PHYSICAL DATA (cont)

UNIT SIZE 581B

 

HEAT

090

102

 

120

150

FURNACE SECTION

 

 

 

 

 

 

 

Rollout Switch Cutout Temp†

 

195

195

 

195

195

Burner Orifice Diameter

 

 

 

 

 

 

(in. ...drill size)

 

 

 

 

 

 

 

Natural Gas

Std

Lo

.120...31

.120...31

 

.120...31

.120...31

 

 

Med

.120...31

.120...31

 

.120...31

.129...30

 

 

Hi

.120...31

.120...31

 

.129...30

Liquid Propane

Accy

Lo

.096...41

.096...41

 

.096...41

.096...41

 

 

Med

.096...41

.096...41

 

.096...41

.102...38

Thermostat Heat Anticipator

Hi

.096...41

.096...41

 

.102...38

 

 

 

 

 

 

Setting (amps)

 

 

 

 

 

 

 

208/230 v and 575 Stage 1

 

.14

.14

 

.14

.14

 

Stage 2

 

.20

.20

 

.20

.20

460 v

Stage 1

 

.14

.14

 

.14

.14

 

Stage 2

 

.20

.20

 

.20

.20

Gas Input (Btuh)Stage1/Stage 2

Lo

125,000/—

125,000/—

 

120,000/180,000

180,000/224,000

 

 

Med

120,000/180,000

120,000/180,000

 

180,000/224,000

200,000/250,000

Efficiency (Steady State) (%)

Hi

180,000/224,000

180,000/224,000

 

200,000/250,000

—/—

 

82

82

 

82, 80 (in 250,000 Btuh

82, 80 (in 250,000 Btuh

 

 

 

 

heat range)

heat range)

Temperature Rise Range

Lo

 

 

 

20-50

20-50

 

35-65

35-65

 

 

Med

35-65

35-65

 

35-65

40-70

Manifold Pressure (in. wg)

Hi

45-75

45-75

 

40-70

 

 

 

 

 

 

Natural Gas

Std

 

3.5

3.5

 

3.5

3.5

Liquid Propane

Accy

 

3.5

3.5

 

3.5

3.5

Gas Valve Quantity

 

 

1

1

 

1

1

Gas Valve Pressure Range

 

 

 

 

 

 

Psig

 

 

0.180-0.487

0.180-0.487

 

0.180-0.487

0.180-0.487

in. wg

 

 

5.0-13.5

5.0-13.5

 

5.0-13.5

5.0-13.5

Field Gas Connection

 

 

 

 

 

 

Size (in.)

 

Lo

1/2

1/2

 

3/4

3/4

 

 

Med

3/4

3/4

 

3/4

3/4

 

 

Hi

3/4

3/4

 

3/4

HIGH-PRESSURE SWITCH (psig)

 

 

 

 

 

 

Standard Compressor

 

 

450 ± 50

 

 

500 ± 50

Internal Relief (Differential)

 

 

 

 

 

 

Cutout

 

 

 

428

 

 

428

Reset (Auto.)

 

 

 

320

 

 

320

LOSS-OF-CHARGE (LOW-PRESSURE)

 

 

 

 

 

 

SWITCH (psig)

 

 

 

 

 

 

 

Cutout

 

 

 

 

7 ± 3

 

Reset (Auto.)

 

 

 

 

22 ± 7

 

FREEZE PROTECTION

 

 

 

 

 

 

 

THERMOSTAT (F)

 

 

 

 

 

 

 

Opens

 

 

 

 

30 ± 5

 

Closes

 

 

 

 

45 ± 5

 

OUTDOOR-AIR INLET SCREENS

 

 

 

 

Cleanable

 

Quantity...Size (in.)

 

 

 

 

1...20 x 24 x 1

 

 

 

 

 

1...16 x 25 x 1

 

 

 

 

 

 

 

RETURN-AIR FILTERS

 

 

 

 

 

Throwaway

 

Quantity...Size (in.)

 

 

4...16 x 20 x 2

4...16 x 20 x 2

 

4...20 x 20 x 2

4...20 x 20 x 2

LEGEND

Bhp — Brake Horsepower

*Weight of 14-in. roof curb.

†Rollout switch lockout is manually reset by interrupting power to unit or resetting thermostat.

NOTE: High-static motor not available on size 150 units.

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Bryant 581B manual Loss-Of-Charge Low-Pressure

581B specifications

The Bryant 581B is an innovative and highly efficient gas furnace that stands out in the HVAC market for its remarkable performance, reliability, and advanced features. Designed to provide optimal heating comfort, the Bryant 581B is perfect for homeowners seeking both quality and energy efficiency.

One of the main features of the Bryant 581B is its impressive Annual Fuel Utilization Efficiency (AFUE) rating. With an AFUE rating of up to 80%, this gas furnace maximizes energy usage, ensuring that a significant portion of the fuel is converted into heat for your home. This efficiency not only translates into lower energy bills but also reduces the carbon footprint, making it an environmentally friendly choice.

The furnace is equipped with a multi-speed blower motor that enhances comfort by providing consistent airflow throughout the home. This technology adjusts to different heating demands, ensuring that every room reaches the desired temperature without the discomfort of hot or cold spots. The quiet operation of the blower motor also adds to the overall comfort, creating a peaceful home environment.

Another notable characteristic of the Bryant 581B is its durable construction. It features a robust heat exchanger built from high-quality materials, designed to withstand the rigors of daily use. The compact design of the furnace allows it to fit seamlessly into various spaces, making it an ideal choice for both new installations and replacement projects.

The Bryant 581B also comes with advanced safety features, including a self-diagnostic control board that monitors the system's performance. This feature allows for easy troubleshooting and maintenance, prolonging the life of the furnace. Additionally, the furnace is equipped with an induced draft blower that enhances venting efficiency and safety by ensuring that combustion gases are safely expelled from the home.

For homeowners looking for enhanced control, the Bryant 581B is compatible with a range of smart thermostats, providing the ability to monitor and adjust heating settings remotely. This integration with smart technology ensures that homeowners can maintain their desired comfort levels while maximizing efficiency.

In conclusion, the Bryant 581B gas furnace is a top-tier option that combines efficiency, durability, and modern technology. With its high AFUE rating, multi-speed blower, and advanced safety features, it promises to deliver unparalleled comfort and peace of mind for years to come. Whether for a new build or an upgrade, the Bryant 581B is an investment that pays off in both comfort and savings.