36
INSTALLER
TAU UNIT
boilers are sealed boilers belonging to classes
C13, C23, C33, C43, C53, C63 and C83. The boiler room does
not therefore require air vents. The boiler room never-
theless does require safety vents for use with gas fuels
(METHANE and LPG).
Vents and intakes must be made in conformity to ap-
plicable national, regional, and local standards. (In Italy
refer to UNI - CIG 7129/92 standard).
The combustion gases are cooled to a temperature near
that of the central heating return before they leave the
boiler body. This makes it possible to use plastic flue
pipes instead of metal ones, with significant savings in
overall installation costs.
To protect the vent pipes against possible damage, TAU
UNIT boilers are equipped with a flue gas temperature
thermostat (as required by European standard EN 677).
9
Use of a high head fan allows twin flue pipes (in-
take and vent) to reach lengths of up to 40 metres .
9
Caution! Do not connect the vent flue directly to
existing flues used to serve other appliances (co-
okers, other boilers, etc.). Larger disused flues can
nevertheless be used as ducts for routing the boi-
ler’s intake and vent flues.
9
If the vertical section of vent flue is over 4 metres in
height, a condensate drain must be provided at its
bottom. This drain point must be connected to the
boiler’s own condensate collection tank described
in the "Draining the condensate" section.
9
The horizontal sections of the vent flue must slope
down to the boiler at a gradient of at least 3%.
9
Never connect two boilers to the same vent flue.
Each boiler must have its own dedicated vent flue.
2 .13
Flue gas vent and comburent air intake
C53
C33
C43
C13
C53
C13
C13
90°
45°
C13
Concentric wall vent. Twin flue
pipes can also be used, but the wall
through-pipes must be concentric or
located close enough to be subjected
to similar wind conditions.
C33
Concentric roof vent. Outlets as for C13.
C43
Vent and air intake via shared twin
pipes, subjected to similar wind
conditions.
C53
Separate wall or roof vent and air
intake, in areas of different pressure
9
In Italy, refer to Presidential Decree no. 412
and UNI CIG 7129 standard.
TWIN FLUES (Ø 80):
Pressure drop per 90°
curve = 0,8m
Pressure drop per 45°
curve = 0,5m
