Trane VUVE Vertical Classroom Manual de instalación descargar pdf (Pagina 81)

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UV-SVN03F-EN 81

Occupied Mode (UC400)

In Occupied Mode, the UC400 controller maintains the

space temperature based on the occupied space

temperature setpoint ± occupied offset. The controller

uses the occupied mode as a default mode when other

forms of occupancy request are not present and the fan

runs continuously. The outdoor air damper, if present, will

close when the fan is OFF. The temperature setpoints can

be local (hard wired), communicated, or stored default

values (configurable using the Tracer TU service tool).

Unoccupied Mode (UC400)

In unoccupied mode, the UC400 controller attempts to

maintain the space temperature based on the unoccupied

heating or cooling setpoint. The fan will cycle between

high speed and OFF. In addition, the outdoor air damper

remains closed, unless economizing. The controller

always uses the stored default setpoint values

(configurable using the Tracer TU service tool), regardless

of the presence of a hard wired or communicated setpoint

value.

Occupied Standby Mode (UC400)

The UC400 controller is placed in occupied standby mode

only when a communicated occupied request is combined

with an unoccupied request from occupancy binary input

BI1. In occupied standby mode, the controller maintains

the space temperature based on the occupied standby

heating or cooling setpoints. Because the occupied

standby setpoints have a typical temperature spread of 2°F

(1.1°C) in either direction, and the outdoor air damper is

closed, occupied standby mode reduces the demand for

heating and cooling the space. The fan will run as

configured (continuously) for occupied mode. The

controller always uses the stored default setpoint values

(configurable using the Tracer TU service tool), regardless

of hard wired or communicated setpoint values. In

addition, the outdoor air damper uses the economizer

occupied standby minimum position setpoint to reduce

the ventilation rate.

Occupied Bypass Mode (UC400)

The UC400 controller is placed in occupied bypass mode

when the controller is operating in the unoccupied mode

and when either the timed override ON button on the

Trane zone sensor is pressed or the controller receives a

communicated occupied bypass signal from a BAS. In

occupied bypass mode, the controller maintains the space

temperature based on the occupied heating or cooling

setpoints. The fan will run as configured (continuous or

cycling). The outdoor air damper closes when the fan is

OFF. The controller remains in occupied bypass mode

until either the CANCEL button is pressed on the Trane

zone sensor or the occupied bypass time (configurable

using the Tracer TU service tool) expires. The temperature

setpoints can configured as local (hard wired),

communicated, or stored default values using the Tracer

TU service tool.

Timed Override Control (UC400)

If the UC400 controller has a timed override option

(ON/CANCEL buttons), pushing the ON button initiates a

timed override on request. A timed override on request

changes the occupancy mode from unoccupied mode to

occupied bypass mode. In occupied bypass mode, the

controller controls the space temperature based on the

occupied heating or cooling setpoints. The occupied

bypass time, which resides in the UC400 controller and

defines the duration of the override, is configurable from

0 to 240 minutes (default value of 120 minutes). When the

occupied bypass time expires, the unit transitions from

occupied bypass mode to unoccupied mode. Pushing the

CANCEL button cancels the timed override request. In

addition, it will end the timed override before the occupied

bypass time has expired and transition the unit from

occupied bypass mode to unoccupied mode.

If the controller is in any mode other than unoccupied

mode when the ON button is pressed, the controller still

starts the occupied bypass timer without changing to

occupied bypass mode. If the controller is placed in

unoccupied mode before the occupied bypass timer

expires, the controller is placed into occupied bypass

mode and remains in this mode until either the CANCEL

button is pressed on the Trane zone sensor or the occupied

bypass time expires.

Zone Temperature Control (UC400)

The UC400 controller has three methods of zone

temperature control:

• Cascade zone control—used in the occupied,

occupied bypass, and occupied standby modes. It

maintains zone temperature by controlling the

discharge air temperature to control the zone

temperature. The controller uses the difference

between the measured zone temperature and the

active zone temperature setpoint to produce a

discharge air temperature setpoint. The controller

compares the discharge air temperature setpoint with

the discharge air temperature and calculates a unit

heating/cooling capacity accordingly (refer to the

illustration below). The end devices (outdoor air

damper, valves, and so on) operate in sequence based

on the unit heating/cooling capacity (0–100 percent).

Difference

Active zone

temperature

setpoint

Calculated

discharge air

temperature

setpoint

Calculated unit

heating/cooling

capacity

Measured

zone

temperature

Measured

discharge air

temperature

Difference

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Trane VUVE Vertical Classroom Manual de instalación Pagina 81

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