Trane UCM 4.0 and WirelessVAV Communication, UCM 4.0 Installation/ Operator Programming
Installation/
Operator
Programming
UCM 4.0 and
Wireless VAV
Communication
May 2001
VAV-SVX01B-EN
Contents
Chapter 1 – General Information 4
UCM Control Module 4.0 (UMC 4.0)
Specifications
UCM 4.0 Enhancements
UCM 4.0 Features
Shipping
Storage
Chapter 2 – VAV Start-Up/Check-Out Procedure 6
Pre-power Up Checkout for the UCM 4.0
UCM Operational LEDs
Zone Sensor Checkout
Chapter 3 – UCM 4.0 Installation and Wiring 7
UCM 4.0 Power Wiring
Zone Sensor Wiring
Communication Wiring
DIP Switch Settings
Chapter 4 – UCM 4.0 Programming and Operation 14
Typical UCM Operating Behavior
UCM Status
UCM Set Points
UCM Setup
Chapter 5 – Sequence of Operations 24
Single Duct Units
Parallel Fan-Powered Units
Series Fan-Powered Units
Zone Sensor Ffunctions
Flow Sensor
Failure Modes
©American Standard Inc. 1999 VAV-SVX01B-EN
Contents
Chapter 6 – Air and Water Balancing 28
Air Balancing
Water Balancing
Chapter 7 – Wireless VAV Systems 30
Chapter 8 – Trouble-Shooting 38
UCM 4.0 Problems
Wireless Receiver Problems
Chapter 9 – Appendix 42
VAV-SVX01B-EN 3
General
Information
Chapter Overview
This chapter contains information
about the following
Unit Control Module 4.0 (UCM 4.0)
Specifications
UCM 4.0 Enhancements
UCM 4.0 Features
Shipping
Storage
CHAPTER 1: GENERAL INFORMATION
Unit Control Module 4.0
(UCM 4.0)
The UCM 4.0 is a microprocessorbased, Direct Digital Controller (DDC)
for the (Variable Air Volume) VAV
terminal unit. It contains the control
logic to modulate the flow of supply air
through the VAV terminal in response
to the load requirements within the VAV
zone.
The function of the UCM is to control
the VAV terminal unit to vary the
volumetric airflow rate to the zone. VAV
units are available with either
pneumatic, analog electronic, or
microprocessor controls (DDC VAV).
This manual discusses only terminal
units with DDC/VAV controls. Factory
installed DDC/VAV controls are
available with all single duct terminal
units, including parallel fan-powered,
and series fan-powered units. Two
UCMs are required for dual duct units
(one for the heating duct and one for
the cooling duct).
The UCM modulates a VAV’s damper
blade based on a zone temperature,
measured airflow, and set points to
continuously control conditioned air
delivery to the space. The volume of
incoming air is monitored and the
damper adjusts to provide accurate
control independent of the duct
pressure. The damper modulates
between operator set points depending
on space conditions. Additionally, fan
and heat outputs may be energized
depending on the application. Available
inputs include a twisted/shielded
communication link, zone sensor,
auxiliary temperature sensor (optional),
CO2 Sensor (optional), and Occupy/
Unoccupy Sensor (optional), and 24
VAC power.
Specifications
Power Requirements
The UCM 4.0 requires 24 VAC, 50/60 Hz,
and up to 50 VA, depending on the
number of heat outputs (stages), which
consume 10 VA each.
Operating Environments – UCM 4.0
0°– 140°F (0°– 60°C), 10% to 90% relative
humidity, non-condensing
Storage Environments – UCM 4.0
-40°– 150°F (-40°–65.6°C), 10% to 90%
relative humidity, non-condensing
Mounting
Typically, the UCM 4.0 is factory
installed. However, UCM 4.0 is available
with retrofit kits, in which case it must
be field installed.
See Chapter 8 for wireless system
mounting.
Tracer Summit and UCM 4.0
Communications Link Wiring
Communications Link wiring must be
18 AWG twisted shielded pair wire.
Each conductor must be stranded
tinned copper. The maximum total wire
length is 5,000 feet (1,524 m). Refer to
Chapters 2 and 3 for further information
about wire selection.
