b'COMMISSIONING EN5 .4 .1Air flap positionTurn the hex key (1) supplied: clockwise to increase the air flap opening (O 2rises, CO 2decreases). counterclockwise to reduce the air flap opening (O 2decreases, CO 2rises).O 2-CO 2+O 2+CO 2-1Fig. 33 5 .5Adjusting burner output1823 745 61Fuel-oil solenoid valve 5Suction connection2Solenoid valve electrical connection 6Return connection3Fuel delivery pipe 7Oil pressure regulator4Vacuum port pressure gauge connection 8Oil pressure gauge connectionFig. 34WARNINGContinuously check CO, CO 2and soot emissions when adjusting the output of the burner. CO WARNING must not exceed 50 ppm.37/64'