VIGAS 25 Lambda Control - 15. BOILER MAINTENANCE AND REPAIRS

Gasifying boiler Vigas
14.5 SERVICE BOILER CLEANING
Wood characteristic table
Wood
Fuel efficiency
[MJ/kg]
20% humidity
Fuel efficiency
[MJ/kg]
25% humidity
Hardness *
weight [kg/m
3
]
25% humidity
Poplar 12,9 12,3 1 530
Fir 15,9 14,0 1 575
Spurce 15,3 13,1 1 575
Willow 16,9 12,8 1 665
Pine 18,4 13,6 1 680
Alder 16,7 12,9 2 640
Birch 15 13,5 2 780
Maple 15 13,6 4 660
Beech 15,5 12,5 4 865
Ashen 15,7 12,7 4 865
Locust 16,3 12,7 4 930
Oak 15,9 13,2 4,5 840
[kg/m
3
] = [kg/fm], fm – fullmeter, * (1 very soft...5 very hard)
24
Important attention !!!
 Use only recommended fuel.
 It is advise not to overload the boiler with fuel when in temporary period, boiler tar can be decresed.
 When adding fuel, do not let it remain between flange and chimney flap, which can cause inaccuarte flap
closure.
 It is important to lay fuel properly, so it will not stop upper door to close. Forced closing may damage door
concrete inwall.
 We recommend to supervise boiler according to operating conditions only by person over 18 years old.
 Gasification chamber cleaning
It is necessary to remove tar from gasification chamber once per week. We
recommend to burn it with upper door and chimney flap open. If there is extra ash
which did not fall through the nozzle (9)pic.3 into fireclay combustion chamber, this
should be removed from time to time. Fuel bunker will be increased to original size
and primary air flow through nozzle will be increased.
During optimal wood burning and keeping minimum temperature of the water reverse at 60 °C is gasifying
chamber and exchanger sooted only slightly. By using dampy wood, steam may condense on the walls of
the combustion chamber, which creates tar on the surface.
 Exchanger cleaning
It is necessary to clean exchanger pipes once per month using fire rake (round plate).
Recommendation: If you do not clean exchanger on time and it is clogged with tar, do not use dissolvent.
The boiler must be cleaned while hot! Heat boiler through open upper door and chimney flap approx. to
80°C (without fan).Then close flap and door. Carefully (use gloves) open exchanger cover. Clean clogged
pipes with relevant accessories. After cleaning, close exchanger cover and let the boiler burn / gasify /
approx. 5 hours at maximum performance, in order to get rid of remaining tar. Try to avoid this condition in
the future.
Warning: During cleaning must be boiler room very well ventilated!
 Combustion chamber cleaning
Sweep ash and dust that fell into combustion chamber with
a scraper. It is recommended to sweep ash, which settles in
combustion chamber once in 3 - 5 days.
Step 1.
Step 2. Step 3.
Gasifying chamber
VIGAS 25,40
Gasifying chamber
VIGAS 60,80,100
Combustion
chamber
Humidity dependence period
( wood cuts)
Fir
SPURCE
Beech
Recommended humidity 20%
OAK
12
14
16
18
20
22
24
26
28
30
6 12 18 24
Number of months after cutting
humidity [%]