Burnham MST288 Adjusting Fuel Pump Pressure, G. ADJUST OIL BURNER WHILE OPERATING. flame present

5.Adjust oil pressure.

a.When checking a fuel unit's operating pressure, a reliable pressure gauge may be installed in either the bleeder port or the nozzle port. See Figure

23.

b.Locate oil pressure adjusting screw and turn screw to obtain proper pump pressure, refer to Table 8 at rear of manual.

c.To check the cut-off pressure, deadhead a reliable pressure gauge onto the copper connector tube attached to the nozzle port. Run the burner for a short period of time. Shut the burner off. The pressure should drop and hold.

d.Remove the gauge and install bleeder port and/or reconnect the nozzle port line.

Figure 23: Adjusting Fuel Pump Pressure

G.ADJUST OIL BURNER WHILE OPERATING. (flame present)

1.ADJUST DRAFT REGULATOR for a draft of zero inches (water gauge) in the canopy (see Figure

18) after chimney has reached operating temperature and while burner is running. (At least five minutes) See Table 8 at rear of manual for details.

2.READJUST THE AIR BAND on burner for a light orange colored flame while the draft in the canopy is zero inches water column ("w.c.). Use a smoke tester and adjust air for minimum smoke (not to exceed #1) with a minimum of excess air. Make final check using suitable instrumentation to obtain a CO2 of 11.5 to 12.5% with draft of zero inches water column ("w.c.) (water gauge) in canopy.

These settings will assure a safe and efficient operating condition. If the flame appears stringy instead of a solid fire, try another nozzle of the same type. Flame should be solid and compact. After all adjustments are made recheck for a draft of zero inches water column ("w.c.) in the canopy. Replace plug at completion.

See Table 8 (at rear of this manual) for details regarding the overfire pressure when baffles are both installed and removed.

3.READJUST THE HEAD SETTING only if necessary.

a.MST288 & MST396:

Beckett MB(L1) Head burner has a fixed head which is non-adjustable.

b.MST513 & MST629:

Beckett MD(V1) (variable) Head burners have the ability to control air by moving the head. It might be necessary to move the head forward or back one position at a time to optimize the smoke and CO2 readings. See Figure 24.

4.TURN “OFF” BURNER and remove pressure gauge. Install gauge port/bleeder plug and tighten. Start burner again.

WARNING

Do not loosen or remove any oil line fittings while burner is operating.

5.FLAME FAILURE

The MegaSteam™ boiler controls operate the burner automatically. If for unknown reasons the burner ceases to fire and the reset button on the primary control has tripped, the burner has experienced ignition failure.

WARNING

Do not attempt to start the burner when excess oil has accumulated, when the unit is full of vapor, or when the combustion chamber is very hot.

H.CHECK FOR CLEAN CUT OFF OF BURNER.

1.AIR IN THE OIL LINE between fuel unit and nozzle will compress when burner is on and will expand when burner stops, causing oil to squirt from nozzle at low pressure as the burner slows down and causing nozzle to drip after burner stops. Usually, cycling the burner operation about 5 to 10 times will eliminate air from the oil line.

2.IF NOZZLE CONTINUES TO DRIP, repeat Paragraph H, No. 1. If this does not stop the dripping, remove cut-off valve and seat, and wipe both with a clean cloth until clean, then replace and readjust oil pressure. If dripping or after burn persist replace fuel pump.

I.TEST CONTROLS.

1.Check thermostat operation. Raise and lower thermostat setting as required to start and stop burner.

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