POWER PLUS BOX 1002-1003-1004 P INT-EXT

INSTALLATION INSTRUCTIONS

CONDENSING

This booklet code 20074299 - Rev. 2 (11/13) comprises 40 pages.

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RANGE

MODEL CODEPower Plus Box 1002 P INT 20067829Power Plus Box 1003 P INT 20067830Power Plus Box 1004 P INT 20067831Power Plus Box 1002 P EXT 20067832Power Plus Box 1003 P EXT 20067833Power Plus Box 1004 P EXT 20067834

CERTIFIED COMPANYUNI EN ISO 9001:2008UNI EN ISO 14001:2004

This booklet code- Rev.comprisespages.

ENGLISH

CONTENTS

The following symbols are used in this manual:

b CAUTION! = Identifies actions that require caution and adequate preparation.

a STOP! = Identifies actions that you MUST NOT do.

1 GENERAL INFORMATION . . . . . . . . . . . . . . . . 32 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 TECHNICAL FEATURES . . . . . . . . . . . . . . . . . 43.1 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2 Advantages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.3 Safety devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.4 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 84.1 Product packaging and identification. . . . . . . . . . 84.2 Installation premises . . . . . . . . . . . . . . . . . . . . . . . 84.3 Water connections . . . . . . . . . . . . . . . . . . . . . . . . 94.4 System cleaning and water treatment. . . . . . . . . . 94.5 Positioning and preparation for installation. . . . . . 94.6 Condensate outlet. . . . . . . . . . . . . . . . . . . . . . . . 104.7 Water circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.8 Exhaust flue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5 INSTALLATION DIAGRAMS . . . . . . . . . . . . . 116 ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . 126.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 126.2 Electrical connections. . . . . . . . . . . . . . . . . . . . . 126.2.1 Connection to mains . . . . . . . . . . . . . . . . . . . . . . 126.2.2 Master board connection . . . . . . . . . . . . . . . . . . 136.2.3 Connection to thermoregulators . . . . . . . . . . . . . 146.2.4 Connection to pumps . . . . . . . . . . . . . . . . . . . . . 146.2.5 Connection to room thermostats (on/off) . . . . . . 146.2.6 Connection to weather temperature probe. . . . . 146.2.7 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . 166.2.8 Connection to 0-10v external thermoregulator . . 166.2.9 Connection to alarm device . . . . . . . . . . . . . . . . 166.2.10 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . 166.3 Emergency mode . . . . . . . . . . . . . . . . . . . . . . . . 166.4 Cascade installation . . . . . . . . . . . . . . . . . . . . . . 176.4.1 Connection to mains . . . . . . . . . . . . . . . . . . . . . . 176.4.2 Serial Connection (BUS) . . . . . . . . . . . . . . . . . . . 176.5 Position of the flow probe . . . . . . . . . . . . . . . . . . 17

7 FIRST OPERATING . . . . . . . . . . . . . . . . . . . . 187.1 Slave board setting . . . . . . . . . . . . . . . . . . . . . . . 187.1.1 Example of configuretion of a battery with 7 burner

in cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187.2 Gas valve calibration . . . . . . . . . . . . . . . . . . . . . 19

8 USE AND ADJUSTMENT . . . . . . . . . . . . . . . . 208.1 Control panel: description. . . . . . . . . . . . . . . . . . 208.2 Display mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.3 Visualization of temperature and functional status of

the various systems . . . . . . . . . . . . . . . . . . . . . . 218.4 User parameter change . . . . . . . . . . . . . . . . . . . 228.5 Monitor mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9 ADJUSTING THE FUNCTIONAL PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . 24

9.1 Setting the heating parameters. . . . . . . . . . . . . . 249.2 Setting the DHW parameters . . . . . . . . . . . . . . . 259.3 Heat control setting. . . . . . . . . . . . . . . . . . . . . . . 26

10 LIST OF PARAMETERS . . . . . . . . . . . . . . . . . 3111 ERROR LIST . . . . . . . . . . . . . . . . . . . . . . . . . . 3211.1 Master board errors . . . . . . . . . . . . . . . . . . . . . . 3211.2 Slave board errors. . . . . . . . . . . . . . . . . . . . . . . . 3211.3 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 34

12 TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . 3613 WATER IN CENTRAL HEATING SYSTEMS . 37

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1 GENERAL INFORMATIONDear Customer,congratulations on your choice and thank you for placing your confidence in our products. With Power Plus Box P INT-EXT you have chosen technology that is the very essence of energy saving and functionality.Moreover, all B products conform to the strictest di-rectives and European standards in force.

This product was produced, amongst others, in conformity to the following directives and standards:

- Directive 2009/142/EC - Gas Appliances - Directive 92/42/EEC on efficiency requirements and

Annex E and Pres. Republic Decree n. 412, 26 Au-gust 1993 (****)

- Electromagnetic Compatibility Directive 2004/108/EC - Low Voltage Directive 2006/95/EC - Boiler and Condensation UNI EN 677 standard.

The Power Plus Box P INT-EXT condensing modular systems moreover conform to the regulatory provisions pursuant to the INAIL “R” File, section R.3.B.

B has been certified with UNI EN ISO 9001/2000 since 22.07.2004.Power Plus Box P INT-EXT is furthermore a product having to its credit:

- European Conformity Mark (based on Directive 92/42/CEE) issued by the authorized German certifi-cation organization ;

- Maximum energy efficiency class (according to Di-rective 92/42/EEC) identified by the symbol ****;

- Classified in the strictest class for nitrogen oxide-re-lated pollution (fifth grade according to UNI EN 297)

- Patented heat exchanger.

2 WARNINGS

b The heating unit must be used for the purpose for which it was specifically designed and produced. Any whatsoever contractual or extra-contractual lia-bilities for damages caused to persons, animals or objects due to errors in installation, adjustment, main-tenance and improper usage are to be excluded.

b Installation must fully comply with provisions of the law in force and instructions provided by the ma-nufacturer to ensure safety and correct functioning, always calling upon professionally qualified technical personnel who will issue the declaration of conformity for the installation accomplished with good workman-ship, in compliance to regulatory provisions in force and guidelines given in this handbook. The applian-ce must be installed in appropriate premises and to-gether with the specific systems installed according to the law.

b Commissioning will be carried out by personnel from the authorized Technical Assistance Centre only and within 8 days from when the appliance was installed. After initial ignition the Technical Assistance Centre will fill in the warranty certificate, leaving the user their part to be kept, marking the beginning of the period of guarantee at the terms and conditions specified on the relative slip.

b The appliance in its original packing may be expo-sed to temperatures between 4°C and 40°C. Do not expose the appliance to bad weather conditions after it has been unpacked, anyhow to temperatures below 4°C or above 40°C until it has been connected up to the water, gas and electricity mains so as to be able to activate the frost protection systems described in paragraph 6.2.7.

b Check that the product is complete, undamaged and as ordered as soon as you receive it. Report any di-screpancies or damage to the dealer who sold it.

b In case of leaks, disconnect the heating unit from the mains, close the water from the mains and promptly contact the Technical Assistance Centre.

b Regularly check that the condensate drain is free from obstruction.

b Regularly check that the working pressure of the wa-ter circulation system, when cold, is below the maxi-mum limit specified for the appliance. If not, contact the Technical Assistance Centre.

b Maintenance jobs on the heating unit must be carried out by personnel from the authorized Technical Assi-stance Centre.

b We recommend cleaning inside the exchanger once a year, extracting jet and burner and removing any installation debris by suction. This operation will be done by personnel from the Technical Assistance Centre only.

b The warranty slip endorsed during the course of com-missioning will have to be produced for any servicing required during the guarantee period. The manu-facturer shall not be held liable for any damages cau-sed by mishandling, improper use or errors in instal-lation, use and maintenance work on the appliance. In the event of breakdown or malfunction switch off the appliance, avoiding to make any attempt to repair it and contact the Technical Assistance Centre.

b This manual must be read carefully for the boiler to be used rationally and safely, and must be kept with care so as to be on hand where required by the technician or installer, to facilitate the appropriate installation, running and maintenance of the boiler. B will not be held liable for any translations possibly giving rise to wrong interpretation. This manual is an integral part of the heating unit and must consequently be kept with care and must ALWAYS accompany the boiler even when passed on to another owner or user or transferred to another installation. Ask the Technical Assistance Centre for another copy if it should be lost or damaged.

a Children and people with disabilities or without expe-rience and specific knowledge are forbidden to use the heating unit unless they are assisted by a quali-fied person responsible for their safety.

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a It is forbidden to use electrical devices or equipment, such as switches, appliances, etc. if there is a smell of gas or un-burnt products. If so:

- ventilate the room, opening doors and windows; - close the gas valve at the mains; - immediately call in the Technical Assistance Centre

or professionally qualified personnel.

a It is forbidden to touch the heating unit with bare feet or parts of the body wet.

a It is forbidden to start on any technical or cleaning jobs before disconnecting the heating unit from the power mains.

a It is forbidden to alter the safety and adjustment devi-ces without permission and instructions from the hea-ting unit manufacturer.

a It is forbidden to obstruct the condensate drain. a It is forbidden to pull, detach, twist the wiring coming out of the heating unit, even if unplugged from the power supply.

a It is forbidden to obstruct or reduce the size of air vents.

a It is forbidden to expose the boiler to atmospheric agents (if it is not a specific unit for outdoors).

a It is forbidden to leave containers or flammable sub-stances in the premises where the boiler is installed.

a Do not dispose of packaging material into the envi-ronment, or leave it within the reach of children, since it can become a potential hazard. Dispose of packa-ging material in compliance with applicable legisla-tion.

a The user is forbidden to open the cupboard contai-ning the heating unit. Any jobs on the inside of the lat-ter must be done by the Technical Assistance Centre or by qualified personnel.

a It is forbidden to discard the product as household waste. At the end of its service life, it can be consi-gned to specific selected waste centres provided by the local authorities or else to dealers providing this service. Disposing of a domestic appliance separa-tely will prevent possible harmful consequences for environment and health derived from inappropriate disposal, likewise making it possible to recuperate the materials it is made of with substantial savings in energy and resources.

