Hoval UltraGas 250D Instructions D'installation page 14

INSTALLATION
4.3 Chimney dimensions (overpressure)
Principles
• Height above sea level max. 1000 m
The first two metres of the flue pipe must ha ve the same
dimension as the flue gas out let.
• Combustion air:
- In the case of room air-independent operation (ac-
cessories optional) the air pipe must be at least the
same dimension as the flue gas pipe.
- If the flue gas line diameter is greater than that of the
combustion air line, an individual calculation must be
made.
• Flue gas overpressure set:
- Compellingly necessary, included in the scope of de-
livery!
Boiler
Type Flue gas dim.
UltraGas internal
®
(250D) 254
(300D) 254
(250D) 254
(300D) 254
(400D) 306
(500D) 306
(400D) 306
(500D) 306
(600D) 306
(700D) 356
(800D) 356
(900D) 356
(1000D) 356
(700D) 356
(800D) 356
(900D) 356
(1000D) 356
(1150D) 356
(1300D) 356
(1150D) 356
(1300D) 356
(1440D) 356
(1700D) 500
(2000D) 500
Notice: The data contained in the table "Dimensions flue gas systems" represent guide values.
An exact calculation for the flue gas duct must be made on site.
* With 5 bends or more the feed pressure total at the combustion air/flue gas pipe is to be reduced by 30% for the calculation.
4.4 Flue gas line dimensions
(negative pressure)
The flue gas system is to be dimensioned in such a way
that no back circulation is possible in the room. A safe
operation of the flue gas system has to be proved by ap-
proved measuring principles.
14
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Flue gas line (smooth walled)
Dimension
DN
200
250
300
350
400
500
500
Number of bow 90° (flue gas + air supply)
Total pipe length in m (flue gas + air supply)
1 2 3
50 50 48
35 33 30
50 50 50
50 50 50
50 50 50
38 35 32
50 50 50
50 50 50
50 50 50
50 50 50
45 40 35
32 27 22
26 21 15
50 50 50
50 50 50
50 50 50
50 50 50
35 25 14
17 6 –
50 50 50
50 50 50
50 50 50
50 50 50
50 50 50
4 5 *
45
27
50
50
50
29
50
50
50
50
31
17
12
50
50
50
42
–
–
50
50
42
50
50
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