baltur GI 350 DSPG Manual De Instrucciones página 40

Subsequently, control combustion with the appropriate in-
struments and modify, if necessary, the previous regulation
carried out by visual control only. The operation described
above should be repeated progressively (by moving forwards
the disk by about 12° at a time) and modifying every time, if
necessary, the fuel/air ratio during the entire modulation run.
Make sure that the increase in fuel delivery occurs gradually
and that maximum delivery is reached at the end of the
modulation run. This is necessary in order to ensure that
modulation functions with good graduality. The positions of
the screws that commend the fuel may need to be modified
in order to obtain the graduality required. Maximum delivery
is obtained when the return pressure is about 2 ÷ 3 bar less
than the delivery pressure (normally 20 ÷ 22 bar). For a correct
air/fuel ratio, the percentage of Carbon Dioxide (CO
increase with the increase in delivery (at least 10% at minimum
delivery to a maximum of 13% at maximum delivery).
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We advise against exceeding 13% of CO
with a rather limited excess of air which could cause a conside-
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rable increase in smoke opacity due to unavoidable circumstan-
ces (a variation in the atmospheric pressure, presence of dust
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particles in the fan's air ducts, etc.). Smoke opacity depends on
the type of fuel utilized (the most recent provisions indicate that
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it should not exceed N° 2 of the Bacharach Scale).
I We advise, if possible, maintaining smoke opacity below N°
2 of the Bacharach Scale, even if, as a consequence, the
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CO value is slightly lower. The lower smoke opacity dirties
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the boiler less and therefore its average yield is normally
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high even when the CO
remembered that, in order to regulate properly, the water in
the system should be at the right temperature and the burner
should have been operating for at least 15 minutes. If the
appropriate instruments are not available, judgement can be
based on the colour of the flame. We advise regulating in such
a way as to obtain a flame bright orange in colour.
Avoid a red flame with smoke in it, or a white flame with an
exaggerated excess of air. After having checked the air/fuel
regulation, tighten the locking screws of the adjustable screws.
19) The gas pressurestats (minimum and maximum pressure)
prevent the burner from operating when gas pressure is not
within planned range. Given the specific functions of these
pressurestats, it follows that the minimum pressure control
switch must utilize the contact that is closed when the switch
detects pressure higher than its own setting.
The maximum pressure control switch, on the other hand,
must utilize the contact that is closed when the switch detects
pressure lower than its own setting. Minimum and maximum
gas pressurestats must be set during burner testing, in rela-
tion to the pressure values detected from time to time. The
pressurestats are connected in series, therefore operation (i.e.
opening of the circuit) of either one of the switches does not
consent switch-on of the equipment. Correct gas pressurestat
operation must be checked during burner testing.
By using the adjustment devices, it can be verified whether the
pressurestat that must stop the burner (by opening the circuit)
effectively operates.
) should
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to avoid operating
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value is slightly inferior. It should be
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20) Control that the modulation motor functions automatically by
putting the AUT - O - MAN switch in the "AUT" position and
the MIN - O - MAX switch in the "O" position. In this way, mo-
dulation is activated exclusively by the automatic command
of the boiler's probe, if the burner is a GI...MM (modulating)
version, or on the command of the thermostat or pressure
switch of the 2nd stage, if the burner is a GI...DSPG (two
stage progressive) version. (See Chapter "Electronic Poten-
tiality Regulator RWF 40 for the modulating version).
Normally, it is not necessary to alter the internal settings of the
Potentiality Regulator RWF 40, however, the relative instruc-
tions are contained in the appropriate booklet.
21) Check the efficiency of the flame detection device (Photore-
sistant Cell). The photoresistant cell is a flame control device
and, if the flame should be extinguished during operations, it
must be capable of intervening (this control should be made at
least one minute after start up). The burner should be capable
of blocking itself (shut down), and remaining so, if the flame
does not appear regularly during the start up phase within the
time limit preset on the control box. The shut down causes an
immediate interception of the fuel, the burner comes to a stan-
dstill and the red warning light comes on. To check the efficiency
of the photoresistant cell and of the shut down system, proceed
as follows:
a) Start up the burner
b) after one minute, extract the photoresistant cell by pulling it
out of its seat and simulate flame failure with a dark cloth.
The flame should be extinguished and the control box will
repeat the ignition phase from the beginning and, immedia-
tely after the flame appears, it will go to shut down.
c) The control box can only be unblocked by pressing manually
on the appropriate pushbutton (unblocking).
To check the efficiency of the shut down device, carry out this
control at least twice.
22) Check the efficiency of the boiler's thermostats or pressure
switches (this operation should stop the burner).
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