TEC Zoning Control System for Stand-Alone and BACnet® MS/TP ...

Rooftop Controller User Interface LockoutsThe rooftop controller can be set to lock out specific functions performed by thelocal user. This interface lockout prevents unauthorized inputs to the system,typically in public areas or other areas where certain interface functions need to beprevented. The lockout level is accessed via the Lockout parameter in the InstallerConfiguration Menu. Simply set the appropriate lockout level for each zoneaccording to the system requirements. See Table 13 for details regarding thevarious lockout levels.Table 13: Lockout Level Function DetailsFunctionLockoutLevel 0LockoutLevel 1LockoutLevel 2Global Override Function via Main User Menu Yes Yes NoSystem Mode Access via Main User Menu Yes No NoLocal Schedule Access via Main User Menu Yes No NoLocal Clock Setting via Main User Menu Yes Yes YesRooftop Controller Heating and Cooling Supply Air Temperature LockoutsOne problematic aspect of any VAV zoning control system is high heating orcooling demand when most of the zone dampers are closed. As a result of thissituation, most of the supply air is recirculated through the pressure bypass,leading to extremely hot or cold supply air conditions.To prevent high supply air temperatures (specifically with gas heating systems), setthe discharge air high limit temperature (Dis HL parameter) to the required value.• Default: 120.0°F/49.0°C• Range: 70.0°F/21.0°C to 150.0°F/65.5°C• When adjusting the temperature, press the UP/DOWN arrow key to change thevalue in 0.5F°/0.5C° increments; press and hold the UP/DOWN arrow key tochange the value in 5.0F°/5.0C° increments.To prevent low supply air temperatures (specifically to guard against coil freeze-upwhen a high bypass ratio is in effect), set the discharge air low limit temperature(Dis LL parameter) to the required value.• Default: 45.0°F/7.0°C• Range: 35.0°F/2.0°C to 65.0°F/18.0°C• When adjusting the temperature, press the UP/DOWN arrow key to change thevalue in 0.5F°/0.5C° increments; press and hold the UP/DOWN arrow key tochange the value in 5.0F°/5.0C° increments.38TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked ApplicationsTechnical Bulletin