Bryant 120 Furnace User Manual


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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)
ALTITUDE RANGE
(FT)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
6001 to
7000
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
750 46 3.6/1.7 46 3.8/1.8 45 3.7/1.8 45 3.8/1.8
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
ALTITUDE RANGE
(FT)
AVG. GAS
HEAT VALUE
AT ALTITUDE )
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
7001 to
8000
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
725 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8
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
ALTITUDE RANGE
(FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
8001 to
9000
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
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
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
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
9001 to
10,000
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
650 47 3.4/1.6 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8
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
PROCEDURES
FIRE, PERSONAL INJURY AND UNIT DAMAGE
HAZARD
Failure to follow this warning could result in personal injury,
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.
!
WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal injury
or death, or property damage.
Before servicing, disconnect all electrical power to furnace.
Verify proper operation after servicing.
!
WARNING
312A
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