UCM 4.0 Enhancements
The enhanced VAV UCM is backward
compatible with VariTrane
boxes (VXXD and VXXE) VariTrac
dampers, and VariTrac II dampers.
UCM 4.0 adds support for operation
with VariTrane Series F valves (¼-turn
blade dampers) via 90-second drive
time.
UCM 4.0 adds a second, CO
interfacing, mode of operation to the
auxiliary analog input (TB3-5). This is a 1
to 10 volt DC input with a mapping of
input voltage to CO
of 200 parts per million (PPM) of CO
per volt. The use of this new auxiliary
analog input as an interface to a CO
detector is mutually exclusive with the
use of the input as auxiliary
temperature input. Therefore, the use of
the C0
not recommended for stand-alone
applications requiring auto-changeover.
UCM 4.0 adds a binary 24 VAC, dry
contact input. It can be configured
either as a generic input or as an
occupancy detector input.
UCM 4.0 adds a VariTrac Bypass
Damper mode of operation. In this
®
D VAV
®
2
output data value
2
2
2
interfacing mode of operation is
2
4
VAV-SVX01B-EN
General
Information
mode, supply air temperature and
supply air pressure is made available
on the Com 4 link. The damper position
is a COM 4-control parameter. A Com 4
configurable failsafe position was
added. The supply air temperature uses
a new “s” input (TB3-7). The use of this
new input is mutually exclusive with the
Zone temp input (TB3-1).
UCM 4.0 now assumes the hot water
valve is closed after reset. This prevents
a reset during hot water override from
causing the valve to stop moving. This
also changes the behavior after reset,
when there is a reheat demand, the hot
water valve now opens (from assumed
closed position) to the desired reheat
position.
In a wireless system, the hard-wired
sensor can now be configured as not
present. The hard-wired sensor failures
will not be reported as long as at least
one wireless zone sensor is reporting
valid temperature values.
For standalone units, series or parallel
fan operation will use the unoccupied
fan control when the local unoccupied
request (** function) is received. In
UCM 3.3 and prior, the fan would
operate as if occupied during local
unoccupied request
UCM 4.0 adds a local minimum heating
flow set point. The use of and value of
this set point is configurable.
UCM 4.0 Backward Compatibility
UCM 4.0 can be used to replace UCM I,
UCM II, and UCM III with no compatibility issues. However, if the communicating device (i.e. Command Unit I or
Comfort Manager™ I) is a COM 3
device (1992 or earlier), then you will
need an upgrade chip. The Comfort
Manager chip upgrade is Kit 1511 and
the Command Unit chip upgrade is Kit
1512.
UCM 4.0 Features
Heat and Fan Outputs
All fan outputs are rated for 10 VA each.
Magnetic contactors are rated for 10
VA. Mercury contactors are rated for 12
VA.
Wiring Diagram
Figure 1 shows a typical wiring diagram
for the redesigned UCM hardware. The
new service part number is BRD 2087.
VAV-SVX01B-EN 5
Figure 1. UCM 4.0 Board Layout
Zone Sensor, Auxiliary Sensor, and
Thumbwheel Set Point Calibration
If there is a discrepancy between a
measured temperature and what the
UCM reports, a calibration offset value
can be edited in the UCM setup screen
to correct the displayed value.
Flow Sensor Calibration
If there is a discrepancy between a
measured flow and what the UCM
reports, the measured value can be
entered, which automatically calculates
a calibration multiplier to correct the
displayed value.
Water Valve Override
Each UCM that has proportional or
staged hot water heat outputs can be
edited to override the water valve to its
maximum position.
Ventilation Set Points and Ratio
Calculation
Set point values needed for a space to
satisfy indoor air quality requirements
are provided. A resultant ventilation
ratio can be used to calculate an air
handler’s outside air damper minimum
position or other control strategies.
Water Heat Output Configuration
UCMs that have hot water heat outputs
can be configured for normally open or
normally closed.
Zone Sensor Functions
Zone sensor functions now include: air
valve drive to maximum, use unoccupied set points, timed override, and
cancel timed override.
Slaving of Zone Sensors
Up to three (3) UCM 4.0s may be
connected to a single zone sensor.
