Crown Boiler BWF061 Manual De Usuario
42
3) Vacuum Switch – This boiler is equipped with a vacuum switch that is designed to prevent burner operation if the
combustion fan does not operate properly or there is a blockage in the vent system. This switch “makes” (permits
burner operation) as the vacuum increases. Figure 40 shows the correct method of reading the switch vacuum. The
vacuums in Table 9 are the minimums required for reliable operation. After the boiler fires, the vacuum will drop for
several minutes before stabilizing. The vacuum shown under “Burners On” in Table 9 is the minimum reading which
should be observed after the vacuum has stabilized. The Table 9 readings correspond to sea level vacuum switch
settings. Consult your Crown representative for possible variations in settings at altitudes over 2000ft.
burner operation) as the vacuum increases. Figure 40 shows the correct method of reading the switch vacuum. The
vacuums in Table 9 are the minimums required for reliable operation. After the boiler fires, the vacuum will drop for
several minutes before stabilizing. The vacuum shown under “Burners On” in Table 9 is the minimum reading which
should be observed after the vacuum has stabilized. The Table 9 readings correspond to sea level vacuum switch
settings. Consult your Crown representative for possible variations in settings at altitudes over 2000ft.
MODELS
BURNERS ON
BWF061, BWF095
-0.57
-0.51
BWF128, BWF162
-0.96
-0.89
BWF195, BWF229
-1.21
-1.14
TABLE 9: MINIMUM. VACUUM SWITCH
READINGS (in. W.C.)
DURING
PREPURGE