9
Tab. no. 5) Thermal - technical parameters of G 42 ECO boiler with burner Furigas equipped with
SINGLE STAGE or DOUBLE STAGE GAS VALVE and designated for NATURAL GAS
COMBUSTION
(thermal power 34,26 MJ. m
-3
, gas temperature 15°C a bar. air pressure 1013,25 mbar)
Number of sections
pc
4
5
6
7
Rated heat output maximum
kW
26
34
41
49
Rated heat output minimum
kW
18
27
35
42
Rated heat input maximum
kW
28,04
37,28
44,71
53,73
Rated heat input minimum
kW
19,37
29,68
38,38
46,34
Gas volume flow rate at maximum heat
output
m
3
.h-1
2,946
3,917
4,698
5,646
Gas volume flow rate at minimum heat
output
m
3
.hod
-1
2,035
3,119
4,033
4,869
Gas volume flow rate at maximum heat
output
dm
3
.min
-1
49,10
65,28
78,30
94,10
Gas volume flow rate at minimum heat
output
dm
3
.min
-1
33,92
51,98
67,22
81,15
Boiler efficiency at maximum heat output
%
91 – 93
Boiler efficiency at minimum heat output
%
90,5 – 93
No
x
category
category 5
Combustion products temperature in smoke
flue at maximum heat output
°C
104 – 125
Combustion products temperature in smoke
flue at minimum heat output
°C
80 – 100
Real volume of dry combustion products at
maximum heat output
m
3
.m
-3
26,97
23,89
21,15
19,43
Real volume of dry combustion products at
minimum heat output
m
3
.m
-3
42,03
29,3
23,96
25,2
Connecting gas overpressure
mbar
20
Gas overpressure on burner nozzles at
maximum heat output
mbar
15,5
14,8
14,7
13,3
Gas overpressure on burner nozzles at
minimum heat output
mbar
7,8
0,95
11,3
0,99
Number of nozzles
3
4
5
6
Nozzles diameter
mm
2,45
2,45
2,45
2,5
Note:
At a single stage valve the heat output is pre-set by the manufacturer to the maximum.
4.
Boiler construction
The cast-iron sectional boiler drum made of grey cast iron according to
Č
SN 42 2420 - „Cast iron 42 2420
with laminated graphite“ is the main part of the boiler.
The boiler construction corresponds to the strength requirements according to
Č
SN 07 0240 Warm-water and law-pressure steam boilers
EN 297
Gas – fired central heating boilers – Type B
11
and B
11BS
fitted with atmospheric burners of
nominal heat input not exeeding 70 kW
The boiler output is determined by number of sections. Individual sections are connected by means of forced
on insertions
φ
47 mm (length 36 mm, angle 1°45") and are tightened by anchor bolts thus creating the
combustion space, convection surface and boiler water volume inside the sections. The convection surface
construction allows cleaning the boiler drum mechanically by using the enclosed brush. The heating water
inlet and outlet in the rear part of boiler is equipped with pipes 1”. At the return water connection there is
installed the discharge valve. At the heating water outlet there must be installed an automatic bleeder valve
which is included in the serial delivery. The whole boiler drum is insulated by using a harmless mineral
insulation, which reduces the losses caused by heat transfer to the ambient.
To the upper part of boiler drum there is fastened by means of screws an inbuilt draught diverter with the
neck for putting on a smoke pipe. The draught diverter is equipped with a dismountable cleaning cover.
The boiler drum is positioned on a steel base closing the burner space from below. The anticorrosive steel
cover plate and thermal insulation belong to the boiler drum.
The boiler steel shell surface is coated with a good quality comaxit paint.
For version G 42 ECO the atmospheric burner consists of low-emission burner tubes in oval new type
design made of anticorrosion steel with a long service life. Individual tubes are fastened on the burner plate
by four screws. At two and three sectional boiler versions there are used the burner tubes of VI OVO 1G
Summary of Contents for GARDE G 42 ECO
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