Unigas HR75A Series, HR75A MG Series, HR75A LG Series Manual Of Installation - Use - Maintenance

M039315CA Rel. 0.3 07/2015

BURNERS - BRUCIATORI - BRULERS - BRENNER - QUEMADORES -

ГОРЕЛКИ

LMV2x

Microprocessor-controlled

Gas - light oil burners

MANUAL OF INSTALLATION - USE - MAINTENANCE

HR75A

DANGERS, WARNINGS AND NOTES OF CAUTION

THIS MANUAL IS SUPPLIED AS AN INTEGRAL AND ESSENTIAL PART OF THE PRODUCT AND MUST BE DELIVERED TO THE USER.

INFORMATION INCLUDED IN THIS SECTION ARE DEDICATED BOTH TO THE USER AND TO PERSONNEL FOLLOWING PRODUCT INSTALLATION AND MAINTENANCE.

THE USER WILL FIND FURTHER INFORMATION ABOUT OPERATING AND USE RESTRICTIONS, IN THE SECOND SECTION OF THIS MANUAL. WE HIGHLY RECOMMEND TO READ IT.

CAREFULLY KEEP THIS MANUAL FOR FUTURE REFERENCE.

1) GENERAL INTRODUCTION

z The equipment must be installed in compliance with the regulations

in force, following the manufacturer’s instructions, by qualified personnel.

z Qualified personnel means those having technical knowledge in the

field of components for civil or industrial heating systems, sanitary hot water generation and particularly service centres authorised by the manufacturer.

z Improper installation may cause injury to people and animals, or

damage to property, for which the manufacturer cannot be held liable.

z Remove all packaging material and inspect the equipment for inte-

grity. In case of any doubt, do not use the unit - contact the supplier. The packaging materials (wooden crate, nails, fastening devices, plastic

bags, foamed polystyrene, etc), should not be left within the reach of children, as they may prove harmful. z Before any cleaning or servicing operation, disconnect the unit from

the mains by turning the master switch OFF, and/or through the cut-

out devices that are provided.

z Make sure that inlet or exhaust grilles are unobstructed. z In case of breakdown and/or defective unit operation, disconnect the

unit. Make no attempt to repair the unit or take any direct action. Contact qualified personnel only. Units shall be repaired exclusively by a servicing centre, duly authorised

by the manufacturer, with original spare parts. Failure to comply with the above instructions is likely to impair the unit’s

safety. To ensure equipment efficiency and proper operation, it is essential that

maintenance operations are performed by qualified personnel at regular intervals, following the manufacturer’s instructions. z When a decision is made to discontinue the use of the equipment,

those parts likely to constitute sources of danger shall be made har-

mless. z In case the equipment is to be sold or transferred to another user, or

in case the original user should move and leave the unit behind,

make sure that these instructions accompany the equipment at all

times so that they can be consulted by the new owner and/or the

installer. z For all the units that have been modified or have options fitted then

original accessory equipment only shall be used. z This unit shall be employed exclusively for the use for which it is

meant. Any other use shall be considered as improper and, there-

fore, dangerous. The manufacturer shall not be held liable, by agreement or otherwise, for

damages resulting from improper installation, use and failure to comply with the instructions supplied by the manufacturer.The occurrence of any of the following circustances may cause explosions, polluting unburnt gases (example: carbon monoxide CO), burns, serious harm to people, animals and things:

- Failure to comply with one of the WARNINGS in this chapter

- Incorrect handling, installation, adjustment or maintenance of the burner

- Incorrect use of the burner or incorrect use of its parts or optional supply

2) SPECIAL INSTRUCTIONS FOR BURNERS

z The burner should be installed in a suitable room, with ventilation

openings complying with the requirements of the regulations in force,

and sufficient for good combustion. z Only burners designed according to the regulations in force should

be used. z This burner should be employed exclusively for the use for which it

was designed.

z Before connecting the burner, make sure that the unit rating is the

same as delivery mains (electricity, gas oil, or other fuel).

z Observe caution with hot burner components. These are, usually,

near to the flame and the fuel pre-heating system, they become hot during the unit operation and will remain hot for some time after the

burner has stopped. When the decision is made to discontinue the use of the burner, the user shall have qualified personnel carry out the following operations: a Remove the power supply by disconnecting the power cord from the

mains. b) Disconnect the fuel supply by means of the hand-operated shut-off

valve and remove the control handwheels from their spindles.

