Complete Compiled Specification.pdf - Peck Ormsby Construction

VAV supply air damper closed.
b. When the central air handling unit is off, the BAS shall command the
reheat coil hot water valve closed.
c. If the room temperature falls below 50 Deg F. (adjustable), the BAS shall
generate an alarm.
d. Unoccupied Limits
1) Night Low Limit: When the BAS schedule is in the unoccupied
mode the room temperature setpoint shall be reset as follows:
OAT Setpoint
0 Deg F 60 Deg F
32 Deg F 55 Deg F
e. In rooms with convectors, the convector hot water valve shall be
modulated to maintain the night low limit temperature. If a room
temperature falls below the night low limit, the air handler shall be
commanded on and shall continue on and run until the room
temperature rises by 5 degree F (adjustable).
2. Occupied Mode
a. The BAS and the room occupancy sensor shall schedule the VAV to
occupied mode. The central air handling unit must be running before the
VAV will operate in the occupied mode.
b. If the central air handling unit is running before the VAV is scheduled
occupied, the VAV shall be in the warmup/cooldown mode.
c. The cooling setpoint shall be 3 Deg F (adjustable) greater than the
heating setpoint, and the heating setpoint is reset by the following
schedule:
OAT Setpoint
40 F 72 F
68 F 70 F
d. Cooling:
1) The BAS shall modulate the VAV supply air damper to maintain
room temperature of 73 Deg F. Reset with the table above.
2) The supply damper shall be modulated towards the maximum
position as the room temperature rises above setpoint and shall
be modulated towards the minimum position as the room
temperature drops below the setpoint.
3) The VAV shall operate independent of the supply air pressure.
e. Ventilation:
1) In the occupied mode the VAV box shall open to the Ventilation
minimum setpoint.
f. Heating:
1) When the room temperature drops below the heating setpoint,
the VAV Box shall be considered to be in the heating mode.
2) The BAS shall modulate VAV supply air damper to maintain the
heating minimum flow (CFM).
3) When the room temperature drops below the heating setpoint,
the BAS shall modulate the hot water reheat valve to maintain
the heating setpoint of 70 Deg F. (adjustable). The BAS shall
start to open the hot water reheat valve when the room
temperature drops below 70 Deg F. The BAS shall modulate the
hot water reheat valve to the full open position when the room
temperature drops below the heating setpoint by 1 Deg
F. (adjustable). The VAV box shall modulate open to the heating
SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION
AUTOMATIC TEMPERATURE CONTROLS 15900-11