COSMOGAS NOVADENS 24, NOVADENS 24B, NOVADENS 24C, NOVADENS 24P, NOVADENS 34 Instruction Manual

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INSTRUCTION MANUAL FOR INSTALLATION

AND MAINTENANCE OF GAS BOILERS

PLEASE READ THE MANUAL CAREFULLY: IT CONTAINS IMPORTANT INFORMATION

REGARDING SAFETY, INSTALLATION, USE AND MAINTENANCE OF THE APPLIANCE

62403425 - R00 07-12-2007_GB-IE

MODELES:

NOVADENS 24 - 24B NOVADENS 24C - 24P NOVADENS 34 - 34B NOVADENS 34C - 34P

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Table of contents

1 - General safety warnings............................................................................................4

1.1 - National installation legislation ..................................................................................................4

2 - GENERAL INFORMATION .......................................................................................5

2.1 - Introduction ............................................................................................................................... 5

2.2 - Description of models ............................................................................................................... 5

2.3 - Manufacturer ............................................................................................................................5

2.4 - Key to symbols used .................................................................................................................5

3 - MAIN COMPONENTS ...............................................................................................6

4 - Functions of the appliance ........................................................................................ 8

4.1 - Intended use and functions of the appliance .........................................................................10

4.2 - Characteristic curves of heating system’s residual head ........................................................ 11

4.3 - Characteristic curve of the domestic side ............................................................................... 11

5 - INSTALLATION ....................................................................................................... 12

5.1 - Opening the packaging ........................................................................................................... 12

5.2 - Dimensions and clearances for installation ............................................................................. 12

5.3 - Choosing the point of installation ............................................................................................ 12

5.4 - Supply and return .................................................................................................................... 13

5.5 - Radiant panel systems (or low temperature systems) ............................................................ 13

5.6 - Domestic hot and cold water ................................................................................................... 13

5.7 - Gas supply .............................................................................................................................. 13

5.8 - Assembling the appliance ....................................................................................................... 14

5.9 - Gas and water connections .................................................................................................... 14

5.10 - Condensation discharge ....................................................................................................... 15

5.11 - Safety relief valve .................................................................................................................. 15

5.12 - Hydraulic connections for boiler with BWR storage tank ...................................................... 16

5.13 - Softener (on request) ............................................................................................................ 16

5.14 - Electrical connections: overview ........................................................................................... 17

5.14.1 - Connecting the power supply cable ........................................................................................17

5.14.2 - Choosing the room thermostat/time-programmable thermostat ..............................................18

5.14.3 - Connecting the room thermostat/time-programmable thermostat ...........................................18

5.14.4 - Installing the outside temperature sensor (on request) ...........................................................18

5.14.5 - CR04 remote time control (optional) .......................................................................................19

5.14.6 - Installation of the CR04 remote time control on the boiler ......................................................19

5.15 - Connecting the boiler to the B70C type water heater (optional) ........................................... 20

5.15.1 - Prevention against Legionnaires disease ...............................................................................20

5.16 - Connecting the boiler to the BWR C type storage tank ....................................................... 21

5.16.1 - Prevention against Legionnaires disease ...............................................................................21

5.17 - Venting systems .................................................................................................................... 22

5.17.1 - “Split 80/80PP” system (polypropylene) ..................................................................................23

5.17.2 - “Split 80/80PP” system: available accessories ......................................................................24

5.17.3 - “Split 80/80PP” system: installation examples ........................................................................25

5.17.4 - “Coaxial 60/100PP” system (polypropylene) ..........................................................................26

5.17.5 - “Coaxial 60/100 PP” system: available accessories ................................................................27

5.17.6 - “Coaxial 60/100PP” system: installation examples ..............................................................28

6 - OPERATING ...........................................................................................................29

6.1 - Operating ................................................................................................................................ 29

6.1.1 - User instructions ........................................................................................................................29

6.1.2 - Filling of the condensation discharge trap .................................................................................29

6.1.3 - Filling the heating system ..........................................................................................................29

6.1.4 - Filling of the secondary heat exchanger of the domestic hot water ..........................................29

6.2 - General warnings concerning gas supply ............................................................................... 29

6.3 - Gas type indicated for the boiler ............................................................................................. 30

6.4 - Converting the boiler from one gas type to another ................................................................ 30

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Table of contents

6.5 - Start-up ................................................................................................................................... 30

6.5.1 - Auto-purging ..............................................................................................................................30

6.6 - Checking and adjusting the gas supply pressure ................................................................... 30

6.7 - Checking the comburant air pressure ..................................................................................... 31

6.8 - Checking and adjusting CO2 levels ........................................................................................ 32

6.9 - Adjusting the heating capacity ................................................................................................ 33

6.10 - Domestic hot water ow rate adjustment .............................................................................. 33

7 - USE ......................................................................................................................... 34

7.1 - Adjusting the domestic hot water ........................................................................................... 34

7.2 - Adjusting the heating system .................................................................................................. 34

7.3 - Thermostatic adjustment ......................................................................................................... 34

7.4 - Climatic adjustment ................................................................................................................. 34

7.4.1 - Climatic adjustment: on which systems? ...................................................................................34

7.4.2 - Climatic adjustment: precautions when making adjustments ....................................................35

7.4.3 - Climatic adjustment: setting of the parameters .........................................................................35

7.4.4 - Climatic adjustment: adjustments of the various climatic zones ...............................................35

7.4.5 - Climatic adjustment: switching on and off the heating service ..................................................35

7.4.6 - Climatic adjustment with room compensation ...........................................................................35

7.5 - Boiler settings (SWITCHES) ................................................................................................... 37

7.6 - Timings of the various functions .............................................................................................. 37

7.7 - Pumps and switch valve blockage protection ......................................................................... 37

7.8 - Anti-freeze protection .............................................................................................................. 37

7.9 - (Empty) ...................................................................................................................................37

7.10 - Energy Saving ....................................................................................................................... 37

7.11 - “Users’ menu” ........................................................................................................................ 38

7.12 - “Installers’ menu” ................................................................................................................... 39

7.13 - Diagnostics ...........................................................................................................................41

7.13.1 - Diagnostics: “L” lock-outs ........................................................................................................42

8 - MAINTENANCE ...................................................................................................... 45

8.1 - General warnings .................................................................................................................... 45

8.2 - Disassembling the casing and accessing internal components .............................................. 45

8.3 - Cleaning of the condensation collecting trap .......................................................................... 46

8.4 - Cleaning the burner and primary heat exchanger (ue gas side) .......................................... 47

8.5 - Correct positioning of the ignition and ionization electrodes .................................................. 47

8.6 - Secondary heat exchanger for the production of d.h.w. .......................................................... 47

8.7 - Replacement of the pump motor ............................................................................................. 48

8.8 - Checking the expansion tank .................................................................................................. 48

8.9 - Dismantling the 3-way valve ................................................................................................... 49

8.10 - Draining the heating side of the appliance ............................................................................ 50

8.11 - Draining the domestic side of the appliance ......................................................................... 50

8.12 - Forcing .................................................................................................................................. 50

8.13 - Auto-purging .......................................................................................................................... 50

8.14 - Fan ........................................................................................................................................ 50

8.15 - Minimum and maximum output ............................................................................................ 50

8.16 - Checking the ionization current ............................................................................................. 50

8.17 - Water temperature gauging sensor ....................................................................................... 51

8.18 - Outside temperature sensor ................................................................................................. 51

8.19 - Functional wiring diagram ..................................................................................................... 52

8.20 - Multiwire wiring diagram ....................................................................................................... 53

9 - TECHNICAL FEATURES ........................................................................................54

10 - EC COMPLIANCE DECLARATION ......................................................................55

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If you smell gas

 Close the gas cock.  Ventilate the room.  Do not use any electrical appliances, telephone

included.

 Immediately call a qualied technician or the gas board

from another room or building. If you cannot contact them, call the Fire Brigade.

If you smell pruducts of the combustion

 Switch off the appliance.  Ventilate the room.  Call a qualied technician.

Installation, modications

The installation, setting and modication of the gas

appliance must be carried out by qualied technicians,

in compliance with local and national norms and these instructions.

Never leave any packaging or replaced parts within

the reach of children.

Seal the setting devices after each setting. It is compulsory to connect the appliance’s discharge

pipe to a chimeney. Failure to observe this rule may seriously risk the safety of individuals and animals.

Flue pipes must not be modied in any way. The user, in accordance with these instructions, must

keep the appliance in satisfactory running order and ensure reliable, safe operating.

The user is responsible for employing a qualified

technician to carry out maintenance work on the appliance in compliance with local and national norms and the matters stated in this manual.

We highly recommend arranging a regular maintenance

contract with a qualied technician

The manufacturer cannot be held responsible for any

damage to people, animals or property caused by incorrect installation or inadequate maintenance.

Use the switches to disconnect the appliance from the

mains before carrying out any cleaning or maintenance operations.

Do not obstruct the intake/discharge pipe ends.

Explosive or easily inammable products

Do not store or use explosive or easily inflammable materials such as paper, solvents, paints, etc..., in the same room as the boiler.

In the event of a breakdown

In the event of breakdown and/or malfunctioning of the appliance, disconnect it, do not attempt to repair it or

intervene in any way whatsoever. Contact a qualied

technician. If repairs require parts to be replaced, only original spares must be used. Failure to observe the above may compromise the appliance’s safety.

Qualied technicians

Qualied technicians are personnel with specic, technical

1 - GENERAL SAFETY WARNINGS

training in the heating system component sector and with regards to domestic hot water production for public use, fuel gas systems and electrical systems. These individuals

must have the legally required qualications.

This booklet forms an integral and essential part of

the product and must be carefully kept by the user, for any future consultation. Ensure that this booklet is handed over to the new owners and/or installer if the appliance should change hands or be moved for any reason whatsoever.

Any optional extras or kit tted subsequently must be

original Cosmogas spares.

This appliance must only be used for the purpose it has

been expressly designed for: heating water for closed circuit systems for centrally heating public and private buildings, producing sanitary and domestic hot water for civil use.

 The man ufacture r cannot be held responsible,

contractually or otherwise, for any damage caused by incorrect installation or use and for failure to comply with the manufacturer’s instructions or applicable local and national legislation.

For safety reasons and to safeguard the environment,

all packaging must be disposed of in special sorted refuge collection centres.

1.1 - National installation legislation

The installation must be carried out by a registered compete nt person and be in accordanc e with the relevant requirements of the current GAS SAFETY (Installation and Use) REGULATIONS, the BUILDING REGULATIONS (Scotland)(Consolidation), the LOCAL BUILDING REGULATIONS, the current I.E.E. WIRING REGULATIONS and the bye laws of the LOCAL WATER

UNDERTAKING. Where no specic instruction is given

reference should be made to the relevant BRITISH STANDARD CODES OF PRACTICE. For Ireland install in accordance with IS 813 “INSTALLATION OF GAS APPLIANCES”.

B.S. Codes of Practice

BS 6891 Gas Installation. BS 5546 Installation of hot water supplies for domestic purposes. BS 5449 Part 1 Forced circulation hot water systems.

BS 6798 Installation of gas red hot water boilers.

BS 5440 Part 1 Flues. BS 5440 Part 2 Ventilation. BS 7074 Expansion vessels and ancillary equipment for sealed water systems. BS 7593 Treatment of water in domestic hot water central heating systems.

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2 - GENERAL INFORMATION

2.1 - Introduction

Congratulations! You have effectively purchased one of the best products on the market. Each single part is built, tested and assembled, with pride, at the COSMOGAS factories, thereby guaranteeing optimum quality control. Thanks to on-going research carried out by COSMOGAS, this product has been conceived and is considered to be the best in

its class with regards to respect for the environment, since it falls within class 5 (less polluting) envisaged by technical norm EN 297 (and EN 483) and has an

elevated efciency, 4 star as per

EC Directive 92/42/CEE. Great importance is also given to the end of the appliance’s useful life. All its components can easily be separated into similar and completely recyclable parts.

2.3 - Manufacturer

COSMOGAS srl Via L. da Vinci 16 47014 - Meldola (FC) ITALY Tel. +39 0543 498383 Fax. +39 0543 498393

www.cosmogas.com info@cosmogas.com

2.4 - Key to symbols used

CAUTION!!!

Risk of electric shock: failure to observe th is war ning may co mpro mise the smooth running of the appliance or cause serious damage to individuals, animals or property.

General danger! Failure to observe this warning may compromise the smooth running of the appliance or cause serious damage to individuals, animals or property.

 Operation symbol

 Important indication symbol

NOVADENS XXYYYY

“ “ =

Boiler with exchanger sanitary to partial accumulation; “A” = Boiler for only heating without integrated pump; “B” = Boiler which can be combined with BWR C series storage tank; “C” = Boiler for only heating with integrated pump; “P” = Boiler with exchanger secondary for D.H.W., to plates; “0834” = Boiler for low temperature central heating systems.

24 = Boiler with maximum input heat of 25 kW 34 = Boiler with maximum input heat of 34.8 kW

Gas-red, condensing, hot water boiler, with sealed combustion chamber

and pre-mix burner, for heating and domestic hot water production.

