VCC-X Operator Interface SD
VCC-X CONFIGURATION
27
VCC-X Con
fi
guration Screens
Space Temperature
—Typical recirculating unit using
a Space Temperature Sensor to determine the Heating,
Cooling, and Vent Modes of operation.
Space Temperature with High % OA—
If it is
preferable to use Space conditions (instead of Outside
Air) to control a 100% or high percentage outdoor air
unit, this option allows tempering of the outdoor air in
the Space Vent Mode of operation to prevent dumping of
hot or cold air into the space. See the Sequence of
Operations for details.
NOTE:
If this option is selected,
the Economizer must be set to
Standard Economizer
.
Single Zone VAV
—Recirculating unit using the Space
Temperature Sensor to determine the mode of operation.
Heating and Cooling are controlled to a Leaving Air
Setpoint. Space Temperature resets the Supply Fan VFD
speed to maintain the Space Temperature. Modulating
Heating and Cooling must be used for this operation.
Can be con
fi
gured for CAV Heating using staged Heat.
Con
fi
guration Screen #10 - HVAC Mode Set By
Remote Contact
VCC-X Cnfg ID #
HVAC Mode Set By
Remote Contact: NO
USE < or > TO CHANGE
This option allows separate 24 VAC wet contact closures on the
VCC-X to force the unit into Heating, Cooling, and Dehumidi
fi
ca-
tion modes. If this option is selected, it applies to all three modes,
and all three modes will only be initiated by these contact closures.
If this is con
fi
gured for YES, set the previous screen to Outdoor Air.
See the VCC-X Remote Contact Control section of the Sequence
of Operations in the
VCC-X Controller Technical Guide
for more
details.
Default is NO
.
Con
fi
guration Screen #11 - SAT Reset Source
VCC-X Cnfg ID #
SAT Reset Source
No Reset
USE < or > TO CHANGE
This con
fi
guration option is not available if Single Zone VAV was
selected as the HVAC source. The Supply Air Setpoint can be “au-
tomatically” adjusted based on a selected reset source. This screen
allows you to choose this source.
Default is No Reset.
The available
selections are as follows:
No Reset
—No SAT Setpoint Reset will occur. The SAT
Setpoints
remain
fi
xed.
Space Temperature
—The SAT Setpoints will be
adjusted based on the Space Temperature.
Outdoor Temperature
—The SAT Setpoints will be
adjusted based on the Outdoor Air Temperature.
Return Air Temperature
—The SAT Setpoints will be
adjusted based on the Return Air Temperature.
Fan VFD Signal
—The SAT Setpoints will be adjusted
based on the VFD Signal. This is good for Adjusting the
Setpoints based on the building’s load by looking at the
VFD
speed.
Remote Voltage
—The SAT Setpoints will be
adjusted based on the Remote Supply Air Temperature
Voltage Reset Signal.
If the HVAC Source was set Single Zone VAV in
Con
fi
guration
Screen #9
, then line 3 on this screen will read No SAT Rst Allowed
and the line 4 will be blank.
Con
fi
guration Screen #12 - Reset Rate Interval
VCC-X Cnfg ID #
Reset Interval
Rate...: 30 s
[1 - 255 Seconds]
If you selected a Reset Source in
Con
fi
guration Screen #11
,
enter
a value in seconds between 1-255. This value determines how fast
the Supply Air Temperature Setpoint is adjusted as the Reset Source
changes.
Default is 30 seconds
.
Con
fi
guration Screen #13 - Space Sensor Type
VCC-X Cnfg ID #
Space Sensor Type
None
USE < or > TO CHANGE
If this unit has a Space Sensor installed,
select
Analog
if it is a
wired Thermistor temperature sensor.
Select
E-bus Space/RH
if it is a combination communicating temperature and humidity
sensor.
Select
Receive Broadcast
if the Space Sensor is attached
to a separate device that will broadcast the reading, e.g., GPC-XP
Controller.
Select
Remote Sensor
if using a Sensor connected to a
separate Unit Controller on the same loop (sharing a sensor). You can
select the Unit Controller that will have the Remote Space Sensor
on
Con
fi
guration Screen #14
.
Default is None.
Con
fi
guration Screen #14 - Remote Space
Sensor Board Address
VCC-X Cnfg ID #
Remote Space Sensor
Board Address: 0
If using a Remote Space Sensor (must be chosen in
Con
fi
guration
Screen #13
),
enter
the address of the board it is located on. This Unit
Controller has to be on the same loop as the Controller that will be
sharing the sensor.
