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NOTE:
A large amount of steam may condense on the inner surfaces of the boiler causing leakage of
water from the boiler combustion chamber door and from the combustion gas duct fin positioned
on the rear lower part of the boiler when the boiler is started for the first time. This event does
not influence operation and function of the boiler.
It is not recommended to open the boiler loading chamber door unless the combustion gas fan is
running and the start-up fin is closed, because volatile gases could be released from the chamber
and introduced into the surrounding atmosphere thus contaminating the boiler room.
Adjusting the air flow control thermal valve
6.5.
The thermostatic valve which controls the air flow is needed for an efficient combustion process which
must be adjusted so as to allow optimal operation of the boiler.
EXPLANATIONS: the fin actuated by the thermostatic valve must be open to guarantee a sufficient flow
of air for the start-up process until the nominal heat output is reached.
The thermostatic valve controls the air flow needed to obtain an efficient combustion process. This valve
closes the air control fin if the temperature of the circulating water has reached high levels consequently
preventing the boiler from overheating. This valve detects the temperature of the circulating water and
actuates the lever which controls the position of the air control fin - At low circulating water
temperatures, the lever opens the air control fin and conversely at high circulating water temperatures
the valve closes the air control find and consequently reduces the air flow for the combustion process,
thus reducing the heat output of the boiler. This thermostatic valve operates without any power supply
source. The position of the air control fin must be observed and manually adjusted by using the applied
chain.
CAUTION: the thermostatic valve must be regulated to close the air control fin when the circulating
water temperature reaches 90
Adjust the thermostatic valve as follows:
The boiler is heated to reach a circulating water temperature of 80
thermometer-pressure gauge).
Adjust the position of the thermostatic valve knob - The notch of the thermostatic valve must
correspond to the temperature of the water circulating in the boiler (operating temperature of 80
°C).
Adjust the chain (which connects the lever of the thermostatic valve and the air control fin) thus
modifying the position of the hook. The air control fin must be in the closed position. The chain must
be taut.
If needed, adjust the minimum position of the air control fin using the adjustment screw.
EXPLANATION: the air control fin must not seal the air opening otherwise it will "suffocate" the
combustion process and cause a large amount of tar to be deposited on the inner surfaces of the
boiler. The fin must be opened to 3-8 mm according to local conditions (chimney draught, heat
output of the boiler, fuel properties, etc.).
Start-up procedures
TECNIKA 28-35
USE AND INSTALLATION MANUAL
o
C.
o
C (measured by means of
Technical dept. - All rights reserved - Reproduction prohibited
Chapter
6
page 36
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