1. Open fire box door and inspect bottom row of tubes, refractory panels, and the burner bed. Clean burner bed surfaces by using compressed air. All rust particles blown off burners shall be cleaned up and disposed of before leaving site. 2. Open drip/dirt legs to all vent lines. Disconnect vent lines at all diaphragm valves and switches as well as the main gas pressure regulator. 3. Check all wye strainer screens. 4. Open and clean all McDonnell Miller #64 low water cut-off controllers. 5. Check high limit control operation. 6. Check high limit control, operator control and pressure/temperature gauge for normal accuracy. 7. Relief test: With boiler pressure at 75% of relief valve set pressure, use relief valve lever to manually open the valve. Leave open 5 seconds and then close again.
