APPENDIX C - VCB-X BACnet
®
VCB-X Controller Field Technical Guide
102
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
Low Control
Mode Alarm
BI: 29
Occurs when the Control-
ling Sensor Temperature
falls below the Heating
Mode Enable Setpoint
minus the Control Mode
Low Alarm Offset. Applies
only to Space or Return
Air Temperature controlled
units.
Digital
Compressor
Cutoff Alarm
BI: 30
Occurs if the digital
compressor discharge tem-
perature rises above 268°F
or the sensor is shorted. The
compressor is disabled.
Digital
Compressor
Lockout Alarm
BI: 31
Occurs if
fi
ve Digital Com-
pressor Cutoffs occur within
four hours. The compressor
will be locked out.
High Head
Pressure Alarm
BI: 32
Occurs if the Head Pressure
exceeds the acceptable
limit.
Loop Water
Proof of Flow
Alarm
BI: 33
On a WSHP unit, occurs
if water
fl
ow is not proven
within a certain time limit.
Compressors disabled or
prevented from activating.
Low Suction
Pressure Alarm
BI: 34
On a WSHP unit, occurs if
the Suction Pressure falls
below the Low Suction
Pressure Setpoint.
Compressors disabled or
prevented from activating.
Unsafe Suction
Pressure Alarm
BI: 35
On a WSHP unit, occurs if
the Suction Pressure falls
below the Unsafe Suction
Pressure Setpoint. Compres-
sors disabled or prevented
from activating.
Low Leaving
Water
Temperature
Alarm
BI: 36
On a WSHP unit, occurs if
the Leaving Water Tempera-
ture falls below the Low
Leaving Water Temperature
Setpoint while in the Heat-
ing Mode. Compressors
disabled or prevented from
activating.
On Board
Relay 1
Main Fan
BI: 37
Current status of Relay 1 on
VCB-X Main Board.
On Board
Relay 2
BI: 38
Current status of Relay 2 on
VCB-X Main Board.
On Board
Relay 3
BI:39
Current status of Relay 3 on
VCB-X Main Board.
BACnet
®
Properties for the VCB-X Controller
Parameter
Object
Description
Limits
On Board
Relay 4
BI: 40
Current status of Relay 4 on
VCB-X Main Board.
On Board
Relay 5
BI: 41
Current status of Relay 5 on
VCB-X Main Board.
On Board
Relay 6
BI: 42
Current status of Relay 6 on
VCB-X Main Board.
Expansion
Module
Relay 1
BI:43
Current status of
Relay 1 on the EM1
Expansion Module.
Expansion
Module
Relay 2
BI:44
Current status of
Relay 2 on the EM1
Expansion Module.
Expansion
Module
Relay 3
BI:45
Current status of
Relay 3 on the EM1
Expansion Module.
Expansion
Module
Relay 4
BI:46
Current status of
Relay 4 on the EM1
Expansion Module.
Expansion
Module
Relay 5
BI:47
Current status of
Relay 5 on the EM1
Expansion Module.
12 Relay
Expansion
Module
Relay 1
BI:48
Current status of Relay 1 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 2
BI:49
Current status of Relay 2 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 3
BI:50
Current status of Relay 3 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 4
BI:51
Current status of Relay 4 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 5
BI:52
Current status of Relay 5 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 6
BI:53
Current status of Relay 6 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 7
BI:54
Current status of Relay 7 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 8
BI:55
Current status of Relay 8 on
the 12 Relay Expansion
Module.
12 Relay
Expansion
Module
Relay 9
BI:56
Current status of Relay 9 on
the 12 Relay Expansion
Module.
VCB-X BACnet
®
Parameters
Revised 7/30/13
