Worcester Greenstar 80mm Flexi RF Flue, Руководство по установке, Страница: 6 / 16

Pre-Installation
Greenstar 80mm Flexi RF Flue – 6721814542 2019/09
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3.2 Chimney preparation
• The chimney must be swept if it has been previously used for an
appliance burning a fuel other than gas.
• It is recommended that the chimney be swept before installation of
the flexible flue.
• Any damper or restrictor plate in the chimney must be removed. If it
is not possible to remove the sliding damper it must be fixed
permanently in the open position.
• Any holes in the chimney must be sealed.
• The existing chimney pot and flaunching must be removed.
• The catchment space (void below the point of flue connection) must
be checked to ensure it complies with the flue to be installed.
• All debris must be cleared from the catchment space.
• To avoid debris falling into the air inlet duct, do not install the duct
with the open end facing up the chimney.
Only one appliance can be fitted to the flexible flue system.
3.3 Calculating the effective flue length
Table 8 Maximum flue length
To calculate the effective flue length:
▶ Check the flue path and consider the following;
– the number of 90° and 45° elbows required outside the chimney
– the number of bends in the flexible flue liner
▶ Deduct the effective length of each elbow from the maximum
horizontal length of 3 metres
Table 9 Elbow equivalent lengths
▶ Deduct the effective lengths of each bend from the maximum vertical
flue length (L
v
max) of 12 metres
Table 10 Bend equivalent length
Example of effective flue length calculation
The example in figure 5 shows the use of the flexible flue kit without
additional extensions or elbows.
Table 11 Example: Horizontal flue length
Table 12 Example: Vertical flue length
Fig. 5 Maximum flue length
Appliance variant Max flue length
vertical (L
v
max)
Max flue length
horizontal (L
h
max)
FS 30CDi 12m 3m
FS 42CDi 12m 3m
80/125mm elbow Effective length (m)
90° 2m
45° 1m
Bends in 80mm flexible liner Effective length (m)
45° 1.5m
Horizontal effective flue length (no
extensions or elbows) L
h
≤ L
h
max ?
L
h
= 1m L
h
max = 3m OK
Vertical effective flue length (with 2 x 45° bends) L
v
?
L
v
max = 12m - 2 x 45° bend = 3m - 9m
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