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Inspection Procedures
Burners
Clean main burners and air louvers of dust, lint and
debris. Keep heater area clear and free from com-
bustibles and flammable liquids. Do not obstruct the
flow of combustion and ventilating air. Make visual
check of burner and pilot flame. Yellow flame indicates
clogging of air openings. Lifting or blowing flame indi-
cates excess high gas pressure. Low flame indicates
low gas pressure.
Fig. 26: Typical Main Burner Flame
Fig. 27: Pilot Burner Flame (IID units)
Fig. 28: Pilot Burner Flame (STG 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.
High Limit Switch - to check high limit switch, turn dial
setting down to a point slightly below the temperature
of the water leaving the heater. The reset button
should snap out and the burner should shut off. Reset
dial to 30°F to 40°F above desired operating tempera-
ture, and push reset button. Burner should light.
Low NOx Heaters—Models 261–401
The Low NOx Heater is offered as a model W1-ON-
OFF firing.
The heaters are certified and tested under the ANSI
Z21.10.3 Standards for hot water heaters.
The heater should be installed to meet all local codes,
the National Fuel Gas Code Z223.1 and with the
National Electrical Code, ANSI/NFPA 70.
SEE DETAIL VIEW A
DETAIL A
Fig. 29: Burner Detail