Special warnings

z Make sure that the burner has, on installation, been firmly secured to

the appliance, so that the flame is generated inside the appliance

firebox. z Before the burner is started and, thereafter, at least once a year,

have qualified personnel perform the following operations: a set the burner fuel flow rate depending on the heat input of the

appliance; b set the flow rate of the combustion-supporting air to obtain a combu-

stion efficiency level at least equal to the lower level required by the

regulations in force; c check the unit operation for proper combustion, to avoid any harmful

or polluting unburnt gases in excess of the limits permitted by the

regulations in force; d make sure that control and safety devices are operating properly; e make sure that exhaust ducts intended to discharge the products of

combustion are operating properly; f on completion of setting and adjustment operations, make sure that

all mechanical locking devices of controls have been duly tightened; g make sure that a copy of the burner use and maintenance instruc-

tions is available in the boiler room. z In case of a burner shut-down, reser the control box by means of the

RESET pushbutton. If a second shut-down takes place, call the

Technical Service, without trying to RESET further. z The unit shall be operated and serviced by qualified personnel only,

in compliance with the regulations in force.

3) GENERAL INSTRUCTIONS DEPENDING ON FUEL USED

3a) ELECTRICAL CONNECTION

z For safety reasons the unit must be efficiently earthed and installed

as required by current safety regulations. z It is vital that all saftey requirements are met. In case of any doubt,

ask for an accurate inspection of electrics by qualified personnel,

since the manufacturer cannot be held liable for damages that may

be caused by failure to correctly earth the equipment. z Qualified personnel must inspect the system to make sure that it is

adequate to take the maximum power used by the equipment shown

on the equipment rating plate. In particular, make sure that the

system cable cross section is adequate for the power absorbed by

the unit. z No adaptors, multiple outlet sockets and/or extension cables are per-

mitted to connect the unit to the electric mains. z An omnipolar switch shall be provided for connection to mains, as

required by the current safety regulations. z The use of any power-operated component implies observance of a

few basic rules, for example:

- do not touch the unit with wet or damp parts of the body and/or with

bare feet;

- do not pull electric cables;

- do not leave the equipment exposed to weather (rain, sun, etc.)

unless expressly required to do so;

- do not allow children or inexperienced persons to use equipment;

z The unit input cable shall not be replaced by the user. In case of damage to the cable, switch off the unit and contact qualified personnel to replace. When the unit is out of use for some time the electric switch supplying all the power-driven components in the system (i.e. pumps, burner, etc.)

should be switched off.

3b) FIRING WITH GAS, LIGHT OIL OR OTHER FUELS

GENERAL

z The burner shall be installed by qualified personnel and in com-

pliance with regulations and provisions in force; wrong installation can cause injuries to people and animals, or damage to property, for which the manufacturer cannot be held liable.

z Before installation, it is recommended that all the fuel supply system

pipes be carefully cleaned inside, to remove foreign matter that might impair the burner operation.

z Before the burner is commissioned, qualified personnel should

inspect the following: a the fuel supply system, for proper sealing; b the fuel flow rate, to make sure that it has been set based on the

firing rate required of the burner; c the burner firing system, to make sure that it is supplied for the desi-

gned fuel type; d the fuel supply pressure, to make sure that it is included in the range

shown on the rating plate; e the fuel supply system, to make sure that the system dimensions are

adequate to the burner firing rate, and that the system is equipped

with all the safety and control devices required by the regulations in

force. z When the burner is to remain idle for some time, the fuel supply tap

or taps should be closed.