2.2 - Description of models

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3 - MAIN COMPONENTS

Figure 1 - Internal components of boiler

1 - Automatic air vent

2 - Air intake and ue gas discharge tting (venting system) 3 - NTC7 ue gas sensor

4 - Air drum 5 - Air/gas mixer 6 - Return unit 7 - 3 way valve 8 - NTC2 d.h.w. outlet sensor 9 - 3 way valve shell 10 - Heating pressure switch 11 - Heating circuit discharge cock

12 - Safety relief valve 13 - Control board 14 - Lower cover 15 - Door to control box 16 - Casing 17 - NTC3 d.c.w. sensor 18 - Primary heat exchanger 19 - Ignition cables 20 - Door of sealed combustion chamber

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3 - MAIN COMPONENTS

Figure 1 - Internal components of boiler

21 - Combustion analysis tap 22 - NTC1 boiler temperature sensor 23 - Burner window 24 - Air/gas manifold 25 - NTC6 high temperature limit sensor

26 - Flue gas ow back

prevention valve 27 - Fan 28 - Gas valve 29 - Pressure gauge 30 - Domestic hot water control 31 - Heating control 32 - On/off power switch

33 - Cable clamp 34 - Filling cock 35 - By-pass pipe (optional) 36 - Condensation discharge pipe 37 - Secondary heat exchanger for domestic hot water 38 - Expansion tank connection pipe 39 - Circulator pump 40 - Condensation discharge trap 41 - Expansion tank 42 - Ionization electrode 43 - Burner 44 - Right ignition electrode 45 - Left ignition electrode 46 - Spark generator

47 - Screw cap for unblocking pump 48 - Display 49 - Electric connections board 50 - Opentherm interface board (optional)

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4 - FUNCTIONS OF THE APPLIANCE

Figure 2 - Hydraulic diagram NOVADENS 24 or 24P NOVADENS 34 or 34P

Figure 3 - Hydraulic diagram NOVADENS 24C NOVADENS 34C (for settings, see section 5.5)

Figure 5 - Hydraulic diagram NOVADENS 24 or 24P NOVADENS 34 or 34P connected to B70 type storage tank (for settings, see section 5.15)

Figure 4 - Hydraulic diagram NOVADENS 24B NOVADENS 34B

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Key to gures 2, 3, 4 and 5:

1 = COSMOGAS boiler NOVADENS model 2 = automatic air vent 3 = air intake

4 = ue discharge

5 = sealed combustion chamber 6 = expansion tank 7 = burner 8 = fan 9 = gas valve 10 = condensation discharge trap 11 = circulator pump 12 = 3-way valve 13 = secondary heat exchanger for d.h.w. 14 = pressure gauge 15 = by-pass valve (optional)

16 = lling cock

17 = safety relief valve 18 = gas cock 19 = cold water inlet cock 20 = safety relief valve discharge (optional) 21 = condensation discharge 22 = heating supply pipe 23 = domestic hot water outlet 24 = gas inlet 25 = cold water inlet 26 = heating return pipe 27 = trap funnel (optional)

28 = heating system for radiators or radiant panel-type heating system (to be tted by installer) 29 = domestic hot water system (to be tted by installer)

30 = ------------------

31 = re-circulation supply pipe for water heater loading (to be tted by installer)

32 = B70 type storage tank (optional) 33 = expansion tank 34 = circulator pump 35 = safety rilief valve

36 = re-circulation return pipe for water heater loading (to be tted by installer) 37 = check valve (to be tted by installer) 38 = hydraulic safety unit complying with EN 1487 (to be tted by installer) 39 = water heater lling supply pipe (to be tted by installer) 40 = water heater lling return pipe (to be tted by installer)

41 = BWR type storage tank (optional) 42 = expansion tank 43 = safety relief valve 44 = heating system discharge cock

45 = NTC7 = ue gas sensor

46 = NTC1 = boiler temperature sensor 47 = NTC6 = high temperature limit sensor 48 = NTC3 = domestic cold water sensor/storage tank sensor 49 = NTC2 = domestic hot water outlet sensor

4 - FUNCTIONS OF THE APPLIANCE

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4.1 - Intended use and functions of the appliance

This condensation-type gas appliance, is designed to be used for central heating and producing domestic hot water for civil use. Fit the boiler to the system according to the most suitable residual curve

head (see gures 6 and 7).

The maximum output heat is always guaranteed for the production of domestic hot water since, on each request, the heating service switches off.

Follow the specic procedure in

section 9.13 for the adjustment of the domestic hot water temperature. Depending on the model chosen, the following system types can be created:

A- NOVADENS -- ” “. By means of this boiler, a system can be created for the production of instant domestic hot water and a heating system with heating elements functioning at temperatures ranging between 30°C and 80°C. An example of this type of

system is shown in gure 2.

B- NOVADENS -- “B”. By means of this boiler, a system can be created for the production of domestic hot water using a storage tank, BWR or equivalent model and a heating system with heating elements functioning at temperatures ranging between 30°C and 80°C. An example of this type of

system is shown in gure 4.

C- NOVADENS -- “C”. By means of this boiler, a system can be created for the only heating with heating elements functioning at temperatures ranging between 30°C and 80°C. An example

of this type of system is shown in gure

3. In this model is moreover possible to connect, also after the installation,

en storage tank model BWR lled

up through one external valve to the boiler.

D- NOVADENS -- “P”. By means of this boiler, a system can be created for the production of instant domestic hot water and a heating system with heating elements functioning at temperatures ranging between 30°C and 80°C. An example of this type of

system is shown in gure 2.

All the boiler versions described previously can be connected to a room thermostat for the setting of the heating. Or, so as to improve the quality of the heating service, it is possible to connect an external temperature sensor (Climatic heat adjustment) so as to automatically set the supply temperature in relation to the external temperature; the room thermostat, in this case, can make a compensation of the room temperature. The room compensation can be of an ON /OFF type or twostage. For further information on the Climatic heat adjustment, refer to section 7.4.

For take advantage of the rendering

characteristics of boiler, it is advised to connect it to the CR04 cronothermostat, (see chapter

5.14.5), what it will regulate the temperature of supply to the radiators in continuous and linear way, to maintain the temperature

environment planned.

The boiler must be connected to

a heating system and a domestic hot water supply, with compatible

specications, performance and

power rating.

Before installation, thoroughly ush

the heating and plumbing systems of any residue or impurities which might compromise the smooth running of the boiler.

This boiler is not designed for

outside installation.

Choose a sheltered place where

it is protected from atmospheric elements including frost.

Refer to gure 9 for minimum

clearance distances for installation and future maintenance.

4 - FUNCTIONS OF THE APPLIANCE

E- NOVADENS -- “0834”. By means of this boiler, a system can be created for the production of instant domestic hot water and a heating system with heating elements functioning at temperatures ranging between 20°C and 45°C. An example of this type of

system is shown in gure 2.

F- NOVADENS -- “B0834”. By means of this boiler, a system can be created for the production of domestic hot water using a storage tank, BWR or equivalent model and a heating system with heating elements functioning at temperatures ranging between 20°C and 30°C. An example of this type of

system is shown in gure 4.

G- NOVADENS -- “C0834”. By means of this boiler, a system can be created for the only heating with heating elements functioning at temperatures ranging between 20°C and 45°C. An example of this type of system is

shown in gure 3.

In this model is moreover possible to connect, also after the installation,

en storage tank model BWR lled

up through one external valve to the boiler.

H- NOVADENS -- “P0834”. By means of this boiler, a system can be created for the production of instant domestic hot water and a heating system with heating elements functioning at temperatures ranging between 20°C and 45°C. An example of this type of

system is shown in gure 2.

In all the boiler versions described previously, connection of the domestic hot water service is not indispensable; if the boiler is required solely for central

heating purposes, it is sufcient to connect the cold water pipe so as to ll the heating system and close the tting

of the d.h.w. outlet.

All the NOVADENS -- or NOVADENS

--0834 model boilers, can also be connected subsequently for the installation of a B70 C series storage

tank (see gure 5)

Page 11

4.2 - Characteristic curves of heating system’s residual head

Each standard boiler is tted with its own specic circulator pump. The

residual head at the boiler connections

is shown in graph form in gures 6.

On demande, we can supply the boiler

with a 7 m head pump (see g.7).

The diagram comprises 4 curves which can be selected from the control panel, in the following manner:

 press the button for 12

seconds until parameter is displayed (the display panel will start to blinking);

 continually press and release the

button in order to scroll

through the list of parameters until

the parameter is displayed;

 once the parameter has been

identied, it can be changed using

the or key;

 choose the desired value of the

pump speed;

 Press the button in order to

conrm the modied data and exit

from the menu;

4.3 - Characteristic curve of the domestic side

Every boiler offers certain resistance to the passage of the domestic water

(see graph ow/pressures of gure

8). The installer or the engineer must take account of this in order to ensure

the correct domestic water ow to the

utilities.

Figure 6 - Curve of the pump with 6 metres head

Figure 7 - Curve of the pump with 7 metres head

Figure 8 - Curve of the of pressure for the domestic side.

4 - FUNCTIONS OF THE APPLIANCE

Pressure (bar)

Flow (l/min)

Page 12

5.1 - Opening the packaging

The appliance is supplied in a box. Open it up following the instructions given on

the closing aps.

5.2 - Dimensions and clearances for installation

Leave an area free around the boiler for carrying out installation or maintenance

activities, as shown in gure 9.

5.3 - Choosing the point of installation

CAUTION!!! The boiler must

be installed exclusively on a solid, vertical wall able to bear its weight.

The appliance must be installed indoors, or protected from atmospheric agents including rain, wind, sun and especially frost. When choosing the room and position for installation, account must be taken of the following factors:

- the connection of ue gas discharge/

air intake pipes;

- the connection of gas supply pipe;

- the connection to the water mains;

- connection of the system to the central heating;

- the connection to the domestic hot water system;

- electrical connections;

- the connection of the discharge for condensation produced by the boiler;

- electrical connection to the room thermostat;

- possible connection of the safety relief valve discharge;

- possible connection of the external temperature sensor;

Figure 9 - Minimum clearance distances

1 = 3/4” (models 24) and 1” (models 34) heating supply 2 = 1/2” domestic hot water (absent in NOVADENS B and C models) 3 = 3/4” gas 4 = 1/2” domestic cold water

5 = 3/4” (models 24) and 1” (models 34) heating return 10 = area for power supply cable 11 = BWR supply pipe (present only on NOVADENS B models) 12 = BWR return pipe (present only on NOVADENS B models)

14 = positions available for boiler support

5 - INSTALLATION

Figure 10 - Boiler dimensions and ttings’ distances

Page 13

5.4 - Supply and return

CAUTION!!! This boiler is equipped with a safety relief valve set at 3 bar. Therefore it must not be installed with a radiator positioned at a manometric high higher

than 30 m.

CAUTION!!! COSMOGAS cannot be held responsible for any damage caused by incorrect use of additives in the heating system.

CAUTION!!! The system downstream from the appliance must be made of materials which can withstand temperatures up to 97°C. Otherwise (e.g. plastic piping)

the boiler must be tted with a

device to cut out the pump when it reaches the maximum permitted temperature.

Thoroughly wash out the system, before connecting the heating pipes,

to ush out any deposits (hemp,

radiator casting residue, etc.) which might damage the appliance. Thorough

ushing is also required when

replacing an appliance. Figure 10 illustrates the position of the supply and return pipes.

Install a metallic mesh lter on the

return pipe to prevent any residue from the system returning to the boiler.

Do not use the appliance for adding

any type of additive to the system.

5.5 - Radiant panel systems (or low temperature systems)

CAUTION!!! When the boiler

is installed in a low temperature system, it is indispensable to set the switch 6 in the ON position (see chapter 7.5).

By means of this setting, the boiler will set the temperature towards the supply of a temperature between 20°C and 45°C. No setting operation from the control panel (even by means of the climatic setting) will be able to supply water at a temperature higher than 45°C.

CAUTION!!! If the boiler

is installed in a radiant panel heating system with plastic piping, precautions must be taken against corrosion caused by water oxygenation: check that the system

has plastic piping with a permeability to oxygen of no higher than 0.1 g/m3 at 40°C. If the piping does not comply

with these specications, the radiant

panel circuit must be isolated from the boiler by a plate heat exchanger.

5.6 - Domestic hot and cold water

CAUTION!!! If the water hardness is greater than 25°F, we recommend installing a softener

with lter (see section 5.13).

Figure 10 illustrates the positioning of the domestic hot and cold water pipes. For servicing purposes, install a cutoff cock upstream from the cold water inlet. Connection of the domestic hot water service is not indispensable; if the boiler is required solely for central

heating purposes, it is sufcient to

connect the cold water pipe so as to

ll the heating system and close the

d.h.w. outlet.

5.7 - Gas supply

CAUTION!!! It is forbidden to

use a different gas to that stated for the boiler.

CAUTION!!! Check that the

gas type and the pressure of the gas supplied correspond with those required for the boiler.

There are two possible situations: A - the gas type and the supply pressure match those of the boiler setting. In this case proceed with connections; B - the gas type and the supply pressure do not match those of the boiler setting. In this case, the boiler must be converted to the type of gas and supply pressure available. A special conversion kit is available on request from your salesman or direct from COSMOGAS.

