Johnson Controls UNT110-1 User manual

Application Specific Controllers Technical Manual 1628.2

UNT Controller Section

Technical Bulletin

Issue Date 1098

Code No. LIT-1628320 www.johnsoncontrols.com

Introduction Page *5

•Description 5

•Standards Compliance 7

Installation Procedures 9

•Design Considerations *9

•Tools Needed *9

•Environmental Information 10

•Mounting the Controller *10

•Power Line Wiring Transient Noise Precautions *14

•I/O and Communications Wiring Transient Noise Precautions 16

Wiring Details 17

•Power Source and Loads *17

•Wiring Precautions 19

•Grounding and Isolation UNT110/111, 120/121, 140/141 *20

•Grounding and Isolation UNT110/111, UNT120/121,

and UNT140/141 with Separate Load Transformer 21

•Terminal Designations 23

•Analog Inputs 28

•Binary Inputs 29

•Binary Outputs (Triac Jumper Information) *29

•Analog Outputs 30

Unitary (UNT) Controller

* Indicates sections where changes have occurred since the last printing.

2 UNT Controller—Unitary (UNT) Controller

•Zone Bus Page 30

•Wiring to Unit Mounted Controls--UNT110/111 and UNT120/121 *31

•Wiring to RLY050/002 Relays *33

•Wiring Sensors and Actuators *35

Networking the Controller 43

•N2 Bus Overview *43

•Installing the N2 Bus *44

•Zone Bus Communications *46

Application Examples 49

•Fan Coil Applications 49

•Unit Vent Applications *51

•Packaged Rooftop Applications *53

•Heat Pump Applications 55

Downloading/Commissioning 57

•Commissioning Procedures 57

•Via Zone Bus 57

•Via N2 Bus 57

Troubleshooting 59

•Hardware Installation Inspection 59

•Tools Needed for Troubleshooting 59

•Installation Checkout *59

•Troubleshooting the UNT Controller with HVAC PRO for Windows *65

•Troubleshooting the N2 Bus 67

•Zone Bus Troubleshooting—HVAC PRO for Windows 68

* Indicates sections where changes have occurred since the last printing.

UNT Controller—Unitary (UNT) Controller 3

Configuring the Controller Page 69

•Using HVAC PRO for Windows Configuration Tool 69

•Defining a UNT Control Device Object *69

•Defining a UNT Control Device in Companion or Facilitator Software 71

Ordering Information 73

•Johnson Controls Code Numbers 73

•Vendor Code Numbers *76

Specifications *77

Appendix A: Precautions for Rooftop Installations 79

•Environmental Information 79

•Installation Requirements *79

•Electrical Noise in Rooftop Units *81

•Nuisance Resets in Rooftop Units *82

•Considerations for Gas Ignition *84

•Considerations for Specific Rooftop Units *88

Appendix B: UNT100/101 91

•What’s Different About the UNT100/101 91

•UNT100/101 Terminal Designations 91

•Grounding and Isolation UNT100/101 93

•Binary Inputs *94

•Binary Outputs 94

* Indicates sections where changes have occurred since the last printing.

4 UNT Controller—Unitary (UNT) Controller

UNT Controller—Unitary (UNT) Controller 5

Introduction

In this document, Facility Management System (FMS) is a generic term,

which refers to the Metasys® Network, Companion™, and Facilitator™

supervisory systems. The specific system names are used when referring to

system-specific applications.

