PART III: OPERATION
22
Fig. 1 - Burner front panel
Keys
B1
Lock-out LED
B2
Hi-flame operation LED
B3
Lo-flame operation LED
B4
“Ignition transformer operation” LED
B5
“Fan motor overload tripped” LED
G1
“EV2 opening” LED
G2
“EV1 opening” LED
G3
“Gas pressure switch signal ” LED
S1
Main switch
S3
Operation selector MAN - AUTO (operation in manual or automatic mode):
MIN = operation with minimum output
MAX = operation at the maximum output
A1
Burner Modulator (only on fully modulating burners)
A2
AZL..
Fig. 2
Gas operation
Check the gas feeding pressure is sufficient (signalling lamp
G3
on).
Burners fitted with gas proving system:
the gas proving system test begins; when the test is performed the proving system LED
turns on. At the end of the test, the burner staring cycle begins: in case of leakage in a valve, the gas proving system stops the bur-
ner and the lamp
B1
turns on.
NOTE:
if the burner is fitted with Dungs VPS504, the pre-purgue phase starts once the gas proving system is successfully performed.
Since the pre-purgue phase must be carried out with the maximum air rate, the control box drives the actuator opening and when the
maximum opening position is achieved, the pre-purge time counting starts.
At the end of the pre-purge time, the actuator drives the complete closing (ignition with gas position) and, as this is achieved the
ignition transformer is energised (LED
B4
is on); the gas valves open.
Few seconds after the valves opening, the transformer is de-energised and lamp
B4
turns off.
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
B2
on the frontal panel.
AIR FLOW AND FUEL ADJUSTMENT
WARNING! During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combustion
values are achieved.
WARNING! the combustion air excess must be adjusted according to the values in the following chart.
S1
B1
B2
B3
B4
B5
G1
G2
G3
S3
A1
A2
Summary of Contents for K750A
Page 1: ...M039462NB 0 1 11 2021 BURNERS BRUCIATORI BRULERS BRENNER QUEMADORES K750A K890A K990A...
Page 2: ...2 1 CO 2 a a RESET 3 3a...
Page 34: ...34...
Page 35: ......
Page 37: ...LME73 000Ax PME73 831AxBC LME73 831AxBC M12921NB Rel 1 2 02 2016...
Page 41: ...5 Info EK LME73 I LED EK LED 1 2 2 LED tw OFF OK OK T Led Led Led Led Led...
Page 42: ...6 1 515 1 259 01 0...
Page 43: ...7 2 515 1 259 01 0...
Page 48: ...12 2x 23 21 23 F A code Service OEM info enter Info Service enter reset ESC...
Page 49: ...13 Info LME73 Info Service...
Page 52: ...16...
Page 57: ...21 41 42 60 123 140 242 243 244 245 259 01 SO OEM LME73 831AxBC...
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