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B. HVAC EQUIPMENT: Air handling units and similar equipment shall be
housed in a mechanical equipment room or in a mechanical penthouse
building. Penthouse type of fully weatherized roof top units
constructed in standard sections of modules would be acceptable in
lieu of the mechanical equipment rooms or mechanical penthouses.
These units shall provide excess sections for walk through servicing,
maintenance, and shall ensure that the piping connections and
electrical conduits are fully enclosed within the units.
The
designer shall ensure close coordination with the architecture and
structural disciplines for issues, such as, aesthetics, operating
weight, shaft locations, etc., while selecting the roof top units.
C. COORDINATION: Coordinate and make provisions for all necessary
stairs, cat walks, platforms, steps over roof mounted piping and
ducts, etc., that will be required for access, operation and
maintenance. Access to roofs by portable ladder is not acceptable.
D. COOLING TOWERS: Select and locate cooling towers to avoid problems
with esthetics, noise, vibrations, air recirculations or drift.
Include a noise analysis of the proposed cooling tower relative to
adjacent occupancies and consider alternative cooling tower
selections if necessary to meet noise level of 60 dBA at 50 feet
which may be lowered for critical locations. Consider provisions for
security and maintenance lights and receptacles. Provide a permanent
service platform and ladders for access to cooling tower basin access
doors.
8. SEISMIC REQUIREMENTS (HVAC)
8.1 GENERAL
A. Earthquake-resistive design shall comply with the requirements of
Construction Standards CD-54, Natural Disaster Resistive Design,
latest edition of VA Handbook H-08-8, Earthquake Resistant Design
Requirements for VA Hospital Facilities, and the Uniform Building
Code (UBC) published by International Conference of Building
Officials (ICBO).
B. Earthquake-resistive design for HVAC systems shall be provided where
peak horizontal ground acceleration, Amax is 0.10g or greater. The
Amax values for VA sites are listed in VA Handbook H-08-8. These
values must be verified with VA for a specific project before
proceeding with the design.
C. HVAC equipment, certain ductwork, and piping shall be braced in
accordance with the most current edition of Seismic Restraint Manual
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