be taken through the wall at each fan-coil unit provided automatic intake
dampers are used.
2.5.3 INSTALLATION RESTRICTION
Ceiling mounted (above or below the suspended ceiling) fan coil units are not
permitted, unless there are physical limitations in an existing building
where it is not possible to install them under the windows.
2.5.4 INTERIOR ROOMS
Fan-coil units shall not be used in interior rooms where chilled water may
not be available to handle the cooling load in cold weather.
2.6 RADIANT CEILING PANEL SYSTEMS
2.6.1 GENERAL
2.6.1.1 Use of radiant ceiling panels for cooling in new construction areas,
as well as cooling of patient care and waiting areas in high humidity areas
of the country is not permitted. However, in existing buildings with physical
limitations, such as inadequate furred ceiling and shaft spaces and
mechanical rooms for equipment and ductwork, use of radiant ceiling panels is
permitted. Areas having above mean annual dew point temperature of 40-45
degrees are considered high humidity areas.
2.6.1.2 See VA Master Specifications Section 15835, "RADIANT CEILING PANEL
SYSTEMS" and Standard Detail 15705-51.DWG for system capacities and piping
connections to radiant panels.
panels, published by different manufacturers, are not based on identical
parameters. Further, the published ratings are not certified by any
independent testing agency. It is, therefore, incumbent upon the designer to
obtain a written approval from at least three manufacturers confirming their
ability to supply the radiant panels capable of performing duty conditions as
specified in the VA Master specification.
2.6.2 CEILING PANELS
The radiant ceiling panels shall either be modular type 600 mm x 600 mm or
600 mm x 1200 mm (2 ft x 2 ft or 2 ft x 4 ft) size or continuous, wall-to
wall, linear type. The modular panels shall be installed in an "exposed lay-
in" type ceiling arrangement. See Article 3.18 for the "concealed snap in"
type ceiling system for psychiatric areas. When the active modular heating
and cooling radiant panels would occupy approximately 50 percent room ceiling
area, the remaining inactive panels shall also be matching metal construction
and shall be furnished by the heating and cooling panels manufacturer. With
wall-to-wall linear radiant ceiling panels, the remaining suspended ceiling
shall be furnished under architectural work. Provide easy access to piping
above ceiling.
2.6.3 SPECIAL DESIGN CONSIDERATIONS
2.6.3.1 VENTILATION AIR: Provide outdoor air, properly cooled and heated, for
the spaces cooled and heated by the radiant panels to handle the latent load.
The ventilation air shall be at least 0.01 Cu M/Min per 0.09 Sq M (0.4 CFM
per Sq Ft) of floor area, or more, if required, to meet the exhaust needs or
HVAC DESIGN MANUAL
2-11
HVAC SYSTEMS AND EQUIPMENT
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