Boschetti Industrie Meccaniche BGMTBAX 300 Reference manual

Manual for installation and use
FOR USER AND INSTALLER
STORAGE GAS WATER HEATER
STAND ON COMMERCIAL Low Nox
IT - Cat. I2H
Prod. ID - Nr. –0085CT0381
BGMBAX 300

Boschetti Industrie Meccaniche srl 2 IT Ver. 01/2018
Index
Index ................................................................... 2
General warnings ................................................ 3
Technical data ..................................................... 3
Injectors scheme ................................................. 4
Installation .......................................................... 5
Gas connection.................................................... 6
Hydraulic connection........................................... 7
Thermo connection (only for versions with this
option) ................................................................ 8
Exhaust connection ............................................. 9
Check list before ignition ................................... 10
Injectors’ check................................................. 10
Tank filling ........................................................ 10
Control pressure inlet gas (Pn) ......................... 10
Control pressure outlet gas (Injectors pressure) ...... 10
Rated thermal capacity check........................... 11
Flame check ...................................................... 11
Control evacuation of combustion gases and the
smoke detector................................................. 11
Delivery to the user ........................................... 12
Instructions for use............................................ 13
General warnings.............................................. 13
Water tank filling .............................................. 13
Burner’s ignition ............................................... 14
Temperature setting..........................................14
Off burner..........................................................14
Cleaning and care ..............................................15
Water tank’s drain.............................................15
Precautionary measures to be followed in case of
a long prolonged inactivity of the device or in
case of frost.......................................................15
Precautionary measures in case of device‘s
troubles .............................................................15
Maintenance ..................................................... 16
Cleaning of the evacuation system of combustion
gases..................................................................16
Cleaning the air intake of the appliance ............16
Smokes sensor replacement .............................16
Safety gas valve replacement ............................16
Piezoelectric ignitor replacement......................16
Routine control of the magnesium anode.........16
Thermocouple and pilot burner replacement ...17
Burners injectors replacement ..........................18
Pilot’s injector replacement ..............................19
Spare parts list...................................................21
Data sheets for energy class .............................. 22
Warranty certificate ..................................... 23
Contacts ............................................................ 24

Boschetti Industrie Meccaniche srl 3 IT Ver. 01/2018
General warnings
Before install, use and technical intervention of the device, read carefully this manual which is an integral and essential
part of the product.
Installation and maintenance must be carried out by a qualified staff, according to constructor ’s directions and the rules
in force. In particularly the maintenance must be carried out by a qualified technical staff authorized by the constructor
or the appointed retailer.
Boschetti Industrie Meccaniche srl does not answer for damages on objects, person and/or animals caused by a wrong
installation or a non respect of this manual’s directions. Any improper intervention caused the decline of the warranty.
The water heater must be designed to the use it has been built for. The constructor decline any responsibility for
different use since wrong and dangerous.
Technical data
The essential technical information, like wattage rating evacuation’s, consumptions, predisposition to gas type, gas
pressure inlet, water pressure inlet is summarized on the plate serial number placed on the frontal side of the devices
on the left over the drive handle.
Dimensions
Capacity
Connections
Model
Weight
kg
Height
mm
Diam.
mm
Litres
Gas
EN10226-1
EN ISO 228-1
(DK)
Smokes
evacuation
ø mm
Sanitary water
EN10226-1
Heating system
EN10226-1
Enter
Exit
Enter
Exit
Storage gas water heater stand on commercial Low Nox
BGMBAX 300
142
1679
650
293
Rp 1/2
120
R 1
R 1
Storage gas water heater stand on commercial Low Nox - Thermo version
BGMTBAX 300
162
1679
650
293
Rp 1/2
120
R 1
R 1
Rp 1
Rp 1

