pag.19
420010399600
MULTICALOR 170.1 -200.1 P AB
EN
OPERATION OF BURNER WITH GAS
Dual fuel gas/light-oil fuel burners must always be adjusted for light-oil as first ignition. After having installed the bur-
ner, check the following points: - Burner’s power and protection fuses. – Motors connections. – That pipe length is the
suitable one and relevant sealing. – That the fuel type is suitable for the burner. – Thermostats connections and the
safety devices. – The direction of motors rotation. – The correct adjustment of motors protections. – That the nozzles
flow rates are the suitable ones related to boiler’s output. Connect a manometer to the light-oil
pump. When all the above conditions are met, it is possible to proceed with the first ignition of
the burner. Switch on the burner. The control box powers the light-oil pump, as well as the
fan, thus starting the prepurging phase of the combustion chamber with the max. air flow rate.
At the end of prepurging, the air damper gear motor sets to the 1st light-oil stage (Low flame)
whilst the control box powers the ignition transformer and opens the safety and the 1st stage
solenoid valves. The burner ignites in Low flame. After a safety period of 3 seconds from the ignition, the transformer is
switched off and after 10 seconds the air damper gear motor sets the burner to High flame (2nd stage). In case of a
faulty ignition, the control box switches the burners to lockout safety condition within 3 seconds. In this case, the bur-
ner must be rearmed manually. In order to obtain the best combustion it is necessary to adjust the burner in both Low
and High flame stages, according to the instructions supplied with (air damper gear motor and firing head adjust-
ments). During this phase, it is possible to manually switch from Low flame to High flame and back through the
High/Low manual selector switch. At the end of the adjustment operations, set the selector to High position. For a cor-
rect adjustment of the burner, it will be necessary to carry out some combustion analyses at the chimney.
0
1
2
0 − STOP
1 − GASOLIO
2 − GAS
LIGHT-OIL
ADJUSTING THE COMBUSTION PROCESS
IMPORTANT:
to obtain the right adjustment of the combustion and thermal capacity it is important to analyze the
reducts of combustion with the aid of suitable instruments. The combustion and thermal capacity adjustment is done
simultaneously, together with the analysis of the products of combustion, making sure that the measured values are sui-
table and that they comply with current safety standards. On this matter, please refer to the table and figure below.
THESE OPERATIONS MUST BE DONE BY PROFESSIONALLY-QUALIFIED TECHNICIANS.
ECCESSO D'ARIA (%)
FATTORE D'ARIA
10
10
20
30
40 50 60
70
80
90
100
200
300 400
500
600
700
800
900
1000
2000
1,1
1,15
1,2
1,2
1,2
1,25
1,3
15
20
25
30
SUGGESTED REFERENCE VALUES
Natural Gas
CO
2
9,6%
CO
<100 ppm
EXCESS AIR (%)
AIR FACTOR
RATED USEFUL CAPACITY (KW)
M
Air
Gas
313
160
170
144
142
141
120
150
314
349
151
155
100
143
T
o
b
e
s
upp
li
ed
b
y
t
he
i
n
s
t
all
e
r
T
o
b
e
s
upp
li
ed
b
y
t
he
i
n
s
t
all
e
r
CONNECTION DIAGRAM FOR BURNERS WITH SEPARATE PILOT
(GAS TRAIN LANDIS VGD...)
107
100
B
u
r
ne
r
107
P
il
o
t
g
as
f
il
t
e
r/
g
o
v
e
r
no
r
120 Air
d
a
mp
e
r
141
B
all valv
e
142 Gas
f
il
t
e
r
143 A
n
t
ivi
b
ra
t
i
on
co
up
li
n
g
144 Gas
g
o
v
e
r
no
r
150
B
a
tt
e
r
f
l
y
valv
e
151 Gas
t
rai
n
La
nd
is
V
G
D
....
155
P
il
o
t
g
as
t
rai
n
160
Kit
t
i
g
h
t
ne
ss
con
t
r
o
l
(
o
pt
i
on
al)
170
Kit
t
i
g
h
t
ne
ss
con
t
r
o
l
f
o
r
p
il
o
t
g
as valv
e
(
o
pt
i
on
al)
313 Mi
n
.
g
as
p
r
e
ss
u
r
e
s
w
i
t
ch
314 Max
.
g
as
p
r
e
ss
u
r
e
s
w
i
t
ch
(
o
pt
i
on
al)
349 Air/
g
as
d
a
mp
e
r
m
o
t
o
r
CONNECTION DIAGRAM FOR BURNERS WITH SEPARATE PILOT
(gas train Landis VGD...)
100
Burner
107
Pilot gas filter/governor
120
Air damper
141
Ball valve
142
Gas filter
143
Antivibration coupling
144
Gas governor
150
Batterfly valve
151
Gas train Landis VGD....
155
Pilot gas train
160
Kit tightness control (optional)
170
Kit tightness control for pilot gas valve (optional)
313
Min.gas pressure switch
314
Max.gas pressure switch (optional)
349
Air/gas damper motor
