FBVi-2U4-4T |
Control Sequence
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Control Sequence Overview
This section provides an overview of the control features applicable to many of the
FBVI-2U4-4T
control
sequences. The sections that follow go into more depth on each subject.
OCCUPANCY COMMANDS
OCCUPIED MODE
The default state of the controller is occupied. If set in this mode, the
FBVI-2U4-4T
will control to the
occupied temperature setpoints. The Occupancy Command can be written by the master controller to
the
FBVI-2U4-4T.
Set Occupied Mode by toggling analog setpoint
occCmd (A269)
= 1
The master controller must write an occupancy state to each
FBVI-2U4-4T
or they will be left in the
default occupied state at all times. If the unit is to operate stand-alone, an internal schedule is available.
See Scheduling.
Standby Mode
This mode will be enabled only when occupancy sensors are used or on network command. Whenever
the scheduled occupancy is OCCUPIED, and the occupancy sensor detects no occupants, this will
offset the occupied heating and cooling setpoints for energy conservation. Once an occupant has been
detected in the zone, the occupied heating and cooling setpoints will return to normal operation.
Standby Mode can also be set manually by toggling analog setpoint
occCmd (A269)
= 2
.
Shed Mode
This mode will be enabled only when scheduled occupancy is OCCUPIED, and the
netShedCmd (A310)
analog setpoint is set to a value above 0%. On a signal from 0-100%, the occupied cooling and heating
setpoints shall reset down to the occupied standby setpoints. Used for energy conservation.
UNOCCUPIED MODE
When indexed to the unoccupied state, the
FBVI-2U4-4T
will control to the unoccupied temperature
setpoints. Set Unoccupied Mode by toggling analog setpoint
occCmd (A269)
= 0
. The damper will be
closed.
Setup Mode
This mode will be enabled only when the scheduled occupancy is UNOCCUPIED. On a rise in zone
temperature above the unoccupied cooling setpoint, the unit shall run in
Setup Mode,
and operate
until the temperature falls below the unoccupied cooling setpoint. On a fall in zone temperature below
the unoccupied cooling setpoint, the unit shall be disabled.
Setback Mode
This mode will be enabled only when the scheduled occupancy is UNOCCUPIED. On a fall in zone
temperature below the unoccupied heating setpoint, the unit shall run in
Setback Mode,
and operate
until the temperature rises above the unoccupied heating setpoint. On a rise in temperature above the
unoccupied heating setpoint, the unit shall be disabled.
Occupied Override
During a scheduled unoccupied period, if the zone needs to be occupied for a short period of time,
pressing a button can initiate a temporary period of occupancy. The amount of time for occupancy can
be set in minutes at the
occOvrTime (A167)
analog setpoint.
•
If a generic zone temperature sensor is wired to UI1, a “close” or “short” to UI1 will initiate the
occupied override.
•
If a CBT Stat is used, pressing the right arrow button twice will initiate the occupied override.
