16
Technical features and dimensions
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 accor-
ding to standards in force.
The location of the ventilation openings, the fuel supply circui-
ts, 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 capa-
ble of bearing the weight of the boiler full of water.
When positioned on the plinth, the dimensions must be at
least
R
x
S
(see dimensions table).
When installation has been performed, the boiler must be
perfectly horizontal and stable (to reduce vibrations and noi-
se).
fig. 14
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 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 funda-
mental 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 pres-
sure at the base of the chimney.
It is also recommended that the burner blast tube be no shor-
ter 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 surfa-
ce of the blind bottom furnaces, use burners capable of pro-
viding 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 se-
riously damage the generator.
If necessary for clearance purposes, the door and the smoke
chamber can be removed to make it easier to enter the boiler
room.
