Baxi Potterton LPG Service Manual download pdf (Page 25)

9.0 Plume Displacement

Concentric 60/100 Flue

60Ø Exhaust

Fig. 26

60 Ø Exhaust (metres) X

Concentric 60/100 Flue (metres) Y

34 65798

Fig. 27

60 Ø Exhaust (metres) X

Concentric 60/100 Flue (metres) Y

34 65798

60 Ø Exhaust (metres) X

Concentric 60/100 Flue (metres) Y

34 65798

Flue Length - Worked Example

Potterton Gold Combi 28HE

A LPG

In Fig. 27 opposite an additional 93° bend and pair of 45°

elbows have been included in the 60Ø exhaust.

Also 3 straight extension pieces have been used.

To calculate total length:-

Length of 60Ø supplied in kit = 1 metre

3 x 1 metre Extensions = 3 metres

1 x 93° Elbow = 1 metre

2 x 45° Elbow = 1 metre (0.5 metres each)

Total 60Ø = 6 metres

After consulting the table in Example 3 it can be determined

that the concentric flue could be up to approximately 2.3

metres long.

Concentric Flue

Support

Bracket

45° Elbow

93° Elbow

1 metre Extension

1 metre supplied in kit

Additional Accessories

A - 93° Elbow 5121369

B - 45° Elbow (Pair) 5121370

C - 1 metre 60Ø Extension 5121368

9.2 Determining Permissible Lengths

In the graph the solid line diagonal represents the

relationship between the concentric flue assembly (and any

extensions) and the 60Ø exhaust (and any extensions or

additional bends).

Example 1 - Not Permissible

If, for instance, a concentric length of 5 metres was required

and the 60Ø exhaust needed to be 6 metres the graph

shows that this combination would NOT be permissible as

the intersection point would be above the solid diagonal line.

Example 2 - Flue Lengths OK

Where both lengths have been determined they can be

applied to the graph to check that the installation is

permissible. For example, if it was known that 2 metres of

concentric flue and 4 metres of 60Ø exhaust were required,

the values could be applied to the graph as shown in

Example 2.. As the point of intersection of the dotted lines is

below the solid diagonal line, the combination of lengths is

shown to be acceptable.

Example 3 - Flue Lengths OK

In the example shown in Fig. 4 assume that the concentric

part of the flue needs to be 2.3 metres long. Find the

position of ‘2.3’ on the horizontal axis of the graph and then

project upwards to the solid diagonal line. This is represented

by the vertical thick dotted line. Where this dotted line

intersects with the solid diagonal line on the graph, project

across to the vertical axis. As can be seen this corresponds

with 6 metres. Therefore, the total equivalent length of the

60Ø exhaust can be up to 6 metres. Any bend equivalencies

must be accounted for i.e. 93° bends are equal to 1 metre,

each 45° bend to 0.5 metres.

Example 1

Flue Lengths - Not Permissible

Example 2

Flue Lengths - OK

Example 3

Flue Lengths - OK

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 59 60

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Baxi Potterton LPG Service Manual Page 25

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