Rayburn Heatranger 480D, Installation Instructions Manual

The flue system must be installed to the regulations in
force.

Information

Maximum flue gas temperature 260

˚

C (Both burners on)

Minimum flue gas temperature 125

˚

C (Boiler burners on

only)
The appliance requires a minimum chimney draught of
1.0mm WG (0.04” WG) with both burners on.
Maximum chimney draught  6.0mm  (0.23” WG),
Draughts in excess of this will require a draught stabilizer
fitted either in the chimney or flue pipe and in the same
compartment.
Flue gas mass flow (both burners on) 125 Kgh

-1

.

Detailed recommendations for flueing in England &
Wales are given in Part J of the Building Regulations. For
Scotland in Technical Standard F to the Building
Standards and in Northern Ireland in Technical Booklet L
to the Building Regulations. Guidance is also given in BS
5410: Part 1.

Due to the range in flue gas temperatures a brick
chimney should be fitted with a suitable multi fuel
stainless steel flexible liner. Where it is necessary to
avoid condensation, such as an exposed end gable
insulation; such as vermiculite, should be back filled
between the flexible liner and the full length of the
brickwork.
Factory built chimneys must comply with the latest
edition of the Building Regulations and BS 4543: Part 3.

The cross-sectional area of the flue serving the appliance
must not be less than the equivalent area of 150mm
diameter flue pipe, and be at least 4.5m. high.
The flue pipe must not be less than 150mm internal
diameter. Flue pipes and fittings between the appliance
and the chimney should be constructed from one of the
following materials:  

a. Stainless Steel to BS 1449: Part 2
b. Cast Iron to BS 41
c. Mild Steel, acid resistant vitreous lined to BS 1344: Part

2.

NOTE: TO ACHIEVE THE OPTIMUM OPERATIONAL
SOUND LEVELS FROM THE APPLIANCE IT IS
RECOMMENDED THAT CAST IRON FLUE PIPE IS
USED WHERE POSSIBLE.

Chimneys

The chimney may also be constructed from 150mm
minimum diameter, moisture and acid resistant liners to
BS 1181 with rebated or socketed joints uppermost.
Alternatively, linings may be imperforate clay flue pipes
as described in BS 65 or flue blocks to BS 1269 and
installed to BS 5451: Part 1.

Chimney Termination

All chimneys should terminate at least 600mm above the
roof level in accordance with current Building Regulations
and statutory requirements as outlined in BS 5410: Part 1,
BS 6461: Part 1 and BS 7566 Parts 1 to 4.

Chimney Cleaning

Ensure there are accessible airtight flue cleaning doors in
order to obtain cleaning access to the complete chimney.
Providing the appliance is operating correctly, an annual
chimney flue cleaning will suffice, but if in doubt arrange
for a half yearly clean, preferably at the beginning of the
central heating season.

Site requirements

8

FLUE SYSTEM

FIG. 2

DESN 510521’A’