Entering And Exiting The Service Mode - Trane VAV-UCM 4.2 Installation & Maintenance Manual

UCM Programming and Operation
Air Valve/Damper
Air Flow
PWM Heat
Other

Entering and Exiting the Service Mode

Controllers must be online and in the service mode to receive an override. The service mode
disables control from Tracer and places Rover/Comm4 in command of the controller. Controllers
that are in the service mode appear in bold in the device tree on the left side of your screen. More
than one controller can be in the service mode at one time.
You can place a controller in the service mode manually or let Rover/Comm4 do so automatically
when you start an override. Controllers exit the service mode automatically 15 minutes after the
last override or when you manually release them.
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Drive time: This adjustment can be used to match the DDC UCM 4.2 to the actuator drive time.
The air valve damper actuator drive time will be automatically adjusted to the type of Trane Unit
type selected.
Min Drive Time: Displays the minimum time that the output can be driven. This value restricts
the change in the mechanical output. Until the desired change in position will take at least the
minimum drive time, the output will not be changed.
KP: This is an internal factor used by the PID control loop that modulates the air valve or
damper. The value is predetermined by unit type and unit size.
Reset Time: This is an internal factor used by the PID control loop that modulates the air valve
or damper. The value is predetermined by unit type and unit size.
KP: This is an internal factor used by the PID control loop that modulates the terminal heating.
The value is predetermined by unit type and unit size.
Reset Time: This is an internal factor used by the PID control loop that modulates the terminal
heating. The value is predetermined by unit type and unit size.
UCM 2/3 Trane Box: Shows whether the UCM is configured as a Trane box. By default only
a box configured as generic is not a Trane box.
Cmd Unit I / Comfort Manager: Select the check box to use the VariTrane D best fit
configuration. Clear the check box to use the Generic best fit configuration. This check box
applies to UCM versions 4.0 and higher. When a VariTrane F style UCM or VariTrac - Rectangular
UCM is programmed, it is also configured to its best fit to a generic style or VariTrane D style
box. Using this method, newer boxes can be used as replacements or to expand legacy
systems.
Note: The Command Unit I and Comfort Managers do not recognize a generic unit type.
Valve Gain: This is an internal factor used by the PID control loop that modulates the air valve
or damper. The value is predetermined by unit type and unit size.
Water Valve Drive Time: The drive time, in seconds, to stroke the water valve from 0 to 100%.
Valve Flow Constant: This is an internal factor used by the PID control loop that modulates
the air valve or damper. The value is predetermined by unit type and unit size.
IAQ Multiplier: This value is usually sent by the ICS system to adjust the minimum flow
setpoint. When the value is greater than 1.0, the VariTrac energy saver feature to ignore
minimum flow is ignored and the minimum flow is enforced at the unit controller.
VariTrane F PD Min Position: The minimum damper position for a VariTrane F style box
when it is operating in the pressure dependant mode. Valid range: 0 to 100%.
VAV-SVX01C-EN