Delta Controls DNT-T221 User manual

Document Edition 1.5 Page 1 of 9
INSTALLATION GUIDE
Delta Network Thermostat: BACstat II
DNT-T221 (Rev 2.0)
Document Edition 1.5
Product Description
The DNT-T221 BACstat II is an intelligent 4-button room thermostat
with a custom 3-value, 96 segment LCD display that is used with
Delta’s product line of BACnet Application Controllers. It has 2 extra
universal inputs, 2 analog and 1 binary outputs and built-in control
applications, and is capable of displaying a wide range of digital or
analog values, including setpoints, temperature, air flow, heating and
cooling status, fan speed, valve and damper position, and more. It is
also capable of communicating on Delta’s proprietary LINKnet
network or directly on a BACnet MS/TP network. When connected
to an Application Controller on a LINKnet network it provides
programmable remote sensor and expanded I/O capabilities to the
controller. When connected on an MS/TP network it functions as an
independent BACnet sensor with local control capabilities.
Contents
MODEL NUMBERS & ACCESSORIES............................................................................ 2
PACKAGE CONTENTS...................................................................................................... 2
OTHER RELEVANT DOCUMENTS................................................................................. 2
IMPORTANT INFORMATION.......................................................................................... 2
PRODUCT SPECIFICATIONS........................................................................................... 2
BOARD LAYOUT................................................................................................................. 4
JUMPERS.............................................................................................................................. 4
MOUNTING.......................................................................................................................... 5
WIRING DIAGRAM............................................................................................................ 5
POWER.................................................................................................................................. 6
NETWORK CABLING & REQUIREMENTS.................................................................. 6
NETWORK TOPOLOGY.................................................................................................... 7
CAUTIONS & WARNINGS ................................................................................................ 8
COMPLIANCE DECLARATIONS .................................................................................... 8

Delta Network Thermostat: BACstat II DNT-T221 (Rev 2.0) Installation Guide
Page 2 of 9 Document Edition 1.5
Model Numbers
Product Number Product Description
DNT-T221 Standard Model (with default button icons and no backlighting)
DNT-T221B Standard Model (with default button icons, c/w backlighting)
DNT-T221-INT International Model (with international button icons and no backlighting)
DNT-T221B-INT International Model (with international button icons, c/w backlighting)
The appended button icon codes specify the desired icons embossed on the buttons as follows:
[default] Bottom 2 buttons are ▼and ▲(Setpoint Adjust), top 2 are OFF and ON
INT Bottom 2 buttons are ▼and ▲(Setpoint Adjust), top 2 are Oand I– International
Package Contents
•Delta Network Thermostat: BACstat II Product, DNT-T221 (Rev 2.0)
•DNT-T221 (Rev 2.0) Installation Guide
Other Relevant Documents
•RS-485 Network Installation Guide (DOC818-11)
•BACstat II Application Guide (for Configuration & Programming)
•ORCAview Operator Guide (V3.21 or later)
•ORCAview Technical Reference Manual (V3.21 or later)
•Release Notes for V3.21 Firmware, V3.22 Firmware, and BACstats
Important Information
Although BACstats are supported in a system of V3.21 Application Controllers, more features are supported
in a V3.22 system, particularly in regards to LINKnet capabilities and mapped objects.
Product Specifications
Power Requirements
•24 VAC, 4 VA (or about 16 VA if you also use the internally powered triac at full load)
•Class II
Ambient Ratings
•32º to 131º F (0º to 55º C)
•10 to 90% RH (non-condensing)

