Unical TRISTAR 3G Installation guide

Brand: Unical

Model: TRISTAR 3G

Type: Installation guide

INSTALLATION

AND MAINTENANCE

INSTRUCTIONS

45137 - 09/15

rev. 1

TRISTAR 3G 2S

General Information

TABLE OF CONTENTS

1 GENERAL INFORMATION ................................................................................................................................................................................. 3

1.1 Symbols used in the manual ........................................................................................................................................................................ 3

1.2 Appropriate use of appliance........................................................................................................................................................................ 3

1.3 Water treatment............................................................................................................................................................................................. 3

1.4 Information for user or system manager ...................................................................................................................................................... 3

1.5 Safety warnings ............................................................................................................................................................................................. 4

1.6 Technical data plate ...................................................................................................................................................................................... 5

1.7 General warnings .......................................................................................................................................................................................... 6

2 TECHNICAL FEATURES AND DIMENSIONS ................................................................................................................................................... 7

2.1 Technical features ......................................................................................................................................................................................... 7

2.2 Main components .......................................................................................................................................................................................... 7

2.3 Smoke turbulators ......................................................................................................................................................................................... 8

2.4 Dimensions .................................................................................................................................................................................................... 9

2.5 Operating data according to UNI 10348 .................................................................................................................................................... 14

3 INSTALLATION INSTRUCTIONS ..................................................................................................................................................................... 15

3.1 General warnings ....................................................................................................................................................................................... 15

3.2 Installation standards ................................................................................................................................................................................ 16

3.3 Handling ..................................................................................................................................................................................................... 17

3.4 Positioning in boiler room .......................................................................................................................................................................... 17

3.5 Burner ......................................................................................................................................................................................................... 17

3.5.1 - Choosing the burner ...................................................................................................................................................................... 17

3.5.2 Installing the burner ......................................................................................................................................................................... 18

3.6 Connecting flame sight glass to burner .................................................................................................................................................... 18

3.7 Furnace door adjustment, opening and closing ....................................................................................................................................... 19

3.7.1 TST 3G 65 2S÷TST 3G 85 2S boilers ............................................................................................................................................. 19

3.7.2 TST 3G 110 2S÷TST 3G 380 2S boilers ......................................................................................................................................... 19

3.7.3 TST 3G 500 2S÷TST 3G 730 2S boilers ......................................................................................................................................... 20

3.7.4 TST 3G 840 2S÷TST 3G 1900 2S boilers ...................................................................................................................................... 20

3.7.5 Important note .................................................................................................................................................................................. 20

3.8 Connecting flue exhaust pipe .................................................................................................................................................................... 21

3.9 Condensation drainage ............................................................................................................................................................................. 21

3.10 Connecting boiler to system...................................................................................................................................................................... 22

3.10.1 Recirculation pump ....................................................................................................................................................................... 22

3.11 Filling the system ....................................................................................................................................................................................... 22

3.12 Connecting gas .......................................................................................................................................................................................... 23

3.13 Packaging ................................................................................................................................................................................................... 24

3.14 Assembling casing ..................................................................................................................................................................................... 25

3.15 Electrical connections................................................................................................................................................................................ 34

3.16 Panel board ................................................................................................................................................................................................ 35

3.17 Hydraulic and electric system connection ................................................................................................................................................ 36

3.18 Optional panel board ................................................................................................................................................................................. 38

3.19 Layout of probe connection on heating control ........................................................................................................................................ 39

3.20 Programming heating controller ................................................................................................................................................................ 39

3.21 Hydraulic and electric system connection with optional panel board ..................................................................................................... 42

3.22 Commissioning .......................................................................................................................................................................................... 44

3.23 Adjusting the burner .................................................................................................................................................................................. 45

3.24 Removing flue gas turbulators .................................................................................................................................................................. 45

4 INSPECTIONS AND MAINTENANCE .............................................................................................................................................................. 46

Inspection and maintenance instructions ......................................................................................................................................................... 46

Boiler body maintenance ................................................................................................................................................................................... 47

Maintenance of burner ....................................................................................................................................................................................... 47

Checking ignition electrode ............................................................................................................................................................................... 47

Components to check during yearly inspection ................................................................................................................................................ 47

General Information

1.1 - SYMBOLS USED IN THE MANUAL

Pay special attention when reading this manual to the parts marked by the symbols:

NOTE!

Suggestions for the user

ATTENTION!

Possible hazardous situation

for the product and the environment

DANGER!

Serious danger for

personal safety and life

1.2 - APPROPRIATE USE OF APPLIANCE

The TRISTAR 3G 2S appliance has been built according to the current level of engineering and

acknowledged technical safety rules.

Nonetheless, if improperly used, dangers could arise for the safety and the very life of the user and other

persons or damage to the equipment or other objects.

The appliance is intended to operate in hot air circulation heating systems.

Any other use must be considered improper.

UNICAL shall not be held liable for any damage resulting from improper use; in this case the user is fully

responsible for the risk.

Use according to the intended purposes also includes careful compliance with the instructions in this

manual.

