d.
Red (One for Each): Safety lockout flame failure and low water
pressure, low water level, [and] high temperature [, low gas
pressure, and high gas pressure].
2.3.17
Alarm Bell
Provide alarm bell not less than 100 mm 4 inches in diameter, electrically
operated, with a manual disconnect. 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.
2.3.18
Post-Combustion Purge
**************************************************************************
NOTE: Select four-air-change purge for Size 1, Size
2, and Size 3 burners. Select eight-air-change
purge for Size 4 burners.
**************************************************************************
Provide a post-combustion purge in addition to the operating sequence
required by MIL-B-18796. Provide controls and wiring necessary to assure
operation of draft fan for a period of not less than 15 seconds or of
sufficient duration to provide [four] [eight] 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.
2.3.19
Draft
Comply with boiler manufacturer's recommendations.
2.3.20
Stack, Breeching, and Supports
Provide boiler stack constructed of sheet steel having a thickness of not
less than 2.47 mm 0.0972 inches with welded joints. Insulate stack located
inside the building with 38 mm 1 1/2 inches of mineral wool conforming to
applicable requirements of ASTM C 59/C 59M2, Class II - for use up to 649
degrees C 1200 degrees F. Insulation shall receive a finish coat of
finishing cement not less than 19 mm 3/4 inch thick, trowelled to a smooth
finish. Provide stack supports, umbrella collar and cap, and flue
transition piece. Stack diameter and height shall be in accordance with
manufacturer's recommendation and conform to NFPA 211.
2.3.21
Hot-Water Coils
**************************************************************************
NOTE: Delete entire paragraph unless hot-water
coils are required to instantaneously heat domestic
water.
**************************************************************************
Provide coils capable of heating [_____] L/s GPM of water with [_____]
degrees C F rise conforming to MIL-B-17452.
SECTION 15515N
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