Trane VUVE Vertical Classroom Manual de instalación descargar pdf (Pagina 83)

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UV-SVN03F-EN 83

unit ventilators and blower coils) before changing to

another speed. Initially running on high speed provides

adequate torque to start the fan motor from the OFF

position.

Note: In occupied mode, the UC400 controller requires

continuous fan operation because of cascade zone

control. In unoccupied mode, the fan cycles.

Manual Fan Speed Control (UC400)

Regardless of the fan type, the fan runs continuously at the

desired fan speed during occupied, occupied standby, and

occupied bypass operation as follows:

• When the controller receives a communicated fan

speed signal (HIGH, MEDIUM, LOW)

• The associated fan speed s

witch is set to a specific fan

speed

• The Supply Fan Speed Request point is overridden

During unoccupied operation, the fan cycles between OFF

and HIGH,

regardless of the communicated fan speed

signal or fan speed switch setting (unless either of these is

OFF, which in turn, will control the fan OFF).

The fan turns OFF when:

• The controller receives a communicated OFF signal

• The fan speed switch is set to OFF

• Specific diagnostics are generated

• The default fan speed is set to OFF and the

fan is

operating in the AUTO mode

Note: Th

e supply fan speed source can be configured for

BAS, local, or default value control using the Tracer

TU service tool.

AUTO Fan Operation; 1-, 2-, 3-speed Fans

(UC400)

When the controller receives a communicated auto signal

(or the associated fan speed switch is set to AUTO with no

communicated value present), the fan operates in the

AUTO mode. In AUTO mode, the fan operates according

to the fan default (configurable using the Tracer TU service

tool). The fan speed has multiple speed configurations

(default is AUTO) or set to OFF for both heating and

cooling operation. When configured as AUTO (and with

multiple speeds available), the fan changes based on the

required capacity calculated by the control algorithm.

AUTO Fan Operation; ECM Energy Efficient

Mode (UC400)

When the controller is configured for Energy Efficient

Mode, by means of the Fan Operating Mode Request MV

point, the controller and daughter board will minimize

energy use by running the fan at the lowest possible speed

while maintaining space temperature. The controller will

fully utilize valves, economizer, or electric heat which

increases fan speed to meet space temperature (unless the

fan has been manually controlled. Refer to the preceding

section, “Manual Fan Speed Control (UC400)”).

AUTO Fan Operation; ECM Acoustical Mode

(UC400)

When the controller is configured for Acoustical Mode, by

means of the Fan Operating Mode Request MV point, the

controller and daughter board will minimize acoustical

nuisance by balancing changes in fan speed and total fan

noise. The controller will fully OPEN cooling and heating

valves before increasing fan speed to meet space

temperature (unless the fan has been manually controlled.

Refer to the preceding section, “Manual Fan Speed

Control (UC400)”). If multiple stages of electric heat exist

the controller will use a single minimum air flow for each

stage.

Exhaust Control (UC400)

Exhaust control is achieved by a single-speed exhaust fan

and controlled by binary output 2 (BO2). Exhaust control,

if not present, can be enabled by selecting Ye s under the

Exhaust Fan Selection on the Tracer TU Configuration

page under the Equipment Options group.

Note: Exhaust fan configuration cannot be selected with

3-speed fan operation.

Important: If exhaust control is added to an existing

configuration, all other configuration

options should be verified to match the

correct equipment options.Temperature

and flow setpoints will revert to default

values.

The exhaust function is coordinated with the supply fan

and outdoor/return air dampers as follows:

• The exhaust fan energizes when the fan

is running and

when the outdoor air damper position is greater than

or equal to the exhaust fan enable position (or the

outside air damper position at which the exhaust fan

turns ON).

• The exhaust fan turns OFF when

the fan either turns

OFF or the outdoor air damper closes to 10 percent

below the exhaust

fan enable position.

• If the exhaust fan/damper enable setpoint is less

than

10 percent, the exhaust output is energized if the

outdoor air damper position is at the setpoint and de-

energized at 0.

Valve Operation (UC400)

The UC400 controller supports one or two modulating or

two-position valves, depending on the application (refer

Table 23, p. 84). The controller opens and closes the

appropriate valve(s) to maintain the active zone

temperature setpoint at the heating setpoint in heating

mode or the cooling setpoint in cooling mode (refer to

“Cascade Zone Control,” p. 81).

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