1.3 - WATER TREATMENT (see specific booklet)

• The hardness of the feed water conditions the frequency at which the domestic hot water exchanger must be

cleaned.

• If the water has a hardness greater than 15°f, we recommend using water softeners, chosen according to the

characteristics of the water.

• We recommend checking and cleaning the domestic hot water exchanger at the end of the first year of use and

every two years thereafter; on this occasion, also check the state of wear of the anode.

1.4 - INFORMATION FOR SYSTEM MANAGER

• The user must be instructed concerning the use and operation of his heating system, in particular:

• Deliver these instructions to the user, as well as other documents concerning the appliance inserted in the

envelope contained in the packaging. The user must keep this documentation so that it is available for

further consultation.

• Inform the user about the importance of the air vents and the flue gas exhaust system, highlighting their essential

features and the absolute prohibition of modifying them.

• Inform the user concerning controlling the system’s water pressure as well as operations to restore it.

• Inform the user concerning correct temperature control, control units/thermostats and radiators for saving

energy.

• Remember that the system must receive regular maintenance at least once a year and a combustion analysis

must be performed in the timetable foreseen by standards in force.

• Should the appliance be sold or transferred to a new owner or if you move and leave the appliance, always make

sure that the instruction booklet accompanies it in order to be consulted by the new owner and/or installer.

GENERAL INFORMATION

Attention: this manual contains instructions for the exclusive use of the professionally qualified installer

and/or maintenance technician in compliance with current legislation.

The user is NOT qualified to intervene on the boiler.

The manufacturer will not be held liable in case of damage to persons, animals or objects resulting from

failure to comply with the instructions contained in the manuals supplied with the boiler.

General Information

1.5 - SAFETY WARNINGS

ATTENTION!

The appliance must be installed, adjusted and maintained by professionally qualified personnel, in

compliance with standards and provisions in force. Incorrect installation can cause damage to persons,

animals and objects for which the manufacturer cannot be held responsible.

DANGER!

NEVER attempt performing maintenance or repairs on the boiler on your own initiative.

Any work must be done by professionally qualified personnel.

We recommend stipulating a maintenance contract.

Insufficient or irregular maintenance can jeopardise the operating safety of the appliance and cause

damage to persons, animals and objects for which the manufacturer cannot be held responsible.

Modifying parts connected to appliance

Do not modify the following parts:

- the boiler

- the gas, air, water and electricity lines

- flue gas pipe, safety valves and heating water drain pipe

- construction parts which affect the operating safety of the appliance

Attention!

To tighten or loosen the screwed fittings, use only appropriate fixed spanners.

Incompliant use and/or inappropriate tools can cause damage (e.g. water or gas leakage).

ATTENTIO!

Indications for propane gas-fired appliances

Make sure that the gas tank has been deaerated before installing the appliance.

For state-of-the-art deaeration of the tank, contact the LPG supplier or a person qualified in compliance with law.

If the tank has not been professionally deaerated, ignition problems could arise.

In that case, contact the supplier of the LPG tank.

Smell of gas

Should a smell of gas be perceived, follow these safety guidelines:

- do not turn electric switches on or off

- do not smoke

- do not use the telephone

- close the gas shut-off valve

- air out the area where the gas leakage has occurred

- inform the gas supplier or a company specialised in installation and maintenance of heating systems.

Explosive and easily flammable substances

Do not use or store explosive or easily flammable materials (e.g. petrol, paints, paper) in the room where the

appliance is installed.

General Information

CE marking

The CE markings certifies that the boilers meet:

- The essential requirements of the gas appliance directive

(90/396/EEC)

- The essential requirements of the electromagnetic

compatibility directive (89/336/EEC)

- The essential requirements of the efficiency directive (92/

42/EEC)

1.6 - TECHNICAL DATA PLATE

The technical data plate is adhesive and is included in the document case; it must be applied by the installer on the

outside of the casing.

The serial number of the boiler is on the riveted plaque on the front plate of the body (front right bottom side).

General Information

1.7 - GENERAL WARNINGS

The instruction booklet is an integral and essential part of the

product and must be kept by the user or system manager.

Read the warnings contained in this instruction booklet carefully

as they provide important guidelines regarding installation, use

and maintenance safety.

Keep the booklet with care for further consultation.

Installation and maintenance must be performed in compliance

with standards in force according to the instructions of the

manufacturer and by qualified and certified personnel in

compliance with law.

By professionally qualified personnel we mean: personnel with

specific technical skill in the field of heating system components

for civil use, domestic hot water production and maintenance.

Personnel must have the qualifications foreseen by current

legislation.

Incorrect installation or improper maintenance can cause damage

to persons, animals or objects for which the manufacturer is

not responsible.

Before performing any cleaning or maintenance, disconnect

the appliance from the energy mains by acting on the switch of

the system and/or through the specific cut-off devices.

Not obstruct the terminals of the intake/exhaust ducts.

In case of failure and/or malfunctioning of the appliance, switch

it off and do not try to repair it or intervene on it directly.

