baltur TBML 80 MC, Инструкция по установке, использованию и обслуживанию

Страница: 73 / 104

DESCRIPTION OF OPERATION
WITH LIQUID FUEL
f
urtHer inStructionS to Start a mixed burner
It is not advisable to have too large a burner for the boiler for heating
and for hot water as the burner may work for long periods with a single
flame, making the boiler work at lower than required output; as a result
of this the combustion products (fumes) emerge at too low a tempe -
rature (at about 180°C in the case of heavy oil and 130°C with diesel
fuel), causing soot to build up at the chimney outlet.
IMPORTANT
When the boiler is working at lower output than that indicated by
the technicians, it is likely that acidic condensate and soot will
form in the boiler with the result that it will quickly corrode and
get clogged up.
When the two-flame burner is installed on a water boiler for heating
use, it must be connected so that it works normally with both flames,
completely stopping without passing to the first flame when the preset
temperature is reached.
To obtain this operating condition, do not install the second flame ther -
mostat and make a direct connection (bridge) between the respective
four pole plug terminals.
In this way, only the burner's capacity will be used for ignition at a
reduced flow rate for a soft start, which is an essential condition for
boilers with a pressurized combustion chamber, but also very useful for
normal boilers (vacuum combustion chamber). The burner's command
(on or off) is connected to the normal operating and safety thermostats.
The motor turns the fan that carries out an air wash of the combustion
chamber and, at the same time, the fuel pump that causes circulation
in the ducts, expelling any gas bubbles through the return valve. This
pre-washing phase ends with the opening of the operating solenoid
valves that makes it possible for the fuel to reach the nozzle and enter
the combustion chamber finely atomised.
As soon as the atomized fuel exits the nozzle, it is set on fire by the
spark present between the electrodes since the start of the motor.
If the flame appears regularly, after the safety time foreseen by the
equipment, it starts the air regulation servomotor that moves to the
2nd stage position. During the transition from the first to the second
stage, the equipment activates the solenoid valve (normally closed) of
the second stage.
The opening of the second stage valve allows the diesel to reach the
second nozzle and the burner to operate at full capacity.
From the time the flame appears in the combustion chamber, the bur -
ner is controlled by the photoelectric cell and thermostats.
The control equipment follows the program and switches the ignition
transformer off. When the temperature or the pressure in the boiler
reaches that set by the thermostat or pressure switch, the latter stops
the burner.
Subsequently, if the temperature of pressure decreases below the
lower thermostat or pressure switch threshold value, the burner will
switch on again.
If, for any reason, the flame is lost during burner operation, after just
one second the flame control device cuts off the power supply from the
relay, switching off the solenoid valves which intercept the fuel flow to
nozzles.
The equipment will shut-down automatically.
21 / 50
0006160331_202310
ENGLISH