Boschetti Industrie Meccaniche srl 4 IT Ver. 01/2018
Injectors scheme
Models
Cat.
(IT) I2H
BGMBAX 300
BGMTBAX 300
Burner
atmospheric
Wattage rating
17,5 kW
Type
B11BS
Consumption:
Natural Gas H: G20 (Hi 9,45 kWh/m³) m³/h
1,80
Injectors
in 1/100 mm
Natural Gas H
Pilot
29.2
Burner
250
Pressure injector
(mbar)
11,5
Exhaust gases volumetric mass
15,0 g/s
Exhaust gases temperature
115 °C
Depression in flue pipe
1,9 Pa
Water inlet maximum pressure for water in
net
600 kPa

Boschetti Industrie Meccaniche srl 5 IT Ver. 01/2018
Installation
Only a professional qualified technician is authorized to install the gas devices.
The installation must be carried out in conformity of:
- the current laws prescription;
- the laws in force about gas domestic installation;
- the direction for exhaust gases;
- the national and municipal laws.
Before installing the device check if it received in proper condition; in case of defects please contact the supplier.
The packaging must be kept away from children as they may be very dangerous. These parts have to be disposed
according to the local laws.
The place for the installation must respect all the condition listed in the laws in force about gas plants for domestic use
supplied by a distributing net - Projecting, installation and maintenance. A correct aeration must be guaranteed through
permanent right-dimensioned hole.
Water heater with base must mantein a distance of at least 50 mm from the adjoining walls (see pic. 1).
The floor on which the water heater will be put must be of a non flammable stuff, otherwise it must be isolated in an
adequate way. Place the water heater parallel to the floor with the aid of a level tool.
Picture 1
Distance from walls = 50 mm (A)
A
A

Boschetti Industrie Meccaniche srl 6 IT Ver. 01/2018
Gas connection
The inlet gas pipe may be flexible or rigid and must have a diameter of R 1/2 or even more.
In case of flexible pipes it must be an homologated product approved by local norm.
Between the device and the supply gas network must be installed a proper homologated valve as settle in the current
laws.
Before connection you have to check if the gas available in the place corresponds to the type fixed in the device (see plat
serial number).
Before switch on the device check if the connection is properly tightened. To check the eventual leakages use of any
kind of flame is strictly forbidden.
Picture 2
Entry gas Rp 1/2 on the valve
Picture 3
Entry gas Rp 1/2 on the valve
Gas entry Rp 1/2

Boschetti Industrie Meccaniche srl 7 IT Ver. 01/2018
Hydraulic connection
Before installing the water heater, check the pressure of the inlet water pipe, (see the proper values reported in the
schemes pag.3-4). If the pressure is higher than the highest value, we suggest the interposition of a pressure reducer
valve between the water heater of the inlet pipe which has to be placed as far as possible from the device. The ideal
position is near the meter.
The overpressure valve provided with the heater must be screwed on the entry hitch of cold water heater. Avoid any
tampering as the valve is set in the factory according to the characteristic functions of the water heater (intervention in
the stages of water temperature’s variation). In the heating stage a light leakage of the valve is normal; for this reasons
we suggest the connection of the valve with a drain. If the dripping persists:
1) check or install a pressure reducer as far as possible from the water heater (near the meter);
2) install in the sanitary circuit an expansion tank for alimentary use, whose capacity have to be at least a 10% of the
total one of the product.
The connection for water exit is placed on the opposite side of cold water entry. The water connection must be carried
out with pipes a suitable for drinking water conduction.
Note: use a proper overpressure valve connection system. Follow the correct direction, fixed by regulations in force and
with any possibles rules of the local authority responsible for water supply.
Note: The water drain from the overpressure valve may take place even without notice. Therefore we advise to connect
the valve with a drain.
Note: If the water is particulary hard and in the system there is a water softener, it is compulsory to the warrenty: 1) To
check that the hardness values aren’t lower than 22° F and higher than 28° F. 2) Install a polyphosphates doser.
Treatments have to be in keeping with UN CTI 8065 regulations. Please contact a qualified company to this aim.
Note: Only valid for countries which have enacted EN 1487: Between the appliance and the hydraulic network the
installer must install a hydraulic safety unit in conformity with EN 1487, not supplied with the appliance.
IMPORTANT: The overpressure safety device supplied with the water heater is an overpressure valve, not a hydraulic
safety unit.
Picture 4
A - Warm water exit
B - Cold water entry
C - Overpressure valve
D - Valve drain
C
A
B
D

