Zone
Zone
VCB-X CONFIGURATION
VCB-X Operator Interface SD
42
Description
Minimum
Default
Maximum
Unoccupied Offsets
Cooling
0ºF
(0
º
C)
30ºF
(16.6ºC)
30ºF
(16.6ºC)
Unoccupied Offsets
Heating
0ºF
(0
º
C)
30ºF
(16.6ºC)
30ºF
(16.6ºC)
Setpoint Screen #4 - Mode Deadband
VCBX Spts ID 101
Mode Deadband
Setpt: 1.0
º
F
This Setpoint is added to and subtracted from the HVAC Mode Setpoints
to determine when the unit enters and leaves a mode of operation.
Description
Minimum
Default
Maximum
HVAC Mode Select
Deadband
1ºF
(.6ºC)
1ºF
(.6ºC)
10ºF
(5.5ºC)
Setpoint Screen #5 - Space Sensor Slide
Adjust
VCBX Spts ID 101
Space Sensor
Slide Adj: 0
If the VCB-X has a Space Temperature Sensor with the Slide Adjust
option installed, the HVAC Mode Enable Heating and Cooling Setpoints
can be offset by the HVAC Mode Sensor Slide Offset Setpoint value.
When the Slide Adjust bar is in the middle, no offset will occur. If the
Slide Adjust bar is moved all the way to the top of the Sensor, the Heat-
ing and Cooling Setpoints will be raised by the Setpoint value you have
entered. If the Slide Adjust bar is moved all the way down to the bottom
of the Sensor, the Heating and Cooling Setpoints will be lowered by the
Setpoint value you have entered.
If the Space Temperature is the SAT Reset Source, then the Slide Adjust
will adjust the HVAC Mode Enable Setpoints and the SAT Reset Source
Setpoints simultaneously.
Description
Minimum
Default
Maximum
Space Sensor
Slide Adjust
0ºF
(0
º
C)
0ºF
(0
º
C)
10ºF
(5.5ºC)
Space Temperature Control of High Percentage Outside Air Units
—
This option allows for Space Temperature control of 100% Outside Air
MUA Units or units with a high percentage of Outdoor Air (normally
50% or greater). For this application you would con
fi
gure “Space Tem-
perature w/High OA %” for the Controlling Sensor option. The intent
of this sequence is to allow Space Temperature control of the unit while
preventing the dumping of hot or cold outside air into the space during
the Space Vent Mode of operation.
Once the Space Temperature is satis
fi
ed, before switching to Vent Mode,
the controller compares the Outside Air Temperature to these Hood On
HVAC setpoints to determine if a continued demand for heating or cool-
ing is required to prevent dumping. If there is no demand, the VCB-X
Controller switches to Vent Mode. If the Outside Air Temperature is
greater than the Hood On HVAC Cooling Setpoint or less than the Hood
On HVAC Heating Setpoint, plus the Occupied Deadband, the VCB-X
Controller will continue mechanical cooling or heating operation and
stage it as necessary to maintain the Vent Mode Supply Air Setpoint
(Calculated to be halfway between the Mode Enable Setpoints). A call
for Heating or Cooling from the Space Sensor will cancel this temper-
ing operation.
Supply Air Tempering
—In the VAV Supply Air Tempering application
(see the
VCB-X Controller Technical Guide
for full details), the unit will
enter the Cooling and Heating Modes based on the outdoor temperature.
The outdoor Heating and Cooling Setpoints are con
fi
gured using the
Hood On OAT Cooling and Heating Setpoints on this screen. In this
application, the economizer can operate in any mode, if necessary, to
achieve the supply air setpoint. Night Setback Heating and Morning
Warm Up are both controlled to the Warm Up Supply Air Setpoint.
NOTE:
For this Supply Air Tempering application, the Heating Supply
Air Setpoint on
Setpoint Screen #21
should be set at least 2°F
below
the
Cooling Supply Air Setpoint.
Description
Minimum
Default
Maximum
Hood On OAT Cool
1ºF
(-17.2ºC)
75ºF
(24ºC)
110ºF
(43.3ºC)
Hood On OAT Heat
1ºF
(-17.2ºC)
70ºF
(21ºC)
110ºF
(43.3ºC)
Setpoint Screen #3 - Unoccupied Offsets -
Cooling & Heating
VCBX Spts ID 101
Unoccupied Offsets
Cooling: 30.0
º
F
Heating: 30.0
º
F
During the Unoccupied Mode of Operation, these Setpoints spread the
HVAC Mode Setpoints out by this user-adjustable amount. Use only
positive numbers for these Setpoints. If you do not want Cooling or
Heating to operate during the Unoccupied Mode, use the default setting
of 30°F for these setpoints.
VCB-X Setpoint Screens
