TYPICAL WIRING SCHEMATIC (cont)

542J150,180

LEGEND AND NOTES FOR TYPICAL WIRING SCHEMATIC

AHA

—

Adjustable Heat Anticipator

L

—

Light

BKR W/AT —

Breaks with Amp Turns

LOR

—

Lock Out Relay

C

—

Contactor, Compressor

LPS

—

Low-Pressure Switch

CAP

—

Capacitor

LS

—

Limit Switch

CB

—

Circuit Breaker

OAT

—

Outdoor-Air Thermostat

CC

—

Cooling Compensator

OFC

—

Outdoor-Fan Contactor

CH

—

Crankcase Heater

OFM

—

Outdoor Fan Motor

CLO

—

Compressor Lockout

OP

—

Overcurrent Protector

COMP

—

Compressor Motor

PL

—

Plug Assembly

CT

—

Current Transformer

QT

—

Quadruple Terminal

CTD

—

Compressor Time Delay

RVR

—

Reversing Valve Relay

DAT

—

Discharge Air Thermistor

RVS

—

Reversing Valve Solenoid

DB

—

Defrost Board

TB

—

Terminal Block

DFT

—

Defrost Thermostat

TC

—

Thermostat Cooling

DM

—

Damper Motor

TH

—

Thermostat Heating

DR

—

Defrost Relay

TRAN — Transformer

DU

— Dummy Terminal

 

 

Terminal (Marked)

EC

— Enthalpy Control

 

 

 

 

 

EQUIP

— Equipment

 

 

Terminal (Unmarked)

FL

— Fuse Link

 

 

Terminal Block

FPT

— Freeze Protection Thermostat

 

 

 

 

 

GND

— Ground

 

 

Splice

HC

— Heater Contactor

 

 

Factory Wiring

HPS

— High-Pressure Switch

 

 

 

 

 

HR

— Heat Relay

 

 

Field Wiring

HTR

— Heater

 

 

Option/Accessory Wiring

IFC

— Indoor-Fan Contactor

 

 

 

 

 

IFCB

— Indoor-Fan Circuit Breaker

 

 

To Indicate Common Potential Only:

IFM

— Indoor Fan Motor

 

 

Not To Represent Wiring

IP

— Internal Protector

 

 

 

NOTES:

1.Compressor and/or fan motor(s) thermally protected. Three-phase motors are protected against primary single phasing conditions.

2.If any of the original wire furnished must be replaced, it must be replaced with type 90° C wire or its equivalent.

3.CB1,2 must trip amps are equal to or less than 156% FLA, IFCB 140%.

4.The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices. Before replacing CLO, check these devices.

5.Jumpers are omitted when unit is equipped with economizer.

6.Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single-pole, double-throw contact. An underlined number signifies a normally-closed contact. Plain (no line) number signifies a normally-open contact.

7.Remove jumper between terminals RC and RH.

116

Page 115 Page 117
Page 116
Image 116
Bryant 549B, 542J, 548F manual Bkr W/At, Lor, Lps, Cap, Ofc, Comp, Ctd, Rvr, Dft, Equip, Fpt, Gnd, Hps, Htr, Ifcb
Page 115 Page 117

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.
Top Page Image Contents