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Computrols - CBAS  

VT VAV; VAV Small

Secondary Control Units
VAV Controller
Date Last Saved: 5/22/2007 11:37:56 AM

Product Name(s): VT VAV; VAV Small
Product Description: The VT VAV is a Computrols BASNet-compliant digital controller designed as a direct replacement for the Trane model VariTrane VAV box controller. The Small VAV is a Computrols BASNet-compliant digital controller designed for pressure dependent VAV box applications.
Product Application(s): With an integral actuator and pressure sensor, Computrols' VAV controllers are designed for pressure dependent VAV applications in single and dual duct systems.
Point Quantity Characteristics
Analog Input (AI): 3 Thermistor
0-10 VDC
Digital Input (DI): N.A.
Universal Input (AI or DI): N.A.
Analog Output (AO): N.A.
Digital Output (DO): See Below Triac (24 VAC/420mA)
Universal Output (UO):
Other:
Control Unit Model #:AIDIUIDOAOUOOther
VT VAV 3 4 3
VAV Small 3 4 3
A/D Converter Resolution
8 bit
10 bit
12 bit
16 bit
Other Information not provided
D/A Converter Resolution
6 bit
8 bit
10 bit
No Analog Output
Other Information not provided
HOA switches provided on each output?
Note: These are also available as an add-on from 3rd party vendors.
No
Both AO and DO
DO Only
Other
Indicating status LED on each output?
No
AO and DO
AO Only
DO Only
Other
Integral Flow Sensor? Yes
Integral Damper Actuator? Yes
Can controller accept occupant override from thermostat? Information not provided
Can controller accept occupancy sensor input? Information not provided
Expander Boards
Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
EIA 485, serial CBAS protocol
External Communication Ports, Speeds and Access Devices EIA 232, Hand held interface
Additional Information (Optional)
Network Accessing Capabilities via Controller
Access controller only
Access controller plus additional controllers on network segment / LAN
Access all controllers on system
No access available on this controller
Other
Controller Access Devices
Laptop/PC
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Other
Zone-Based Interface Access HHT Connects to the controller via EIA 232 port.
Zone Interface Hardware
Zone-Mounted touchpad (thermostat or stand-alone display)
HID (proprietary device)
PDA (3rd party HID, with software)
Laptop/PC
none
Other
*Note: This section covers the capabilities for accessing the controller or other parts of the network from the controller (i.e. 'bottom-up').
Standard access functionality is covered in the Architecture and Software sections.
**Does NOT include front-end OI functions. See vendor for specific functions available.
Functions Available Through Field Interface**:View ParamsChange ParamsChange
Programs/Logic
O&M SupportTAB/Cx Support
Laptop/PC
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Other
Microprocessor(s) 386 EX, 25 MHz
Clock Type
Powered, battery-backed
Battery powered
Powered, no battery backing
None
Other
Clock Synchronization Information not provided
Volatile Memory (RAM) Capacity 512 K
Volatile Memory (RAM) Uses
RAM use unrestricted
RAM use restricted as shown below
Information Not Provided
Program Execution / Calculation storage
Data / Trends / Alarms storage
Configuration / Parameter storage
Control Programming storage
Others
Is Volatile Memory Supported By Battery? No
Battery Type(s) Lithium battery backup
Battery Life 10 years
Backup Battery Operating Time Information not provided
Non-Volatile Memory Capacity (EEPROM/Flash)* 1 MB Flash ROM
Non-Volatile Memory Uses
Data / Trends / Alarms / Calculation Storage
Configuration / Parameter Storage
Control Programming Storage
Controller Operating System
Other Information not provided
Additional Information
* Items in NV memory are not lost upon power or battery failure. Other types of NV memory such as EPROM, NOVROM, etc. do not directly impact system performance.
Can trend data be stored in this controller? No
How many total trend values can be stored? N.A.
What is the controllers role in trending? N.A.
Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller?
When full, does controller automatically send up trend data, overwrite data, or stop logging data? N.A.
Programming Method(s) CBAS software is used to create control schemes by using Computrols English programming lauguage .
Resident vs Non-Resident Program Execution Resident
Scheduling
Resident/Supervisory. This controller supervises the scheduling of other controllers.
Resident/Stand Alone. This controller contains its own schedule.
Non-Resident. This controller is dependent upon another controller for its schedule.
None. This controller has no scheduling features.
Other Information not provided
Resident Energy Management
Energy management algorithms for this controller can be custom programmed
Pre-programmed/built-in algorithms available, and are fully editable using custom programming
Pre-Programmed/built-in with limited editing via template-based programming
Controller is not typically used for energy management functions
Others
Specific Pre-Programmed Algorithms Available
None (custom programming only)
None (not applicable)
Optimal Start/Optimal Stop
Peak Demand Limiting/Load Shedding
Economizer (enthalpy, dry-bulb, CO2, modulating/2-position, etc.)
Other
Additional Energy Management functions are resident at SI
Additional Programming Functions
DDC Loops (P, PI, PID) No
Automatic PID Tuning Feature Information not provided
Automatical-Dial Alarm Support Yes
Does controller perform multiple retries and buffer/store alarm until connection is made? Information not provided
Are multiple destinations possible? Information not provided
Upon controller power loss or hardware failure:
Are network communications affected? Information not provided
Is loss recognized on/by the network and alarm reported? Information not provided
DO and AO response?
Outputs fail to a user pre-specified position
Outputs fail to a normal (unpowered) position
Outputs fail to last position
Other
Volatile memory functions?
Lost
Retained for life of backup battery
Other
Upon restoration of power does the controller:
Auto-reboot without operator intervention? Information not provided
Automatically reset/synchronize the clock? Information not provided
Update all monitored functions? Information not provided
Generate an alarm if backup battery is dead? Information not provided
Upon network or communications failure does controller:
Continue to operate standalone? Yes
Operate with last global settings or user-specified value? N.A.
Do broken network segments continue to communicate within the remaining segment?
(Note: May depend on proper termination of segments for higher speed networks.)
Information not provided
Does network automatically reconfigure upon restoration? Information not provided
Does network store 'loss of communications' alarm with time of event? Information not provided
Additional Information (optional)
Self Test Diagnostics
Does controller have internal self-test diagnostics to check:
Processor failure? Information not provided
Internal hardware failure? Information not provided
Open/shortened sensor? Information not provided
Others?
 
Control Enclosure Rated as NEMA 1
Power Supply Required
Voltage 24 VAC +/-20%, 50/60 Hz, Class 2 Transformer
VA 75 VA full Load
Surge Protection Information not provided
Underwriters Laboratories Applied for:
UL 916 Energy Management
FCC No
CE No
LonMark Certified
Yes
No
No - but LonWorks compatible
Information not provided
BACnet (BTL) Certified
Yes
No
Not submitted for testing
Information not provided
Other