E25 / E29
8
EN
cod. 3541M540 - Rev. 01 - 06/2017
Connection to multiple flues or single flues with natural draught
To connect the
E25 / E29
boiler to a multiple flue or a single flue with natural draught, the
flue or chimney must be expressly designed by professionally qualified technical person-
nel in conformity with the current standards and regulations.
In particular, flues and chimneys must:
•
Be sized according to the method of calculation given in the standard.
•
Be tight with respect to the products of combustion, resistant to the fumes and heat
and impermeable to condensate.
•
Have a circular or square cross-section (some hydraulically equivalent sections are
permissible), with a vertical progression and with no constrictions.
•
Have the ducts conveying the hot fumes at a suitable distance or separately from
combustible materials.
•
Be connected to just one unit per floor, for not more than 6 units (8 if there is a com-
pensation duct or opening).
•
Have no mechanical suction devices in the main ducts.
•
Be at low pressure, all along their length, in conditions of stationary operation.
•
Have at their base a collection chamber for solid materials or condensate, of at least
0.5 m, equipped with an airtight metal door.
3.7 Condensate drain connection
Installation
The boiler has an internal trap for draining condensate. Fit the inspection coupling
A
and
the hose
B
. Fill the trap with approx. 0.5 L of water and connect the hose to the disposal
system.
fig. 20
Condensate drain
The condensate should be run inside as far as is practicably possible. For that purpose,
use a pipe of at least 22 mm diameter and a trap with flexible connection supplied
with
the unit to facilitate connection of the condensate drain pipe.
The pipe must be in solvent weld plastic and not in copper, since the condensate has a
pH of 4 (slightly acid).
If the condensate drain pipe cannot be ended on the inside, it is advisable to run it outside
as shown in the following figure.
The pipe sections going to the outside are exposed to the risk of freezing in particularly
extreme weather conditions. To prevent this from occurring, it is advisable to reduce the
length of the condensate drain pipes and run them on the inside, as much as possible,
before going to the outside. It may also be necessary to insulate the condensate pipe or
apply a trace heating device to prevent freezing of the condensate.
The pipes outside the building must be in solvent weld plastic with increased diameter of
up to 32 or 40 mm with a maximum run of 3m for connection to a condensate collection
soakaway or external drain.
If using a condensate collection soakaway, it must be as indicated in the figure below, or
use a specific system (such as Mc Alpine SOAK1GR) available from the majority of
plumbing and heating suppliers.
fig. 21 - Condensate drain
A
B
0.5
litres
External
32/40mm Solvent weld pipework 2.5° Minimum fall. See below
Cement seal
100mm Dia tube
Bottom sealed
Lime stone chippings
Ground level
(either/Or)
Hole depth 400mm
25mm
2 Rows of
3x12 mm
Holes
Internal
-300mm
2.5° Minimum fall
