Ø100mm
Ø80mm
STRAIGHT REDUCER
Ø80>Ø100
TEE WITH SEALING PLUG
DIRECTION
OF CLEANING
DIRECTION OF CLEANING
DIRECTION
OF CLEANING
TEE
TEE
INSULATING
MATERIAL
Max.
2m
(min.
3%)
Fig. 19
Fig. 20
Pipes and maximum usable lengths
Pipes of painted aluminium-clad steel (minimum thickness 1.5mm),
stainless steel (AISI 316) or enamelled steel (minimum thickness
0.5mm) with a nominal diameter of 80 or 100 mm (for pipes which run
inside the flue maximum diameter 150 mm) can be used.
The male-female connectors must have a minimum length of 50 mm.
The diameter of the pipes depends on the type of installation. The stove
was designed to take 80 mm diameter pipes but, as shown in Table
1, in some cases the use of double-lined 100 mm diameter pipes is
recommended.
TABLE 1 PIPE LENGTH
TYPE OF
INSTALLATION
WITH 80 mm
DIAMETER
PIPE
WITH DOUBLE-
WALLED 100 mm
DIAMETER PIPE
Maximum length
(with three 90° bends)
4.5 m
8 m
For installations more
than 1200m above sea
level
-
Required
Maximum number of
bends
3
4
Length of horizontal
sections with minimum
3% gradient
2 m
2 m
a
Losses in pressure associated with a 90° bend can be compared
to those incurred by one metre of pipe. An inspectable union-
tee can be considered equivalent to a 90° bend.
EXAMPLE:
if installing a section greater than 4.5 m in length with
80 mm diameter pipe, calculate the maximum usable length in the
following ways:
• If a maximum of
three 90° bends
are used, the maximum length of
the section will be
4.5 m
.
• If a maximum of
two 90° bends
are used and bearing in mind that a
90° bend can be replaced by one metre of pipe, the maximum length
of the section will be
4,5 m+1 m=5,5 m
.
• If a maximum of
one 90° bend
is used and bearing in mind that a 90°
bend can be replaced by one metre of pipe, the maximum length of
the section will be
4, 5m+1 m+1 m=6,5 m
.
Where 100 mm diameter pipe must be used, connect it to the stove flue
outlet with a 80 mm union-tee then use a 80 mm/100 mm adaptor (not
supplied by Piazzetta) (Fig. 19).
Union-tee
The use of this type of fitting must allow for the collection of condensate
mixed with soot, which builds up inside the pipe. It must also permit
periodic cleaning of the flue without the need to disassemble the pipes.
This type of fitting can be bought at Piazzetta retail outlets together with
the pipes.
An example is given below of a flueway connection, which allows
complete cleaning without having to disassemble the pipes (Fig. 20).
H07026300 / DT2000786 – 00
10
English
DT2030337-00
DT2030338-01