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Document Edition 1.5 Page 3 of 9
Communication Port
LINKnet Connection
•Communications Speed @ 76,800 bps
•Maximum of 12 devices (depending on the controller)
BACnet MS/TP Connection
•Communications Speed @ 9,600 or 19,200 or 38,400 or 76,800 bps (the default)
•Maximum of 99 nodes per MS/TP segment (50 without a repeater)
Input (Internal Temperature Sensor)
•Thermistor Input – 10,000 ohm @ 77 ºF (25 ºC)
•Accuracy of +/- 0.36 ºF from 32 - 158 ºF (+/- 0.2 ºC from 0 - 70 ºC)
•Display Resolution of 0.1 ºF or ºC
•Stability of 0.24 ºF over 5 years (0.13 ºC)
Inputs (Additional)
•2 Universal Inputs (10 bit), jumper configurable for the following input types:
!0-5 VDC
!0-10 VDC
!10 KΩThermistor
!Dry Contact (using 10 KΩThermistor jumper setting)
Outputs
•2 Analog Outputs
!0-10 vdc @ 20 mA maximum per output
•1 Binary Triac Output
!Switching 24 VAC @ 0.5 Amp maximum per output
!Leakage Current per Triac is 160 µA
!Internally Powered with 24 VAC (so an external power source should not be used)
!Software Configurable for Binary, PWM, Time Proportioned
Technology
•8-bit Processor c/w internal A/D, Flash, and RAM
•3-value LCD c/w icons (96 total segments) and optional backlighting
•4 stylized momentary push buttons with tactile feedback
Device Addressing
LINKnet Connection
•Set via Keypad Configuration Setup
•Address Range: 1 to 12
BACnet MS/TP Connection
•Set via Keypad Configuration Setup, or Software Setup
•Keypad MAC Address Range: 1 to 99 per network segment
•Software Address Range: As per the BACnet standard
•Supports DNA – Delta’s intuitive addressing scheme
Size
•4.5” x 2.75”x 1.25” (11.4 cm x 7 cm x 2.5 cm)

Delta Network Thermostat: BACstat II DNT-T221 (Rev 2.0) Installation Guide
Page 4 of 9 Document Edition 1.5
Weight
•0.1 lb. (50 g.)
PCB Board Layout
Jumpers
10K
5V
10V
INPUT SIGNAL TYPE
The input type is selected by placing the jumper in the correct location on
the Input Type Selector Block. The diagram to the left shows the factory
default selection of 10 KΩ.
10K !For 10 KΩThermistor temperature sensors, as well as Binary
or Dry Contact inputs.
5V !For sensors and other field devices that use a 5 VDC signal.
10V !For sensors and other field devices that use a 10 VDC signal.
NOTE: All field
wiring is terminated
on the Sensor
Backplate mounted
on the wall.
1212312123
+ +
~24GND[-]IP2BO3 GNDAO1AO2 IP3
10V 5V10K
RESET
WARNING
HIGH VOLTAGE
AREA
698144 Rev 1.0
[+]
Input Type Selector
Blocks (IP2)
Triac
Service
Port
High Voltage
Warning - when
devices with
backlighting are
powered on.
CPU
Thermistor
(Other Side of PCB)
Connector Posts
for IP2
Connector Posts
for 24 VAC
Connector Posts
for Network
Connector Posts
for Outputs & IP3
Input Type Selector
Blocks (IP3)

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Document Edition 1.5 Page 5 of 9
Mounting
The BACstat II backplate is designed for mounting directly on a standard North American or European or
Australian electrical box, but may be mounted in other ways as well.
Wiring Diagram
Notes:
1. Note that the DNT-T221 has different wiring connections from the DNS-24 and DNT-T103.
2. If wiring 2 or more outputs, you will need a wire nut to terminate all the outputs to GND.
3. Ensure you use the recommended balanced cable for the network and follow documented RS-485 installation
guidelines for MS/TP or LINKnet networks.
4. Do not use 4-wire multi-conductor cable for network and power, as it will not meet the balanced cable
requirements for the MS/TP or LINKnet networks. Use two separate cables: one for the network and the
other for power.
5. Do not terminate the network shield on the BACstats, but ensure shield conductivity is maintained along the
network from end-to-end with wire nuts (i.e., Marrettes™) as necessary.
6. IMPORTANT: Ensure that the network shield and any other bare wires and their connections are all kept in the
wall behind the backplate to ensure that they do not come into contact with the board electronics and cause a
short. Otherwise, you run the risk of damaging the BACstat.
24~ GND IP2
+
PWR INPUTNET
-
IP3 AO1 BO3GND AO2
OUTPUTSINPUT
24 VAC Power Connection
Network Connection
BACKPLATE
Output 3 (BO) Connection
Input 2 Connection Output 2 (AO) Connection
Output 1 (AO) Connection
Input 3 Connection
Refer to
Note 2 below.