Contact only personnel qualified in compliance with law.

Any repairs must be performed solely by personnel authorised

by Unical using original spare parts only. Failure to comply

with the above can jeopardise the safety of the appliance.

To guarantee appliance efficiency and its correct operation,

yearly maintenance must be performed by qualified personnel.

Should you decide not to use the appliance, parts entailing

potential sources of hazard must be made safe.

Should the appliance be sold or transferred to a new owner or

if you move and leave the appliance, always make sure that

the instruction booklet accompanies it in order to be consulted

by the new owner and/or installer.

Only original accessories must be used for all appliances with

optionals or kits (including electric).

This appliance is intended solely for the use for which it was

expressly designed. Any other use is to be considered improper

and therefore dangerous.

Technical features and dimensions

2.1 - TECHNICAL FEATURES

TRISTAR 3G 2S boilers are made up of an external shell (oval-

shaped in models from TST 3G 65 2S to TST 3G 840 2S)

(cylindrical-shaped in models from TST 3G 1100 2S to

TST 3G 1900 2S) which houses the completely wet cylindrical

furnace, where the first combustion gas pass takes place, and

by a special tube and shell, used for the second and third pass.

A special manifold-distributor, positioned near the system’s

return and flow stub pipes, optimises water circulation and

reduces stratification, providing a more even distribution of water

temperature inside the boiler body.

The guided path of the combustion gas exploits the thermal

exchange surfaces to a maximum and evenly balances strains

on the materials.

The tube and shell is positioned on the top and hottest part of the

boiler to reduce the temperature differential between combustion

gas and primary fluid, thus limiting the formation of condensation,

which causes corrosion and quick deterioration of traditional

boilers.

TRISTAR 3G 2S boilers have been designed and approved to

operate within an output range allowing them to perfectly adapt

to the design heat output.

The construction fully complies with prescriptions laid down in

EN 303 part 1.

The components of the pressurised part, such as sheets and

pipes, are made in certified carbon steel, according to the

EURONORM 25 and EURONORM 28 tables.

Welding devices and procedures are approved by TÜV (D) -

UDT (PL) - SA (S) and ISPESL (I).

Up until model TRISTAR 3G 380 2S, the furnace is bonded to

the rear tube plate.

For models TRISTAR 3G 500 2S ÷ TRISTAR 3G 1900 2S, the

furnace is free to expand (it is only sustained by the front tube

plate).

The boilers are equipped with an opening door on the right or

left.

The outer shell is covered with a glass wool insulation mattress

100 mm thick (80 mm for models TRISTAR 3G 65 2S and

TRISTAR 3G 85 2S), in turn protected by a mineral fibre fabric.

The top part of the shell is provided with hooks for lifting the

boiler.

Note: TRISTAR 3G 2S boilers are intended to operate with ON/

OFF type GAS burners; as an alternative, they can be equipped

with a dual-stage or modulating burner, as long as the minimum

heat output in the first flame or in modulation does not drop

below 60% the furnace load.

The boilers are provided with two ½” attachments for conduits

with an inside diameter of 15 mm (suitable to house 3 bulbs

each).

The shell has holes at the sides for the cable glands of the

power, pumps, burner cables and those of any other auxiliary

device.

TECHNICAL FEATURES

AND DIMENSIONS

2.2 - MAIN COMPONENTS

TRISTAR 3G 2S boilers are equipped with a cylindrical

furnace in which the combustion gases, developed

in the central flame, enter the return tube/s

of the second pass and, having reached the front part,

are sent through the door into the tubes of the

third pass to reach the rear flue gas chamber

and then the chimney.

The combustion chamber is always

pressurised while the burner is operating,

within the output range of the boiler.

For the value of this pressure, see

the tables on pages 9÷13, at the column

“Flue gas pressure drops”.

The chimney must be calculated so that

no positive pressure is detected

on its base

1 Furnace

2 Smoke pipes with smoke diverters

3 Door with flame sight glass

4 Smoke chamber

5 Body insulation

6 Panel board

fig. 1

Technical features and dimensions

2.3 - SMOKE

TURBULATORS

TRISTAR 3G 2S boilers are designed to

be used within an output range in order to

improve seasonal efficiency and coupling

with each heating system.

The heat output must therefore be

adjusted upon commissioning, based on

the guidelines of the Thermotechnical

Engineer, and always within the range

provided for each boiler on pages 9 - 13,

by the burner technician who will

determine the fuel flow rate.

In all cases, make sure that the

turbulators are positioned inside their

respective smoke pipes.

While operating the boiler at minimum

output, the flue gas temperature must not

be lower than 160°C.

If not, make sure that all the turbulators

are inside the respective smoke pipes

before contacting our After-Sales Service.

The burner must be commissioned under

the responsibility of a qualified burner

technician authorised by the manufacturer.