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Thermo return
Thermo flow
Thermo connection (only for versions with this option)
Only for this model: BGMTBAX 300.
The Termo version water heaters are equipped with a fixed double-walled heat exchanger and can be powered by
alternative thermal sources through the connection to the domestic heating system or other alternative energy
production system. For this purpose, thermo flow and thermo return have to be connected (see following draw).
Connection’s dimensions (see technical data scheme) must be strictly respected.
Maximum operating pressure of the heating fluid Thermo: 3 bar.
Picture 5
Connection to the domestic heating system or other
alternative energy production system.

Boschetti Industrie Meccaniche srl 9 IT Ver. 01/2018
Exhaust connection
The device belongs to B11BS, therefore the exhaust gases must be evacuated outside with the interposition of a
draftdamper and smokes sensor. The first thing to do is to mount the draftdamper; screw the screws in the suitable
holes on the upper cover of the water heater.
Afterwards, connect the fastons which are fixed on cables’ limbs on the tongues of the sensor placed on draftdamper’s
backside. The cross connection to the fire-tube must have a diameter according to the technical data schemes.
The laws in force on the matter must be followed.
The smokes sensor is a thermostat with a fixed setting. If the draftdamper overheats the smokes sensor opens the
contacts by interrupting the themocouple’s circuit and in this way it closes the gas flux to the valve.
The smokes sensor is an obligatory security which stops the water heater in case of bad draft. The burner turn off to
avoids that the exhaust gases propagate outside and provoke even deadly damages on person.
Picture 6
Draftdamper and burnt gas evacuation pipe’s assembling
Smokes sensor connection
Connecting pipe to the chimney
Draftdamper’s positioning
Faston-smokes
sensor connection
Fixing screws

Boschetti Industrie Meccaniche srl 10 IT Ver. 01/2018
Check list before ignition
After the installation, which has to be carried out by an authorized technician in order with the rules in force, and before
burner’s lighting which has to be carried out by a qualified technician, you have to do the following check:
Injectors’ check
First of all you have to compare the data on the plat serial number and on the supplementary one about device category
and predisposition to gas type with the characteristic data of the local gas (gas type and pressure). The device must be
turned on according to the thermal capacity forseen for prescribed injectors.
Tank filling
To do these check operations it is necessary to fill the water tank. To fill it with the net water you have to:
- open the cold water discharge cock;
- open the warm water exit cock.
We suggest to open a warm water tap of the domestic system so that air in pipe evacuates.
The necessary time for the filling is strictly connected with tank’s capacity.
Control pressure inlet gas (Pn)
This check must be carried out with an U-shaped pressure meter (lowest resolution 0,1 mbar). The pressure meter must
be connected with the pressure tap indicate in picture 7.
Turn on the device by following the instructions for use, and after some minutes check the pressure. The pression must
have the following values:
IT - I2H - 20 mbar
for natural gas: entry gas pressure (Pn) 20 mbar; if it’s lower than (Pmin) 17 mbar or higher than (Pmax) 25 mbar, turn
off completely the device and contact the gas distribution company to solve the problem.
Control pressure outlet gas (Injectors pressure)
This check must be carried out with an U-shaped pressure meter (lowest resolution 0,1 mbar). The pressure meter must
be connected with the pressure tap indicate in picture 8.
Measure the injectors pressure through the pressure tap (Exit) and if it's necessary set the injectors pressure using the
adjustment screw shown in picture 9. The injectors pressure must be corresponds to the value indicated in the table of
technical data (See table page 4).
Picture 7
Pressure tap (Entry)
Pressure tap (Entry)

