specified.
**************************************************************************
Provide boiler safety control circuits, including control circuits for
burner [and draft fan], shall be single-phase, two-wire one-side grounded,
and not over 120 volts. Provide safety control switching in ungrounded
conductors. Provide overcurrent protection. In addition to circuit
grounds, ground metal parts which do not carry current to a grounding
conductor.
2.3.14
Indicating Lights
**************************************************************************
NOTE: Delete entire paragraph if boiler input does
not exceed 117 kW 400,000 BTU/hr. Include draft fan
if power burner is specified.
**************************************************************************
Provide indicating lights as follows. Each safety interlock requiring a
manual reset shall have an individually-labeled indicating light.
Non-recycling controls/interlocks shall have the reset located on
control/interlock itself. Indicating lights shall have colors as follows
in lieu of those required by MIL-B-18796:
a.
Amber:
Ignition on
b.
Green:
Main fuel safety shut-off valves open
c.
Red (One for Each): Safety lockout, flame failure, low water
pressure, low water level, and high temperature
[d. Blue:
Draft]
2.3.15
Alarm Bell
**************************************************************************
NOTE: Delete entire paragraph if boiler input does
not exceed 117 kW 400,000 BTU/hr.
**************************************************************************
Provide alarm bell not less than 100 mm 4 inches in diameter, electrically
operated, with a manual disconnect switch. Disconnect switch shall be type
and wired so that switching off alarm following a safety shutdown will not
prevent alarm from sounding again upon recurrence of a subsequent safety
shutdown condition.
2.3.16
Post-Combustion Purge
**************************************************************************
NOTE: Delete entire paragraph if atmospheric burner
is specified.
**************************************************************************
Provide controls and wiring necessary to ensure operation of draft fan for
a period of not less than 15 seconds or of sufficient duration to provide
four complete air changes in the boiler combustion chamber (whichever is
greater) following shutdown of burner upon satisfaction of heat demand.
Upon completion of post-combustion purge period, draft fan shall
automatically shutdown until next restart.
SECTION 15514N
Page 12
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