4. Close burner door, tighten burner door bolts evenly and ensure that entire boiler and venting system is gas tight. 5. Service oil burner in accordance with oil burner manufacturer's instructions. 6. Test the Garber oil filter cartridge with a vacuum gauge under full purge. Compare reading to original vacuum reading of the initial installation and replace if necessary. 7. Replace the oil filter at the oil tank discharge. 8. Reinstall all shields and covers, reconnect fuel line and bleed air from oil delivery supply and connect electrical power to the boiler. 9. Perform complete combustion test with instruments to ensure proper burner operation. Make necessary adjustments. 10. Make sure all test ports are properly sealed after completion of combustion test. Verify that the exhaust venting system is airtight. Use silicone sealant if necessary. Testing of boiler controls and safety devices. Temporarily disconnect power to the heating circulator(s), turn room thermostat to a high setting to fire the burner and verify proper operation of the high limit control. After verification, turn room thermostat to original setting and restore power to the circulator(s). NOTE Upon completion of the annual service, verify that all cover plates, guards and vent pipe connections are properly in place. Make sure that the exhaust venting is gas tight. Use silicone sealant if necessary.