10
Viscount GTS -
Installation & Servicing
INSTALLATION
7 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 (less than 160°C).
This requires :
-
Flue insulation.
-
the use of flue pipes designed to enable the flow of
condensates which may result from such operating
modes, in order to prevent damage to the chimney.
-
the installation of a draining tee at the foot of the chimney.
The use of a draught moderator is recommended as well.
Flue Size
Refer to applicable regulations while determining the size and
height of the flue. Please note that GTS boilers have pressurised
and tight furnaces and that the pressure at the outlet must not
exceed 0 mbar, unless special sealing precautions have been
taken, for instance in order to connect a static condenser.
Detailed recommendations relating to the design of flues for GAS
fired appliances are quoted in BS. 6644 and IGE Publication
UP/10, whilst BS. 5410 Pt. 3 similarly applies to OIL fired boilers.
Connecting to the flue
The connection shall be removable, and offer minimum load
losses, i.e. it must be as short as possible with no sudden change
815mm
F
Ø
chimney
connection
586mm
586mm
K
vis9134
in section.
Its diameter shall always be at least equal to that of the boiler
outlet, i.e. :
-
ø 400 mm for 14-20 sections
-
Boilers with 21-25 sections are supplied with a plain
plate. The maximum cutout 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).
GTS
14
15
16
17
18
19
20
21
22
23
24
25
ø
F (mm)
400
400
400
400
400
400
400
K (mm)
10
-19
-18
3
4
25
-24
-23*
-2*
-1*
20*
21*
plain
plate
plain
plate
plain
plate
plain
plate
Plain
plate
* Dimension representing the end of the 100 mm long chimney connection.
Note
: with models 21, 22, 23, 24 and 25 a plain plate which requires cutting out is supplied without the 100 mm long chimney connection.
INST
ALLA
TION
