VCB-X Controller Field Technical Guide
APPENDIX C - VCB-X BACnet
®
101
VCB-X BACnet
®
Parameters
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
Reheat
Enabled Status
BI:4
Modulating Hotgas Reheat
Enabled.
Emergency
Heat Enabled
Status
BI:5
Shows the Emergency
Heat is enabled based on
the Compressor Heating
Lockout.
Bad Supply
Air Sensor
BI: 6
Alarm that indicates a
failure of the Supply Air
Sensor.
Reserved For
Bad RAT
Sensor
BI: 7
Not Currently Used.
Bad Outdoor
Air Sensor
BI: 8
Failure of the Outdoor Air
Temperature Sensor.
Bad Space
Temp Sensor
BI: 9
Failure of the Space Tem-
perature Sensor. If Space is
the controlling sensor, the
unit will shut down.
Missing EM1
Expansion
Module
BI: 10
EM1 Module is con
fi
gured
but not detected.
Bad Coil
Pressure
Sensor
BI: 11
Failure of the Coil Pressure
Sensor. Will shut unit down.
Bad CO2
Sensor
BI: 12
Failure of the CO2 Sensor.
Bad Discharge
Sensor
BI: 13
Failure of the Digital Com-
pressor Discharge
Temperature Sensor.
Bad Outdoor
Air
fl
ow
Sensor
BI: 14
An Outdoor Air
fl
ow
Sensor is con
fi
gured, but
not detected.
Bad Exhaust
Air
fl
ow Sensor
BI: 15
An Exhaust Air
fl
ow
Sensor is con
fi
gured, but
not detected.
Bad Supply
Air
fl
ow Sensor
BI: 16
A Supply Air
fl
ow Sensor is
con
fi
gured, but not detected.
Bad Return
Air
fl
ow Sensor
BI: 17
A Return Air
fl
ow
Sensor is con
fi
gured, but
not detected.
Bad or
Missing
Reheat Board
BI: 18
The MHGR board is con
fi
g-
ured but not detected.
Bad or
Missing
MODGAS
Board
BI: 19
The MODGAS board is
con
fi
gured but not detected.
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
Bad or
Missing 12
Relay
Expansion
Board.
BI: 20
The 12 Relay Expansion
Board is con
fi
gured but not
detected.
Mechanical
Cooling Alarm
BI: 21
Compressor Relays are
enabled but the Supply Air
Temperature has not fallen
5°F w/in a user-adjustable
time period. This does
not apply for Modulating
Cooling.
Mechanical
Heating Alarm
BI: 22
Heating Mode has been
initiated but the Supply Air
Temperature has not risen
5°F w/in a user-adjustable
time period. This does not
This does not apply for
Modulating Heating.
Fan
Proving Alarm
BI: 23
Alarm that indicates an Air-
fl
ow failure from the Main
Fan. Heating and Cooling
will be disabled.
Dirty Filter
Alarm
BI: 24
Alarm that indicates
the
fi
lters are dirty.
Emergency
Shutdown
Alarm
BI: 25
Alarm that indicates
that Emergency Shutdown
has been activated. Will
shut the unit down.
High Supply
Temp Cutoff
Alarm
BI: 26
The Supply Air has risen
above the Hi SAT Cutoff
Setpoint. Heating stages
begin to deactivate and the
fan continues to run.
Low Supply
Temp Cutoff
Alarm
BI: 27
The Supply Air has fallen
below the Low SAT Cutoff
Setpoint and cooling stages
will begin to deactivate. If the
unit is in Economizer, Vent,
or Heating Mode the Supply
Fan will shut off.
High Control
Mode Alarm
BI: 28
Occurs when the Control-
ling Sensor Temperature
rises above the Cooling
Mode Enable Setpoint plus
the Control Mode High
Alarm Offset. Applies only
to Space or Return Air
Temperature controlled
units.
