar 0,3 Domestic hot water circuit max. working pressure bar 10 Minimum D.H.W. ow rate l/min 1,5 Specic ow rate (∆T 30°C) l/min 11,1 Flow rate capacity in continuous duty (∆T 30°C) l/min - - ­Weight of full boiler kg 26,1 Weight of empty boiler kg 24,2 Electrical connection V/Hz 230/50 Nominal absorption A 0,4 Installed electric output W 100 Pump consumption W 74 Equipment electrical system protection - IPX4D Boiler ue circuit resistance Pa 1,3 NOX class - 4 Weighted NO Weighted CO mg/kWh 65,5 Type of appliance B11BS Category II2H3+
X
mg/kWh 89
INSTALLERUSER
MAINTENANCE TECHNICIAN
- Flue gas temperature values refer to an air inlet temperature of 15°C.
- e data relevant to domestic hot water perfor­mance refer to a dynamic inlet pressure of 2 bar and an inlet temperature of 15°C; the values are measured directly at the boiler outlet consider­ing that to obtain the data declared mixing with cold water is necessary.
- The maximum sound level emitted during boiler operation is < 55dBA. e sound level value is referred to semianechoic chamber tests with boiler operating at max. heat output, with extension of ue gas exhaust system according to product standards.
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3.19 DATA PLATE KEY.

Md Cod. Md Sr N° CHK Cod. PIN
Type Qnw/Qn min. Qnw/Qn max.
Pn min. Pn max. PMS PMW D TM NOx Class
INSTALLERUSER
Note: the technical data are shown on the boiler data plate
IE
Md Model
Cod. Md Model code
Sr N° Serial Number
CHK Check
Cod. PIN PIN code
Typ e Type of installation (ref. CEN TR 1749)
Qnw min. Minimum heating capacity (domestic)
Qn min. Minimum heating capacity (heating)
Qnw max. Maximum heating capacity (domestic)
Qn max. Maximum heating capacity (heating)
Pn min. Minimum heat output
Pn max. Maximum heat output
PMS Maximum pressure (system)
PMW Maximum pressure (domestic)
D Specic ow rate
TM Maximum working temperature
NOx Class
Nox Class
MAINTENANCE TECHNICIAN
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Immergas S.p.A. 42041 Brescello (RE) - Italy Tel. 0522.689011 Fax 0522.680617
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is instruction booklet is made of ecological paper Cod. 1.038789ENG - rev. ST.002138/000 - 07/15 - Inglese per IRLANDA (IE)
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