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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
4
General
Information
CHAPTER 1: GENERAL INFORMATION
Unit Control Module 4.0
(UCM 4.0)
The UCM 4.0 is a microprocessor-
based, 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
output data value
2
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
interfacing mode of operation is
2
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
2
2
VAV-SVX01B-EN
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