Boschetti Industrie Meccaniche srl 11 IT Ver. 01/2018
Rated thermal capacity check
After have checked the proper injectors installation and the inlet gas pressure, check the thermal capacity. With the
volumetric method with a chronmeter and a gas counter. The check consist in calculating the consumption in a
determinate time unit. The result must be compared with technical data schemes. (See table page 4).
Flame check
You can check both the main burner’s flame and the pilot burner‘s flame with a sight examination through the peephole
located at the entrance side of the burner as indicated in picture 10. Their aspect must be a steady flame and not return
to ignition.
Note: the water heater is not provided with primary air setting.
Control evacuation of combustion gases and the smoke detector
To check the right working of the smokes sensor switch off the burn gas circuit. The simulation must be carried out by
inserting a pipe 50 cm long of a suitable diameter which must be plugged with a sheet metal.
The burner and the pilot must go out in two minutes from the moment in which the pipe has been plugged.
If this does not happen check again the connection of the fastons. It may be also necessary to change the piece.
Picture 10
Peephole for control of the flames
Picture 8
Pressure tap (Exit)
Pressure tap
(Exit)
3
4
it
5
P.R.ADJ.
-
LPG
No PR.
E
Picture 9
Injectors pressure adjustment screw

Boschetti Industrie Meccaniche srl 12 IT Ver. 01/2018
Delivery to the user
The product is ready to be used only when all the operations describes in the manual have been carried out and
checked.
Explanation to the user how the device work both for security and economicity is compoulsary with the help of this
manual.
Remember to the user that variations of the installation place can influence the combustion air’s contribution. Therefore
when changes are carried out it is necessary to call the qualified technician to check the working.
It is advisable to suggest the user a maintenance contract, as gas devices must be checked annualy.
It is strictly forbidden to give to the user a water heater with working defects.

Boschetti Industrie Meccaniche srl 13 IT Ver. 01/2018
Instructions for use
General warnings
Both for the maintenance and the reparation charge qualified and authorized technicians. The installation as well as
possible transformations into another gas type, maintenance and reparations must be carried out according to the
directions in force and only by a qualified and authorized staff. Otherwise the warranty and the responsability of the
constructor are no longer valid.
The device must be checked at least once a year by a qualified staff. About this a maintenance contract as advisable.
The water heater is thought to heat drinking and sanitary water, any different use is not allowed.
Children must be kept away from gas devices.
Before turning on the device read carefully all the directions reported on this manual.
Do not let the device come into contact with inflammable material.
Water tank filling
Before carrying out this operation, it is recommended to carry out the hydraulic connection in according to the
instructions at the specific paragraph on page 7.
The water tank filling must be carried out as follows:
- open the cold water tap (pic. 11 - pos. B);
- open the warm water tap (pic. 11 - pos. A).
It is advisable to open a warm water tap of the domestic plant so that the air in the pipe evacuates. The necessary time
for tank filling depends on the device‘s rated capacity.
Picture 11
A - Warm water connection
B - Cold water connection
C - Discharge
D - Control panel
E - Recirculation
A
B
C
D
E

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Burner’s ignition
First of all open the gas shutoff cock uphill.
Push the button (pic. 12 - pos. A) and turn it contemporaneously anticlockwise untill the position (spark) is reached.
Push the button (pic. 12 - pos. A) and start more than once the piezoelectric ignitor (pic. 12 - pos. B) untill the pilot
burner lights up.
Keep the button pushed (pic. 12 - pos. A) for 10-20 seconds, than let it and check if the burner has lighted up.
When the burner is alight, push the button again and turn it anticlockwise untill to the position corresponding with the
symbol “ I”. On release, the button returns to the position (flame ).
Note: If the burner does not light up, repeat the operation again; a new attempt can carried out only after 2-3 minutes.
Temperature setting
Set the thermostat as you please (pic. 12 - pos. T). For this purpose consult the following scheme:
Note: For an economic working and a long endurance of the device, it is advisable to keep the thermostat on the
position 4.
Note: The temperatures indicated in the table are approximate. There may be margins on the indicated temperature of
± 7 °C.
Off burner
Turn the thermostat to position 1 (pic. 12 - pos. T). Push the button (pic. 12 - pos. A) and contemporaneously turn it
untill the position (full disk) is reached. Close the gas shoutoff cock uphill.
Position
1
2
3
4
5
°C
40
45
55
60
70
Picture 12
Control panel
A - Button mode
B - Piezoelectric ignitor
T - Setting knob
A
B
T