Before installation, we recommend

thorough ushing of the gas supply

pipe.

An on-off cock must be installed on

the gas supply pipe.

To avoid damaging the gas control

unit of the appliance, carry out a leak test at a pressure of no greater than 50 mbar.

If testing of the gas system must

be carried out at a pressure nigher than 50 mbar, use the cock situated immediately upstream from the boiler, to isolate the same from the system.

Figure 10 shows the position of the

appliance gas tting.

The sections of piping making up the gas supply system must always

provide sufcient gas to cover the

required maximum.

5 - INSTALLATION

Page 14

Figure 12 - Gas and water connections

5.8 - Assembling the appliance

Refer to gure 11:

 place the paper template, provided

with the appliance, against the wall;

 ensure that the template is square

with the room;

 mark holes for the wall dowel plugs

and the hydraulic ttings;

 remove the paper template;  drill the holes “A” and insert the wall

dowel plugs “B”;

 carry out the hydraulic and gas

connections for the boiler;

 hang the boiler on the dowel plugs

“C”;

 carry out the hydraulic connections.

5.9 - Gas and water connections

The boiler comes supplied with the

standard ttings illustrated in gure 12,

where:

A = heating supply B = domestic hot water C = gas inlet D = domestic cold water E = gas inlet cock (EN 331 type approved) F = domestic cold water cock G = heating return H = condensation discharge pipe

5 - INSTALLATION

Figure 11 - Support dowel plugs

Page 15

5 - INSTALLATION

Figure 13 - Connection of the discharge safety

valve “A” (pipe “A” is optional) and condensation discharge “B”

Figure 14 - Trap funnel “F” (on request)

5.10 - Condensation discharge

The boiler is equipped internally with a trap for

the evacuation of condensation (see gure 1,

detail 40) and so as to prevent the leakage of combustion products, whose end corresponds

with pipe “B” shown in gure 13. This end

must be conveyed to another smell-control trap

(gure 14, detail “F”) so as to prevent the return

of bad smells in the room (the smell-control trap “F” is supplied upon request). In particular, the condensation disposal system must:

for premises used for dwelling purposes or

ofce purposes with a number of occupants

greater than 10, be connected to the domestic waste disposal system by means of an appropriate trap with separation capable of preventing the pressurization of the system and preventing the return of bad smells

from the sewer (detail “F” of gure 14). If the premises for ofce use has a number of

occupants less than 10, before connection with the domestic waste discharge, it is

advisable to t a condensation neutralizer

(see section 10 for the acidity value of the condensation and the quantity);

be carried out with a pipe with an internal

diameter equal to or greater than 13 mm;

be installed in such a way so as to avoid the

freezing of the liquid, therefore take care with any external stretches; discharge into gutters or rain collectors is forbidden;

present a continual slope towards the point

of discharge; avoid high points, which could place the pipe under pressure;

5.11 - Safety relief valve

The boiler is protected against overpressure, by

a safety relief valve set at 3 bar (see gure 1,

detail 12). The safety relief valve discharge must be

connected to pipe “A” (see gure 13) with a

minimum internal diameter of 13 mm; pipe “A” must then be led to the smell-control trap (detail

“F” of gure 14). This discharge with trap must

provide protection against overpressure in the event of the valve opening and must indicate to the user that this intervention has taken place.

Pipe “A” shown in gure 13 and the smellcontrol trap “F” shown in gure 14 are on

request.

CAUTION!!! If the safety relief valve

is not connected to the discharge, opening of the valve could cause harm to individuals, animals or property.

Page 16

Reference of Figure 17

A = Box tool’s control B = stirrup of block C = toward of opening C = Cover

D = xing screws

E = Cover electrical

connexion board

F = toward of opening “E”

cover

G = Power supply cable (not included) H = Room thermostat cable (not included)

Figure 16 - Softener with lter

5.12 - Hydraulic connections for boiler with BWR storage tank

The NOVADENS -- B or NOVADENS -B0834 model boiler must be connected to a storage tank for the production of domestic hot water.

For this purpose, connection ttings to

the storage tank have been provided for. For the preparation, operate as

follows (refer to gure 15):

 mount pipe “F” to tting “A”;  mount pipe “G” to tting “B”;  mount ttings “C” and “D”

respectively to “F” and “G”; Take care to insert the appropriate gasket in each coupling.

5.13 - Softener (on request)

If the boiler is to be installed in a geographic area where the domestic water hardness exceeds 25°F (250 mg/l), a softener must be installed on the

cold water supply (see gure 16, detail

“B”), so as to safeguard the appliance from any blockage in the domestic water circuit. In order to facilitate installation, a softener may be request to COSMOGAS, with a

specic installation kit.

5 - INSTALLATION

A = BWR return pipe

B = BWR supply pipe

C = BWR return tting D = BWR supply tting

E = gaskets F = service pipe G = service pipe

Figure 15 - Hydraulic connections for boiler with BWR type storage tank

Page 17

5.14 - Electrical connections: overview

CAUTION!!! The appliance

is only electrically safe when it is

correctly connected to an efciently

earthed system, carried out in compliance with current safety standards.

This is an essential safety requirement which must be checked. If in doubt, have the electrical system thoroughly

checked by a qualied technician.

Have a qualied technician

check that the electrical system is adequate for the electric power, indicated on the rating plate, required by the boiler.

The boiler must be connected to the

mains electricity by connection using movable plug. Do not use adapters, multiple plugs or extensions, etc.

The boiler must be connected to

5 - INSTALLATION

the mains electricity by a threepole electrical cable with double insulation and a minimum cross section of 1.5 mm2, resistant to a minimum temperature of 70°C (feature T).

To connect the boiler to the mains

electricity, use a bipolar switch with a contact opening distance of at least 3mm, near to the appliance, in compliance with current standards on the subject.

Respect the polarity between live

and neutral when connecting the boiler.

Ensure that heating and water

piping is not used as earth plates for the electric and telephone systems. This piping is completely unsuitable for this purpose and, in addition, could rapidly lead to serious corrosion damage to the boiler, piping and radiators.

CAUTION!!! The boiler is not provided with any protection against lightening strikes.

5.14.1 - Connecting the power supply cable

To connect the electrical power supply cable, proceed as follows (refer to

gure 17):

 use a three-pole cable with double

insulation and a minimum cross section of 1.5 mm2;

 remove the boiler casing following

the instructions given in section 8.2;

 to rotate the panel "A" toward the

front of the boiler acting on the stirrups "B";

 remove the screw “D” and open the

cover “E”;

 lay the power supply cable “A” as

shown in gure 17;

 strip the cable being careful to leave

the earth wire (yellow green) 20 mm longer than the other two;

 connect the yellow green cable to

the earth terminal (terminals “G”);

 connect the brown cable to terminal

L1 (terminals “G”);

 connect the blue cable to terminal N

(terminals “G”).

CAUTION!!! If the “L1” phase

conductor is inverted with the neutral “N” conductor, the boiler will lock-out, displaying error code E21.

CAUTION!!! If the earthing

system is not efcient,

the boiler will lock-out, displaying error codes L05, E42 or E23 (depending on the entity of the

inefciency).

Figure 17 - Electrical connections

Page 18

5 - INSTALLATION

Figure 18 - Correct positioning of the room thermostat/timeprogrammable thermostat

5.14.2 - Choosing the room thermostat/timeprogrammable thermostat

The boiler is designed to function with any type of room or timeprogrammable thermostat which has contacts for the boiler cable connections, and the following features:

- open/closed (ON/OFF);

- clean (not powered);

- closed when heating is required;

- electrical specications 24Vac, 1A.

5.14.3 - Connecting the room thermostat/timeprogrammable thermostat

Install the room thermostat in a part of the house where the temperature is as near to average as possible and in any event not an area subject to sudden temperature changes, away from outside windows or doors (see

gure 18).

To connect the room thermostat cable,

proceed as follows (refer to gure 17):

 use a bipolar cable with a minimum

cross section of 1.5 mm2 which leads from the boiler to the room thermostat/time-programmable thermostat;

 remove the boiler casing according

to the instructions given in section

8.2;

 lay the electrical cable “H” exactly as

shown in gure 17;

 get the cable to pass via a free cable

clamp, not used by other wires;

 connect the 2 ends of the cable to

the “TA” terminals (see gure 17,

detail “M”).

CAUTION!!!

Si n c e t h e cabl e s of t he r o om the r m o st a t/ t im e - pr o gr a mm a bl e thermostat are subject to low safety voltage (24Vcc), they must run through ducts different from the 230Vac power supply cables.

5.14.4 - Installing the outside temperature sensor (on request)

Install the outside temperature sensor outside the house, on a wall facing NORTH or NORTH-EST, at a height of between 2 and 2.5 metres from the

ground; on buildings with several oors,

install near the upper half of the second

oor. Do not install the sensor above

doors, windows or ventilation outlets nor directly under balconies or gutter pipes Do not plaster the external temperature sensor. Do not install the sensor on walls without overhangs, or not protected from rain. If the sensor is installed on a wall still to be plastered, it is necessary to install it with an adequate shim or remove it before plastering.

To connect the cable of the outside temp e r a t ur e s e ns o r, p r o c e ed a s follows:  lay a bipolar electrical cable with a

minimum section of 1.5mm2 which leads from the boiler to the external temperature sensor. The maximum length permitted is 20 m. For longer lengths, up to 100 m, it is necessary to use a shielded cable with an earthed shield;

CAUTION!!!

Since the cables are subject to low safety voltage (24Vcc), they must run through ducts different from the 230Vac power supply cables.

 connect the bipolar cable to

terminals SE as shown in gure 17,

detail “F”;

 connect the bipolar cable to the ends

of the external temperature sensor. Set the boiler so that it detects the outside temperature sensor, as follows:

 press down the button for 12

seconds until the display blinking and

shows ;  then press and release the button

several times until the following

parameter appears ;

 using the and keys,

change the parameter value

from 00 to 01 or 02 in relation to

the type of climatic heat adjustment

desired (see section 7.4);

 press the button repeatedly

until exiting the menu; the display will

no longer ash.

Page 19

5 - INSTALLATION

5.14.5 - CR04 remote time control (optional)

The CR04 time control is a room thermostat capable of interacting with the boiler, adjusting the room temperature in a modulating manner and not by steps. This device is really a genuine heat regulator capable of operating, or otherwise, with the outside temperature sensor and therefore of adjusting the room temperature in an optimum manner. If the boiler has been factory purchased

without this device, it is rst of all necessary to t an “Opentherm”

interface board as described in the following section. If the boiler has been purchased inclusive of the remote control, it means that the “Opentherm” board has already been installed on the boiler and it is only necessary to install the remote control as follows: Install the CR04 remote control in a point of the building where the temperature is as close to that characteristic of the house and in any event in an area not subject to sudden temperature changes, far away from windows and doors which directly

connect with outdoors (see gure 18).

In order to connect the room thermostat cable, proceed as follows

(refer to gure 17):

 use a bipolar cable with a minimum

cross section of 1.5 mm2 which leads from the boiler to the CR04 remote control. The cable must also be protected by means of the earthing of the protection and the maximum length permitted is 100 metres;

 dismantle the casing and access the

electrical terminal board, following

the specic instructions in section

8.2;

 connect the 2 ends of the cable to

the “OT” terminals of the boiler (see

gure 17).

 connect the other 2 ends of the

cable to the terminals of the remote control (follow the instructions on the remote control).

CAUTION !!!

Since the cables of the remote control are subject to extremely low security voltage (24Vcc), they must pass through ducts differen t from the 230Vac supply cables.

Once the remote control has been connected, all the room temperature adjustmen ts and domestic water tempe rat ure operati ons must be carried out directly on the same. Accordingly, remember to closely follow the instructions contained on the CR04 remote control.

5.14.6 - Installation of the CR04 remote time control on the boiler

If the boiler has been purchased with the CR04-type time control, in order to enable the same it is necessary to install the “Opentherm” interface board on the boiler following the instructions contained on the remote control.

Page 20

5.15 - Connecting the boiler to the B70C type water heater (optional)

The boiler can be immediately or subsequently connected to a B70C type storage tank manufactured by Cosmogas. The water connection must be carried

out as per gure 19.

For the electrical connection, proceed

as follows (refer to gure 21):

 disconnect the electricity supply to

the boiler;

 access the internal components and

the electrical components of the boiler,

following the specic section 8.2;

 move the switch 1 to position “B”

(ON);

 Remove the cable from the sonde “17”

of gure 1;

 lay the bipolar cable with a minimum

1.5mm2 section which goes from the boiler to the temperature sensor of the water heater and connect it on the boiler to terminals “15” and “16” (SB);

Figure 19 - Hydraulic connection to B70C storage tank type

1 COSMOGAS boiler 2 B70C type storage tank (on request) 3 Gas supply

4 d.h.w. supply to water heater (to

be tted by the installer)

5 d.h.w. outlet

6 Cold water 7 Safety relief valve

9 Check valve (to be tted by

installer) 10 Recirculation for storage tank loading (to be tted by installer)

11 Storage tank loading pump 12 Temperature sensor

13 Hydraulic safety unit (to be tted

by installer)

14 Heating supply 15 Heating return

5 - INSTALLATION

 connect the other end of the cable to

the temperature sensor of the water

heater;  insert the probe of the temperature

sensor into the socket “12” as shown

in gure 19.

