Table 16 - Orifice Size and Manifold Pressure for Gas Input Rate (cont.)

(Tabulated Data Based on 21,000 Btuh High-Heat/14,500 Btuh for Low-Heat Per Burner, Derated 4% for Each 1000 Ft Above

Sea level)

 

 

 

AVG. GAS

 

 

 

SPECIFIC GRAVITY OF NATURAL GAS

 

 

 

ALTITUDE RANGE

HEAT VALUE

 

0.58

 

0.60

 

0.62

 

0.64

 

(FT)

AT ALTITUDE

 

 

 

 

 

 

 

 

 

 

 

 

 

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

 

 

 

(BTUH/CU FT)

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

 

 

 

675

44

 

3.5/1.7

43

 

3.2/1.5

43

 

3.3/1.6

43

 

3.4/1.6

 

 

 

700

44

 

3.3/1.6

44

 

3.4/1.6

44

 

3.5/1.7

43

 

3.2/1.5

 

 

 

725

45

 

3.7/1.8

45

 

3.8/1.8

44

 

3.3/1.6

44

 

3.4/1.6

U.S.A.

 

6001 to

750

46

 

3.6/1.7

46

 

3.8/1.8

45

 

3.7/1.8

45

 

3.8/1.8

Only

 

7000

775

46

 

3.4/1.6

46

 

3.5/1.7

46

 

3.6/1.7

46

 

3.8/1.8

 

 

 

800

47

 

3.6/1.7

47

 

3.8/1.8

46

 

3.4/1.6

46

 

3.5/1.7

 

 

 

825

47

 

3.4/1.6

47

 

3.5/1.7

47

 

3.6/1.7

47

 

3.8/1.8

 

 

 

850

48

 

3.7/1.7

48

 

3.8/1.8

47

 

3.4/1.6

47

 

3.5/1.7

 

 

 

AVG. GAS

 

 

 

SPECIFIC GRAVITY OF NATURAL GAS

 

 

 

ALTITUDE RANGE

 

0.58

 

0.60

 

0.62

 

0.64

HEAT VALUE

 

 

 

 

 

(FT)

 

 

 

 

 

 

 

 

 

 

 

 

 

AT ALTITUDE )

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

 

 

 

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

 

 

 

 

 

 

 

 

 

 

 

650

44

 

3.3/1.6

44

 

3.4/1.6

44

 

3.5/1.7

43

 

3.2/1.5

 

 

 

675

45

 

3.7/1.8

45

 

3.8/1.8

44

 

3.3/1.6

44

 

3.4/1.6

 

 

 

700

46

 

3.6/1.7

46

 

3.7/1.8

46

 

3.8/1.8

45

 

3.8/1.8

U.S.A.

 

7001 to

725

47

 

3.8/1.8

46

 

3.5/1.7

46

 

3.6/1.7

46

 

3.7/1.8

Only

 

8000

750

47

 

3.5/1.7

47

 

3.7/1.8

47

 

3.8/1.8

46

 

3.5/1.6

 

 

 

775

48

 

3.8/1.8

47

 

3.4/1.6

47

 

3.6/1.7

47

 

3.7/1.7

 

 

 

800

48

 

3.6/1.7

48

 

3.7/1.8

48

 

3.8/1.8

47

 

3.4/1.6

 

 

 

825

48

 

3.3/1.6

48

 

3.5/1.6

48

 

3.6/1.7

48

 

3.7/1.8

 

 

 

 

 

 

 

SPECIFIC GRAVITY OF NATURAL GAS

 

 

 

ALTITUDE RANGE

 

 

0.58

 

0.60

 

0.62

 

0.64

 

(FT)

 

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

 

 

 

 

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

 

 

 

625

45

 

3.7/1.8

45

 

3.8/1.8

44

 

3.3/1.6

44

 

3.4/1.6

 

 

 

650

46

 

3.6/1.7

46

 

3.7/1.8

46

 

3.8/1.8

45

 

3.8/1.8

U.S.A.

 

8001 to

675

47

 

3.8/1.8

46

 

3.4/1.6

46

 

3.5/1.7

46

 

3.7/1.7

 

700

47

 

3.5/1.7

47

 

3.6/1.7

47

 

3.7/1.8

46

 

3.4/1.6

Only

 

9000

 

 

 

 

 

725

48

 

3.7/1.8

48

 

3.8/1.8

47

 

3.5/1.7

47

 

3.6/1.7

 

 

 

 

 

 

 

 

 

 

750

48

 

3.5/1.7

48

 

3.6/1.7

48

 

3.7/1.8

48

 

3.8/1.8

 

 

 

775

49

 

3.8/1.8

48

 

3.4/1.6

48

 

3.5/1.7

48

 

3.6/1.7

ALTITUDE RANGE

AVG GAS

 

 

 

SPECIFIC GRAVITY OF NATURAL GAS

 

 

 

HEAT VALUE

 

0.58

 

0.60

 

0.62

 

0.64

 

(FT)

AT ALTITUDE

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

Orifice

 

Manifold

 

 

 

(BTU/CU FT)

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

No.

 

Pressure

 

 

 

600

46

3.6/1.7

46

3.7/1.8

46

3.8/1.8

45

3.7/1.8

 

 

 

625

47

3.7/1.8

47

3.8/1.8

46

3.5/1.7

46

3.6/1.7

U.S.A.

 

9001 to

650

47

3.4/1.6

47

3.6/1.7

47

3.7/1.8

47

3.8/1.8

Only

10,000

675

48

3.6/1.7

48

3.8/1.8

47

3.4/1.6

47

3.5/1.7

 

 

 

700

48

3.4/1.6

48

3.5/1.7

48

3.6/1.7

48

3.7/1.8

 

 

 

725

49

3.7/1.8

49

3.8/1.8

48

3.4/1.6

48

3.5/1.7

* Orifice numbers 43 are factory installed

 

 

 

 

SERVICE AND MAINTENANCE

 

 

 

 

 

!

WARNING

 

 

PROCEDURES

 

 

 

 

 

ELECTRICAL SHOCK, FIRE OR EXPLOSION

 

!

WARNING

 

 

 

 

 

HAZARD

 

 

 

 

 

Failure to follow this warning could result in personal injury

 

FIRE, PERSONAL INJURY AND UNIT DAMAGE

 

 

 

or death, or property damage.

 

HAZARD

 

 

 

 

 

Before servicing, disconnect all electrical power to furnace.

 

Failure to follow this warning could result in personal injury,

 

 

 

Verify proper operation after servicing.

 

death and/or property damage.

 

 

 

 

 

 

The ability to properly perform maintenance on this equipment requires certain knowledge, mechanical skills, tools, and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment other than those procedures recommended in the User’s Manual.

312A

45

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Bryant 120 instruction manual Service and Maintenance Procedures, Electrical SHOCK, Fire or Explosion Hazard, Btu/Cu Ft

120 specifications

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