Bryant 579F User Manual page 271

Fan Performance Using Accessory
Power Exhaust (581A155,180)
POWER EXHAUST PERFORMANCE (581A210-300)
Low Speed 208 V
Low Speed 230,460,575V
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3250 3350 3450 3550 3650
ALTITUDE COMPENSATION* — 581A155,180
(Natural Gas Units)
ELEVATION
(ft)
Low Heat
0-3,000
3,000- 7,000
7,000- 9,000
9,000-10,000
above 10,000
*Includes a 4% input reduction per each 1,000 feet.
†Orifices available through your Bryant dealer.
ALTITUDE COMPENSATION — 581A155,180
(LP Gas Units)
ELEVATION
(ft)
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
PERFORMANCE DATA (cont)
a50-4028
Med Speed 208 V High Speed 208 V
Med Speed 230,460,575V High Speed 230,460,575V
c
3750 3850 3950 4050 4250 4450 4650
Exhaust AirFlow (CFM)
NATURAL GAS ORIFICE SIZE†
High Heat
30 29
31 30
32 31
33 31
35 32
LIQUID PROPANE ORIFICE SIZE
Low Heat and High Heat
36
37
38
38
39
40
41
41
42
43
ALTITUDE COMPENSATION — 581A210-300
ELEVATION
(ft)
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
above 10,000
ALTITUDE COMPENSATION — 581A210-300
ELEVATION
(ft)
0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
above 10,000
ALTITUDE DERATING FACTOR*
4850
ELEVATION
(ft)
0-2,000
2,001-3,000
3,001-4,000
4,001-5,000
5,001-6,000
*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
tions 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 —
MOTOR
HORSEPOWER
3.0
2.9, 3.7
5.0
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.
271
(Natural Gas)
ORIFICE SIZE — NATURAL GAS
Low Medium High Heat
Heat Heat (6 Cell)
29 30 29
29 30 29
30 31 30
30 31 30
30 31 30
30 31 30
31 32 31
31 32 31
31 32 31
32 33 32
(LP Gas)
ORIFICE SIZE — LP GAS
Low Medium High Heat
Heat Heat (6 Cell)
35 38 35
36 39 36
36 39 36
37 40 37
37 40 37
38 41 38
39 42 39
40 43 40
41 44 41
42 45 42
MAXIMUM HEATING VALUE
(Btu/ft
1,100
1,050
1,000
950
900
3 , the unit will require a 16% derating. For eleva-
581A155,180
MOTOR EFFICIENCY
(%)
81.7
85.8
87.5
High Heat
(8 Cell)
29
29
30
30
30
30
31
31
31
32
High Heat
(8 Cell)
35
36
36
37
37
38
39
40
41
42
3 )