2.14.2 ENGINEERING CONTROL CENTER (ECC)
2.14.2.1 Provide a complete Direct Digital Control (DDC) system with
complete workstation consisting of a computer, monitor, keyboard, and
printer for new medical centers and for the existing facilities without
ECC.
2.14.2.2 The ECC of different makes are usually not compatible with
each other. The following two options shall be evaluated prior to the
final design of ECC, while designing a control system for a project,
such as an addition and/or modifications to the medical center with an
existing ECC.
(a) Expand the existing system, and consequently, provide a sole
source, proprietary system for the proposed project if it is in the
best interest of the VA. However, the contracting officer's approval
will be required prior to implementing this option into the design.
(b) If the above option is not practical, replace the existing ECC
system with a new ECC system suitable for the existing and the proposed
HVAC control systems.
2.14.2.3 The "MH" drawings must include ECC and DDC schedules of input
and output points for all HVAC systems and equipment as well as
equipment of other trades requiring remote control and monitoring.
Also, show a suitable location in each mechanical room for a
Distributed Control Panel (DCP). Provide emergency power for the ECC
and each DCP.
2.14.2.4 Hand-off-automatic switch, furnished by electrical, shall be
provided for all motor starters on systems controlled from the ECC and
DCP(s). Where applicable, the electrical designer must specify the
input from utility company meters for electrical demand limiting
programs and for monitoring the commercial power supply. When the
optimized start/stop program is used, designer must furnish necessary
load inputs to the ECC.
2.14.2.5 Uninterruptible Power System (UPS): A continuous on-line UPS
shall be provided for ECC while commercial power is being switched over
to emergency power.
2.14.2.6 At medical centers where an ECC operator will not be in
attendance at all times, a remote alarm printer shall be located at the
Boiler Plant or other location recommended by the engineering officer
at the medical center.
2.14.2.7 The following points shall be monitored and controlled if the
associated equipment is provided:
(a) Remote start/stop control, status indication with alarm and total
run time for:
(1) Air handling unit supply and return fans
(2) Exhaust fans. Minor fans may be omitted
HVAC DESIGN MANUAL
2-56
HVAC SYSTEMS AND EQUIPMENT
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