Chapter 5 Adjustment Procedures
5-10 750-177
Manual resetting is necessary after a pressure drop. Press the reset lever after pressure is restored. Be sure
that the mercury switch equipped control is level.
R. HIGH GAS PRESSURE SWITCH
Adjust the scale setting to slightly above the normal burning pressure. The control circuit will be broken when
pressure exceeds the normal operating pressure. Unnecessary shutdowns may result if the setting is too close
to normal; however, regulations require that the setting may not be greater than 150% of rated pressure.
Manual resetting is necessary after a pressure rise. Press the reset lever af
ter pressure falls. Be sure that the
mercury switch equipped control is level.
S. FUEL OIL PRESSURE AND TEMPERATURE - GENERAL
Variations in burning characteristics of the fuel oil may occasionally require adjustments to assure highest
combustion efficiency. The handling and burning characteristics may vary from one delivery of oil to another.
Therefore, it is recommended that the oil system be inspected from time to time to verify that pressures and
viscosity are at the proper operating levels.
Because of variation in oils, including chemical content, source, blends, and viscosity
characteristics, the
temperatures and pressures listed in Chapter 5, and mentioned in the adjusting of the controls in the following
paragraphs, will vary and thus may be regarded as tentative and to be changed to provide best firing
conditions. Review of the applicable maintenance instructions given in Chapter 8 will aid in maintaining an
efficient fuel system.
Table: 5-1 Fuel Consumption (Natural Gas)
MODEL NO. 150 200 250 300 350 400 450 500 550 600 700 800 900 1000 1100 1200
Fuel Consumption
Gas (cfh)
A
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 7000 8000 9000 10000 11000 12000
A. Natural Gas @ 1000 Btu/cu-ft.
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