Complete Compiled Specification.pdf - Peck Ormsby Construction

K. The outside air dampers and relief air dampers shall close completely whenever the
supply and return fans are off and/or when the system is in the UNOCCUPIED or
WARMUP modes.
L. A low limit freeze protection thermostat shall stop the fan if the mixed air temperature
drops below 38 F. and the heating hot water system pump(s) shall start.
M. Smoke detectors shall be incorporated into the building fire alarm system in accordance
with NFPA 90A. Both supply fans shall stop if the building fire alarm system is activated.
Refer to the Fire Alarm System.
N. Provide fire alarm interface relays of the proper coil voltage in the fan systems ATC
panels to stop the supply fans whenever the building fire alarm system is in alarm.
Control power to these relays will be provided by Division 16.
0. The night PURGE mode for each fan system shall be initiated by manual commands
from the District. When these commands are received, each fan system shall be
switched to the OCCUPIED mode. Discharge temperature setpoints shall set to 52 Deg
F. PURGE mode shall continue until the temperatures at the fan system space
temperature sensors drops to 74 F.
P. Once the fan systems space temperatures have reached PURGE setpoint, the fans shall
stop until the regularly scheduled OCCUPIED mode begins.
Q. The WARM-UP mode for the building shall be initiated by a manual command from the
District. When this command is received, fan system shall be switched to the
OCCUPIED mode but the outdoor and relief air dampers shall remain closed. WARM-UP
mode shall continue until the return air temperature at both fan systems has risen to 68 F.
R. Once the fan system return air temperatures have reached WARM-UP setpoint, fan
systems shall switch to the regular OCCUPIED mode.
S. In Unoccupied Mode, the supply and return fans start when the lowest space temperature
drops below the night setpoint temperature and runs until the lowest space temperature
rises 50 Deg F above the night setpoint temperature.
T. Provide a differential pressure transmitter with its sensing tips located across fan system
filter bank.
U. Provide software to provide an alarm to the District Host if the filter differential pressure
continuously exceeds a software setpoint for 15 minutes.
4.7 BUILDING PRESSURIZATION
A. Positive building differential pressure of 0.05 inches w.c. is maintained by modulating the
relief air damper at the roof hoods. The relief damper shall modulate to maintain building
static pressure.
B. Upon shutdown of the air handling unit system relief air dampers shall close.
4.8 UNIT HEATER CONTROL
A. A room thermostat shall cycle a normally open heating valve to maintain desired space
temperature. A strap-on aquastat on the supply pipe will not allow the fan to operate
SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION
AUTOMATIC TEMPERATURE CONTROLS 15900-15