DIRECTIVES AND STANDARDS

Gas burners

European directives

-2009/142/EC (Gas Directive)

-2006/95/CEC (Low Tension Directive)

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Harmonized standards

-UNI EN 676 (Automatic forced draught burners for gaseous fuels)

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-CEI EN 60335-1 (Specification for safety of household and similar electrical appliances);

-EN 50165 (Electrical Equipment of non-electric appliances for household and similar purposes).

-EN 60335-2-102 (Household and similar electrical appliances. Safety. Particular requirements for gas, oil and solid-fuel burning appliances having electrical connections).

Light oil burners

European directives

-2006/95/EC (Low Tension Directive)

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Harmonized standards

-UNI EN 267(Automatic forced draught burners for liquid fuels)

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-CEI EN 60335-1(Specification for safety of household and similar electrical appliances)

-EN 50165 (Electrical Equipment of non-electric appliances for household and similar purposes)

National Standard

-UNI 7824 (Atomizing burners of the monobloc type. Characteristics and test methods)

SPECIAL INSTRUCTIONS FOR USING GAS

Have qualified personnel inspect the installation to ensure that: a the gas delivery line and train are in compliance with the regulations

and provisions in force; b all gas connections are tight; c the boiler room ventilation openings are such that they ensure the air

supply flow required by the current regulations, and in any case are

sufficient for proper combustion.

z Do not use gas pipes to earth electrical equipment. z Never leave the burner connected when not in use. Always shut the

gas valve off. z In case of prolonged absence of the user, the main gas delivery

valve to the burner should be shut off.

Precautions if you can smell gas

a do not operate electric switches, the telephone, or any other item

likely to generate sparks; b immediately open doors and windows to create an air flow to purge

the room; c close the gas valves; d contact qualified personnel. z Do not obstruct the ventilation openings of the room where gas

appliances are installed, to avoid dangerous conditions such as the

development of toxic or explosive mixtures.

Heavy oil burners

European Directives

-2006/95/EC (Low Tension Directive)

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Harmonized standards

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-UNI EN 267(Automatic forced draught burners for liquid fuels)

-CEI EN 60335-1 (Specification for safety of household and similar electrical appliances);

-EN 50165 (Electrical Equipment of non-electric appliances for household and similar purposes).

Norme nazionali / National Standard

-UNI 7824 (Atomizing burners of the monobloc type. Characteristics and test methods.

Gas - Light oil burners

European Directives

-2009/142/EC (Gas Directive)

-2006/95/EC (Low Tension Directive)

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Norme armonizzate / harmonized standards

-UNI EN 676 (Automatic forced draught burners for gaseous fuels)

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-UNI EN 267(Automatic forced draught burners for liquid fuels)

-CEI EN 60335-1(Specification for safety of household and similar electrical appliances);

-EN 50165 (Electrical Equipment of non-electric appliances for household and similar purposes).

Norme nazionali / National Standard

-UNI 7824 (Atomizing burners of the monobloc type. Characteristics and test methods.

European directives:

-2009/142/EC (Gas Directive)

Gas - Heavy oil burners

-2006/95/EC (Low Tension Directive)

Type -Model -Year -S.Number -Output -Oil Flow -Fuel -Category -Gas Pressure -Viscosity -El.Supply -El.Consump. -Fan Motor -Protection -Drwaing n° -P.I.N. --

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Harmonized standards

-UNI EN 676 (Automatic forced draught burners for gaseous fuels)

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-CEI EN 60335-1 (Specification for safety of household and similar electrical appliances)

-EN 50165 (Electrical equipment of non-electric appliances for household and similar purposes. Safety requirements)

National Standard

- UNI 7824 (Atomizing burners of the monobloc type. Characteristics and test methods.

