Alpha CD Installation Instruction

Installation Instructions

CD Ridge Flue Terminal Assembly

(Kit Part No. 6.2000530 - Copper Brown colour)

(Kit Part No. 6.2000540 - Grey Brown colour)

Only for use with an Alpha CD/HE Condensing Boiler

with an Alpha CD Concentric (60/100) Flue System

KIT CONTENTS

1. GENERAL

Note: The CD Ridge flue terminal MUST ONLY be used with an Alpha CD or HE condensing boiler.

a. The flue system must be installed in accordance with BS 5440:1.

b. The boiler must be installed in accordance with the Installation instructions supplied with the CD/HE boiler.

c. The Ridge flue terminal assembly is equivalent to a 3 m length of flue.

d. Each 45° bend is equivalent to a 0.9 m length of flue.

Note: It is recommended not to use a 90° bend with the vertical flue.

e. Refer to the vertical flue options (Fig. 1) and ensure the flue length does not exceed the equivalent of 15 m for a

CD boiler (including the terminal assembly) or 6 m for an HE boiler (including the terminal assembly).

f. Additional flue lengths of 0.75 m and 1.0 m are available for extending the flue up to the maximum equivalent flue

length.

g. To determine the actual length of flue required, measure the distance from the top of the boiler side panel to the

ridge position (H) and subtract approximately 350 mm for the terminal assembly (see Fig. 1).

h. The Ridge flue terminal has been designed predominantly for use in new build situations where roof construction

allows the terminal to be accomodated without alterations to the roof structure.

In retrofit installations roofing materials will need to be removed/replaced and the roof structure may require
alterations to accommodate the passage of the flue system.

Note: Any work of this nature should be carried out by a competent person and the integrity of the roof structure
should never be compromised.

i. The Ridge flue terminal replaces a 450 mm ridge tile. Positioning at the ridge should be in accordance with the

current Building Regulations. Cut any roofing felt/boarding as necessary to allow for the entry of the throat
section of the terminal (50 mm) to pass directly into the roof space. A clearance of 25 mm from combustible
materials must be maintained.

j. New Build and Dry Fix Systems - There are many different proprietary dry fix and ventilated ridge systems and the

profile of the Ridge terminal is suitable for use with most forms of universal ridge tile.

Where pre-formed connections are used to mechanically fix the ridge tiles, it will be necessary to determine from the
end profile of the Ridge terminal if these are suitable. It will be necessary to trim the end profile of the terminal to
match the connector profile. Place a connector onto both ends of the terminal and install at the nominated position
between rafters.

Removal of the mortar bedding tray will be necessary if ventilation sections are used at the intersection of the ridge
tile and roof slope.

If the Ridge flue terminal is not compatible with the roofing connectors supplied, securely fix the Ridge flue terminal
to the roof structure using the fixing ties supplied and apply 'shoulders' of flexible mortar, e.g. Flexim, to either side
of the unit. Adjacent ridge tiles can then be bedded into the mortar or the adjacent roofing connectors can be
adapted to suit the situation.

Always ensure joints are fully sealed and the integrity of the roofing system is maintained.

H Max = CD 12 m

HE 3 m

Note: Always remove the flue restrictor when using the Alpha HE boiler

H Max = CD 10.2 m

HE 1.2 m

Fig. 1

Ridge Flue Terminal Kit - 2