Hsotram HK2, Manual

Page: 5 / 36

MANUAL
HK2 – HK4 25-08-2014
Page
5
1.1.1 Use of the heating boiler with storage tank (See page 3):
The HK boilers are wood log boilers, for
chopped wood having the same length as loading
chamber . The good performance links to the association of a minimum storage tank volume.
It is not a continuous fire like a stove. An essential characteristic of the boilers is the
presence of a suction fan situated in the flue gas exit on the back of the boilers.
The primary and secondary air leads to the combustion zone by ducts to obtain an ideal air
speed and mixture for ideal combustion.
The primary combustion air runs through the primary air valve (3) into the side of the lower
part of the loading chamber. The position of this valve adjusts the rate of air necessary to
generate the power.
The secondary air streams at high speed to the hot zone of the combustion by valve (4). It
enters through the ceramic slot (visible by the loading door) and diffuses through the
diffuser holes situated in the combustion air-mixing slot.
The combustion continues from the hot air-mixing slot into the combustion tunnel in which
the combustion finalizes at very high temperature (1000°C to 1200°C), thus minimizing
pollution and production of ash and optimizing the efficiency.
The best efficiency / combustion obtained by having a good control of the primary and
secondary air, according to characteristics of combustion (calorific power of the type of
wood, hygrometry and age). This implies that the fan works continuously when there is
wood in the boiler, and so that the boiler can permanently evacuate the energy produced by
the combustion. To obtain the correct way of working requires installing of a hydro-
accumulation volume with the correct dimensions (energy storage / storage tank).
The role of energy storages is to ensure good working of the boiler even when the energy
demand is weak (mild days of winter, autumn, spring, summer). It is a matter of absorbing
the surplus of energy produced by the boiler. This stored energy will be returned to the
heating system and in the domestic hot water according to demand. Thus,
when the storage
tank(s) are full of energy (75°C or 80°C at the lowest point) the boiler must be empty of
wood, must not be reloaded, and the suction fan will stop working
. The boiler will be
reloaded with wood when the storage tank(s) will be emptied of their energy (30°C to 40°C
at the highest point according to the type of installation, without active take over; 60°C at
the highest point with an active take over)
with only the necessary quantity of wood to
reheat the storage tank(s)
. It is possible to reload the boiler with wood before the storage
tank(s) become completely emptied of their energy (for example at night before going to
bed),
but loading only the quantity of wood necessary to reheat the storage tank(s).
So it is necessary to always consult the different thermometers of the storage tank(s) to
know the quantity of wood that you can load. This system supplies the energy with optimum
efficiency and a normal function, which ensures autonomy.
Thus this system allows the boiler running in the best conditions and avoids the slowing
down phases (the boiler in high temperature, boiler still loaded, very weak energetic
demand, suction fan stops). The slowing down provokes a bad function, an abnormal soot
build and premature use of the boiler by a corrosion due to the acids in the woods which
have not been burnt.
Therefore, it is vital never to reload the boiler when the storage
tank(s) are full of energy.
It is necessary to let the fire shut down if the storage tanks
discharging are long (weak energetic demand). HK boilers are not continual fire boilers .