Metasys UNT111-1 - User Manual

Application Specific Controllers Technical Manual 636.3
UNT Controller Section
Technical Bulletin
Issue Date 0398
© 1998 Johnson Controls, Inc.
1
Code No. LIT-6363081 www.johnsoncontrols.com
Introduction Page 5
• Description 5
• Standards Compliance 6
Configuring the Controller 7
• Using HVAC PRO for Windows Configuration Tool 7
• Defining a UNT Control Device Object *7
• Defining a UNT Control Device in Companion Software 9
Installation Procedures 11
• Design Considerations *11
• Tools Needed *11
• Environmental Information 12
• Mounting the Controller *12
• Power Line Wiring Transient Noise Precautions *16
• I/O and Communications Wiring Transient Noise Precautions 18
Wiring Details 19
• Power Source and Loads *19
• Wiring Precautions 21
• Grounding and Isolation UNT110/111, 120/121, 140/141 22
• Grounding and Isolation UNT110/111, UNT120/121,
and UNT140/141 with Separate Load Transformer *23
Unitary Controller (UNT)
* Indicates those sections where changes have occurred since the last printing.

Metasys UNT111-1 Specifications

General

Brand	Metasys
Model	UNT111-1
Category	Controller
Language	English

Summary

Introduction

Description

Overview of the Unitary Controller (UNT) and its applications.

Configuring the Controller

Using HVAC PRO for Windows Configuration Tool

Explains how to use HVAC PRO for configuration tasks.

Defining a UNT Control Device Object

Details the process of defining a UNT device object in the network.

Defining a UNT Control Device in Companion Software

Describes defining a UNT control device using Companion software.

Installation Procedures

Mounting the Controller

Power Line Wiring Transient Noise Precautions

Details precautions for power line wiring to prevent noise.

I;O and Communications Wiring Transient Noise Precautions

Addresses noise precautions for I/O and communication wiring.

Wiring Details

Power Source and Loads

Specifies requirements for power transformers and load connections.

Wiring Precautions

Grounding and Isolation UNT110;111, 120;121, 140;141

Explains grounding and isolation procedures for specific UNT models.

Grounding and Isolation UNT110;111, UNT120;121, and UNT140;141 with Separate Load Transformer

Details grounding and isolation with separate load transformers.

Analog Inputs

Analog Input Configurations

Zone Bus

Zone Bus Description

Sharing a Sensor

Example of Sharing a Sensor Among UNT Controllers

Networking the Controller

N2 Bus Overview

Introduces the N2 Bus and its role.

N2 Bus Characteristics

Installing the N2 Bus

Setting the N2 Address

Guide to setting the N2 address DIP switches.

N2 Wiring to Companion

Connecting the UNT Controller to Companion

Downloading;Commissioning

Commissioning Procedures

Steps for UNT commissioning.

Via Zone Bus

Via N2 Bus

Troubleshooting

Grounding UNT110;111, UNT120;121, and UNT140;141 with an Earth Ground Connection

Troubleshooting the UNT Controller with HVAC PRO for Windows

Troubleshooting using HVAC PRO.

Troubleshooting the N2 Bus

N2 Bus is Offline

Possible causes and actions for N2 Bus offline.

UNT Does Not Come Online

Possible causes for UNT not coming online.

Ordering Information

Appendix A: Precautions for Rooftop Installations

Environmental Information

Electrical Noise in Rooftop Units

Managing electrical noise in rooftops.

Nuisance Resets in Rooftop Units

Resolving nuisance resets.

Considerations for Gas Ignition

Appendix B: UNT100;101

UNT100;101 Terminal Designations

Grounding and Isolation UNT100;101

Isolation for UNT100/101.

Power Transformer Isolation UNT100;101