Delta Network Thermostat: BACstat II DNT-T221 (Rev 2.0) Installation Guide
Page 6 of 9 Document Edition 1.5
7. If the same power source is used for more than one device, ensure that the transformer is properly sized for the
rated VA and ensure that the same polarity is observed from device to device. Each BACstat is rated for 2 VA,
not including output loading (which is 0.5 A @ 24 VAC per triac and 20 mA maximum per analog output).
Power
The DNT-T221 BACstat II requires a 24 VAC @ 4 VA power supply – not including output loading for its
internally powered triac – typically an isolated Class II transformer. More than one device – not including
DCUs or V2 products – may be connected to the same transformer, providing the transformer is properly
sized, including line losses, and polarity is observed between controllers (in regards to 24~ and GND). The
transformer must ONLY be used to provide power to other MS/TP or LINKnet devices and field devices
powered through its outputs. Auxiliary field devices (i.e., 4-20 mA devices) that don’t use ½ wave
rectification must be powered separately.
Network & Cabling Requirements
To ensure network stability and reliable communications, particularly at high speeds on the RS-485 MS/TP or
LINKnet networks, it is imperative that you adhere to the following network and cabling requirements:
Item Description
Cabling For MS/TP and LINKnet networks it is recommended that you use network cabling that
matches the following specifications:
•Balanced 100 to 120 ohm nominal impedance Twisted Shielded Pair (TSP) Cable
•Nominal capacitance of 16 PF/FT or lower
•Nominal velocity of propagation of 66% or higher
Topology For MS/TP and LINKnet networks, ensure the cable is installed as a daisy-chain from one
device to the next.
Max. Nodes •MS/TP: The maximum number of devices per MS/TP network without anyrepeaters is 50.
•LINKnet: The maximum number of devices per LINKnet network is 12, depending on the
Application Controller used. Refer to Appendix G in the Technical Reference Manual.
Termination
Boards •MS/TP: A termination board must be installed at each end of each MS/TP network segment
– or two per MS/TP or LINKnet network. Ensure you do not overlook this in laying out
your network architecture and ordering product.
•LINKnet: Termination boards need not be installed for only one or two nodes.
However, install a termination board on each end of the network when there are more
than 2 nodes.
Repeater •MS/TP: A repeater (RPT-768) is not necessary unless more than 50 nodes will be installed
on a network or you need to extend the network beyond 4000 ft (1220 m).
•LINKnet: Repeaters should not be necessary. Ensure the maximum distance is no
more than 1000 ft (300 m).
For more detailed information, including wiring, refer to the RS-485 Network Installation Guide (DOC818-11).

