baltur BTG 20 LX, Instructions For Use Manual

Page: 39 / 116

9 / 28
0006080937_2010/03
E
N
G
L
I
S
H
N° 0002934330
REV.:22/10/2004
MEASURING THE PRESSURE IN THE COMBUSTION CHAMBER
Pressure detection pipe connection nipple in combustion chamber
Pressure take-
off in
combustion
chamber
Burner flange
Pressure transmission pipe in com -
bustion chamber
If the hole in the door is too small to allow the hose to pass and the door has no flame inspection window it will be necessary to make a
Ø 12 hole at the site of the 1/4” connection for the insertion of the pressure take up hose in the combustion chamber (provided with the
burner).
Plate and refractory
wall hole to be drilled
to Ø 12
ELECTRICAL CONNECTIONS
The three-phase or single-phase power supply line of the suitable size
for the power absorbed by the burner (minimun section 1,5 mm2) must
be provided with fuse switch. In addition, according to the Standards,
a switch on the burner supply line is required, arranged outside the
boiler room in an easily reachable position.
All electrical lines must be protected with a flexible sheath, be firmly
fixed and pass far from high-temperature elements. See the diagrams
for the electrical connections (line and thermostats).
DESCRIPTION OF THE OPERATION
In the burner, by closing the main circuit breaker if the thermostats
are off, the control box is supplied. The fan motor is thus enabled,
and its operation determines the pre-ventilation of the combustion
chamber. At the same time, the combustion air damper control
motor opens the air damper in the position corresponding to the
maximum set.
The combustion chamber pre-ventilation step thus occurs with air
damper in the high flame position. At the end of the pre-ventilation
step, the combustion air damper is restored to the low flame posi -
tion. If the ventilation air pressure control switch detects a sufficient
pressure, the ignition transformer is started and the gas valves (main
and safety) are opened. The burner starts. The flame is thus present
and, detected by its control device, it allows continuing and ending
the ignition step by disabling the ignition transformer and enabling
the air damper control motor, which gradually sets the same to the
high flame position. The quantity of gas supplied with the high flame
must be regulated by operating on the air damper control servomotor
(see dr. n° 0002934320). In case of absence of ignition flame, the
control box stops in “safety lock”. In case of “safety lock” the valves
are closed immediately.
To unlock the control box from the safety position, press the luminous
button on the control box.
Note: For the gas valve regulation, see the specific instructions
in the following pages.
The air damper is actuated by a special electrical motor (see specific
instructions in the following pages), note that as the burner is shut
down by the thermostat enable, the air damper is restored to the
total closure position by the control motor.