CAUTION!!! Since the cables

are subject to low safety voltage

(24Vcc), they must run through

ducts different from the 230Vac

pump power supply cable.

 connect a three-pole double insulated

electrical cable (Live, Neutral and

Earth), with a minimum cross section

of 1.5m m2 which is resis tant to

a minimum tempera ture of 70°C

(feature T) to terminals “3” and “5” and

to the earth connection, and connect

the other end of the cable directly to

the pump of the storage tank (see

gure 19, detail “11”);

5.15.1 - Prevention against Legionnaires disease

If the boiler is connected to a storage tank for the preparation of domestic hot water, a disinfection cycle is envisaged against Legionnaires bacteria. This cycle anticipates taking the storage tank to a temperature of 60°C (temperature at which said bacteria die) at least once a week. Therefore, the water (at certain times) may reach the user at a higher temperature than

that set on the knob on the specic

control.

The rst time the boiler is started up,

the anti-Legionnaires cycle is also started after 2 hours of running.

Page 21

5.16 - Connecting the boiler to the BWR C type storage tank

Only the NOVADENS -- B and NOVADENS -- B0834 model boilers can be connected to a BWR type storage tank.

The water connection must be carried

out as per gure 20.

For the electrical connection, proceed as

follows (refer to gure 21):

 disconnect the electricity supply to the

boiler;

 access the internal components and

the electrical components of the boiler,

following the specic section 8.2;

 move switch 1 to position “B” (ON);  Remove the cable from the sonde “17”

of gure 1;

 lay the bipolar cable with a minimum

1.5mm2 section which goes from the boiler to the temperature sensor of the storage tank and connect it on the boiler to terminals “15” and “16” (SB);

 connect the other end of the cable to

the temperature sensor of the storage tank;

 insert the probe of the temperature

sensor into the socket of the storage

tank (see gure 20, detail 14).

5.16.1 - Prevention against Legionnaires disease

See chapter 5.15.1.

Figure 20 - hydraulic connection to BWR C type storage

tank

1 COSMOGAS boiler 2 3 4 Gas supply 5 6 Connection for lling the heating

system (to be carried out by the installer) 7 BWR C type storage tank

8 Domestic hot water outlet

9 Cold water inlet 10 Supply and return for storage tank loading 11 Hydraulic safety unit (to be tted

by installer) 12 Supply pipe to heating system 13 Retur n pipe from heat i n g system 14 Temperature sensor socket

Figure 21 - Electrical connection to a B70C or BWR C type water heater

5 - INSTALLATION

Page 22

5 - INSTALLATION

5.17 - Venting systems

CAUTION!!! All venting systems must be connected in compliance with current national and local standards.

CAUTION!!! Under determinate conditions, the temperature of the

appliance’s ue gases may reach 110°C.

Therefore, use plastic piping capable of resisting this temperature.

CAUTION!!! This is a “condensation-type” appliance. In order

to create the ue gas discharge, use

materials in AISI 316L stainless steel or plastic materials in polypropylene, so as to avoid corrosion due to the acidity of the condensation.

Remember that this type of appliance must have discharge and intake pipes supplied by the appliance manufacturer. Any other types of pipe must be approved.

The approved types of ue gas discharge

system are given in the table of technical features at the end of the manual, under the heading “type”, and on the boiler rating plate, again under the heading “type”. The symbols

used to dene the type of discharge system are as follows(see also g.22):

- C13, coaxial through vertical wall;

- C33, coaxial through the roof;

- C43, separate with discharge in the chimney, intake through another same channel;

- C53, separate discharge through roof and intake through wall, or in two places with potentially different pressure;

- C63, the boiler can be tted to approved

intake and discharge pipes of another manufacturer;

- C83, separate with intake through the wall, or another point, independent of venting for other appliances, with discharge into the

chimney ue.

During operation, especially in Winter,

again due to high efciency, the boiler may

discharge white smoke. This is a purely natural phenomenon and not a reason for concern, as it is steam from the gas fumes condensing on contact with the outside air.

Figure 22 - Approved discharge/intake systems

Page 23

5.17.1 - “Split 80/80PP” system (polypropylene)

The standard appliance is not supplied with

ttings for connecting ue gas discharge outlets/

air intakes. A special kit is available on request for connecting the boiler to the “split 80/80PP

system”, to be installed following gure 23.

Fitting “A” can freely turn 360 degrees, thereby guaranteeing optimum installation versatility.

It is advisable to install AISI 316L type

stainless steel pipes or polypropylene pipes

on the ue gas discharge side, which are more

resistant to the formation of condensation.

Take particular care when installing piping

through a wall to the outside; install the pipes in sheathing so that they can be easily slipped out for access during routine maintenance.

Horizontal sections must always be pitched by

at least 2% towards the condensation drainage system.



The boiler comes supplied with a condensation

collector which must be tted to a discharge

pipe (see

section 5.10).

CAUTION!!! This condensation drainage system is designed to empty all the liquid produced by one single appliance. If installing more than one boiler, each must be equipped with its own drainage system.

The ue gas discharge/air intake systems can

be extended up to the maximum distance given in section 9 at the end of the manual. Each 90° elbow has an equivalent loss of 1 metre of straight pipe. Each 45° elbow has an equivalent loss of 0.5 m of straight pipe.

CAUTION!!! Mechanically secure the

joints between the different components of

the ue gas discharge and intake pipes with xing screws or equivalent systems. See gure 25.

CAUTION!!! During operation, the temperature of the discharge pipe can exceed 110°C. Insert protective heat insulating sheathing if it has to pass through walls which are vulnerable to such temperatures.

CAUTION!!! Leave a minimum gap of

1 metre between the air intake and ue gas

discharge terminals if they are located on the same wall.

Figure 25 - Fixing the ue gas discharge and air intake

pipes

5 - INSTALLATION

Figure 23 - Installation of “split 80/80 PP” system

Figure 24 - Dimensions

Page 24

5 - INSTALLATION

5.17.2 - “Split 80/80PP” system: available accessories

Some of the most commonly used accessories for

installing the split system of ue gas discharge/air intake

80/80PP are listed below; a much wider range however can be found in the special catalogue: (the number after the code refers to the part in the following drawings) 62617053 - No. 9 chimney cap draft damper for the roof 62617244 - No. 12 90° elbow M/F in PP

62617255 - No. 29 ashing for roofs pitched between

15° and 25° 62617236 - No. 11 extension M/F in PP 62617248 - No. 18 anti-extraction clamp for PP extensions

62617240 - No. 14 exible M/F pipe in PP L=20m 62617241 - No. 16 spacer for exible pipe

62617238 - No. 17 telescopic joint in PP

62617242 - No. 15 T tting in PP

Page 25

5 - INSTALLATION

5.17.3 - “Split 80/80PP” system: installation examples

Two installation examples can be seen

in gure 26:

- discharge into chimney with collection of condensation at base of the chimney. The hor izontal part of the flue gas discharge side must be pitched towards the “T” with condensation collection. The intake must be pitched outward to prevent rainwater entering.

- discharge directly outside with the pipes of the boiler with collection of condensation inside the boiler itself. The intake must be pitched outward to prevent rainwater entering.

A separate type flue gas discharge

example can be seen in gure 27 where the discharge of the ue gases is carried out with plastic exible pipes, for piping

of technical pits. All the condensation produced in the vertical pipe is conveyed inside the boiler The intake must be pitched outward to prevent rainwater entering.

Figure 26 - Installation example “Split 80/80 PP” system

Figure 27 - Installation example “Split 80/80 PP” system

Page 26

5.17.4 - “Coaxial 60/100PP” system (polypropylene)

The standard appliance is not

supplied with ttings for connecting ue gas discharge outlets/air intakes.

A special kit is available on request for connecting the boiler to a “coaxial 60/100PP” system, to be installed as

shown in gure 28, where the vertical

discharge is shown on the left under letter “A” and the horizontal discharge on the right under letter “B”:

CAUTION!!! Scrupulously

follow the installation steps for the

coaxial pipe as illustrated in gure 26.

In particular, it is necessary to

 insert the coaxial pipe “C” inside elbow

“A”;

 secure the outer pipe with stainless

steel self-tapping screws “B”.

CAUTION!!! After the above operations, check that the end of the discharge/intake faces outwards

with the tolerances shown in gure

31.

Take particular care when installing

piping through a wall to the outside; install the piping in sheathing so that it can be easily slipped out for access during routine maintenance.

Horizontal sections must always be

pitched by at least 2% towards the boiler.

The ue gas discharge/air intake pipe

can be extended up to the maximum distance given in the table in section 9 at the end of the manual.

5 - INSTALLATION

Figure 28 - Installation of the vertical coaxial system (A) or the horizontal coaxial system (B)

Figure 29 - Pre-installation gures and distances between

holes for coaxial discharge system

Figure 30 - Positioning of the coaxial pipe

Page 27

5 - INSTALLATION

5.17.5 - “Coaxial 60/100 PP” system: available accessories

The following accessories are available, on request,

for installing the ue gas discharge/air intake system

60/100: (the number after the code refers to the part in the following drawings)

62617255 - No. 2 ashing for roofs pitched between

15° and 25° 62617234 - No. 1 Coaxial elbow 90° M/F PP 62617252 - No. 6 Coaxial elbow 45° M/F PP 62617231 - No. 7 Coaxial extension L 1m PP 62617250 - No. 3 Coaxial roof end piece PP 62617232 - No. 5 Coaxial wall end piece PP

Page 28

5 - INSTALLATION

5.17.6 - “Coaxial 60/100PP” system: installation examples

When a coaxial discharge is installed

(see gure 31), whether it is vertical or

horizontal, it is indispensable to slope the discharge pipe upwards so as to get the

condensation to ow inside the boiler.

Figure 31 - Installation examples for the coaxial pipe

Page 29

6.1 - Operating

Before starting the appliance up, it is necessary to carry out the following.

6 . 1 . 1 - U s e r instructions

The user must be correctly instructed on how to operate the appliance, in particular:

Make sure that the user has the

instruction and users’ manual and all other documentation included in the packaging.

Make sure the user is informed of

all the special measures to be taken

for discharging ue gases, and that these must not be modied.

Inform the user with regards to

adjusting the water pressure in the system and all necessary measures

for lling and bleeding air.

Correctly inform the user on how to

adjust temperatures, controls/room thermostats and radiators to save energy.

6.1. 2 - F illi n g o f the condensation discharge trap

The trap is positioned inside the boiler

(see gure 1, detail 40), and must be lled with water in order to create the

head capable of avoiding the leakage of

the ue gases from the pipe “36” of gure

1. Proceed as follows for this purpose:

 disconnect the ue gas discharge

tting from opening “2” as per gure

6 - OPERATING

 remove the tube previously

connected and check that there are no water leakages.

6.2 - General warnings c o n c e r n i n g g a s supply

When starting up the boiler for the rst time, have qualied technicians check

the following:

That the boiler is powered by the

type of fuel it is designed to use.

That the gas supply pressure (with

boiler on and boiler off) is within the maximum and minimum values given in the table in section 9 at the end of the manual.

That the gas supply system is

provided with all the safety devices and controls required under current national and local legislation.

That the ue gas discharge terminal

and the air intake terminal are free from any blockages.

That the condensation discharge

connection is connected.

CAUTION !!! If you smell

gas:

A - Do not use any electrical

appliance, including telephones or any object which might cause sparks;

B - Immediately open doors and

windows to produce a current of air to rapidly clear all gas from the room;

C - Immediately call, from

another room or from a

neighbour’s house, a qualied

technician or the gas board. If you cannot contact them, call the Fire Brigade.

Figure 32 - Bleed screws of the secondary heat exchanger

 from the central opening (ue

gas discharge), slowly pour in approximately 100 cm3 (a glass full) of water;

 re-connect the ue gas discharge

tting;

6.1.3 - Filling the heating system

If at the time of switching on the power to the boiler, FILL appears on the display, it means that it is necessary

to ll the heating system. Proceed as

follows:

The heating system must only be

lled with clean water from the mains

supply.

CAUTION!!! The addition of any chemical substance, such as anti-freeze, must be carried out according to the product instructions. These substances must never be inserted directly into the boiler.

 Open the automatic air vent a

couple of turns (see gure 1, detail

“1”) situated at the top of the boiler.

 Open the supply cock located under

the boiler (see gure 1, detail “34”) and proceed to ll the system and

appliance to about 1.5 bar (FILL disappears from the display).

 Check that there is no water leaking

from the ttings.

