Service manual

SC Series Boilers – Installation and Service Manual
15
will not restart the ignition sequence and the boiler will be able to be put back into operation
only by removing the blockage and resetting the electrical power to the controller.
6) Turn Gas Valve to ON. Main burner(s) should ignite. Check main burners and adjust the airflow,
if necessary, as described in Section 3.3 and 3.5.
7) Check for gas leaks of the joint between the gas valve outlet and manifold.
8) Assure that all other gas appliances are turned off, including their pilot flames.
9) Check manifold pressure reading on the manometer and make necessary adjustments. Check
burner input matches the rating plate input or is correctly derated for high altitude installations, as
described in Section 3.6 and 3.7.
10) Return thermostat and controls to normal operating settings.
b) Sequence of Control System operation
The sequence of control system operation is as shown in the following chart: