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3 Technical description
3.1 General description
The boilers of the NXR3i range are pressurised hot water boilers
designed for connecting to a flue pipe which require a separate
automatic fuel-oil or gas burner. NXR3i boilers have the following
characteristics:
3.2 Technical specifications
Conditions of use:
Maximum operating temperature: 100 °C
Maximum operating pressure: 6 bar
Thermostat adjustable from 30 to 90°C
Safety thermostat: 110 °C
Boiler
Useful output
Power input
Water content
Number of sections
Stand-by losses - 50 °C (A)
Number of baffle plates
Water resistance
Flue gas temperature (C)
Pressure in the furnace for nozzle pressure = 0 (C)
(D)
Mass flue gas flow rate (C)
Flue gas circuit volume (Flue ways + Combustion
chamber)
Combustion chamber
Weight (empty)
In order for the boiler to operate correctly, it is imperative
to respect the draught at the nozzle: 0 at the nozzle.
(A)
Stand-by losses in accordance with prevailing standard
(B)
1 mbar = 10 mmWG = 10 daPa
(C)
Nominal operation (top boiler power)
8
NXR3i-4
kW
kW
l
%
mbar
∆ T = 15K
(B)
°C
mbar
(B)
Fuel oil
Kg/h
Natural gas
Kg/h
3
m
Inscribed
mm
diameter
Length
mm
3
Volume
m
kg
- Heating body in cast iron.
- KSF ISR or KSF CE control panel.
- Production of domestic hot water can be ensured by a separate hot
water calorifier.
Test conditions:
CO
Fuel oil = 13%
²
CO
Natural gas = 9.5%
²
Ambient temperature: 20 °C
NXR3i-5
NXR3i-6
70-105
105-140
140-180
76-117
115-156
153-199
96
116
136
4
5
0.17
0.14
0.13
6
10
10
6.2
10.9
20.4
210
210
210
0.3
0.6
1.1
178
238
306
187
250
321
0.163
0.206
0.249
377
377
377
571
731
891
0.096
0.122
0.148
612
736
846
NXR3i
NXR3i
NXR3i-7
NXR3i-8
180-230
230-280
197-253
252-309
156
176
6
7
8
0.11
0.10
6
6
30
44.5
210
210
1.6
2.2
391
475
410
499
0.292
0.335
377
377
1051
1211
0.174
0.200
981
1103
28/08/2012 - 300029292-001-02
28/08/2012 - 300029292-001-01
NXR3i-9
280-330
305-361
196
9
0.09
6
63.8
210
2.5
560
588
0.378
377
1371
0.226
1230
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