Yeoman CL MILNER BRICK YMMB - Manual (Page 8)

8
USER INSTRUCTIONS
6. BURNING TIPS
6.1 Fuel Quality (Wood)
Use wood with a moisture content of less than 20%.
Seasoned logs have the bark beginning to lift and peel away
and cracks radiating from the centre. They feel lighter than
fresh cut wood of a similar size and sound hollow when
struck against each other. Logs should not feel damp or
have moss or fungal growths.
Symptoms related to wet wood:
—Difficulty starting and keeping a fire burning well.
—Smoke and small flames.
—Dirty glass and/or Firebricks.
—Rapid creosote build-up in the chimney.
—Low heat output.
—Short burn times, excessive fuel consumption and blue/
grey smoke from the chimney.
Burn at a high temperature for a short period each day
to avoid large build-ups of tars and creosotes within the
appliance and the flue system.
Use Yeoman Protector chimney cleaner to reduce this
problem.
6.2 Fuel Quality (Solid Fuel)
Use recommended solid fuels approved for use with closed
appliances.
Symptoms related to unsuitable fuels include:
—Difficulty starting and keeping a fire burning well.
—Smoke and small flames.
—Dirty glass and/or fire bricks.
—Short life span for grate, baffle and internal firebricks.
—Permanent staining of glass.
6.3 Air inlets puffing smoke
Combustion gases can build up in the firebox and ignite
as small explosions, causing smoke to puff out of the air
inlets and other openings. This occurs if the air controls
are shut soon after adding new fuel to a very hot fire. Stop
by opening the air controls to increase combustion air and
burning rate.
CAUTION: Shutting down a hot appliance shortly after
refuelling, and before the fire is established, could result
in poor combustion. This may lead to a build up of
unburned gases which could ignite noisily and, in extreme
circumstances, cause a small explosion and may damage
the appliance. Always maintain flames in the firebox when
there is new fuel in the appliance - This is particularly
important when burning solid mineral fuels.
6.4 Flue Draught
The chimney has two main functions:
1) To safely remove the smoke, gases and fumes from the
house.
2) To provide a sufficient amount of draught (suction) in the
appliance ensuring the fire keeps burning.
Draught is caused by the rising hot air in the chimney when
the appliance is lit.
Symptoms of poor performance related to flue draught
include:
—Excessive fuel consumption (high flue draught).
—Poor burning control and/or 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 are opened (low flue
draught).
The construction, position, size and height of the chimney
all affect the performance of the flue draught.
Other factors effecting the flue draught include:
—Nearby trees or buildings causing turbulence.
—Outside temperature.
—Outside weather conditions.
—Incorrect additional ventilation to building.
—Blocked flue or chimney.
For advice on the correction of persistent flue problems
consult a qualified heating engineer before continuing to
use the appliance.
6.5 Weather conditions
The weather conditions outside the building can effect the
burning performance of the appliance. These could include:
Weather Conditions Problem Effect
Windy days Buildings/obstacles
cause turbulent air
around chimney
Smoky appliance
Calm days Oversized chimney Smoky appliance
Damp / Rainy days Flue temperature
not hot enough /
rain water inside
chimney
Lighting and
burning problems
To reduce these problems:
—Use good quality kindling wood to start the fire.
—Burn initially at a high temperature for a short period.
—Fit a rain cowl to the chimney.
Your installer should advise you on possible solutions.
If the appliance emits smoke into the room continuously:
—Close the air controls and allow the appliance to go out.
—Ventilate the room to clear the fumes.
Do not re-light the appliance until the problem is solved.