Fitting The Flue System; Flue Restrictors; Choice Of Flue - Biasi RIVA PLUS M90D.24S User Manual And Installation Instructions

Installation
6.7

Fitting the flue system

Refer to the assembly instructions contained with-
in the chosen flue kit packaging for the correct as-
sembly and installation.
6.8

Flue restrictors

Two restrictors with different size are supplied
with the boilers.
A 44 mm size is fitted to the boiler and a 47 mm
size is supplied in a separate bag.
For the correct use of the restrictors with co---axial
pipes ø 60/100 mm refer to Tab. 6.2.
For the correct use of the restrictors with vertical
roof kit ø 80/125 mm refer to Tab. 6.3.
For the correct use of the restrictors with twin
pipes refer to Fig. 6.8.
Equivalent length (ø 60/100)
Between 0,3 and 1 m
More than 1 m up to 2 m
More than 2 m up to 4 m
Tab. 6.2 FOR CO---AXIAL STANDARD FLUE
Equivalent length (ø 80/125)
Between 0,5 and 1,5 m
More than 1,5 m up to 6,5 m
More than 6,5 m up to 8,5 m
Tab. 6.3 FOR VERTICAL ROOF KIT
The appropriate restrictor, when necessary, must
be fitted in the flue outlet elbow as indicated in
Fig. 6.5.
Fig. 6.5
6.9
The following flue kits are available for connecting
to the boiler:
Standard horizontal flue kit (Fig. 6.6A)
Co--- axial 60/100mm --- nominal length 1m
This kit is normally supplied with the boiler and can
be fitted to allow discharge to the rear or either
side of the boiler via the flanged boiler adapter
elbow. Minimum length required is 0.3 m. Maxi-
mum equivalent length of 4 metres can be
achieved utilising extensions. This flue system can
only be used to discharge horizontally, it is not de-
signed to enable termination in the vertical plane.
Vertical kit with 90û elbow (Fig. 6.6B)
Co--- axial 60/100 mm
Supplied with a straight flanged adapter a co---
axial elbow and a co--- axial pipe with terminal, this
Restrictor
kit allows for a vertical rise of 0,5 m from the boiler.
In all circumstances the flue terminal must dis-
ø 44 mm
charge horizontally and the equivalent flue length
must not exceed 4 metres.
ø 47 mm
no restrictor
Elbows 45û & 90û (Fig. 6.6C)
Co--- axial 60/100mm.
Elbow kits enable the standard flue kits to be offset
to overcome obstructions or ensure the correct
Restrictor
clearances for the flue terminal. Each elbow used
in addition to the standard flanged elbow reduces
ø 44 mm
the overall acceptable length of the flue system as
ø 47 mm
follows:
no restrictor
45û reduce length by 0.5 m.
90û reduce length by 1 m.
ø 60/100
Fig. 6.6

Choice of flue

B
Min = 0,3 m
Max = 4 m
A
ø 60/100
90û=--- 1 m
45û=--- 0,5 m
C
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