Carrier 48TFD008-014 User Manual download pdf (Page 2)

error code is issued. This feature great-

ly improves reliability of the rooftop

unit.

The IGC also contains burner con-

trol logic for accurate and dependable

gas ignition. The LED is visible without

removing the unit control box access

panel. This LED fault-notification sys-

tem reduces service person trouble-

shooting time and minimizes service

costs. The IGC also maximizes heating

efficiency by controlling evaporator-fan

on and off delays.

Quiet, efficient operation and

dependable performance

Compressors have vibration isolators

for quiet operation. Efficient fan and

motor design permits operation at low

sound levels and all 48TF004-014

units are mounted either on mounting

plate (004-007) or on an exclusive

polycore plate (008-014).

The 48TF008-014 units offer lower

utility costs through part-load opera-

tion using 2 stages of cooling.

Quiet and efficient operation is pro-

vided by belt-driven evaporator fans

(standard on all units over 5 tons). The

belt-driven evaporator-fan is equipped

with variable-pitch pulleys which allow

adjustment within the rpm ranges of

the factory-supplied pulleys.

Increased operating efficiency is

achieved through computer-designed

coils featuring staggered internally

enhanced copper tubes. Fins are

ripple-edged for strength, lanced, and

double waved for higher heat transfer.

Tubular, dimpled gas heat exchang-

ers optimize heat transfer for improved

efficiency. The tubular design permits

hot gases to make multiple passes

across the path of the supply air. The

dimpled design creates a turbulent gas

flow to maximize heating efficiency.

The California Air Quality Manage-

ment Districts NO

requirement of

40 nanograms/joule or less is met on

004-006 size Low NO

models.

The extra thick Alumagard™ heat

exchanger coating provides corrosion

resistance and ensures long life.

The unsightly appearance of flue

stacks is eliminated and the effects of

wind on heating operations are dimin-

ished by the induced draft combustion

system. The inducer fan draws hot

combustion gas through the heat ex-

changer at the optimum rate for the

most effective heat transfer. The heat

exchanger operates under negative

pressure, preventing flue gas leakage

into the indoor supply air.

During the Heating mode, the

evaporator-fan relay automatically

starts the evaporator fan after the heat

exchanger warms up to a suitable

temperature. The 30-second fan delay

prevents cold air from entering the

supply duct system when the condi-

tioned space is calling for heat to

maximize efficiency.

The direct-spark ignition system

saves operating expense when com-

pared to pilot ignition systems. No

crossover tube is required, therefore no

sooting or pilot fouling problems can

occur.

All 48TF standard units are designed

for natural gas, but an accessory LP

(liquid propane) conversion kit is

available.

Safety is built in

All 48TF units have a flame rectifica-

tion sensor to quickly sense the burner

flame and ignite burners almost imme-

diately. Fast shutdown is a certainty

since the sensor reacts quickly to any

flame outage or system failure. In the

event of a shutdown, an error code is

issued at the IGC board.

Safety is also assured due to the

heating safety controls which will shut

down the unit if there is a problem. If

excessive temperatures develop, limit

switches shut off the gas valve. After

4 continuous short cycles of the high-

temperature limit switch, the IGC

board locks out the gas heat cycle to

prevent any further short cycles. This

safety feature is provided exclusively on

Carrier rooftop units. The rollout

switch also deenergizes the gas valve in

the event of a flame rollout.

Durable, dependable

construction

Designed for durability in any climate,

the weather-resistant cabinets are con-

structed of galvanized steel and bond-

erized, and all exterior panels are coat-

ed with a prepainted baked enamel fin-

ish. The paint finish is non-chalking,

and is capable of withstanding ASTM

B117 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, all 48TF units are de-

signed with a single, continuous top

piece to eliminate any possible leaks.

Totally enclosed condenser-fan motors

and permanently lubricated bearings

provide additional unit

dependability.

Easy installation and

conversion

All units are shipped in the vertical

duct configuration for fit-up to standard

roof curbs. (Two different curb sizes fit

unit sizes 004-007 and 008-014, re-

spectively.) The contractor can order

and install the roof curb early in the

construction stage, before decisions on

size requirements are made.

All units feature roll-formed base rail

design with forklift slots and rigging

holes for easier maneuvering. (Forklift

slots are found on 3 sides for

48TF004-014 units.) The standard

48TF004-006 units have operating

weights under 500 lb and durable

packaging protects all units during

shipment and storage.

Table of contents

Page

Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ARI Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5,6

Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-10

Options and Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-13

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15

Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16,17

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18,19

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-56

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57-60

Typical Piping and Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62-70

Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72-74

Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75-78

1 2 3 4 5 6 7 ... 79 80

Comments to this Manuals

No comments

Carrier 48TFD008-014 User Manual Page 2

Comments to this Manuals

Related products and manuals for Heat pumps Carrier 48TFD008-014