3 TECHNICAL FEATURES

3 .1 Main featuresPower Plus Box P INT-EXT is a condensing, modular, pre-mixed, blown, thermal group; it is made up of a series of Power Plus Box P INT-EXT thermal elements installed in bat-tery.A unit is made of N° 2, 3 or 4 heat exchangers, each with a modulating power from 23 ti 115 kW; equipped with cli-matic regulation and RS485 connection. Each device can be serially matched up with same tipe units up to a total installed power of 3680 kW (eight Power Plus Box P INT-EXT equal to a total of di 32 heat exchangers).

b In case of installation of more than 32 unit (up to 60 unit) please contact B Technical Assistance Cen-tre.

It is possible to connect up two thermal groups (with a total of 8 heat exchangers) directly using the internal 5” hydrau-lic manifolds and the internal 3” gas manifold.The efficiency of the generators reaches 109% based on the lower heat potential of natural gas (Hi) making it possi-ble to use a flue manifold entirely made of plastic (PP). The system also enables continual modulation of the gas and combustion air flow.The Power Plus Box P INT-EXT heating unit is the optimum as far as operating costs (up to 109% efficiency per Hi, see ) reliability and flexibility. In fact, thanks to the new heat exchanger with improved power, to the new electronic ma-nagement, to the modularity and versatility, it is possible to make a rapid connection to any kind of heating system and storage hot water production.

Figure 1

The insertion of a single thermal element in cascade, over the traditional rotation of the ignition, can take place with variable factor of heating power load, so that when a cer-tain power percentage of the first element is reached (e.g. 30%), the successive element already starts with the same load factor. This latter feature allows to share the power supplied inside more than one heat exchangers with a power/exchange surface ratio which is particularly favou-rable for condensation latent heat.

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3 .2 Advantages - Totally pre-mixed micro-flame jet burner; - condensing stainless steel exchanger, with efficiency

up to 109% (see ); - power from 23 to 115 kW ; - possibility to manage 32 thermal units (burners) in se-

ries for a maximum power of 3680 kW; - maximum exhaust flue exit temperature 80°C; - plastic flue manifold in PP self-extinguishing (see par

4.8): - water manifold, condensate and smoke manifold in-

side the boiler; - quick connection of both water, condensate and flue

manifolds (with exit on the right and left side); - weather temperature adjustment device supplied; - modulating and modular regulation of the single ther-

mal elements power; - automatic changeover (at adjustable time intervals)

of the burners ignition order;

b The changeover of ignition will work only at every start of the boiler. It's necessary that a room thermostat is connected, if it is replaced by a jumper the boiler is always on and it never changes the ignition order.

- choice of the cascade insertion criteria of the burner (power %);

- hot water and systems control at different temperatu-res, with or without function priority;

- automatic summer/winter switch-over; - anti-legionella mode (only available with remote con-

trol); - hour and week programming schedule (only avai-

lable with remote control); - minimum flow capacity of thermal carrier fluid control-

led by a differen-tial pressure switch;

3 .3 Safety devicesAll the functions of the thermal module are electrically con-trolled. Any anomaly causes the lock out of the single ther-mal element and the automatic shut down of the gas valve.The water circulation system includes:

- auto reset safety thermostat for each thermal ele-ment;

- safety water differential pressure switch for each ther-mal element;

- temperature probe on each thermal element flow and return. Probes are managed by an electronics homologated for safety performances and with a double processor technology. Such device allows to continually control both flow temperature and the Δt between flow and return of the battery element;

- modulating flow temperature regulation for both sin-gle elements and the whole battery.

The combustion system includes: - gas electro valve in B+C class for each thermal ele-

ment, with gas flux pneumatic compensation accor-ding to the inlet air flow ( air/gas 1:1 ratio);

- ionization electrode for continual flame control; - flue pipes temperature control for each thermal ele-

ment.

Protective actions and therefore closure of gas valves on each heating unit are activated in the following cases:

- flame burnt out; - over-temperature in exchanger system; - high temperature of exhaust fumes; - reduced air flow.

a The appliance must not be started up, even tempora-rily, where the safety devices have been mishandled or excluded.

b Safety devices must be replaced by the authorized Technical Assistance Centre only, exclusively using original parts.

3 .4 ComponentsPower Plus Box P INT-EXT is made up of a series of Thermal Units installed in battery placed inside a metal casing.Each thermal unit is connected to the system in parallel position as compared to the others, through a flow, return, gas, flue manifold and condensate discharge manifold.According to the heat demand, the regulation system swi-tches on and regulates the single thermal units in order to guarantee an optimal balance between power required by the system and power supplied by the boiler (see ).Each Power Plus Box P INT-EXT can be serially matched up with other similar boilers, even with different power, in order to make modular heating thermal plants made up of several “casings” which shall be hydraulic connected and controlled by a single modular boiler integrated inside each single unit.This regulation system has many advantages: maximum exploitation of the condensation technology, excellent mo-dularity of each single boiler and of the whole the battery ones, ratio of the system modulation equal to 1:157 in order to cover any power range from 23 to 3680 kW.All these features contribute to maximize the economy of the condensing boiler and to allow an excellent system-boi-ler matching.The ignition order of each single burner is fully managed by a microprocessor logic device which ensures an equal number of working hours to each thermal unit.

6

1

3

4

5

6

7

813

9

16

17

12

10

14EXHAUSTFLUE DUCT

GASCOMBUSTIBILE

SYSTEMINLET

SYSTEMOUTLETCONDENSATEOUTLET

15

11

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Figure 21 Heat exchanger2 Burner3 Pump (or 2-way valve)4 Smoke-exhaust flue non-return valve5 Jet6 Venturi tubes7 Gas valve8 Gas cock9 Water return cock

10 Water return manifold11 Gas manifold12 Gas pipe13 Condensate drain manifold14 Condensate drainpipe15 Flue Manifold16 Exhaust flue duct17 Water flow manifold18 Diff. Pressure switch

DIMENSIONS AND CONNECTION POSITIONS

Figure 3

7

SYSTEM COMPONENTS

10

14

24

16 17

1

2

3

4

7

8

11

12

19

22

23

13

5

6

9

15

18

20

21

Figure 41 Frame2 Control panel3 Exchanger4 Air inlet pipe5 Fan6 Return detection tap7 Pump (or 2-way valve)8 Unit Switch9 Return probe10 Exhaust flue probe11 Water differential pressure switch12 Gas valve

13 Ignition electrode14 Automatic vent valve15 Safety thermostat16 Gas cock17 Venturi tubes18 Flow probe19 Smoke outlet20 Gas manifold21 Water flow manifold22 Condensate manifold23 Water return manifold24 Smoke-exhaust flue non-return valve

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4 INSTALLATION

b Power Plus Box P INT-EXT heating units must be in-stalled in conformity to the latest provisions of the law and standards in force concerning heating units, condensing boilers and/or other applicable regula-tory provisions.

4 .1 Product packaging and identification

The Power Plus Box P INT-EXT heating unit is supplied, packed and protected by a strapped carton.

Figure 51 Boiler2 Control panel3 EC marking/Symbol cartouche4 Packaging5 Polyester corners6 Polyester protection panel7 Strap

Details of the product are written on the outside: model, power, version and type of fuel. Contact your local dealer in case of any differences with the order.Ensure the goods are intact and complete after unpacking them.

b Do not leave the packaging within the reach of chil-dren as it could be a potential source of danger.

The tag on the front side of the boiler’s electrical board, contains the following information:

- Product name - Serial number - Product identification code - CE certification number - Gas type and pressures from mains - Power type from mains - Rated heat capacity (Qn) - Rated working power (Pn)

- Efficiency according to 92/42/EEC Directive (η) - Max pressure and temperature (Pms) - Primary system (T) - NOx class (NOx)

Figure 6

a It is forbidden to remove or mishandle the identifica-tion plates, markings and any other making it difficult to safely identify the product.

4 .2 Installation premisesThe heating unit must be installed in premises used exclu-sively for the latter conforming to standards and legislation in force and where combustion exhaust products and com-bustion air intake is conveyed out of said premises. Where combustion air is instead taken from the installation premi-ses then the latter must be equipped with suitably sized vents conforming to standards.

b The space required to reach the safety and adjust-ment devices and to carry out maintenance must be considered. We recommend leaving a space of at le-ast 500 mm at the back of the appliance.

b Ensure that the degree of the heating unit’s electrical protection is compatible with the characteristics of the installation premises.

b Electrical parts must be placed at a height of no less than 500 mm from the ground where heating units are supplied with fuel gas with specific weight exceeding that of air.

b Heating units may not be installed out in the open (unless they are not specific outdoor units).

b The heating unit is equipped with a frost protection function, useful for installations where the temperatu-re of the environment could be below 0°C. Gas and electricity must be supplied for this system to work, apart from a correctly pressurized water circulation system and the system must not be in shutdown due to any type of error.

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4 .3 Water connectionsPower Plus Box P INT-EXT thermal modules are made up of 2, 3 or 4 thermal elements which are common to all the boi-lers belonging to the same family and they have a thermal power of 115 kW (Hi).The modules can be installed in cascade according to the power required by the installation and they can reach a ma-ximum of 32 thermal elements. The grouping of more than one module allows to make some noiseless thermal plants, with low thermal inertia and high power in a very simple and rational way. Each thermal module is equipped with the following connections which have been pre-set for the connection to the system (see table).