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Cleaning and care
The device does not need special attention for cleaning and care. The external surfaces can be cleaned with a damp
cloth, if necessary with some detergents, then they have to be dry up. Do not use scratching, abrasive or corrosive
products, as the surfaces could be damaged. Do not wash the water heater with direct or under pressure water jets.
Water tank’s drain
To drain the water tank close the tap of cold water entry, and then open the appropriate tap knob for the drain (see
pag.13 Pic. 11 - pos. C) and proceed until the tank is emptied.
Precautionary measures to be followed in case of a long prolonged inactivity of the device or in case of
frost
After long inactivity period of the device, especially in cold places with under 0 temperature freezes, it is better to
discharge the device.
The discharge procedure must be carried out as explained above. The cold water feed and the gas feed must be closed
carefully.
Precautionary measures in case of device‘s troubles
When there are working troubles, turn off the storage water heater, close all water and gas connections and call the
clients assistance center or qualified technicians.
-The most common trouble is on the smokes sensor. If the device does not work because of this part, turn on
the device again. In case of no resalt call a technician.
-The pilot burner lights up but the main burner does not: only in this case the injector may be obstructed. Call
a technician to carry out a proper maintenance.
Other faulty lightings may be provoked by a pressure oscillation in the feeder system or a gas lack in network.
It is strictly forbidden to turn on the device without have followed these safety directions.
Important note: always warn the assistance service.

Boschetti Industrie Meccaniche srl 16 IT Ver. 01/2018
Maintenance
It is advisable to carry out at least once a year by a qualified staff a check on the working of devices, the combustion, the
lighting and device‘s safety.
If it is necessary to replace an accessory or device, it is advisable to request the spare part from the manufacturer (see
the exploded drawing with the spare part list at pag.20).
Before starting any work it is necessary to disconnect the device from the gas network.
Cleaning of the evacuation system of combustion
gases
It is recommended to check at least once a year the
cleaning and the regular draft of the smoke evacuation
system. If the draft is insufficient, the smokes enter in the
environment through the intake openings and cause the
production of carbon monoxide, very dangerous for
health. It can also cause a rise in temperature inside the
combustion chamber which can cause damage to the
product. This operation must be carried out by a qualified
staff. You have to follows these directions:
- remove the cover for gas valve and unscrew the related
fixing screws;
- dismount the burners protection mask;
- loosen in sequence: the termocouple, the valve-pilot's
gas tube and the valve-burner's gas tube;
- Unscrew the fixing screws and remove the support box
with burners and pilot;
- take away the draftdamper;
- clean the smokes system;
- remount the same parts and check the tightness and the
working performance.
Cleaning the air intake of the appliance
It is recommended to check at least once a year the
cleaning and the regular aeration of the air intake that
communicates with the outside. If the air inside the room
is insufficient, it does not guarantee the correct
recirculation of air for the combustion of the appliance
and cause the production of carbon monoxide, very
dangerous for health. It can also cause a rise in
temperature inside the combustion chamber which can
cause damage to the product. This operation must be
carried out by a qualified staff. You have to follows these
directions:
- dismount the burners protection mask and remove any
solid bodies and various obstructions (for example leaves
or dust);
- remount the burners protection mask and check the
tightness and the working performance.
Smokes sensor replacement
The smokes sensor replacement can be carried out only
by a qualified staff. You have to follows these directions:
- take out the cables connected with the fastons;
- loose the screws which fix the smokes sensor to the
antiwind;
- mount the screws on the new piece;
- fix the screws.
To carry out the check of smokes sensor, see the
correspondent paragraph.
Safety gas valve replacement
The replacement of a defected gas valve must be carried
out only by a qualified staff. You have to follows these
directions:
- Remove the cover for gas valve and unscrew the related
fixing screws;
- loose the gas connection (pilot burner and main burner);
- take out the smokes sensor‘s cable;
- empty the water tank;
- remove the safety gas valve and replace it with a new
one;
- set all the parts and the connections by following the
inverse procedure and connect them respectively.
Piezoelectric ignitor replacement
The replacement of a piezoelectric ignitor must be carried
out only by a qualified staff. You have to follows these
directions:
- remove the cover for gas valve and unscrew the related
fixing screws;
- remove the piezoelectric ignitor and replace it with a
new one;
- Remount the cover for gas valve and fix the related
screws.
Routine control of the magnesium anode
It is compulsory to the warranty the routine control and
the possible sobstitution of the magnesium anode,
operation that have to be executed by a qualified
assistance centre. Every check have to be registred in the
present user’s manual.
If after 12 months the magnesium anode is completely
worn, this means that the water you use is strongly
corrosive and may damage the tank in a short time. It
this case the warranty declines.