On that occasion, a complete operating

report must be drafted.

fig. 2

Technical features and dimensions

n°4x M8 at 45°

on ø 170

ø 132

Fiber wool

Ceramic fiber

ø 130

n°4 "L"

BF E

120

2.4 - DIMENSIONS - TST 3G 65 2S - TST 3G 85 2S

1 Panel board

2 Smoke chamber cleaning door

3 Flame sight glass

T1 Central Heating flow

T2 Central Heating return

T3 Expansion vessel connection

T4 Boiler drain

T5 Chimney connection

T6 Burner connection

T7 Condensation drain

DETAIL FOR DOOR DRILLING

TST 3G 65 2S - TST 3G 85 2S

Nominal

output

55÷65

72÷85

CONNECTIONS

ISO 7/1

Øi

Rp 1½

Rp 1

Rp ¾

150

132

TST 3G 65 2S

TST 3G 85 2S

TRISTAR 3G 2S

Model

Nominal

input

58,2÷69,2

76,1÷90,3

Boiler

capacity

131

187

Water

pressure

drops(**)

m w.c.

0,04÷0,06

0,05÷0,07

4,6÷6,4

5,4÷7,5

Flue gas

pressure

drop

mm w.c.

Maximum

boiler

working

pressure

bar

Weight

315

355

TRISTAR 3G 2S

Model

TST 3G 65 2S

TST 3G 85 2S

DIMENSIONS

740

690

950

190

140

145

660

345

120

470

310

190

846

660

590

850

(*) Minimum dimensions for boiler room access.

(**) Pressure drops corresponding to a thermal drop of 15K.

fig. 4

fig. 3

T 7

Øe

Technical features and dimensions

Fiber wool

Ceramic fiber

Blind burner plate 250x250

Burner plate insulation gasket 250x250

ø 180

ø 165

Fiber wool

Ceramic fiber

Blind burner plate 250x250

Burner plate insulation gasket 250x250

ø 180

ø 150

n°4x M8 at 45°

on ø 170

ø 132

Fiber wool

Ceramic fiber

ø 130

T2-T3-T1

T3 T1

n°4 "L"

Q R

(*) Minimum dimensions for boiler room access.

(**) Pressure drops corresponding to a thermal drop of 15K.

1 Panel board

2 Smoke chamber cleaning door

3 Flame sight glass

T1 Central Heating flow

T2 Central Heating return

T3 Expansion vessel connection

T4 Boiler drain

T5 Chimney connection

T6 Burner connection

T7 Condensation drain

DETAIL FOR DOOR DRILLING

TST 3G 185 - 225 2S

Nominal

output

93÷109

127÷150

157÷185

191÷225

255÷300

323÷380

CONNECTIONS

UNI 2278 PN16

ISO 7/1

Øi

DN 50

DN 65

DN 80

Rp 1¼

Rp 1½

Rp 2

Rp ¾

180

225

132

180

TST 3G 110 2S

TST 3G 150 2S

TST 3G 185 2S

TST 3G 225 2S

TST 3G 300 2S

TST 3G 380 2S

TRISTAR 3G 2S

Modello

Nominal

input

98,1÷115,6

133,6÷158,6

164,9÷195,3

200,2÷237,1

265,9÷314,4

336,8÷398,3

Boiler

capacity

204

270

285

322

408

475

Water

pressure

drops(**)

m w.c.

0,06÷0,08

0,08÷0,10

0,10÷0,18

0,17÷0,20

0,22÷0,35

0,32÷0,53

7÷9,7

11,2÷15,6

14÷19,4

16,6÷23,1

20,5÷28,4

23,6÷32,7

Flue gas

pressure

drop

mm w.c.

Maximum

boiler

working

pressure

bar

Weight

435

515

580

640

840

935

TST 3G 110÷380 2S

fig. 5

fig. 7

DETAIL FOR DOOR DRILLING

TST 3G 110 - 150 2S

fig. 6

DETAIL FOR DOOR DRILLING

TST 3G 300 - 380 2S

fig. 8

T 7

Øe

TRISTAR 3G 2S

Model

DIMENSIONS

820

860

890

885

1145

1080

1210

1275

1470

1082

1182

1352

190

140

145

748

828

928

380

400

440

120

M 8

1210

1310

1485

175

215

255

130

390

210

340

285

480

185

250

315

710

750

780

786

1046

981

1111

1177

1372

TST 3G 110 2S

TST 3G 150 2S

TST 3G 185 2S

TST 3G 225 2S

TST 3G 300 2S

TST 3G 380 2S

130

125

Technical features and dimensions

ø 220

Fiber wool

Ceramic fiber

Blind burner plate 280x280

Burner plate insulation gasket 280x280

ø 220

O P

T2-T3-T1

T3 T1

Q R

T2 Central Heating return

T3 Expansion vessel connection

T4 Boiler drain

T5 Chimney connection

T6 Burner connection

T7 Condensation drain

(*) Minimum dimensions for boiler room access.

(**) Pressure drops corresponding to a thermal drop of 15K.

TST 3G 500÷730 2S

TST 3G 500 2S

TST 3G 630 2S

TST 3G 730 2S

DETAIL FOR DOOR DRILLING

TST 3G 500÷730 2S

Nominal

output

425÷500

535÷630

620÷730

Nominal

input

443,1÷524,1

557,8÷660,3

646,5÷765,2

Boiler

capacity

656

737

807

Water

pressure

drops(**)

m w.c.

