Carrier 48TFD008-014 User Manual download pdf (Page 3)

The units can be easily converted

from a vertical to a horizontal duct con-

figuration by relocating the panels sup-

plied with the unit.

The non-corrosive sloped conden-

sate pan permits either an external

horizontal side condensate drain (out-

side the roof curb) or an internal verti-

cal bottom drain (inside the roof curb).

Both options require an external, field-

supplied P-trap.

The 48TF units were designed with

service technicians in mind. The

single-row condenser coils on the

48TF004 and 008 units simplify the

cleaning process. The efficient

in-shot burners and all ignition

components are contained in an

easily removable, compact assembly.

The 48TF004-014 units also have a

standard filter access panel, which per-

mits tool-less filter changes, even on

units with horizontal economizers.

Simple electrical connections

Terminal boards, located in the base

unit control box, facilitate connections

to room thermostat, outdoor thermo-

stat(s), and economizer. Service panels

are quickly removed, permitting easy

servicing.

Thru-the-bottom utility connection

capability allow power, control wiring,

and gas to be routed through unit base

pan, minimizing roof penetrations.

Gas, power, and control connections

are made on the same side of the unit

to simplify installation.

In addition, color-coded wires permit

easy tracing and diagnostics.

Proven compressor reliability

Design techniques feature computer-

programmed balance between com-

pressor, condenser, and evaporator.

Carrier-specified hermetic compres-

sors are equipped with compressor

overcurrent and overtemperature pro-

tection to ensure dependability.

All 48TF units have Carrier’s exclu-

sive Acutrol™ metering device which

precisely controls refrigerant flow,

preventing slugging and flood-back,

while maintaining optimum unit

performance. Refrigerant filter driers

are standard.

Integrated economizers and

outdoor air

Optional economizers and manual

outdoor-air dampers introduce outdoor

air which mixes with the conditioned

air, improving indoor-air quality and of-

ten reducing energy consumption.

During a first stage call for cooling, if

the outdoor-air temperature is below

the economizer control changeover

set point, the discharge-air sensor

modulates the economizer outdoor-air

damper open to take advantage of free

cooling provided by the outside air.

When second-stage cooling is called

for, the compressor is energized in

addition to the economizer. If the

outdoor-air temperature is above the

changeover set point, the first stage of

compression is activated and the econ-

omizer stays at vent position. Dura-

blade economizer operation is con-

trolled by a dry-bulb thermostat that

senses outdoor-air temperature.

Accessory upgrade kits allow for

either outdoor air enthaply changeover

or for more precise differential

enthalpy control.

The Durablade economizer (option

or accessory) on the 48TF004-014

units has a reliable sliding plate damper

which is easily adjusted for 100% out-

door air, 100% return air, or any

proportions of mixed air.

The 48TF004-014 units can

also utilize the factory or field-installed

EconoMi$er. The EconoMi$er is

microprocessor controlled and incor-

porates a parallel, opposed-blade gear

driven damper system. In addition, it

has a spring return built into the damp-

er actuator to provide reliable close-on-

power-loss. The EconoMi$er comes

equipped with up to 90% barometric

relief capability for high outdoor air-

flow applications.

In addition, the EconoMi$er two-

stage power exhaust accessory can be

utilized to help maintain proper build-

ing pressure.

For units without economizer, year-

round ventilation is enhanced by a

manual outdoor-air damper (ordered as

an accessory or an option). The damp-

er can be preset to admit up to 50%

outdoor air.

Carrier PremierLink™ con-

trols add reliability, efficiency,

and simplification

The PremierLink direct digital controls

can be ordered as a factory-installed

option or as a field-installed accessory.

Designed and manufactured exclusively

by Carrier, the controls can be used to

actively monitor and control all modes

of operations, as well as monitor the

following diagnostics and features: unit

number, zone temperature, zone set

point, zone humidity set point,

discharge-air temperature, outdoor hu-

midity level, filter status, fire shutdown

status, IAQ set point, enthalpy status,

differential enthalpy status, heat/cool

lockout, CFM set point, pre-occupancy

purge, economizer controls and early

morning warm-up.

This controller has a 38.4K Baud

communications capability and is com-

patible with ComfortLink™ controls,

CCN and ComfortVIEW™ software. The

Scrolling Marquee and Navigator are op-

tional tools that can be used for program-

ming and monitoring the unit for optimal

performance. The addition of the Carrier

sensor in the conditioned space

provides ASHRAE 62-99 compliance

and Demand Control Ventilation.

The PremierLink peer-to-peer,

Internet-ready communicating control is

designed specifically for Constant Vol-

ume and Variable Volume and Temper-

ature applications. This comprehensive

controls system allows all Carrier 3 to

25 ton rooftops to be daisy chained

together on a roof to create a fully func-

tional HVAC (heating, ventilation and

air conditioning) automation system.

Carrier Apollo controls

The Apollo communicating controls

are factory-installed into the rooftop

unit control box, and come equipped

with built-in diagnostic capabilities.

Light-emitting diodes (LEDs) simplify

troubleshooting by indicating thermo-

stat commands for both stages of heat-

ing and cooling, evaporator fan opera-

tion, and economizer operation. The

Apollo communicating controls are de-

signed to work specifically with the

Carrier TEMP and VVT® (variable vol-

ume and temperature) thermostats.

The Apollo controls allow the use of an

IAQ (Indoor-Air Quality) sensor. The

Apollo controls, combined with Carrier

thermostats, incorporate a 5-minute

recycle delay timer between modes of

operation to prevent short cycling.

Indoor-air quality begins with

Carrier rooftops

Sloped condensate pans minimize

biological growth in rooftop units in

accordance with ASHRAE (American

Society of Heating, Refrigeration, and

Air Conditioning Engineers) Standard

62. Two-inch filters with optional dirty

filter indicator switch provide for

greater particle reduction in the return

air. The face-split evaporator coils

improve the dehumidification capabili-

ty of standard units, maximize building

humidity control.

Optional proportional reacting

sensor is available with the

EconoMi$er to aid the IAQ benefits.

Features/Benefits (cont)

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