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Document Edition 1.5 Page 7 of 9
Network Topology
1. BACstats Configured as MS/TP Subnet Devices
With V3.21 firmware or higher, one possible MS/TP network architecture has the MS/TP devices configured as
Subnet devices, allowing BACstats to reside on the MS/TP network with other Subnet devices. Note that
V3.21 requires a DCU, while V3.22 or higher may use any System Controller instead.
2. BACstats Configured as LINKnet Devices
The BACstat may reside on LINKnet instead of MS/TP. However, this requires a controller that supports a
LINKnet network for I/O expansion. The maximum LINKnet devices with or without I/O depends on the
controller. All built-in applications must be disabled, but the I/O may be muxed (with V3.22 firmware).
DCU/DSC
(System Device)
BACnet (MS/TP) - Level 3 Network (Subnet)
DAC
(Subnet
Device)
TRM
DAC
(Subnet
Device)
TRM
Level 4
Network
(LINKnet)
!
16x16 Controller
!
12x12 Controller
!
12x8 Controller
!
6x6 Controller
!
Room Controller
!
VAV/VVT Controller
!
Lighting Controller
!
BACstat I
!
BACstat II
(with or without I/O)
!
Input Field Modules
Subnet Devices
!
DSC-1616EX [DCU]
!
DSC-1616(H/E)
!
DSC-1212(H/E)
!
DSC-1280(H/E)
!
DSC-T305
System Devices RS-485
NET1 NET2 NET1 NET2
RS-232
!
BACstat I
!
BACstat II
(with No I/O)
!
BACstat II
(with muxed I/O)
!
I/O Field Modules
LINKnet Devices
TRM
Level 4
Network
(LINKnet)
DFM
DFM
TRM
LINKnet Notes:
1. Ensure you use the recommended
balanced cable.
2. Ensure the cable is installed as a
daisy-chain from one device to the
next. (1000' or 300m maximum).
3. Ensure you install MS/TP terminator
boards when you have more than 1 or
2 devices.
4. Depending on the controller, up to 12
devices are supported on a LINKnet
network, with limitations on how many
of these may have I/O. (Refer to
the Technical Reference Manual.)
ORCAview
OWS
DFM
Ethernet Note:
If the DCU or DSC has Ethernet capability, it may exist on an
Ethernet network with other controllers in the same building, on which
the ORCAview OWS could reside as well (instead of PTP).
PTP
MS/TP Notes:
1. Ensure you use the recommended balanced cable.
2. Ensure the cable is installed as a daisy-chain from one device to
the next (4,000' or 1220m maximum).
3. Ensure you install an MS/TP terminator board (TRM-768) on each
end of each MS/TP network.
4. The maximum nodes per MS/TP network is 50 without a repeater,
or up to 99 with at least one repeater (RPT-768).
Network Diagram
(with V3.22 Firmware)

Delta Network Thermostat: BACstat II DNT-T221 (Rev 2.0) Installation Guide
Page 8 of 9 Document Edition 1.5
Cautions and Warnings
WARNING
The DNT-T221 BACstat II is an Electro-statically sensitive device. However, since the
electronics are contained within the housing, and if sufficient care is taken in handling, proper
ESD protection (ground strap) should be unnecessary.
Compliance Declarations
BACnet Testing Labs
The DNT-T221 BACstat II product is BTL listed (with at least Release 2 firmware).
Refer to http://www.bacnetassociation.org/bacnet_testing.htm for more detailed product listing information.
BACnet is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test
products for compliance with ASHRAE standards. Compliance of listed products to
requirements of ASHRAE Standard 135 is the responsibility of the BACnet Manufacturers
Association (BMA). BTL is a registered trademark of the BMA.
FCC Compliance Information
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one
or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
•Consult the dealer or an experienced radio/TV technician for help.
Industry Canada Compliance Statement
ICES-003 This Class B digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la Classe B Respecte toutes les exigences du Règlement sur le matérial
brouiller du Canada.
UL Compliance Information
This product conforms to the following UL requirements:
•UL916: Energy Management Equipment

Delta Controls
Document Edition 1.5 Page 9 of 9
CE - DECLARATION OF CONFORMITY
according to ISO/IEC Guide 22 and EN 45014
Manufacturer's Name: Delta Controls
Manufacturer's Address: 17850 56th Avenue
Surrey, British Columbia
Canada
V3S 1C7
declares that the product (s):
Product Name: BACstat II - Analog
Model Numbers: DNT-T221
Product Options: All
conforms to the following Product Specifications:
EMC: EN 55022:1994 Radiated and Conducted Emissions Class B
EN 50082-1:1997 Generic Immunity Standard
EN 61000-4-2:1995 + A1:1999 ESD Immunity Level A
EN 61000-4-3:1996 RF Electromagnetic Field Immunity Level A
ENV 50204:1995 RF Electromagnetic Field Immunity (Keyed) Level A
EN 61000-4-4:1995 EFT/Burst Immunity Level B
EN 61000-4-5:1995 Surge Immunity Level B
EN 61000-4-6:1996 Conducted RF Disturbances Immunity Level A
EN 61000-4-11:1994 Voltage Dips / Interruptions Level B/C
Supplementary Information:
The product(s) herewith comply with the requirements of the EMC Directive
89/336/EEC. The product(s) were tested in a typical configuration.
Lee Dickson
Quality Assurance Manager