0,10÷0,15

0,16÷0,23

0,23÷0,33

1 Panel board

2 Smoke chamber cleaning door

3 Flame sight glass

T1 Central Heating flow

Flue gas

pressure

drop

mm w.c.

27,3÷37,8

33,5÷46,5

37,5÷52

Maximum

boiler

working

pressure

bar

Weight

1260

1375

1510

CONNECTIONS

UNI 2278 PN16

DN 65

DN 100

ISO 7/1

Rp 1

Øi

250

220

fig. 9

fig. 10

TRISTAR 3G 2S

Model

Øe

DIMENSIONS

920

1605

1800

1995

1645

190

135

195

1110

480

1735

298

435

630

825

440

790

1505

1790

1895

860

TRISTAR 3G 2S

Model

TST 3G 500 2S

TST 3G 630 2S

TST 3G 730 2S

Technical features and dimensions

Refractory cement

Ceramic fiber

Blind burner plate 330x330

Burner plate insulation gasket 330x330

ø 270

150

T2 Central Heating return

T3 Expansion vessel connection

T4 Boiler drain

T5 Chimney connection

T6 Burner connection

T7 Condensation drain

(*) Minimum dimensions for boiler room access.

(**) Pressure drops corresponding to a thermal drop of 15K.

TST 3G 840 2S

Nominal

output

714÷840

Nominal

input

744,5÷880,5

Boiler

capacity

932

Water

pressure

drops(**)

m w.c.

0,35÷0,52

1 Panel board

2 Smoke chamber cleaning door

3 Flame sight glass

T1 Central Heating flow

Flue gas

pressure

drop

mm w.c.

41,4÷57,3

Maximum

boiler

working

pressure

bar

Weight

1650

CONNECTIONS

UNI 2278 PN16

DN 65DN 100

ISO 7/1

Rp 1¼

Øi

250

270

DETAIL FOR DOOR DRILLING

TST 3G 840 2S

fig. 11

fig. 12

TST 3G 840 2S

TRISTAR 3G 2S

Model

T 7

Øe

O P

T3 T1

T2-T3-T1

125

T7 T7

DIMENSIONS

1122

2115 1432

190

195

1025

480 1540

298 945

440

1020

2014

TST 3G 840 2S

TRISTAR 3G 2S

Model

Technical features and dimensions

Refractory cement

Ceramic fiber

Blind burner plate 380x380

Burner plate insulation gasket 380x380

ø 285

200

Refractory cement

Ceramic fiber

Blind burner plate 330x330

Burner plate insulation gasket 330x330

ø 270

180

UNI 2278 PN16

(*) Minimum dimensions for boiler room access.

(**) Pressure drops corresponding to a thermal drop of 15K.

1 Panel board

2 Smoke chamber cleaning door

3 Flame sight glass

T1 Central Heating flow

T2 Central Heating return

T3 Expansion vessel connection

T4 Boiler drain

T5 Chimney connection

T6 Burner connection

T7 Condensation drain

DETAIL FOR DOOR DRILLING

TST 3G 1100 - 1320 2S

Nominal

output

935÷1100

1122÷1320

1360÷1600

1615÷1900

CONNECTIONS

UNI 2278 PN16

ISO 7/1

Øi

DN 150

DN 175

DN 80

DN 100

Rp 1½

350

400

270

285

Nominal

input

974,9÷1153

1169,9÷1383,6

1418,1÷1677,1

1684÷1991,5

Boiler

capacity

1580

1791

2297

2496

Water

pressure

drops(**)

m w.c.

0,15÷0,21

0,21÷0,30

0,20÷0,28

0,27÷0,39

48,8÷67,5

53,7÷74,3

58,9÷81,6

63,6÷88,1

Flue gas

pressure

drop

mm w.c.