Generic UCM Capability
UCM 4.0 can be configured to control
non-Trane VAV boxes.
Shipping
Each VAV product and its service
literature are shipped in the same
package. When unpacking, make sure
that the literature is not lost or discarded with the packing material.
Visually inspect the individual components for obvious defects or damage.
All components are thoroughly
inspected before leaving the factory.
Any claims for damage incurred during
shipment must be filed with the carrier.
Storage
When any component of the VAV
system and/or field installed accessories must be stored for a period of time
prior to being installed, they must be
protected from the elements. The
storage location temperature should be
between -40° – 150°F (-40°– 65.6°C) and
the relative humidity should be 10% to
90%, non-condensing.
The warranty will not cover damage to
the VAV system or controls due to
negligence during storage. A controlled
indoor environment must be used for
storage.
VAV Start-Up/
Check-Out Procedure
Chapter Overview
This chapter contains information
pertaining to the following:
Pre-power up check-out for the UCM
4.0
UCM operational LEDs
Zone Sensor check-out
UCM 4.0 Pre-Power
Check-out
[ ]Check the supply voltage at TB1. Proper
polarity must be maintained. TB1-1 is
the hot side (+) and TB1-2 is the ground
side (-) of the 24 VAC input. The UCM
cannot be powered from a common 24
VAC transformer that is supplying
power to a device containing a fullwave rectifier bridge in its power
supply. The acceptable voltage is 20 to
28 VAC (24 VAC cataloged). However,
voltages at either extreme may result in
increased system instability.
[ ]Verify that communications wiring has
properly been terminated atTB2-1 (+)
and TB2-2 (-). Polarity is very important
on the communications link.
[ ]Verify that the zone sensor connections
are correct as detailed in the UCM
wiring chapter.
[ ]Verify that the proper unit DIP switch
settings have been set on each UCM.
[ ]Verify that the tubing is properly
connected to the transducer.
CHAPTER 2: VAV START-UP/CHECK-OUT PROCEDURE
Light Emitting Diode (LED)
Operations
The UCM has one green LED located
near TB3 and one yellow LED located
near TB2 on the UCM circuit board. These
LED’s are used to help diagnose communication (yellow) or circuit board problems (green).
The green LED (red on older boards) is a
power indicator. It is steady on when the
power is on and the software is
functioning correctly. If it blinks with a 1
second on 1 second off cycle when
power is applied, then the board is not
functioning and must be replaced.
Table 1 - Green LED Power Function Indication
LED State Indication
“On” Board functioning correctly
Blinking Board malfunction (Replace Board)
“Off” Board does not have power
The yellow LED functions as the
communication indicator. The indication
from the yellow LED is as follows:
Table 2 – Yellow LED Communication Indicator
Function
LED State Indication
“On” Incorrect (reversed)
Blinking slowly Communication is occurring on the
approx. 1 link but not for that particular UCM.
blink/sec.
Blinking quickly Communication is occurring on the
(multiple blinks link, specifically with that UCM.
blinks/sec.
“Off” Polarity is correct and no
communication polarity, no
connection, or shorted lines.
communication is occurring on the
link
Zone Sensor Check-out
If an erroneous temperature is being
reported to the UCM, use the Zone
Sensor Temperature-Resistance Table to
verify the integrity of the adjustable set
point potentiometer or sensor. The
resistance should be measured across
the terminals to which the device is
connected.
Note: Disconnect the zone sensor from
the UCM when making the checks listed
in the table below.
Table 3 – Zone Sensor Temperature-Resistance
Table
Temp. Resistance Resistance
(°F) (Ohms) (k Ohms)
55 792 17.0
56 772 16.5
57 753 16.1
58 733 15.7
59 714 15.4
60 694 15.0
61 675 14.6
62 656 14.3
63 636 14.0
64 617 13.6
65 597 13.3
66 578 13.0
67 558 12.6
68 539 12.3
69 519 12.1
70 500 11.8
71 481 11.5
72 461 11.2
73 442 11.0
74 422 10.7
75 403 10.4
76 383 10.2
77 364 10.0
78 344 9.7
79 325 9.5
80 306 9.3
81 286 9.0
82 267 8.8
83 247 8.6
84 228 8.4
85 208 8.2
Thermostat
Thumbwheel Sensor
6
Note: Thumbwheel resistance checks
are made at terminal 2 and 3 on the zone
sensor. Temperature sensor resistance is
measured at terminal 1 and 2 of the zone
sensor.
