A.O. Smith 3400 Maintenance Procedures, Maintenance Schedules, Inspect Boiler Area, Main Burner

MAINTENANCE PROCEDURES

MAINTENANCE SCHEDULES

Yearly procedures for Service Technician:

•Check for reported problems.

•Check the interior; clean and vacuum if needed.

•Clean the condensate trap and fill with fresh water.

•Check for water/gas/flue/ condensate leaks.

•Ensure flue and air lines in good condition and sealed tight

•Check system water pressure/system piping/expansion tank

•Check control settings.

•Check spark igniter and flame sensors. Clear and clean any deposits.

•Check wiring and connections.

•Perform start-up checkout and performance verification.

•Flame inspection (stable, uniform)

•Flame signal (at least 10 microamps at high fire)

•Clean the heat exchanger if flue temperature is more than 54°F (30°C) above return water temperature.

•Test low water flow conditions.

•Clean the heat exchanger.

•Remove and clean burner using compressed air.

Maintenance by Owner: Daily:

•Check boiler area .

•Check pressure/temperature gauge.

Monthly:

•Check vent piping.

•Check air intake piping (Direct Vent).

•Check air and vent termination screens.

•Check relief valve.

•Check condensate drain system.

•Check automatic air vents .

Every 6 months:

•Check boiler piping (gas and water) for leaks.

•Check and operate the pressure relief valve.

End of season months:

•Shut the boiler down (unless boiler used for domestic hot water)

Make sure the maintenance of the boiler must be performed to assure maximum boiler efficiency and reliability. Failure to service and maintain the boiler and system could result in equipment failure.

Make sure to turn off power to the boiler before any service operation on the boiler except as noted otherwise in this instruction manual. Failure to turn off electrical power could result in electrical shock, causing severe personal injury or death.

INSPECT BOILER AREA

1.Verify that boiler area is free of any combustible materials, gasoline and other flammable vapors and liquids.

2.Verify that air intake area is free of any of the contaminants. If any of these are present in the boiler intake air vicinity, they must be removed. If they cannot be removed, reinstall the air and vent lines per this manual.

Inspect boiler interior:

1.Remove the front access cover and inspect the interior of the boiler.

2.Vacuum any sediment from inside the boiler and components. Remove any obstructions.

GENERAL MAINTENANCE

This is a pre-mix burner system. The flame is not supposed to be directly on the burner. The flame should be just above the burner deck approximately 1/8” and blue in color, see Figure 77.

Figure 77.  BURNER FLAMES

Visually check flame characteristics through the view port located on the top head of the boiler. Figure 77 shows the normal flame condition.

These boilers are designed to give many years of efficient and satisfactory service when properly operated and maintained. To assure continued good performance, the following recommendations are made.

The area around the unit should be kept clean and free from lint and debris. Sweeping the floor around the boiler should be done carefully. This will reduce the dust and dirt which may enter the burner and heat exchanger, causing improper combustion and sooting.

MAIN BURNER

Check main burner every three months for proper flame characteristics. The main burner should display the following characteristics:

•Provide complete combustion of gas.

•Cause rapid ignition and carry over of flame across entire burner.

•Give reasonably quiet operation during initial ignition, operation and extinction.

•Cause no excessive lifting of flame from burner ports.

76