Alpha CB Boiler Installation Instructions

Installation Instructions
90° and 45° Flue Bends
Concentric (60/100) Flue System
Kit Part No. 6.1000330

1. GENERAL

a. The flue system must be installed in accordance with BS 5440:1;1990.
b. The boiler must be installed in accordance with the Installation instructions supplied with the boiler.
c. Each 90° bend is equivalent to 1 metre of flue length.
Each 45° bend is equivalent to 0.5 metre of flue length.
d. For vertical flue applications refer to separate instructions.
e. For horizontal flue applications ensure that there is a slight downward slope towards the terminal.
f. Use the following methods to determine the correct length of horizontal flue required:-
For rear exit flue L = B + 175 mm
For side exit flue L = B + C + 185 mm (min. side clearance required is 5 mm)
Where L = Required length of flue
B = Finished wall thickness
C = Distance from inside wall to the side of the boiler, e.g. C = E + F
g. Note: For rear or side flue, cut a 110 mm diameter hole (or use a 107 mm core drill) in the wall is required for flue assembly.
h. Refer to the flue options and ensure the flue length does not exceed the maximum equivalent length of 4 metre, or
3 metre when fitted to an Alpha C23/27.
L = B + C + 185 mm
Front
Alpha CB/C/SY Boiler
Lmax = equivalent flue length of 4 m (except C23/27, Lmax = 3 m)
B
C
Fig. 1 - Horizontal side flue options
Kit Part No. 6.1000340
L = B + C + E + 185 mm
E
Front
B
C