Viconics VBZS Engineering Guide Specifications - Manual (Page 8)

BACnet Zone Controller
VZ7260 Zone Controller
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The zone controller shall be capable of controlling a local VAV analog damper actuator as well as
a local duct furnace and on/off or PWM perimeter heater (if necessary). The zone controller shall
also be capable of auto-changeover based on the central VZ7656 controller signal.
The zone controller shall be capable of modulating the local VAV damper using integrated
damper control logic. The output signal shall be 0-10Vdc to modulate any standard analog
damper actuator. The minimum damper position and maximum damper position shall be
programmed directly on the controller keypad. Control systems that are mounted next to the
damper or require mechanical damper stops are not acceptable.
The zone controller shall have an output to control a duct furnace. The zone controller shall also
have an output for an on/off or PWM (SSR) perimeter heater.
The zone controller shall achieve accurate temperature control using a PI proportional-integral
algorithm. Traditional differential-based controllers are not acceptable.
The zone controller shall communicate with the Rooftop Unit controller VZ7656x1000B using the
BACnet MS_TP protocol on RS485. The zone controller shall have adjustable PI heating and PI
cooling weight from 0% to 100% in 25% increments to allow certain zones a higher priority versus
other zones.
The zone controller shall have a 0-10Vdc input for a CO2 transmitter for monitoring purposes or
to be used in conjunction with the VZ7656E1000B economizer model for CO2 level control.
The zone controller shall be compatible with the VI- PIR “passive infrared” occupancy sensor to
enable a “Stand-by” occupancy mode for additional energy savings.
The zone controller shall have a lockable keypad with the following three lockout levels to prevent
changes to the settings from the keypad:
Lockout Keypad lockout levels. Default: 0 = No Lockout
Levels Occupied temperature setpoints Local Override Only Global Override Access
0 Yes access Yes access Yes access
1 Yes access Yes access No access
2 Yes access No access No access
3 No access No access No access