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Page 113
FT
10.F Transmitters
This unit utilizes a pair of pressure transmitters to
determine that the pressure drop across the combustion
air/flue gas side of the system is within acceptable
bounds for proper operation. If during operation the
differential pressure across the system exceeds a
predetermined value at a given firing rate, the system
will shut down and a "Burner An Pressure Error" will
be displayed. The pressure transmitters measure the
differential pressure from the inlet filter box to the outlet
of the heat exchanger. Figure 44 on page 113 shows
the allowable differential versus the firing rate for each
size boiler. This condition may arise due to excessive
duct lengths, blockage of the inlet or outlet ducts, dirty
inlet filter or fouling of the heat exchanger air side.
The pressure transmitter values during pre-purge may
also prevent the boiler from firing. If the differential
pressure exceeds 3.5 inches of water column, the
system will enter a lockout condition and a "Burner
Pressure Error" will be displayed.
See Figure 44 on page 113
Firing Rate (%)
Figure 44. Maximum System Differential Pressure VS Firing Rate
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