Table 1: Related Documents

Document Title Code Number FAN

Air Handling Unit (AHU) Controller Technical

Bulletin

LIT-6363010

LIT-1628315

636.3

1628.2

ASC and N2 Bus Troubleshooting Technical

Bulletin

LIT-6363003

LIT-1628310

636.3

1628.2

Controller Access Technical Bulletin LIT-6364013

LIT-1628413

636.4 / 637.5

1628.4 / 1637.5

N2 Communications Bus Technical Bulletin LIT-636018

LIT-6281120

LIT-1628120

636

628.1

1628.1

Universal Packaging Module Technical Bulletin LIT-6363070

LIT-1628370

636.3

1628.2

Zone Terminal Technical Bulletin LIT-6363014

LIT-1628330

636.3

1628.2

The Unitary (UNT) Controller is an electronic device for digital control of

packaged air handling units, unit ventilators, fan coils, heat pumps, and

other terminal units serving a single zone or room. It also can be

configured as a generic Input/Output (I/O) device for basic point

monitoring applications when used within a Metasys Network.

You can easily configure point inputs and outputs, and software features to

control a wide variety of Heating, Ventilation, and Air Conditioning

(HVAC) equipment applications. The UNT may be used as a standalone

controller or connected to a FMS.

When connected to a FMS, the UNT provides all point control information

to the rest of the network. The devices communicate through an N2 Bus.

For a smaller facility, the UNT can function as a standalone controller.

Figure 1 illustrates the UNT.

Description

6 UNT Controller—Unitary (UNT) Controller

1 2 3 4 5 6

1 2 3 4 5 6 7 8

BINARY INANALOG INPUTS BINARY OUTPUTS

DSI

1 2 3 4 5 6

ANALOG INPUTS

COMMON

ANALOG INPUTS

1 2 3 4 5 6

BI NARY I NP UT

1 2 3 4

ZONE

STAT

+15VDC

REF

N2-

N2+

24VAC

COM

ZBUS

Z BUS

24 VAC

+15VDC

BI N ARY OUT PUT

1 2 3 4 5 6

COMMON

7 8

COMMON

24VAC

TRACS

COMMON

unt-110

Figure 1: Unitary (UNT) Controller

You may use the UNT for unit ventilator, rooftop, heat pump, or fan coil

applications, or as a generic I/O multiplexer and I/O sideloop control. Each

has a different sequence of operation, all of which are covered in the

HVAC PRO for Windows User’s Manual (FAN 637.5 or 1637.5).

The UNT is available in different hardware sets to suit different

environmental and application needs. Table 2 lists the common features of

the different hardware sets. Table 3 lists the differences by model.

Table 2: Unitary Controller Hardware Characteristics--Similarities

Characteristic Description

6 Analog Inputs RTD temperature elements (1000 ohm nickel, platinum, or silicon)

Adjustable 0 to 2k ohm setpoint potentiometers

0 to 10 VDC or 0 to 2 VDC transmitters

4 Binary Inputs (4) 24 VAC input only (24 VAC provided)

(1) Momentary pushbutton from Zone Sensor for temporary occupancy mode (BI 5)

BI 4 may be used as an accumulator input for frequencies less than 2 Hz.

N2 Bus Isolated

Zone Bus

(see Table 3)

Removable screw terminal block, Light-Emitting Diode (LED) Indication, 8-pin phone jack

on controller

24 VAC Power in

Termination

Removable screw terminal block

N2 Terminations Removable screw terminal block

UNT Controller—Unitary (UNT) Controller 7

Table 3: Unitary Controller Hardware Characteristics--Differences

Characteristic UNT110-1 UNT111-1 UNT120-1 UNT121-1 UNT140-1 UNT141-1

Operating

Temperature

Rating

0 to 52°C

(32 to 125°F)

0 to 52°C

(32 to 125°F)

-40 to 52°C

(-40 to 125°F)

-40 to 52°C

(-40 to 125°F)

0 to 52°C

(32 to 125°F)

0 to 52°C

(32 to 125°F)

Analog Outputs:

0 to 10 VDC

@ 10 mA

None 2 None 2 None 2

Binary Outputs:

24 VAC Triacs @

0.5A or 0.8A if

total power is

limited

Low or High side

Common

Selectable

868686

Zone Bus (see

Table 2)

Additional

6-pin Phone

Jack

Additional

6-pin Phone

Jack

I/O Terminations Quick

Connects

(Spade Lugs)