MANIFOLD DIMENSION REMARKSCON-

NECTION TYPE

upper water manifold 5” system inlet

Flanged manifolds for an easy con-

nection to the system

lower water manifold 5”

system outlet

gas manifold 3”

the gas inlet can be connected

simultaneou-sly to the two ends of the

boiler

condensate manifold 50 mm

connect to sewer system

See par. 4.6

Socked ends manifolds

for an easy realization of the flue

system using plastic pipes

(PP).

flue pipe (singol unit) 110 mm See par 4.8

4 .4 System cleaning and water treatment

This preventive measure is absolutely required whenever a heat generator needs to be replaced in but it is in any case recommended also on new systems, in order to remove any waste, dirt, working residues, etc.

To clean the system, if the old generator is still present in the system:

- add a descaling additive to the system water (contact the B Technical Assistance Centre);

- Have the system operate with the generator ON for approximately 7 days;

- Discharge the system’s dirty water and wash the sy-stem once or several times using clean water.

If the system is very dirty, repeat the last procedure one more time.

If the old generator is not present or available, use a pump to circulate the water + additive through the system for about 10 days and perform a final washing as described in the previous paragraph.At the end of cleaning operations, before installing boiler Power Plus Box P INT-EXT, it is advisable to add protection) to the system water (contact the B Technical Assistan-ce Centre);

a Please contact the B Technical Assistance Cen-tre for flushing out the water circuit inside the exchan-ger. Do not use incompatible liquid detergents, inclu-ding acids (e.g. hydrochloric acid and similar acids) at any whatsoever concentration.

4 .5 Positioning and preparation for installation

Follow the procedure below to install the thermal groups:1 After unpacking the boiler/s, establish the output di-

rection of the water, gas and condensate pipes (e.g.: left or right connection). Also establish the modality and the position of both the flue manifold and the eventual air manifold (in case of installation with outside air inta-ke). It is recommended to take into account the electric connections (230 V supply) of the thermal group too (see paragraph 6.2).

Please note that each pipes connection to the system can be indifferently made at the right of left side of the thermal group.

However, it is suggested to follow one of the schemes of installation reported on this manual (see chapter 5).

2 Place the thermal group/s near the inlet and outlet pipes of the system. The groups can be installed either with right or left outlet of water, air, smokes, condensate, gas pipes (e.g.: air inlet on the right, water outlet on the left, gas on the right).

The position of each Power Plus Box P INT-EXT inside the area of installation can vary according to specific requirements of space or to the type of the installation itself (e.g.: leaned against the wall, back-to-back, etc.); in any case, make sure that same necessary space is left for the passage of the electric supply cables of each Power Plus Box P INT-EXT and to let the front panel open. Space is also required in case of maintenance services of the flue, condensate, and gas pipes.

3 1.    Mount the side panels of the Power Plus Box P INT-EXT and connect the first (or the only) thermal group of the battery to the system, use the correct connections and carefully avoid any sudden variation of section among the piping of both the boilers and the system. If necessary, adjust the boiler’s feet height to level the frame of the boiler and to open the doors easily.

4 2.      Once water connections between the first group and the system have been made, connect successi-vely the other eventual thermal groups to the first one, following the advice above. Use sections male/male Ø 50 mm of about 13 cm lengths to connect the different condensate discharges.

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4 .6 Condensate outletThe condensate water produced by Power Plus Box P INT-EXT a normal running conditions is evacuated into a spe-cial manifold.

Drainage must be done at atmospheric pressure, i.e. by dripping into a connected drain-trap, as follows:

- install a drip at the condensate drainage manifold; - connect the drip to the sewerage mains by a drain-

trap; - be ready to use a neutralizer where required (see

project cig E.01.08.929.0; ATV A 115).

There is generally no need to take any special precautions for draining condensate.We advise using plastic (PP) piping for building the con-densate drainage.

a DO NOT for any reason use pipes in copper or in any other material not specifically used for this particular scope, as the condensing action could cause rapid degradation.

(*)

(*)

i > 3%

i i ≥ 3°

Condensate collector

(*) Fill the siphons with water.

(at atmospheric pressure)

Civil drain

minimumdistance300 mm

minimumdistance

10 mm

Fig. 7

Furthermore, should the vertical part of the flue exhaust duct have to be prolonged by more than 4 metres the con-densate drain-trap will have to be placed at the foot of the piping. The working height of the drain-trap must be at le-ast 30 cm. The drain-trap outlet must then be connected up to the sewerage mains.

b The condensate drain must be connected to the sewerage mains in such way as to prevent it from being frozen under any circumstances.

b Always install a condensate drain in the exhaust flue duct at no more than 1 m from the boiler

4 .7 Water circuitWORKING PRESSUREThe maximum working pressure of the boiler is 6 bar (600 kPa) whilst the minimum is 0.5 bar (50 kPa).

b It is compulsory to install devices along the topping up/supply line as well as the water circulation system to protect the installation from pressures exceeding 550 kPa, in conformity to prescriptions given in the EN 60335-2-102.

b Do not expose the exchanger to cyclic changes in pressure as fatigue stress does a lot of harm to the system components. Should the water system sud-denly start generating changes in pressure it is com-pulsory to use the protection devices to make the boiler work at a regular pressure.

b Installation pressure control must be done under cold conditions.

FILLING UP THE BOILERThe boiler must be filled up by connecting the water from to the mains to any part of the installation.

b It is compulsory to use a standard filling device (EN61770 type) for coupling up to the mains specifi-cally preventing the back-flow of liquid from installa-tion to water mains.

EMPTYING THE BOILEREmptying of the system is made by acting on the dischar-ge valves of each unit and in some points of the hydraulic system specific for this purpose.For more information on the characteristics of hydraulic sy-stem see Chapter 5 in which different types of plant are shown.

4 .8 Exhaust flueThe chimney should be as straight as possible, sealed and isolated. Should not have occlusions or narrowing.

b The overall potential of thermal groups Power Plus Box P INT-EXT Series is more than 35 kW, so they can be installed only in rooms that have venting opening to the outside according to actual law (italian D.M. 12.04.1996).

b The Power Plus Box P INT-EXT series generators must be connected to a exhaust pipe system in flame retar-dant polypropylene (PP) or suitable materials accor-ding to UNI EN 677 and associated standards.

a DO NOT for any reason use piping not specifically designed for this specific scope as the condensing action could cause rapid degradation.

b Where collectors are used to evacuate the smoke, the presence of non-return valves within each unit stops the products of combustion of the active units entering the boiler room by means of the closed unit intake ducts.

a In the event of installation with air intake from the pre-mises (both in the heating unit and externally) avoid obstructing the passage of air under the metal cup-board.

11

If you decide to bring together in one manifold the dischar-ges of each unit, the diameter of the pipe to be used for one or two units Power Plus Box P INT-EXT series connected in series is Ø200 mm (see ). For cascade installations whe-re there are more than two machines the diameter of the exhaust manifold must be properly sizing, or simply con-nect up to two Power Plus Box P INT-EXT using multiple lines Ø200 separated.

Maximum Pipe Length (m)Installed power

(kW) with Ø 160 with Ø 200

230 60 -345 60 -460 40 60575 25 60690 - 60805 - 55920 - 401035 - 351150 - 25

Figure 8

5 INSTALLATION DIAGRAMSAn installation diagram must generally be adapted to the manufacturing characteristics of the relevant heating unit, with the purpose of exploiting the boiler potentials to the full and maintain the entire installation efficient for as long as possible.

The is shown an installation without a mixing element, in is shown a installation with a mixing element.

Figure 9

Figure 10

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6 ELECTRICAL SYSTEM

6 .1 Power supplyA detailed wiring diagram of the heating unit is shown in caption 11, at the diagram and technical data section.Installation of the heating unit requires connection to a 230V - 50Hz grid system and must be done with good wor-kmanship in conformity to the electrical regulatory provi-sions in force.It is best to install a differential circuit-breaker switch along the line supplying power to the boiler.

b Adapters, multiple sockets, extensions to feed the appliance are not allowed.

The thermal generator must always be connected to the "master board" which contains the board that governs the system and manages probes of the circuit, pumps and ac-cessories.The is shown the terminal of the master board, with the connections to different external devices.

b Always check the effectiveness of the electricity ear-thing system, compulsory for the appliance and used for connecting up to the heating unit. The electroni-cs could in fact put the entire heating unit into safety shutdown should the latter not be compatible.

b Make sure that the water and heating pipes have not been used as earths for the electrical installation. They are absolutely unsuited for this usage.

Wiring at a voltage of 230 V must be separated from those at a voltage of 24V, using raceways or separate PVC tubes.Make sure that the electrical features (volt, absorption, starting current, etc.) of the external electrical components (thermoregulators, solenoid valves, weather probes, etc.) are compatible with the inlets and outlets available before connecting them up.Relays and/or ancillary contactors are to be used to con-nect up the external electrical components, which must be installed on a special electrical board externally.This solution also enables circulators, valves, etc. to fun-ction in emergency mode, i.e. should the boiler master bo-ard not be serviceable.

a Do not touch the electrical apparatus with parts of the body wet or damp or with bare feet.

a Do not leave the appliance exposed to atmospheric agents (rain, sun, wind, etc.) unless it is the special model for out of doors.

a It is forbidden to pull, detach, twist the wiring coming out of the heating unit, even if unplugged from the power supply.

a Do not allow people without experience to use the appliance and switch off the heating unit if the power cable should break; call in qualified personnel to re-place it.

