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PERFORMANCE DATA (cont)
ALTITUDE COMPENSATION* — 581A155,180
(Natural Gas Units)
*Includes a 4% input reduction per each 1,000 feet.
†Orifices available through your Bryant dealer.
ALTITUDE COMPENSATION — 581A155,180
(LP Gas Units)
ALTITUDE COMPENSATION — 581A210-300
(Natural Gas)
ALTITUDE COMPENSATION — 581A210-300
(LP Gas)
ALTITUDE DERATING FACTOR*
*Derating of the unit is not required unless the heating value of the gas
exceeds the values listed in the table above, or if the elevation exceeds
6000 ft. Derating conditions must be 4% per thousand ft above 2000 ft.
For example, at 4000 ft, if the heating value of the gas exceeds
1000 Btu/ft
3
, the unit will require a 16% derating. For elevations above
6000 ft, the same formula applies. For example, at 7000 ft, the unit will
require a 28% derating of the maximum heating value per the National
Fuel Gas Code.
IMPORTANT: Local utility companies may be reducing heat content of
gas at altitudes above 2000 ft. If this is being done, changing spuds may
not be required.
EVAPORATOR-FAN MOTOR EFFICIENCY —
581A155,180
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency
requirements as established by the Energy Policy Act of 1992 (EPACT)
effective October 24, 1997.
ELEVATION
(ft)
NATURAL GAS ORIFICE SIZE†
Low Heat High Heat
0-3,000 30 29
3,000- 7,000 31 30
7,000- 9,000 32 31
9,000-10,000 33 31
above 10,000 35 32
ELEVATION
(ft)
LIQUID PROPANE ORIFICE SIZE
Low Heat and High Heat
0-2,000 36
2,000 37
3,000 38
4,000 38
5,000 39
6,000 40
7,000 41
8,000 41
9,000 42
10,000 43
ELEVATION
(ft)
ORIFICE SIZE — NATURAL GAS
Low
Heat
Medium
Heat
High Heat
(6 Cell)
High Heat
(8 Cell)
0-2,000 29 30 29 29
2,000 29 30 29 29
3,000 30 31 30 30
4,000 30 31 30 30
5,000 30 31 30 30
6,000 30 31 30 30
7,000 31 32 31 31
8,000 31 32 31 31
9,000 31 32 31 31
above 10,000 32 33 32 32
Fan Performance Using Accessory
Power Exhaust (581A155,180)
a50-4028
ELEVATION
(ft)
ORIFICE SIZE — LP GAS
Low
Heat
Medium
Heat
High Heat
(6 Cell)
High Heat
(8 Cell)
0-2,000 35 38 35 35
2,000 36 39 36 36
3,000 36 39 36 36
4,000 37 40 37 37
5,000 37 40 37 37
6,000 38 41 38 38
7,000 39 42 39 39
8,000 40 43 40 40
9,000 41 44 41 41
above 10,000 42 45 42 42
ELEVATION
(ft)
MAXIMUM HEATING VALUE
(Btu/ft
3
)
0-2,000 1,100
2,001-3,000 1,050
3,001-4,000 1,000
4,001-5,000 950
5,001-6,000 900
MOTOR
HORSEPOWER
MOTOR EFFICIENCY
(%)
3.0 81.7
2.9, 3.7 85.8
5.0 87.5
581A155-300