Carrier 48TJE008-014 User Manual download pdf (Page 2)

All units feature roll-formed baserail

design with forklift slots on all

3 sides and rigging holes for easier

maneuvering. Durable packaging

protects all units during shipment and

storage.

The units can be easily converted

from a vertical to a horizontal dis-

charge conﬁguration by interchanging

the panels supplied with the unit.

All units feature a non-corrosive

sloped condensate drain pan in accor-

dance with ASHRAE (American So-

ciety of Heating, Refrigeration and Air

Conditioning Engineers) Standard

62. Also, the new, sloped condensate

pan permits either an external side

condensate drain (outside the roof

curb) or an internal bottom drain

(inside the roof curb). Both options

require a ﬁeld-supplied P-trap. Plus,

the new condenser coil grille (available

as a ﬁeld-installed accessory) pro-

vides a metal plate as an alternate loca-

tion for the ﬁeld-supplied disconnect,

if desired.

In addition, the units have a stand-

ard ﬁlter access door, which per-

mits tool-less ﬁlter changes.

Efﬁcient, dependable gas heat

operation

Dimpled heat exchangers optimize

heat transfer for improved efﬁciency.

The tubular design permits hot gases

to make multiple passes across the

path of the supply air. In addition,

dimpled heat exchanger tubes act as

bafﬂes, forcing the hot gases to stay in

close contact with the cell walls to

maximize heat transfer and efﬁciency.

The induced draft combustion sys-

tem eliminates the unsightly

appearance of ﬂue stacks, and

diminishes the effects of winds on

heating operation. The inducer fan

draws hot combustion gas through the

heat exchanger at the optimum rate

for the most effective heat trans-

fer. The induced draft also prevents

contaminants from entering the supply

air if a leak in the heat exchanger

occurs.

Dual-stage gas heat on all size units

maximizes efﬁciency and customizes

comfort.

The direct spark ignition system

saves operating expense when com-

pared to old-style pilot ignition sys-

tems. No crossover tube is required,

therefore no sooting or pilot foul-

ing problems can occur.

Standard units are designed for

natural gas. An LP (liquid propane)

Conversion Kit is available as an

accessory, if required. Installation of

the accessory LP kit simply involves

changing the gas oriﬁces to accommo-

date liquid propane gas.

Simple electrical connections

Terminal boards, located in the base

unit control box, facilitate connections

to room thermostat, outdoor ther-

mostat(s), economizer, and electric

heat. Service panels are quickly

removed, permitting easy servicing.

Thru-the-bottom service connection

capability allows power and control

wiring to be routed through the unit

basepan, minimizing roof penetra-

tions. Both power and control connec-

tions 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 compressors

are equipped with compressor over-

current and overtemperature pro-

tection to ensure dependability.

Carrier’s exclusive Acutrol™ meter-

ing device precisely controls refrig-

erant ﬂow, preventing slugging and

ﬂood-back, while maintaining optimum

unit performance.

Durable, dependable

construction

Designed for durability in any climate,

the weather-resistant cabinets are

manufactured using prepainted steel.

The cabinet is constructed of galva-

nized steel and bonderized, and all

exterior panels are coated with a pre-

painted baked enamel ﬁnish. The

paint ﬁnish is non-chalking, and is ca-

pable of withstanding Federal (U.S.A.)

Test Method Standard No. 141

(Method 6061) 500-hour salt spray

test. All internal cabinet panels are

primed, permitting longer life and

a more attractive appearance for the

entire unit. In addition, the units

are designed with a single, continuous

top piece to eliminate any possible

leaks. Totally-enclosed condenser-fan

motors and permanently-lubricated

bearings provide additional unit

dependability.

Integrated economizers and

outdoor air

During a ﬁrst stage call for cooling, if

the outdoor-air temperature is be-

low the control set point, the leaving-

air sensor modulates the economizer

outdoor-air damper open to achieve

the set point. When second-stage

cooling is called for, the compressor is

energized in addition to the econo-

mizer. If the outdoor-air temperature

is above the set point, the ﬁrst stage

of compression is activated and the

economizer stays at minimum vent

position. Economizer operation is

controlled by Accusensor™ I dry-bulb

thermostat that senses outdoor-air

temperature. Accessory upgrade kits

include solid-state enthalpy control

and differential enthalpy sensor.

Table of contents

Page

Features/Beneﬁts .................................................1-3

Model Number Nomenclature ........................................4

Capacities ........................................................4

Physical Data ....................................................5,6

Options and Accessories ...........................................7,8

Base Unit Dimensions ..............................................9

Accessory Dimensions .............................................10

Selection Procedure ..............................................11,12

Performance Data ...............................................13-31

Electrical Data ....................................................32

Typical Piping and Wiring ..........................................33

Typical Wiring Schematic ..........................................34

Controls ........................................................35-39

Application Data ..................................................40

Guide Speciﬁcations .............................................41-43

1 2 3 4 5 6 7 ... 43 44

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Carrier 48TJE008-014 User Manual Page 2

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