12
1.14
High performance cast iron elements
3th pass
(smoke channels)
2nd pass
1st pass
The 3-passage system brings about the forced circulation of the
combustion gas inside the boiler three times before it comes out
of the discharge pipe. In this way, all the useful thermal energy
is transferred to the water inside the elements. The optimised
combustion chamber and the excellent thermal insulation pro-
vide maximum energy efficiency.
The combustion chamber of the boiler has a positive pressure.
The boiler operates according to the principle of 3 horizontal
passages.
1.15
Ventilation of the boiler room
The constant ventilation of the boiler room is important for three
reasons:
1
Air is required for the boiler's combustion process.
2 Air is required to prevent the formation of dirt and dust and
for the emission of the gases and the depletion of the fuel.
3 Air is required to prevent the boiler room overheating.
Ventilation for the first two reasons is constantly required. In the
third case, ventilation is needed above all for boilers that also
operate in summer.
The maximum temperature of the boiler room should be 32 °C
and the room should be protected from frost.
Type of boiler Combustion gas pipe
dimensions (mm)
Flue gases
pipe
(methane gas) (m)
RTT 378
350
11.41
16.43
RTT 448
350
16.01
23.06
RTT 506
350
20.44
29.44
RTT 564
350
25.41
36.59
RTT 610
350
29.78
42.88
RTT 663
350
35.1
50.54
RTT 715
350
40.86
58.84
RTT 773
350
47.77
68.79
RTT 831
350
55.23
79.53
RTT 878
350
61.58
88.68
1.13
Control panels that can be combined
The control panels that can be combined with the RTT boilers are
those shown below, which take into account the various oper-
ating functions, the requirements of the heating system and the
various devices used on it.
TECH PRIME
only for heating (1 direct zone) with one-stage or two
stage burner.
TECH PRIME ACS
only for heating (1 direct zone) and domestic hot
water production with one-stage or two stage burner.
9
When the TECH PRIME control panel is installed, on the boiler
return line (cold water), there needs to be a well for housing
the probe. For the accessories codes, see the price list.
9
The boilers in the RTT range have a maximum operating
temperature of 110°C.
9
Before placing the electrical panel on the top panel it is nec-
essary to fit the relative shim supplied with the boiler. For
more details, see the assembly manual.