Operation - Unigas TP90A Installation, User's, And Maintenance Manual

OPERATION

ATTENTION: before starting the burner up, be sure that the manual shutoff valves are open and check that the pres-
sure value upstream the gas train matches the value on paragraph "Technical specifications"). Check that the
mains switch is closed.
Turn to the "ON" position the main switch A, on the burner's control panel (see Fig. 34).
Check the flame control device is not locked (light B, on) and eventually release it by means of the pushbutton C (reset - for more
information about the device, please refer to the manual's Appendix).
Check the series of thermostats or pressure switches gives the burner the start signal for operating.
Check that the gas pressure in the gas network is sufficient (if the pressure is normal, the lamp E lights).
The check cycle of the gas proving system starts; the end of this check is signalled by the lamp on the device (see pag. 25). To
unlock the system, press the reset pushbutton on the gas proving system.
The fan motor starts, the servocontrol drives the air damper to the maximum opening position (light G on); the pre-purge time coun-
tdown starts now (30 seconds).
At the end of the pre-purgue time, the air damper moves to the ignition position (about 5°), the ignition transformer is energized
(light I on), the solenoid gas valves EV1 and EV2 are energized (lights L and M).
The flame must appear within 3 seconds after the gas valves opening, the transformer is de-energized and the light I is turned off.
The burner is now operating and at the same time the servocontrol moves to the hi-flame position (90° - see pag. 26).
24 seconds after the gas valves opening, the burner starts the automatic operation: it works in high or low-flame operation (for pro-
gressive PR- burners) or in the phase requested by the burner modulator (Fully modulating - MD buners) according to the require-
ments of the plant.
G
H
C
Fig. 34: Burner's electrical board front panel
B
O
I
N
L
E
M
F
D
CIB UNIGAS - M039177CA
P
A
35
Key
A Main switch
B Lock-out light
C Reset pushbutton for control box
D Reset pushbutton for gas proving system
(only for burners provided with Siemens
LDU11)
E Gas pressure switch consent
F Lock-out light for gas proving system
G Hi-flame operation light
H Lo-flame operation light
I Ignition transformer operation light
L EV2 opening light
M EV1 opening light
N Fan motor overload tripped light
O Burner in stand-by light
P Burner Modulator (only on fully modula-
ting burners)