13
If the fuel is methane gas:
Type of
boiler
(*) Cross-section of the
opening for natural ven-
tilation (cm²)
(**) Volume of air
required for forced
ventilation
(***)
Lower part
Upper
part
Lower
part
Upper
part
RTT 163
1,003
501
527
352
RTT 195
1146
573
631
421
RTT 227
1290
645
735
490
RTT 259
1,434
717
838
559
RTT 291
1,578
789
942
628
RTT 323
1722
861
1,045
697
RTT 355
1,866
933
1,149
766
(*) if natural ventilation is used.
(**) if forced ventilation is used.
(***) The value in the “Lower” column refers to the clean air in-
put, the one in the “Upper” column to the air output.
To ensure the boiler is operating at optimal conditions, the tem-
perature difference between the supply water and the return
water should be no greater than 20 °C. The boiler should not be
started or run with water volumes lower than those indicated in
the following table.
Type of
boiler
Output
∆
t = 15 K (*)
∆
t = 20 K (*)
kCal/h
kW
Water
flow
rate
Water
resist-
ance
Water
flow
rate
Water
resist-
ance
m
3
/h
mbar
m
3
/h
mbar
RTT 163 140,000 162.8
9.3
37.0
7.0
15.0
RTT 195 167,500 194.8
11.2
27.0
8.4
17.5
RTT 227 195,000 226.7
13.0
29.0
9.8
23.0
RTT 259 222,500 258.7
14.8
38.0
11.1
25.0
RTT 291 250,000 290.7
16.7
45.0
12.5
26.0
RTT 323 277,500 322.7
18.5
71.0
13.9
31.0
RTT 355 305,000 354.7
20.3
82.0
15.3
41.0
(*)
∆
t = temperature difference
NOTA:
The RTT boiler has been designed only for heating systems
with forced circulation of hot water.
1.16
Gas side resistor and output temperature of
combustion gases
0,20
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
0,80
1,40
1,80
2,20
2,60
3,00
Full load
Part Load
Heat output (kW)
Gas side resistance (mbar
)
100
130
180
200
220
160
10
20
30
40
50
60
70
80
90
100
Exit flue gas temperature (°C)
Load (%)
1.17
User instructions
Heating system
In the heating system, the difference between the direct supply
temperature and the water return temperature should not ex-
ceed 20°C. The temperature of the return water should higher
than 50°C. Use the boiler's protection pump to increase the tem-
perature of the return line water. Regularly measure the system's
water level and add water if it is too low. Before adding water to
the system, stop the pump and wait for the water temperature
to reach 40°. Check for and resolve any problems caused by leaks
in the boiler or in the system.
The hydraulic system should be carried out by qualified person-
nel to meet European standards.
For the system use material complying with European stand-
ards.
Connections to the electrical system and fuel delivery system
All the electrical connections should only be carried out by qual-
ified professional using only materials and assembly procedures
that comply with regulations in force in the country where it is
used. For the burner, the control panel, Ecopanel etc.,. read the
directions and warnings carefully in the instruction manuals
supplied by the manufacturer or distributors. Do not switch on
the burner until the circulation has started inside the boiler. If
the circulation pump or the protection pump are faulty, switch
off the burner. The system should work in a coordinated man-
ner.
The circulation pump should always be operating when the
burner is running. Choose a protection pump that is adequate
for the boiler output. Connect the pump to the collectors, to the
valve and to the thermostat correctly. In this way the system
can switch off once the pre-set temperature has been reached.
