Chimneys - Adisa ADI CD 70 Technical Manual Of Installation, Use And Maintenance

ADI CD boiler - Technical Manual

17.6 Chimneys

The flues outlet, according to the current rules, must ensure a correct evacuation of the burnt gases, without
backward flows and without producing condensate. The natural draught of the chimney must evacuate the burnt
gases from the boiler flues outlet.
17.6.1 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: 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.
The base of the vertical chimney must include a drainage pipe to evacuate the condensate.
With regard to boilers, these are the data to be considered for calculation:
- Values of CO , for Natural Gas: it is recommended to adjust CO
2
- Flues temperature:
Flues temp.
Average Water temperature 
Flues Temp.
- Residual pressure at the boiler flues outlet:
Model Ø boiler flue outlet
External diam. (mm)
ADI CD
70
150
85
150
105
150
120
150
175
150
200
175
250
175
325
250
375
250
450
250
550
350
650
350
750
350
850
350
950
350
(*) Minimum power adjustable up to 30% of the gas power: to be adjusted onsite in the installation (during commissioning), according to the installation conditions.
Models Range CO2 (%) for Natural Gas
ADI CD 70 to 120
ADI CD 120 to 175
ADI CD 200 to 250
ADI CD 325 to 550
ADI CD 850 to 950
MAXIMUM POWER
High (70ºC) Low (40ºC)
70 - 80ºC 50 - 60ºC
MAXIMUM POWER
Power Input Residual Pressure
kW (Pa)
42.0
72.7
87.7 37.8
107 90.0
123 64.8
166 54.0
60.0
202.2
246.5 81.0
300.5 90.0
361.2 64.8
448 90.0
72.0
546
618 75.0
78.0
700
177.5
818.5
266.2
924.5
at 8.1%, for all the boilers
2
7.3 - 9.3%
7.2 - 8.7%
7.3 - 8.8%
7.6 - 8.6%
7.7 - 9.0%
MINIMUM POWER
High (70ºC) Low (40ºC)
60 - 70ºC 40ºC
MINIMUM POWER
Power Input Residual Pressure
kW (Pa)
2.5
21.8
26.3 7.5
32 40.0
37 5.0
49.8 10.0
7.5
60.7
74 8.5
90.2 20.0
108.4 7.5
134 45.0
10.0
163.9 (*)
185.4 (*) 10.0
7.5
210 (*)
24.7
327.4
39.4
369.8
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