Purge Command; Writing The Command Mode To The Cbv-2U4-3T(-N) - ABB CBV-2U4-3T User Manual

PURGE COMMAND

The purge command will put primary airflow setpoint to max Flowrate setpoint and de-energizes all stages of
heat.
• Included in the GroupXOccCode command R/W
• PurgeEffCmd (D226) RO

WRITING THE COMMAND MODE TO THE CBV-2U4-3T(-N)

The master controller must write an occupancy state to each
occupied state at all times.
These writes are to one of the four GroupXOccCode points on each controller.
GroupAddress (A93) may be set to one of 4 groups: 0, 1, 2, or 3. With the default setting of group 0, this box
will respond to writes to
to the corresponding
(A100).
These GroupXOccCodes
multiple different values to be written to the specified
commonly used for fire stop commands being written at priority 1 or purge command at priority 2.
Writing a 1 or 0 to the correct corresponding
in addition, may also contain several other commands as follows:
Group0OccCode (A90) - typical for each of the 4 groups
BIT FUNCTION
0 Occupancy Command
Primary Air Mode
1
Command
Primary Air State
2
Command
3 Standby Command
4 Load Shed Enable
5 Fire Stop Command
6 Purge Command
Note: By default the controllers are set to Occupied with a GroupxOccCode of 1 in all groups.
Sending an Occupied or Unoccupied command
The easiest command to the
This will control occupancy but leave all other functions in their respective default modes.
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CBV-2U4-3T(-N) |
Group0OccCode (A90). If this box is set to a different group, it will respond to writes
GroupOccCode – Group1OccCode
now support the priority array in the
GroupXOccCode
OFF VALUE/ON VALUE
0,1
0,2
0,4
0,8
0,16
0,32
0,64
CBV-2U4-3T(-N) box is simply to write either (1) for Occupied or (0) for Unoccupied.
Control Sequence Overview
CBV-2U4-3T(-N) or they will be left in the default
(A91), Group2OccCode
CBV-2U4-3T(-N)
GroupXOccCode point at various priorities. This is most
will enable or disable the occupancy mode, and
OFF STATE/ ON STATE
Unoccupied / Occupied
Primary Air On / Off
Primary Air State is Cold / Hot
Unoccupied / Standby
Load Shedding is Disabled /
Enabled
Fire Alarm is OK /Fire Stop is
Active
Normal Operation/ Purge Mode
(A92), or Group3OccCode
controllers. This allows for
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