19
Important :
when cutting the flue hole and when
extending the flue centre line to a side wall
remember that the flue system must have a fall of
about 35 mm per metre of flue DOWNWARD from
the boiler. There must NEVER be an upward incline.
From the back of the boiler, loosen the screws
holding the two flue connector clamps (
diag. 31
)
and slide them away from flue outlet.
Remove straight flue connector and fit elbow (
E
)
into rear of the boiler, fitting flush end of elbow into
position and tighten screws, see
diag. 32
.
REAR OUTLET FLUE ASSEMBLY
Diagram. 29
E
F
D
C
B
A
234
50
mini
29
60
255 mini
Diagram. 30
Cutting the flue hole
Making allowance for the slope of the flue, cut
the hole in the external wall, preferably using a
115 mm diameter core drill. If necessary, make
good at both the inner and outer surface of the
wall.
Important :
before cutting the hole for flues directly
to the rear of the boiler, always cover the fixing jig
to make sure it is not damaged.
Calculation of flue cutting lengths
Measure the wall thickness
e
(mm).
For side flues, measure distance from inside face
of the side wall to the centre line of the boiler and
subtract 205 mm to get dimension
a
(mm), see
diagram 33
or
34
.
Diagram 32
Diagram 31
Diagram 33
Diagram 34
e
a
X
e
a
X
Pho 025
Pho 086
Pho 026
Ins 012a
Hab 208
Hab 209
