Johnson Controls UNT110-1 User manual

Application Specific Controllers Technical Manual 1628.2
UNT Controller Section
Technical Bulletin
Issue Date 1098
© 1998 Johnson Controls, Inc. 1
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
TO
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 COMMON
7 8
COMMON COMMON
24VAC 24VAC
TRACS
COMMON
R
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