C.I.B. UNIGAS
- M039203CC
27
Few seconds after the gas valves opening, the transformer is de-energised and lamp
L
turns off.
z
The burner is now operating, meanwhile the actuator goes to the high flame position and, after some seconds, the two-stage ope-
ration begins; the burner is driven automatically to high flame or low flame, according to the plant requirements.
Operation in high or low flame is signalled by lamp
N
on the frontal panel.
Light oil operation
z
The fan motor starts and the pre-purge phase as well. Since the pre-purge phase must be carried out at the maximum air rate, the
control box drives the actuator opening and when the maximum opening position is reached, the pre-purge time counting starts.
z
At the end of the pre-purge time, the actuator is in the light oil ignition position: the ignition transformer is energised (lamp
L
on).
Few seconds after the light oil valves opening, the transformer is de-energised and lamp
L
turns off.
z
The burner is now operating, meanwhile the actuator goes to the high flame position; after some seconds, the two-stage operation
begins; the burner is driven automatically to high flame or low flame, according to the plant requirements.
Operation in high or low flame is signalled by LED
N
on the burner control panel.
Modulating burners:
they are provided with the Siemens RWF40 modulator (
P
-see next picture). As for the modulator operation see
the related manual.
Fig. 27 - Burner control panel
Key
A
High flame mode indicating light
B
Low flame mode indicating light
C
Ignition transformer operation
CM
Main switch/operation mode Gas / Oil
D
Fan motor therma cutout intervention
E
Burner lockout indicating light
F
Stand-by mode indicating light
G
Gas valve EV1 operation
H
Gas valve EV2 operation
I
Gas pressure switch enabling signal
L
Oil solenoid valve operation
M
Gas proving system intervention
N
Control box reset pushbutton
O
Gas proving system reset pushbutton
P
Modulator
0
1
2
B
C
D
M
H
G
E
F
L
I
A