 Close the supply cock (see gure 1,

detail “34”);

 Purging the air from the radiators.  Check the pressure gauge reading

of the boiler once again. If it has

dropped, re-ll again until its reads

1.5 bar

6.1.4 - Filling of the secondary heat exchanger of the domestic hot water

Once the heating circuit has been lled, it is also necessary to carry out the lling of

the secondary heat exchanger. Proceed as follows:  connect a rubber tube to the

pressure coupling “A” shown in

gure 32 and take it to the discharge

of a sink or similar;

 loosen screw “A” as shown in gure

32 until you hear the air escape and wait until just water runs out;

 tighten screw “A” once again as

shown in gure 32;

Page 30

Figure 33 - Gas valve

C - Service pressure probe D - Gas inlet pressure probe E - CO2 adjusting screws

6.3 - Gas type indicated for the boiler

On the front of the boiler there is a label indicating the type and supply pressure of gas to be used for the boiler. The boiler can have one of the following two labels:

2H-G20-20mbar NATURAL GAS

means that the appliance should be used with gas type H of the second family (natural gas), at a supply pressure of 20 mbar.

3P-G31-30mbar L.P. Gas

means that the appliance should be used with gas type P (Propane also known as L.P.Gas) of the third family,

at a xed supply pressure of 30 mbar

6.4 - Converting the boiler from one gas type to another

Conversion of the appliance to use another type of gas must be carried out

by a qualied technician.

If the gas available is not of the type to be used with the appliance, it must be converted. Special conversion kits are available for this purpose.

6.5 - Start-up

 Open the gas cock.  Swit ch on el ectri c powe r to the

boiler.

 If the display shows code E 21, it

means that the polarity has not been observed between phase and neutral. Therefore it is necessary to rotate them.

 Upon start-up, an F is shown for 2

minutes during which the purging of the plant takes place. If you wish to by-pass this stage, just press the keys + and - together until a blinking F appears. Then press the RESET button.

 Rotate the controls “30” and “31”

shown in figure 1 to the desired temperature.

 The heating service will only start up

when the room thermostat calls for heating. If an external temperature sensor is connected, check that the temperature calculated is higher than

the minimum running temperature (see section 7.4).

 If the pump indicator is illuminated but

the pump (see gure 1 detail “39”) is

not running, try releasing it using the special screw (remove the screw “47”

shown in gure 1 and turn the screw

underneath).

 If the pump indicator is illuminated but

the radiators do not heat up, repeat air bleeding operations on both the boiler and the radiators.

6.5.1 - Auto-purging

Each time the power supply to the appliance is switched on, a procedure for the auto-purging of the air in the plant commences, lasting 2 minutes. The procedure involves the switching on and off of the pump in order to facilitate the evacuation of the air. Before starting the procedure up, ensure that you have opened the automatic air vent (detail “1”

of gure 1).

6.6 - Checking and adjusting the gas supply pressure

The gas supply pressure must match that given in the table in section 9 at the end of this manual. Check as follows:

 close the gas cock;  access the internal components of

the boiler following the procedure in section 8.2;

 loosen the pressure connection “D”

(see gure 33);

 connect a pressure gauge with a

denition of at least 0.1 mbar (1

mmH2O);

 open the gas cock;  check that the pressure does not

exceed the value given in the table in section 9 at the end of the manual under the heading “Maximum gas supply pressure;

 switch on the boiler and generate

a heating request (turn control “31”

shown in gure 1 to maximum) and

ensure that the room thermostat calls for heating;

 press together the and

keys for more than 10 seconds, the

display will show ;

 press the key until the display

shows . Now the boiler will run for 10 minutes at maximum power;

 check that the pressure does not

drop below the values given under “Minimum gas supply pressures” in

6 - OPERATING

the table in section 9 at the end of the manual.

If the supply pressure does not fall within the above values, operate upstream of the appliance to bring the pressure within the maximum and minimum range given in the table.

At the end of the check, close the pressure connection “D” and checking for any gas leaks.

Page 31

Figure 34 - Comburant air pressure probes

Figure 35 - Checking the comburant

air pressure

6.7 - Checking the comburant air pressure

Since the boiler has a factory-set air/ gas ratio, the pressure of the gas at the burner is controlled indirectly; the comburant air pressure is checked inside the boiler and must correspond with that shown in the table in section 9 under the item “Comburant air pressure” To carry out the check, proceed as

follows (refer to gures 34 and 35):

 use a differential pressure gauge with

a precision of at least 0.1 mbar (1 mmH2O);

 close the gas cock;  open the boiler casing following

section 8.2;

 remove plug “B”;  loosen the screw of the pressure

probe “C”;

 insert a tube “F” which goes from the

pressure gauge, passing through the opening of the plug “B”, to the

pressure probe “C” (as in gure 35);

 remove the plug “A” from the pressure

probe and connect the differential pressure gauge;

 the connection must be carried out as

in gure 35, scrupulously observing

the polarity of the pressure, shown on the pressure gauge;

 close up the casing “L” as per

gure 40. It is indispensable to have

a reliable measurement;

 switch on the boiler;

 press keys and together

for more than 10 seconds, until is displayed;

 now the fan is forced to maximum

power, with the burner off, for 10 minutes;

 compare the pressure value on the

pressure gauge with the table in section 9, “Comburant air pressure”;

 if the pressure is at a lower value,

check that there are no obstructions in

the comburant air/ue gas discharge

circuit;

 press the key to return the boiler

to normal running conditions;

 once the check has been carried

out, reassemble everything as it was originally.

6 - OPERATING

Page 32

Figure 36 - Combustion

analysis probes

Figure 37 - Domestic hot

water ow selector switch

6 - OPERATING

6.8 - Checking and adjusting CO2 levels

The levels of CO2 (carbon dioxide) in the boiler, under normal operating conditions, and below an altitude of 1,000m, are given in the table in section

9. Different values to those given may lead to malfunctioning. In order to check this value, carry out an analysis of the combustion. Proceed as follows:  connect a combustion analyser

to the special connection on the

discharge tting “B” of gure 36;

 generate a heating request or, if this

is not possible, fully open a domestic hot water tap ;

 press together the and

keys for more than 10 seconds, the

display will show ;

 press the key until the display

shows (if there is a heating

request) or until is displayed if a domestic hot water request has

been generated. Now the boiler will run for 10 minutes at maximum power.

 wait until the level of CO2 stabilizes;  compare the reading with that given

in the table in section 9, headed

“CO2 levels”. If the reading differs from that in the table, it must be brought within the range of the values given in the table in section

9. Proceed as follows:  use a screwdriver on screw “E” (see

gure 33;

 turn clockwise in order to reduce the

level of CO2. Turn counter-clockwise

in order to increase the level of CO2;

 press the key until the display

shows , or if tested in

domestic mode. Now the boiler will

work for 10 minutes at minimum

power;  Check the CO2 value; it must drop

by 0.5% with respect to the value

obtained at maximum power.

Otherwise, use screw “F” in gure

33 to correct the CO2 value (turn in

a clock-wise direction to increase,

turn in a counter-clockwise direction

to decrease )  Once again check the CO2 at

maximum power and if necessary

carry out a further adjustment.

 Once nished, seal the screws “E” and

“F” as in gure 33 with red paint or a

similar system;

 press the

button to return the boiler to normal operatin g conditions.

CAUTION!!! During this phase, if the power supplied to the boiler is much higher than the power absorbed by the system, the boiler will switch off in continuation in order to reach the maximum temperature permitted (45°C for low temperature systems, 85°C for

radiator systems), or the ue gas safety

thermostat intervenes, and the boiler will show block L06. This could also occur in the event that domestic water analysis is carried out, if the domestic water pressure is low or the temperature of the domestic cold water is very high. In order to avoid this inconvenience, it is necessary to set the heating output, to the effective needs of the system, as indicated in the following section and analyze the CO2 or the combustion

efciency, setting the forcing mentioned

previously at t- (letter “t” with dash in middle) or S- (letter “S” with dash in middle) for domestic water.

Page 33

6.9 - Adjusting the heating capacity

The boiler has been constructed with

an “intelligent” conception of the adjustment of the output heating, in relation to the effective requirement of the system, therefore it does not need adjusting. However, during the bringing onto stream of the system, the boiler runs for a brief period at its maximum power. If one wishes to limit the maximum power to the effective maximum load necessary

for the system, just operate on the parameter found on the installers menu (see section 7.12).

The

parameter can be adjusted between 1 and 100, corresponding respe c t i v e l y to the mi n i m u m and maximum output . Read the correct parameter on the table on the left.

6 . 1 0 - D ome s t i c hot water flow rate adjustment

The quantity of domestic hot water which can be produced from the boiler depends on the pressure of the hydraulic circuit. If the pressure is high, the water will move too quickly around the circuit without being heated. It is therefore advisable to carry out the following adjustments:

 switch on the boiler;  adjust control “30” as shown in gure

1 at 48 - 50 °C;

 fully open a hot water cock. In the

event of a mixer cock with single lever, the position must be on HOT;

 wait 5 minutes for the temperature to

stabilize;

 if the water temperature is too low,

reduce the water ow using the ow selector “A” (see gure 37) until

reaching the desired temperature.

Water ow should generally be

regulated according to the values given in section 9, under the heading “instant d.h.w. production dt 30°C”.

6 - OPERATING

Tabella per la regolazione della potenza in riscaldamento

BOILER MODEL

Necessary

power (kW)

Page 34

7 - USE

7.1 - Adjusting the domestic hot water

The adjustment of the domestic hot water temperature (when present) is carried out by turning the control “30” shown in

gure 1. When the control is touched, the display “48” shown in gure 1 shows a

blinking

and the temperature which

is being set is shown. The setting eld

within which the domestic hot water can be set ranges from 45°C to 70°C.

7.2 - Adjusting the heating system

By means of the para meter present in the “Installers’ Menu” (see section 7.12) it is possible to select the various functioning modes of the heating service:

- CH = 00 “Thermostatic adjustment”: the heating supply temperature is adjusted

manually, using control “31” as per gure

1. The opening and closing of the room thermostat correspondingly shuts down or starts up the boiler pump so as to carry out the adjustment of the room temperature;

- CH = 01 “Cli m a t ic ad j ustment” : th e heat ing supply temp erat ure is adjusted automatically by the outside temperature sensor according to an

algorithm corresponding to gures 38

and 39. The opening and closing of the room thermostat correspondingly shuts down or starts up the boiler pump. When the “Calculated temperature” drops below the “Minimum heating temperature”, the heating service ends. It automatically starts up when the “Calculated temperature” once again ri ses above the “Mini mum heating temperature”;

- CH = 02 “Climatic adjustment with room compensation”: the heating supply temperature is adjusted automatically by the outside temperatu re sensor according to an algorithm corresponding

to gures 38 and 39. The opening of the

room thermostat reduces the heating supply temperature by a set value. The boiler pump always remains working. When the “Calculated temperature” drops below the “Minimum heating temperature”, the heating service ends. It automatically starts up once again when the “Calculated temperature” once again rises above the “Minimum heating temperature”.

7.3 - Thermostatic adjustment

At the factory, the boiler is set with the

parameter at 00, or rather the boiler provides hot water to the heating system, at a set temperature, set on control “31” as per figure 1. A room thermostat, if installed, acts directly on the internal pump of the boiler in order to adjust the heating of the rooms. In order to fully exploit the boiler’s performances, it is advisable to set the temperature on control “31” at a value

which is just sufcient so as to obtain

the desired temperature of the rooms. If the season gets colder, progressively increase the value of the temperature set “31”. Proceed in the opposite manner, when the season gets milder. Th i s extre mely si mple fu n ction ing method, is suitable for the following types of system:

- small systems, with radiators, and with a room whose temperature is characteristic of all the other rooms;

- large systems, with radiators, where each zone is controlled by its own room thermostat and the boiler pump is shutdown only when all the room thermostats are satisfied (see to an appropriate electrical system).

- large systems with radiant panels (low temperature), where each zone is controlled by its own room thermostat and the boiler pump is shutdown only when all the room thermostats are

satised (see to an appropriate electrical

system).

CAUTION!!! If the appliance

is installed in a low temperature system, it is indispensable to follow the settings indicated in section 5.6.

7 . 4 - C l i m a t i c adjustment

Via the “Installers’ Menu”, set parameter

at 01. The heating su p p l y temperature is adjusted automatically by the outside temperature sensor. The relationship existing between the outside temperature and the supply temperature, corresponds with the line illustrated in the diagrams shown in

gures 30 and 31. In order to adjust this

line to the various dwellings/climatic conditions, it is necessary to set all the adjustment parameters, according to the subsequent sections.

7 . 4 . 1 - C l i m a t i c adjustment: on which systems?

The “Climatic adjustment” is a more sophisticated and subtle setting of the “thermostatic adjustment” and it is able to use the performance of the boiler better and is suitable for the following types of systems:

- small systems, with radiators, and with a room whose temperature is characteristic of all the other rooms. The room thermostat takes steps to make opportune corrections to the room temperature, switching the boiler pump on and off.

- small systems, with radiant panels (low temperature), with a room whose temperature is characteristic of all the other rooms. The room thermostat takes steps to make opportune corrections to the room temperature, switching the boiler pump on and off. In the event of use of the time-programmable thermostat, it is necessary to consider that the radiant panel systems have an extremely high thermal inertia, therefore it is necessary to adapt any advances of the start up of the heating by also

using the “Reaction” parameter in order to speed up any “full operations” situation.