Maximum

boiler

working

pressure

bar

Weight

2530

3065

4005

4230

TST 3G 1100÷1900 2S

fig. 13

fig. 14

DETAIL FOR DOOR DRILLING

TST 3G 1600 - 1900 2S

fig. 15

TST 3G 1100 2S

TST 3G 1320 2S

TST 3G 1600 2S

TST 3G 1900 2S

TRISTAR 3G 2S

Model

Øe

O P

T2 T1

T3-T2-T1

185

T7 T7

DIMENSIONS

1462

1622

2282

2652

2692

3014

1542

1702

190

230

260

290

1120

1245

565

605

1650

1810

561

661

662

510

880

670

990

550

700

1360

1520

2176

2546

2590

2910

TST 3G 1100 2S

TST 3G 1320 2S

TST 3G 1600 2S

TST 3G 1900 2S

TRISTAR 3G 2S

Model

Technical features and dimensions

TST 3G 185 2S

157÷185

164,9÷195,3

95,2÷94,7

95,4÷94,9

96,1÷95,4

0,8÷0,6

3,9÷4,6

0,1÷0,1

80÷95

9,8÷9,8

247,8÷293,5

TST 3G 225 2S

191÷225

200,2÷237,1

95,4÷94,9

95,6÷95,1

96,3÷95,6

0,9÷0,7

3,7÷4,4

0,1÷0,1

76÷91

9,8÷9,8

300,9÷356,4

TST 3G 300 2S

255÷300

265,9÷314,4

95,9÷95,4

96,1÷95,6

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

399,7÷472,7

TST 3G 380 2S

323÷380

336,8÷398,3

95,9÷95,4

96,1÷95,6

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

506,3÷598,7

TST 3G 500 2S

425÷500

443,1÷524,1

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

666,1÷787,8

TST 3G 1320 2S

1122÷1320

1169,9÷1383,6

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

1758,6÷2079,7

TST 3G 1600 2S

1360÷1600

1418,1÷1677,1

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

2131,6÷2520,9

TST 3G 1900 2S

1615÷1900

1684÷1991,5

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

2531,3÷2993,5

Nominal heat output

Nominal heat input

Heat efficiency at nominal load (100%)

Heat efficiency at 30% load

Number of stars (according to 92/42 EEC)

Combustion efficiency at nominal load (100%)

Heat loss at casing (min. - max.)

Heat loss at chimney with burner on (min.-max.)

Heat loss at chimney with burner off (min.-max.)

Flue gas temperature tf-ta (min.-max.)

content

Flue gas mass flow rate (min.-max)

Nominal heat output

Nominal heat input

Heat efficiency at nominal load (100%)

Heat efficiency at 30% load

Number of stars (according to 92/42 EEC)

Combustion efficiency at nominal load (100%)

Heat loss at casing (min. - max.)

Heat loss at chimney with burner on (min.-max.)

Heat loss at chimney with burner off (min.-max.)

Flue gas temperature tf-ta (min.-max.)

content

Flue gas mass flow rate (min.-max)

°C

kg/h

TST 3G 65 2S

55÷65

58,2÷69,2

94,4÷93,9

94,6÷94,1

95,9÷95,1

1,4÷1,2

4,1÷4,9

0,1÷0,1

85÷100

9,8÷9,8

87,6÷104

GAS-FIRED

TST 3G 85 2S

72÷85

76,1÷90,3

94,6÷94,1

94,8÷94,3

95,9÷95,2

1,3÷1,1

4,1÷4,8

0,1÷0,1

84÷99

9,8÷9,8

114,5÷135,8

TST 3G 110 2S

93÷109

98,1÷115,6

94,8÷94,3

95÷94,5

96÷95,2

1,2÷0,9

4÷4,8

0,1÷0,1

83÷98

9,8÷9,8

147,5÷173,8

2.5 - OPERATING DATA ACCORDING TO UNI 10348

°C

kg/h

TST 3G 630 2S

535÷630

557,8÷660,3

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

838,5÷992,6

TST 3G 840 2S

714÷840

744,5÷880,5

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

1119,1÷1323,5

TST 3G 1100 2S

935÷1100

974,9÷1153

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

1465,5÷1733,1

GAS-FIRED

TST 3G 150 2S

127÷150

133,6÷158,6

95÷94,5

95,2÷94,7

96÷95,3

0,9÷0,7

4÷4,7

0,1÷0,1

82÷97

9,8÷9,8

200,8÷238,5

TST 3G 730 2S

620÷730

646,5÷765,2

95,9÷95,4

96,1÷95,6

- -

96,3÷95,6

0,4÷0,2

3,7÷4,4

0,1÷0,1

75÷90

9,8÷9,8

971,7÷1150,2

Installation instructions

INSTALLATION

INSTRUCTIONS

3.1 - GENERAL WARNINGS

ATTENTION!

This boiler is intended solely for the use for

which it was expressly designed.

Any other use is to be considered improper

and therefore dangerous.

This boiler heats water at a temperature

lower than the atmospheric pressure boiling

temperature.

ATTENTION!

The appliances are designed to be installed

inside suitable rooms or technical spaces

only. The appliances cannot be installed or

operate outdoors. Outdoor installation can

cause malfunctioning and be dangerous.

Choose specifically designed appliances for

outdoor installation.

Before connecting the boiler, have professionally

qualified personnel:

a) Thoroughly wash all the piping of the system

to remove any residue or impurities which

could jeopardise proper operation of the

boiler.

b) Check that boiler is set up to operate with

the available type of fuel.

This can be seen written on the package and

on the technical feature plate.

c) Check that the chimney/flue has an appropriate

draught, without any bottlenecks, and that no

exhausts from other appliances are inserted,

unless the flue has been implemented to

accommodate several utilities according to

specific standards and prescriptions in force.

Only after this check can the fitting between

the boiler and chimney/flue be mounted.

ATTENTION!

In rooms with the presence of aggressive

vapours or dust, the appliance must operate

independently from the air inside the instal-

lation room!

ATTENTION!

The appliance must be installed by a qualified

technician with the technical-professional

requirements according to law which,

under his own responsibility, guarantees

compliance with standards according to

good practice rules.

