Stovax 7118 - Manual (Page 7)

7
9.4 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
Stockton stove to ensure that the fire is kept burning.
Draught is caused by the rising hot air in the chimney when
the Stockton 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 Stockton stove.
9.5 Weather conditions
The weather conditions outside the building could have an
effect on the burning performance of the Stockton 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.
damp / Rainy days – These sometimes result in problems
when lighting and maintaining the fire, due to the lower
flue temperatures and smaller difference between indoor
and outdoor temperatures reducing the flue draught. Also,
rain water running down the inside of the chimney reduces
the flue temperatures. To help with this problem care must
be taken to use good quality kindling wood, when starting
the fire, and running the stove at a higher heat setting than
normal for a period after start-up to fully heat the chimney.
It could be possible to fit a rain cowl to the chimney to
reduce this problem. Your appliance installer should advise
you on possible solutions.
If the Stockton stove emits smoke into the room
continuously close the air controls and allow the stove to go
out, and ventilate the room to clear the fumes.
do not re-light the appliance until the cause of the
problem is identified and rectified.
SToVe GlASS BlACKeNING:
This occurs as a result of four possible causes:
A. Burning unseasoned wood – See page 8 (section 10.1) for
more information on how to identify when your wood is
ready for burning. Properly seasoned logs will have been
kept for a minimum of a year but are best burnt at  years.
B. The stove being burned at too low a temperature - A
good working temperature is 00-500° F (10 – 50° C).
A stove pipe thermometer will help identify this problem.
(Stovax part no 046). Burning the stove with the airwash
control fully open for a period of around 0 minutes ought
to cure this. This might be caused by damping your stove
down overnight.
C. Problems with your flue – in particular insufficient air pull.
If your flue is not doing its job efficiently this can cause
blackening of the glass. A flue which is too short,
experiences a downdraft, needs lining or has too many
bends can promote blackening. If you suspect your flue
may be contributing to the blackening of your stove glass
you should contact the installer or a flue specialist.
RIddlING MeCHANISM JAMMING:
This occurs when fine ash builds up under the riddling
mechanism preventing their movement. To prevent this we
recommend that you follow a regular cleaning routine for
the inside of your stove, taking care to lift out the riddling
mechanism and remove all ash. Replace riddling grate when
cleaning is complete.
SToVe GlASS CRACKING:
Please ensure when replacing the glass in your stove that
you do not over tighten the screws on the glass clips as this
will cause stress in the glass and with the intense heating
and cooling of burning your stove it may well cause the
glass to crack.
oPeRATING INSTRUCTIoNS
10. TRoUBleSHooTING