- Iarge systems with radiant panels (low temperature), where each zone is controlled by its own room thermostat and the boiler pump is shutdown only when all the room thermostats are

satised (see to an appropriate electrical

system).

CAUTION!!! If the appliance

is installed in a low temperatur e system, it is indispensable to follow the setting in section 5.6.

Page 35

7 - USE

7 . 4 . 2 - C l i m a t i c a d j u s t m e n t : precautions when making adjustments

In order to carry out the correct automatic setting of the supply temperature, it is advisable to immediately set the values suggested further on, for the setting of the line of figures 30 and

31.Subsequently if these values do not provide a satisfactory result, proceed with the appropriate adjustments bearing in mind that:

- each parameter must be set in small degrees;

- after each change, wait at least 24 hours in order to see the result;

- the nearer the adjustment line draws to the real needs of the building, the more the heating of the building will be comfortable and the energy saving high;

- by means of control “31” in gure 1,

it is however possible to carry out the

small corrections “b” shown in gures

30 and 31, that is shift the parallelism of the line more or less in stages of 1 °C, up to 10°C.

7 . 4 . 3 - C l i m a t i c adjustment: setting of the parameters

By means of the user menu (see section

7.10), set:

- = “The angle of the line”, which can be adjusted between 0.1 and 5.0. The suggested starting values are: 0.6 for “low temperature” systems; 1.6 for high temperature systems;

- = “Minimum heating temperature”, which can be adjusted between 20°C and 60°C. The suggested starting values are: 30°C for “low temperature” systems; 40°C for “high temperature” systems;

- =“Maximum heating temperature” which can be adjusted between 30°C an d 80° C. The suggested start ing values are: 45°C for “low temperature” systems”; 80°C for “high temperature” systems.

By means of the installer menu (see section 7.11), set:

- = “Reaction ” of the sup ply temperature with respect to the external temperature changes, which can be adjusted between 1°C and 10°C. A low “Reaction” value makes it possible to have a constant temperature of the dwelling but slow with regards reaching

full running conditions and in its response to the external temperature changes. A high “Reaction” value guarantees the speed of reaching full running conditions, but also possible oscillations in the temperature inside the dwelling. You are advised to maintain this value between 1 and 2;

= “Fix point” is the heating supply temperature, when the external temperature is 20°C. It is called “Fix Point” because it is also the angle fulcrum of the line. The suggested starting values are: 33°C for “low temperature” systems 50°C for “high temperature” systems.

7 . 4 . 4 - C l i m a t ic a d j u s t m e n t : adjustments of the v a r i o u s c lima t i c zones

The values previously suggested are for dwellings with an average insulation and for climatic areas where the external temperature for the calculation of the heat requirement is -5°C (by means of these figures, correspondence is

obtained with the diagrams in gures

30 and 31). In the event that the climatic zone is different, adjust the gradient of

the curve (parameter ), so as to obtain a supply temperature of 80°C (45°C in the event of “Low temperature” systems), when the external temperature is that of the calculation base for the heat requirement.

7 . 4 . 5 - C l i m a t ic a d j u s t m e n t : switching on and off the heating service

The climatic adjust men t service is completely automatic, also with regards to sw itchin g off at th e end of th e season and subsequent switching on at the beginning of the season. The calculation algorithm envisages that, if the “Calculated temperature” is lower than the “Minimum heating temperature”

(parameter ) the heating service switches off. When the “Calculated te m perat ure” on ce agai n exceed s the “Minimum heating temperature”

(parameter ), the heating service switches back on. If the heating services switches off or comes on differently with respect to

requirements, just use control “31” as

per gure 1, in order to raise or lower

the calculated temperature and match the “Minimum heating temperature” in advance or on a delayed basis.

7 . 4 . 6 - C l i m a t i c a d j u st m e n t w i t h room compensation

By means of the “Installers’ Menu” (see

section 7.11) adjust the parameter to 02. Everything functions exactly as in the previous sections relating to “Climatic adjustment”, with the sole difference that now the boiler pump is permanently on. The opening of the room thermostat contact translates into a parallel movement downwards of the line

as per gures 30 and 31. The opening of

the room thermostat contact translates into a parallel movement downwards of

the line as per gures 7.11). The parameter can adopt values ranging between 1°C and 20°C. The suggested values for this parameter are:

- 10 ° C for radi a tor syst e ms (high temperature)

- 3°C for radiant panel systems (low temperature). Values of this parameter which are too high may translate into instability of the room temperature. Too low values may make the action of the room thermostat

uninuential.

C l i ma t ic a dj u s tm e nt w ith ro o m compensation can be used in all the cases envisaged by section 7.4.1 with the advantage that the on-going running of the pump manages to stabilize and standardize the room temperatures, especially in the event that certain loops of the heating system have hydraulic elements considerably greater than others.

Page 36

External temperature (°C)

Supply temperature (°C)

Figure 38 - Graphs of the climatic adjustment for high

temperature systems

Figure 39 - Graphs of the climatic adjustment for low

temperature systems

7 - USE

External temperature (°C)

Supply temperature (°C)Supply temperature (°C)

Supply temperature (°C)

OA = Inclination of the line Ob = Minimum heating temperature Oc = Maximum heating temperature br = “Fix point” of the angle fulcrum of the line b = parallel shift of the line (possible using the command on the panel)

OA = Inclination of the line Ob = Minimum heating temperature Oc = Maximum heating temperature br = “Set point” of the angle fulcrum of the line b = parallel shift of the line (possible using the command on the panel)

Page 37

7.6 - Timings of the various functions

In order to protect the life span of the appliance, improve the comfort generated, and increase energy saving, timings have been introduced during the functioning. These timings are:

- Pos t-circulation pump: each time th e room thermost at dete rmines a co nclu sion of the he atin g ser vice, the pump continues to function for 3 minutes;

- Heating delay: each time the domestic

hot water service nishes, there is a

waiting time of 2 minutes before the reactivation of the heating service;

- Pumps and switch valve blockage protection: every 24 hours a forcing of the heating pump, the domestic hot water pump (if present) and the switch valve takes place;

- Protection against legionnaires disease; if the boiler is connected to a storage tank for the preparation of d.h.w., every seven days the latter is forced to a temperature of 60°C so as to carry out disinfection against legionnaires bacteria.

- Domestic alarm; if the appliance remains in continual domestic hot water service for longer than two hours, an “A1” alarm is generated.

7.5 - Boiler settings (SWITCHES)

With just one control board (detail “13” of gure 1) it is possible to set the appliance in various different architectures. For this purpose, within the control board a series of electrical switches (see gure 21, detail “A”) is envisaged, identied by the

wording SWITCHES, whose positioning (ON or OFF) determines the type of functioning of the appliance.

CAUTION!!!

Changing these switches could cause the appliance and therefore the system to malfunction. For this reason,

only a professionally qualied technician, who is sensitive to and has in-depth knowledge of the appliance and

the functioning of the system, can change them.

JUMPERS Position Description

1 OFF Appliance with production of instant D.H.W. ON Appliance with production of D.H.W. via starage tank 2 OFF Appliance with production of instant D.H.W. ON Position not available for this series of appliances 3 OFF Pressure switch for minimum heating pressure, inhibited ON Pressure switch for minimum heating pressure, inserted 4 OFF MWL brand fan ON FIME brand fan 5 OFF Combined boiler, heating and d.h.w. ON Boiler for just heating 6 OFF Heating service functioning between 30°C and 80°C (low temperature system) ON Heating service functioning between 20°C and 45°C (high temperature system) 7 OFF Appliance TYPE change service, inhibited ON Appliance TYPE change service, enabled 8 OFF Position not available for this series of appliances ON Position not available for this series of appliances

7.9 - (Empty)

7 . 1 0 - E n e r g y Saving

In order to reduce energy wastage ge nera ted by the disp lay “48” as

per gure 1, it is possible to switch it

permanently off, with the exception of when it displays errors or settings. In order to switch it off, proceed as follows:  access the “Installers’ Menu” (see

section 7.12);

 set the parameter at a value other

than zero, considering that each value will correspond with a delay in minutes until the display goes into Energy Saving mode.

7 - USE

7.7 - Pump s and switch valve blockage protection

During the Summer period, the circulator switches on once a day for around 15 seconds in order to avoid any incrustations blocking it. At the same time, the switch valve is activated for the same reason.

7.8 - A n t i - f r eeze protection

CAUTION!!!

So that the anti-freeze protection is effective, it is necessary to leave the appliance connected to the electricity and gas mains and the two controls “30” and “31” as per

gure 1, turned to the OFF position.

Once the boiler has reached a temperature of 7°C, the heating pump automatically comes on (and the domestic hot water pump if present). If the temperature falls further under 2°C, the burner also switches on, so as to protect the boiler from any problems deriving from freezing conditions. If the boiler is not used for a long period of time (more than a year), we advise emptying it following the procedures indicated in sections 8.10 and 8.11.

Page 38

7.11 - “Users’ menu”

When entering the “Users’ menu”, the

display “48” as per gure 1, starts to

blink indicating to the user that a change of mode has taken place. In order to access the “Users’ menu” just:

 press the button for 2 seconds

until the display starts to blinking;

 press and release the

button several times until the parameter desired is displayed;

 by means of the

or keys, it is possible to change the value of the parameter.

 Press

in order to conrm the

amended data and pass onto the next parameter.

Once you have reached the end of the

menu, on the last , the display stops blinking indicating exit from the menu. If no key is pressed for more than 60 seconds, one automatically exists the menu. Any change in the parameters

not conrmed using the button, will be lost. It is possible to change or consult the following parameters in this menu:

7 - USO

Adjustment of the gradient of the line as per gures 38 and 39 (visible only with climatic adjustment active. See section 7.2).

Adjustment of “Minimum heating temperature” (visible only with climatic adjustment active. See section 7.2).

Adjustment of Maximum heating temperature” (visible only with climatic adjustment active. See section 7.2).

Adjustment of the parallelism of the line as per figures 38 and 39 (visible only with climatic adjustment active. See section 7.2).

Display of calculated heating temperature (if climatic adjustment active, see section 7.2) or display of temperature set via the control “31” as

per gure 1.

Display of domestic hot water temperature set via

the control “30” as per gure 1.

Display of last error registered.

Display of last block which occurred.

Setting range: 0,1-5,0

Setting range: see section 7.4.3

Only display. The regulation is carried out using the

control “31” as per gure 1. It can adopt values ranging

between -10°C and +10°C

Only display. It can adopt values ranging between 20°C and 80°C

Only display. It can adopt values ranging between 40°C and 70°C (see also section 7.1)

Only display. It can adopt the values indicated in section

7.13.2

Only display. It can adopt the values indicated in section

7.13.1

PARAMETER DESCRIPTION INFORMATION ON DISPLAY “48” of gure 1

Page 39

7.12 - “Installers’ menu”

CAUTION!!!

Changing these parameters could cause the boiler and therefore the system to malfunction. For this reason, only a technician who is sensitive to and has in-depth knowledge of the appliance can change them.

The boiler’s micro-processor makes this menu of parameters available to the technician for the analysis of the functioning and adjustment of the appliance to the system. When entering the “Installers’ Menu”, the display of the parameters “48” as

per gure 1, blinking to indicate that a

change of mode has occurred. In order to access the “Installers’ Menu” just:

 keep the button pressed

down for 12 seconds until the parameter is displayed;

 continually press and release the

button to scroll through the

list of the parameters;

 once the parameter has been

displayed, it can be changed using

the or keys;

 press and release the button

in order to conrm the amended

data and pass onto the next parameter.

 once you have reached the end of

the menu, on the last , the

display stops ashing indicating exit

from the menu.

If no key is pressed for more than 60 seconds, one automatically exists the menu. Any change in the parameters

not conrmed using the button, will be lost. It is possible to change or consult the following parameters in this menu:

7 - USO

Page 40

PARAMETER DESCRIPTION INFORMATION ON DISPLAY “48” OF FIGURE 1

Value in °C (cannot be changed)

Value in °C (cannot be changed) (displayed only if climatic adjustment is active, as per section 7.2)

Value from 0 to 99 (at 30 it corresponds to a current of 1uA, at 99 it

corresponds to a current of 5.5 uA) (cannot be changed)

Value in °C (cannot be changed)

Can be changed in accordance with the instructions indicated in the gas conversion kit

00 = contact open (heating service off) 01 = contact closed (heating service on)

Value in g/1’/100 (rpm/100) (cannot be changed)

Adjustable according to the instructions of section 6.9

Can be changed: 00 = thermostatic adjustment (see section 7.3); 01 = climatic adjustment (see section 7.4); 02 = climatic adjustment with room compensation (see section 7.4.6);

Can be changed from 1 to 10 (active only with climatic adjustment). See section 7.4.3 for its adjustment.

Can be changed from -9 to 65 (active only with climatic adjustment). See section 7.4.3 for its adjustment.

Can be changed: from 1 to 20 (active only with climatic adjustment featuring room compensation) See section 7.4.6 for its adjustment.

