elco ADINOx HT Installation guide

ADI-Nox HT Boiler

With LMS Controls

Models 105 to 950

Operating & Maintenance Manual

MHS Boilers Ltd

3 Juniper West

Fenton Way

Southfields Business Park

Basildon

Essex

SS15 6SJ

Tel: 01268 546700

Fax: 01268 888270

WWW.MHSBOILERS.COM

L349

2 L349

I

N

D

E

X

1. INTRODUCTION _________________________________________________________________________________ 3

2. REGULATIONS _________________________________________________________________________________ 7

3. EEC APPROVALS AND CERTIFICATIONS ___________________________________________________________ 7

4. BOILER GENERAL VIEW: DESCRIPTION OF THE COMPONENTS ________________________________________ 8

5. DIMENSIONS __________________________________________________________________________________ 10

6. TECHNICAL DATA______________________________________________________________________________ 12

6.1 Models ADI HT 105 to ADI HT 400 ________________________________________________________________ 12

6.2 Models ADI HT 475 to ADI HT 950 ________________________________________________________________ 13

7. BOILER HEAT EXCHANGER _____________________________________________________________________ 14

8. POWER MODULATION AND COMBUSTION SYSTEM _________________________________________________ 14

8.1 Assembly of gas connection – air/gas inlet ________________________________________________________ 16

8.2 Air inlet filter _________________________________________________________________________________ 18

8.2.1 Optional air filter for ADI little size ______________________________________________________________ 18

9. BURNER ______________________________________________________________________________________ 19

9.1 Ignition and ionization kit _______________________________________________________________________ 19

10. CONTROL PANEL - SIEMENS ___________________________________________________________________ 20

10.1 Display _____________________________________________________________________________________ 21

10.2 Programming ________________________________________________________________________________ 24

10.3 Available parameters at enduser level ___________________________________________________________ 27

10.4 Boiler lockout code ___________________________________________________________________________ 28

10.5 Function boiler maintenance ___________________________________________________________________ 28

10.6 Data and information visualized on the display ____________________________________________________ 28

11. CONTROL OF SEVERAL BOILERS – CASCADED SYSTEM ___________________________________________ 29

11.1 Boilers sequence included _____________________________________________________________________ 29

11.2 External control signal 0…10 V to regulate start-up and power modulation of each boiler _________________ 34

11.3 Remote Control or telecomputing __________________________________________ Error! Bookmark not defined.

12. ELECTRIC DRAWING __________________________________________________________________________ 36

12.1 Electric drawing ADI HT 105 – 850 (single-phase motor) ____________________________________________ 37

12.2 Electric drawing ADI HT 950 (three-phase motor) __________________________________________________ 37

12.3 Cover of Siemens electronical board ____________________________________________________________ 39

12.4 Cable entry points ____________________________________________________________________________ 39

13. HEATING CIRCUITS ___________________________________________________________________________ 40

13.1 Heating circuits basic parameters _______________________________________________________________ 42

13.2 Professional installator parameters _____________________________________________________________ 42

14. DOMESTIC HOT WATER ________________________________________________________________________ 48

14.1 Basic parameters ____________________________________________________________________________ 49

14.2 Professional installator parameters _____________________________________________________________ 50

15. SAFETIES ____________________________________________________________________________________ 52

16. BOILERS IDENTIFICATION LABEL _______________________________________________________________ 52

17. INSTALLATION _______________________________________________________________________________ 53

17.1 Boilers heat output ___________________________________________________________________________ 53

17.2 Lifting and transporting the boilers by a crane ____________________________________________________ 53

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17.3 Boilers room ________________________________________________________________________________ 53

