baltur TBML 80 MC User Instructions page 61

stage.
• The gas control pressure switch (minimum) prevents burner
operation when gas pressure is not the foreseen one. The
minimum pressure switch must make use of the contact which
is closed when the pressure switch detects a pressure higher
than its own setting. Therefore the adjustment of the minimum
pressure switch must be carried out when the burner is started
up, in accordance with the pressure that is found from time to
time. The triggering (opening of the circuit) of any of the pressure
switches when the burner is running (flame on) causes the
burner to stop immediately. When first switching on the burner
it is essential to check that it works properly.
Once the adjusting operations are completed, visually check
that the thin plate on which the bearing acts has a progressive
profile. Using the special instruments check also that in the
passage from the 1 to the 2
st
do not move too much away from the optimal values.
UV PHOTOCELL
Even the slightest greasiness will compromise the passage of the
ultraviolet rays through the UV photocell bulb, thus preventing the
sensitive internal element from receiving the quantity of radiation
necessary for it to work properly. If the bulb is fouled with diesel fuel,
fuel oil, etc., it must be properly cleaned.
Even by simply touching the bulb with fingers, it is possible
to leave a slight greasiness which could compromise UV
photocell operation.
The UV cell does not detect daylight or the light from a common
lamp. Sensitivity can be checked with a flame (cigarette lighter,
candle) or with the electric discharge between the electrodes of a
common ignition transformer.
To ensure proper operation, the UV cell current value should be
sufficiently stable and should not drop below the minimum value
required by the specific equipment; this value is indicated in the
wiring diagram. It may be necessary to search for the best position
by sliding (axial or rotational movement) the casing that contains the
photocell with respect to the fastening clamp. This can be checked
by connecting a micro-ammeter, with a suitable scale, in series to
one of the two UV photocell connection cables. Obviously the polarity
(+ and -) must be respected.
LME 73... equipment needs a cell current between 200 and 500
microA.
CHECKS
• After starting up the burner, check the safety devices (flame
detector, lock-out system, thermostats).
• The flame control device should trip if the flame extinguishes
during operation (this check should be made after at least 1
minute after ignition).
• The burner should be capable of blocking itself and remain
so when a normal flame does not come on during start-up
cycle and within the pre-set on control box. The lock-out
causes the immediate stop of the motor and burner and the
switching on of the corresponding lock-out light indication.
To check the efficiency of the flame detector and lock-out system,
stage combustion parameters
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proceed as follows:
- Start the burner.
- After at least one minute, remove the flame detector from its
housing and simulate flame failure. (use a rag to close the
specific opening on the flame detector). The burner flame
should go to out. The burner goes into lock-out within the
time pre-set by the program. The equipment can be reset
only manually by pressing the specific button.
• 3) To check thermostat efficiency, make the burner work
until the water inside the boiler reaches a temperature
of at least 50°C. Then, use the thermostat control
knob to reduce the temperature until you perceive an
opening click and the burner stopping at the same time.
The thermostat tripping should occur with a deviation of 5 ÷ 10
°C with respect to the control thermometer (boiler thermometer).
Alternatively, change the setting of the thermostat scale making
it correspond to that of the thermometer.