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the surrounding atmosphere and the boiler’s room could be
contaminated with gases as well;
5.3.4.
Adjustment of the air flow rate control thermovalve
The thermovalve, which controls the air flow rate, required for efficient
combustion process, should be adjusted in order to allow optimal operation of
the boiler. EXPLANATION : until the nominal thermal capacity of the boiler
is reached, the flap, driven by that thermovalve should be opened, in order to
ensure sufficient air flow for the ignition process.
This thermovalve controls the air flow rate, required for achieving efficient
combustion process. This valve closes the air control flap in case the
temperature of the circulating water has reached high levels and thus
preserves the boiler from overheating. This valve senses the temperature of
the circulating water and actuates a lever, which controls the position of the
air control flap – at low temperatures of the circulating water this lever opens
the air control flap, in reverse, at high temperatures of the circulating water
the lever of the valve closes the air control flap and reduces the air flow rate
for the combustion process, thus reduces the thermal capacity of the boiler.
This thermovalve is functioning without any energy sources – it is
proportionally driven and its lever turns linearly by changing the temperature.
The position of the air control flap should be observed visually and adjusted
manually with the applied chain.
ATTENTION: the thermovalve should be adjusted in order to get closed the
air control flap when the temperature of the circulating water has reached
90
o
C
Adjustment of the thermovalve should be done in the following way:
•
The boiler is heated-up, until the temperature of the circulating water has
reached 80
o
C (measured by the thermo-manometer, installed on the front
plate of the control box of the boiler);
•
Adjust the position of the handle of the thermovalve – the signature of the
thermovalve should be equal with the temperature of the circulating water
in the boiler;
•
Adjust the applied chain (which connects the lever of the thermovalve
with the air control flap) by changing the position of the hook, the
position of the air control flap should be opened. The chain should be
strained;
•
If necessary – adjust the minimal position of the opening of the air control
flap – use the adjustment screw. EXPLANATION: the air control flap
should not close tight the air orifice, because this will lead to
“suffocation” of the combustion process and intensive tar depositioning
