Burnham FREEDOM Installation, Operating And Service Instructions page 63

Each FCM series boiler is tested at the factory and adjustments to the air-
fuel mixture are normally not necessary. Consult a U.S. Boiler representative
before attempting to make any such adjustments. Improper gas valve or
mixture adjustments could result in property damage, personal injury, or loss
of life.
12) Test any external limits or other controls in accordance with the manufacturer's instructions.
13) Verify that the boiler starts and stops in response to calls for heat from the heating thermostat and indirect water heater
thermostat. Make sure that the appropriate circulators also start and stop in response to the thermostats.
14) As shipped, the heating and indirect water heater set point supply temperatures are both set to 180°F. If necessary, adjust
these to the appropriate settings for the type of system to which this boiler is connected. See the Operation section of this
manual for information on how to do this.
15) Adjust the heating and indirect water heater thermostats to their final set points.
Warning
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