E
N
G
L
I
S
H
14 / 18
0006080304_201107
ting on the cam described in point 7) the air-flow to the quantity
needed to ensure good combustion. Combustion checks should
be carried out with special instruments. If suitable instruments
are unavailable observe the colour of the flame. We recommend
that you adjust to obtain a soft, light orange flame: avoid a red
flame that gives off smoke or a white flame with excess air. The
air regulator must be in a position which gives a percentage of
carbon dioxide (CO
2
) in the fumes that varies from a minimum
of 10% to a maximum of 13% with a smoke rating that does
not exceed standard limits (Bacharach scale). We recommend
that you adjust to obtain a soft, light orange flame: avoid a red
flame that gives off smoke or a white flam with excess air (see
also “Air adjustment on the combustion head”.
10) Adjustment of the preheater thermostats, minimum thermostat
and regulation thermostat (max) is effected by the manufacturer
and set at values which may, however, be unacceptable in
certain individual cases. It is therefore necessary, during final
testing, to check that these values do not cause problems
(poor combustion, smoke, formation of gas in the preheater,
etc.). Where necessary, increase or decrease the settings; bear
in mind that the regulation thermostat must nevertheless be
at a temperature approximately 15° higher than the minimum
thermostat setting. The minimum thermostat must close at the
minimum temperature needed to ensure that fuel arrives at the
nozzle with viscosity below 2° E. This condition is indispensable
for proper atomization. (As a rough guide see the viscosity-
temperature diagram regarding the employed oil type).
CHECKS
Once the burner is operating check the safety devices (photoresi-
stance, shutdown, thermostats).
1) The photoresistance is the flame control device. It must the-
refore cut in if, during operation, the flame goes out (carry out
this check at least 1 minute after flame ignition).
2) The burner must be capable of cutting out and staying cut out
if the flame does not appear during ignition as usual within a
certain amount of time set by the control device (5 seconds after
the closing of the washing electrovalve).Cut-out immediately
shuts down the burner and causes the cut-out light to come
on. Proceed as follows to check the efficiency of the photore-
sistance and the cut-out:
a) Start up the burner.
b) Wait at least one minute after ignition and then remove the
photoresistance, pulling it out of its housing, to simulate ab-
sence of flame and darkening of the photoresistance (blo-
cking off the window in the photoresistance support with a
cloth). The burner flame must go out.
c) Keep the photoresistance in the dark, and the burner will
come back on, but as the photoresistance does not detect
light, it will cut out within the amount of time determined by
the appliance programme. The appliance must be released
from cut-out manually.
3) To check thermostat efficiency run the burner until the water
in the boiler reaches a temperature of at least 50° C and then
act on the thermostat control knob, lowering the temperature
setting until the “click” of the opening switch is heard and
simultaneous burner shutdown is observed. The thermostat
must trip within a maximum “lag” of 5 - 10° C with respect to
the control thermostat (boiler thermometer). If this is not so
modify the thermostat scale calibration so that it corresponds
with thermometer settings.
ADJUSTING THE AIR ON THE COMBUSTION
HEAD
(see BT 8608/1)
The combustion head is equipped with a regulation device that
restricts (moves forwards) or opens up (moves backwards) the air
flow between the diffuser disc and the head. Closing the passageway
therefore generates high pressure upstream from the diffuser disc
even at low flow-rates Being at high speed and somewhat turbu-
lent, the air penetrates the fuel better, giving an excellent mix and
good flame stability. High air pressure upstream from the diffuser
disc may be necessary to prevent flame pulsation; this condition is
practically essential when the burner is working on a pressurized
chamber and/or at high thermal loads.
It is clear from the above description that the device which closes off
the air in the combustion head must be brought into a position which
always gives decidedly higher air pressure behind the diffuser disc.
It is recommended that adjustment be carried out to provide on-head
air closure that requires considerable opening of the air gate which
adjusts the burner fan intake flow; this condition must, of course,
be obtained when the burner is working at maximum desired fuel
flow-rates. In practice adjustment must be begun with the on-head
air closure device in an intermediate position and by igniting the
burner for approximate regulation as described previously.
When maximum desired fuel flow rates are reached correct the
position of the device which closes off combustion head air: do this
by shifting forwards or backwards so that an air flow compatible
with fuel flow is obtained with the air intake flap wide open. When
restricting air flow on the combustion head avoid complete closure.
Check for perfect centering with respect to the diffuser disc. Please
note that imperfect centering with respect to the diffuser disc may
lead to poor combustion and excessive heating of the head with
consequent rapid deterioration. Check by looking through the spy-
hole on the rear part of the burner and then tightening (all the way)
the screws that hold the combustion head air regulation device in
position.
N.B. Check that ignition occurs properly:
if the regulator has shifted forwards the high speed of the
outgoing air may make ignition difficult. Should such a situa-
tion occur shift the regulator back a little at a time until it is
in a position that gives regular ignition and take this as the
definitive setting.
It should be pointed out, once again, that for the 1st stage it is pre-
ferable to limit the air quantity to an indispensable minimum so as
to ensure secure ignition even under the most difficult conditions.
ADJUSTING THE DISTANCE BETWEEN THE DIF-
FUSER DISC AND THE NOZZLE
The burners are equipped with a device that allows adjustment of
the distance between the diffuser disc and the nozzle. The distance
between diffuser disc and nozzle is set by the manufacturer and must
only be reduced if it is noted that the atomized fuel cone exiting the
nozzle wets the diffuser disc and consequently stains it.
Summary of Contents for 20405420
Page 2: ......
Page 4: ......
Page 44: ...2 20 0006080304_201107 BALTUR a b c a b c d e f g...
Page 45: ...3 20 0006080304_201107 2 RC a b c d e a b a b c d...
Page 48: ...6 20 0006080304_201107 N 0002933330 1 2 3 4 5 6 7 1 2 3 4 5 45 6 7...
Page 49: ...7 20 0006080304_201107 35 1 5 5 50 30...
Page 54: ...20 0006080304_201107 25 1 12 5 20 1 2 1 1 27 27 27 25 p 2 18 1 1...
Page 56: ...20 0006080304_201107 1 2 L1 L2 L3 3 4 5 1 2 2800 6 7 8 BT 8608 1 BT 8605 1 a 45 1 2 2 1...
Page 57: ...20 0006080304_201107 3 4 5 2 1 6 1 2 7 2 8 2 9 2 7 CO2 10 13 6 Bacharach 10 15 2 1 2 5 a b...
Page 58: ...20 0006080304_201107 c 3 50 5 10 8608 1...
Page 59: ...20 0006080304_201107 0002930500 BT 8608 1...
Page 63: ...63 66 0006080304_201107 16A 16 14...
Page 65: ...65 66 0006080304_201107...