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5.4.5 I-Series (Internal) Combination & Combination Professional Boilers
MODEL I21C / I21C PRO I26C / I26C PRO I33C / I33C PRO
Nominal
Heat Output
kW
Btu/hr
14.7
50,000
17.6
60,000
21.0
71,650
21.0
71,560
23.5
80,000
27.1
92,380
27.1
92,380
29.0
99,050
32.7
111,600
Nominal
Heat Input
kW
Btu/hr
15.3
52,150
18.4
62,600
22.0
75,000
22.0
75,000
24.4
83,175
28.0
95,550
28.0
95,550
30.0
102,400
34.0
116,000
Burner
RDB 2.2 BX 15-21 RDB 2.2 BX 21-27 RDB 2.2 BX 27-33
Head
BX500 BX700 BX700
Secondary Air Damper B N/A N/A
Conventional
Flue Diameter
mm
in
100 or 125
4 or 5
100 or 125
4 or 5
100 or 125
4 or 5
Flue Gas Temp.
0
C
86
88
90 90
93
95 95
98
110
Smoke Bacarach
0 0 0
Kerosene Settings
Nozzle make
Danfoss 80°EH Danfoss 80°ES Danfoss 80°ES
size
0.45
0.55
0.60 0.55
0.65
0.75 0.75 0.85 0.85
Oil Pump
Pressure
bar
psi
6.8
99
8.0
116
8.0
116
10.0
145
8.7
126
45.0
102
9.0
131
8.0
116
10.0
145
% CO
2
Recommended
Maximum
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
11.5
12.5
Approx Fuel
Flow Rate
litres/h
Gals/h
1.65
0.36
1.98
0.44
2.35
0.52
2.35
0.52
2.65
0.58
2.98
0.65
2.98
0.65
3.40
0.75
3.81
0.84
Combustion Head
Position
mm
11.0
11.5
12.5 12.5
14.5
15.0 15.5
18.0
18.0
Water
Content
litres
gals
64
14.1
64
14.1
64
14.1
Boiler Weight Wet kg
221 221 221
Domestic Hot Water (DHW) Production
Minimum Inlet Dynamic
Pressure for Maximum
DHW Flow Rate
bar
1.8
26
1.8
26
1.8
26
Maximum Achievable DHW Flow Rate Unrestricted Unrestricted Unrestricted
Maximum Recommended
DHW Flow Rate
litres/m
gal/m
18
4.0
18
4.0
18
4.0
Factory Set
DHW Flow Rate
litres/m
gal/m
18
4.0
18
4.0
18
4.0
Minimum
DHW Flow Rate
litres/m
gal/m
2.5
0.55
2.5
0.55
2.5
0.55
DHW Temperature Rise
(at Maximum Output)
32°C @ 18 litres/min
for 120 litre draw-off
32°C @ 22 litres/min
for 120 litre draw-off
32°C @ 24 litres/min
for 120 litre draw-off
Pressure Relief
bar
psi
2.5
0.55
2.5
0.55
2.5
0.55
Cold Water Mains Inlet Connection Minimum 15mm Minimum 15mm Minimum 15mm
DHW Outlet Connection 22mm Copper 22mm Copper 22mm Copper
Flow Connection 22mm Copper 22mm Copper
22mm Copper / 28mm
Compression
Return Connection 22mm Copper 22mm Copper
22mm Copper / 28mm
Compression
Factory Settings Highlighted in bold
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