Trane Symbio 210, Installation, Operation And Maintenance Manual

Page: 40 / 76

40 BAS-SVX084A-EN
Calibration, Operation Modes, and Control
This section provides information about the following:
• “Calibration”
• “Occupancy Modes,” p. 40
• “Space Temperature Control (STC) for Single Duct and Fan-powered Units,” p. 42
• “Ventilation Flow Control (VFC),” p. 50
• “Flow Tracking (FTC),” p. 53
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 enabled, 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-calibration 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 calibration 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.
Occupancy Modes
The Symbio 210 controller has 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 temperature control
• Ventilation flow control (constant volume with discharge air temperature control)
• Flow tracking control (has no occupancy)
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