VCB-X Controller Field Technical Guide
APPENDIX C - VCB-X BACnet
®
97
VCB-X BACnet
®
Parameters
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
Condenser 1
Control Signal
AI:39
Condenser 1 Fan / Water
Valve Signal Status.
Alarm Status
AI: 40
Indicates an alarm
condition.
See Alarm
Group Bits on
page 104.
Return Bypass
Damper
AI: 41
Position of Return Bypass
Damper.
Return Air
Damper
AI: 42
Position of Return Air
Damper.
Superheat #1
Temperature
AI: 43
Superheat 1 Measured by
Expansion Valve Controller.
Superheat #2
Temperature
AI: 44
Superheat 2 Measured by
Expansion Valve Controller.
Expansion
Valve #1
Position
AI: 45
Expansion Valve 1 Position
Expansion
Valve #2
Position
AI: 46
Expansion Valve 2 Position
Return Air
Humidity
AI: 47
Return Air Humidity
Reading.
Sensor Slide
Adjust Effect
AI: 48
Amount Of Current Sensor
Slide Offset
Title 24
Economizer
Feedback
AI: 49
Current position of feedback
from Economizer actuator.
Head
Pressure 2
AI: 50
Current Value of the Head
Pressure 2 Reading.
Condenser 2
Control Signal
AI: 51
Condenser 2 Fan
Occupied
Cooling
Setpoint
AV: 1
If the control temperature
rises one degree above this
setpoint, the control will ac-
tivate the cooling demand.
If the control temperature
is the Supply Air Sensor,
then the cooling demand is
always active.
1
110
Occupied
Heating
Setpoint
AV: 2
If the control temperature
drops one degree below
this setpoint, the control
will activate the heating
demand. If the control
temperature is the Supply
Air Sensor, then there is no
heating demand.
1
110
Hood On
Outdoor
Air Cooling
Setpoint
AV:3
This is the Cooling Mode
Enable Setpoint used only
in Hood On Mode.
1
110
Hood On
Outdoor
Air Heating
Setpoint
AV:4
This is the Heating Mode
Enable Setpoint used only
in Hood On Mode.
1
110
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
Unoccupied
Cooling Offset
AV:5
During the Unoccupied
Mode of Operation, this
Setpoint offsets the
Occupied Cooling Setpoint
up by this user-adjustable
amount. If you do not want
Cooling to operate during
the Unoccupied Mode, use
the default setting of 30°F
for this setpoint.
0
30
Unoccupied
Heating Offset
AV:6
During the Unoccupied
Mode of Operation, this
Setpoint offsets the
Occupied Heating
Setpoint down by this user-
adjustable amount. If you
do not want Heating to
operate during the
Unoccupied Mode, use the
default setting of 30°F for
this setpoint.
0
30
Mode Select
Deadband
AV:7
This value is added to and
subtracted from the HVAC
Mode Setpoints to create a
control deadband range.
0
10
Max Coil
Setpoint
Reset Limit
AV:8
This is the highest that the
Coil Temperature will be re-
set to during Space Humid-
ity Reset of the Coil Suction
Temperature Setpoint. If
no coil temperature reset is
required, this value should
be set the same as the Low
Coil Temperature Setpoint.
35
70
Min Coil
Setpoint Reset
Limit
AV:9
This is the lowest that the
Coil Temperature will be
reset to during Space
Humidity Reset of the Coil
Suction Temperature Set-
point. If no coil tempera-
ture reset is required, this
value should be set the same
as the High Coil
Temperature Setpoint.
35
70
Supply Air
Cooling
Setpoint
AV:10
Supply Air Cooling Set-
point. If Supply Air Reset is
con
fi
gured this is the Low
SAT Cooling Reset Value.
30
80
Supply Air
Heating
Setpoint
AV:11
Supply Air Heating Set-
point. If Supply Air Reset is
con
fi
gured this is the Low
SAT Heating Reset Value.
40
240
Max SAT
Cooling
Setpoint Reset
Limit
AV: 12
If Supply Air Reset is con-
fi
gured this is the High SAT
Cooling Reset Value.
0
100
Revised: 7/29/14
