CONTROLS (cont)

LEGEND

AHA

— Adjustable Heat Anticipator

IFR

—

Indoor-Fan Relay

Terminal (Marked)

CB

— Circuit Breaker

L

—

Light

 

CC

— Cooling Compensator

LLS

—

Liquid Line Solenoid

Terminal (Unmarked)

CLO

— Compressor Lockout

OAT

—

Outdoor-Air Thermostat

Terminal Block

DAT

— Discharge Air Thermistor

PL

—

Plug Assembly

DM

— Damper Motor

SR

—

Solenoid Relay

Splice

EAS

— Economizer Actuator

TB

—

Terminal Block

 

 

Auxiliary Switch

TC

—

Thermostat Cooling

Factory Wiring

EMC

— Economizer Motor Contactor

TH

—

Thermostat Heating

Field Wiring

FU

— Fuse

TRAN —

Transformer

Option/Accessory Wiring

IFC

— Indoor-Fan Contactor

UR

—

Unloader Relay

To Indicate Common Potential

Only, Not To Represent Wiring

APPLICATION DATA

1.OUTDOOR INSTALLATION — Units approved for outdoor installation only.

2.DUCTWORK — Secure vertical discharge ductwork to roof curb. For horizontal discharge applications, either attach ductwork to unit, or use field-supplied flanges attached to the horizontal discharge openings and attach all ductwork to flanges.

3.HORIZONTAL ECONOMI$ER — A field-installed acces- sory for horizontal discharge applications. Field-installed power exhaust accessory also available for vertical or hori- zontal EconoMi$er applications (036-120).

4.THRU-THE-BOTTOM POWER CONNECTIONS — For applications requiring thru-the-bottom connections, Bryant accessory thru-the-bottom package must be purchased to ensure proper connections (036-120).

5.THERMOSTAT — Use of 2-stage heating and cooling ther- mostat is recommended for all units. A 2-stage cooling ther- mostat is required on units with accessory economizer to provide integrated cooling. A two-stage thermostat is required for all 548F/549B090,120 and 542J150,180 units.

6.HEATING-TO-COOLING — All units are automatic changeover from heating to cooling when automatic changeover thermostat and subbase are used.

7.AIRFLOW — Units are draw-thru on cooling and blow-thru on heating.

8.MAXIMUM AIRFLOW — To minimize the possibility of con- densate blow-off from indoor coil, airflow through units should not exceed 500 cfm/ton.

9.MINIMUM AIRFLOW — For cooling, minimum airflow is 300 cfm/ton. For 548F units with electric heating, the required minimum cfm is 900 for 548F036; 1200 for 548F048; 1500 for 548F060; 1800 for 548F072; 2250 for 548F090; 2500 for 548F102; and 3000 for 548F120, with the following exceptions:

UNIT

UNIT

HEATER

UNIT

REQUIRED

MINIMUM

548F

VOLTAGE

kW

CONFIGURATION

CFM

 

 

 

 

 

208/230

42.4

Horizontal

3200

120

208/230

50.0

Horizontal

3200

 

 

Horizontal

 

 

 

 

 

 

460

50.0

or

3200

 

 

 

Vertical

 

090-120

 

17.0

Horizontal

2800

575

 

or

 

34.0

2350

 

 

Vertical

 

 

 

 

For 549B and 542J units with electric heating, the required minimum cfm is 900 for 549B036; 1200 for 549B048; 1500 for 549B060; 1700 for 549B072; 2250 for 549B090; 3000 for 549B120; 3900 for 542J150; and 4500 for 542J180, with the fol- lowing exceptions:

UNIT

UNIT

HEATER

UNIT

REQUIRED

MINIMUM

549B

VOLTAGE

kW

CONFIGURATION

CFM

 

 

 

 

 

 

 

Horizontal

 

 

208/230

50.0

or

3250

120

 

 

Vertical

 

 

 

Horizontal

 

 

 

 

 

 

460

50.0

or

3400

 

 

 

Vertical

 

10.MINIMUM AMBIENT COOLING OPERATING TEMPERA- TURE — The minimum temperature for standard units is 25 F (036-120) and 40 F (542J150,180). With accessory Motormaster® control, units can operate at outdoor temper- atures down to –20 F.

11.INTERNAL UNIT DESIGN — Due to Bryant’s internal unit design (draw-thru over the motor), air path, and specially designed motors, the full horsepower (maximum continuous bhp) listed in the Physical Data table and the notes following each Fan Performance table can be utilized with confidence.

Using Bryant motors with the values listed in the Physical and Fan Performance Data tables will not result in nuisance tripping or premature motor failure. The unit warranty will not be affected.

14

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Image 14
Bryant 549B, 542J, 548F manual Application Data
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549B, 548F, 542J specifications

Bryant 542J is a high-efficiency gas furnace that stands out for its reliability and advanced heating technologies. Designed to deliver consistent warmth and comfort in residential settings, it combines innovative engineering with energy-efficient features.

One of the key characteristics of the Bryant 542J is its two-stage heating capability. This means that the furnace can adjust its heat output according to the heating demands of your home. During milder weather, it operates at a lower stage, consuming less energy while still maintaining a comfortable environment. When the temperatures drop, the furnace shifts to its higher capacity, providing the necessary warmth efficiently. This not only enhances comfort but also contributes to lower energy bills.

In addition to its two-stage operation, the Bryant 542J also incorporates a variable-speed blower motor. This technology allows the furnace to adjust the airflow depending on the heating requirements, ensuring an even distribution of warm air throughout the home. The variable-speed blower also operates more quietly than conventional fixed-speed motors, creating a serene indoor environment.

Energy efficiency is a hallmark of the Bryant 542J, boasting an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%. This impressive rating means that a significant portion of the energy consumed is effectively converted into usable heat, resulting in substantial savings on heating costs over time. Furthermore, the furnace is equipped with a sealed combustion system that draws air from outside the home, minimizing energy waste and improving indoor air quality.

Diagnostic features are another highlight of the Bryant 542J, which come equipped with SmartEvap technology. This allows the unit to self-diagnose potential issues, providing homeowners with peace of mind and simplifying maintenance procedures.

Durability is also a key feature of the Bryant 542J. It is constructed with high-quality materials designed to withstand harsh winter conditions, ensuring a long lifespan and reliable performance. Its compact design also allows for flexible installation, making it suitable for various residential layouts.

In summary, the Bryant 542J is more than just a gas furnace; it is a sophisticated heating solution that combines efficiency, comfort, and reliability. With features such as two-stage heating, a variable-speed blower, high AFUE ratings, and advanced diagnostics, it is an excellent choice for homeowners seeking an efficient and effective heating system.
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