Always refer to the data given in the diagrams in this hand-book for operations of an electrical nature.Remember that B is not to be held liable for any dama-ges caused by ignoring the information given in the wiring diagrams of this manual.

a Never turn off the boiler while it is functioning nor-mally (with burner ignited) suddenly cutting off the power supply with the on-off switch. This could cause abnormal overheating in the primary exchanger. Use a room thermostat or remote control to turn off (whilst heating system is on).

6 .2 Electrical connections b Qualified personnel only may work on the electrical

system and in compliance to provisions of the law, with particular attention to rules on safety.

a Lock the cables in their cable clamp designed to en-sure the latter are always in the correct position inside the appliance.

6 .2 .1 Connection to mainsWhen installing a single Power Plus Box P INT-EXT Series the connection must be made in accordance with current regulations regarding electrical safety, using a multi shea-thed cable H05 VV-F-3GI with minimum section of the con-ductors of 1,5 mm2, suitably protected against moisture, abrasions and incidental contact.The power cord is to be connected to the switch, located behind the boiler control panel. To access the switch, re-move the protective sheet metal by removing the screws connecting. The protective conductor (earth) terminal is to be connected to the general earth strip next to the switch.Fix the cable by its cable clamp and supplied anchorages to ensure it is correctly in place inside the appliance and to prevent it from coming into contact with parts at high temperatures (burner, etc.).

b The length of the grounding cord should be higher than other conductors (phase, neutral). In case of di-sconnection of the power cord the cables of the con-ductors are strained before the grounding one.

b The rubber cableguides placed on the structure of the equipment have not to be removed because their purpose is to protect the cables from wear that occurs in direct contact between cable and frame equipment. To pass a cable is sufficient to drill the cableguides.

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6 .2 .2 Master board connectionFollow the instructions reported on the previous paragraph in order to connect the Master Board independently to the electricity network. The Master Board needs to be con-nected to the related equipment (or to the equipment bat-tery) by means of a special Bus connection with bi-polar cable (cable not supplied).Use a H05-VV-F-3GI sheathed cable to make the con-nection. The minimum section size of the cable conductors needs to be of 0,5 mm2 (with adequate length). Connect one side of the bi-polar cable to the mounting jig that is placed on the Master board (see arrow, ) and connect the other side of the cable inside the boards panel that is pla-ced inside the equipment.The shows the left jig placed next to the equipment switch on button (The connection can me made also to the right jig; see ). Use the same jigs shown on and in case you need to connect more than one equipment (see paragraph 6.4.2).

Figure 11

Figure 12

Figure 13

As largely detailed on the following paragraphs, inside the Master board you will find the auxiliary devices jigs ( e.g. pumps, probes, mixing-valve, etc…).Remove the DIN guide (placed inside the Master Board) to access the mounting jig.Unscrew the two screws on the DIN guide as indicated on . Once unscrewed the two screws, remove the Din bar to fully access the jig inside the Master Board (see .

Figure 14

Figure 15

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6 .2 .3 Connection to thermoregulatorsPower Plus Box P INT-EXT heating units are equipped with an extremely versatile control and operating system, able to operate three independent systems functioning at dif-ferent temperatures. The procedure for connecting up the output signal to the specific points on the terminal board will be illustrated in the following pages (see ).H05-VV-F type cables with minimum external diameter of 5mm and adequate conductor section may be used for thermoregulation and low voltage systems, being careful to fix the latter to their cable guides.

6 .2 .4 Connection to pumpsPower Plus Box P INT-EXT regulation system includes the simultaneous management of up to three circulators.

b Therefore, if a low temperature circuit supplied by its own circulator is present and a general pump is to be installed on the system, it will be necessary to choose which one of the two devices should be managed by the system's electronics.

This operation is done by a Technical Assistance Centre authorized by B during commissioning the system, by setting an appropriate parameter (specifically n. 34 in the list of parameters).

b The pumps and others external components have to be installed using an adequate relay/commutator, as shown in .

Use a H05-VV-F type cable with minimum external diame-ter of 6 mm and adequate conductor section to connect the terminal board to the relay (to be housed in a special exter-nal board), being careful to fix the latter to its cable guide.

For example, by connecting the low temperature circulator to a timer and/or external room thermostat the electrical in-stallation will be the one shown in . By this system is possi-ble to power on circulators (external devices) directly from the network with no electrical load passing through the fuse of the board.Moreover, in case of emergency mode, the manual device 0, 1, AUTO controls the operation of the pump regardless of what the board. For these reasons it must explicitly pro-vide for the use.Use a bi-polar cable of the power cable sort (unless otherwi-se recommended by the component’s manufacturer.

6 .2 .5 Connection to room thermostats (on/off)

Connect up the high temperature system room thermostat to terminals 9. and 10 ().The thermostat for the low temperature system must inste-ad be connected to terminals n. 11 and 12 ().

6 .2 .6 Connection to weather temperature probe

If you want to use a weather thermoregulator, the external probe (optional) must be connected up to terminals n.7 and 8 (). The external probe must be placed on an outer wall facing north to north-east at a height of at least 2.5 me-tres and at a distance from windows, doors and air vents.Protect the probe from direct exposure to the sun. Contact the Technical Assistance Centre authorized by B if the curve has to be adjusted or the weather function excluded.

Figure 16

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Figure 17

Initials Jumper N. Description

S1 J11 (1-2) Flow temp. probe (HT)

SB J11 (3-4) Water tank temp. Probe

S2 J11 (5-6) Flow temp. probe (LT)SE J11 (7-8) External temp. Probe

T2 J12 (9-10) Room thermostat (HT)T2 J12 (11-12) Room thermostat (LT)

AI J12 (13-14) 0-10V analogic deviceCR J12 (15-17) Remote controlAL J8 (18-19) Alarm signalVM J9 (20-22) Mixer valveP4 J10 (23-24) LT system circulatorP1 J10 (25-26) HT system circulatorP2 J10 (27-28) Hot water circulator

Figure 18

Correspondence table for all sensorsMeasured temperatures (°C) - Resistive values of the sensors (Ω).

T (°C) R (°Ω) T (°C) R (°Ω) T (°C) R (°Ω) T (°C) R (°Ω) T (°C) R (°Ω) T (°C) R (°Ω) T (°C) R (°Ω)- 20 67739 - 1 28481 18 13062 37 6470 56 3426 75 1925 94 1137- 19 64571 0 27279 19 12565 38 6247 57 3319 76 1870 95 1108- 18 61568 1 26135 20 12090 39 6033 58 3216 77 1817 96 1079- 17 58719 2 25044 21 11634 40 5828 59 3116 78 1766 97 1051- 16 56016 3 24004 22 11199 41 5630 60 3021 79 1717 98 1024- 15 53452 4 23014 23 10781 42 5440 61 2928 80 1669 99 998- 14 51018 5 22069 24 10382 43 5258 62 2839 81 1622 100 973- 13 48707 6 21168 25 9999 44 5082 63 2753 82 1577 101 948- 12 46513 7 20309 26 9633 45 4913 64 2669 83 1534 102 925- 11 44429 8 19489 27 9281 46 4751 65 2589 84 1491 103 901- 10 42449 9 18706 28 8945 47 4595 66 2512 85 1451 104 879- 9 40568 10 17959 29 8622 48 4444 67 2437 86 1411 105 857- 8 38780 11 17245 30 8313 49 4300 68 2365 87 1373 106 836- 7 37079 12 16563 31 8016 50 4161 69 2296 88 1336 107 815- 6 35463 13 15912 32 7731 51 4026 70 2229 89 1300 108 796- 5 33925 14 15289 33 7458 52 3897 71 2164 90 1266 109 776- 4 32461 15 14694 34 7196 53 3773 72 2101 91 1232 110 757- 3 31069 16 14126 35 6944 54 3653 73 2040 92 1199- 2 29743 17 13582 36 6702 55 3538 74 1982 93 1168

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6 .2 .7 Frost protectionThe heating unit electronic control includes a frost pro-tection function. When the flow temperature sinks to below a minimum value, the burners start working at minimum power according to the procedure used to set the functio-nal parameters.The frost protection mode is activated even if the external probe (supplied with the appliance) is not connected to the boiler: parameters 14 (related to the Ch1 high temperature system) and 22 (Ch2 low temperature system) are in fact in default and set in weather function.Should one not want to connect the probe, the boiler must be made to work at a fixed point to avoid problems. The parameter 14 and 22 settings may only be altered by a Technical Assistance Centre authorized by B.

b Power and fuel gas supply must be activated and the water system at a correct pressure for the frost pro-tection system to function.

Glycol can be used as an additive for the system (up to a maximum of 50%) there where considered necessary by the person responsible for the project, keeping in mind that this substantially reduces efficiency as it alters the specific heat of the fluid.Furthermore several parts of the system could be dama-ged by altering the pH.

6 .2 .8 Connection to 0-10v external thermoregulator

An external thermoregulator connection using a 0 – 10 v signal could be used by connecting the output signal to terminals n.13 and 14 ().

b The positive pole of the signal output must be con-nected to terminal 13 for the device to work correctly.

6 .2 .9 Connection to alarm deviceA beeping or visual alarm device, to signal any technical faults, may be connected outside by a special output with clean contact on the boiler terminal board.The alarm device must be connected to terminals n.18 and 19 ().

6 .2 .10 Remote controlIf the remote control is to be used, it must be connected to terminals no. 15, 16 and 17 (.

6 .3 Emergency modeThe Power Plus Box P INT-EXT electronic control system in-cludes a functional mode called “Emergency”, which can be activated in case of a Master board malfunction.The master board can in fact be excluded so as to enable the system to work with a flow temperature preset in defau-lt by the manufacturer, guaranteeing the heating unit with continual service.

b Qualified personnel only may work on the electrical system and in compliance to provisions of the law, with particular attention to rules on safety.

