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License Numbers: VA 2701001733 • WV 001545 • NC L.34582 & U.33082 <br /> L. Check for leaks on all gas valves and pressure regulators. (Gas fired only.) <br /> M. Check all vent lines for connection and obstruction. (Gas fired only.) <br /> N. Clean and inspect burner tube and fire cone. (Gas fired only.) <br /> O. Flush sediment from make-up water feed control. <br /> P. Check and adjust low water cut-off control. <br /> <br /> 2. SEASONAL START-UP – (May be performed concurrently with Annual Maintenance.) <br /> <br /> A. Re-fire boiler per manufacturers recommendations. <br /> B. Verify correct operation of gas valves. (Gas fired only.) <br /> C. Test gas pressure at burner, check and adjust burner and pilot pressure regulators as required. (Gas fired <br />only.) <br /> D. Test all safety and operating controls, calibrate as required. <br /> E. Test flame failure control for positive shut-off upon loss of flame. <br /> F. Test water pressure safety/relief valve for correct relief setting and positive seal. <br /> G. Observe burner flame through entire range of modulation from low fire to high fire. <br /> H. Perform smoke spot efficiency test and adjust fuel pressure or volume regulating valve cam as required. <br />Test to be performed at low fire, mid fire, high fire. Adjust combustion air dampers as required. <br /> I. Confirm smooth full range operation of burner modulation motor and associated components. <br /> J. Test and adjust stack draft per manufacturers recommendations. <br /> K. Perform O² and CO² combustion efficiency tests. Check stack discharge temperature and adjust for <br />Page 6 of 12 <br />Docusign Envelope ID: FE461C71-1EDD-473B-A187-2C2D6DBD735B