48
Radijator Inženjering d.o.o, 36000 Kraljevo, Živojina Lazića - Solunca br.6, Srbija
tel. +381 36 399 140, fax. +381 36 399 150, http://www.radijator.rs
e-mail: radijator@radijator.rs
3.2. Safety measures and safety devices of the CUBA water pellet stove
For the safe operation of the CUBA stove, the following elements are installed and it is
necessary to keep them functional.:
The safety pressure valve;
The automatic air vent;
The electro-mechanical air pressure switch;
The flue gas pressure switch;
Thermoregulators in automatic controls which regulate the operation of the water
pellet stove.
Picture 2. Safety valve Picture 3. Air vent Picture 4. Thermomanometer
The safety pressure valve (Picture 2) is already factory-installed to the water pellet
stove and it has a nominal diameter of ½ col, calibrated to the maximum value of 3
bars. Belonging to a group of pressure limiters, this safety element has to be
constructed in such a way to endure short-term trespassing of both temperature and
pressure, as well as to contain a certain amount of glycol in the liquid used for
heating. Discharging or exhausting or part of the safety valve (if the user wants to
install it) has to be made from the pipe which has a diameter at least equal to the
nominal diameter of the exhausting part of the valve. It is also allowed to use no more
than a single arch in the radius of r > 3d.
The safety valve has to have a label and the following information on it:
the manufacturer’s name;
the safety valve’s type tag /year of inspection tag;
the nominal flow;
information saying what thermal output the safety valve is set to;
the highest relief pressure, that is 3 bars.
It is mandatory to inspect the operational functionality in certain periods and to have
recalibration done by the certified companies. These obligations are conducted in
accordance with the law of each country where the boiler is assembled. It is
mandatory to keep the written document containing information on the last calibration
of the safety valve.
The automatic air vent (Picture 3) has to be installed on the highest point of the boiler
and directly without any piping or any other elements between. For this purpose, there
is a specially designed outlet. It is strictly forbidden to reduce this outlet’s diameter in
any way during the maintenance and installation of a new one.
Installing the manometer to the hydraulic installation (Picture 4) is also
recommended.
The one which is not factory-installed.