Industrial burners

European directives

-2009/142/EC (Gas Directive)

-2006/95/EC (Low Tension Directive)

-2004/108/EC (Electromagnetic compatibility Directive)

-2006/42/EC (Machinery Directive)

Harmonized standards

-EN 55014-1 (Electromagnetic compatibility- Requirements for house hold appliances, electric tools and similar apparatus)

-EN 746-2 (Industrial thermoprocessing equipment - Part 2: Safety requirements for combustion and fuel handling systems)

-EN 50165 (Electrical equipment of non-electric appliances for household and similar purposes. Safety requirements)

Burner data plate

For the following information, please refer to the data plate:

z burner type and burner model: must be

reported in any communication with the supplier

z burner ID (serial number): must be repor-

ted in any communication with the supplier

z date of production (year and month) z information about fuel type and network

pressure

SYMBOLS USED

Failure to observe the warning may

WARNING!

DANGER!

WARNING!

result in irreparable damage to the unit or damage to the environment

Failure to observe the warning may result in serious injuries or death.

Failure to observe the warning may result in electric shock with lethal consequences

1.0 BURNERS FEATURES

PART I: SPECIFICATIONS

Note: the figure is indicative only.

1 Control panel with startup switch 2 Gas valves group 3 Electrical panel 4 Flange 5 Blast tube + Combustion head 6 Silencer 7 Air pressure switch 8 Oil pressure switch 9Oil Pump

PART I: SPECIFICATIONS

Fig. 1

Gas operation: the gas coming from the supply line, passes through the valves group provided with filter and governor. This one forces the pressure in the utilisation limits. The actuators move proportionally the air damper and the gas butterfly valve, in order to achieve the optimisation of the gas flue values, as to get an efficient combustion.

Light oil operation:the fuel coming from the supply line, is pushed by the pump to the nozzle and then into the combustion chamber, where the mixture between fuel and air takes place and consequently the flame. In the burners, the mixture bertween fuel and air, to perform clean and efficient combustion, is activated by atomisation of oil into very small particles. This process is achieved making pressurised oil passing through the nozzle. The pump main function is to transfer oil from the tank to the nozzle in the desired quantity and pressure. To adjust this pressure, pumps are provided with a pressure regulator (except for some models for which a separate regulating valve is provided). Other pumps are provided with two pressure regulators: one for the high and one for low pressure (in double-stage systems with one nozzle).

The adjustable combustion head can improve the burner performance. The combustion head determines the energetic quality and the geometry of the flame. Fuel and comburent are routed into separated ways as far as the zone of flame generation (combustion chamber). The control panel, placed on the burner front side, shows each operating stage.

PART I: SPECIFICATIONS

1.1 Burner model identification

Burners are identified by burner type and model. Burner model identification is described as follows.

Type HR75A Model MG. MD. S. *. A. 1. 40. EC.

(1) (2) (3) (4) (5) (6) (7) (8) (9)

1 BURNER TYPE HR75A 2 FUEL M - Natural gas

L - LPG G - Light oil

3 OPERATION (Available versions) PR - Progressive

MD - Fully modulating 4 BLAST TUBE S - Standard 5 DESTINATION COUNTRY

6 BURNER VERSION A - Standard

7 EQUIPMENT 1 = 2 gas valves + gas proving system

8 GAS CONNECTION 40 = Rp1

9 MICRO-PROCESSOR CONTROL EC = micro-processor control, without inverter

* - see data plate

Y - SpecialeSpecial

8 = 2 gas valves + gas proving system + maximum gas pressure switch

50 = Rp2

1/2

65 = DN65 80 = DN80

ED = micro-processor control, with inverter

1.2 Technical Specifications

BURNER TYPE HR75A MG.. HR75A LG..

