at once. Pilot burner should ignite after gas reaches the pilot burner.
b.Spark ignition should
c.Main gas valve should open and main burner should ignite after gas reaches the burner port.
Inspections
Burners
Clean main burners and air louvers of dust, lint and debris. Keep boiler area clear and free from com- bustibles and flammable liquids. Do not obstruct the flow of combustion and ventilation air. Make visual check of burner and pilot flame. Yellow flame indicates clogging of air openings. Lifting or blowing flame indi- cates high gas pressure. Low flame indicates low gas pressure.
Modulating burner flame varies in height from approximately 1/4" at low fire to approximately 4" at high fire.
Fig. 41: Typical Main Burner Flame
Fig. 42: Pilot Burner Flame (IID Units)
Fig. 43: Pilot Burner Flame (Standing Pilot Units)
Controls
Check all controls to see that they are operational. To check electronic safety (IID Models), turn off main burner. Observe pilot burner when shutting off pilot gas. Ignition spark should go on. Main gas valve will also drop out.
To check high limit switch, turn dial setting down to a point slightly below the temperature of the water leav- ing the heater. The reset button should snap out and the burner should
Suggested Inspection
Schedule
The boiler should be inspected on the first and third months after initial
1.Remove top of heater and inspect heat exchanger for soot and examine venting system.
2.Remove rear header and inspect for scale deposits, and/or accelerated erosion.
*3. Inspect pilot and main burner flame and firing rate.
*4. Inspect and operate all controls and gas valve.
*5. Visually inspect system for water leaks.
*6. a. Oil pump motor and bearing assembly, if oil cups are provided.
b. Disconnect pump from header and check condi- tion of pump impeller. Check condition of bearing by attempting to move impeller from side to side.
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