11
FGi.FPi.FXi
Issue
12 10/17
6.3.
Air Controls
Keep air controls and inlets/outlets clean and free from ash or debris at all times. Keep
ventilator air inlet grilles (if fitted) clean and clear at all times.
Do not leave air controls fully open unless monitoring the fire as over firing damage (typically
buckling of components) can result which is not covered by any warranty.
Air Control Operation
6.3.1.
Primary air - under grate
The tab lever with a hole in it just below the main glass window controls the primary air supply
to the under grate area. The open position for the primary air slider should only be used for
smokeless fuel operations when it will control the burning rate and heat output. Take care not
to open it too far for too long as this can cause over-firing. Unless boosting a low fire bed or
your flue draught is very low it is not necessary to use primary air at all for wood burning – keep
it closed.
6.3.2.
Secondary Air - Air Wash
All Charlton & Jenrick stoves are provided with a sophisticated “air wash” system to assist in
keeping the fire as visible as possible and reducing (not eliminating) cleaning intervals. This
secondary air supply to the stove is controlled through the slider above the door. The Clean Air
Act air restrictor bracket will deliberately prevent full closure of this control. Set the secondary
air wash control only about 4mm open for briquetted smokeless fuels, opening it further will
just reduce efficiency. It may be opened almost fully (depending upon flue draught) for wood
burning if a high burn rate/heat output required. The closed position of the air wash control
should only be used if absolutely necessary for very slow burning and when burning wood will
cause the glass to become blackened, the chimney to gradually become tarred and smoke to be
emitted from the stove. This is not recommended.
6.3.3.
Wood burning:
Move the air wash slider fully to the right (open) for maximum air to start or revive a wood fire.
Returning the lever towards the centre position will reduce the air supply progressively to
reduce the burn rate. The nominal burn rate is usually achieved when the stove is fully warmed
up (2-3 loads of logs) and burning dry hardwood logs by having the lever very approximately 12-
15mm from the closed position. This is only a rough guide as flue and fuel conditions will vary
the required position. The maximum position will supply a boost of air to get new fuel burning
quickly in order to minimise smoke. Do not leave on maximum setting unless monitoring the fire
to ensure over firing damage does not occur. The fire will automatically be supplied with the
correct mix of tertiary air for complete combustion. NOTE: It is not normally necessary to open
the primary air at all once the stove is warmed up when burning wood unless the flue draught
or wood moisture are out of specification. Doing so may over fire the stove.
6.3.4.
Smokeless coal fuel burning:
Move the air wash control slider fully to the right side and open the primary air slider below the
glass panel fully for starting or reviving a coal fire. Returning the slider towards the closed
position will reduce the air supply progressively as the fire warms up. Do not leave any control
at maximum setting unless monitoring the fire to ensure over firing damage does not occur
NOTE: It is not necessary to open the secondary air slider more than 3-4mm once the stove is
warmed up when burning smokeless coals. Opening any further will keep the glass slightly
cleaner but will reduce thermal efficiency.