Output min - max kW

Fuel Natural gas - Light oil

CATEGORY

2E( R ) B

2ELL

2Er

1.4 Fuel

COUNTRY

AT ES GR SE FI IE HU IS NO CZ DK GB IT PT CY EE LV SI MT SK BG LT RO TR CH

LUPL-----------------------

BE------------------------

NL------------------------

DE------------------------

FR------------------------

WARNING! The burner must be used only with the fuel specified in the bu rner data plate .

1.5 Overall dimensions (mm)

AE U

O min

O max

Burner flange

Boiler recommended drilling template

PART I: SPECIFICATIONS

DN = gas valves size

DN A AA AB AC AD AE B BB C CC D E F G H J K L M Omin Omax P Q R S U W Y Z

HR75A 1.50 1253 69 550 435 28 305 503 374 750 352 979 618 361 254 270 235 300 453 M10 216 250 233 465 127 338 525 608 210 155

1.65 1253 69 550 435 28 305 503 374 750 352 1051 690 361 254 270 282 300 453 M10 216 250 233 535 127 408 565 608 210 155

1.80 1253 69 550 435 28 305 503 374 750 352 1051 690 361 254 270 284 300 453 M10 216 250 233 555 127 428 565 608 210 155

Fig. 2 - 3I2MG-21 v0 Hydraulic diagram

PSPSH PSL

VGD

4042

45 43

6.1

16.1

MB-DLE

PSH

PSL

25 23

oil inlet

oil outlet

gas inlet

combustion air

BY BURNER CONSTRUCTOR

BY OTHERS

According to the gas train size and the burner type, MB-DLE safety valves are supplied. In this case, the item 42 is integrated in the valves. See the following drawing.

Note: The following POS are optional: 19, 20, 40, 41, 46

LEGEND

POS OIL TRAIN

1 Filter 2 Flexible hose 3 Pump and pressure governor 4 Electrical motor 6 Solenoid valve

6.1 Solenoid valve 10 Oil distributor 12 Pressure gauge 13 Pressure governor 15 Pressure switch 16 One-way valve

16.1 One-way valve 18 Flexible hose 19 Manual valve 20 Pressure gauge

MAIN GAS TRAIN

23 Pressure switch - PGMIN 24 Safety valve with built in gas governor 25 Proving system pressure switch - PGCP 26 Pressure switch - PGMAX 40 Manual valve 41 Bellows unit 42 Filter 43 Pressure switch - PGMIN 44 Safety valve with built in gas governor 45 Proving system pressure switch - PGCP 46 Pressure switch - PGMAX 47 Butterfly valve

51 Actuator

COMBUSTION AIR TRAIN

50 Air damper

51 Actuator

52 Pressure switch - PA 53 Draught fan with electromotor 54 Burner

PART I: SPECIFICATIONS

Campo di lavoro bruciatori

Tipo P60 Mod. M-x x.x.IT.A.0.50 - M-.x x.x.IT.A.0.65

-1

100 200 300 400 500 600 700 800 900

Pote nza kW

Contropressione in camera di

combustione mbar

backpressure in

combustion chamber (mbar)

Power kW

100 200 300 400 500 600 700 800 900

Potenza / Output (k W)

Minima pressione gas in

rete / Minimum inlet gas

pressure (mbar)

Rp 2" (50)

DN65

Power kW

minimum gas pressure in

the network mbar

1.6 How to read the burner “Performance curve”

To check if the burner is suitable for the boiler to which it must be installled, the following parameters are needed:

z furnace input, in kW or kcal/h (kW = kcal/h / 860); z backpressure (data are available on the boiler ID plate or in the

user’s manual). Example: Furnace input: 600kW Backpressure: 4mbar In the “Performance curve” diagram, draw a vertical line matching the

furnace input value and an horizontal line matching the backpressure value. The burner is suitable if the intersection point A is inside the performance curve. Data are referred to standard conditions: atmospheric pressure at

1013mbar, ambient temperature at 15°C.

