system diagrams must be developed to clearly convey the required scope of
Emergency Electrical Service.
Capacity. The HVAC system equipment serving Critical areas
shall be connected to the essential electrical power system, to assure
service continuation in the event of normal power disruption, in accordance
with the requirements of NFPA 99 (reference 8c). Cooling, as well as
heating, shall be maintained to Critical areas in the event of normal power
address testing requirements for HVAC/Emergency Power System (EPS)
interoperability. HVAC systems connected to the EPS must be shown to
function as intended under conditions of normal power interruption.
Testing of the EPS must be conducted in conjunction with any components of
the HVAC system required for support; For example, thermostatically
operated louvers may be required in emergency generator rooms for makeup
air, generator radiator cooling may be a function of such HVAC components
as pumps or cooling tower, etc. Testing must verify the actual connection
of HVAC equipment to the EPS in accordance with the design following normal
power outage, in the priority sequence established by the design.
Designers shall supplement or modify guide specifications to assure that
such verification testing is adequately detailed and described.
Seismic Design Requirements. Refer to Section 6 for seismic
provisions for the HVAC system equipment and components. Designers shall
be responsible to assure that seismic bracing of HVAC piping is coordinated
by design with thermal expansion compensation features, to allow for the
necessary pipe movement with temperature changes.
Design Coordination. Designers are responsible to coordinate
the HVAC with the electrical, communications, architectural, and structural
aspects of the design to assure that equipment can reasonably be installed
by a contractor providing equipment, and following installation procedures,
within the terms of his contract. For this reason, designers are
instructed to base equipment room and distribution space designs upon
spatial envelopes (including maintenance clearances) which will accommodate
any of at least three manufacturers of major equipment. Routes of ductwork
and piping must be carefully coordinated with other elements, considering
required slope, insulation, bracing, reinforcement, slope, and maintenance
access. This practice in no way infringes on or substitutes for the
construction contractor's responsibility, to be defined in project
specifications, to coordinate the installation work of all trades and to
provide detailed shopdrawings showing the proposed construction; Rather, it
assures that the contractor will be able to achieve his goal without the
necessity of additional design work.
Equipment Rooms. To assure adequate coordination, designers
must consider not only the HVAC equipment, but the work requirements of
other trades. Assure adequate clearance around air handling units to
permit bolting the units together and securing them to their housekeeping
pads, meanwhile providing space for the general contractor to install wall