The following procedure must be adopted to enable the “Emergency” function:

- Disconnect the 4-pole J14 connector from the master board (see );

- set all four J17 switches located on each Slave of the thermal assembly on the Off position ();

- Supply power to all the circulators in the system di-rectly from the mains using the specific relays/chan-ge-over switches;

- Connect terminal X1 or terminal X2 (which are part of the J14 connector wiring disconnected during the first step of this procedure) to a 24 V ac power supply (see ).

b If several Power Plus Box P INT-EXT are installed in series, one of the two terminals (X1 or X2) or both may be connected to the adjacent thermal group or groups. If this is the case, supply the free terminal with 24 V, (see par 6.4.2).

Figure 19

Figure 20

17

Figure 21

6 .4 Cascade installation

6 .4 .1 Connection to mainsEach module (boiler) must be electrically powered. The connection must be made in accordance with current regu-lations regarding electrical safety, using a multi sheathed cable H05 VV-F-3GI with minimum section of the conduc-tors of 1,5 mm2, properly protected against humidity, abra-sions and accidental contacts.The electric connection has to be made for each module as described in paragraph 6.2.1.

6 .4 .2 Serial Connection (BUS)All battery equipments need to be connect to each other via bus. Use a H05-VV-F-3GI sheathed cable (not inclu-ded) to make the connection. The minimum section size of the cable conductors needs to be of 0,5 mm2 (with ade-quate length). Use the jigs placed inside the boards rack to connect the equipments in a battery (see and .Please note that the BUS connection is not poled hence it is not needed to respect the same polarity on the con-nections.Employ the rubber cable runner to make the cables go from one equipment to the other (see .

b The rubber cableguides placed on the structure of the equipment have not to be removed because their purpose is to protect the cables from wear that occurs in direct contact between cable and frame equipment. To pass a cable is sufficient to drill the cableguides.

Once the connection has been made, all the unit of the battery will be as follows:

- electrically powered; - connected to each other through a serial wiring; - connected to the probes, to the pump and to the ma-

ster board.In order to complete the electric installation, select address for each slave as show in the paragraph for “slaves boards settings” (see par 7.1).

Figure 22

6 .5 Position of the flow probeEach unit upper water manifold is equipped with two pockets where the temperature probe has to be inserted. The latter probe continuously checks the flow temperature of the heating circuit.Either you are installing a single unit or a battery of them, the flow probe must always be installed inside the pocket placed downstream.Of course, in case of more than one unit in battery, the pro-be must be inserted in the pocket placed downstream on the unit closer to the system inlet, as it is shown in .The temperature difference read by the probe causes igni-tion, switching off and modulation of all the thermal elemen-ts in cascade. Installer shall take care to place the probe inside the pocket which is closer to the system inlet, in ac-cordance to the water stream.

Figure 23

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7 FIRST OPERATINGTo complete the start-up of the boiler, the following opera-tions are necessary, that should only be performed by an authorized Service B:

- verification of the installation; - slave board setting - combustion analysis.

7 .1 Slave board settingThis operation that should only be performed by an autho-rized Technical Assistance Centre B.Each slave unit that composes the system should be iden-tifiable from the only master board, through an address that is assigned properly configuring the switches J10 and J17, on each slave battery. Each slave (one for each burner) needs to be properly configured so that the Master board shall detect their right sequence.The slaves are divided into blocks of four slave each (every Power Plus Box P INT-EXT is a block) and the system can handle up to 15 blocks.Therefore, the address configuretion is done for each slave using the following procedure, always remembering that a block is equivalent to a unit:

- locate the block the slave is related to (ex. block n°1, n°2, etc., till block n°15);

- locate the slave position inside each block (e.g. po-sition1,2,3 or 4);

- supply each Power Plus Box P INT-EXT composing the battery (see par.6.4.1).

b Qualified personnel only may work on the electrical system and in compliance to provisions of the law, with particular attention to rules on safety.

As shown in to set the address of the block you should work on the switch located on the right (Jumper J17) and for each slave (single burner) on the Left one (Jumper J10).

Figure 24

Refer to the table to see the possible combinations of the jumpers J10 that characterize the four slaves (n 1, 2, 3 and 4) of the same block.

JUMPER J10 SLAVE AD-DRESS1 2

OFF OFF 1OFF ON 2ON OFF 3ON ON 4

Following table shows the possible combinations of the jumpers (J17) we have the settings for the maximum (15) number of block.

JUMPER J17 4 UNITS BLOCK(unit)1 2 3 4

OFF OFF OFF OFF EmergencyOFF OFF OFF ON 1° blockOFF OFF ON OFF 2° blockOFF OFF ON ON 3° blockOFF ON OFF OFF 4° blockOFF ON OFF ON 5° blockOFF ON ON OFF 6° blockOFF ON ON ON 7° blockON OFF OFF OFF 8° blockON OFF OFF ON 9° blockON OFF ON OFF 10° blockOFF OFF ON ON 11° blockON ON OFF OFF 12° blockON ON OFF ON 13° blockON ON ON OFF 14° blockON ON ON ON 15° block

The data have to be used regardless of the number of units present: if, for example, have 6 blocks in the battery we will consider combinations until the line corresponding to the 6th block, and not beyond.In the following part is an example of configuration of a battery with seven burner in cascade.

7 .1 .1 Example of configuretion of a battery with 7 burner in cascade

In case two blocks are present in an installation having a battery of seven burners (i.e. seven slaves): the first is made of 4 burners and the second is made of 3. As a con-sequence, two blocks need to be configured, respectively with address 1 and 2 and with relative burners, to the first block with address 1,2,3 and 4, and to the second block with address 1,2 and 3 (see ).

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Figure 25

7 .2 Gas valve calibration b Gas valve calibration jobs must be done by the Te-

chnical Assistance Centre authorized by B only.The procedure for calibrating the gas valve is given here below:

- place the exhaust flue probe of the combustion analy-zer into the socket on the clapet;

- make sure there is demand from the two room ther-mostats. In case of problems with starting up the bur-ner after the ignition cycle, turn the adjusting screws anti-clockwise by about 1 turn at a time;

- take the burner to maximum power from the control panel by pressing key ”SET/ESC” and together for 5 secs. This will make it possible to select max. speed with the (par. nr.15). All the fans in the system will work at the set speed; this will be displayed on the first digit to the left. H = maximum speed. The other 2 digits will show the flow temperature (e.g.: T1=80°C);

- Adjust combustion by the screws shown in until re-aching the rated CO2 value, (see table), turning the screws clockwise to reduce the value;

- N.B. Turn anti-clockwise to increase the gas flow ca-pacity and clockwise to reduce it;

- leave the boiler to run regularly at maximum power, then adjust calibration if necessary;

- take the burner to minimum power, pressing key ; - the letter “L” (Low=, the boiler will go to minimum

power) will appear to the left on the display; use the gas valve offset adjusting screws (see ) to reach the ideal values given in the following table.

GAS MAX CAPACITY MIN CAPACITYNatural gas CO2 = 8.9 - 9.1 CO2 = 8.9 - 9.1

Figure 26

Figure 27

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8 USE AND ADJUSTMENT

8 .1 Control panel: descriptionThe Power Plus Box P INT-EXT digital Master control panel of the Power Plus Box P INT-EXT is located in the external ca-binet. It is possible to operate on the master contro.l panel opening the cover with the plexiglass window. The various buttons on it allow you to perform a variety of functions ran-ging from simple monitoring of the main parameters to the system configuretion of the device depending on the type of plant which is located downstream of it.

The control panel was designed to enable the user to enter the various user modes; each one of these has a set of corresponding functions, activated by pressing a button or combination of two buttons pressed together. Furthermore, each button has a specific function depending on the se-lected user mode.

Figure 28

BUTTON KEY DESCRIPTIONS1 Reset button Serves to release the electric board after a permanent arrest

S2 Set/esc button Press to enter parameter mode and monitor mode for individual unitsS3 System selection button Press to visualize functional status of the various master systemsS4 Increase button Press to increase a specific valueS5 Reduce button Press to reduce a specific valueS6 Confirmation button Press to memorize new valuesU2 Illuminated display Displays information on boiler statusU3 Illuminated display Displays information on boiler statusD4 Green led If on, it indicates the system is liveD5 Red led If on, it indicates a possible fault

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8 .2 Display modeThe red led, D5, lights up in the event of faults implying permanent arrest of a unit. If so the only way to restore normal working conditions is to reset the master or slave.The green light, D4, shows that power from the mains is ON. The 3 digits at 7 segments visualize:

SYSTEM STATUS DISPLAY

No demand for heating or hot water.The two right hand digits display flow temperature T1. E.g. T1 = 30°C

Demand for 1st system or 1st and 2nd system simultaneously.The two right hand digits display flow temperature T1. E.g. T1 = 80°C

Demand for hot water or simultaneous functioning.The two right hand digits display flow temperature T1. E.g. T1 = 80°CThe point after the first digit flashes.

Demand for 2nd system.The two right hand digits display flow temperature T1. E.g. T1 = 80°C

Frost protection mode ON.External probe is disconnected (see also Par. 6.2.7) 1001 INT-EXT

8 .3 Visualization of temperature and functional status of the various systemsPress button to visualize the values related to individual systems and the values listed below will appear in succession.

