36 VAV-SVX07F-EN
Calibration, Operation Modes, and Control
This section provides information about:
• “Calibration”
• “Occupancy Modes,” p. 36
• “Space Temperature Control (STC) for Single
Duct and Fan-powered Units,” p. 38
• “Ventilation Flow Control (VFC),” p. 45
• “Flo
w Tracking (FTC),” p. 48
Calibration
The calibration sequence enables the controller to calibrate both, the air valve position and the
water valve position. Calibration takes place if auto-calibration is enabled and either a power cycle
or a transition from occupied to unoccupied has occurred.
Note: Whether or
not auto-calibration is en
abled, the controller initiates calibration on a
communicated application mode command.
The building automation system is responsible for the staggering of the calibration sequence that
is needed between units. When auto-calibrati
on is enabled, and a transition from occupied to
unoccupied occurs, the calibration sequence starts after a fixed delay of three (3) minutes. The
controller effective occupancy mode is unoccupied, but runs as if it is occupied during this three-
minute period.
The mode field of reported unit status reports calibrat
ion when
the controller is in the calibration
sequence. If auto-calibration is disabled, the air valve and water valve are not driven closed and
the flow sensor zero flow voltage reading is not recorded. Refer to following table for calibration
actions.
I/O Device Calibration Action Taken Result After Calibration
Air valve
Drive the air valve closed to the stroke time, plus 20
seconds.
Initialize the air valve position as closed when the
air valve is over-driven.
Flow sensor Record the flow reading when the air valve is fully closed.
Subtract the zero flow reading from all subsequent
readings.
Modulating hot water
reheat
Drive the water valve closed for the stroke time, plus 20
seconds.
Initialize the water valve position as closed when
the water valve is over-driven.
Fan Enabled Enabled
Electric or On/Off hot
water
Disabled Enabled
Occupancy Modes
TGP2 programs have four (4) valid occupancy modes:
• Occupied mode
• Unoccupied mode
• Occupied standby mode
• Occupied bypass mode
Occupied Mode
Occupied mode is the normal (default) operating mode for occupied spaces or daytime operation.
When the controller is in the occupied mode, it uses occupied setpoints and is controlled by:
• Occupied space temper
ature control
• Ventilation flow control (constant volume with discharge a
ir temperature control)
• Flow tracking control (has no occupancy)
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