VAV-SD; VAV-SD-S; VAV-SD2A; VAViH-SD; VAV-DD; VAV-DD7
Secondary Control Units
VAV-Series Controllers
Date Last Saved: 7/7/2011 4:34:08 PM
Product Name(s):
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VAV-SD; VAV-SD-S; VAV-SD2A; VAViH-SD; VAV-DD; VAV-DD7
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Product Description:
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The VAV-Series SCUs are programmable variable air volume (VAV) terminal equipment controllers that reside on the secondary polling network. Each model can be custom programmed, but is not expandable and has a variety of I/O options for common applications. They perform stand-alone operation and come with libraries of application logic for common VAV terminal equipment.
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Product Application(s):
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The individual VAV-Series controllers are designed for the following VAV air terminal unit configurations:
VAV-SD: Used for VAV terminal units requiring floating point control of external damper and valve. Includes triac outputs for control of terminal fan and stages of electric heat or floating point control of reheat valve.
VAV-SD-S: Same as VAV-SD above, but approved for use in smoke control systems and inputs support only thermistor or dry contact (no support for Microset wall unit).
VAV-SD2A: Same as VAV-SD above, but suited for controlling VAV series fan boxes with a variable speed fan. Also supports Alerton Microtouch, Microset and Microset II wall units.
VAViH-SD: Same as VAV-SD above, but with integrated actuator.
VAV-DD: Used for VAV and dual duct air terminal units requiring floating point control of external dampers. Two integral airflow sensors to provide pressure independent operation of the VAV box. Supports Alerton Microset wall unit. Control algorithms are factory-loaded into flash memory; calibration, programming, etc. stored in nonvolatile flash memory.
VAV-DD7: Same as VAV-DD above, but with three additional switched outputs for control of terminal fan and stages of electric heat or floating point control of reheat valve. Supports Alerton Microtouch, Microset and Microset II wall units.
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Point Quantity
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Characteristics
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Analog Input (AI):
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See below
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Airflow (differential pressure; 0 - 1.2" w.c.) *VAV-DD and VAV-DD7 have two airflow sensors (hot deck and cold deck).
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Digital Input (DI):
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N.A.
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Universal Input (AI or DI):
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See below
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Thermistor (3K or 10K)
Dry Contact (sourced on-board)
Single input (optional) from Microset zone thermostat (Exception: VAV-DD).
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Analog Output (AO):
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See below
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Selectable 0-20mA or 0-10vDC (VAV-SD2A only)
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Digital Output (DO):
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See below
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Triac switch (24vAC/0.5a). Some Triacs are ground-switched for floating damper control (requires 2 Triac pair). Remainder of Triacs are hot-switched for auxiliary equipment (fan, heat, etc.) control.
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Universal Output (UO):
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Other:
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Control Unit Model #: | AI | DI | UI | DO | AO | UO | Other |
VAV-SD
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4
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5
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VAV-SD-S
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4
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5
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VAV-SD2A
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4
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5
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2
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VAViH-SD
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5
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6
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VAV-DD
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4
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4
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VAV-DD7
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4
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7
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A/D Converter Resolution
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D/A Converter Resolution
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HOA switches provided on each output?
Note: These are also available as an add-on from 3rd party vendors.
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Indicating status LED on each output?
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Integral Flow Sensor?
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VAV-DD and VAV-DD7 have two.
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Integral Damper Actuator?
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Model VAViH-SD only. Actuator capacity is 44 lb-in, stroke over 80 - 110 seconds.
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Can controller accept occupant override from thermostat?
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Yes
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Can controller accept occupancy sensor input?
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Yes
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Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
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(1) - BACnet-MS/TP @ 9.6 to 76.8 kbps (polling)
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External Communication Ports, Speeds and Access Devices
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None
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Additional Information (Optional)
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Network Accessing Capabilities via Controller
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Controller Access Devices
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Zone-Based Interface Access
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Microset, Microset II and Microtouch zone sensors have displays and pushbuttons for accessing controller parameters. Wall sensor with interface jack allows Handheld Interface Device access to controller parameters. Not all controllers are compatible with all wall units. Refer to specific models for compatibility.