VAV-SVX01B-EN
UCM 4.0 Installation
and Wiring
CHAPTER 3: UCM 4.0 INSTALLATION AND WIRING
Figures 2 – 5 show wiring diagrams for typical applications of UCM 4.0
Figure 2. Wiring Diagram for Single Duct Units with Field Installed Re-heat
VAV-SVX01B-EN 7
UCM 4.0 Installation
and Wiring
Figure 3. Wiring Diagram for Single Duct Units with Factory Installed Electric Re-heat
8
VAV-SVX01B-EN
UCM 4.0 Installation
and Wiring
Figure 4. Wiring Diagram for Fan-Powered Units with Field Installed Re-heat
VAV-SVX01B-EN 9
UCM 4.0 Installation
and Wiring
Figure 5. Wiring Diagram for Fan-Powered Units with Factory Installed Electric Re-heat
10
VAV-SVX01B-EN
UCM 4.0 Installation
and Wiring
Chapter Overview
This chapter contains information
about the following:
UCM 4.0 Power Wiring
Zone Sensor Wiring
Communication Wiring
DIP switch Settingsire Selection
UCM 4.0 Power Wiring
Power Requirements
Caution: Disconnect all power external
to the unit to prevent injury or death
from electrical shock. Use copper
conductors only. The use of aluminum
or other types of wire may result in
overheating and equipment damage.
Use at least 16 AWG for power wiring
and connect to terminal TB1-1 (+) and
TB1-2 (-). 24 VAC is required to power
the UCM control and has an acceptable
voltage tolerance of 20 to 28 VAC.
Replace the UCM control box cover
after field wiring to prevent any
electromagnetic interference.
NOTE: A dedicated 24 VAC, 50VA NEC
class 2 transformer is recommended to
power the UCM. When powering
multiple UCM’s from one transformer,
polarity must be maintained. Terminal
TB1-1 is designated positive (+) and
terminal TB1-2 is negative (-) to the unit
casing ground. All wiring must comply
with the National Electric Code (NEC)
and local codes. Maximum wire lengths
should be based on NEC specifications.
The power consumption for cooling
only Series F Models (VariTrac and
VariTrane) is 12 VA (4 VA for the air
valve/actuator and 8 VA for the board).
Units with fans and/or reheat outputs
are rated at 10 VA maximum for
magnetic contactors and 12 VA
maximum for mercury contactors for
each output. To determine the total UCM
power requirement, add the power
consumption per stage to the circuit
board power requirement. For example,
a Series F unit containing magnetic
contactors with three stages of reheat
would consume 42 VA.
NOTE: VariTrane and VariTrac cooling only
Series D and E models consume 20 VA
(12 VA for the actuator and 8 VA for the
board). The heating output ratings
remain the same.
Refer to Figure 1 for UCM terminal
locations.
Zone Sensor Wiring
Location and Mounting
A zone sensor in each control zone
should be located in the most critical
area of the zone. Sensors should not be
mounted in direct sunlight or in the
area’s supply air stream. Subdivision of
the zone may be necessary for adequate control and comfort.
Avoid mounting zone sensors in areas
subject to the following:
Drafts or “dead spots” behind doors or
corners.
Hot or cold air ducts.
Radiant heat from the sun or
appliances.
Concealed pipes or chimneys.
Unheated or uncooled surfaces behind
the sensor such as outside walls.
Air flows from adjacent zones or other
units.
Wiring
Each unit must be controlled by a zone
sensor that is designated specifically
for use with the UCM control. Field
wiring for the zone sensors must meet
the following requirements:
Must be 14 to 18 AWG.
Refer to the sensor instructions for
terminal connections.
If local codes require enclosed
conductors, the zone sensor wires
should be installed in conduit. Do not
route zone sensor wires in conduit with
24 VAC or other high power conducting
wires.
Multiple UCM’s Per Zone Sensor
Up to three (3) UCM’s may be connected to a single zone sensor and
thumbwheel set point.