Can be changed: 01 = knobs presents; 00 = knobs absent

Can be changed: 00 = display always on; any other value, corresponds to a delay in the switching off of the display, expressed in minutes (also see section 7.10)

Can be changed: from 00 to 03 (the correspondence of the speeds of

the pump with the value, can be seen in gures 6)

Boiler and heating supply temperature, gauged by NTC1 sensor

Domestic hot water temperature, gauged by NTC2 sensor

Domestic cold water (or storage tank) temperature, gauged by NTC3 sensor

Outside temperature, gauged by NTC4 sensor

Ionization current gauged

High limit temperature, gauged

by NTC6 sensor

Flue gas temperature, gauged by NTC7 sensor

Type of basic setting of control board

Status of room thermostat contact

Measurement of fan speed rotation

Power set for heating service

Heating service functioning mode

Reaction to external temperature changes

Angle fulcrum of climatic adjustment line

Reduction of temperature generated by the opening of the room thermostat

Boiler knobs’ status

Display “48” as per gure 1

energy saver

Pump speed selector switch, for just the heating service

7 - USE

Page 41

7.13 - Diagnostics

During the routine functioning of the appliance, the display “48” as per

gure 1, continually shows the operating

status of the appliance, via the following indications:

7 - USE

PARAMETER DESCRIPTION RIGHT-HAND DISPLAY

Boiler in stand-by mode or pause (no request for heating or domestic hot water)

Anti-freeze function active

Parameter not available for this boiler model.

CAUTION!!! system pressure too low, ll system (see section

6.1.3)

Domestic hot water service on

Heating service on

Boiler in lock-out mode. To reset it, press the

button. If

the lock-out occurs frequently, contact a professionally qualied

technician.

Boiler fault. Contact a professionally qualied technician

Auto-purging procedure in progress (see section 6.5.1). It will end within 2 minutes

Anti-Legionnaires disease procedure in progress (see section

5.13.1). It will terminate when the water in the storage tank reaches a temperature of 60°C.

Boiler temperature (°C)

No display

Domestic hot water temperature (°C)

Heating temperature (°C)

Lock-out code (see section 7.12.1 for decoding).

Error code (see section 7.12.2 for decoding).

Boiler temperature (°C)

Storage tank temperature (°C)

DISPLAY (detail“48” of gure 1)

1 - Parameter display. 2 - Display of values adopted by parameters 3 - Indicator of burner status. On = burner on; Blinking = burner off. 4 - Indicator of domestic service status. On = domestic service active; Off = domestic service inactive. 5 - Indicator of decimal of displayed value. 6 - Indicator of heating service status. On = heating active; Off = heating inactive.

Page 42

7.13.1 - Diagnostics: “L” lock-outs

7 - USE

“L”

Code

Lock-out description Controls

Solutions

L01

No ame detected after three

subsequent ignition attempts

Check: Gas supply pressure (se e section 6. 6 ), spark s on ignitions electrodes (see section 8.5); correct pressure of comburant air (see section

6.7); 220Vac electricity supply to gas valve; electrical element of the two coils of the gas valve

0.88 Kohm and 6.59 Kohm

If the supply pressure is incorrect, it is necessary to take steps upstream from the appliance in order to restore it; if the comburant air pressure is incorrect, it is necessary to take steps on the venting system in order to eliminate any obstruction; if the current to the gas valve is not 230Vac it is necessary to replace the control and command board; if the electrical element of the gas valve is not

0.88 Kohm and 6.59 Kohm, the valve must be replaced.

If the burner switches on and off at the end of the ignition attem p t , c h e ck : t h a t th e ionization current is set at a value greater than 60 (follow procedure in section 8.8.4).

If the ionization current is not greater than 60, it is necessary to check the CO2 (see section

6.8) and restore the correct value, check the ionization electrode and if necessary replace it, check the integrity of the electrical circuits wires of the ionization current.

L02

Flame extinguishes three times

greater than 60, it is necessary to check the CO2 (see section 6.8) and restore the correct value, check the ionization electrode and if necessary replace it, check the integrity of the electrical circuits wires of the ionization current.

Check: that the ion iza tio n current is set at a value greater than 60 (follow procedure in section 8.8.4) If the ionization current is not

L04

Gas valve command relay Replace the command and control board

L07

If the sensor does not comply with the correct values, replace it;

L08

L03

Boiler temperature over 95°C.

Che c k t h a t th e p u mp i s working

L05

Safety relay or earth

inefcient

Check the earth ing of the appliance

If the earth is good, replace the command and control board

L06

Flue gas sensor over 110°C

Chec k that the el e c t r i cal ele m e n t o f t he f l u e ga s sen s or compl i e s with the graph in section 8.9; check

the efciency of the boiler, it

must be over 96%

If the sensor does not comply with the correct

values, replace it; if the boiler efciency is less

than 96% and the operating parameters are correct, it is necessary to replace the primary heat exchanger and place a filter at the entrance of the heating return connection.

Electrical circuit of flue gas sensor interrupted

Chec k that the el e c t r i cal

element of the ue gas sensor

complies with the graph in section 8.19;

Spark generator relay Replace the command and control board

L09

RAM memory Replace the command and control board

L10

E2prom memory damaged Replace the command and control board

L12

E2prom memory damaged Replace the command and control board

L13

Programme error Replace the command and control board

L14

Programme error Replace the command and control board

L15

Programme error Replace the command and control board

L16

Programme error Replace the command and control board

Restore the water circulation or replace the command and control board

Check: th at the fl u e gas discharge is appr opr iately protected from obstructions caused by gusts of wind.

If the flue gas discharge is positioned on vertical walls, it is necessary to protect it with a

wind-protection grill; if the ue gas discharge is

positioned above the roof, check that it is not in

a ow-back zone, and that any wind-protection

chimneypot is really effective.

Page 43

7 - USE

“L” Code Lock-out description

Controls Solutions

L17

Temperature difference between NTC1 and NTC6

Chec k that the el e c t r i cal element of the two sensors complies with the graph in section 8.9;

If one of the two or both sensors do not have the correct values, it is necessary to replace

L18

Programme error

Replace the command and control board

L19

Gas valve: ame sensed for

10 seconds after the closure of the valve

Replace gas valve

L20

Gas val v e : fl ame sensed before opening of gas valve.

Replace gas valve

L32

Programme error Replace the command and control board

L33

Fan rotation error Check that it is powered at

300 Vdc.

If the fan is powered, it is necessary to replace it differently, replace the board.

L45

Heati ng circuit fill ing time longer than 10 minutes.

Check the pressure switch setting pressure, FILL must appear when the pressure drops below 0.6 bar; check that there are no water leaks from the heating system.

If the pressure switch is not correctly set, it must be replaced; if the system has a leak, it

must be xed.

L46

Fill i n g o f he a t in g c i rc u i t repeated 16 ti m es in 24 hours

Check the pressure switch setting pressure, FILL must appear when the pressure drops below 0.6 bar, and must disappear when the pressure rises above 1.5 bar; check that there are no water leaks from the heating system.

If the pressure switch is not correctly set, it must be replaced; if the system has a leak, it

must be xed.

L25

NTC6 error sensor

Chec k that the el e c t r i cal element of the sensor complies with the graph in section 8.9;

If the sensor is not within the correct values, it is necessary to replace it. Otherwise, it is necessary to replace the control board.

“E” Code Lock-out description

Controls Solutions

E01

NTC1 boiler tempera t u r e sensor circuit interrupted.

Check that the electrical element of the sensor complies with the graph indicated in section 8.9; check the electrical connection cables between the probe and the command board

If the electrical element of the probe does not comply, it must be replaced; if the electrical circuit is damaged, it must be repaired; if the previous two cases do not apply, replace the command and control board

E02

NT C2 domes tic hot water temperature sensor circu it interrupted.

Check that the electrical element of the sensor complies with the graph indicated in section 8.9; check the electrical connection cables between the probe and the command board

E07

NTC3 cold water temperature sensor circuit interrupted.

Check that the electrical element of the sensor complies with the graph indicated in section 8.9; check the electrical connection cables between the probe and the command board

E08

Circuito sensore temperatura caldaia NTC6, interrotto.

Check that the electrical element of the sensor complies with the graph indicated in section 8.9; check the electrical connection cables between the probe and the command board

7.13.2 - Diagnostics: “E” errors

them;

Page 44

“E”

Code

Lock-out

description

Controls Solutions

E11

NTC1boiler temperature sensor circuit short-circuited.

Check that the electrical element of the sensor complies with the graph indicated in section 8.17; check the electrical connection cables between the probe and the command board

E12

NTC2 domestic hot water temperature sensor circuit short-circuited

Check that the electrical element of the sensor complies with the graph indicated in section 8.17; check the electrical connection cables between the probe and the command board

E13

Erroneous temperature reading. Replace the command and control board

E14

Erroneous temperature reading. Replace the command and control board

E15

Erroneous temperature reading. Replace the command and control board

E16

Erroneous temperature reading. Replace the command and control board

E17

NTC3 cold water temperature sensor circuit short-circuited

Check that the electrical element of the sensor complies with the graph indicated in section 8.17; check the electrical connection cables between the probe and the command board

E18

NTC6 boiler temperature sensor circuit short-circuited

Check that the electrical element of the sensor complies with the graph indicated in section 8.17; check the electrical connection cables between the probe and the command board

E19

E2prom memory damaged Replace the command and control board

E20

Flame presence with gas valve closed

Replace the gas valve

E21

Phase and neutral inverted Invert phase and neutral

E22

Mains frequency other than 50Hz

Check the electrical frequency of the system.

If the mains frequency is other than 50Hz, contact the electricity distribution company; if the mains frequency is 50Hz, replace the command and control board.

E23

No earth connection Check the correct earthing of

the system.

Restore the correct earthing of the system.

If the earth correction is already sufcient,

replace the command and control board.

E30

Erroneous temperature reading. Replace the command and control board

E31

Erroneous temperature reading. Replace the command and control board

E32

Erroneous temperature reading. Replace the command and control board

E33

Erroneous temperature reading. Replace the command and control board

E42

Programme error or earth

connection insufcient

Check the correct earthing of the system.

Restore the correct earthing of the system.

If the earth correction is already sufcient,

replace the command and control board.

E50

Boiler TYPE selection error If the selector switches are positioned correct-

ly, replace the comand and control board

Check the JUMPERS selector switch as per section 7.5.

E51

Reset button pressed too often in a short period of time

7 - USE

Page 45

Figure 41 - Opening the control panel

8 - MAINTENANCE

8.1 - General warnings

CAUTION!!! Maintenance

operations must only be carried

out on the boiler by qualied

technicians.

CAUTION!!! Before any maintenance operations, disconnect the appliance from the electricity mains, using the appropriate switch nearby.

CAUTION!!! Before any maintenance operations, close the gas cock.

8.2 - Disassembling t h e c a s i n g a n d accessing internal components

In order to disassemble the casing,

proceed as follows (refer to gure 32):

 unscrew screws “A”  raise the fastener “C”;  extract the casing outwards “D”;  push tabs “F” downwards and

accompany instrument panel “G” during its rotation towards the front;

 remove screws “H” in order to

access the inside of the box of electrical connections;

 push tabs “E” laterally and extract

the cover for accessing the inside of the electrical box;

 open the fastener “I”;  draw cover “L” out, in order to

access the inside of the combustion chamber;

Page 46

8.3 - Cleaning of the condensation collecting trap

In order to correctly clean the conveying and collection trap for the condensation produced by combustion, it is necessary to proceed as follows

(refer to gures 42 and 43):

 force the domestic hot water service

as described in section 8.15, with the aim of lowering the level of liquid present in the trap “A”;

 access the internal components

following section 8.2;

 place a waterproof cover “B”, over

the electrical panel, to avoid any drops of water entering the electrical system;

 loosen spring “C” with a pair of

pliers, pushing in downwards;

 draw out the condensation tube “D”

downwards;

 unscrew the nut “E”;  pull out trap “A” downwards, taking

care since it is full of condensation water and during the rotation outwards it could spill;

 open the trap and clean inside;  re-assemble everything, proceeding

in reverse order, taking care that

gasket “F” is replaced in the specic

housing;

 restore the level of liquid inside the

trap pouring in 100 cm3 of water (a

glassful) via the ue gas discharge

or opening “H” as per Figure 44.

Figure 42 - Preparation for the extraction of the

condensation collecting trap

Figure 43 - Dismantling the condensation collecting trap

8 - MAINTENANCE

Page 47

8 - MAINTENANCE

8.4 - Cleaning the burner and primary heat

exchanger (ue gas side)

To correctly clean the burner and the heat ex-

changer (ue gas side), proceed as follows:

 access the internal components following

instructions in section 8.2;

 unscrew bolt “D” as per gure 44;  disconnect the wires from the ignition

sparkplugs and the wire from the detection

plug (see gure 1, details 42, 44 and 45);

 disconnect the wire from the safety sensor “F”

as per gure 44;

 undo the four nuts “C” as per gure 44;  extract the entire fan and burner unit, detail “A”

as per gure 44;

 use a cylindrical brush, with plastic bristles, to

clean the inside of the combustion chamber

(detail “H” of gure 44);

 use a vacuum cleaner to remove any unburned

residue from the combustion chamber (detail

“H” of gure 44);

 using the same vacuum cleaner, clean

the surfaces of the burner and around the electrodes;

 reassemble the components by proceeding in

reverse order;

 open the gas cock;  restore normal electrical power.  check that there are no gas leaks between the

removed joints.

