State Industries THRU SBD85500NE, SBD71120NE warranty GAS Valves, Checking the Input

TYPICAL PILOT AND MAIN BURNER FLAMES

FIGURE16

If the preceding burner characteristics are not evident, check for accumulation of lint or other foreign material that restricts or blocks the air openings to the burner or heater.

NOTE: Cleaning of main burners.

1.Remove main burners from unit.

2.Check that burner venturi and ports are free of foreign matter.

3.Clean burners with bristle brush and/or vacuum cleaner — DO NOT distort burner ports or pilot location.

4.Reinstall burners in unit. Make sure front and rear of burners are installed correctly in burner support brackets.

Also check for good flow of combustion and ventilating air to the unit. Maintain a clear area around the heater at all times.

GAS VALVES

Figure 16 shows the two types of combination gas control valves used on these heaters.

FIGURE16

If the gas valve becomes defective, repairs should not be attempted. A new valve should be installed in place of the defective one.

CHECKING THE INPUT

For appliance installation locations with elevations above 2000 feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.

1.Attach a pressure gauge or a manometer to the gauge port and refer to Table 5, for correct manifold pressure.

2.Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not operating during this interval.

3600 X H = Btuh

T

T= Time in seconds to burn one cubic foot of gas. H = Btu’s per cubic foot of gas.

Btuh = Actual heater input.

Example: (Using SBD-240 heater)

T= 15.8 seconds H = 1050 Btu Btuh = ?

36.8X 1050 = 240,000 Btuh (70.3 kWh) (Compare with

15.9heater model and rating)

Should it be necessary to adjust the gas pressure to the burners to obtain the full input rate, the steps below should be followed:

3.Remove the regulator adjustment sealing cap, fig. 17, and adjust the pressure by turning the adjusting screw with a screwdriver.

Clockwise to increase gas pressure and input rate.

Counterclockwise to decrease gas pressure and input rate.

4.“Clock” the meter as in step 2 above.

5.Repeat steps 3 and 4 until the specified input rate is achieved.

6.Turn the gas control knob to PILOT. Remove the pressure gauge and replace the sealing cap and the allen wrench set screw in the pressure tap opening.

WARNING

UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT EXCEED THE INPUT SHOWN ON THE HEATER MODEL AND RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER.

When the heater is operating at full capacity, or full gas input, it should consume 1 cu. ft. of gas in time indicated on Table 6.

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