Unigas HTP90A, Руководство по установке, использованию и обслуживанию

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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 the air and gas rate are now adjusted at the maximum power stage, go on with the point to point adjustement on the SV adjusting
cam as to reach the minimum output point.
10 as for the point-to-point regulation, move the gas low flame microswitch (cam III) a little lower than the maximum position (90°);
11 Set the
TAB thermostat to the minimum in order that the actuator moves progressively towards the low flame position;
12 move cam III 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 V to increase the rate, unscrew to decrease.
13 Move again cam III towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
14 If it is necessary to change the burner output in the low flame stage, move cam III: the low flame position must never match the
ignition position, that is why cam III must be set 20°-30° more than cam II.
15 Now adjust the pressure switches (see next par.).
Keys
GV
gas valves group
ID1
air damper index
ID2
index
PA
air pressure switch
SC
actuator
SV
adjusting cam
V
adjusting screws
VF
butterfly valve
VR
T
Siemens VGD..
VRA
RA
TR
ID1
VF
PA
SC
SV
GV
ID2
V
SV
Gas butterfly valve closed Gas butterfly valve open