Chimney Connection - DeDietrich GT 224 Installation And Service Manual

3.3 Chimney connection

Connection must comply with the prevailing local and national
regulations.
The high-performance features of modern boilers and their use in
specific conditions as a result of the advance in burner technology
(e.g. first-stage or low modulation range operation) lead to very low
flue gas temperatures.
3.3.1 Flue size
The following table indicates per boiler model the minimum chimney
dimensions to be respected to ensure the draught required at the
nozzle.
Boiler type
GT 224
GT 225
GT 226
GT 227
GT 228
* 1 Pa = 0.01 mbar
(1): Maximum boiler output
3.3.2 Connection to the flue gas pipe
The appliance must be installed in accordance with the Codes of
Practice using a leak proof pipe made of a material capable of
withstanding hot combustion gases and any acidic condensation.
The connection between the boiler nozzle and the chimney flue, with
a cross section equal to that of the nozzle, must be as direct and as
short as possible.
Boiler type
GT 224 - GT 225
GT 226 - GT 227 - GT 228
22/01/09 - 300008281-001-E
Mass flue gas flow rate
(1) (2)
Output
kW Kg/h
40-50 83
50-64 106
64-78 129
78-92 152
92-100 166
Smoke nozzle Ø A
Ø 153
Ø 180
For this reason:
- Use flue gas pipes designed to enable the flow of condensates
which may result from such operating modes in order to prevent
damage to the chimney.
- Install a draining tee at the bottom of the chimney.
- Install a draught moderator (recommended).
Smoke temperature
(2)
(13% CO on fuel
(13% CO
2
oil)
oil)
°C
< 195
< 195
< 195
< 205
< 205
(2): Boiler temperature: 80 °C (Ambient temperature: 20 °C)
GT 220 - GT 2200
(1)
Chimney: Minimum
recommended
on fuel
2
dimensions
Min Ø Height
mm m
150 5
150 5
180 5
180 5
180 5
3. Installation
17