1.7 Checking the proper gas train size

To check the proper gas train size, it is necessary to the available gas pressure value upstream the burner’s gas valve. Then subtract the backpressure. The result is called pgas. Draw a vertical line matching the furnace input value (600kW, in the example), quoted on the x-axis, as far as intercepitng the network pressure curve, according to the installed gas train (DN65, in the example). From the interception point, draw an horizontal line as far as matching, on the y-axis, the value of pressure necessary to get the requested furnace input. This value must be lower or equal to the pgas value, calculated before.

1.8 Performance Curves

HR75A

PRESSURE IN

COMBUSTION CHAMBER (mbar)

To get the input in kcal/h, multiply value in kW by 860. Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15°C NOTE: The performance curve is a diagram that represents the burner performance in the type approval phase or in the laboratory

tests, but does not represent the regulation range of the machine. On this diagram the maximum output point is usually reached by adjsuting the combustion head to its “MAX” position (see paragraph “Adjusting the combustion head”); the minimum output point is reached setting the combustion head to its “MIN” position. During the first ignition, the combustion head is set in order to find a compromise between the burner output and the generator specifications, that is why the minimum output may be different from the Performance curve minimum.

1.9 Pressure in the Network / gas flow rate curves(natural gas)

HR75A M-..

GAS PRESSURE IN

THE NETWORK mbar

PART I: SPECIFICATIONS

Gas rate Stm

Caution: the gas rate value is quoted on the x-axis, the related network pressure is quoted on the y-axis (pressure value in the combustion chamber is not inclu ded). To know the minimum pressure at the gas train inlet, necessary to get the requested gas rate, add the pressure value in the combustion chamber to the value read on the y-axis.

1.10 Pressure in the Network / gas flow rate curves(LPG)

HR75A L-..

GAS PRESSURE IN

THE NETWORK mbar

Gas rate Stm

PART I: SPECIFICATIONS

1.11 Combustion head gas pressure curves depending on the flow rate

The curves referred to the gas pressure in the combustion head, depending on the gas flow rate, are referred to the burner properly adjusted (percentage of residual O2 in the flues as shown in the “Recommended combustion values” table and CO in the standard limits). During this stage, the combustion head, the gas butterfly valve and the actuator are at the maximum opening. Refer to Fig. 3, showing the correct way to measure the gas pressure, considering the values of pressure in combustion chamber, surveyed by means of the pressure gauge or taken from the boiler’s Technical specifications.

Fig. 3

Note: the figure is indicative only.

Key

1 Generator 2 Pressure outlet on the combustion chamber 3 Gas pressure outlet on the butterfly valve 4 Differential pressure gauge

1.12 Measuring the gas pressure in the combustion head

In order to measure the pressure in the combustion head, insert the pressure gauge probes: one into the combustion chamber’s pressure outlet to get the pressure in the combustion chamber and the other one into the butterfly valve’s pressure outlet of the burner. On the basis of the measured differential pressure, it is possible to get the maximum flow rate: in the pressure - rate curves (showed on

the next paragraph), it is easy to find out the burner’s output in Stm combustion head (quoted on the y axis). The data obtained must be considered when adjusting the gas flow rate.

ATTENTION: THE BURNED GAS RATE MUST BE READ AT THE GAS FLOW METER. WHEN IT IS NOT POSSIBLE, THE USER CAN REFERS TO THE PRESSURE-RATE CURVES AS GENERAL INFORMATION ONLY.

/h (quoted on the x axis) from the pressure measured in the

1.13 Pressure - rate in combustion head curves (natural gas)

Curves are referred to pressure = 0 mbar in the combustion chamber!

HR75A M-..

Gas pressure in

combustion head (mbar)

Stm3/h

PART I: SPECIFICATIONS

1.14 Pressure - rate in combustion head curves (LPG)

Curves are referred to pressure = 0mbar in the combustion chamber!

HR75A L-..

