PART III: OPERATION
30
8
To adjust the
air flow rate in the high flame stage
, loose the
RA
nut and screw
VRA
as to get the desired air flow rate: moving
the rod
TR
towards the air damper shaft, the air damper opens and consequently the air flow rate increases, moving it far from the
shaft the air damper closes and the air flow rate decreases.
Note:
once the procedure is perfomed, be sure that the blocking nut
RA
is fasten. Do not change the position of the air damper
rods.
9
If necessary, adjust the combustion head position (see the dedicated paragraph)..
10 The air and gas rate are now adjusted at the maximum power stage, go on with the point to point adjustement on the
SV1
(gas
side) adjusting cam as to reach the minimum output point.
11 as for the point-to-point regulation, move the gas low flame microswitch a little lower than the maximum position (90°);
12 set the
TAB
thermostat to the minimum in order that the actuator moves progressively towards the low flame position;
13 move the gas low flame microswitch to the minimum to move the actuator towards the low flame until the two bearings find the
adjusting screw that refers to the lower position: screw
V1
to increase the rate, unscrew to decrease.
14 Move again the gas low flame microswitch towards the minimum to meet the next screw on the adjusting cam and repeat the pre-
vious step; go on this way as to reach the desired low flame point.
15 Now adjust the pressure switches.
Fully-modulating burners
.To adjust the fully-modulating burners, use the
CMF
switch on the burner control panel (see next picture), instead of the
TAB
thermo-
stat as described on the previous paragraphs about the progressive burners. Go on adjusting the burner as described before, paying
attention to use the CMF switch intead of
TAB
.
The
CMF
position sets the oprating stages: to drive the burner to the high-flame stage, set CMF=1; to drive it to the low-flame stage, set
CMF=2.
Attention! if it is necessary to change the head position, repeat the air and gas adjustments described above.
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
VRA
RA
TR
SV1
V1
SV2
Gas throttle valve open
Gas throttle valve clo-
sed
CMF
Содержание HR1025
Страница 35: ...PART III OPERATION 35 Fig 11 Bergonzo B nozzle example with 850kg h nozzle Pump flow rate Nozzle flow rate ...
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Страница 49: ...LME73 000Ax PME73 831AxBC LME73 831AxBC Service instruction manual M12921CB Rel 1 2 02 2016 ...
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