Boiler Usage And Advantages; Boiler's Technical Parameter - Viadrus U22 Economy Series Manual For Operation And Installation

Dear customer,
We thank you that you have bought a VIADRUS U22 Economy boiler, thus having shown your confidence in VIADRUS brand.
To get you accustom from the very beginning to correct handling with your new boiler, please firstly read this manual for its using, especially
Chapter No. 7. – Boiler servicing by an user, Chapter No. 8 – Maintenance, and Chapter No. 9 – Important warning. Please observe the below
mentioned information, in order to ensure a long-term trouble-free operation to your and our satisfaction.
The VIADRUS U22 Economy boiler is a cast-iron sectional gasifying boiler destined for ecological combustion of lump wood.
Combustion of other substances (for example, plastics) is not allowable.
1

Boiler usage and advantages

The VIADRUS U22 Economy boiler meets the requirements for heating of one-family houses, shops, etc.
The boiler is manufactured as a warm-water boiler with natural and forced circulation of heating water and work overpressure up to 400 kPa (4
bar). Before dispatching, the unit is tested with the testing overpressure of 800 kPa (8 bar).
Advantages of the boiler:
1. High service life of the cast-iron heat-exchanger and all other parts thanks to the quality of the used materials.
2. Long-term proven structure.
3. Sophisticated production technology on the automatic forming lines with permanent and proven quality of the production process (ISO 9001,
ISO 14 001).
4. Combustion efficiency up to 91 %.
5. Low fuel consumption.
6. Simple manipulation and maintenance.
7. Quick warming of the flue channel.
8. Water-tube massive grates
9. Threaded flanges for simple mounting
10. It meets emission class 5 according to ČSN EN 303-5, conditions of „Ecodesign" and demanding conditions of the German BImSchV Stufe
2 emission norm.
11. Possibility of operation independent on electric energy (without a forced withdrawal of flue gases and without a circulating pump, excepting
systems with a storage tank)
12. Patented system of the combustion chamber ViaBurn ™
2

Boiler's technical parameter

Tab. №. 1
Boiler's sizes and technical parameters
Boiler size - type
Combustion chamber volume
Water content
Weight
Combustion chamber depth
Chimney throat diameter Ø D
Boiler sizes: - height x width
- depth L
Feed port sizes
Maximum operation pressure
Minimum operation water
pressure
Testing water overpressure
Hydraulic loss
Minimum input water
temperature
Recommended minimum
output water temperature
Noise level
Boiler connections: - heating
water
- return water
Cooling water temperature for
the redundant heat exhaust
device
Cooling water overpressure for
the redundant heat exhaust
device
Tab. №. 2
Technical parameters of VIADRUS U22 Economy, fuel - wood, class A
fuel humidity, max. 20 %
Boiler size - type
Boiler class according to EN 303 – 5
Nominal power
Indicative fuel consumption.
Max. fuel weight in the feeding chamber
Flue gases temperature at the nominal power
Flue gases mass flow rate at the nominal power
Chimney draught
Combustion time
16 21
3
dm 32 39
l 40.5 46.5
kg 348 410
mm 280 370
mm
mm
mm 890 1000
mm
kPa
(bar)
kPa
(bar)
kPa
(bar)
-
°C
°C
dB
G 2" or G 1 ½" (* the size depends on the used type of the flange)
G 2" or G 1 ½" (* the size depends on the used type of the flange)
°C
kPa
(bar)
calorific value: 14 – 18 MJ. kg
16
- 5
16
kW
kg/h 3.9
kg 13
°C
140 - 190
kg/s 0.012
0.13
mbar
min. 2
h
25 30
41 51
46.5 52.0
410 472
370 480
156
1130 x 625
1000 1110
310x236
400 (4)
50 (0.5)
800 (8)
see Fig. No. 1
50
70
< 65
5 – 20
200 – 600
(2 - 6)
-1
21 25 30
5 5 5
21 25 30
5.1 5.9 7.2
17 19 22
140 - 190 140 - 190 140 - 190
0.014 0.015 0.016
0.16 0.18 0.21
min. 2 min. 2 min. 2
3
34 38
63 65
58.0 58.0 58.0
534 534 534
590 590 590
1220 1220 1220
34 38
5 5
34 38
8.5 9.4
24 26
140 - 190 140 - 190 140 - 190
0.018 0.019 0.022
0.25 0.32
min. 2 min. 2 min. 2
41
67
41
5
41
10.2
28
0.32