Unigas S10, Установка, эксплуатация и обслуживание, Страница: 13 / 32

PART I: INSTALLATION 13
Calibration of air pressure switch
Calibration is carried out as follows:
Remove the transparent plastic cap.
After air and gas setting have been completed, start the burner and, while prepurge phase is running, slowly turn the adju-
sting ring nut VR in the clockwise direction until the burner lockout .
Read the value on the pressure switch scale and reduce it by 15%.
Repeat the ignition cycle of the burner and check it runs properly.
Refit the transparent plastic cover on the pressure switch.
Calibration of minimum gas pressure switch
Calibration is carried out as follows:
Remove the transparent plastic cap.
With the burner in operation test the pressure on the pressure port at the input of the gas filter; slowly close the manual shut-
off valve (n. 5 in Fig. 10) until the detected pressure is reduced by 50%. Verify CO emissions of the burner; if the measured
value is less than 80 ppm screw down the adjusting ring nut until the burner lockout. If CO emissions are greater than 80 ppm
open the shut off valve until the CO value is reduced to 80 ppm, then screw down the adjusting ring nut until the burner
lockout.
Fully open the manual shut-off valve (WARNING: carry out this operation ONLY with the burner turned off!).
Refit the transparent plastic cover on the pressure switch.
Fig. 16
Adjusting the combustion head
The burner is adjusted in the factory with the combustion head in the "MAX", corresponding to the maximum capacity.
To operate at a reduced capacity move back the burner head progressively, towards the "MIN" position.
To adjust the combustion head operate on the screw VRT, turning clockwise to move the head back to the "MIN" position.
Don’t close the combustion head completely!
Fig. 17
VR
VRT