POS. VISUALIZED VALUES DISPLAY

1 Flow temperature high T1 system(e.g. T1 = 80°C)

2 Hot water T3(e.g. water tank temp. = 50°C)

3 Outside temperature T4(e.g. T4 = 7°C)

4 Flow temperature 2nd system or low T6 system

5 1st system room thermostat off or on(e.g. OFF = contact open; ON = contact closed)

6 2nd system room thermostat off or on(e.g. OFF = contact open; ON = contact closed)

7 0-10V analogue input(e.g. 5.5V ; 10V respectively)

8 Mixer valve function status(e.g. OFF)

9 Principal circulator function status.(e.g. circulator OFF; circulator ON respectively)

10 Function status hot water system circulator.(e.g. circulator OFF; circulator ON respectively)

11 Second circulator function status(e.g. circulator OFF; circulator ON respectively)

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8 .4 User parameter changeThe three user parameters can be altered from the “functional values visualization” mode:

- Setpoint high T heating system; - Setpoint hot water system; - Setpoint low T heating system.

Follow the procedure given below to change one of the three above mentioned values:Pressing button the values listed below will appear respectively:

- T_flow_high T. heat. system (pos.1); - T_hot water (pos.2); - T_flow_low T. heat, system (pos.4).

Press button ”Set/esc”: the relative value will appear and the two right hand digits will flash.If the value need not be altered, press ”Set/esc” again to return to display mode.If the value has to be altered, press and as far as the desired value, shown on the display. Press ”OK” to memorize the new value. The value on the display will stop flashing and the display will go back to display mode again.

For example’s sake here below is a table showing the procedure for changing the setpoint value of the low temp. heating system from 50 to 40°C.

POS. PROCEDURE DISPLAY

1 E.g. value read on display for high system 80° C

2 Press button to enter display mode, press again and go to the first of 6 digits to visualize the set value (e.g. 50° C)

3 Press button ”Set/esc”

4 Press to take the setpoint to the desired value (e.g. 40° C)

5 Press ”OK” to memorize the new value

6 After 3 secs. the display will return to the display mode with the new setpoint

If there is no change after pressing ”Set/esc” for 10 secs. (the desired value corresponding to the set one) the display returns to display mode function.If there is no operation after pressing buttons and , after one minute the display will return to display mode. The new selected value is not memorized.

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8 .5 Monitor modePress ”Set/esc” to enter monitor mode.This is used to control or visualize the functional status of the individual units (addresses from 1 – 6). The following proce-dure shows how to enter monitor mode.

POS. OPERATIONS DISPLAY

1 From current T1 position at 80° C

2 Press ”Set/esc” for 5 secs. The displays shows it is possible to read the values or functional status of unit 1

3 Press or to scroll and read the values of the desired unit (e.g. fig., unit 19)

4Pressing the first value of the selected unit will appear. Afterwards by pressing the

same button the next values will be visualized.(e.g. fig., 1st value – flow temperature NTC 70° C).

5 Press ”Set/esc” to exit monitor mode. The display will return to display mode function if it is not pressed within 5 minutes or if no operation has been done.

The following values for each single unit can be visualized with :

POS. DIMENSIONS DISPLAY

1 Flow temperature (e.g. 70° C)

2 Return temperature (e.g. 50° C)

3 Exhaust flue temperature (e.g. 60° C)

4 Ionization current (index from 0 to 99).E.g. fig. Ionization current index 44.

5 Fan PWM signal (%).If PWM = 100%, it corresponds to 99 on the display. E.g. fig. with 66%.

6 Flowmeter contact open and closed (e.g. fig. contact open then contact closed)

7 Circulator or motor-driven valve individual unit on/off.(e.g. fig. circulator on then circulator off)

8 Maximum ionization current (range from 0 to 99) at first attempt.E.g. fig. Maximum ionization current value on display 80.

9Hours worked by unit (from 0 to 9999 hours)

E.g. fig. 8050 hours: first thousands and hundreds then tens and units will appear in succession and coupled on the display

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9 ADJUSTING THE FUNCTIONAL PARAMETERSThe heating functions can be set for the high temperature, low temperature and DHW circuits based on the system requi-rements by setting the functional parameters.The first three parameters can be accessed on the user level. The next three require a password (“22”, see the "INSTAL-LER PROGRAMMING mode" chapter in the "User interface" chapter.

To access the user parameters, press the button, and the following values will be displayed in order: - manifold delivery temperature T1 - DHW temperature T3 - low temperature circuit delivery temperature T6.

To change the relative setpoints: - press the “Set/esc” button: the relative value will appear, the two digits on the right will flash - press and until obtaining the required value. Press “OK” to save the new value. The displayed value will stop

flashing after 3 sec and will be operative.

A detailed description of all the parameters and the factory preset values can be found in the "Parameter list" chapter.

9 .1 Setting the heating parametersThe following heating parameters can be set:

1 Setpoint_T_CH_High High temperature circuit setpoint (parameter 1)If the "fixed point" operating mode is set (par. 14=CH_type_high=0), it is the target temperature.If the "climatic control" operating mode is set (par. 14=1) , it is the maximum target temperature with minimum outdoor temperature (T_out_min=par. 37, preset to 0°C).parameter 18 (T_ch_high_foot, preset to 50°C) defines the minimum setpoint at maximum outdoor temperature (T_out_max=par. 38, preset to 18°C).

Preset to 70°C and upper value limited by par. 17 (T_ch_high_limit, preset to 80°C).

T_out_max

External temperature (°C)

Del

iver

y te

mpe

ratu

re (°

C)

100

90

80

70

60

50

40

30

20

10

025 20 15 10 5 0 -5 -10 -15 -20

CLIMATIC CURVEHIGH TEMPERATURE circuit

T_CH_High

Max heatrequirement

T_CH_High_foot

T_out_min

Fig. 29

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2 Setpoint_T_CH_Low Low temperature circuit setpoint (parameter 3)If the "fixed point" operating mode is set (par. 22=CH_type_low=0), it is the target temperature.If the "climatic control" operating mode is set (par. 22=1) , it is the maximum target temperature with minimum outdoor temperature (T_out_min=par. 37, preset to 0°C).parameter 24 (T_ch_low_foot, preset to 25°C) defines the minimum setpoint at maximum outdoor temperature (T_out_ma-x=par. 38, preset to 18°C).

Preset to 40°C and upper value limited by par. 23 (T_ch_low_limit, preset to 50°C).

T_out_max

External temperature (°C)

Del

iver

y te

mpe

ratu

re (°

C)

100

90

80

70

60

50

40

30

20

10

025 20 15 10 5 0 -5 -10 -15 -20

CLIMATIC CURVELOW TEMPERATURE circuit

T_CH_Low

Max heatrequirement

T_CH_Low_foot

T_out_min

Fig. 30

Therefore, it is possible to work with a fixed point or set a climatic curve on every circuit.

3 CH_Priority Heating priority (parameter 16)If set to 0, the system will work without heating priority with the high temperature and low temperature circuits served in parallel.If set to 1, the demand from the low temperature circuit is ignored and the relative pump remains off. The low temperature circuit demand is only accepted when the high temperature circuit demand is inactive. Vice versa, if set to 2, the low temperature circuit has priority.

Preset to 0.

9 .2 Setting the DHW parametersThe following DHW parameters can be set:

1 Setpoint_DHW DHW setpoint (parameter 2)This is the production temperature for DHW.The maximum limit is indicated by par. 8 (T_DHW_limit, pre-set to 60°C).

Preset to 50°C.

2 DHW_Type Boiler type (parameter 6)0 = No DHW service1 = Quick exchanger with sensor2 = Boiler with sensor6 = Boiler with thermostat

In the case of a boiler with a thermostat, if the input is a clo-sed contact, the DHW demand is activated, if it is an open contact the demand stops.

Preset to 0.

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3 DHW_Priority DHW priority (parameter 9)

0 = Shifting priority AThe purpose of shifting priority function A is that the system can also serve heating if the heating demand is low.The system responds to the heating demand if:(Setpoint_Ch - 50°C) < Temp_collettore < (Setpoint_Ch + 1°C)Setpoint_Ch = Setpoint of the high or low temperature cir-cuit depending on demand.

1 = Shifting priority BThe purpose of shifting priority function B is that the system never stops the heating service for too much time.The system responds to the heating demand if:(Setpoint_Dhw+T_Tank_extra) - 50°C < Temp_collettore < (Setpoint_Dhw + T_tank_extra) + 1°CT_tank_extra = Par. 10 = preset to 30°C.

2 = Absolute priority (only DHW service)

Preset to 0.

9 .3 Heat control setting1 Attenuation_High HIGH TEMPERATURE circuit attenuation function

(parameter 21)There are 2 cases:

- Fixed point operation Par. 14=0 - Operation with climatic control Par. 14=1.

FIXED POINT OPERATION, PAR. 14=0With the high temperature circuit attenuation disabled, Par21=0 when the high temperature circuit thermostat is closed, the heating demand is activated. When opened, the system turns off.

The Master control unit activates the high temperature cir-cuit pump PZ1 and the system pump PZ2 (if parameter P34=0).

On the Master control unit it is possible to set the high tem-perature circuit setpoint, Setpoint_T_CH_High = Par. 1, pre-set to 70°C and settable from 10°C to T_CH_high_limit=Par 17, which is in turn preset to 80°C. The setpoint used will be the one set with parameter 1.

The burner is on when:Manifold temperature =Setpoint + shut-off hysteresis .Shut-off hysteresis can be set (CH_High_Hyst_off=Par. 20, preset to 3, can be set between 0 and 20°C).

With the high temperature circuit attenuation parameter, Par. 21≠0, the high temperature thermostat contact is igno-red and a heat demand is present for the high temperature circuit when:Manifold temperature =Setpoint + shut-off hysteresis .The setpoint in this case coincides with the value set for parameter 1 (Setpoint_t_ch_high) if the high temperature thermostat contact is closed, whereas it is calculated as the value set for parameter 1 less the attenuation (Setpoin-t_t_ch_high-Attenuation_high) if the contact is open.

