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occupancy detector, the VAV UCM will
revert back to unoccupied mode.
However, when configured for an
occupancy sensor and
communications are active, loss of
communications does not result in the
VAV UCM defaulting to occupied mode.
Unit Size
The unit size range is dependent on the
unit type selected.
Use Local Heat Set Point (Default is No)
When "No" is selected, the UCM will
use the Min Heating Flow. When "Yes"
is selected, the UCM will use the Min
Local Heat Flow Set Point. See UCM set
points for more information regarding
Min Heating Flow and Min Local Heat
Flow Set Points.
Thumbwheel Set Point
If DISABLE is selected, the following
features of the UCM's zone sensor
thumbwheel functions will be disabled:
set point; ability to generate a "drive to
max" command; ability to generate a
"go unoccupied" command.
Note: Disabling thumbwheel functions
does not disable the ON/Cancel
pushbutton feature.
Aux Input Select (Defaults to Aux Tmp
Sensor)
This entry determines the configuration
of the A/CO
input on terminal TB3-5 of
2
the UCM. Selecting AUX TMP SENSOR
configures the input to use an auxiliary
temperature sensor. Selecting CO
Sensor configures the input to use a
CO
sensor.
2
Parallel Fan Control
This entry will determine if a parallel fan
will be controlled based on zone
temperature or on flow conditions. If
"Parallel fan control" has been edited to
"DEG" the fan control offset will be
entered as a temperature offset (2° –
10°F) which will be added to the heating
set point. If "Parallel fan control" has
been edited to "FLOW" this line will be
entered as a percent (0 to 100%) if the
unit is a VariTrane unit. The entry field on
this line will appear as "—" if the unit
does not have a parallel fan.
22
UCM Programming
and Operation
Note: See the Sequence of Operations
section of this manual for details on
parallel fan operation.
Auxiliary Temperature
The current auxiliary temperature will
be displayed on this line. If the auxiliary
temperature sensor has failed or is not
present, "—" will be displayed instead
of the temperature.
Output "X" Normally
These lines will always be shown as
Normally Open or Normally Closed, but
can only be edited if the heat type is "1-3
stages hot water" . If the unit has a fan,
output 3 will be set to Normally Open
and will not be editable. If output 3 is
not controlling a fan, it is editable for
proportional hot water units. If the unit's
heat type is changed, all of the outputs
will be set Normally Open.
Aux Temp Calibration
This line allows an auxiliary tempera-
ture calibration offset to be entered with
a range of -10.0°– 10.0°F (-5.6° – 5.6°C).
The UCM will add the offset to the value
being read by the UCM's auxiliary
temperature sensor. For example, if the
auxiliary temperature sensor is indicat-
ing that the temperature is 74°F (23.3°C),
and the auxiliary temperature calibra-
tion offset is -1.5°F (-0.8°C), the actual
temperature used by the UCM and
reported to the ICS will be 72.5°F
(22.5°C).
Wired Zone Temperature
This is the temperature being reported
2
by the zone sensor. The temperature
will be displayed with the temperature
calibration offset applied. If the tem-
perature sensor has failed or been
disabled, "—" will be displayed instead
of the temperature.
Wired Zone Temp Calib
The zone sensor calibration offset has a
range of -10° – 10°F (-5.6° – 5.6°C). The
temperature will be displayed with the
temperature calibration offset applied.
The UCM will add the offset to the value
being read by the UCM's zone tempera-
ture sensor. For example, if the tem-
perature sensor is indicating that the
temperature is 74.0°F (23.3°C) and the
temperature calibration offset is -1.5°F
(-0.8°C), the actual temperature used by
the UCM and reported to the ICS will be
72.5°F (22.5°C).
Max Hot Water Override
Entering YES for this line forces the
UCM to turn on all of its hot water
outputs or drive open its proportional
hot water valve. This may be useful for
water system balancing (see Chapter 7
for water balancing information).
Only units with the following heat types
will be affected:
— 1-3 stages hot water
All three of the heat outputs will be
energized. If the unit has a fan, output 3
will not be affected.
•
Proportional hot water and aux. output
The hot water valve connected to
outputs 1 and 2 will be driven open.
Output 3 will energize if it is not
controlling a fan.
The UCM will maintain the "Max hot
water override" condition over power
failures. The only way to cancel a "Max
hot water override" is by editing this
line to NO.
If the unit does not have "1-3 stages hot
water" or "proportional hot water and
aux. output" , "—" will be displayed
instead of the ON/OFF descriptor.
Note: Unit heat must be enabled in
order for the Max hot water override to
be effective.
Wired Thumbwheel Set Point
This is the set point being reported by
the zone sensor. The set point will be
displayed with the set point calibration
offset applied. If the zone sensor has
failed or been disabled, "—" will be
displayed instead of the set point.
Flow Override
The flow override entered on this line
has the highest priority of all the flow
overrides (group, binary inputs, or
upper level system functions). Possible
entries include AUTO, OPEN, CLOSED,
MIN, and MAX. When a non-auto flow
override is edited from the UCM level,
the flow override will be maintained
over power failures. See Sequence of
Operations for more information.
VAV-SVX01B-EN
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