Connect terminal connections TB3-1,
TB3-2, and TB3-3 in parallel (i.e. daisy
chain) from the master UCM to the
slaved UCM(s). NOTE: Proper polarity
must be maintained.
Cut jumper wires W1 and W2 on the
slaved UCM’s (never cut jumper wires
W1 and W2 on the master UCM).
VAV-SVX01B-EN 11
UCM 4.0 Installation
and Wiring
Multiple UCM’s per Auxiliary Duct
Temperature Sensor
Up to three (3) UCMs may be connected to a single auxiliary duct
temperature sensor.
Connect terminal connections TB3-5
and TB3-6 in parallel (i.e. daisy chain)
from the master UCM to the slaved
UCM(s). NOTE: Proper polarity must be
maintained.
Cut jumper wire W4 on the slaved
UCMs (never cut jumper wire W4 on
the master UCM).
Zone Sensor Options
Depending on the zone sensor options
used, a maximum of five wires may be
required to run from the UCM to the
zone sensor. The zone sensor options
are:
Zone sensor only (2 wires) – Part
Number X13510609-01.
Zone sensor with external adjustable
set point and communications jack (5
wires) – Part Number X13510606-01.
Zone sensor with external adjustable
night set back, timed override (TOV) on/
cancel button, and communications
jack (5 wires) – Part Number
X13510606-02.
Sensor with night set back, timed
override (TOV) on/cancel button, and
communications jack (4 wires) – Part
Number X13510606-03.
Digital zone sensor - Part Number
X13511067-01
NOTE: All wiring from the zone sensor to
the Com link must be twisted shielded
pair wiring.
Communication Wiring
Communication Link Wiring
The “Communication Link” is the
communication wiring between Tracer
Summit and all VAV box Unit Control
Modules (UCM). Tracer Summit
be connected to the UCM communication link in a “daisy chain” configuration.
®
can
Note: It is not necessary for each UCM
to be connected to the line in sequential
order by address. Also, multiple
communication links may be run and
terminated at the Tracer Summit.
However, a consistent, documented
wiring path will help troubleshoot
communication problems after
installation.
Field wiring for the communication
link must meet the following
requirements:
1. All wiring must be in accordance with
the National Electrical code and local
codes.
2.Communication link wiring must be at
least 18 AWG twisted shielded pair
wire. Shields must be grounded at the
Tracer Summit or Central Control
Panel (CCP) only. More than one
ground reference will cause
communications failures. Shields
must be daisy chained. Tape the shield
at the last VAV UCM to prevent any
connection between the shield and
ground. Wire specifications are as
follows:
Plenum Cable
Stranded, tinned copper insulated
with extruded FEP. Conductors cabled
and shielded with overall aluminum/
Mylar tape and stranded, tinned
copper drawn wire. Extruded jacket,
300 volt, 150°C NEC 725-2 (b) class 2,
type CL2P, 25 pF/ft.
Non-Plenum Cable
Stranded tinned copper insulated with
polyethylene. Conductors cabled and
shielded with overall aluminum/
polyester tape and stranded, tinned
copper drain wire. Chrome gray PVC
jacket, 300 volt, 60°C NEC type CM, 24
pF/ft.
Wire Capacitance
Wire capacitance must comply with the
following table:
Max. Communication Max.
Link Wiring Length Wire Capacitance
1,000 feet (304.8m) Up to 60 pF/ft. (196.9 pF/m)
2,000 feet (609.6 m) Up to 50 pF/ft. (164.0 pF/m)
3,000 feet (914.4m) Up to 40 pF/ft. (131.2 pF/m)
4,000 feet (1,219.2 m) Up to 30 pF/ft. (98.4 pF/m)
5,000 feet (1,524 m) Up to 25 pF/ft. (82.0 pF/m)
3.The maximum wire length should not
exceed 5,000 feet (1,524 m).
4.Communication link wiring cannot pass
between buildings.
5.A maximum of 63 UCMs can be
connected to each COM Link. Daisy
chaining is a typical configuration.
“STAR” chaining is also acceptable.
Note: Polarity is extremely important
and must be observed on communication link connections.