The boiler must be connected to a central heating

system and/or domestic hot water supply network

compatible with its efficiency and output.

Installation instructions

3.2 - INSTALLATION STANDARDS

The appliance must be installed in compliance with the

instructions provided in this manual.

It must be installed by a professionally qualified technician,

who shall assume the responsibility of respecting all

local and/or national laws published in the official journal,

as well as applicable technical standards.

TRISTAR 3G 2S is a steel boiler which can be combined with

air-blown burners fired by gas of category II2H3+.

Contact the gas supplying company before installing the

appliance.

Directives concerning boiler rooms, building regulations and

combustion heating provisions in the country of installation must

also be respected.

The appliance must be installed, commissioned and undergo

maintenance according to the current “state-of-the-art”.

This also holds for the hydraulic system, the flue exhaust

system and the installation room.

Installation instructions

x = not less than the length of the boiler body

(dimensions in mm); in any case, never less than 1300 mm.

xx = see instructions to the side.

3.4 - POSITIONING IN

BOILER ROOM

The boiler must be installed in compliance with standards and

prescriptions in force.

The room must be well ventilated by openings with a total surface

no less than 1/30 the surface of the boiler room, with a minimum

of 0.5 m².

The ventilation openings must be permanent, communicate

directly with the outside and be positioned high or low according

to standards in force.

The location of the ventilation openings, the fuel supply circuits,

electric energy supply and lighting must comply with current

legal provisions in relation to the type of fuel used.

It is recommended to install the boiler as close to the chimney

connection as possible.

To make it easier to clean the smoke circuit, in front of the boiler,

there must be a free space no less than the length of the boiler

body and, in any case, never less than 1300 mm. Check that

with the door opened 90°, the distance between the door and

the adjacent wall is at least the length of the burner.

The boiler can be placed directly on the floor as it is equipped

with a base.

However it is useful to provide a flat, level cement plinth capable

of bearing the weight of the boiler full of water.

When positioned on the plinth, the dimensions must be at least

Q x R (see dimensions table).

When installation has been performed, the boiler must be

perfectly horizontal and stable (to reduce vibrations and noise).

fig. 16

3.3 - HANDLING

The boiler can be handled easily, lifting it by means

of upper hook/s or shifting it on rollers underneath

the sturdy base longerons.

3.5 - BURNER

The burners operating with the TRISTAR 3G 2S boilers must

have the EC certification and comply with:

- Gas appliance directive (90/396/EEC).

- EMC Directive - Electromagnetic Compatibility (89/336/

EEC).

They must also be approved according to the specifications:

- UNI EN 676 - air-blown burners for gaseous fuel.

- Efficiency Directive (92/42 EEC).

3.5.1 - CHOOSING THE BURNER

The correct choice and adjustment of the burner are fundamental

for optimal operation of the boiler and therefore must be done

carefully and not underestimated.

The burner must be chosen verifying that its firing rate (fuel

capacity - combustion chamber pressure) is compatible with

the same features declared for the boiler.

Remember that pressure drops on the flue side of the boiler,

namely combustion chamber backpressure, refer to zero pressure

at the base of the chimney.

It is also recommended that the burner blast tube be no shorter

than the minimum dimension shown in the following table and

that the flame which must be implemented be suitable for the

characteristics of the combustion chamber.

In order to take advantage of the whole heat exchange surface

of the blind bottom furnaces, use burners capable of providing

a “long and narrow” flame in any operating condition, namely

even at the minimum output when controlling two or more stages

or modulating.

Flames which are too short cause overheating in the front of

the furnace and combustion products, not sufficiently cooled,

entering the smoke pipes at too high temperatures can seriously

damage the generator.

The manufacturing companies of the burners can supply the

dimensions of the flames which their appliances develop,

If necessary for clearance purposes, the door and the smoke

chamber can be removed to make it easier to enter the boiler

room.

Installation instructions

especially those approved based on the standards indicated

above.

Further information is provided in the chapter “Commissioning”.

BOILER TYPE

øA

fig. 17

TST 3G 840 2S

TST 3G 500 ÷ 730 2S

TST 3G 300 - 380 2S

TST 3G 185 - 225 2S

TST 3G 110 - 150 2S

TST 3G 65 - 85 2S

DIMENSIONS OF BURNER BLAST TUBE

TST 3G 1100 - 1320 2S

TST 3G 1600 - 1900 2S

3.6 - CONNECTING FLAME SIGHT GLASS

TO BURNER

The flame sight glass is provided with a 1/8" threaded connection

(pos. 1) upon which a 9 mm pressure test nipple is mounted.

It can be used with a silicon tube to measure the backpressure

in the combustion chamber.

In place of this test nipple, which must be kept, an appropriate

fitting will be mounted to connect the flame sight glass

directly to the pressure chamber downstream the burner fan

by means of a copper tube (pos.2).

The air blown by the fan will conveniently cool the sight glass

and keep it from blackening.

If the cooling tube is not connected to the sight glass, it could

break.