8.5 - Correct positioning of the ignition and ionization electrodes

So that the appliance works satisfactorily, it is indispensable that the electrodes are positioned

correctly (refer to gure 45):

the distance between the ignition electrodes

“A” and “B”, must be between 2,0 and 2,5 mm;

the distance of the ignition electrodes from the

surface area of the burner must be between 5 and 5.5 mm;

the distance of the ionization electrode from

the surface of the burner, must be between 6,0 and 6,5 mm.

8.6 - Secondary heat exchanger for the production of d.h.w.

The production of d.h.w. is delegated to the

secondary heat exchanger (detail “37” of gure

1). If this exchanger, over time, is no longer

efcient, it may be necessary to clean or replace

it.

Figure 44 - Dismantling the fan-burner unit

Figure 45 - Positioning of electrodes on burner

Page 48

8 - MAINTENANCE

8.7 - Replacement of the pump motor

If it becomes necessary to replace the circulator pump, proceed as follows

(refer to gure 49):

 empty the water from the heating

circuit, following the procedure indicated in section 8.10;

 access the internal components of

the appliance, following section 8.2;

 remove screws “B”;  extract pump “A” outwards;  disconnect the electrical wires from

the pump unit.

8.8 - Checking the expansion tank

The expansion tank is positioned at the back of the boiler. In order to check the pressure or dismantle it, proceed as

follows (refer to gure 50):

 dismantle the discharge pipe from

tting “2” as per gure 1;

 remove screws “B”;  remove part “C”;  with your hands, turn the expansion

tank “A”, until valve “F” is in an accessible position;

 release the pressure from the

heating circuit following the procedures in section 8.10;

 check the pre-lling pressure of the

expansion tank. It must be 1 bar. If the pressure is lower, proceed to reinstate it, letting the water run out of the heating discharge cock (detail

“11” of gure 1).

If the expansion tank needs to be replaced, proceed as follows:  empty the heating circuit, following

the procedure indicated in section

8.10;

 unscrew nut “E”;  remove the expansion tank, drawing

it out upwards.

Figure 49 - Replacing the pump motor

Figure 50 - Accessing the expansion tank

Page 49

8 - MAINTENANCE

8.9 - Dismantling the 3-way valve

The 3-way valve (detail “F” of gure

52) inverts the ow of water produced

by the primary heat exchanger, to the heating circuit or the secondary heat exchanger for the production of d.h.w.. Should it become necessary to replace

it, proceed as follows (refer to gures

51, 52 and 53):  empty the water from the heating

circuit, following the procedure indicated in section 8.10;

 access the internal components of

the appliance, following section 8.2;

 disconnect the ttings “A” and “B”;  unscrew screw “C”;  remove spring “E” and extract the

by-pass pipe “D” towards the back of the appliance;

 remove the fork “G”;  extract the servomotor “H”;  unscrew tting “I”;  unscrew screw “L”;  extract the entire block of the 3-way

valve “F” outwards taking care with

the gaskets “M” (see gure 53);

 during reassembly, take care with

the positioning of the gaskets “M”.

Figure 51 - Dismantling the supply and return ttings

Figure 52 - Dismantling the 3-way valve servomotor

Figure 53 - Extracting the 3-way valve

Page 50

8 - MAINTENANCE

Figure 54 - Heating circuit discharge cock

8.10 - Draining the heating side of the appliance

To empty the boiler from the heating side, proceed as follows:

 turn off the boiler;  allow the water inside to cool by

switching off the room thermostat and turning control “31” as per

gure 1 to minimum. Wait until the display “48” as per gure 1 shows a

temperature of at least 40°C;

 access the internal components

following the procedure indicated in section 8.2;

 connect a exible rubber hose to the

discharge cock “A” (see gure 54)

and place the other end in a sink plughole or similar;

 open discharge cock “A”;  open the bleeding valves of the

radiators. Begin with the upper radiators and continue with the lower ones;

 after draining out all the water,

close the radiator bleed valves and discharge cock “A”;

CAUTION!!! Do not recover and/or re-use water drained from the heating circuit for any purpose as it could be contaminated.

8.11 - Draining the domestic side of the appliance

To empty the boiler from the domestic

side, proceed as follows:

 close the main domestic cold water

supply cock of the house;

 open all the hot and cold water

cocks in the house;

 ensure that at least one of these is

at a lower level than the boiler.

8.12 - Forcing

So as to carry out specic checks, dealt

with case by case in the manual, it is possible to force the functioning of the appliance.

8.13 - Auto-purging

It is possible to re-set the auto-purging

procedure, by pressing keys and

together for 10 seconds, until the

letter F appears on the display. Then

press .

8.14 - Fan

It is possible to generate the start-up of

just the fan, by pressing keys and

together for 10 seconds, until the letter F appears on the display. Now the fan will remain on for 10 minutes. In order to exit in advance from the forcing of the

fan, press the key.

8.15 - Minimum and maximum output

It is possible to force the functioning of the appliance to its minimum or maximum output, both during the heating service and during the domestic hot water service; proceed as follows:  generate a request for the service you

wish to force:

- heating: switch on the room thermostat

and turn control “31” of gure 1 to

maximum;

- domestic hot water: turn control “30” of

gure 1 to maximum and fully open the

hot water tap;

 by pressing keys

and

together for more than 10 seconds,

until appears on the display;

 press key

until the display

shows:

- for forcing the heating to minimum output;

- for forcing the heating to maximum output;

- for forcing the domestic hot water to minimum output;

- for forcing the domestic hot water to maximum output;

 press the key in order to

restore the boiler to normal running conditions.

8.16 - Checking the

ionization current

During the checks on the minimum and maximum output (see section 8.15), the display shows the letter of the service checked, t or S and at the same time, in the second part of the display, shows the value of the ionization current. At 30 it corresponds to a current of 1 uA, at 99 to a current of 5.5 uA. This value must always be greater than at least 60.

Page 51

8.17 - Water

temperature gauging sensor

A number of sensors, which gauge the temperature, are positioned on the boiler’s heat exchanger. The electrical resistance existing between the two contacts of the sensor must correspond with the values shown in

gure 55.

The temperature sensors are: NTC1; NTC2, NTC3, NTC5 and NTC6, whose positioning can be ascertained in

gures 1, 57 and 58.

8.18 - Outside

temperature sensor

An outside temperature sensor can be connected to the boiler on request (see sections 7.2 and 7.4). The electrical resistance existing between the two contacts of the sensor must correspond with the values shown in

gure 56.

8 - MAINTENANCE

Figure 55 - Water sensors’ curve

Figure 56 - Outside temperature sensor curve

Page 52

8.19 - Functional wiring diagram

Figure 57 - Functional wiring diagram

CM - Command and control

board C R - Re mo t e c on t r o l (optional) CR0 4 - R em o te co nt ro l (optional) EA - Ignition electrode ER - Detector electrode F1 - Power supply fuse 1.6A F2 - Storage tank pump fuse

GS - Spark generator IG - On/off power switch IEI - Summer/Winter switch INT - Opentherm interface J1 - 6-pole connector J2 - 4-pole connector J3 - 12-pole connector J4 - 4-pole connector J5 - 16-pole connector J10 - 10-pole connector J18 - 8-pole connector NTC 1 - Boiler temperature sensor NT C 2 - D . H .W. o u t let sensor NTC 3 - Domestic cold water inlet sensor or storage tank sensor NTC 4 - Outside temperature

sensor (optional) NTC 6 - High temperature limit sensor NTC 7 - Flue gas temperature sensor NTC 8 - Return temperature sensor (optional) PB - Stora g e ta nk pump (optional) PO1 - Circulator pump PR - Water pressure switch PS R - Hea ting addi tion al pump R1 - Support relay for

external pump (max 100 W)

RAN - Relais for antifreezing

resistance

SB - Storage tank sensor (optional) SDC - Connection board TA1 - Room thermostat bridge inside the boiler TA2 - Room thermostat bridge on remote control (optional) TAN - no pre s ent in this model V3V - 3-way valve VC - Automatic charge valve

VE - Fan VG - Gas valve

8 - MAINTENANCE

Page 53

8.20 - Multiwire wiring diagram

Figure 58 - Multi-wire wiring diagram

Key -

see key to gure

8 - MAINTENANCE

Page 54

9 - TECHNICAL FEATURES

MODEL NOVADENS 24 NOVADENS 34

Country of destination GB-IE GB-IE Type C13;C33;C43;C53;C63;C83 Category II2H3P II2H3P EC type certicate (PIN) 0694BR1222 0694BR1222 Nominal input heat “Q”= kW 25,0 34,8 Minimum input heat kW 5,0 8,0 Nominal output heat (80/60) “P” = kW 24,5 34,1 Nominal output heat (50/30) “P” = kW 26,2 36,2

Efciency at nominal output heat (80/60) % 98 98 Efciency at nominal output heat (50/30) % 104 104

Minimum output heat (80/60) kW 4,9 7,8 Minimum output heat (50/30) kW 5,2 8,3

Efciency at minimum output heat (80/60) % 97 97 Efciency at minimum output heat (50/30) % 104 104 Efciency at minimum output heat (37/30) % 108,2 108,2 Certied efciency (92/42/CEE) stars

Chimney loss with burner on (80/60) % 1,5 1,5 Chimney loss with burner off % 0,2 0,2 Casing loss with burner on % 0,5 0,5 Casing loss with burner off % 0,1 0,1 Gas ow rate Natural gas m

/h 2,64 3,68 LP Gas Kg/h 1,94 2,70 Gas supply pressure (mbar) Natural gas mbar 20 20 LP Gas mbar 30 30 Minimum gas supply pressure (mbar) Natural gas mbar 15 15 LP Gas mbar 25 25 Maximum gas supply pressure (mbar) Natural gas mbar 27 27 LP Gas mbar 45 45 Comburant air pressure Natural gas mbar 6,6 4,4 LP Gas mbar 6,6 3,8 Water capacity of the primary heat exchanger lt 2 2 Weight of primary heat exchanger kg 11 11 Water capacity of the secondary heat exchanger lt 10 10 Weight of secondary heat exchanger kg 5 5 D.h.w. output heat kW 24,5 34,1

D.h.w. production with semi-accumulation in rst 10 min (dt 30°C) l 125 172

Instant d.h.w production (dt 30°C) l/min 11,7 16,3 Design temperature °C 95 95 Maximum heating temperature °C 80 80 Minimum heating temperature °C 20 20 Maximum heating pressure “PMS” = bar 3 3 Minimum heating pressure bar 1 1 Maximum pressure of domestic hot water circuit bar 7 7 Minimum pressure of domestic hot water circuit bar 0,05 0,05 Capacity of expansion tank lt 10 10 Nominal power supply voltage V 230 230 Nominal power supply frequency Hz 50 50 Absorbed electric power W 105 105 Degree of electrical protection IP 20 IP 20 Flue gas pipes diameter (split) mm 80 or 60 80 or 60

Max. length ue gas pipes (split)(80) m 40 25 Max. length ue gas pipes (split)(60) m 15 10

Flue gas pipes diameter (coaxial) mm 60/100 60/100 Max. length ue gas pipes (coaxial) m 3,7 3,7

Equivalent length of one elbow m 45° elbow = 0.5m, 90° elbow = 1m CO (0% O2 with natural gas) ppm 10 20 NOx (0% O2 with natural gas) (class 5 EN 483 and EN 297) ppm 9 17 CO2 (%) Natural gas 8,7/9,0 8,7/9,0 LP gas 10/10,5 10/10,5

Maximum ue gas temperature °C 90 90 Flue gas mass ow Kg/h 42,3 59

Head available at discharge Pa 60 60

Maximum condensation ow rate l/h 3,84 5,57

Average degree of acidity of condensation PH 4 4

Boiler weight kg 50 50

Page 55

The undersigned company COSMOGAS S.r.L., with registered ofces in Via L. Da Vinci 16 - 47014 Meldola (FC) ITALY,

DECLARES

under its own exclusive liability that the product:

forming the subject matter of this declaration, is compliant with the model

described in the

type Examination Certicate, with reference to the

table headed “EC type certicate (PIN)” in section 9 and in accordance with

the provisions of the following Directives: Gas Appliances, (90/396/EEC),

Efciencies, (92/42/EEC), Low Voltage, (2006/95/EC), Electromagnetic

Compatibility,

(2004/108/EEC).

(The warranty number matches the serial number)

This declaration is issued in accordance with that established by said Directives.

Meldola (FC) ITALY, (Date of manufacture).

MANUFACTURE DATE

WARRANTY No

GAS BOILER MODEL

10 - EC COMPLIANCE DECLARATION

Page 56

COSMOGAS s.r.l.

Via L. da Vinci 16 - 47014

MELDOLA (FC) ITALY

info@cosmogas.com

www.cosmogas.com

COSMOGAS NOVADENS 24, NOVADENS 24B, NOVADENS 24C, NOVADENS 24P, NOVADENS 34 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual