FIGURE 3.2: BURNER FLAME COMPARISON/PILOT FLAME

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q3451B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q314A/Q309A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERMITTENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONSTANT PILOT

IGNITION PILOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODELS

MODELS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NORMAL PILOT FLAME

NORMAL

LIFTING

YELLOW

YELLOW

(HARD FLAME) (TOO MUCH AIR)

TIPPING

FLAME

 

 

(MARGINAL)

(TOO LITTLE AIR)

MAIN BURNER FLAMES

Example: A GB200-4L boiler takes 5 minutes, 27 seconds to use 10 cubic feet of natural gas. The local utility indicated the heating value of the natural gas being supplied is 1000 Btu/cu ft. Therefore:

5 minutes, 27 seconds = 327 seconds.

36,000 x 1000 = 110,000 Btu/hr

327

Therefore, the boiler input is correct.

NOTE: Before calculating the input of the heating equip- ment, obtain the heating value of the gas from the local utility.

7.If input needs to be corrected, adjust combination gas valve pressure regulator. (Regulator is factory set at 3- 1/2" W.C. for natural gas and 10" W.C. for propane.) Turn adjusting screw clockwise to increase gas flow (increase input). Turn adjusting screw counterclockwise to decrease gas flow (decrease input). In no case should final manifold pressure setting vary more than + .3" from factory-set pressures. If rated input cannot be obtained with adjustment, gas supply pressure or orifice size may be cause. Consult local utility and Smith.

8.Gas burner orifices supplied with boiler have been care- fully designed to provide correct gas input rate for most gas conditions typically found in the U.S. Occasionally, however, local gas characteristics may not allow unit to be properly adjusted for input. If this is the case, local utility or Smith may recommend orifices be changed. When changing orifices follow the procedures detailed in Section 4 of this manual.

9.Start and stop burners several times by raising and low- ering the thermostat setting.

10.After boiler has been firing long enough to raise boiler pressure above minimum setting of the primary pressure- tol limit, check limit by turning its setting from maximum to minimum setting. This should turn boiler off. Return limit to desired setting.

11.Check boiler safety shutoff controls.

For boilers with intermittent pilot, with boiler firing, discon- nect wire connected to the "PV" terminal on the Honey- well S8600 control. The gas valve should close.

For boilers with constant pilot, with boiler firing, turn the gas control knob on the gas valve to “PILOT”. The burn- ers should go out. Extinguish the pilot and wait 3 min- utes. Turn the gas valve control knob to “ON”. There should be NO gas flow to the main burners with the pilot out! If gas flow is detected, immediately turn the gas valve control knob to “OFF” and have the problem cor- rected.

12.On initial start-up and prior to each heating season, boil- er must be cleaned with a commercially available steam boiler cleaner (see "Steam Boiler Cleaning Instructions" in Section 4 of this manual).

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