Chimney Connection; Flue Size - OERTLI PK 550 Installation And Service Manual

4. Installation

4.4 Chimney connection

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 (<160°C).
4.4.1

Flue size

Refer to applicable regulations while determining the size of the flue.
Please note that PK 550 boilers have pressurised and tight furnaces
and that the pressure at the connection to the chimney must not
exceed 0 mbar, unless special sealing precautions have been taken,
for instance in order to connect a static condenser/regenerator.
4.4.2 Chimney connection
The connection shall be removable, and offer minimum load losses,
i.e. it must be as short as possible with no sudden change in section.
Its diameter shall always be at least equal to that of the boiler outlet,
i.e.:
Ø 300 mm for 9 sections
Ø 350 mm for 10 to 13 sections
Ø 400 mm for 14 to 20 sections
Boilers with 21 to 25 sections are supplied with a plain plate. The
maximum cut-out dimensions are 500 x 700 mm.
Fit a measuring point (Ø 10 mm hole) on the flue, in order to adjust
the burner (combustion check).
PK PK
PK
Boiler
550- 550-
550-9
10 11
Ø F 300 350 350
K 5 26 27
*Dimension representing the end of the 100 mm long chimney
connection.
Note: with models PK 550-21, PK 550-22, PK 550-23,, PK 550-24
and PK 550-25, a plain plate which must be cut out is supplied
without the 100 mm chimney connection.
16
PK PK PK PK PK
550- 550- 550- 550- 550-
12 13 14 15 16
350 350 400 400 400
48 49 10 -19 -18
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.
The use of a draught moderator is recommended as well.
PK PK PK PK PK
550- 550- 550- 550- 550-
17 18 19 20 21
400 400 400 400
3 4 25 -24 -23*
PK 550
PK PK PK PK
550- 550- 550- 550-
22 23 24 25
Plain plate
-2* -1* 20* 21*
18/03/2016 - 300020192-02