Delta Controls DNT-T221 Installation Guide

Delta Network Thermostat: BACstat II DNT-T221 (Rev 2.2) Installation Guide
Page 6 of 10
Document Edition 1.6
Wiring Diagram
CAUTION:
The network shield and any other bare wires should be bent back and taped 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.
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. 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.
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 Controls DNT-T221 Specifications

General

Brand	Delta Controls
Model	DNT-T221
Category	Thermostat
Language	English