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If the fuel is methane gas:
(*) Cross-section of the
Type of
opening for natural ven-
boiler
tilation (cm²)
(***)
Lower part
RTT 163
1,003
RTT 195
1146
RTT 227
1290
RTT 259
1,434
RTT 291
1,578
RTT 323
1722
RTT 355
1,866
(*) 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.
Output
Type of
boiler
kCal/h
kW
RTT 163 140,000 162.8
RTT 195 167,500 194.8
RTT 227 195,000 226.7
RTT 259 222,500 258.7
RTT 291 250,000 290.7
RTT 323 277,500
322.7
RTT 355 305,000 354.7
(*) ∆t = temperature difference
NOTA: The RTT boiler has been designed only for heating systems
with forced circulation of hot water.
(**) Volume of air
required for forced
ventilation
Upper
Lower
Upper
part
part
501
527
573
631
645
735
717
838
789
942
861
1,045
933
1,149
∆ t = 15 K (*)
∆ t = 20 K (*)
Water
Water
Water
flow
resist-
flow
rate
ance
rate
m
/h
mbar
m
/h
3
3
9.3
37.0
7.0
11.2
27.0
8.4
13.0
29.0
9.8
14.8
38.0
11.1
16.7
45.0
12.5
18.5
71.0
13.9
20.3
82.0
15.3
1.16 Gas side resistor and output temperature of
combustion gases
3,00
part
2,60
352
2,20
421
1,80
490
1,40
559
628
0,80
697
766
0,20
20
220
200
180
160
Water
resist-
130
ance
mbar
100
15.0
10
17.5
23.0
25.0
26.0
1.17 User instructions
31.0
Heating system
41.0
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.
13
30
50
70
90
110
40
60
80
100
Heat output (kW)
20
30
40
50
60
Load (%)
Full load
Part Load
130
150
120
140
160
70
80
90
100
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