31
6.13.1 Coaxial duct (Ø 60/100mm and Ø 80/125mm)
Coaxial accessories
Description
Code
Ø 60/100 mm Ø 80/125 mm
Coaxial duct kit
8096250
8096253
Extension W. 1000 mm
8096150
8096171
Extension W. 500 mm
8096151
8096170
Vertical extension W. 140 mm with
smoke analysis take-off point
8086950
-
Adapter for Ø 80/125 mm
-
8093150
Additional 90° curve
8095850
8095870
Additional 45° curve
8095950
8095970
Tile with joint
8091300
8091300
Roof outlet terminal W. 1284 mm
8091205
8091205
Load loss - Equivalent lengths
Model
Leq (linear metres)
Ø 60/100 mm
Ø 80/125 mm
90° curve
1,5
2
45° curve
1
1
The smoke outlet and combustion air inlet can be built with sep-
arate ducts, instead of concentric ducts, using the “SEPARATE
DUCTS KIT”, product code 8089912 for Ø 80 mm or product code
8089913 for Ø 60 mm. The accessories must be ordered sepa-
rately from the boiler, and connected to the other accessories,
chosen from those listed in the table below.
Accessory 8089912 for Ø 80 mm is supplied with an
INLET DIA-
PHRAGM NOT TO BE USED
.
Accessory 8089913 for Ø 60 mm is supplied with an inlet collar
which must be replaced with the one on the boiler.
Minimum-Maximum Lengths
Model
Duct Length Ø 60/100
Duct Length Ø 80/125
W Hori-
zontal (m)
H Vertical
(m)
W Hori-
zontal (m)
H Vertical
(m)
Min. Max. Min. Max. Min. Max. Min. Max.
MURELLE
HT 25
-
4,5
1,3
6
-
8
1,2
10
MURELLE
HT 30
-
5
1,3
7
-
10
1,2
13
MURELLE
HT 35
-
4
1,3
6
-
8
1,2
11
Smoke outlet and combustion air inlet fittings
Ø 80
180
120
128
225
450
Fig. 43
6.13.2 Separate ducts (Ø 80mm - Ø 60mm)
The smoke outlet and combustion air inlet can be built with sep-
arate ducts, instead of concentric ducts, using the “SEPARATE
DUCTS KIT”, product code 8089912 for Ø 80 mm or product code
8089913 for Ø 60 mm. The accessories must be ordered sepa-
rately from the boiler, and connected to the other accessories,
chosen from those listed in the table below.
Accessory 8089912 for Ø 80 mm is supplied with an
INLET DIA-
PHRAGM NOT TO BE USED
.
Accessory 8089913 for Ø 60 mm is supplied with an inlet collar
which must be replaced with the one on the boiler.
Separate accessories
Description
Code
Diameter Ø
80 (mm)
Diameter Ø
60 (mm)
90° curve M-F (6 pieces)
8077450
-
90° curve M-F
-
8089921
90° curve M-F (with take-off point)
-
8089924
Extension W. 1000 mm (6 pieces)
8077351
-
Extension W. 1000 mm
-
8089920
Extension W. 500 mm (6 pieces)
8077350
-
Wall outlet terminal
8089501
8089541
Internal and external ring nut kit
8091500
8091510
Inlet terminal
8089500
8089540
45° curve M-F (6 pieces)
8077451
-
45° curve M-F
-
8089922
Manifold
8091400
8091400
Tile with joint
8091300
8091300
Roof outlet terminal W. 1381 mm
8091204
8091204
Reducer M-F Ø 60
-
8089923
Inlet/outlet fitting
8091401
8091401
Coaxial outlet Ø 80/125 L. 885 mm
8091210
8091210
Smoke outlet
The smoke outlet can be constructed by attaching the kit com-
ponents to the boiler fitting: the Ø125 seal (1), the collar (2) and
the screws (3) to fix everything in place. The reducer (4) only
comes in kit 8089913.
1
2
4
3
5
Fig. 44
m
CAUTION
MURELLE HT
boilers are provided as standard with a
steel diaphragm (5), code 6028607 for the
25
and
30
models, code 6028605 for the
35
models, which should
be positioned on the flue gas outlet flange when
the total load loss for the separate ducts is below 9
mmH
2
O. Where the total load loss exceeds 9 mmH
2
O,
do not use the diaphragm. The total load loss is de-
termined by the sum of the load losses of the single
accessories that make up the pipework. It should not
exceed 15 mmH
2
O.