Application Guide
Delta Network Thermostat: BACstat III
DNT-T221-FCU
Document Edition 1.3
Product Description
The DNT-T221-FCU is a packaged product consisting of a DNT-T221
and an FCM relay module, designed for use with a multi or variable
speed Fan Coil units. The product makes use of the relay board and the
DNT’s analog output in order to control the fan.
The DNT-T221 is an intelligent room thermostat with a custom 3-value,
96 segment, LCD display. The DNT communicates directly on a
BACnet MS/TP network. It is capable of displaying a wide-range of
digital or analog values, including setpoints, temperature, heating and
cooling status, fan speed, valve position and more.
When connected on a BACnet MS/TP network the DNT-T221-FCU
functions as an independent BACnet thermostat. The firmware can be
flash loaded over the network, and have jumper selectable termination
resistors.
The DNT-T221 has 3 inputs, 2 analog outputs, 1 binary output and a
built-in Fan Coil application control strategy. As a result, this BACstat is
capable of stand-alone control when directly connected on an MS/TP
network.
Contents
Application Guide ........................................................................... 1
Contents ....................................................................................... 1
Important Information ................................................................... 2
Setup & Configuration .................................................................. 3
Software & Programming ........................................................... 10
Control Functions ....................................................................... 14
Output Functions & Types .......................................................... 22
OWS Functions .......................................................................... 25
Appendix A: Programming Notes ............................................... 28
Appendix B: Two Pipe Fan Coil Configuration ........................... 29
Appendix C: Four Pipe Fan Coil Configuration .......................... 30