ATTENTION: the flame sight glass can be very

hot; therefore pay the utmost attention.

fig. 18

3.5.2 - INSTALLING THE BURNER

Before assembling the burner, check the

position of the turbulators inside the tubes:

each tube must be provided with its own

turbulator and this must be positioned as

shown in the figure on page 8.

The burner must be mounted to the door of the boiler guaranteeing

perfect sealing of the combustion products.

The burner is supplied with a piece of ceramic fiber cord

which must be placed on the blast tube of the burner to

fully seal the space between the blast tube and the slot in

the door.

Make sure that no gaps remain between the blast tube and the

slot on the refractory material inside the door.

Should a cone larger than the diameter of the blast tube be

mounted, it must be removed before mounting the burner on

the support plate and put back afterwards.

With the burner mounted, check that the electric cables are

long enough to allow the door to open 90°.

For gas-fired burners, flexible hoses cannot be used for

connections. Therefore it must be possible to disconnect the

final section of the gas adduction tube by means of a threaded

or flanged joint.

270 280

220 230

180 200

180 180

132 180

270 320

285 350

Installation instructions

3.7 - FURNACE DOOR: ADJUSTMENT,

OPENING AND CLOSING

IMPORTANT

- The door of the boiler must be opened when it is cooled

off to avoid damaging the fibre due to thermal shock.

- The insulation fibre of the door can show cracks after

a short time of operation; this however does not reduce

its insulation capacity nor jeopardise its lifespan.

3.7.1 - “TST 3G 65 - 85 2S” BOILERS

For all these models, the door is hinged and

fixed according to the layout in fig. 19.

In these cases, the door is mounted with four

equal hinges: the two on the left side, with the pin

inserted, are normally used as rotation hinges

(from right to left), while the two on the right side

are used as closing hinges; the door is then

secured with 4 screws.

It will be exactly the opposite when the door is

opened from the left to the right.

To invert rotation, just move the pins to the

opposite side.

The following adjustments can be made on the door of these

boiler models:

A) Vertical adjustment: only by inserting suitably thick washers

below the hinge which the door turns on.

B) Crosswise rotation: loosening the hinges fixed on the front

plate of the boiler and moving them sideways.

C) Axial rotation: screwing different tightening screws.

fig. 19

- The door fibre is easy to replace and is covered by a

two-year warranty.

3.7.2 - “TST 3G 110 ÷ 380 2S” BOILERS

For all these models, the door is hinged and fixed

according to the layout in fig. 20.

In these cases, the two hinges on the left are normally

sed as rotation hinges (from right to left), while the two

on the right side are used as closing hinges.

It will be exactly the opposite when the door is

opened from the left to the right.

To invert rotation, just move the rear locknuts to the

opposite side.

The following adjustments can be made on the door of

these boiler models:

A)Vertical adjustment: only by inserting suitably

thick washers below the hinge which the door turns on.

B)Crosswise rotation: loosening the hinges fixed on the

front plate of the boiler and moving them sideways.

C)Axial rotation: screwing different tightening screws.

fig. 20

Installation instructions

3.7.4 - “TST 3G 840 ÷ 1900 2S” BOILERS

For all these models, the door is hinged and fixed according to

the layout in fig. 22.

In these cases, the two hinges on the left are normally used as

rotation hinges (from right to left), while the two on the right

are used as closing hinges.

It will be exactly the opposite when the door is opened

from the left to the right.

To invert rotation, just move the rear locknuts to the opposite

side.

The following adjustments can be made on the door of these

boiler models:

A) Vertical adjustment:by acting on the nut of the upper hinge

pin which the door turns on.

B) Crosswise rotation: loosening the hinges fixed on the front

plate of the boiler and moving them sideways.

C) Axial rotation: screwing different tightening nuts.

fig. 22

3.7.3 - “TST 3G 500 ÷ 730 2S” BOILERS

For all these models, the door is hinged and fixed according to

the layout in fig. 21.

In these cases, the two hinges on the left are normally used

as rotation hinges (from right to left), while the two on the right

side are used as closing hinges.

It will be exactly the opposite when the door is opened from

the left to the right.

To invert rotation, just move the rear locknuts to the opposite side.

The following adjustments can be made on the door of these

boiler models:

A) Vertical adjustment: only by inserting suitably thick washers

below the hinge which the door turns on.

B) Crosswise rotation: loosening the hinges fixed on the front

plate of the boiler and moving them sideways.

C) Axial rotation: screwing different tightening nuts.

fig. 21

3.7.5 - IMPORTANT NOTE

Before opening the door of the furnace, take the following safety

measures:

- Close the fuel supply (diesel oil or gas) to the burner.

- Cool the boiler off by having water circulate and then

disconnect electrical power.

- Place a sign on the boiler with the following text: DO NOT

USE, BOILER MAINTENANCE UNDERWAY, OUT OF

SERVICE.

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Unical TRISTAR 3G Installation guide

Unical TRISTAR 3G Installation guide

Unical TRISTAR 3G Installation guide

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