17.4 GAS SUPPLY ________________________________________________________________________________ 54

17.4.1 Gas pressure higher than 45 mbar _____________________________________________________________ 54

17.5 Chimneys ___________________________________________________________________________________ 55

17.5.1 Chimney sizing _____________________________________________________________________________ 55

17.5.2 Flue draught stabilizer _______________________________________________________________________ 56

17.5.3 Old installation _____________________________________________________________________________ 56

17.5.4 Adjustable flue damper at the boiler flue outlet __________________________________________________ 57

17.6 HYDRAULIC INSTALLATION ___________________________________________________________________ 58

17.6.1 Data to be considered _______________________________________________________________________ 58

17.6.2 Overpressure safety valve ____________________________________________________________________ 58

17.6.3 Hydraulic pressure drop _____________________________________________________________________ 59

17.6.4 Water manifold _____________________________________________________________________________ 60

17.6.5 Water quality of the installation _______________________________________________________________ 61

17.7.6 System drawings ___________________________________________________________________________ 62

17.6.7 Minimum return water temperature to boilers and system drawings _________________________________ 66

18. THE BOILER START-UP ________________________________________________________________________ 67

18.1 Before the start-up ___________________________________________________________________________ 67

18.2 Air and gas pressure switch ___________________________________________________________________ 67

18.3 The boiler control unit and operating cycle _______________________________________________________ 68

18.4 Gas/air adjustments __________________________________________________________________________ 69

18.4.1 Combustion adjustment _____________________________________________________________________ 69

18.4.2 Change of fuel: from Propane gas to Natural gas _________________________________________________ 71

19. MAINTENANCE _______________________________________________________________________________ 71

19.1 Procedure to dismantle the burner ______________________________________________________________ 71

19.2 Position of probes and sensors ________________________________________________________________ 73

19.3 COMBUSTION DATA __________________________________________________________________________ 74

20. BOILER GUARANTEE __________________________________________________________________________ 75

21. APPENDIX I: LIST OF ERROR CODES ____________________________________________________________ 77

Please note that this manual is liable to changes and alterations or withdrawal without prior notice

MHS Boilers Ltd reserve the right to make modifications without notice and any changes made are not

necessarily retrospective to older models.

No company, person or entity external to MHS Boilers can modify this document.

ADI HT boiler - Technical Manual

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1. INTRODUCTION

The global trend, European and international, aims at improving energetic efficiency both in buildings and

generators, in order to reduce pollutant emissions in the atmosphere (directive SAVE, KYOTO agreement)

Carbon dioxide (CO2) is one of the greenhouse gases that remain the longest in the atmosphere. In accordance

with IEO2007, predicted CO2 emissions will be 33.9 billon tons in 2015 and 42.9 in 2030.

This is why the European campaign known as “20-20-20 in 2020” has been created, with the aim, among others, of

cutting carbon dioxide emissions by 20% by 2020.

The main characteristics of the ADI HT boiler are:

- Maximum efficiency in every kind of installations at any working temperatures.

 Renovation of installations with traditional heat radiators

 Domestic Hot Water (D.H.W.S.), in accordance with anti-legionella regulations.

- EEC Approval by CERTIGAZ, with 3 performance stars for its high energetic efficiency (according to the

European directive 92/42/EEC).

- Net efficiencies from 95 to 97% ref. to L.C.V.

- Boiler certified as “High temperature”: flow temperature up to 90ºC, minimum return temperature 60ºC.

- Power outputs from 104 to 905 kW.

- Maximum efficiency per year :

 Boiler power modulation according to the demands of the installation.

 High reduction of stop/start cycles.

 Minimum heat losses due to convection/radiation through the boiler.

 Inconsiderable heat losses through the chimney when the boiler is not operating.

- Gas boilers with modulating burner starting from 30% of power (depending on the installation conditions and

models).

- Burner power modulation by varying the premix air-gas flow by means of a motor fan of variable speed.

- Reduced electric consumptions per year thanks to the motor fan of variable speed for the air-gas inlet.

- Ecological combustion (“PREMIX” burner of innovative design).

NOx: about 10 ppm, CO: about 50 ppm (both referred to 3% O

2

).

