Yeoman YM-W9122FL - Manual (Page 7)

7
OPERATING INSTRUCTIONS
7. OVER FIRING
7.1 Do not use the appliance at maximum output for prolonged
periods of time, or over fill the firebox with fuel, as this
could result in over-firing. If the connecting fluepipe,
appliance flue collar or top plate glow red with heat the
appliance is being over fired and the air controls should be
closed to reduce the output.
7.2 If a chimney fire occurs shut all air controls immediately to
close the appliance down, and evacuate all persons from
the building before calling the fire brigade. Do not re-enter
the building until it is confirmed safe to do so.
7.3 Following a chimney fire do not use the appliance until it
is inspected by a HETAS (GB only)/INFO (Eire only)
registered installer, to confirm that the appliance is safe
to use, or make any repairs required before re-use. Only
genuine Yeoman replacement parts are to be used to keep
your appliance in safe and efficient working order.
7.4 After any chimney fire it is recommended that the chimney
system be inspected and swept by a NACS registered (UK
only) chimney sweep, to confirm that the system is
structurally sound and free from any obstructions before
re-use.
8. BURNING PERFORMANCE
8.1 Fuel Quality (Wood)
Use only seasoned wood with a moisture content of less
than 20%. Well seasoned logs should have the bark
beginning to lift and peel away, along with deep cracks
radiating from the centre of the log. Logs should feel lighter
than fresh cut wood of a similar size and sound hollow
when struck against each other. Logs should not feel damp
to the touch, have any visible moisture oozing from them
or moss and fungal growths on them.
Symptoms of poor performance related to wet woods
include:
• Difficulty getting a fire going and keeping it burning well,
• Smoky fires with little flame,
• Dirty glass,
• Dirty firebricks,
• Rapid creosote build-up in the chimney,
• Low heat output,
• Short burn times, excessive fuel consumption and blue/
• grey smoke from the chimney.
8.2 Fuel Quality (Solid Fuel)
Use only recommended solid fuels, which are approved for
use with closed appliances. Symptoms of poor performance
related to unsuitable fuels include:
• Difficulty getting a fire going and keeping it burning well,
• Smoky fires with little flame,
• Dirty glass,
• Dirty firebricks,
• Short life span for grate, baffles and internal firebricks,
• Permanent staining of glass.
8.3 Backpuffing
This is caused by a lack of combustion air entering the
firebox causing combustion gases to build up in the firebox
and periodically ignite as small explosions, causing smoke to
puff out of the appliance air inlets and other openings. The
problem will often occur if the air controls are shut soon
after adding new fuel to a very hot fire. To stop backpuffing
occurring open the air controls to increase the combustion
air and increase the burning rate.
8.4 Flue draught
The chimney has two main functions, which are, to safely
remove the smoke, gases and fumes from the house, and to
provide a sufficient amount of draught (suction) in the
Yeoman stove to ensure that the fire is kept burning.
Draught is caused by the rising hot air in the chimney when
the Yeoman stove is lit.
Symptoms of poor performance related to flue draught
include:
• Excessive fuel consumption (high flue draught)
• Poor burning control, overheating (high flue draught)
• Wind noise from air controls (high flue draught)
• Difficulty getting a fire going and keeping it burning well
• (low flue draught)
• Low heat output (low flue draught)
• Smoke entering room when doors opened (low flue
• draught)
The construction, position, size and height of the chimney
are all factors that affect the performance of the flue
draught.
Other factors that can effect the flue draught include:
• Trees or other buildings nearby causing turbulence
• High and gusty winds
• Outside temperature
• Outside weather conditions
• Incorrect additional ventilation to building
• Blocked flue / chimney
For advice on the correction of persistent flue problems
consult a qualified solid fuel heating engineer before
continuing to use the Yeoman stove.
8.5 Weather conditions
The weather conditions outside the building could have an
effect on the burning performance of the Yeoman stove.
These could include:
Windy days - Smoking from the appliance. This could be
caused by turbulent airflow around chimney terminal,
possibly caused by the position of other buildings or
obstacles nearby. This problem is, also, sometimes
associated with oversize chimneys, which may even have
downdraught problems on calm days. If smoking is a
common problem on windy days make a note of the wind
strength and direction before consulting your appliance
installer, who will advise you on possible solutions to the
problem, after visiting the installation.