Note: Above VAV Box Supply Temperature (from box to
space) greatly helps maintenance and
troubleshooting.
2. Direct Digital Controller Architecture
Schematic: Show general architecture of DDC system
including controllers, communication LANs,
workstation terminal, etc.
3. Electric Elementary/Ladder Diagrams: Show line
and control circuitry, motor starters, motor loads,
control device actuators, manual and automatic
switches, interlocks, and control sensors.
4. Dampers: Show type of damper (opposed or
parallel blade).
5. Control Valves: Show control valve nominal
size, flow capacities, type of fluid, inlet
pressure, maximum and minimum pressure drop at
design flow, and calculated Cv.
6. Include the following required controller
parameters:
a.
detailed sequence of operation
b. schedules and setpoints for all control loops
and HVAC equipment
c.
specify "dead-band" between heating and cooling
d.
differential setpoints for two position control
7. Show pressure and temperature indicator scale
ranges and location. Show location of temperature
wells and pressure taps.
8. Indicate smoke detection system and location of
key-operated override switch, when required.
9. Indicate location of meters provided in this and
other sections if monitored by the DDC system.
10. Show location of room sensors, pressure sensors
and outdoor air temperature sensors.
11. Show location of hand-off-auto switches at
locally mounted motor starters, control panels, and
motor control centers. Wire all safety controls to
protect circuitry and equipment during both manual
(hand) and auto (DDC) operation.
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SECTION 15910N
Page 8
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