- Boiler regulation and control adaptable to all systems available on the market:

 The boiler can operate by means of its own regulation.

 It can be connected to a sequence control unit in an installation with several boilers.

 It can be connected to Building Manage System (B.M.S.).

 It can be connected to telecomputing.

- Reduced dimensions and weight:

Boiler heat exchanger ADI HT 475 (464 kW of output)  Large: 81 cm, Long: 94 cm, Weight: 460 kg.

Easy installation in boiler rooms of difficult access.

Installation in terraces (reinforcement of the structure is not required).

Space saving in boiler room (464 kW in less than 0.76 m

2

).

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2. General Regulations / Application / Norms and Regulations

General regulations

This documentation contains important information, which is a base for safe and reliable installation,

commissioning and operation of the Adinox Low Temperature Boiler. All activities described in this

document may only be executed by authorized companies.

Changes to this document may be effected without prior notice. We accept no obligation to adapt

previously delivered products to incorporate such changes.

Only original spare parts may be used when replacing components on the boiler, otherwise warranty will

be void.

Application

The Adinox Low Temperature Boiler may be used for heating and hot water production purposes only. The

boiler should be connected to closed systems with a maximum temperature of 100ºC (high limit

temperature); maximum set point temperature is 90ºC.

Norms and regulations

When installing and operating the boiler, all applicable norms (European and local) should be fulfilled:

• Local building regulations for installing combustion air and flue gas systems;

• Regulation for connecting the boiler to the electrical appliance;

• Regulations for connecting the boiler to the local gas network;

• Norms and regulations according to safety equipment for heating systems;

• Any additional local laws/regulations with regard to installing and operating heating systems.

− 92 / 42 / EEC Boiler efficiency directive − 90 / 396 / EEC Gas appliance directive − 73 / 23/ EEC Low

voltage directive − 89 / 336 / EEC EMC directive

− EN 656 Gas-fired central heating boilers – Type B boilers of nominal heat input exceeding 70 kW but not

exceeding 300 kW

− EN 15420 Gas-fired central heating boilers - Type C boilers of nominal heat input exceeding 70 kW, but

not exceeding 1000 kW

− EN 15417 Gas-fired central heating boilers - Specific requirements for condensing boilers with a nominal

heat input greater than 70 kW but not exceeding 1000 kW

− EN 13836 Gas fired central heating boilers - Type B boilers of nominal heat input exceeding 300 kW, but

not exceeding 1000 kW

− EN 15502-1 Gas-fired central heating boilers - Part 1: General requirements and tests

− EN 55014-1 Electromagnetic compatibility - Requirements for household appliances, electric tools and

similar apparatus Part 1: Emission

− EN 55014-2 Electromagnetic compatibility - Requirements for household appliances, electric tools and

similar apparatus Part 2: Immunity - Product family standard

− EN 61000-3-2 Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current

emissions (equipment input current 16 A per phase)

− EN 61000-3-3 Electromagnetic compatibility (EMC) - Part 3-3: Limitation of voltage changes, voltage

fluctuations and flicker in public low-voltage supply systems, for equipment with rated current 16 A per

phase and not subject to conditional connection

− EN 60335-1 Household and similar electrical appliances -Safety - Part 1: General requirements

− EN 50165 Household and similar electrical appliances -Safety - Part 2-102: Particular requirements for

gas, oil and solid-fuel burning appliances having electrical connections

The following Codes of Practice are also applicable: -

BS 6644 : 2011 Specification for gas fired hot water boilers of rated inputs between 70kW (net) and 1.8MW

(net) (2

nd

and 3

rd

family gases).

BS 6880:1988 Code of Practice for low temperature hot water heating systems of output greater than 45kW.

Parts 1, 2 & 3.

BS 6891:2005 + A2:2008 Specification for installation of low-pressure gas pipework of up to 35mm (R11/4)

in domestic premises (2

nd

family gases).

BS 7593:2006 Code of Practice for treatment of water in domestic hot water central heating systems.

