16
420010362200
Maior P 300.1/400.1 AB
EN
Once having installed the burner, check the following items:
- The burner power feeding and the main line protection fuses.- The correct length of pipes and that the same are sea-
led.- The type of fuel, which must be suitable for burner.- The connection of boiler’s thermostats and all the safeties.-
The motor rotation direction.- The correct calibration of the motor’s thermal protection.
When all the above mentioned conditions are checked and accomplished, it is possible to go on with burner’s tests.
Power the burner. The control box feeds the ignition transformer and the burner’s motor at the same time, which will
run a prepurging of the combustion chamber for about 20 sec.
At the end of prepurging, the control box opens the fuel pump and the 1st stage (Low flame) solenoid valves, the igni-
tion transformer produces a spark and the burner ignites. After a safety interval of 5 seconds and a correct ignition, the
control box turns off the ignition transformer and, 10 seconds later, sets the motorised air damper to its maximum ope-
ning and opens the 2nd stage solenoid valve (Maior 300) and 3rd stage solenoid valve (Maior 400) (High flame). In
case of faulty ignition, the control box switches the burner into safety condition. In such a case, the manual rearming of
the burner shall not take place before 30 seconds have elapsed from the burner’s safety shutdown. In order to obtain an
optimal combustion, it is necessary adjust the LOW - HIGH flame air flow, according to the instruction given further
on. During such a phase, it will be possible to manually switch between HIGH ( II ) and LOW ( I ) flame and vicever-
sa, through the High/Low flame switch. At the end of the adjusting phase, leave the switch in position II (HIGH
flame). The fuel pump feeding pressure, must remain around 12 bar.
START-UP AND ADJUSTMENT
I
nlet
end
return
G
1/2"
To
no
zz
le
G
1/2"
Pressure
gauge
port
G
1/4"
Vacuum
gauge
port
G
1/4"
40
20
30
35
10
15
25
5
1000
1200
1400
200
400
0
600
800
TA5
TA4
TA
3
TA2
0
900
1500
1100
1300
100
300
500
700
Genera
l
Mounting
Flange
mounting
Connection
threads
Cylindrical
according
to
I
SO
228/1
Shaft
Ø
12
mm
B
y-pass
plug
I
nserted
in
v
acuum
gauge
port
for
2
pipe
system;
to
be
remo
v
ed
with
a
3/16"
A
llen
key
for
1
pipe
system
W
eight
5,4
kg
(T
A
2)
-
5,7
kg
(T
A
3)
6
kg
(T
A
4)
-
6,4
kg
(T
A
5)
Hydrau
li
c
data
No
zz
le
pressure
ranges 30
:
7
-
30
bars
40
:
7
-
40
bars
Deli
v
ery
pressure
setting
30
bars
Operating
v
iscosity
4
-
450
cSt
Oil
temperature
0
-
140°C
max.
in
the
pump
I
nlet
pressure
light
oil
:
0,45
bars
max.
v
acuum
to
pre
v
ent
air
separation
from
oil
hea
v
y
oil
:
5
bars
max.
Return
pressure
light
oil
:
5
bars
max.
hea
v
y
oil
:
5
bars
max.
Rated
speed
3600
rpm
max.
Starting
tor
que
0,3
N.m
C
h
o
i
ce
o
f h
eater
Cartridge
Ø
12
mm
Fitting
according
to
D
I
N
40430,
NFC
68190
(N°9
elec.)
Rating
80-100
W
Data
shown
are
for
new
pumps,
with
no
allowance
for
wear.
Pump
capac
i
ty
Capacity
(
L
/h)
Viscosity
=
200
cSt
20
cSt
5
cSt -
Rated
speed
=
2850
rpm
Pressure
(bars)
2850
rpm