Description; Boiler Structure; Regulating And Safety Elements - Viadrus U22 Economy Series Manual For Operation And Installation

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Description

3.1

Boiler structure

The main part of the boiler is a cast-iron sectional boiler drum made of grey cast iron according to ČSN EN 1561, EN-GJL-150.
Pressurized parts of the boiler meet requirements for the stiffness according to ČSN EN 303-5.
The boiler drum is compiled from sections with help of pressed boiler inserts with a diameter of 56 mm and is fixed by boiler screws. The
sections create a filling well, combustion chamber and ash-pan, water space and convective part of the boiler. The input and output of heating
water is situated in the rear part of the boiler.
The rear section of the boiler, in its upper part, has a chimney pot and a heating water flange; and its bottom parts - a return water flange.
Stocking and ash-pan doors are fixed to the front section. An inclined grate is placed in the feeding chamber. The entire boiler drum is insulated
with health harmlessness mineral insulation that decreases losses by heat transmission into the environment. The steel cladding of the boiler is
painted with high-quality komaxit spray-type painting.
1. Front section
2. Middle section
3. Single-pass middle section
4. Penultimate section
5. Rear section of the combustion chamber
6. Cladding
7. Stocking door throttle valve
Fig. №. 3
Main parts of the VIADRUS U22 Economy boiler
3.2

Regulating and safety elements

The stocking door throttle valve regulates the supply of the primary combustion air above the fuel. It is controlled with a draught regulator or
manually with help of a throttle valve set screw.
The combined device, thermo-manometer, is designed for the determination of heating water temperature as well as for water pressure in the
heating system. The well of the thermo-manometer sensor is situated in the upper part of the boiler front section.
8. Stocking door
9. Ash-pan door
10. Shorting shutter
11. Shorting shutter control
12. Chimney pot
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