Table 1 — Physical Data — 581B036-072 (cont)

UNIT SIZE 581B

 

036

048

 

060

072

FURNACE SECTION

 

 

 

 

 

 

Rollout Switch Cutout Temp (F)†

 

195

195

 

195

195

Burner Orifice Diameter (in. ...drill size)**

 

 

 

 

 

 

Natural Gas — Std

071/072

.113...33

.113...33

 

.113...33

.113...33

 

114/115

.113...33

.113...33

 

.113...33

.113...33

 

149/150

—

.129...30

 

.129...30

.129...30

 

060N

.102...38

.102...38

 

.102...38

—

 

090N

.102...38

.102...38

 

.102...38

—

 

120N

—

.116...32

 

.116...32

—

Liquid Propane — Alt††

071/072

.089...43

.089...43

 

.089...43

.089...43

 

114/115

.089...43

.089...43

 

.089...43

.089...43

 

149/150

—

.102...38

 

.102...38

.102...38

 

060N

.082...45

.082...45

 

.082...45

—

 

090N

.082...45

.082...45

 

.082...45

—

Thermostat Heat Anticipator Setting (amps)

120N

—

.094...42

 

.094...42

—

 

 

 

 

 

 

208/230/460 v

 

 

 

 

 

 

First Stage

 

.14

.14

 

.14

.14

Second Stage

 

.14

.14

 

.14

.14

Gas Input (Btuh)

 

 

 

 

 

 

First Stage/Second Stage (3-phase units)

072

50,000/ 72,000

50,000/ 72,000

 

50,000/ 72,000

50,000/ 72,000

 

115

82,000/115,000

82,000/115,000

 

82,000/115,000

82,000/115,000

 

150

—

120,000/150,000

 

120,000/150,000

120,000/150,000

 

071II

—/ 72,000

—/ 72,000

 

—/ 72,000

—

 

114II

—/115,000

—/115,000

 

—/115,000

—

 

149II

—

—/150,000

 

—/150,000

—

 

060N***

—/ 60,000

—/ 60,000

 

—/ 60,000

—

 

090N***

—/ 90,000

—/ 90,000

 

—/ 90,000

—

 

120N***

—

—/120,000

 

—/120,000

—

Efficiency (Steady State) (%)

072

82.8

82.8

 

82.8

82

 

115

80

81

 

81

81

 

150

—

80.4

 

80.4

80

 

071

82

82

 

82

—

 

114

80

81

 

81

—

 

149

—

80

 

80

—

 

060N

80.2

80.2

 

80.2

—

 

090N

81

81

 

81

—

 

120N

—

80.7

 

80.7

—

Temperature Rise Range

072

25-55

25-55

 

25-55

25-55

 

115

55-85

35-65

 

35-65

35-65

 

150

—

50-80

 

50-80

50-80

 

071

25-55

25-55

 

25-55

—

 

114

55-85

35-65

 

35-65

—

 

149

—

50-80

 

50-80

—

 

060N

20-50

20-50

 

20-50

—

 

090N

30-60

30-60

 

30-60

—

Manifold Pressure (in. wg)

120N

—

40-70

 

40-70

—

 

 

 

 

 

 

Natural Gas — Std

 

3.5

3.5

 

3.5

3.5

Liquid Propane — Alt††

 

3.5

3.5

 

3.5

3.5

Maximum Static Pressure (in. wg)

 

1.0

1.0

 

1.0

1.0

Field Gas Connection Size (in.)

 

1/2

1/2

 

1/2

1/2

HIGH-PRESSURE SWITCH (psig)

 

 

450 ± 50

 

 

Standard Compressor Internal Relief

 

 

 

 

Cutout

 

 

428

 

 

Reset (Auto.)

 

 

320

 

 

LOSS-OF-CHARGE SWITCH/LOW-PRESSURE

 

 

 

 

 

 

SWITCH (Liquid LIne) (psig)

 

 

7 ± 3

 

 

Cutout

 

 

 

 

Reset (Auto.)

 

 

22 ± 5

 

 

FREEZE PROTECTION THERMOSTAT

 

 

30 ± 5

 

 

Opens (F)

 

 

 

 

Closes (F)

 

 

45 ± 5

 

 

OUTDOOR-AIR INLET SCREENS

 

 

Cleanable

 

Quantity...Size (in.)

 

 

1...20 x 24 x 1

 

RETURN-AIR FILTERS

 

 

Throwaway

4...16 x 16 x 2

Quantity...Size (in.)

 

 

2...16 x 25 x 2

 

LEGEND

Bhp — Brake Horsepower

*Single phase/three phase. †Indicates automatic reset.

**60,000 and 72,000 Btuh heat input units have 2 burners. 90,000 and 120,000 Btuh heat input units have 3 burners. 115,000 Btuh heat input units and 150,000 Btuh Heat input units have 3 burners.

††An LP kit is available as an accessory. If an LP kit is used with low NOx units, one low NOx baffle must be removed and the units will no longer be classified as low NOx units.

California compliant three-phase models.

***California SCAQMD compliant low NOx models have combustion products that are controlled to 40 nanograms per joule or less.

—7—

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Bryant 581B Furnace Section, Loss-Of-Charge Switch/Low-Pressure, Freeze Protection Thermostat, OUTDOOR-AIR Inlet Screens
Page 6 Page 8

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.
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