127
VCCX2 Controller Technical Guide
BACnet
®
Properties for the VCCX2 Controller
Parameter Object
Description
Limits
Enthalpy
Enable
Deadband
AV: 85
The OA Enthalpy must be
below the Enthalpy Enable
Setpoint by this amount,
and the OA Enthalpy must
be below the RA Enthalpy
by this amount to utilize the
Economizer.
0.3
BTU/lb.
1.5
BTU/lb.
Maximum
Static
Setpoint Reset
Limit
AV: 86
As the most open VAV
damper rises above 80%,
the static setpoint will reset
up to this maximum limit.
0.01
“WG
3.00
“WG
Minimum
Static Setpoint
Reset Limit
AV: 87
As the most open VAV
damper drops below 80%,
the static setpoint will reset
down to this minimum reset
limit.
0.01
“WG
3.00
“WG
Static
Setpoint
Reset Interval
AV: 88
The Reset Interval is how
often the setpoint reset
calculation occurs. This
must be an infrequent event
so the default is 15 minutes.
10 min
60 min
Cool-Down
Target
Temperature
(See AV:16
for Warm-Up
Target
Temperature)
AV: 89
If Morning Cool-Down
is configured then upon
entering occupied mode, the
Cool-Down Mode will be
activated if the return air is
above this temperature by
one degree.
50°F
10°C
90°F
32.2°C
Warm-Up
Override
AV: 90
Commands the unit into
Morning Warm-Up Mode.
1=Command
Warm-Up Mode
Cool Down
Override
AV: 91
Commands the unit into
Morning Cool-Down Mode
1=Command
Cool-Down Mode
Return Air
High Limit
Protection
(for Voting
Units or CV
Units Only)
AV: 92
If the Return Air
Temperature goes above
this limit, the unit will
revert to Return Air
Control. NOTE: This point
only applies when the
BMS is writing a space
temperature value to the
VCCX2 and that value is
lost.
60
100
Return Air
Low Limit
Protection
(for Voting
Units or CV
Units Only)
AV: 93
If the Return Air
Temperature goes below
this limit, the unit will
revert to Return Air
Control. NOTE: This point
only applies when the
BMS is writing a space
temperature value to the
VCCX2 and that value is
lost.
45
70
Sump Drain
Override
AV: 94
Setting this value to 1 turns
the Sump Drain relay on.
Setting this value to 0 sets
the relay operation to Auto.
1=On
0=Auto
Return
Plenum
Pressure
Setpoint
AV: 95
Current Return Plenum
Pressure Setpoint
BACnet
®
Properties for the VCCX2 Controller
Parameter Object
Description
Limits
Return
Plenum
Pressure
Deadband
AV: 96
Value above and below the
Return Plenum Pressure
Setpoint where no control
change occurs.
Dehum
Lockout
Setpoint
AV: 97
If Outdoor Air temperature
is below this setpoint
Dehumidification Mode
will be locked out
Cooling
Enabled
Status
BI: 1
Status that indicates
Mechanical Cooling is
enabled based on the
Cooling Lockout.
Heating
Enabled
Status
BI: 2
Status that indicates that
Mechanical Heating is
enabled based on the
Heating Lockout.
Economizer
Enabled
Status
BI: 3
Status that indicates
the Economizer is
enabled based on the
Economizer Enable
Setpoint.
Aux Heat
Enabled
Status
BI: 4
Heat Pump Auxiliary Heat
enabled.
Emergency
Heat Enabled
Status
BI: 5
Shows the Emergency
Heat is enabled based on
the Compressor Heating
Lockout.
Fan Proof of
Airflow Status
BI: 6
Proof of Airflow Binary
Input Status
Exhaust Hood
On/Off Status
BI: 7
Exhaust Hood On/Off
Binary Input Status
Remote
Forced
Occupied
Status
BI: 8
Remote Forced Occupied
Mode Binary Input Status
Remote
Forced
Cooling Status
BI: 9
Remote Forced Cooling
Mode Binary Input Status
Remote
Forced
Heating Status
BI: 10
Remote Forced Heating
Mode Binary Input Status
Remote Force
Dehum Status
BI: 11
Remote Force
Dehumidification Mode
Binary Input Status
Bad Supply
Air Sensor
BI: 12
Alarm that indicates a
failure of the Supply Air
Sensor.
Bad Return
Air Sensor
BI: 13
Alarm that indicates a
failure of the Return Air
Sensor.
Bad Outdoor
Air Sensor
BI: 14
Failure of the Outdoor Air
Temperature Sensor.
Bad Space
Temp Sensor
BI: 15
Failure of the Space
Temperature Sensor. If
Space is the controlling
sensor, the unit will shut
down.
APPENDIX C - VCCX2 BACnet
®
VCCX2 BACnet
®
Parameters