06-06
b. Interior offices and non-resident areas: Based on the
architectural layout, as many as six offices can be grouped
together as one temperature control zone.
5. Limitations:
a. The interior and perimeter spaces shall not be grouped together
to form one temperature control unit.
b. Areas on different exposures.
c. Corridors and occupied (perimeter or interior) areas.
B. FAN VOLUMETRIC CONTROLS: For fan volumetric controls of the VAV
(variable air volume systems), the following guidelines shall apply:
1. Variable Speed Drive Package: For air handling units of 10,000 CFM
and larger capacities, the package of the volumetric controls
shall consist of the variable speed drives for the supply and
return air fans and the control accessories comprising of the air
flow measuring devices and static pressure sensor(s). The
preferred sequence of operation is described in VA Standard
Details No. 15900-11,11A,B,C.
2. Constant Speed Operation: For air handling units smaller than
10,000 CFM capacity, the individual room temperature control shall
involve variation in the supply air volume.
However, the supply
and return air fans shall continue to operate at constant speed.
C. HEATING CONTROLS: See Article 4.
D. COOLING CONTROLS: See Article 5.
3.5 SMOKE AND FIRE CONTROL
A. SMOKE DETECTORS AND SMOKE DAMPERS:
1. SMOKE DETECTORS: A duct mounted smoke detector shall be installed
in the main supply air duct, on the downstream side of the after
filters and prior to any duct takeoff, of all supply air systems
of capacities greater than 2,000 CFM. Upon smoke detection, the
duct detector (through its auxiliary contacts) shall:
a. Stop the supply and associated return air fan; the building
exhaust air fan(s) shall continue to run.
b. Sound an alarm at the fire alarm system.
c. Sound an audible alarm and print an alarm message at the
central engineering control center (ECC).
2. SMOKE DAMPERS: In addition to the supply air duct detector listed
in Paragraph 1, for air handling units with capacities larger than
15,000 CFM and serving more than floor, the following shall be
provided:
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