Kalvis 4 - Product Description; Technical Information

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4. Product description
4.1. Technical information
Table 1
Boiler model
Kalvis - 4
Nominal power *
1
(bottom firegrate / top firegrate *
2
)
kW
18 / 16
Release to heating system (bottom firegrate / top firegrate *
2
)
kW
15 / 13
Release to premises (bottom firegrate / top firegrate *
2
)
kW
3 / 3
Heated area (energy efficiency according to
STR 2.01.02:2016)
B class buildings *
3
m
2
155 ... 378
C class buildings *
3
83 ... 198
Fuel used
firewood *
4
Fuel moisture
%
25
Efficiency factor, when stoking with firewood
%
76
Combustion chamber volume (bottom firegrate / top firegrate *
2
)
dm
3
(l)
70 / 40
Fuel load weight, up to *
1
(bottom firegrate / top firegrate *
2
)
kg
18 / 9
Fuel load burning duration, up to *
5
(bottom firegrate / top firegrate *
2
)
val.
3 / 1,5
Recommended size of firewood (length when loading along chamber), up to,
cm
35 x Ø10
Fuel loading hole dimensions, no less than, height x width
mm
230 x 290
Escaping flue temperature, no more than
ºC
230
Operating water pressure in the boiler
no less than
bar (MPa)
0,3 (0,03)
no more than
1,5 (0,15)
Hydraulic test pressure
bar (MPa)
4 (0,4)
Water volume in the boiler
l
55
Max allowed water temperature
in closed heating system
ºC
90
in open heating system *
6
ºC
70
Min boiler return water temperature during operation
ºC
60
Recommended boiler return water temperature during operation
ºC
70 ... 90
Connection branch pipe diameter
mm
G1½B
Release branch pipe diameter
mm
-
Min distance to combustible materials
mm
380
CO release volume
%
1
Operation environment temperature
ºC
3 ... 40
Boiler flue pipe dimensions – relative diameter
mm
Ø 160
Chimney draught
no less than
Pa
14
no more than
17
Exhaust flue temperature at nominal power, up to
ºC
230
Exhaust gas volume at nominal power
kg/s
0,018
Overall dimensions, no more than (net/gross):
height
width
length
mm
mm
mm
910 / 1055
550 / 800
1100 / 1200
Weight (net/gross) no more than
kg
195 / 205
*
1
If stoking with 18-20 % moisture birch firewood. It is not recommended to use firewood with moisture
over 25 %.
*
2
When stoking the boiler, firegrate can be put in the bottom or top position.
*
3
According to STR 2.01.02:2016 Design and certification of energy performance of buildings requirements
calculated energy volume, expressed for building energy performance classes B an d C.
*
4
The use of wood chips, sawdust briquettes can be used as a spare fuel.
*
5
The burning time of the fuel load depends on the type of fuel, humidity, outdoor temperature and other
factors.
*
6
It is not recommended to install a boiler with an accumulator tank in an open heating system. Intensive
boiler firing at an ambient temperature close to 70 °C will cause water to boil in the boiler, resulting in
extraneous sounds.