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7.2. PRESSURE HAZARDS
Increase of pressure is possible: when electric power fails and circular pump stops, the boiler is not
refilled with cold water from a system and temperature reaches the dangerous level then the draught
regulator gets actuated by closing a valve at the set temperature mode, not letting air in and extinguishing
the boiler. Temperature can reach the critical level of 100° C from inertia but water will not boil in the
boiler since thanks to a combustion method a small layer of burning firewood logs upon an automatic
closure of the air valve quickly goes down. If the air closing valve is deformed or due to other violations
of operation rules (for instance, the door from ash cleaning is open) water in the boiler can start boiling.
However the pressure protection valve mounted on the upper pipe of the feeding flow near the boiler
easily releases vapor and does not exceed pressure, allows the boiler to get replenished with water from a
reversionary water flow pipe from a system and to cool down.
Under improper use: for instance though the air is injected through a lower door into the boiler due
to the intensive combustion in the boiler its capacity is exceeded several times so the boiler can boil water
and if overheated crack up from normal pressure.
The boiler can also crack up from too high pressure, if a pressure protection valve of higher pressure
will be mounted in an improper place or clogged. As calculations and practice prove the boiler will never
explode to the outside but crack up inside therefore there is no hazard for human health or life.
7.3.
POSSIBLE INTOXICATION
When the chimney flue is clogged or when cleaning from ash, carbon black monoxide can be
formed in a boiler room therefore natural exhaust ventilation is required and for its operation the influent
ventilation is required too, i.e. the opening or opened small window in the outside wall of a boiler room. If
there is no influent ventilation the boiler shall not operate. Therefore do not forget to install the inflowing
ventilation in the boiler wall of a boiler room directly from outside. The door of a boiler room must be
tightly closed so that when an emergency sanitary unit or kitchen ventilation are switched on the operation
of the boiler shall not be disturbed and dust or carbon black monoxide shall not pass from a boiler room
into residential rooms.
7.4. REQUIREMENTS FOR CONNECTING OF ELECTRIC PARTS
Circular pumps are fitted in the system using electric power. They must be connected by a person
who has a qualification of an electrician and permission for such work. Fitting works must be performed
according to the prepared design (considering general input capacity). Influence of electric power on
human is possible! Electric power connections must be insulated, bodies earthed, installation performed
according to the standards valid in the state.
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