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on the internal surfaces of the boiler. The flap should be opened at
distance 3–8 mm, according to the local conditions (chimney’s draught,
thermal capacity of the boiler, fuel properties, etc);
EXPLANATION : the methodology of the adjustment of the thermovalve is
given in its user manual;
5.3.5.
Nominal operating mode of the boiler
After the process of boiler’s starting up (i.e. the fuel has been ignited, the
additional fuel has been fired-up, the boiler’s temperature has reached high
levels, the combustion process is stable and the circulating is circulating in the
heating system), the system should be tempered and then the system could be
considered in steady-state mode, as well as the hot water boiler. The adjustment
of the combustion process should be performed in this nominal operating mode
only. The operation of other control valves as well as other control modules
should be adjusted in this mode as well. At nominal operating conditions, the
circulating water temperature should be in the range of 65 – 85
o
C. The practice
shows that this mode is achieved after 1 to 2 hours after the boiler has been
started-up, however the local conditions and the heat consumption should be
accounted as well. In this mode the operating parameters the boiler should be
Figure
5.5.
Thermovalve
for
controlling the air flow rate for the
combustion process;
Handle of the thermovalve,
which controls the air flow rate
Air flow rate control flap
Chain, which connects the
thermovalve lever with the air
control flap
Minimal air flow rate screw