Unigas KP91, Manual Of Installation - Use - Maintenance

Page: 42 / 75

PART III: OPERATION
42
shaft the air damper closes and the air flow rate decreases.
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 (FGR
side) adjusting cam as to reach the minimum output point.
11 Procedere, ora, alla regolazione dei pressostati.Now adjust the pressure switches.
12 If necessary, adjust the combustion head position (see the dedicated paragraph)..
13 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.
14 as for the point-to-point regulation, move the gas low flame microswitch a little lower than the maximum position (90°);
15 set the
TAB thermostat to the minimum in order that the actuator moves progressively towards the low flame position;
16 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.
17 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.
18 Now adjust the pressure switches.
19
20
Calibration air and gas pressure switches
The air pressure switch locks the control box if the air pressure is not the one requested. If it
happens, unlock the burner by means of the control box unlock pushbutton, placed on the bur-
ner control panel.
The
gas pressure switches check the pressure to avoid the burner operate when the pres-
sure value is not in the requested pressure range.
Calibration of low gas pressure switch
As for the gas pressure switch calibration, proceed as follows:

Be sure that the filter is clean.

Remove the transparent plastic cap.

While the burner is operating at the maximum output, test the gas pressure on the pressure port of the minimum gas pressure
switch.

Slowly close the manual cutoff valve (placed upstream the pressure switch, see gas train installation diagram), until the detected
Note: once the procedure is perfomed, be sure that the blocking nut RA is fasten. Do not change the position of the air dam-
per rods.
Attention! if it is necessary to change the head position, repeat the air and gas adjustments described above.
RA
VRA
TR
TTENZIONE
SC
SV1
V1
ID1
V1
SV1
Gas throttle valve open Gas throttle valve clo-
sed
VR