© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 201s
E & OE Instructions Part number IN1115 Edition G8
13
The air shutter governing the air to the air wash system is
divided into two flaps. The larger flap is controlled directly
by the operation of the cam and air volume control. The
smaller flap is operated by an adjustable screw fitted to
the larger flap. This allows the smaller flap to follow the
movements of the larger flap as it opens and closes but
by adjusting the screw it is possible to set a minimum
closing position of the smaller flap to provide a constant
air bleed.
The screw is adjusted at the factory to give the maximum
air bleed setting. This setting under normal chimney and
fuel conditions should be correct.
This facility of having an adjustable minimum air setting
provides a positive repeatable air setting that will give
the lowest burning rate at which the stove will continue
burning when the firing rate control is turned to its
minimum position. It will also give a small feed to the air
wash when the stove is burning coal, not enough to risk
damage to the grate, but enough to help keep the glass
clean. It is also an important safety feature. If the stove
has been burning with a constant air supply it has been
generating and burning the volatile gases from the fuel.
If the air supply is abruptly and completely removed the
fire will extinguish but the release of gases will continue
for some time. These gases will be above their ignition
temperature and be potentially explosive if they come
into contact with air. The constant air bleed that the small
flap allows will keep some of these gases burning and
prevent sudden ignition whilst the generation of gases
reduces.
Adjustment
If it is found that the fire burns for only short periods
while set to the “0” position it will be most likely that the
flue draught is high. Commonly found in tall or excessive
sized chimneys.
To extend the burning cycle the minimum flap can be
adjusted to allow less air to enter at low settings. Adjust
the flap to give your required settings.
Important
Do not fully close the flap.
Minimum Air Setting
Minimum air
adjusting screw
Screw adjusted
to give a supply
of air when control
set to minimum
Small flap opens and
closes as rotation of
the cam operates
the large flap
The Flue
It is possible to remove the top chamber baffle to access the flue for cleaning. However we would advise that if
at all possible an external cleaning access is provided. If the chimney has been lined with the same size flue as
the flue pipe it will be possible to sweep from the flue access point. If the flue is of a larger size than the flue pipe
it may not be possible to use a sweeping brush of adequate size. In which case another cleaning access will be
required. For detailed information see IN1173 The Wood and Mutlifuel Chimney and Installation Guide.