MIL-HDBK-1003/3
Table 16 (Continued)
Equipment for Multizone HVAC Control System XX
LOOP CONTROL
DEVICE
DEVICE
ADDITIONAL
FUNCTION
NUMBER
FUNCTION
SETPOINT
RANGE
PARAMETERS
50-100o F
SAFETY &
TS-XX04
RETURN AIR
--
--
MAINTENANCE
TEMPERATURE
(CONT'D)
SENSOR
SUPPLY FAN
R-XX01
SUPPLY FAN
--
--
--
START RELAY
CS-XX01
SUPPLY FAN
--
--
--
CURRENT SENSOR
b) Optimized Start Mode: Energize equipment at
maximum capacity at the latest time required for heating up (or
cooling down) the space to normal occupied temperature
conditions. Outside air and exhaust air dampers are closed and
return air dampers are opened.
c) Occupied Mode: Maintain occupied conditions under
all load variations while providing required ventilation. Supply
fan operates continuously. Outside air dampers are opened to the
minimum ventilation air position. If an economizer outside air
cycle is provided, the outside air, return air, and exhaust air
dampers are automatically controlled. An outdoor air dry bulb
sensor disables the economizer cycle and maintains minimum
ventilation air when outside air dry bulb temperature exceeds the
changeover point.
d) Unoccupied Mode: Cycle the equipment to maintain
minimum heating temperature (or maximum cooling temperature) in
the space while providing no ventilation. Outside air and
exhaust air dampers are closed and return air dampers are opened.
e) Maintenance and Safety Mode: A differential
pressure sensor measuring static pressure drop across the filter,
shall initiate an alarm when the pressure drop exceeds the
recommended value.
A freezestat with extended surface sensing element
located ahead of the chilled water coil shall stop the supply
fan, return system components to their fail-safe position, and
initiate a low-temperature alarm if the temperature at any point
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