23 36 00 AIR TERMINAL UNITS

.01 VAV Boxes

1. Specify non-fibrous "IAQ" type internal insulation.
2. Include optional low leakage, gasketed, factory installed access door between damper and heating coil for access and cleaning.
3. VAV boxes shall be supplied without the manufacturer's controller.
   1. The controller/actuator and temperature sensors shall be by the BAS vendor.
   2. Include requirement for averaging velocity grid inlet airflow sensor.  Single point type not acceptable.
4. VAV Box schedule shall include minimum and maximum cfm's, NC levels, and coil ratings.
   1. Selection of VAV terminal units:  Overhead heating shall limit supply air temperature to a maximum of 20 degrees above room heating setpoint to avoid room air stratification leading to complaints of cold feet and warm head.  Affect coil sizing and min-max heating cfm.  Define occupied and unoccupied heating and cooling min/max airflows, not just general min and max.  Needs to be fully defined to do programming setup of individual DDC controllers. Coordinate with control sequence.
5. When multiple boxes are used to serve a single zone, all shall be controlled from a single thermostat.
6. Location of all boxes shall be accessible for maintenance.
7. Electrical coordination:
   1. The Mechanical, Electrical, and Controls Designers shall coordinate with the intent to separate terminal unit control power from non-control power to ensure terminal unit control functions are maintained whenever an electric heating coil or terminal fan is isolated for service. The Designer and Contractor are responsible for coordinating this design intent with the final equipment selections.
   2. Where permissible by building code, the electrical source providing control power shall be provided with a separate disconnect from the electrical source providing non-control power.