Adisa ADI LT 105, Техническое руководство по установке и обслуживанию

Страница: 34 / 57

ADI LT boiler – Technical manual Page
34
15.6 CHIMNEYS
The flues outlet, according to the current rules, must ensure a correct evacuation of the burnt gases, without
backward flows and without producing condensed products. The natural draught of the chimney must evacuate
the burnt gases from the boiler flues outlet.
15.6.1. Chimney sizing
The internal diameter depends on:
- Heat input of the boilers, type, number of boilers installed and water working temperatures.
- Type of gas.
- Chimney: vertical height, horizontal length (minimum slope: of 3 to 5%).
- Number of elbows and their angles (they should be reduced to the minimum).
- The chimney material and if it is insulated or not.
If several boilers are connected to the same chimney, it is important to consider the distance between them and
the dimensions of the flue header.
With regard to boilers, these are the data to be considered for calculation:
-
Draught of the chimney (when cold) at the boiler outlet: between -5 Pa and -9,8 Pa. In case of excessive
draught / depression (this can cause vibrations in the chimney), you have to install a flue draught stabilizer
inside the chimney (see paragraph 15.6.2).
-
Values of CO2, for Natural Gas
Models Range CO2 (%) for Natural Gas
ADI LT 105 to 200 7,2 - 9%
ADI LT 250 to 475 7,2 - 8,2%
ADI LT 550 to 750 7,5 - 9%
- Flues temperature:
The base of the vertical chimney must include a drainage pipe to evacuate the condensed products.
15.6.2. Flue draught stabilizer
In case of excessive draught / depression (this can cause vibrations in the chimney), you have to install a flue
draught stabilizer inside the chimney.
In this case, you have to install a stabilizer for each boiler to guarantee the correct draught of the chimney in all
the boiler operating modes: at the minimum power, at the maximum power and at intermediate points.
Example of a flue draught stabilizer:
Flues temperature, with the burner operating at Average water
temperature in the
boiler (ºC)
Minimum power (30% of the total) High fire (100%)
40ºC Between water return temp. and 40ºC Between 40 and 50ºC
70ºC Water return temperature 70 to 80ºC