Gas pressure in

combustion head (mbar)

Stm

PART II: INSTALLATION

2.0 MOUNTING AND CONNECTING THE BURNER

2.1 Packing

The burners are despatched in wooden crates whose dimensions are:

1672mm x 1072mm x 1016mm (L x P x H)

Packing cases of this type are affected by humidity and are not suitable for stacking. The following are placed in each packing case:

z burner with gas train; z ceramic fibre plait to be inserted between the burner and the boiler; z envelope containing this manual.

To get rid of the burner’s packing, follow the procedures laid down by current laws on disposal of materials.

2.2 Handling the burner

ATTENTION! The handling operations must be carried out by specialised and trained personnel. If these operations are not carried out correctly, the residual risk for the burner to overturn and fall down still persists .

To move the burner, use means suitable to support its weight (see paragraph “Technical specifications”). The unpacked burner must be lifted and moved only by means of a fork lift truck.

The burner is mounted on a stirrup provided for handling the burner by means of a fork lift truck: the forks must be inserted into the A anb B ways. Remove the stirrup only once the burner is installed to the boiler.

2.3 Fitting the burner to the boiler

To install the burner into the boiler, proceed as follows: 1 make a hole on the closing door of the combustion chamber as described on paragraph “Overall dimensions”) 2 place the burner to the boiler: lift it up and handle it according to the procedure described on paragraph “Handling the burner”; 3 place the 4 stud bolts (5), according to the burner’s drilling plate described on paragraph “Overall dimensions”; 4 fasten the 4 stud bolts; 5 place the ceramic fibre plait on the burner flange; 6 install the burner into the boiler; 7 fix the burner to the stud bolts, by means of the fixing nuts, according to the next picture. 8 After fitting the burner to the boiler, ensure that the gap between the blast tube and the refractory lining is sealed with appropriate

insulating material (ceramic fibre cord or refractory cement).

PART II: INSTALLATION

Keys

1 Burner 2 Fixing nut 3Washer 4 Ceramic fibre plait 5 Stud bolt 7Blast tube

SIDE UP

SIDE

DOWN

The burner is designed to work positioned according to the picture below. For different installations, please contact the Technical Department.

PART II: INSTALLATION

Dist

2.4 Matching the burner to the boiler

The burners described in this manual have been tested with combustion chambers that comply with EN676 regulation and whose dimensions are described in the diagram . In case the burner must be coupled with boilers with a combustion chamber smaller in diameter or shorter than those described in the diagram, please contact the supplier, to verify that a correct matching is possible, with respect of the application involved. To correctly match the burner to the boiler verify the type of the blast tube . Verify the necessary input and the pressure in combustion chamber are included in the burner performance curve; otherwise the choice of the burner must be revised consulting the burner manufacturer. To choose the blast tube lenght follow the instructions of the boiler manufacturer. In absence of these consider the following:

z Cast-iron boilers, three pass flue boilers (with the first pass in the rear part): the blast tube must protrude no more than Dist = 100

mm into the combustion chamber. (please see the picture below)

z Pressurised boilers with flame reversal: in this case the blast tube must penetrate Dm 50 ÷ 100 mm into combustion chamber in

respect to the tube bundle plate.(please see the picture below)

The length of the blast tubes does not always allow this requirement to be met, and thus it may be necessary to use a suitablyspacer to move the burner backwards or to design a blast tube tha suites the utilisation (please, contact the manifacturer).

Key

a) Heat output in kW b) Lenght of the flame tube in meters

c) Flame tube firing intensity in MW/m

d) Combustion chamber diameter (m)

Fig. 4 - Firing intensity, diameter and lenght of the test flame tube as a function of the heat input in kW.

Fig. 4

sized

+ 36 hidden pages

Unigas HR75A Series, HR75A MG Series, HR75A LG Series Manual Of Installation - Use - Maintenance

Specifications and Main Features

Frequently Asked Questions

User Manual