BS 7671:2008 Requirements for electrical installations. IEE Wiring Regulations. Seventeenth Edition

BS EN 12828 2003 Heating systems in buildings – Design for water based heating systems.

CISBE Guide reference sections B7, B11 and B13.

CP342 Part 2: 1974 Code of Practice for centralized hot water supply.

IGE/UP/1 or 1A Gas Tightness Testing & Purging of Commercial Industrial Gas Installations

IGE/UP/2 Gas installation pipework, boosters and compressors on Industrial and Commercial premises.

IGE/UP/4 Commissioning of gas fired plant on industrial and commercial premises.

IG/UP/10 edition 3 Installation of gas appliances in Industrial and Commercial premises.

ADI HT boiler - Technical Manual

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Part 1: Flued appliances.

Through their unique construction, the Adinox Low Temperature Boiler range of central heating units are

renowned for their:

- High thermal output

- Environmental-friendliness (they meet the most stringent environmental conditions)

- Low weight and compact size

- Durability

- Low noise level

- Broad control range

- Can be supplied in a wide range of models

Through active and market oriented research, MHS Boilers Ltd is in a position to offer solutions for the

most challenging heating requirements.

The Supplier

MHS Boilers Ltd are proud to supply and technically support the Adinox Low Temperature Boiler Range of

boilers throughout the United Kingdom. For advice or more information please contact your local sales

representative or our head office via 01268 546700. or via our website www.mhsboilers.com

This Document

The present documentation has been prepared with the following target groups in mind:

The technical consultant

The installer

The maintenance technician

The User

MHS Boilers Ltd has opted to make the technical documentation as comprehensive as possible in the form

of this book, in order to ensure that these target groups have all the information they need. As the supplier

we would be happy to help you in connection with any additional information that you may require. This

document covers the following aspects relating to the boilers:

General description

Technical specifications

Requirements for design and installation

Maintenance instructions

The operating instructions for the user have been affixed to the appliance itself.

Service

For commissioning and assistance in maintenance matters, please contact the Technical Services

Department via 01268 546772

General restrictions

MHS Boilers Ltd products should always be used, installed and maintained in accordance with the

statutory requirements, specifications and standards applicable to these installations. All the data,

information and suggestions concerning its products provided by MHS Boilers Ltd are based on careful

study. However, the use, installation and operation of the same are outside the control of MHS Boilers Ltd

and neither MHS Boilers Ltd nor any other organisations associated with it, accept any liability for the

same.

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2. REGULATIONS

The installation must be designed and realized by qualified professionals in accordance with the current regulations

referring to gas, air venting, flues evacuation, electricity, safeties, fire prevention, etc.

The boiler maintenance must be realized following the instructions of the manufacturer’s technical manual and with

a minimum regularity as indicated by the current regulations.

3. EEC APPROVALS AND CERTIFICATIONS

ADI-Nox boilers, model ADI HT, are certified as follows:

MODEL

ADI HT

105 to 400

475 to 750

850 to 950

GAS BOILERS

DIR. 90/396/EEC

1312CL5484

(AND EFFICIENCY DIR.

92/42/EEC)

1312CL5487

1312BQ4283

The European Directive of Boilers Efficiency, dir. 92/42/EEC, only applied to boilers from 4 to 400 kW.

ADI HT boiler - Technical Manual

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4. BOILER GENERAL VIEW: DESCRIPTION OF THE COMPONENTS

A

Boiler heat exchanger (higher collector)

B

Flanges (boiler heat exchanger – burner – air/gas fan)

C

Ignition-ionization kit

D

Flame indicator

E

Motor fan (variable speed)

F

Fan

G

Venturi for air inlet and mix with gas

H

Gas shut-off valve

J

Boiler control unit and power modulation

L

Hot water flow

M

Hot water return

N

Flues outlet

P

Gas connection

Q

Air pressure switch

R

Air filter

S

Ignition transformer

T

Gas pressure switch

U

Pressure sensor

V

Air vents (manual)

