d.
Controller digital displays shall be as follows in their
respective engineering units:
1.
Controller output.
2.
Flue gas temperature.
3.
Combustion air temperature.
4.
Boiler efficiency.
5.
Flue gas oxygen percentage.
6.
Jackshaft position.
e.
Controller inputs shall be:
1.
Fuel flow (oil or natural gas) (Analog).
2.
Flue gas temperature (Analog).
3.
Flue gas oxygen (Analog).
4.
Combustion air temperature (Analog).
5.
Fuel selection (Contact).
6.
Remote alarm silence (Contact).
7.
Jackshaft position (Analog).
f.
Controller outputs shall be:
1.
Oxygen trim actuator (Analog).
2.
Boiler efficiency.
3.
Remote audible alarm (Contact).
g.
Controllers shall be provided with protocol converter/gateways
with EIA ANSI/TIA/EIA-485-A multi-drop communications port for
controller LAN network interconnection to field panel controllers
[and to supervisory workstation.]
2.5.12
Alarm Annunciator
a.
Each boiler master panel shall be provided with single horn and
single alarm silencing pushbutton. First out alarm annunciation
shall be provided for following alarm points and they shall
activate alarm horn:
1.
Low steam pressure.
2.
High steam pressure.
3.
Low water level.
4.
Low oxygen.
SECTION 15561A
Page 49
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