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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 compatibil-
ity issues. However, if the communicat-
ing 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
General
Information
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 unoccu-
pied 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 dis-
carded with the packing material.
Visually inspect the individual compo-
nents 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 accesso-
ries 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.
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