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