GENERAL
16
b
The stack must guarantee the minimum draught specified by applicable technical standards, assuming zero pres-
sure at the connection to the flue gas exhaust.
b
Values obtained with
r
GULLIVER RG burners with CO
2
= 12,5% and GULLIVER BS burners with CO
2
= 9,5%.
DESCRIPTION
MODEL
g
NK
3/100 4/100 5/100 6/100 7/100 8/100
3/60
4/60
Fuel
Gas / oil
Heat input at furnace
Minimum 16,3
27,2
36,0
46,1
55,0
63,0
16,3
27,2
kW
Maximum 26,5
34,8
44,3
53,1
62,0
70,0
26,5
34,8
kW
Rated useful heat output Pn
Minimum 14,9
25,0
33,0
42,3
50,0
57,6
14,9
25,0
kW
Maximum 23,9
31,5
40,2
48,2
56,2
63,8
23,9
31,5
kW
Useful efficiency at Pn
Minimum 91,4
91,9
91,7
91,8
90,9
91,4
91,4
91,9
%
Maximum 90,2
90,5
90,7
90,8
90,6
91,1
90,2
90,5
%
Useful efficiency at 30% max. Pn
90,9
91,3
91,6
92,0
91,8
92,0
90,9
91,3
%
Constant pressure drop
2,3
1,8
1,3
1,2
1,0
0,9
2,3
1,8
%
Flue gas temperature (∆T)
> 140
°C
Maximum flue gas flow rate (gas/oil)
0,010 0,013 0,017 0,020 0,024 0,027
0,010
0,013
Kg/s
CO
2
(gas/oil)
9,5/12,5
%
Furnace pressure
Minimum 0,03
0,12
0,17
0,26
0,33
0,47
0,03
0,12
mbar
Maximum 0,10
0,17
0,26
0,36
0,42
0,60
0,10
0,17
mbar
Furnace volume
16
22
28
34
40
46
16
22
dm
3
Total volume of flue gas side
22
31
39
47
55
63
22
31
dm
3
Total surface area for heat exchange
0,93
1,30
1,67
2,04
2,41
2,78
0,93
1,30
m
2
Volumetric heat load
1656
1582
1582
1562
1550
1522
1656
1582
kW/m
3
Specific heat load
25,7
24,2
24,1
23,6
23,3
22,9
25,7
24,2
kW/m
2
Maximum working pressure
4
bar
Safety thermostat trip temperature
110
°C
Maximum working temperature
82
°C
Minimum admissible water return temperature
35
°C
Pressure drop ∆T 10°C
4
6
10
14
20
26
4
6
mbar
Pressure drop ∆T 20°C
1,2
1,6
2,5
3,5
5,0
7,0
1,2
1,6
mbar
Water capacity
13,7
17,2
20,7
24,2
27,7
31,2
13,7
17,2
l
Turbulators
5
5
2
2
-
-
5
5
n°
Index of protection
X0D
IP
(*) Inlet water temperature 13°C; average outlet temperature 43°C.
- Performance obtained with fill pump at maximum speed.
STORAGE CYLINDER
CHARACTERISTICS
MODEL
g
NK
3/100 4/100 5/100 6/100 7/100 8/100
3/60
4/60
Storage cylinder type
Vitrified
Cylinder layout
Vertical
Heat exchanger layout
Vertical
Power consumption
23,8
31,3
31,3
31,3
31,3
31,3
23,2
30,9
kW
Storage cylinder capacity
100
60
l
Coil water capacity
6,9
6,6
l
Heat exchanger surface area
1,10
1,01
m
2
Domestic hot water production with ∆T 35°C
585
770
770
770
770
770
570
760
l/h
Water draw in 10' with storage cylinder at 48°C (*) 160
170
185
185
185
185
115
125
l
Water draw in 10' with storage cylinder at 60°C (*) 210
230
230
230
230
230
140
150
l
Replenishment time with ∆T 35°C
14
10
11
11
11
11
12
10
min
Maximum working pressure 7 bar
7
bar
