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and last ten low boiler inlet temperature events. When boiler inlet water temperature is below
a minimum setpoint a low temperature events shall be stored with time, date, “lowest
temperature for event” and “duration below setpoint” data. A panel mounted red alarm light
shall annunciate alarm messages. Alarm conditions requiring a manual reset shall be
annunciated by a flashing red light. At a minimum, the boiler system shall display the
following:
1. Numeric Display with Engineering Units:
a. Boiler supply Water Temperature
b. Boiler Return Water Temperature
c. Remote System Temperature (when required by contract drawings)
d. Outside Air Temperature (when required by contract drawings)
e. Firing Rate %
f. Boiler Temperature Setpoint
g. Mixing Valve % (when required by contract drawings)
2. Status, Startup And Shutdown Sequence English language Messages:
a. Boiler disabled
b. Warm Weather Shutdown
c. Lockout
d. Pump Purge
e. Limit Hold
f. Purge / Pilot Ignition
g. Low Fire / Pilot Ignition
h. Main Burner Ignition
i. Boiler Running
j. Fan Post Purge
k. Pump Cooldown
l. Standby
3. Alarm, System Diagnostic, First-Out English language Messages: (numeric code
numbers shall not be acceptable):
a. Low Water Level (when required by contract drawings)
b. Low Water Flow (when required by contract drawings)
c. Fuel Limit (gas pressure or oil temperature)
d. High Boiler supply Temperature Limit
e. Low Return Water Temperature
f. Low Air Flow
g. Flame Safeguard Internal Fault
h. High supply Temperature
i. Supply Temperature Sensor Fault
j. Return Temperature Sensor Fault
k. Outside Air Temperature Sensor Fault
l. Remote System Temperature Sensor Fault
m. Remote Input Signal Fault
n. Modbus Communication Fault
o. Memory Fault
F Flame Safeguard (FSG)
An industrial duty microprocessor-based FSG shall provide: safety interlocks, flame
monitoring protection and timed sequences. Sequences shall include forced draft fan start
and stop, furnace purge, burner light-off and shutdown and post-purge. Control components
shall be fully integrated for automatic sequencing of light-off and shutdown.
G Boiler Pump Sequence
Include primary water pump control to allow boiler warm-up to the return water temperature
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