2.14
AUTOMATIC TEMPERATURE CONTROL SYSTEMS
2.14.1 GENERAL
2.14.1.1 Except for small HVAC systems or factory-packaged systems, the
automatic control systems shall be Direct Digital Controls (DDC) type
with pneumatic, electric or electronic operators. Where the medical
center prefers a 100 percent DDC Control System alternate cost estimate
shall be prepared and discussed with the VA. Final selection of the
type of controls shall be confirmed with the VA before proceeding with
complete design of automatic temperature control system.
2.14.1.2 The flow and control diagrams for air, water, glycol, and
steam systems and the sequence of operation for all HVAC systems and
sub-systems shall be shown on the drawings. The diagrams shall show
complete operating description including starting, interlocks, part
load operation, smoke control features, volumetric controls, alarms,
and emergency or power failure associated with operation of HVAC
systems.
2.14.1.3 Temperature and humidity controls may be electric (small jobs
only), electronic, or pneumatic, except that pneumatic or electronic
control shall be required for the operating suites. Each humidistat for
an operating room shall directly control a terminal humidifier through
high limit controller. See Article 2.3 for HVAC Equipment Requirements,
and for psychiatric areas, see Article 3.18.
arranged to operate automatically with emergency generator power in the
event of utility power failure. Sizing of the air compressor is the
responsibility of the control system manufacturer based on a 1/3 on 2/3
off run time basis as outlined in the specification. However, the
electrical service and location of the compressor must be shown on
drawings.
2.14.1.5 Outdoor air temperature and humidity sensors shall be located
outdoors, and not in outdoor air ducts. Provide shading for sensors.
Sensors shall be protected from direct sunlight and be easily
accessible.
2.14.1.6 Show local temperature control panels (LTCP) and distributed
control panels (DCP) on drawings.
2.14.1.7 Control wiring and tubing shall be concealed. Use of wire mold
will not be acceptable.
2.14.1.8 Mount room thermostats at 1.5 m (5 feet) above the finished
floor.
2.14.1.9 ROOM TEMPERATURE CONTROL: All perimeter rooms and patient
bedrooms shall have individual temperature control. As many as four
small interior rooms of similar function and load may be grouped into
one zone. Laboratories or other spaces, in which the supply air volume
is based on special air requirements, shall also have individual
temperature control.
HVAC DESIGN MANUAL
2-55
HVAC SYSTEMS AND EQUIPMENT
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