Trane RT-PRC010-EN Manuel d'utilisateur télécharger pdf (Page 97)

97RT-PRC010-EN

• VAV Supply Air Temperature control

with inlet guide vanes — Provided with

all the necessary controls to control/

operate a VAV rooftop from the

discharge air temperature, including a

discharge air microprocessor

controller, a discharge air sensor,

pressure sensor and inlet guide vanes.

The microprocessor controller

coordinates the economizer control

and the stages of cooling with zone or

outdoor air reset capabilities and an

adjustable control band to fine-tune the

control to specific applications. The

inlet guide vanes are used with VAV

rooftops to control duct static pressure.

Option includes vanes and static

pressure controls. Forward-curved fans

with inlet vanes are the most efficient

way to mechanically modulate airflow.

• Exhaust Fan Variable Frequency Drives

w/o Bypass (with Statitrac Only) —

Provided with all the necessary

controls to control/maintain building

space pressure through a CV or VAV

rooftop. The Variable Frequency Dri ve

(VFD) modulates the speed of the

exhaust fan motor in response to

building pressure. A differential

pressure control system, called

Statitrac, uses a differential pressure

transducer to compare indoor building

pressure to atmospheric pressure. The

VFD receives a 0-10vdc signal from the

unit microprocessor based upon the

space static pressure and causes the

drive to accelerate or decelerate as

required to maintain the space

pressure within the deadband.

• Exhaust Fan Variable Frequency Drives

and Bypass (with Statitrac Only) —

Bypass control provides full nominal

airflow in the event of drive failure.

• VAV Supply Air Temperature Control

with Variable Frequency Drives w/o

Bypass — Provided with all necessary

controls to operate a VAV rooftop from

the discharge air temperature,

including discharge air microprocessor

controller and discharge air sensor. The

microprocessor controller coordinates

the economizer control and the stages

of cooling with discharge air

temperature reset capabilities. Includes

factory installed and tested variable

frequency drives (VFD) to provide

supply fan motor speed modulation.

VFD receives 0-10vdc from the unit

microprocessor based upon supply

static pressure and causes the drive to

accelerate or decelerate as required to

maintain the supply static pressure

setpoint.

• VAV Supply Air Temperature Control

with Variable Frequency Drives and

Bypass — Bypass control provides full

nominal airflow in the event of drive

failure.

Ambient Control

• Low Ambient Dampers are provided

on condenser fan to allow the unit to

operate down to 0 F. (20-75 tons only)

Agency Approval

• Rooftops can be provided with either

Underwriter’s Laboratories (UL) or

Canadian Standards Association

(CSA) approval.

Miscellaneous Options

• Non-Fused Disconnect Switch with

External Handle — External handle

enables the operator to disconnect unit

power with the control box door closed

for safety.

• Hot Gas Bypass — Valves, piping and

controls are all included to allow

operation at low airflow, avoiding coil

frosting and damage to compressor.

When suction pressure falls below

valve adjustable setpoint, the valves

modulate hot gas to the inlet of the

evaporator.

• Economizer Control with Comparative

Enthalpy — used with the fresh air

economizer, two enthalpy sensors are

provided to compare total heat content

of the indoor air and outdoor air to

determine the most efficient air source

when economizing.

• Economizer Control with Reference

Enthalpy — used with the fresh air

economizer, an outdoor enthalpy

sensor is provided to compare the total

heat content of outdoor air to a locally

adjustable setpoint. The setpoint is

programmed at the human interface,

or remote human interface, to

determine if the outdoor enthalpy

condition is suitable for economizer

operation.

• Economizer Control with Dry Bulb —

used with the fresh air economizer, an

outdoor temperature sensor is

included for comparing the outdoor

dry bulb temperature to a locally

adjustable temperature setpoint. The

setpoint is programmed either at the

human interface, or remote human

interface, to determine if outdoor air

temperature is suitable for economizer

operation.

• Ultra Low Leak Fresh Air Dampers —

Dampers have chlorinated polyvinyl

chloride gasketing to seal to a leakage

rate of 1 percent of nominal airflow at

one-inch W.C. static pressure.

• High Duct Temperature Thermostats —

Two manual reset thermostats, one

located in the discharge section of the

unit set at 240 F and the other in the

return section set at 135 F. The

rooftop will shut down if the

thermostats are tripped.

• High Capacity Evaporator Coil —

Additional rows of coil and enhanced

evaporator tube surfaces provide

increased capacity compared to

standard coils.

• Copper Fins On Condenser Coil —

Copper fins offer extra corrosion

resistance as compared to standard

aluminum fins.

• Generic Building Automation System

(GBAS) Module — Provided for those

cases where the customer uses a

nonTracer building management

systems. The GBAS module provides a

binary input for Demand Limiting, four

(4) analog inputs for setpoint

adjustment and five (5) relay outputs

for diagnostic reporting. Inputs can use

a potentiometer or 0-5 vdc signal.

• High Efficiency Motors — Supply and

exhaust fans are provided with high

efficiency motors.

• Remote Human Interface Panel (RHI)

— Remote Human Interface Panel can

perform all the same functions as unit

mounted Human Interface Panel,

except for the Service Mode. Up to 4

rooftop units can be monitored and

controlled with a single Remote

Human Interface Panel. This panel uses

the same attractive enclosure as our

Tracker

building control panel. With

features such as a 2 line X 40 character

clear English display, a red LED light to

indicate an alarm condition (alarm also

shown on the two line display), a

simple 16 key keypad that is used in

conjunction with the display, to prompt

Options

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Trane RT-PRC010-EN Manuel d'utilisateur Page 97

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