6.At the VAV box, communication link
wires must be connected to TB2-1, 3 (+)
and TB2-2, 4 (-) terminals on the UCM.
7. Verify that the UCM address is properly
set (DIP switch SW1). See Table 4 for
proper DIP switch settings.
12
VAV-SVX01B-EN
UCM 4.0 Installation
and Wiring
DIP Switch Settings
DIP Switch SW1 contains six switches
for addressing the UCM. These
switches allow a user to set a unique
communication address for each UCM.
Each UCM on a given communication
link must have a unique address in
order for Tracer Summit or the CCP to
communicate to it. Refer to Table 3 for
UCM 4.0 DIP switch settings.
Note: When using Eware to communicate to the UCM, you must add 64 to the
DIP switch address. For example, a UCM
with the DIP switch address set to 1
would be UCM Number 65 in Eware.
Table 4 – DIP Switch Settings for UCM 4.0
UCM Eware
Unit # Address Dip 1 Dip 2 Dip 3 Dip 4 Dip 5 Dip 6
1 65 OFF ON ON ON ON ON
2 66 ON OFF ON ON ON ON
3 67 OFF OFF ON ON ON ON
4 68 ON ON OFF ON ON ON
5 69 OFF ON OFF ON ON ON
6 70 ON OFF OFF ON ON ON
7 71 OFF OFF OFF ON ON ON
872 ONONONOFFONON
9 73 OFF ON ON OFF ON ON
10 74 ON OFF ON OFF ON ON
11 75 OFF OFF ON OFF ON ON
12 76 ON ON OFF OFF ON ON
13 77 OFF ON OFF OFF ON ON
14 78 ON OFF OFF OFF ON ON
15 79 OFF OFF OFF OFF ON ON
16 80 ON ON ON ON OFF ON
17 81 OFF ON ON ON OFF ON
18 82 ON OFF ON ON OFF ON
19 8 3 OFF OFF ON ON OFF ON
20 84 ON ON OFF ON OFF ON
21 85 OFF ON OFF ON OFF ON
22 86 ON OFF OFF ON OFF ON
23 87 OFF OFF OFF ON OFF ON
24 88 ON ON ON OFF OFF ON
25 89 OFF ON ON OFF OFF ON
26 90 ON OFF ON OFF OFF ON
27 91 OFF OFF ON OFF OFF ON
28 92 ON ON OFF OFF OFF ON
29 93 OFF ON OFF OFF OFF ON
30 94 ON OFF OFF OFF OFF ON
31 95 OFF OFF OFF OFF OFF ON
32 96 ON ON ON ON ON OFF
33 97 OFF ON ON ON ON OFF
34 98 ON OFF ON ON ON OFF
35 99 OFF OFF ON ON ON OFF
36 100 ON ON OFF ON ON OFF
37 101 OFF ON OFF ON ON OFF
38 102 ON OFF OFF ON ON OFF
39 103 OFF OFF OFF ON ON OFF
40 104 ON ON ON OFF ON OFF
41 105 OFF ON ON OFF ON OFF
42 106 ON OFF ON OFF ON OFF
43 107 OFF OFF ON OFF ON OFF
44 108 ON ON OFF OFF ON OFF
45 109 OFF ON OFF OFF ON OFF
46 110 ON OFF OFF OFF ON OFF
47 111 OFF OFF OFF OFF ON OFF
48112 ONONONONOFFOFF
49 113 OFF ON ON ON OFF OFF
50 114 ON OFF ON ON OFF OFF
51 115 OFF OFF ON ON OFF OFF
52 116 ON ON OFF ON OFF OFF
53 117 OFF ON OFF ON OFF OFF
54 118 ON OFF OFF ON OFF OFF
55 119 OFF OFF OFF ON OFF OFF
56 120 ON ON ON OFF OFF OFF
57 121 OFF ON ON OFF OFF OFF
58 122 ON OFF ON OFF OFF OFF
59 123 OFF OFF ON OFF OFF OFF
60 124 ON ON OFF OFF OFF OFF
61 125 OFF ON OFF OFF OFF OFF
62 126 ON OFF OFF OFF OFF OFF
63 127 OFF OFF OFF OFF OFF OFF
VAV-SVX01B-EN 13
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