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INDUSTRIE
3.02 Restrictor
For boiler operation, the restrictor supplied with the unit must be mounted following the instructions below.
Determine the correct size of flue restrictor required. Before inserting the flue gas duct in the boiler, check that the restrictor
fitted is correct and that it is correctly positioned (see fig. 14).
Holes Ø : 45 47 50
CHOICE OF RESTRICTOR:
• With 2 pipe system:
- Calculate the total flow resistance of the air and
flue pipes in metres (cap. 3.08.2)
- utilise the table shown below to choose the more
suitable restrictor for the flow resistance calculated
R
R
R
R
S E
S E
S E
S E
T
T
T
T
R
R
R
R
C I
C I
C I
C I
T
T
T
T
O
O
O
O
R
R
R
R
F
F
F
F
O
O
O
O
R
R
R
R
R
S E
T
R
C I
T
O
R
F
O
R
T
T
T
T
o
o
o
o
a t
a t
a t
a t
f l
f l
f l
f l
o l
o l
o l
o l
w
w
w
w
r
r
r
r
s e
s e
s e
s e
s i
s i
s i
s i
a t
a t
a t
a t
T
o
a t
f l
o l
w
r
s e
s i
a t
o
o
o
o
o
f f
f f
f f
f f
f f
u l
u l
u l
u l
u l
e
e
e
e
e
s
s
s
s
s
s y
s y
s y
s y
s y
e t
e t
e t
e t
e t
m
m
m
m
m
m
i
i n
m
u
m
m
a
i x
0
m
1
1
3
m
2
2
3
m
3
3
8
m
4
14
T
T
T
T
W
W
W
W
O
O
O
O
P
P
P
P
P I
P I
P I
P I
E
E
E
E
S
S
S
S
Y
Y
Y
Y
S
S
S
S
T
T
T
T
E
E
E
E
M
M
M
M
T
W
O
P
P I
E
S
Y
S
T
E
M
n
n
n
n
e c
e c
e c
e c
U
U
U
U
e s
e s
e s
e s
r
r
r
r
s e
s e
s e
s e
i r t
i r t
i r t
i r t
t c
t c
t c
t c
r o
r o
r o
r o
n
e c
U
e s
r
s e
i r t
t c
r o
i s e z
i s e z
i s e z
i s e z
i s
e z
m
u
m
m
m
3
m
4
5
3
m
4
7
8
m
5
0
8
m
N
o
r
s e
i r t
t c
r o
FALCON
N.B.: the diameter of the hole is stamped on
the restrictor
Boiler is fitted with Ø45 restrictor as
standard
Fig. 14
• With concentric systems:
- Choose correct restrictor from table below.
R
R
R
R
R
S E
S E
S E
S E
S E
T
T
T
T
T
R
R
R
R
R
C I
C I
C I
C I
C I
T
T
T
T
T
O
O
O
O
O
R
R
R
R
R
F
F
F
F
F
O
O
O
O
O
F
F
F
F
F
u l
u l
u l
u l
u l
e
e
e
e
e
e l
e l
e l
e l
e l
n
n
n
n
n
g
g
g
g
g
t h
t h
t h
t h
t h
1
b
e
C
o
n
e c
n
r t
c i
6
0
/
1
0
0
1
b
e
1
b
e
C
o
n
e c
n
r t
c i
1
b
e
8
0
/
1
2
5
1
b
e
R
R
R
R
R
C
C
C
C
C
O
O
O
O
O
N
N
N
N
N
C
C
C
C
C
E
E
E
E
E
N
N
N
N
N
T
T
T
T
T
R
R
R
R
R
C I
C I
C I
C I
C I
S
S
S
S
S
Y
Y
Y
Y
Y
S
S
S
S
S
T
T
T
T
T
E
E
E
E
E
M
M
M
M
M
U e s
U e s
U e s
U
U e s
e s
u
u
u
u
u
p
p
p
p
p
t
t
t
t
t
: o
: o
: o
: o
: o
r
r
r
r
r
s e
s e
s e
s e
s e
i r t
i r t
i r t
i r t
i r t
t c
t c
t c
t c
t c
r o
r o
r o
r o
r o
i s
i s e z
i s e z
i s e z
i s e z
e z
n
d
+
1
m
t e
r e
5
0
m
m
n
d
+
3
m
e
e t
s r
N
o
r
s e
i r t
t c
n
d
+
3
m
t e
r e
4
5
m
m
n
d
+
4
m
e
e t
s r
5
0
m
m
n
d
+
5
m
e
e t
s r
N
o
r
s e
i r t
t c
r o
r o
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