Models ADI HT 105 to 200 (view from above):

(B)

(D)

(F)

(E)

(C)

(S)

(Q)

(H)

(P)

(T)

(U)

(L)

(M)

(V)

ADI HT boiler - Technical Manual

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Models ADI HT 250 and higher:

(A)

(C)

(D)

(B)

(J)

(H)

(G)

(F)

(E)

(R)

(S)

ADI HT boiler - Technical Manual

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5. DIMENSIONS

12

9b

9a

8

7

12

9b

9a

8

7

AA

4

6

5

AA

4

5

6

LA

F

AL

LF

L2

L1

AL

GL

245 205

HF

HA

HG

SB

H

HF

HA

HG

H

SB

A

ADI

HT

A

AA

AL

F (7)

H

HA

HF

HG

L1

L2

LA

LF

GL

mm

105

350

185

82.5

150

1110

774

198

915

595

510

66

121

151.5

130

450

185

112.5

150

1110

774

198

963

595

510

66

121

134.3

150

450

185

112.5

150

1110

774

198

963

615

530

66

121

134.3

200

450

185

112.5

150

1110

774

198

963

635

546

66

121

134.3

250

660

305

177.5

175

1583

937

403

1156

940

775

61

134

217.3

275

660

305

177.5

175

1583

937

403

1156

940

775

61

134

217.3

325

810

360

225

250

1583

936

445

1156

940

775

61

134

292

400

810

360

225

250

1583

936

445

1190

940

775

61

134

249.3

475

810

360

225

250

1583

936

445

1190

940

775

61

134

249.3

(*) Attention: Heights H, HG, HA, HF, without taking into consideration the increase due to the silent-block feet

supplied with the boiler (dimension “SB”).

Note: data in the present document are liable to changes without prior warning.

L1

L2

12

9b

9a

AL

AA

F

7

4

6

5

A

LF

LA

GL

HF

HA

HG

H

SB

ADI HT

250 - 475

ADI HT 105

ADI HT 130-150-200

ADI HT boiler - Technical Manual

11 L349

Gas connection: the installation company must install a female 3-pieces coupling, for an easier dismantling and

maintenance of the boiler.

Add gas filter.

ADI HT 550 - 950

L2

L1

SB

LF

HF

12

9b

9a

8

7

F

AA

4 5

HA

H

HG

A LA

AL

GL

6

ADI

HT

A

AA

AL

F (7)

H

HF

HA

HG

L1

L2

LA

LF

GL

mm

550

1040

400

320

350

1628

487

1060

1396

940

775

82

140

360

650

1040

400

320

350

1628

487

1060

1396

940

775

82

140

360

750

1040

400

320

350

1628

487

1060

1396

940

775

82

140

360

850

1040

400

320

350

1658

487

1063

1393

1083

918

60

122

359

950

1040

400

320

350

1658

487

1063

1393

1083

918

60

122

359

(*) Attention: Heights H, HG, HA, HF, without taking into consideration the increase due to the silent-block feet

supplied with the boiler (dimension “SB”).

Note: data in the present document are liable to changes without prior warning.

ADI HT

4-5

6

9

12

Diam.

105

2", threaded

3/4"

3/4”

½” F

130

2", threaded

1"

3/4”

½” F

150

2", threaded

1"

3/4”

½” F

200

2", threaded

1"

3/4”

½” F

250

2 ½", to be flanged (PN 6)

1"1/4

1”1/2

½” M

275

2 ½", to be flanged (PN 6)

1"1/4

1”1/2

½” M

325

2 ½", to be flanged (PN 6)

1"1/4

1”1/2

½” M

400

2 ½", to be flanged (PN 6)

1"1/4

1”1/2

½” M

475

2 ½", to be flanged (PN 6)

1"1/4

1”1/2

½” M

550

4", to be flanged (PN 10)

