2.13.1.2 The subdivision of the building spaces into smoke zones shall
conform to NFPA 101. All smoke partitions shall be shown on the HVAC floor
plans exactly as depicted on the architectural floor plans.
2.13.1.3 All duct-mounted smoke detectors, furnished by the electrical
discipline, shall be shown on the HVAC drawings. The duct-mounted smoke
detectors, if and when furnished in conjunction with the duct mounted smoke
dampers, shall always be installed on the upstream side of the dampers.
(Refer to VA Standard Detail 15900-20). The space-mounted smoke detectors
need not be shown on "H" drawings.
2.13.1.4 The sequence of operation for the duct (or space) mounted smoke
detectors, shall be described with the automatic temperature control drawings
of the affected HVAC systems.
2.13.1.5 All duct-mounted smoke and combination fire/smoke dampers shall be
individually numbered, shown and scheduled on "H" drawings in accordance with
the VA Standard Detail 15000-48.
2.13.2 SMOKE CONTROL
2.13.2.1 GENERAL: Smoke control systems for all HVAC systems, except atriums,
shall be automatic shutdown type as described in the next paragraphs. The use
of the engineered smoke control systems is not permitted.
2.13.2.2 SMOKE DETECTORS - SUPPLY AIR SYSTEMS: For all supply air systems,
with capacities in excess of 56 cu m/Min (2,000 CFM), a duct mounted smoke
detector shall be shown in the main supply air duct on the downstream side of
the after-filters and prior to any takeoffs. When activated, this detector,
through its auxiliary contacts, shall do the following. It should be,
however, noted that duct-mounted smoke detector is not required in the main
return air duct to correspond with a duct detector installed in the supply
air duct. The smoke dampers are required only if the air handling unit serves
multiple floors.
(a) Stop the supply air fan
(b) Stop the return air fan associated with supply air fan
(c) Send an alarm signal to the building fire alarm system
(d) Send an alarm signal and printed message to Engineering Control Center
(ECC)
2.13.2.3 SMOKE DETECTORS/DAMPERS - SUPPLY AIR SYSTEMS WITH RETURN AIR FANS:
In addition to what is stated in paragraph 2.13.2.2 above for air handling
units, Supply Air Systems larger than 420 Cu M/Min (15,000 CFM) and serving
more than one story shall have the following provisions:
(a) Provide duct-mounted smoke detectors in each branch return air duct, at
each floor, as the branch duct enters the main vertical return air duct.
(b) Isolate air-handling units by providing smoke dampers in the supply and
return air ducts as shown in Smoke and Fire Protection Control Diagram
2.13.4.
HVAC DESIGN MANUAL
2-49
HVAC SYSTEMS AND EQUIPMENT
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