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Circon - 300 Series  

UHC-302-XMV VAV Terminal Unit Controller

Secondary Control Units
Date Last Saved: 4/13/2005 2:19:52 PM

Product Name(s): UHC-302-XMV VAV Terminal Unit Controller
Product Description: The UHC-302 is a 9-point, LonMark certified, application-specific VAV box controller with interface for external damper motor.
Product Application(s): Single-duct pressure independent or pressure dependent VAV box controller with floating digital interface for in-place external damper actuator, and integral flow sensor. It accomodates series or parallel fan powered terminal units or terminal units without fans. Configurable heating control supports three stages of electric reheat and analog modulating or floating valve control for hot water heat. General purpose side loop provides independent control for additional simple HVAC equipment.
Point Quantity Characteristics
Analog Input (AI): 5 10k Thermistor
Pitot input: 0.03"-1.75" w.c.
Digital Input (DI): N.A.
Universal Input (AI or DI): N.A.
Analog Output (AO): 3 0-10 VDC
Digital Output (DO): 1 Triac (24VAC @ 0.8A)
Universal Output (UO):
Control Unit Model #:AIDIUIDOAOUOOther
UHC-302_XMV 5 3 1
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.
Both AO and DO
DO Only
Indicating status LED on each output?
AO and DO
AO Only
DO Only
Integral Flow Sensor? Yes, Differential air flow sensor:
Pitot input: 0.03" -1.75" w.c. (7.5Pa-438 Pa)
Integral Damper Actuator? No, this product is designed for use with an existing in-place damper actuator. This product comes with two digital outputs to drive actuator. Can be clockwise open or clockwise close. Stroke time is configured via LNS plug-in.
Can controller accept occupant override from thermostat? Yes, via temporary short-circuit on temperature sensor input point.
Can controller accept occupancy sensor input? Yes, via dry contact connected to input point or via network variable.
Expander Boards N.A.
Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
(1)Echelon Free Topology Transceiver (FTT-10A)78 kbps
External Communication Ports, Speeds and Access Devices N.A.
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
Controller Access Devices
Laptop/PC via direct connection to LON network or as remote lightweight client to LNS server
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Zone-Based Interface Access None
Zone Interface Hardware
Zone-Mounted touchpad (thermostat or stand-alone display)
HID (proprietary device)
PDA (3rd party HID, with software)
*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
O&M SupportTAB/Cx Support
Laptop/PC via direct connection to LON network or as remote lightweight client to LNS server
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted)
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID)
Zone-Based port (details below)
Microprocessor(s) Neuron 3150 10 MHz
Clock Type
Powered, battery-backed
Battery powered
Powered, no battery backing
Other software implementation
Clock Synchronization Synched up by a master time source via netowrk variable
Volatile Memory (RAM) Capacity Information Not Provided
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
Is Volatile Memory Supported By Battery? No
Battery Type(s) None
Battery Life N.A.
Backup Battery Operating Time N.A.
Non-Volatile Memory Capacity (EEPROM/Flash)* None
Non-Volatile Memory Uses
Data / Trends / Alarms / Calculation Storage
Configuration / Parameter Storage
Control Programming Storage
Controller Operating System
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? Yes
How many total trend values can be stored? 4 independent trend logs, each capable of storing 12 trend values
What is the controllers role in trending? Controller holds the trend configuration (point to trend, sample interval, criteria for sample, and performs sampling accordingly, recording data in trend log.
Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller? Pulled from controller by trend log viewer plug-in and by Circon's HMI Visual Indicator 3
When full, does controller automatically send up trend data, overwrite data, or stop logging data? Overwrite oldest data
Programming Method(s) Uses a template-based form of programming. Configuration performed on laptop/PC running LNS network management tool and the device-specific configuration LNS plug-in supplied by Circon
Resident vs Non-Resident Program Execution All program execution is controller resident
Resident/Supervisory. This controller supervises the scheduling of other controllers.
Resident/Stand Alone. This controller contains its own schedule. Two resident independent schedules
Non-Resident. This controller is dependent upon another controller for its schedule.
None. This controller has no scheduling features.
Other Controller can also get schedule from another controller via network variable.
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
Specific Pre-Programmed Algorithms Available
None (custom programming only)
None (not applicable)
Optimal Start/Optimal Stop morning warm-up or pre-cool
Peak Demand Limiting/Load Shedding demand limiting
Economizer (enthalpy, dry-bulb, CO2, modulating/2-position, etc.)
Other occupied, standby, and unoccupied setpoints
Additional Energy Management functions are resident at SI
Additional Programming Functions Side loop
DDC Loops (P, PI, PID) PI
Automatic PID Tuning Feature No
Automatical-Dial Alarm Support Yes, in conjunction with Circon SMC-300 Site Management Controller
Does controller perform multiple retries and buffer/store alarm until connection is made? Yes. Controller monitors up to four points for configurable alarm conditions. Configuration performed by LNS plug-in software.
Are multiple destinations possible? Yes, in conjunction with Circon SMC-300 Site Management Controller which can be configured.
Upon controller power loss or hardware failure:
Are network communications affected? No
Is loss recognized on/by the network and alarm reported? Yes, in conjunction with SMC-300
DO and AO response?
Outputs fail to a user pre-specified position
Outputs fail to a normal (unpowered) position
Outputs fail to last position
Volatile memory functions?
Retained for life of backup battery
Upon restoration of power does the controller:
Auto-reboot without operator intervention? Yes
Automatically reset/synchronize the clock? Yes, when synchronized by master clock device via network variable
Update all monitored functions? Yes
Generate an alarm if backup battery is dead? No battery
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.)
Does network automatically reconfigure upon restoration? No
Does network store 'loss of communications' alarm with time of event? Yes, in conjunction with SMC-300
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? No
Control Enclosure PVC (6.75" X 4.75" X 2.0")
Power Supply Required
Voltage 24 VAC
External transformer required.
1.5 A available to power external loads.
VA 12
Surge Protection 2.5 Amp slow-blow fuse (Bussman GMD-2.5A, Littlefuse 23902.5A)
Underwriters Laboratories UL 916 certification for Energy Management Equipment
FCC Part 15, Class A of the FCC rules for Radio Frequency Devices
CE Yes
LonMark Certified
Yes LonMark 3.3, LonMark functional profile: 8502
No - but LonWorks compatible
Information not provided
BACnet (BTL) Certified
Not submitted for testing
Information not provided