1"1/4

1”1/2

½” M

650

4", to be flanged (PN 10)

1"1/4

1”1/2

½” M

750

4", to be flanged (PN 10)

1"1/4

1”1/2

½” M

850

4", to be flanged (PN 10)

1"1/4

1”1/2

½” M

950

4", to be flanged (PN 10)

1"1/4

1”1/2

½” M

Legend

Concept

4

Hot water flow

5

Hot water return

6

Gas connection (female)

7

F

Flues outlet (connection to

chimney)

8

Anti-vibration supports

9

Boiler water draining (female-

threaded sleeve)

12

Draining of condensed products

(female or male-threaded sleeve)

13

Control panel

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6. TECHNICAL DATA

6.1 Models ADI HT 105 to ADI HT 400

CONCEPT

Units

105

130

150

200

250

275

325

400

Power output

Maximum power

(average water

temp: 70ºC)

kW

104

130

149.3

190

230

262

322

380

Power output

Minimum power

(average water

temp: 60ºC)

kW

31.9

40

45.7

58.5

70.3

80.1

98.4

116

Power input

Maximum

kW

109.6

138

157.2

200

242.3

270

334

396

Minimum

kW

32.9

41.4

47.2

60

72.7

81

100.2

118.8

Natural Gas

Gas flow Max.

m3/h

10.2

12.8

14.6

18.6

22.5

25.1

31

36.8

(G20)

Flues flow

m3/h

238

300

341

434

550

614

759

899

Flues Residual

Press.

Pa

18.9

64.8

90

67.5

54

70.8

90

Boiler weight without water

kg

110

112

123

139

330

350

440

445

Water capacity

litres

30

33

36

76

85

99

106

Max. water pressure

bar

5

Water

ΔT = 10ºC

m3/h

8.9

11.2

12.8

16.3

19.8

22.5

27.7

32.7

flow

ΔT = 12ºC

m3/h

7.5

9.3

10.7

13.6

16.5

18.8

23.1

27.2

rate

ΔT = 15ºC

m3/h

6

7.5

8.6

10.9

13.2

15

18.5

21.8

Electric

consumption

At max. output

W

134

182

222

129

201

177

342

445

At min. output

W

24

31

41

26

36

22

60

79

Maximum

consumption

W

255

268

282

256

314

259

342

445

Supply

V

1x230 V

Natural gas L.C.V. = 10.757 kW/m3 (38.728 MJ/m

3

). Natural gas pressure: min. 15 mbar / max. 45 mbar.

Propane gas = CONSULT

Electric supply to the boiler: 230 V, 50 Hz, single-phase and ground.

The electric protection of each boiler must be prepared considering the maximum value between the electric

consumption at the start-up and the electric consumption at the maximum power output.

ADI HT 105 to ADI HT 400: modulating power from 30%.

Minimum return water temperature to the boilers: 60ºC.

Note: data in the present document are liable to changes without prior warning.

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6.2 Models ADI HT 475 to ADI HT 950

CONCEPT

Units

475

550

650

750

850

950

Power output

Maximum power

(average water

temp: 70ºC)

kW

464

545

616

695

804

905

Power output

Minimum power

(average water

temp: 60ºC)

kW

141.6

166.9

187.7

211.1

244.5

367.7

Power input

Maximum

kW

483.3

563.6

638.3

720.2

829

942.7

Minimum

kW

145

169.1

191.5

216.1

249

377.1

Natural Gas

Gas flow Max.

m3/h

44.9

52.4

59.3

67

77.1

87.6

(G20)

Flues flow

m3/h

1098

1170

1321

1491

1771

2014

Flues Residual

Press.

