PART III: OPERATION
23
Adjustments - brief description
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam respec-
tively.
Check that the combustion parameters are in the suggested limits.
.Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a
differential pressure gauge.
Then, adjust the combustion values corresponding to the points between maximum and minimum: set the shape of the adjusting
cam foil. The adjusting cam sets the air/gas ratio in those points, regulating the opening-closing of the throttle gas valve.
Set, now, the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increasing
too much or that the flues temperature gets too low to cause condensation in the chimney.
ADJUSTMENTS FOR GAS OPERATION
Adjustments - brief description
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the valves group
pressure stabiliser respectively.
Check that the combustion parameters are in the suggested limits.
Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a
differential pressure gauge, as described on par. “Measuring the gas pressure in the combustion head”.
Then, adjust the combustion values corresponding to the points between maximum and minimum (progressive -fully modulating
burners only): set the shape of the adjusting cam foil. The adjusting cam sets the air/gas ratio in those points, regulating the
opening-closing of the air damper.
Set, now, the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increasing
too much or that the flues temperature gets too low to cause condensation in the chimney.
To change the burner setting during the testing in the plant, follows the next procedure, according to the model provided.
Air and Gas Flow Rate Settings by means of Berger STM30../Siemens SQM40.. actuator
1
check the fan motor rotation.
2
Only for burners provided with
Multibloc MB-DLE gas valves:
before starting the burner up, set the slow opening. To set the slow
opening, remove cover
T
, reverse it upside down and use it as a tool to rotate screw
VR
. Clockwise rotation reduces start flow rate,
anticlockwise rotation increases it. Do not use a screwdriver on the screw
VR
!
Note:
the screw
VSB
must be removed only in case of replacemente of the coil.
3
Before starting the burner up, drive the high flame actuator microswitch matching the low flame one (in order to let the burner ope-
rates at the lowest output) to safely achieve the high flame stage.
4
Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and that the burner starts
up;
5
drive the burner to high flame stage, by means fo the thermostat
TAB
.
6
Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values and eventually adjusting the gas by means of the valves group stabiliser.
7
go on adjusting air and gas flow rates: check, continuosly, the flue gas analisys, as to avoid combustion with little air; dose the air
according to the gas flow rate change following the steps quoted below;
SQM40.265 Actuator cams
Recommended combustion parameters
Fuel
Recommended (%) CO
2
Recommended (%) O
2
Natural gas
9 ÷ 10
3 ÷ 4.8
LPG
11 ÷ 12
2.8 ÷ 4.3
MAN-AUTO
X3
X2
X1
(RD) I
High flame
(BU) II
Stand-by
(OG) III
Low flame - gas
(YE) IV
Low flame - oil
(BK) V
Ignition - oil
(GN) VI
Ignition - gas
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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