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Zone Interface Hardware
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*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.
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Microprocessor(s)
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Motorola AZ-60 with on-board flash memeory
VAV-SD-S: Motorola HCMOS processor w/ integral ROM and RAM for processor functions.
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Clock Type
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Clock Synchronization
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Clock synchronization is via standard BACnet Time_Synchronization message by OWS, or by any device which can transmit standard BACnet Time_Synch.
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Volatile Memory (RAM) Capacity
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1.0 kB
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Volatile Memory (RAM) Uses
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Is Volatile Memory Supported By Battery?
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No
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Battery Type(s)
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N.A.
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Battery Life
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N.A.
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Backup Battery Operating Time
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N.A.
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Non-Volatile Memory Capacity (EEPROM/Flash)*
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Information not provided
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Non-Volatile Memory Uses
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Additional Information
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* 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.
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Can trend data be stored in this controller?
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No
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How many total trend values can be stored?
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N.A.
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What is the controllers role in trending?
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Points attached to this controller can be trended, although controller takes no active role in trending.
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Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller?
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When full, does controller automatically send up trend data, overwrite data, or stop logging data?
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N.A.
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Programming Method(s)
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Alerton VisualLogic graphical programming. Optional menu-based set-up/configuration can be performed.
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Resident vs Non-Resident Program Execution
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Local control logic is resident and executed at the control unit. The BCM (SI) controls scheduling and global (system-wide) BAS control strategies.
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Scheduling
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Resident Energy Management
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Specific Pre-Programmed Algorithms Available
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Additional Programming Functions
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DDC Loops (P, PI, PID)
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P, PI, and PID
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Automatic PID Tuning Feature
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No
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Automatical-Dial Alarm Support
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No
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Does controller perform multiple retries and buffer/store alarm until connection is made?
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No
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Are multiple destinations possible?
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No
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Upon controller power loss or hardware failure:
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Are network communications affected?
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No
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Is loss recognized on/by the network and alarm reported?
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Yes
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DO and AO response?
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Volatile memory functions?
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Upon restoration of power does the controller:
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Auto-reboot without operator intervention?
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Yes
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Automatically reset/synchronize the clock?
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No
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Update all monitored functions?
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Yes
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Generate an alarm if backup battery is dead?
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N.A.
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Upon network or communications failure does controller:
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Continue to operate standalone?
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Yes
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Operate with last global settings or user-specified value?
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N.A.
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Do broken network segments continue to communicate within the remaining segment?
(Note: May depend on proper termination of segments for higher speed networks.)
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No
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Does network automatically reconfigure upon restoration?
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Yes
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Does network store 'loss of communications' alarm with time of event?
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No
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Additional Information (optional)
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Self Test Diagnostics
Does controller have internal self-test diagnostics to check:
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Processor failure?
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Yes
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Internal hardware failure?
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Yes
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Open/shortened sensor?
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Yes
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Others?
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Control Enclosure
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Provided as standard feature of product, UL Listed for Plenum Mounting
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Power Supply Required
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Voltage
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24 VAC
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VA
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5VA Minimum (VAViH-SD, VAV-DD7: 10VA Minimum) with no Binary outputs used. 65VA Maximum (VAV-DD7: 100VA Maximum) with all Binary Outputs used.
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Surge Protection
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Provided - Surge and lightning protection provided as standard feature.
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Underwriters Laboratories
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UL 916 PAZX (Energy Management)
UL864 / UUKL Smoke Control System Equipment in U.S. only (VAV-SD-S)
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FCC
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Part 15, Subpart J, Class A
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CE
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EMC Directive 89/336/EEC (European CE Mark) (Exception: VAViH-SD)
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LonMark Certified
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BACnet (BTL) Certified
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Other
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