OPERATION WITH CLIMATIC CONTROL, PAR. 14=1If the high temperature circuit attenuation is equal to 0 , At-tenuation_high=Par. 21=0, its behaviour is the same as the previous paragraph, with the exception that the setpoint is calculated based on the outdoor temperature.

If the outdoor temperature = Tout_min=Par. 37, preset to 0°C, then setpoint =setpoint_T_Ch_high.If the outdoor temperature = Tout_max=Par. 38, preset to 18°C, then setpoint T_ch_high_ foot=Par. 18, preset to 50°C.The setpoint is calculated linearly between the 2 outdoor temperature values.

Preset to 0.

2 Attenuation_Low LOW TEMPERATURE circuit attenuation function

(parameter 25)This paragraph is similar to the previous paragraph for the low temperature circuit.

There are 2 cases: - Fixed point operation Par. 22=0 - Operation with climatic control Par. 22=1.

FIXED POINT OPERATION, PAR. 22=0With low temperature circuit attenuation disabled, Par. 25=0 at the closure of the low temperature circuit thermo-stat, heating demand is activated. When opened, the sy-stem turns off.The Master control unit activates the low temperature cir-cuit pump if the parameter for the third pump is set to 1 (P34=1).On the Master control unit, it is possible to set the low tem-perature circuit setpoint, Setpoint_T_CH_Low = Par. 3, pre-set to 40°C and can be set between 10°C and T_CH_low_li-mit=Par. 23, which in turn is preset to 50°C. The setpoint used will be the one set with parameter 3.

27

The burner is on when:Manifold temperature =Setpoint + shut-off hysteresis .Shut-off hysteresis can be set (CH_Low_Hyst_off=Par. 27, preset to 3, can be set between 0 and 20°C).

With the low temperature circuit attenuation parameter, Par. 25≠0, the low temperature thermostat contact is ignored and a heat demand is present for the low temperature cir-cuit when:Manifold temperature =Setpoint + shut-off hysteresis .The setpoint in this case coincides with the value set for parameter 3 (Setpoint_t_ch_low) if the low temperature thermostat contact is closed, whereas it is calculated as the value set for parameter 3 less the attenuation (Setpoin-t_t_ch_low-Attenuation_low) if the contact is open.

OPERATION WITH CLIMATIC CONTROL, PAR. 22=1If the low temperature circuit attenuation is equal to 0 , At-tenuation_low=Par. 25=0, its behaviour is the same as the previous paragraph, with the exception that the setpoint is calculated based on the outdoor temperature.

If the outdoor temperature = Tout_min=Par. 37, preset to 0°C, then setpoint =setpoint_T_Ch_low.If the outdoor temperature = Tout_max=Par. 38, preset to 18°C, then setpoint T_ch_high_ foot=Par. 24, preset to 50°C.The setpoint is calculated linearly between the 2 outdoor temperature values.

Preset to 0.

3 T_out_correct Outdoor temperature correction (parameter 39)Normally, the displayed value is the value read by the mi-crocontroller plus or minus a correction value (T_visualizza-ta = T read by the sensor +/- correction).The read value of the outdoor temperature can be cor-rected by varying the value of parameter 39, (the permitted limit for the correction is +/- 30 °C). In this phase, it is sug-gested to use a reference thermometer.

Preset to 0.

4 Summer Mode Summer function (parameter 38)The Summer Mode function is used to deactivate requests received by the High Temperature and Low Temperature circuits and from the zones when the outside temperature, T outside, is equal to or above the value set in parameter 38.The Parameter 38 can be set with values between 0 and 30 [°C].

Preset to 0 (summer function disabled).

5 T4_frost_protection Antifreeze protection (parameter 35)The electronic control unit has active antifreeze protection also in stand-by mode. The antifreeze protection has two levels, the first that activates the pump and the second that activates the pump and the burner.

If the manifold temperature ≤ 5°C, the high temperature circuit pump and the system pump (third pump) are activeor, with CH_type=1 and outdoor sensor connected,if the outdoor temperature ≤ 3°C (par. 35) the high tempe-rature pump and the system pump (third pump) are active

If after 10’ the manifold temperature ≤ 5°Ca burner is on at maximum until the manifold temperature ≥ 20°C.

If after 10’ the manifold temperature ≥ 5°C but, with CH_type=1 (Par. 14 or 22) and outdoor sensor connected, the outdoor temperature ≤ 3°C (par. 35) the pump continues to operate until the outdoor temperature ≥ 3°C. Parameter 35 can be set between -30°C and 15°C.

Preset to 3.

6 Power_control_mode Cascading management (parameter 33)To manage the power delivered by the system, two ca-scading strategies are possible. In both cases, the Master control unit can only add a new burner when another is on.If the Master control unit must increase the number of igni-ted burners, first check that the next burner can be ignited: no errors present and modular system temperature below the maximum. Otherwise, check another burner. If no bur-ner is ready for ignition, the master will decrease the num-ber of burners to ignite.

MODE: MINIMUM QUANTITY OF BURNERS IGNITED (PAR. 33=0)

28

System power modulation is controlled by a PID regulator, which controls the manifold temperature and the setpoint is that of the active circuit (high or low temperature circuit setpoint or DHW setpoint). The PID has a direct influence on the last 2 burners ignited, whereas the previous ones operate at maximum power.

If the manifold temperature < Setpoint – 5°C the next bur-ner is ignited and both are managed by the PID regulator.The Master control unit waits for 30s and thenif the manifold temperature < Setpoint - 5°C, another burner is ignited.The first burner operates at maximum power, whereas the other two are managed by the PID regulator.

If the manifold temperature > Setpoint + 2°C the last bur-ner ignited is shut off, the remaining last two burners are managed by the PID regulator and the others operate at maximum power. The Master control unit waits 30s before making another decision.

MODE: MAXIMUM QUANTITY OF BURNERS IGNITED (PAR.33=1)All burners are controlled by the same PID regulator, which controls the manifold temperature and the setpoint is that of the active circuit (high or low temperature circuit setpoint or DHW setpoint).

If the manifold temperature < Setpoint – 5°C the next bur-ner is ignited.The Master control unit waits for 30s and thenif the manifold temperature < Setpoint - 5°C, another burner is ignited.

If the manifold temperature > Setpoint + 2°C the last burner ignited is shut off. The Master control unit waits 30s before making another decision.

ADDITIONAL CASCADING MANAGEMENT FUNCTIONSSequential rotation of burner ignitionWhen supplying power to the Master control unit, the bur-ner with address 1 is the first in the sequence. After 24h, the first burner will be the one with address 2, whereas the one with address 1 will become the last in the sequence.

Ignition/shut off limitationIn both cascading strategies, after every ignition or shut off, there is a minimum time during which the Master cannot ignite or shut off burners.

Quick start-up and shut offIn both modes, there is a quick start-up and shut off fun-ction.If the manifold temperature < Setpoint - 70°Cthe burners are ignited at time intervals equal to 2sIf the manifold temperature > Setpoint + 4°Cthe burners are shut off at time intervals equal to 2s.

Low loadThe low load function prevents burner ignition and shut off in the case of a low heat demand. The conditions for low load operation activation is controlled in every Slave card that sends the function activation request to the Master.During normal operation, the setpoint of the active circuit (high or low temperature circuit setpoint or DHW setpoint) is sent to the Slave cards and is controlled by the tempera-ture of the heating element by every Slave card:if the modular system temperature > Setpoint – 8°C orif the modular system temperature > 85°C - 8°Cconsent for starting the burner is not given.If the Slave board acquires a modular system temperature greater than 85°C for 3 times with the burner ignited, the heating element is turned off and the ignition procedure is started again.

Emergency functionIn the case of a Master card fault, there are two methods for manually controlling the Slave cards:

- With eBUS and with the manifold sensor Disconnect the power supply from the system, di-

sconnect the BUS. Set the address 000000 on all slave cards (J10 and J17 OFF). Connect a power supply between 21 and 28 Vac to the BUS.

If the manifold temperature < Temp.Emergency (Par.40; preset 70°C; can be set between 10 and 80°C) all the burners will operate at maximum power.

If the manifold temperature > Temp.Emergency + 5°C all burners are off.

- With PC Disconnect the system power supply, disconnect

the BUS and connect the PC interface. The burner power can be sent to the Slave card directly with the PC.

b In the case of error, contact Technical Assistance Centre.

Heat demand management for the high temperature circuit with analogue input (Par. 14=2 or 3)The room thermostat for the high temperature circuit is ignored in the case of heat demand and the input signal is used for calculating the system setpoint temperature or power.The analogue input (see terminals 13-14 on the wiring dia-gram on page 35) is only for the Master card and can also be used for the low temperature circuit (Par.22). The analo-gue input cannot be used for both circuits.

ANALOGUE POWER INPUT, Par. 14=2 (Par. 22=2 for low temperature circuits)The following rules apply to high temperature (low tempe-rature) circuit demand:0-2Vdc: no demand by the high temperature (low tempe-

rature) circuit

2-9Vdc: the heat demand is converted into a power de-mand for each Slave. A 2V input corresponds to mi-nimum power, 9V to maximum power (Par.15). The power is calculated linearly between 2V and 9V. Hy-steresis for the end of demand is 0.2V and therefore demand is present above 2V and stops below 1.8V.