Pa

90

69

72

75

180

270

Boiler weight without water

kg

460

480

485

545

Water capacity

litres

118

120

164

Max. water pressure

bar

5

Water

ΔT = 10ºC

m3/h

39.9

46.9

53

59.8

68.8

77.8

flow

ΔT = 12ºC

m3/h

33.3

39.1

44.1

49.8

57.3

64.9

rate

ΔT = 15ºC

m3/h

26.6

31.2

35.3

39.8

45.9

51.9

Electric

consumption

At max. output

W

727

668

859

1165

1185

1850

At min. output

W

81

86

115

124

132

329

Maximum

consumption

W

727

668

859

1165

1185

1850

Supply

V

1x230 V

3x380 V

Natural gas L.C.V. = 10.757 kW/m3 (38.728 MJ/m

3

). Natural gas pressure: min. 15 mbar / max. 45 mbar.

Propane gas = CONSULT

Electric supply to the boiler:

ADI HT 475 – 850: 230 V, 50 Hz, single-phase and ground.

ADI HT 950: 380 V, 50 Hz, three-phase and ground.

ADI HT electric current

Maximum power

Minimum power (40%)

ADI HT 950

2.82 amp

0.36 amp

The electric protection of each boiler must be prepared considering the maximum value between the electric

consumption at the start-up and the electric consumption at the maximum power output.

ADI HT 475 to ADI HT 850: modulating power from 30%.

ADI HT 950: modulating power from 40%.

Minimum return water temperature to the boilers: 60ºC

Note: data in the present document are liable to changes without prior warning.

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7. BOILER HEAT EXCHANGER

The boiler heat exchanger (flues-water) is made of steel.

The boiler heat exchanger consists of 2 water collectors,

an upper one and a lower one, connected by means of

multiple vertical tubes forming the combustion chamber.

The vertical tubes generate a big heat transfer surface that

uses the sensible heat of the flues.

During the manufacturing process, the boiler is subjected

to a strict quality control, realized through a process of

three leak tests: one with penetrant liquids, another one

with air pressure and the last one with water pressure.

The boiler heat exchanger is insulated.

Several manual air vents are installed in the higher part of

the boiler for the air venting of the boiler.

Front and rear view: models ADI HT 200 and lower Front and rear view: models ADI HT 250 and higher

8. POWER MODULATION AND COMBUSTION SYSTEM

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12

11

7

15

1

5

13

15

5

11

14

6

7

3

2

8

9

4

10

NOTE: this is a guide diagram; according to the model, the position of electrodes, pilot flame, motor fan and gas

shut-off valve can vary.

Gas filter in models ADI HT 850 and 950:

In these models, the gas filter is supplied dismantled inside the boiler, for an

easier and safer transport.

It must be assembled once the boiler is in the plant.

The minimum gas pressure gauge is connected to the gas filter inlet.

In order to rotate the motor-fan group and take off the burner, you have to

remove first the gas filter and then proceed according to the instructions

indicated on the corresponding paragraph.

(1) Burner of fire resisting alloy mesh

(2) Ionization electrode (checking the flame

presence)

(3) Ignition electrode

(4) Pilot flame

(5) Venturi for the air-gas mix

(6) Double gas shut-off valve

(7) Gas inlet (boiler gas connection to the

installation)

(8) Fan for the air-gas mix

(9) Variable speed motor fan

(10) Air inlet

(11) Flange of the group motor-fan, to be coupled

to the flange of the boiler heat exchanger

(12) Ignition-ionization kit

(13) Pressure connection for the gas valve (just

models HT 250 and higher)

(15) Air filter (just models HT 250 and higher)

ADI HT boiler - Technical Manual

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8.1 Assembly of gas connection – air/gas inlet

The ADI HT boiler includes an air-gas premix system of modulating combustion, composed of:

1

B

8-9

2

6

6b

6a

7

15

Pa

5

13

Pg

10

V. Venturi operating as an air-gas mixer, ensuring combustion with a constant proportion of air/gas to the

premix burner, throughout its power modulation range.

The venturi produces a depression and drives the gas (G) towards the gas valve outlet (VV).

It operates as an additional safety: if there is no air inlet, there will be no gas admission.

