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WD52/0/1997
boiler resistance must be added to the pressure loss caused by the rest of the
system and a pump selected that is capable of meeting the flow rate required at
the total pressure loss generated by the boiler and the rest of the system. The
selected pump must comply with BS 1394. It is important to note that the
minimum flow rate must be maintained whenever the boiler is firing. Systems
using zone valves must be specifically designed to only fire the boiler when the
pump is running and the minimum flow rate can be achieved.
2.8
FLUE SYSTEM
2.8.1
Design
Individual air supply and flue outlet pipes are used. The material used for flue
outlet &/or air inlet must be muPVC to BS 5255 an of an internal diameter of 51
mm. (ie nominal 50mm diameter muPVC solvent weld waste pipe)
80
Both flue outlet terminal and air inlet terminal are supplied and are illustrated in
Figure 2.8.1 above.
2.8.2
Maximum Lengths
The maximum lengths of both air inlet pipe and flue outlet pipe, when no bends
are used, are as detailed below.
Maximum Air Inlet Length
Maximum Flue Outlet Length
However, each bend used has an equivalent length that must be deducted from
the maximum straight length stated above. Knuckle bends must not be used.
A 92.5
Example:
Air inlet uses two one 92.5
(ie a+b in figure 2.8.2) = 15.0m - 1.0m - 1.0m = 13.0m
Flue outlet uses one 92.5
c+d in figure 7 = 15.0m - 1.0 m = 14.0m
Installation & Servicing Instructions
Chapter 2 - Boiler Connections
O56
40
Flue Outlet Terminal
o
sweep elbow is equivalent to 1.0m straight length.
o
The Keston 130 Condensing Boiler
211
Figure 2.8.1 : Terminals
:
:
o
sweep elbows. Hence, maximum length permissible
sweep elbow. Hence, maximum length permissible (ie
O83
O56
Air Intake Terminal
15.0 m
15.0 m
87
Page : 11
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