Air Supply And Flue Gas Discharge - A.O. Smith 28 30 50 60 Installation & Service Manual

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3.9 Air supply and flue
gas discharge
Release R.1.3 UK
4. Fit the gas supply pipe to the gas control.
Warning
Check for leaks after fitting.
Warning
The installation should be carried out by an authorised installer, in
compliance with the general and local regulations imposed by gas, water
supply and power supply companies and the fire service. Refer also to
paragraph '1.3 Regulations'.
Depending on the approved installation types, there are several alternatives
for connecting the air supply and flue gas discharge. The BFC appliances are
approved for installation types C13, C33, C43, C53 and C63.
The most common installation types are:
• C13: Concentric wall flue terminal
• C33: Concentric roof flue
This manual describes these installation types. If an explanation of other types
of installation is required, please contact A.O. Smith.
c
Note
A.O. Smith prescribes the use of a roof or wall-mounted terminal,
exclusively of a type approved for the appliance. See paragraph
'3.9.1 Concentric wall flue terminal'
Use of an incorrect roof or wall-mounted terminal can cause the installation
to malfunction.
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Remark
Make sure that the chimney discharges into an area where this is permitted
for this category of appliance.
Table 3.7 shows the maximum length of the chimney configurations. The
following requirements must also be fulfilled:
• the maximum chimney length is 15 metres.
• The maximum permitted number of 45° or 90° bends is four.
Table 3.7 Chimney configurations for concentric wall and roof
termination.
Dimension BFC 28
(1)
A 0-15 m
B 0-15 m
a + B max. 15 m
1. See 'Figure 3.4 Wall flue terminal'
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Note
If you make use of horizontal piping, then this must slope towards the
appliance with a minimum of 5 mm per metre running length!

Air supply and flue gas discharge

and
terminal.
and '3.9.2 Concentric roof flue
BFC 30 BFC 50
0-15 m 0-15 m
0-15 m 0-15 m
max. 15 m max. 15 m
and 'Figure 3.5 Roof flue terminal'.
terminal'.
BFC 60
0-15 m
0-15 m
max. 15 m
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