Unigas RG91, Manual Of Installation - Use - Maintenance, Page: 19 / 30

PART II: OPERATION
19
OPERATION

Turn the switch A on the burner control panel to the ON position.

Check the control box is not locked (LED B on), in this case press the reset button accessible from the upper side of the electrical
board (see next picture) or the pushbutton C on the frontal panel of the electrical board.

Check the thermostats (or pressure switches) enable the burner to operate.

The burner start up cycle begins: the contrl box activates the burner fan and meanwhile the ignition transformer (signalled by the
light H on the front panel); pre-purgephase lasts some seconds according to the control box type provided with the burner.

At the end of pre-purgue time, the first stage solenoid valve EV1 is energised, indicated by the LED D on the display panel and the
burner lights.

The ignition transformer remains on for some seconds after the flame is lit (post ignition time), after this time it is cut out and the
light H tunrs off.

The burner is on in the low flame stage (led G on); after 5 - 15 sec. (according to the control box type), it goes into the two-stage
mode and turns automatically to high flame or remains in low flame, according to the system demands. High or low flame opera-
tion is shown by the light F (high flame) or light G (low flame). The light E is on when the solenoid valve of the high flame is open,
feeding the nozzle of the second stage.
Burner control panel
Keys
A Main switch
B Burner lockout light
C Reset button for flame control device (only burners fitted with remote reset for flame control device)
D Signalling light of the opening of 1st stage solenoid valve
E Signalling light of the opening of 2nd stage solenoid valve
F High flame operation signalling light
G Low flame operation signalling light
H Ignition transformer in operation signalling light
I Overload tripped signalling light ( PG30 excluded)
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open. Be sure themains
switch is closed. Read carefully th “Warnings” chapter.
Fig. 10
F G H
I
B
E
D
C
A