14
2.2.5
NOTES ON CONDENSATE
DRAIN
Avoid the condensate stagnation inside
the combustion products evacuation
system, (for this reason the evacuation
duct must have an inclination toward the
drain of at least 30 mm/m) except the
liquid column, inside the condensate
siphon (which needs to be filled with
water after installation: its minimum
height, when all the fans are in opera-
tion, must be at least 25 mm).
In order to avoid ice formation while the
boiler is operating, which can cause the
stop of the boiler, the whole condensate
evacuation system has to be well insu-
lated. It is forbidden to evacuate the con-
densate through a gutter: risk of ice for-
mation and corrosion.
The condensate, before being evacua-
ted to the sewer , has to be neutralised,
neutralization which can be obtained by
mixing the drain water coming from
washing machines, dish washing ma-
chines, etc., which normally have a
basic pH. The connection to the sewer
will be through a visible drain. Given
the high acidity degree (pH 3 to 5) only
plastic materials can be used for the
condensate evacuation pipes. Moreo-
ver it must be dimensioned and cons-
tructed so as to allow the correct out-
flow of drains preventing any bottleneck
and any leakage.
fig. 5
* Min. height of the condensate column,
with all fans operating at max. speed,
requested by the EN standards.
** Min. height of the condensate column,
with all fans operating at max. speed. In
the case it is not possible to create a 100
mm basement, install the boiler on the
floor and foresee a min. 100 mm well to
lodge the siphon (see fig. 2).
2.2.6 - WATER TREATMENT
If the installation needs a water treat-
ment the following conditions are to be
respected:
-
the pH, for boilers with aluminium
alloy body, must always be within
6.5 and 8;
2.2.6.1 - REPLACEMENT OF AN EXI-
STING BOILER BY A MODU-
LEX
In case of installation of a MODULEX on
an old C.H. system we recommend to
purge and to rinse properly the whole
system before connecting the new boiler.
To avoid misunderstandings it is sug-
-
all precautions will be taken to avoid
the formation and localisation of oxy-
gen in the water of C.H. systems. For
this reason it will be necessary that
in the C.H. systems using floor radiant
heating, the plastic pipes used are
impermeable to the oxygen;
-
in case of utilisation of anti-frost so-
lutions, their compatibility with alu-
minium alloy and other components
of the C.H. system has to ascertai-
ned.
gested to interpose between the boiler
and the system, a plate heat exchanger.
On the contrary, in case of installation of a
MODULEX on a new system we recom-
mend to make a simple water rinse of the
whole system and to fit a Y filter on the re-
turn pipe to the boiler, equipped with gate
valves.
BOILER HOUSE
FLOOR
1
5
0
1
5
0
INITIAL SIPHON
FILLING-UP PLUG
The upper part of the drain
pipe shall not be higher
than the tray bottom.
