25
code HG0141.00GB ed.A-2008
LRP - RAPID PRO and LK - KONDENSA
LRP and LK WARM AIR HEATER
5.4. Connections to the Flue
The LRP and LK heaters are fitted with a watertight combustion
circuit and with a fan located upstream of the heat exchanger.
Connection to the flue, according to where the heater is installed,
can be made as "C" type, with combustion air being drawn from
outside, or as "B" type with combustion air being drawn from
the heater installation site.
More specifically, the heater is certified for the following exhausts:
C13-C33-C43-C53-C63-B23-B23P.
EC-CERTIFIED pipes and terminals must be used.
The air intake and fume exhaust terminals must prevent access
to a sphere with a diameter higher than or equal to 12mm.
APEN GROUP can supply certified exhaust and intake
terminals, which can be purchased separately.
LRP and LK heaters are fitted as standards with horizontal fit
-
tings, chimney and air intake, placed at the back of the heater.
DURING
the installation, the fume exhaust and air intake fittings
can be moved to the top section; this is useful when fumes must
be exhausted through the roof.
On request, and according to the quantity, the heater can be
provided with fittings in the top section to fit a vertical exhaust.
To make the fume exhaust, taking into account that the heaters
are of a condensing type, the following material must be used:
•
Aluminium with a thickness higher than or equal to 1.5 mm;
•
Stainless steel with a thickness of at least 0.6 mm; steel
must have a carbon content of maximum 0.2%.
Pipes fitted with a seal must be used in order to prevent that
the fumes exit the pipes; the seal must be suitable to withstand
fume temperatures ranging between 70°C and 210°C for LRP
heaters and 25°C and 130°C for LK heaters.
ATTENTION: IT IS STRICTLY PROHIBITED TO USE
PLASTIC MATERIALS ON THE FUME EXHAUST DUCT.
For long fume exhaust pipe sections, it is recommended to
install a condensate drain before the heater inlet.
IMPORTANT: The horizontal sections of flue must be
installed with a slightly incline (1°- 3°) towards the heater,
in order to prevent the build up of condensation in the
exhaust.
Insulate the pipe if required to protect the flue from accidental
contact.
For the air intake, use:
•
Aluminium with a thickness higher than or equal to 1.0 mm;
•
Stainless steel with a thickness higher than or equal to
0.4 mm.
Selection Guide
The table showing the fume exhaust system calculation data
can be found in Paragraph 7.2 "Gas settings data table".
The maximum permitted recirculation percentage is 11%.
The tables below show the pressure drop for the most used
terminals and exhaust ducting.
If the terminal is not directly connected to the heater and,
therefore, extra routing is required, according to the length of
the ducting, the diameter of the selected terminals, extensions
and bends must be checked.
After establishing the routing, the pressure drop must be cal-
culated for each component by referring to the tables below
according to the LRP or LK heater used; each component has
a different pressure drop value as the glue gases flow rate is
different.
Add together the pressure drops of the single components,
checking that the result is not higher than the available value
for the heater to be used. If a combustion air supply pipe is
fitted, the pressure drops must be added to the fume exhaust
pressure drops.
If the sum of the pressure drops is higher than the available
pressure, ducting with higher diameter must be used, recheck-
ing the calculation; a pressure drop higher than the pressure
available at the fume exhaust reduces the heater heat output.
__________________________________________________
NOTE:
If the module is installed indoor:
•
the use of coaxial connections is allowed for heaters with
a maximum length of 3 metres;
•
the fume exhaust terminal must be installed in compliance
with reference national regulation requirements.
__________________________________________________
NOTE
: The following pictures show examples of fume exhausts
and air intakes that can be made by using the kits available
from our catalogue; the table shows the maximum length of the
section between the heater and the terminal. If the duct routing
requires the use of bends, their length must be subtracted from
the available length:
Bend Ø 80
90°
EqL 1.65 m
Bend Ø 80
45°
EqL 0.80 m
Bend Ø 100
90°
EqL 2.30 m
Bend Ø 100
45°
EqL 1.03 m
* Equivalent lengths valid for wide radius bends.
__________________________________________________
