Sime Format System 25 HE Installation And Servicing Instructions page 9

2.6 SEPARATE DUCTS
(Optional alternative twin
pipe system)
A special kit may be used to separate the
flue gas outlet from the fresh air intake.
The intake may be installed to the right or
left of the flue gas outlet. Both ducts may be
oriented in any direction. Refer to fig. 7 for
positioning.
The maximum overall length of the intake
and exhaust ducts depends on the head
losses of the single fittings installed
(excluding the doublers) and must not be
greater than 13 mm H O.
2
For head losses in the fittings, refer to
Table 4.
NOTE: to use only special accessories for
condensing boilers.
2.6. 1 Separate pipe accessories
Kit code 8089907 is supplied for this pur-
pose (fig. 8).
TABLE 4
Accessories ø 80
90° elbow MF
45° elbow MF
Extension L. 1000 (horizontal)
Extension L. 1000 (vertical)
Outlet terminal
Inlet terminal
Doubler fitting
Roof outlet terminal L. 1 240
3 2
4
5
156,5
63,5
CA
CA
CS
3 1
Head loss (mm H O)
2
Inlet Outlet Roof outlet
0,30 0,40 –
0,20 0,30 –
0,20 0,30 –
0,30 0,20 –
– 0,30 –
0, 1 0 – –
0,20 – –
– – 0,50
KEY
CA Inlet
CS Outlet
KEY
1 Blind flange
2 Flue gas duct flange
3 Fixing screw
4 Gasket ø 125/95
5 Intake duct collar
Fig. 7
Fig. 8
7