Zone
Zone
VCC-X CONFIGURATION
VCC-X Operator Interface SD
30
VCC-X Con
fi
guration Screens
Con
fi
guration Screen #28 - Mechanical Heat/
Cool Alarm Delay
VCC-X Cnfg ID #
Mech Heat/Cool
Alarm Delay: 15Min
Enter
a time delay between 0-240 minutes for a delay in the time that
it takes an alarm to be generated.
When Heating or Cooling Mode is
initiated and staging is activated, if the Supply Air Temperature does
not rise or fall 5°F within this time period, a Mechanical Heating
or Cooling failure alarm will be generated. The Alarm is for Status
Reporting only. The HVAC unit will continue to run. This alarm
does not apply if Modulating Cooling or Heating is con
fi
gured.
Default is 15 minutes.
Description
Minimum
Default
Maximum
Mechanical Heat/Cool
Failure Alarm Delay
0 Min
15 Min
240 Min
Con
fi
guration Screen #29 - Economizer Control
Type
VCC-X Cnfg ID #
Econo Control Type
No Economizer
USE < or > TO CHANGE
Default is No Economizer.
Available options are:
No Economizer
Standard Economizer
IAQ Economizer (Economizer with CO
2
Override)
Select Standard Economizer if the HVAC Mode Enable Source is
set to Space Temperature with High Percentage OA.
Con
fi
guration Screen #30 - Title 24 Economizer
VCC-X Cnfg ID #
Title 24
Economizer: NO
USE < or > TO CHANGE
If this unit has Title 24 Economizer operation, this option should be
con
fi
gured as YES.
Default is NO.
Con
fi
guration Screen #31 - Economizer in
Unoccupied Mode
VCC-X Cnfg ID #
Econo Control In
Unoc Mode: NO
USE < or > TO CHANGE
Select
YES for the Economizer to operate in the Unoccupied Cooling
Mode.
Default is NO.
NO
—
You want the Economizer to always remain fully
Closed in the Unoccupied mode.
YES
—
You want to use the Economizer as necessary
during Unoccupied Night Setback cooling calls. It will
be utilized just as it would be in the Occupied mode with
the same outdoor enable temperature. If not being used
for Night Setback Free Cooling, the Economizer will be
closed.
Con
fi
guration Screen #32 - Economizer Enable
Source
VCC-X Cnfg ID #
Econo Enable Source
Drybulb
USE < or > TO CHANGE
This con
fi
guration option is available if the unit was con
fi
gured for
Economizer Control.
Default is Drybulb.
Available options are:
Drybulb
—
If the Outdoor Air Drybulb temperature is
below the Economizer Enable Setpoint, the Economizer
can be used as the
fi
rst stage of cooling.
Wetbulb (OA RH Sensor needed)
—
If the Outside Air
Wetbulb temperature is below the Economizer Enable
Setpoint, the Economizer can be used as the
fi
rst stage of
cooling.
Dewpoint (OA RH Sensor needed)
—
If the Outdoor
Air Dewpoint temperature is below the Economizer
Enable Setpoint, the Economizer can be used as the
fi
rst
stage of cooling.
Con
fi
guration Screen #33 - Economizer Control
Loop Rate & Proportional Window
VCC-X Cnfg ID #
Economizer Control
Rate: 10 s
Prop Window: 10.0
º
F
The Economizer Control rate is the time period between changes to
the Economizer position.
Default is 10 seconds.
The Economizer
Control Proportional Window is the control range of the Modulating
Signal above and below the Active Supply Air Temperature Setpoint.
The size of the Proportional Window will determine how much of a
signal change the controller will make per Time Period for every 1
˚
F
the Supply Air Temperature is from setpoint. The maximum signal
change per time period is 10% which occurs when the Supply Air
Temperature is the full Proportional Window amount from setpoint.
So, with a 5
˚
Proportional Window, if the Supply Air Temperature
is 5
˚
or more from setpoint, the signal change will be 10% per time
period. At 4
˚
difference, the signal change will be 8% per time
