Performed annual maintenance on the Trio oil boiler. Replaced the oil nozzle, fuel filter, and pump strainer. Brushed and vacuumed the heat exchanger and flue pipe. Tested and confirmed the operation of all system safety controls. Verified proper function of all burner components. Conducted combustion, smoke, and draft tests. During testing, found that the pressure relief valve did not reseal properly. With customer approval, replaced the boiler’s pressure relief valve. Purged air from the system and confirmed that all heating zones are circulating water properly. Noted that the previously installed nozzle size did not match the manufacturer’s specifications, resulting in off-spec combustion readings. Installed the factory-recommended nozzle and rechecked combustion. Confirmed proper combustion performance and safe operating levels. System is operating properly at this time.
