Occupancy States And Mode Commands; Occupancy State Command; Primary Air State Command - ABB CBV-2U4-3T User Manual

OCCUPANCY STATES AND MODE COMMANDS

OCCUPANCY STATE COMMAND

The Occupancy State Command is written by the master controller to the CBV-2U4-3T(-N). It is one of several
commands in the GroupXOccCode (e.g. Group1OccCode) command. See
on page 46.
• Included in the GroupXOccCode command R/W
Occupied State
The default state of the controller is occupied. If commanded to this mode, the
to the occupied temperature setpoints. Parallel fan powered terminal unit fans will be energized only as
required to maintain the space temperature above the occupied heating setpoint. Series fan powered
terminal unit fans will be energized in the occupied mode.
• OccModeSts
Unoccupied State
When commanded to the unoccupied state, the
mode and control to the unoccupied temperature setpoints. Parallel fan powered terminal unit fans will be
energized only as required to maintain the space temperature above the unoccupied heating setpoint. Series
fan powered terminal unit fans will energize whenever the space temperature falls below unoccupied heating
or rises above unoccupied cooling setpoints (if unoccupied cooling is used).
• OccModeSts
state.

PRIMARY AIR STATE COMMAND

The primary air state command tells the
be used in morning warm-up mode with the associated AHU providing hot air to the VAV boxes. If the
2U4-3T(-N) is configured to use the local supply air temperature sensor to determine Primary Air State, this
command will be ignored in favor of the local command.
• Included in the GroupXOccCode command R/W
• PriAirStateEffCmd
Normal Operation: Cool Air
Under normal circumstances the air handling unit is providing cooling air. This is the default value of the
Primary Air State Command
Warm-up/Heating Operation: Hot Air
When the Primary Air State Command is set to Hot Air for morning warm-up or other air handler heating
state, each CBV-2U4-3T(-N)
occupied heating temperature setpoint.
Note: While Primary Air State is commanded to hot air, accessory heat will not be commanded on.
The primary air damper will control within its minimum and maximum setpoints as described under
Air State: Hot
on page 51.
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CBV-2U4-3T(-N) |
(D186) RO point is on (occ), this indicates the
(D186) RO point is off (Non occ), this indicates the
CBV-2U4-3T(-N)
(D123) RO (Off = Cool, On= Heat)
controller will open its primary air damper as required to return its zone to the
Control Sequence Overview
Writing the Command Mode to the
CBV-2U4-3T(-N)
CBV-2U4-3T(-N) controllers will operate in a night setback
CBV-2U4-3T(-N)
to expect hot or cold air. This command will typically
CBV-2U4-3T(-N) will control
is in the occupied state.
is in the unoccupied
CBV-
Primary
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