21
AR3
AR4
AR5
ARB4
ARB5
Output
kW
18.9
29.4
40.0
29.4
40.0
kcal/h
16,300
25,300
34,400
25,300
34,400
Input
kW
21.5
33.4
45.4
33.4
45.4
kcal/h
18,500
28,700
39,000
28,700
39,000
Sections
n°
3
4
5
4
5
Maximum water head
bar
4
4
4
4
4
Water content
l
19
23
27
27
31
Loss of head
Smoke
mbar
0.10
0.12
0.16
0.12
0.16
Water (
∆
t 10°C)
mbar
1.80
2.50
3.50
2.50
3.50
Combustion chamber pressure
mbar
– 0.02
– 0.01
– 0.01
– 0.01
– 0.01
Minimum chimney depression
mbar
0.12
0.13
0.17
0.13
0.17
Smokes temperature
°C
219
219
219
219
219
Smokes flow
m
3
n/h
20.5
31.8
43.2
31.8
43.2
Smokes volume
dm
3
7
11
15
11
15
CO
2
%
11,1
11,1
10,5
11,1
10,5
Adjustment range
Heating
°C
30÷85
30÷85
30÷85
30÷85
30÷85
D.H.W. production
°C
–
–
–
30÷60
30÷60
D.H.W. flow rate
∆
t 30°C *
l/h
–
–
–
870
870
D.H.W. tank capacity
l
–
–
–
80
80
D.H.W. tank max. water head
bar
–
–
–
6
6
Weight
kg
92
122
147
179
203
1.3
TECHNICAL FEATURES
KEY
1
Cast iron boiler
2
Hydrometer
3
Automatic air-vent (not supplied)
4
Pressure relief valve (not supplied)
5
Non-return valve
6
D.H.W. tank pump
7
Boiler drain cock (not supplied)
8
D.H.W. tank expansion vessel (not supplied)
9
D.H.W. pressure relief valve (not supplied)
10 D.H.W. drain cock
11 Magnesium anode
12 Tank
13 Burner (not supplied)
14 System circulation union
1.4
FUNCTIONAL DIAGRAM “ARB”
Fig. 2
* With the sanitary water at inlet temperature 15°C - Boiler temperature 80°C