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Table of Contents
Product Description
The DNT-T221 is an intelligent room thermostat with a custom 3-
value, 96 segment, LCD display. The DNT-T221 can communicate on
a BACnet MS/TP network or on Delta's proprietary LINKnet network.
The DNT-T221 can display 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.
When connected on a BACnet MS/TP network the DNT-T221
functions as an independent BACnet thermostat. When connected to a
controller, on a LINKnet network, it provides a programmable remote
sensor and expanded I/O capabilities. This version's firmware can be
flash loaded over the network, and has a termination resistor that is
jumper selectable.
Contents
MODEL NUMBERS ............................................................................................................. 2
PACKAGE CONTENTS ...................................................................................................... 2
OTHER RELEVANT DOCUMENTS................................................................................. 2
PRODUCT SPECIFICATIONS .......................................................................................... 2
PCB BOARD LAYOUT........................................................................................................ 4
JUMPERS .............................................................................................................................. 5
MOUNTING .......................................................................................................................... 5
WIRING DIAGRAM ............................................................................................................ 6
POWER.................................................................................................................................. 7
NETWORK CABLING & REQUIREMENTS .................................................................. 7
NETWORK TOPOLOGY.................................................................................................... 8
CAUTIONS & WARNINGS ................................................................................................ 9
COMPLIANCE DECLARATIONS .................................................................................... 9
Document Edition 1.8
I
NSTALLATION
Delta Network Thermostat: BACstat II
G
UIDE
DNT-T221 (Rev 4.1)
Document Edition 1.8
Page 1 of 10
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Summary of Contents for Delta DNT-T221
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Page 1: Table Of Contents
DNT-T221 (Rev 4.1) Document Edition 1.8 Product Description The DNT-T221 is an intelligent room thermostat with a custom 3- value, 96 segment, LCD display. The DNT-T221 can communicate on a BACnet MS/TP network or on Delta’s proprietary LINKnet network. The DNT-T221 can display 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. -
Page 2: Model Numbers
You need not specify button icons if you want the default, but must specify INT if you want the international button icons. (i.e., DNT-T221-INT). Package Contents • Delta Network Thermostat: BACstat II Product, DNT-T221 (Rev 4.1) • DNT-T221 (Rev 4.1) Installation Guide Other Relevant Documents •... - Page 3 Delta Controls Communication Port LINKnet Connection • Communications Speed @ 76,800 bps • Up to 12 Devices per segment (depending on the controller), only two of which can be DNT or DFM devices BACnet MS/TP Connection • Communications Speed @ 9,600 or 19,200 or 38,400 or 76,800 bps (the default) •...
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Page 4: Pcb Board Layout
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 • 5” x 3.25”x 1” (12.7 cm x 8.3 cm x 2.5 cm) Weight •... -
Page 5: Jumpers
Delta Controls Jumpers 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. For 10 KΩ Thermistor temperature sensors, as well as Binary or Dry Contact inputs. -
Page 6: Wiring Diagram
BACstat. Notes: Note that the DNT-T221 has different wiring connections from the DNS-24 and DNT-T103. If wiring 2 or more outputs use a wire nut to terminate all the outputs to GND. Ensure you use the recommended balanced cable for the network and follow the documented procedures within Delta Controls Wiring and Installation Guidelines for MS/TP or LINKnet networks. -
Page 7: Power
Delta Controls Power The DNT-T221 requires a 24V AC Class 2 power supply rated for at least 15 VA. This includes output loading of the internally powered triac (0.5A max @ 24 VAC) and the two analog outputs (20mA max each). -
Page 8: Network Topology
DNT-T221 (Rev 4.1) Installation Guide Network Topology 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, which allows 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. -
Page 9: Cautions & Warnings
Delta Controls Cautions and Warnings The DNT-T221 BACstat II is an electrostatically sensitive device. An ESD protection (ground strap) should be unnecessary if sufficient care is taken in handling because the electronics are contained within the product housing. Compliance Declarations... - Page 10 DNT-T221 (Rev 4.1) Installation Guide DNT-T221 (Rev 4.1) Installation Guide CE - DECLARATION OF CONFORMITY CE - DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Manufacturer's Name:...