is

3.9.4Parallel connections

The table states the maximum pipe lengths for parallel systems. The maximum pipe length depends on the chosen diameter.

Warning

Install flue component pipe runs with a run-off of 5 mm per metre.

Flue gas outlet requirements for parallel systems

 

 

 

 

 

 

Appliance

Diameter1

Maximum

Lequivalent

Lequivalent

 

 

total length

90º bend

45º bend

BFC 28

80mm

25m

3.9m

1.1m

 

 

 

 

 

BFC 30

100mm

80m

4.6m

1.2m

 

 

 

 

 

BFC 50

100mm

45m

4.6m

1.2m

 

 

 

 

 

BFC 60

100mm

25m

4.6m

1.2m

 

 

 

 

 

BFC 28

100mm

100m

4.6m

1.2m

 

 

 

 

 

BFC 30

130mm

100m

2.4m

1.4m

 

 

 

 

 

BFC 50

130mm

100m

2.4m

1.4m

 

 

 

 

 

BFC 60

130mm

100m

2.4m

1.4m

 

 

 

 

 

1) Parallel systems with diameter of 130mm or 150mm. If the maximum total

length for a diameter of 130mm is insufficient, 150mm diameter must be used.

Any diameter enlargement must be carried out on both air supply and flue gas

outlet.

 

 

 

 

You must use the longest pipe when calculating the pipe length. For example, if the chimney pipe is 35 metres and the air supply pipe is 32 metres, use 35 metres as the length for the calculation. Next, add the Lequivalent for every 90° and 45° bend to this 35 metres, in both the air supply and flue gas outlet. The following practical example illustrates how to use the table.

Practical example of parallel flue gas outlet

Example

The diagram shows a BFC 30. This has to be fitted with a 25m parallel pipe 100mm in diameter, plus eight 90-degree bends. The configuration must be checked for compliance with the requirements stated in the table.

Instruction manual BFC

31

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A.O. Smith BFC - 30, BFC - 60 service manual Parallel connections, Practical example of parallel flue gas outlet

BFC - 30, BFC - 60 specifications

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