Top Outlet: Two Pipe Flue System; Two Pipe Connection; Notes On Two Pipe System Installation; Two Pipe Ue System - Ferroli MODENA 80 E Installation, Servicing And User Instructions Manual

3.04 Top Outlet: Two Pipe Flue System

3.04.1 Two pipe connection

Two separate ducts Ø80 for air intake and fl ue gas discharge
can be directly connected to the boiler. For conversion to top
outlet (see 3.03) mount the separate outlet kit "1"
Connect fl ue duct to central hole Ø80 and air duct to left or right air intake hole Ø80. Insert blanking plate "2"
in remaining air intake. A wide number of accessories for two pipe systems are available from Ferroli (ref. to
page 17). Before installing your system please check via calculation table at 3.04.2 you are not exceeding the
maximum permissible length for the appliance.
otes on two pipe system installation:
hen using the two pipe system the fl ue discharge pipe must have a 2 mm air gap when passing through combustible
materials. here the fl ue discharge pipe passes through the airing space of an airing cupboard it must be protected
by a non combustible guard or expanded metal giving an annular air gap of at least 2 mm.
here the fl ue discharge pipe passes through a wall containing cavity insulation a non combustible sleeve must be
tted. Additionally a gap of 2 mm between the sleeve and the insulation should be provided by cutting back the
insulation or packing loose ll bead insulation with mineral bre.
space it should be insulated with non combustible insulating material to prevent condensation. The fl ue pipe should be
supported at intervals of not more than 1.8m and the support should be preferably below a oint.

3.04.2 Two pipe ue system

alculating ma imum permissible ue lengt .
The calculation method is based on a standard reference parameter (1 metre of horizontal air fl ue 80 diameter
80) for the maximum length permissible for all the pipes + ttings fl ow resistance coef cient. In other words for
all components and pipes in the different installation con gurations (vertical or horizontal air or fl ue etc.) and
for all the ttings a fl ow resistance (reduction) equivalent to
For every boiler model a maximum pipe length is provided expressed in
way to calculate the length of a proposed 2 pipe air fl ue system add the fl ow resistance (reduction) in equivalent
metres air. For every component and tting present in the system and to check that the total is less than the
maximum length the permissible for the boiler model.
: the pipes a d fi tti gs fl ow resista ce (reductio ) have bee summarised o the followi g pages.
The fl ow resista ce values writte refer o ly to Ferroli pipes a d fi tti gs.
alculation routine
1. tilise the pipes and ttings fl ows resistance tables on the following pages and calculate the total fl ow
resistance in metres air by adding the fl ow resistances of the components in the whole air fl ue system based
on their position (vertical or horizontal air inlet or fl ue outlet).
lease note that the same tting identi ed by a one code (i.e. 1 pipe diameter 80 code
different fl ow resistances if positioned as air inlet or fl ue outlet if placed vertically or horizontally.
T e ow resistance o t e special two pipe ue air a apters o not a e to be inclu e in t e calculation
as t ey are alrea y inclu e in t e ma imum lengt calculation.
2. For the restrictors please refer to cap. 3.02 to determinate the correct diaphragm.
3. Check that the total fl ow resistance calculated is less or equal to 48 metre the maximum permissible
for odena 80 .
16
Insert blanking plate 2
in remaining air intake
2
Fig. 19
here the fl ue pipe is run through an unheated roof
metre of horizontal air induction pipe is indicated.
Ø80 Ø80
FLUE AIR
metres of horizontal air pipe. In this
A83A) can offer
1