Carrier 48TJD User Manual download pdf (Page 2)

Date: Supersedes:

48/50TJ016, 020, 024, 028

SINGLE-PACKAGE COOLING UNITS

WITH GAS HEAT (48TJ) OR

OPTIONAL ELECTRIC HEAT (50TJ)

48TJ

50TJ

Rev.:

-2SB

JOB NAME: LOCATION:

BUYER: BUYER P.O. # CARRIER #

UNIT NUMBER: MODEL NUMBER:

PERFORMANCE DATA CERTIFIED BY: DATE:

DESCRIPTION

The 48TJ units are one-piece electric cooling/gas heating units and the 50TJ

units are one-piece electric cooling/optional electric heating units, prewired and

precharged. The 48/50TJ units have bottom air openings for separate supply and

return ductwork. The 48TJD units are low heat units and the 48TJF units are high

heat units. The 48TJM units are low heat, stainless steel heat exchanger units and

the 48TJN units are high heat, stainless steel heat exchanger units. The unit is

intended for installation on an accessory curb (ordered separately). Horizontal

supply and return connections are also possible with a factory-preassembled hori-

zontal conversion adapter roof curb accessory (ordered separately). Bottom

discharge on concentric applications requires a transition duct (field-supplied)

external to the unit.

STANDARD UNIT FEATURES

All units meet ASHRAE Standard 90.1.

Standard one-year product warranty.

Five-year warranty on the compressor (48/50TJ016). One year war-

ranty on the compressor (48/50TJ020-028).

Units are rated in accordance with ARI standard 360. Standard unit is

certified and listed by ETL and ETL, Canada.

Low outdoor temperature cooling operation to 40 F (4 C) as standard.

Dual freezestat protection is provided as standard.

Dual scroll compressors with internal linebreak protection.

Indoor and outdoor coils constructed of aluminum fins mechanically

bonded to seamless internally grooved copper tubes.

Dual TXVs (thermostatic expansion valves) metering devices.

Liquid line filter driers provided in each refrigeration circuit.

Optional gear-driven EconoMi$er IV equipped with solid-state con-

troller that includes CO

ventilation control capability.

Manually adjustable outside air intake for up to 25% outside air.

Automatic changeover (when used with an auto-changeover

thermostat).

Single-point gas and electric connections. Disconnect in accordance

with NEC must be field-supplied and installed.

All units utilize 2-stage cooling.

Belt drive adjustable evaporator fan.

Choice of low-medium or high-static indoor fan drive capability.

Cabinet made of pre-painted, galvanized steel with baked enamel

finish.

Cooling systems have low and high-pressure switches. Two-inch

disposable type return-air filters are factory installed.

Provision for alternate end return in base unit. Horizontal supply

available by using accessory curb. EconoMi$er IV may be used with

horizontal supply and return.

Direct drive propeller condenser fans with vertical discharge.

48TJ UNITS ONLY

Five-year non-prorated warranty on Alumagard™ coated Turbo-

tubular™ gas heat exchanger.

2-stage gas heat in a single 2-stage gas valve.

Induced draft combustion system with Hall effect sensor to detect

proper operation of induced-draft motor.

Heavy Alumagard coated heat exchangers with aluminized steel

burners.

Optional stainless steel heat exchangers.

Heating controls with solid-state direct spark ignition system (pilotless

system) and redundant gas valve. High temperature limit switches and

auto-reset flame rollout switch are standard.

Reliable IGC (integrated gas unit controller) with built in diagnostics

to determine error codes and control fan on/off delays for energy

savings and maximum comfort control.

Integrated gas unit controller provides anti-cycle protection for gas

heat operation.

PERFORMANCE DATA

Unit Operating Weight ________________________________ lb/kg

COOLING

Gross Total Capacity ______________________________ Btuh/kW

at Condenser Air Temperature ________________________°F/°C

Gross Sensible Capacity ___________________________ Btuh/kW

Compressor Power Input _______________________________ kW

Indoor Entering Air db ___________°F/°C wb __________°F/°C

Cfm / L/s__________ External Static Pressure _________ in. wg/Pa

Indoor Fan Motor Size ______________________________ Hp/kW

Exhaust Fan Motor Size _____________________________ Hp/kW

Curb Weight ________________________________________ lb/kg

HEATING

Heating Capacity:

Gas Stage 1 _____________________________________ Btuh/kW

Gas Stage 2 _____________________________________ Btuh/kW

Gas Heating Capacity Total _________________________ Btuh/kW

Electric Stage 1 ______________________________________ kW

Electric Stage 2 ______________________________________ kW

Electric Heating Capacity Total __________________________ kW

ALL 208/230,

460-V UNITS

ARI STANDARD

360

1 2 3 4 5 6 7 ... 11 12

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Carrier 48TJD User Manual Page 2

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