27DEMETRAEN11.4 MAIN CONTROL PANELFig. 27 - Main control panelA - Thermostatic adjustmentAdjusts the inlet of comburent air. By turning the knob to cold position, the closing (based on boiler watertemperature), will be anticipated.B - Sistem pump thermostatDefine the system pump activations.11.5 SMOKE BYPASSFig. 28 - Smoke valveSmoke bypass (see Fig. 28 page 27): by lightening the boiler, turn fo 90° the knob to position B to allow thedirect smoke passage to the flue duct, helping the starting of the flame and the heating of the flue self. After thestarting, turn the knob back to position A (see ADJUSTMENT page 28).11.6 GENERAL CHECKS- Check that the system is full of water.- That the safety heat exchanger is connected to the water system through the valve (see Fig. 23 page 22),only for VF version.- That the electrical connections have been made.- That the chimney flue is effective.- That all the pumps are functioning.- That all the accessories (grills, etc.) are positioned in their seats.- When locating both the grills in their seats it is essential to position them with the EMBERS SIDE upwards (see Fig.29 page 28).