32
Specification
*
Values for upper/lower boiler output, relative to a CO
2
content of 13% (fuel oil EL) and an average
boiler water temperature of 60 °C. The chimney stack dimensions must be calculated in accordance
with DIN 4705. For flue gas temperatures below 160 °C, connect the boiler to highly insulated
chimney stacks (heat conductivity resistance class I acc. to DIN 18160 T1) or suitable,
moisture-resistant flue gas systems, which have been type-approved.
CNK / FNK / CNU-Premio / CNU-TH / FNU-TH
17
20
25
CNK-CB / FNK-FB / CNU-Premio-CB
17/155
20/155
25/155
CNU-TH-CB / FNU-TH-FB
FNK-FE / FNU-TH-FE
17/155
20/155
25/155
Output range
without burner
kW
14-17
17-20
20-25
incl. Premio burner
kW
14-17
17-20
20-25
incl. TH burner
kW
14-17
17-20
20-25
Set-up burner output
kW
16
19
23
DHW cylinder capacity CB & FB / FE
litres
155/150
155/150
155/150
Constant DHW cylinder output CB and FB
litres/h
410
490
615
FE
litres/h
410
490
615
Performance factor CB and FB
NL
60
2.7
2.8
3.0
FE
NL
60
2.7
2.8
3.0
Boiler water capacity
litres
51
51
58
Boiler gas content
litres
36
36
41
Heating water pressure drop (at
∆∆∆∆∆
T=20K)
mbar
6
6
6
Max. permissible boiler pressure
bar
3
3
3
Max. permissible DHW cylinder pressure
bar
10
10
10
Rel. standby losses
Boiler
%
1.8
1.6
1.2
DHW cyl.
%
2.5
2.2
1.8
Required boiler draught
Pa
2
3
5
Flue gas temperature*
° C
160/180
160/180
150/170
Flue gas mass flow rate*
kg/h
24/29
29/34
34/42
Boiler flow
G
1½"
1½"
1½"
Boiler, safety return
G
1½"
1½"
1½"
Filling, draining,
(male thread)
R
1"
1"
1"
Venting, safety flow
(male thread)
R
1"
1"
1"
Flue pipe diameter
mm
129
129
129
Combustion chamber length incl. handle
mm
545
545
615
Weight Boiler
kg
135
135
141
Burner
kg
10
10
10
CHW cylinder CB and FB
kg
66
66
66
DHW cylinder FE
kg
98
98
98
Electrical supply max. current (ctrl. unit and acc.)
Max. current (in total, excl. pumps)
Switching capacity pumps, mixer, burner
Control unit fuse (max. current)
Optional connection for mixer motors
