GT/GTM/GTG 300/II GT/GTM/GTG/GTI 300 K/II GT/GTM 300 ...

4.2 Filling the system
Filling shall be performed with a low flow rate from a low
point in the boiler room in order to ensure that all the air
in the boiler is vented from the high point of the system.
VERY IMPORTANT : Instructions for starting
up the boiler for the first time after
the system is fully or partly drained :
If all the air is not vented naturally to an
expansion tank which opens out onto the
air, the system must include manual venting
valves, in addition to automatic venting
valves with the capability to vent the system
by themselves when it is
operating. The manual venting valves are
used to vent all the high points of the system
and to make sure that the filled system
is free of air before the burner is turned on.
4.3 Sludge removal
A tapped 2” 1/2 hole with a plug has been provided on
the bottom of the front of the boiler to remove the sludge.
Fit a quarter-turn valve on the opening to remove
the sludge (the fitter can also use the optional desludging
kit - package FD 37). Sludge removal leads to the
draining of large quantities of water. After this operation,
fill the installation according to § 4.2.
5. CHIMNEY CONNECTION
5.1 General recommandation
The high-performance features of modern boilers and
their use in specific conditions as a result of the advance
in burner technology (e.g. modulated low-temperature
operation) lead to very low flue gas temperatures.
This requires :
- 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;
5.2 Flue size
Refer to applicable regulations while determining the
size of the flue. Please note that GT 300/II boilers have
pressurised furnaces and that the pressure at the nozzle
must not exceed 0 mbar, unless special precautions
have been taken to seal the connection between the
nozzle and the chimney outlet.
5.3 Connection between boiler and flue pipe
The boiler shall be connected to the flue pipe in accordance
with codes of practice with a sealed pipe made
of material capable of withstanding hot combustion gas
and any acid condensation. 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
10
Always stop the recycling pumps before filling.
Do not add cold water suddenly into the
boiler when it is hot.
Note : never replace a boiler in an existing system
without carefully rinsing the system first. Install a sludge
decanting pot on the return pipe, very close to the
boiler.
- the installation of a draining tee at the foot of the
chimney.
The use of a draught moderator is recommended as
well.
If required, the baffle plates of the four upper flue ways
may be removed partly to increase the flue gas temperature.
the boiler outlet, i.e. ø 180 mm for boilers with 4, 5 and
6 sections and ø 200 mm for those with 7, 8 and 9
sections.
To allow the setting of the burner and control of the
combustion, the installer must preview a measurement
hole (10 mm ø) on the flue pipe.