Publication No. 5102977
8
1.5
Flue Systems
A flue system (lined throughout its length) must be
provided to evacuate the flue products of combustion
from the boiler. Reference should be made to the
building regulations and BS 5440:1. and the flue
system efficiency should be checked in accordance
with BS 5440.
Ideally a flue should rise vertically and any terminal or
termination point shall be positioned so that combustion
products can disperse safely at all times. Therefore
for practical purposes, the flue should have the shortest
possible run to external atmosphere, with as near
vertical rise as possible, 90° bends should be avoided.
The terminal must be at least above roof level and of
a type approved by British Gas.
To achieve the best perfomance from the boiler there
should be at least 600 mm of vertical flue from the
boiler flue socket. If this is not achievable, a 125 mm
flue size should be used irrespective of the boiler size.
Horizontal runs should be avoided, however if a near
horizontal flue run is unavoidable, the total vertical
height necessary should be calculated in accordance
with BS 5440:1.
If an existing chimney is used, ensure that it is
thoroughly swept before lining or connecting the
boiler. The liner must have an internal diameter of
100mm for the 40 to 60 models and 125mm for the 70
to 100 models.
Care should be taken to avoid condensation in the
flue.
In the case of a pre-lined chimney, it must be connected
to the socket of the boiler flue hood with a length of
purpose made flue.
Where flue size is to be determined by calculation, the
following information should be used
Next Section is 1.6 The System.
Installation Requirements
Fig. 4
Model
Size
40
50
60
70
80
90
100
Mass Rate of Combustion
Products (g/sec)
10.19
11.30
13.58
14.88
15.90
16.55
17.59
Average
Temp. (°C)
108
117
130
135
144
156
165
Seal
Liner
Approved
Terminal
Cement
Seal
Sealing
Plate
Set Into
Chimney
Pre-lined Flue
Seal
CO
N
0
0
1
1C
Purpose
Made
Flue
Purpose
Made Flue
Summary of Contents for Kingfisher Mf CFL40 - 100
Page 13: ...Publication No 5102977 13 CON0093B Installation Requirements Fig 8 Fig 7 ...
Page 14: ...Publication No 5102977 14 Installation Requirements Fig 9 Fig 10 ...
Page 31: ...Publication No 5102977 31 Fig 30 Pictorial Wiring Diagram CON0082B T T B CFL Models Only ...
Page 34: ...Publication No 5102977 34 Fault Finding ...
