20
TECHNICAL PASSPORT, INSTALLATION AND MAINTENANCE INSTRUCTION
9
RISK ASSESSMENT
9.1
HEAT HAZARDS
Touching hot elements of boiler can cause burns.
Boiler’s surface area, which heats up
to 40 °C and other parts are thermally isolated given the technical possibilities, but there are
other parts such as door handles which get even hotter and are dangerous to humans.
Such places are marked with an international hazard sign. After hydraulic test, hot water
pipes of the heating system must be thermally insulated.
9.2
PRESSURE HAZARDS
Pressure can get higher: in case of power loss when circulation pump stops working, boiler
is not filled with cold water from heating system and temperature rises to the critical point,
then draft regulator is turned on, closing the valve at the selected temperature, causing the air
to not be supplied and extinguishing the boiler
. Water in boiler won’t boil because firewood is
extinguished fairly quickly as there is only one layer burning. If air inlet valve is damaged or
because of other breaches of exploitation rules (for example, ash removal doors are left open)
the water inside the boiler can begin to boil. Therefore, safety valve (Fig. 9) of 1,5 bar must be
used; it is mounted at the top of boiler, next to the flue (see 6.2; 6.3; 6.4 in connection
diagrams). According to Figure 10 we recommend connecting gravity-controlled radiator (a
radiator without thermos-valve). Hot water goes through balance tap (bk1) (Fig. 10) to the
nearest radiator which can work in gravity circulation mode so that in case of power loss the
boiler would be protected from overheating. (bk1)
– safety gravity circulating radiator
balancing tap must be such that radiator return pipe would be 40 °C colder than supply pipe.
9.3
POSSIBILITY OF POISONING
When flue is clogged up or when cleaning ashes, carbon monoxide can accumulate in
the boiler room, therefore natural ventilation with air pull is needed, air inlet ventilation is
needed for it to work
– it can be an opening or open window in outer wall of the building. If
there is no inlet ventilation, boiler will not work. So,
don’t forget about inlet ventilation in
boiler room, this ventilation must be directly connected to the outside. Boiler room doors
must be shut tightly, so that when kitchen ventilations or compulsory connection nodes are
turned on, work of the boiler would not be interfered with and dust or carbon monoxide
would not be able to get into the living quarters.
9.4
ELECTRICAL CONNECTION REQUIREMENTS
Circulation pumps that are installed in the system use electric energy. They must be
connected by a qualified electrician that has permission for the job.
Possible effect of electric current on human beings.
Electrical installation must be carried out according to governmental requirements.
