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Andover - Continuum  

i2850; i2851; i2853; i2867; i2887

Secondary Control Units
i285x Series, i28x7 Series
Date Last Saved: 4/1/2009 3:52:10 PM

Product Name(s): i2850; i2851; i2853; i2867; i2887
Product Description: The i285x series and i28x7 series are compact terminal controllers.
Product Application(s): The i285x series and i28x7 series can be configured to control VAV boxes, fan powered induction units, heat pumps, and unit ventilators.
Point Quantity Characteristics
Analog Input (AI): N.A.
Digital Input (DI): N.A.
Universal Input (AI or DI): See Below 0-5 VDC
0-20 mA
Analog Output (AO): See Below 0-10 VDC
Digital Output (DO): See Below SPST Form A (can be configured as Form K)
Universal Output (UO): N.A.
Other: See Below Smart Sensor
Control Unit Model #:AIDIUIDOAOUOOther
i2850 4 3 Form A 1 Form K 1
i2851 4 3 Form A 1 Form K 1
i2853 4 3 Form A 1 Form K 1
i2867 4 5 Form A 2 1
i2887 3 4 Form A 1 Form K 1
A/D Converter Resolution
8 bit
10 bit
12 bit
16 bit
Other 5 mV
D/A Converter Resolution
6 bit
8 bit
10 bit
No Analog Output
Other 50 mV
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? (1) - i2850
none - i2851
(2) - i2853
none - i2867
none - i2887
Integral Damper Actuator? Information not provided
Can controller accept occupant override from thermostat? Yes
Can controller accept occupancy sensor input? Yes
Expander Boards Up to two (2) xP expansion modules can be added to each i2850, i2851, and i2853 only.
Expansion Device Model #AIDIUIDOAOUOOther
DI-8 8
UI-4 4
AO-2 2
AO-4 4
DO-2 2
DO-4 4
Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
1200 to 19.2K baud
External Communication Ports, Speeds and Access Devices
Additional Information (Optional) 254 Infinet device maximum
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
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 Smart Sensor
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
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) Motorola 32-bit Coldfire
Clock Type
Powered, battery-backed
Battery powered
Powered, no battery backing
Clock Synchronization Synchronized through Andover Infinet by network controller
Volatile Memory (RAM) Capacity 128K SRAM - i2850 Series/i2867
512K SRAM - i2887
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? Yes.
Battery Type(s) Replaceable lithium
Battery Life 5 years (typical)
Backup Battery Operating Time Information not provided
Non-Volatile Memory Capacity (EEPROM/Flash)* 1 MB flash
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? Information not provided
What is the controllers role in trending? Information not provided
Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller? Information not provided
When full, does controller automatically send up trend data, overwrite data, or stop logging data? Information not provided
Programming Method(s) Andover Continuum Plain English programming language
Resident vs Non-Resident Program Execution Resident
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 Information not provided
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 Information not provided
Additional Energy Management functions are resident at SI
Additional Programming Functions
DDC Loops (P, PI, PID) Information not provided
Automatic PID Tuning Feature Information not provided
Automatical-Dial Alarm Support Information not provided
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 Information not provided
Volatile memory functions?
Retained for life of backup battery
Other Information not provided
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? Information not provided
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
Control Enclosure Panel mount
Power Supply Required Yes
Voltage 24 VAC, +10-15%, 50/60 Hz
VA 20
Surge Protection MOV protected, fused
Underwriters Laboratories 916
FCC Part 15
CE Yes
LonMark Certified
No - but LonWorks compatible
Information not provided
BACnet (BTL) Certified
Not submitted for testing
Information not provided