VV. The gas shut-off valve regulates the gas outlet pressure according to the pressure value in the venturi.

Note: (13) in models HT 250 and higher: a coupling pipe between the gas shut-off valve and the venturi

measures the pressure drop before the mix. For lower models there is no pipe, the connection between the gas

shut-off valve and the venturi is internal.

M. The power modulation is realized by varying the fan speed, which also produces a variation of the

air-gas mix flow entering into the burner (B).

Pg. Minimum inlet pressure switch: adjusted at 15 mbar.

In Models ADI HT 105 to 200: these pieces form one only

global group: burner, burner-holder plate, motor-fan, venturi and

gas shut-off valve.

ADI HT boiler - Technical Manual

17 L349

Exploded view of the assembly burner – fan – gas valve for models HT 250 and higher:

Motor-fan rotating backward or

forward depending on the model.

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8.2 Air inlet filter

The air inlet to the venturi is protected by a filter retaining the dust that is

usually in the atmosphere.

Attention: it is important to avoid excessively dusty or dirty environments

(for ex. in case of building work in the same room or in places next to the

ventilation ducts of the boiler room) or environments with aggressive steams

(evacuation or air outlet of industrial laundries...).

See an example of the filter in the attached photo.

Just included in models HT 250 and higher.

8.2.1 Optional air filter for ADI little size

Optional air filter for ADI HT 130 to 200:

General view not assembled to boiler View assembled to the boiler (from above)

View of the lower part of the filter once assembled to the boiler

Optional air filter for ADI HT 105:

ADI HT boiler - Technical Manual

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9. BURNER

The boiler includes an air-gas premix burner of innovative design and material:

Fire resisting alloy mesh.

Homogeneous and stable combustion in case of any change in the power demand.

High mechanic resistance and high resistance to high temperatures.

Very low thermal inertia  fast cooling (for an easier maintenance).

Fast answer to the changes of the power demand.

Thanks to its structure and design, noise produced by the combustion is very low and without resonance.

The cylindrical shape of the burner allows the flame to be homogeneously distributed. It is vertically introduced in

the boiler.

The boiler incorporates an ionization flame control. The minimum ionization value must always be superior to 5

microamperes.

9.1 Ignition and ionization kit

The ignition is electronic by means of

an electric transformer that produces

a train of sparks on the ignition

electrode (3), with the special feature

that the sparks fly from the electrode

to the mass included in this electrode,

and not on the burner.

The safety of flame presence is realized

by means of an ionization electrode (2).

The minimum ionization value must be

always higher than 5 microamperes.

Flame may be checked through the

glass spy (4).

(16) Electrodes holder plate

(17) Gasket for the set

ADI HT

Inclination

(X)

ELECTRODE/PROBE

Length (mm)

105 – 275

9º

340

325 – 475

5.5º

550 – 950

7º

380

17

16

3

4

2

.

X

ADI HT boiler - Technical Manual

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10. CONTROL PANEL - SIEMENS

The boiler control panel is placed in the upper part of the boiler front.

ITEM

CONCEPT

1

RESET

Button for boiler reset when pressing > 0,5 s.

2

D.H.W. on/off

3

7471z49/0109

Select heating circuit mode. Change the operation mode:

Automatic mode: Circuit works according to the time program

Continuous operation according to Comfort setpoint

Continuous operation according to Reduced setpoint

Standby: circuit is disconnected, Frost Protection function activated

4

7471z54/0109

Available information is displayed by pressing the Info button

5

7471z51/0109

Turn the setting knob to select parameters.

For heating circuits, turn the setting knob to increase or decrease the Comfort

setpoint

7

4

7

1

4

7

e

/

0

2

0

9

Selection of heating operation mode

Display of information

Confirmation of setting

Chimney sweep function

safety limit thermostat test

Quitting the setting

Manual Operation

RESET

Selection of DHW heating mode

(A)

(B)

(A) Boiler on/off switch (B) Display: readings, messages, errors...

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