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Thermocouple and pilot burner replacement
This operation must be carried out only by a qualified staff. You have to follows these directions:
- remove the cover for gas valve and unscrew the related fixing screws;
- dismount the burners protection mask;
- loosen in sequence: the thermocouple, the valve-pilot's gas tube and the valve-burner's gas tube;
- Unscrew the fixing screws and remove the support box with burners and pilot;
- remove the thermocouple or the pilot burner and replace the part;
- set all the parts by following the opposite procedure.
Picture 13
Disassembly the cover for gas valve and access to the burners and pilot group
Cover for
gas valve
Burners protection mask
Support box for burners
and pilot group
Valve-pilot's
gas tube
Valve-burners gas
tube
Thermocouple

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Burner’s injector
Burners injectors replacement
This operation must be carried out only by a qualified staff. You have to follows these directions:
- remove the cover for gas valve and unscrew the related fixing screws;
- dismount the burners protection mask;
- loosen in sequence: the thermocouple, the valve-pilot's gas tube and the valve-burner's gas tube;
- Unscrew the fixing screws and remove the support box with burners and pilot;
- remove the locknuts;
- dissamble with a suitable key the injectors of the burners and replace them with the right ones fixing the connections;
- set all the parts by following the opposite procedure.
- set the pressure to the injectors according to technical data scheme at page 4. (see paragraph at pag. 10 “Control
pressure outlet gas (Injectors pressure)”).
Picture 14
Burners injectors replacement
Locknut
Burner’s injector
Locknut
Two burners
Valve-burner's
gas tube

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Pilot’s injector replacement
This operation must be carried out only by a qualified staff. You have to follows these directions:
- remove the cover for gas valve and unscrew the related fixing screws;
- dismount the burners protection mask;
- loosen in sequence: the thermocouple, the valve-pilot's gas tube and the valve-burner's gas tube;
- Unscrew the fixing screws and remove the support box with burners and pilot;
- remove the pilot with relative support structure by unscrewing the fixing screw;
- loose the fitting of the valve-pilot's gas tube;
- take away the injector by slipping off the valve-pilot's gas tube;
- set the new injector in the pilot burner and fix correctly the connection;
- set all the parts by following the opposite procedure.
Thermocouple
Picture 15
Pilot’s injector replacement
Fitting
Pilot’s injector
Pilot
Support structure
for pilot

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Picture 16
Exploded drawing
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 16
17
18
19
20
21
22
23
24
25
26
27
28