HDG M299, Operation Manual

Page: 35 / 176

4 Planning and installation – Connections
35
the wall between the boiler room and the fuel storage should have a
width of 70 cm and height of 70 cm in order to allow the assembly of
the delivery auger.
V
ENTILATION OF FUEL STORAGE
ROOMS
Wood fuel products with higher moisture can cause relatively high
air humidity in the fuel storage. Cold surfaces may thereby
experience a drop below the dew point and develop condensation
water. This condensation water often occurs on non-insulated lids,
doors or cold walls and can result in a further moistening of the fuel.
It is therefore recommended to provide a suitable ventilation system
that corresponds to the building's features.
4.2 Connections
C
HIMNEY
The benefits of the HDG M299/300/350/400 can only be reaped if all
of the factors necessary for good combustion are carefully adjusted.
The heating system and chimney form a single functional unit and
must be adapted to one another in order to guarantee fault-free and
economical operation.
Since the flue gas temperature may lie below 100°C when the system
is under partial load, a chimney/flue is required which meets the
requirements of DIN EN 13384-1: 2003-03 “Thermal and fluid
dynamic calculation methods”. If it does not meet this standard,
contact your specialist heating company or chimney technician.
Another essential criterion is to achieve the correct flue draught. This
depends on three major factors.
C
HIMNEY CHARACTERISTICS
The requirements for minimising the draught loss in the chimney are:
• Good thermal insulation to avoid the flue gases cooling down too
quickly.
• Smooth interior surface to reduce the flow resistance.
Observe the requirements of the fire regulations for fuel storage
rooms.
According to EN 303-5, the entire flue system must be installed in
such a way that contamination, condensation and insufficient flue
draught are avoided. Here it is to be noted that, in the accessible
operational area of the boiler, flue gas temperatures of less than 160
K above room temperature may arise.
✎
The required flue gas values are listed in chapter “3 Mode of
operation”, section “3.3 Technical data”.
When planning the flue system, a flue calculation based on DIN EN
13384-1 must be performed by authorised specialists.