Quick

Connects

(Spade Lugs)

Quick

Connects

(Spade Lugs)

Quick

Connects

(Spade Lugs)

Fixed Screw

Terminal

Block

Fixed Screw

Terminal

Block

Available

Premounted in

EWC10, with

24 VAC, 50 VA

Transformer

UNT110-101 UNT111-101 UNT140-101 UNT141-101

The UNT complies with the following standards:

●FCC Part 15, Subpart B, Class A

●IEEE 472

●IEEE 587 Category A

●UL 916, UL 864

Standards

Compliance

8 UNT Controller—Unitary (UNT) Controller

UNT Controller—Unitary (UNT) Controller 9

Installation Procedures

Instructions for installing the UNT and its accessories are detailed in this

section. The number and types of components (sensors and actuators) used

with the UNT will vary according to application. Analyze the proposed

installation for logical locations to place these devices and draw an

inventory based on that study. Information on available accessory devices

is in the Ordering Information section of this technical bulletin.

Decide how close the UNT can be to the air handling equipment while still

allowing adequate room for installation and maintenance accessibility.

Also take into consideration any existing power sources or communication

lines. The UNT must be secured to a solid wall and not to any vibrating

surface.

IMPORTANT: Do not mount the UNT near high voltage or

electrically noisy devices. Refer to Appendix A:

Precautions for Rooftop Installations in this technical

bulletin.

For a typical installation, you need the following:

•HVAC PROfor Windows software, current release

•IBM-compatible laptop PC (Personal Computer)

•MicrosoftWindows(3.xx or 95)

•AS-CBLPRO-2 (for Zone Bus downloading, uploading, and

commissioning) or MM-CVT101-0 (for N2 downloading, uploading,

and commissioning)

•two screwdrivers (1/8 in. and 1/4 in. flat-blade)

•drill

•(optional) ZTU100-1 (Zone Terminal unit)

Note: The ZTU100-1supports both UNTxxx-0 and UNTxxx-1

models. The ZTU100-0supports UNTxxx-0models only.

Design

Considerations

Tools Needed

10 UNT Controller—Unitary (UNT) Controller

The installation site of the UNT must meet the following environmental

standards:

•The atmosphere must be free of explosive vapors and escaping gases.

•The atmosphere must be free of exposure to corrosive chemical or salt

vapors that might damage electrical equipment.

•For UNT100/101, UNT110/111, and UNT140/141 series controllers,

the temperature must be maintained between 0 and 52°C

(32 and 125°F) with relative humidity (non-condensing) maintained

between 10 and 90 percent.

•For UNT120/121 series controllers used with outdoor rooftop

applications, the temperature must be maintained between

-40 and 52°C (-40 and 125°F) with relative humidity maintained

between 10 and 90 percent. Some intermittent condensation is

tolerable. This operating temperature range is possible in the

UNT120/121 series controllers due to the heater, coated circuit board,

and BZ-1000-7 size enclosure.

The UNT is commonly packaged either in an enclosure provided by the

installation contractor, or in an AS-ENC100-0 or EN-EWC10-0 enclosure.

The UNT140/141-101 and UNT110/111-101 come mounted in an EWC10

enclosure with a 50 VA transformer. The controller requires a flat

mounting surface area to match its dimensions.

The UNT controller has the following dimensions:

•165 x 163 x 56 mm (6.5 x 6.4 x 2.2 in.) H x W x D without enclosure

•173 x 185 x 119 mm (6.8 x 7.3 x 4.7 in.) H x W x D with the

AS-ENC100-0 enclosure

•229 x 406 x 191 mm (9.0 x 16.0 x 7.5 in.) H x W x D with the

EWC10 or UNTxxx-101 version

Allow enough room to install the enclosure and conduit for wiring

terminations to the controller.

Environmental

Information

Mounting the

Controller

Physical

Dimensions

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