Yeoman YM-W9121FL, YM-W9122FL manual Over Firing, Burning Performance

OPERATING INSTRUCTIONS

7.OVER FIRING

7.1Do 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.

7.2If 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.

7.3Following 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.

7.4After 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.

8.2Fuel 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.

7