29

Voltage (Volt)0 1 2 3 4 5 6 7 8 9 10

Pow

er (k

W)

50

100

150

200

250

Fig. 31

The burner ignited when: - Delivery temp. ≤ Setpoint_ch_high (Par.1) – Ch_high_

hist_on (Par.19) - (Delivery temp. ≤ Setpoint_ch_low (Par.3) – Ch_low_

hist_on (Par.26))The burner shuts off when:

- Delivery temp. > Setpoint_ch_high (Par.1) + Ch_high_hist_off (Par.20)

- (Delivery temp. > Setpoint_ch_low (Par.3) + Ch_low_hist_off (Par.27))

ANALOGUE TEMPERATURE INPUT, Par. 14=3 (Par. 22=3 for low temperature circuits)The following rules apply to high temperature (low tempe-rature) circuit demand:0-2Vdc: no demand by the high temperature (low tempe-

rature) circuit

2-9Vdc: the heat demand is converted into a power de-mand for each Slave, using the algorithm PID_CH_high (PID_CH_low). 2V corresponds to a setpoint equal to T_Ch_high_foot, Par. 18 (T_Ch_low_foot, Par. 24), 9V to a setpoint equal to SetPoint_Ch_high, Par.1 (SetPoint_Ch_low, Par.3). The setpoint is cal-culated linearly between 2V and 9V. Hysteresis for the end of demand is 0.2V and therefore demand is present above 2V and stops below 1.8V.

Setp

oint

102030405060708090

Voltage (Volt)0 1 2 3 4 5 6 7 8 9 10

Fig. 32

The burner ignited when: - Delivery temp. ≤ Setpoint_ch_high (Par.1) – Ch_high_

hist_on (Par.19) - (Delivery temp. ≤ Setpoint_ch_low (Par.3) – Ch_low_

hist_on (Par.26))

The burner shuts off when: - Delivery temp. > Setpoint_ch_high (Par.1) + Ch_

high_hist_off (Par.20) - (Delivery temp. > Setpoint_ch_low (Par.3) + Ch_low_

hist_off (Par.27))

MIX VALVE MANAGEMENTThe mix valve is controlled by the parameters:

- Mix_valve_step_open_time: Par.28 preset to 5s - Mix_valve_step_close_time: Par.29 preset to 7s - Mix_valve_interval_time: Par.30 preset to 5s - Mix_valve_p_hyst: Par.31 preset to 2°C - Mix_valve_still_hyst: Par.32 preset to 2°C

Before opening or closing, the valve waits the period of time set in Par.30.Opens if:T_mandata_bassa < Setpoint_low – Par32Closes if:T_mandata_bassa > Setpoint_low + Par32

Within the interval, the valve remains in its current position.If:T_mandata_bassa < Setpoint_low – Par31opens for a period of time equal to half the value set in Par. 28If:T_mandata_bassa > Setpoint_low + Par31closes for a period of time equal to half the value set in Par. 29.

Time (s)0 2015105

Man

ifold

tem

pera

ture

-5

5

15

25

35

45

55

Fig. 33

30

Mix delivery temperature (°C)20 30 40 50 60

Valv

e cl

osin

g-op

enin

g (s

)

-4

-3

-2

-1

0

1

3

25 35 45 55

2

Open

Clos

e

default Par. 31 = 10Fig. 34

Safety functions of the Slave cardsIf the delivery temperature > 90°C for 5s, the slave card is blocked (no. 46).If the return temperature > 80°C for 5s, the slave card is blocked (no. 47).If the flue gas temperature > 80°C for 5s, the slave card is blocked (no. 48) and the fan operates for 10 minutes at maximum.

The Slave card is able to protect the primary exchanger from the hazards of low water circulation both using a flow switch as well as checking the difference between the deli-very and return temperatures.

Checking ∆T uses the parameter ∆T_max (preset to 35°C) and limits the burner power as follows:

- if ∆T_max -5°C > ∆T > ∆T_max –10°C = burner mo-dulated

- if ∆T_max > ∆T > ∆T_max –5°C = burner at minimum - if ∆_T > ∆_T_max = burner off.

Furthermore, the presence of a sensor stops the exchanger if the pressure inside the combustion unit goes below 0.5 bar.

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10 LIST OF PARAMETERSThe list of parameters for Power Plus Box P INT-EXT is given here below. The user may only alter the first three parameters, whilst the B Technical Assistance Centre must be called in for the others.

User parameters

N° Parameter name Factory settingLower limit

Upper limit Description

1 Temp. CH1 70°C 10°C Par.17High temperature system setpoint.If Par 14 = 0 is the high temp. system setpointIf Par 14 = 1 is the max temp. of the high system

2 Hot water temp. 50°C 10°C Par.08 Hot water system setpoint

3 Temp CH2 40°C 10°C Par.23Low temperature system setpoint.If Par 22 = 0 is the low temp. system setpoint.If Par 22 = 1 is the max. temp of the low system

Installer parameters – altered by B Technical Assistance Centre only

N° Parameter name Factory settingLower limit

Upper limit Description

6 Hot water mode 0 0 6

Hot water system configuration:0 = hot water off1 = rapid exchanger with probe (instantaneous hot water)2 = water tank with probe (hot water produced with accumulation)5 = rapid exchanger with flowmeter6 = water tank with thermostat

7 h.w. max. poten. 230 1 255 Setpoint of power supplied in hot water mode8 h.w. max T. 60°C 10°C 80°C Max. value hot water setpoint

9 h.w. Priority 0 0 2

Hot water system priority.0-1 = Hot water functioning with heating until reaching the heating setpoint. Heating goes off after reaching the setpoint and hot water continues to work2 = Hot water priority

10 T plus water tank 30°C 0°C 50°CEstablishes flow temperature to produce hot water. E.g. hot water setpoint 50°C+30°C. Primary system will be at 80°C.

11 h.w. on diff. 1°C 0°C 20°CBurner goes out after said differential exceeds hot water setpoint.E.g. 50°C + 1°C = 51°C

12 h.w. off diff. 5°C 0°C 20°CBurner ignites after said differential sinks below hot water setpointE.g. 50°C–5°C= 45°C

13 Max h.w. Burner Max (60) 0 60 Max. number of burners functioning in hot water mode

14 CH1 adjustment 1 0 3

High temp. heating system configuration0 = Temperature at fixed point.1 = Weather with probe outside2 = 0–10V: power (Acts on power)3 = 0–10V: temperature (Acts on Temp.)

15 Max. fan speed 230 1 255 Heating power setpoint

16 Heating priority 0 0 2

0 = No functional priority1 = High temp. system priorityThe burner always works on high heating if the H.T. contact is not open2 = Low temp. system priority. The burner always wor-ks on low heating, if the H.T. contact is not open.

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11 ERROR LISTA and E type errors possibly encountered with Power Plus Box P INT-EXT are given in the tables below.In this sense it should be specified that an E-type error (volatile error) is a fault which automatically disappears as soon as the fault is resolved; whilst A type (non-volatile error) is a fault that will only disappear after resetting manually when the problem has been resolved.

11 .1 Master board errorsN° No. on the PC Cause Troubleshooting

A16 10 Internal error Replace the Master cardA18 12 Internal error Replace the Master cardA20 14 Internal error Replace the Master card

N° No. on the PC Cause Troubleshooting

E02 51 NTC1 open (NTC1: delivery sensor) Primary delivery sensor not connected or interrupted.

E04 53 NTC3 open (NTC3: boiler sensor) DHW sensor not connected or interrupted.

E18 67 NTC1 short circuiting (NTC1: delivery sensor) Primary circuit delivery sensor short circuit.

E20 69 NTC3 short circuiting (NTC3: boiler sensor) DHW sensor short circuiting.

E23 28 Internal error Replace the Master cardE24 29 Internal error Replace the Master cardE25 0/30 Internal error Replace the Master cardE26 31 Internal error Replace the Master card

E32 33 Slaves not present

Check that the bipolar switches of the individual units are “ON”.Check the addresses on the slave.Check the slave BUS connection.Replace the Master.Replace the slave.

E34 42 Internal 50HZ error The main frequency is not 50Hz

11 .2 Slave board errorsN° No. on the PC Cause Troubleshooting

A01 1 5 ignition attempts without success

Check that the gas tap is open.Check for the presence of electric discharge between the two ignition electrodes.Check the ignition cable.Do not open the gas valve.Replace the electronic card (Slave).Make sure the float in the siphon is not stuck.Make sure the module is not full of condensation.Check that the VIC (gas shut-off valve) was not trip-ped.

A02 2Multiple unsuccessful attemp-

ts due to flame ionisation problems

Clean the electrodes.Replace the igniter plug.Replace the ignition cable.

A04 4Water side limit thermostat (> 90°C) tripping, version

SCHEDA43Poor circulation in the primary circuit.Limit thermostat defective.

A05 5

Gas valve coil interrupted.False gas valve connector

contact.Defective gas valve connec-

tor.Water side limit thermostat

tripped(> 90°C) while the burner was

on.

Replace the gas valveCheck the gas valve connectorReplace the gas valve connectorPoor circulation in the primary circuit.Limit thermostat defective.

33

N° No. on the PC Cause TroubleshootingA06 6 Internal error Replace the Slave cardA07 7 Internal error Replace the Slave cardA08 8 Internal error Replace the Slave cardA09 9 50HZ error The main frequency is not 50HzA10 10 Internal error Replace the Slave cardA11 11 Internal software error Press the rest buttonA12 12 Internal error Replace the Slave card

A16 16 The limit thermostat contact is open with the burner offConnector disconnected or defective.Limit thermostat defective.

A17 17 Delivery sensor error due toexceeding the limit temp.Check the correct flow rate in the water circuit of the individual unit. 2 m3/h per unit

A18 18 Return sensor error due toe-xceeding the limit temp.Check the correct flow rate in the water circuit of the individual unit. 2 m3/h per unit

A19 19The flue gas sensor tripped

due toovertemperature > 80°C ( in this case, the fan

turns at max. speed)

Heat exchange insufficient on the flue gas side inside the exchanger.Clean the flue gas side exchanger.