50
ALTITUDE COMPENSATION* — 48HJ004-007
*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, the input rate should be reduced at higher altitudes.
†Orifices are available through your local Carrier distributor.
ALTITUDE COMPENSATION* — 48HJ008-014
*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, the input rate should be reduced at higher altitudes.
†Orifices are available through your local Carrier distributor.
ELEVATION
(ft)
72,000 AND 115,000 BTUH
NOMINAL INPUT
150,000 BTUH
NOMINAL INPUT
Natural Gas
Orifice Size†
Liquid Propane
Orifice Size†
Natural Gas
Orifice Size
Liquid Propane
Orifice Size†
0-2,000
33 43 30 38
2,000
34 43 30 39
3,000
35 44 31 40
4,000
36 44 32 41
5,000
36 44 33 42
6,000
37 45 34 43
7,000
37 45 35 43
8,000
38 46 36 44
9,000
39 47 37 44
10,000
41 48 38 45
11,000
43 48 39 45
12,000
44 49 40 46
13,000
44 49 41 47
14,000
45 50 42 47
ELEVATION
(ft)
125,000, 180,000, AND
224,000 BTUH
NOMINAL INPUT
250,000 BTUH
NOMINAL INPUT
Natural Gas
Orifice Size†
Liquid Propane
Orifice Size†
Natural Gas
Orifice Size†
Liquid Propane
Orifice Size†
0-2,000
31 41 30 38
2,000
32 42 30 39
3,000
32 42 31 40
4,000
32 42 32 41
5,000
33 43 33 42
6,000
34 43 34 43
7,000
35 44 35 43
8,000
36 44 36 44
9,000
37 45 37 44
10,000
38 46 38 45
11,000
39 47 39 45
12,000
40 47 40 46
13,000
41 48 41 47
14,000
42 48 42 47
Performance data (cont)
FLOW (cfm)
0
0.1
0.2
0.3
0.4
0.5
STATIC PRESSURE (in. wg)
2 FANS
OPERATING
1 FAN
OPERATING
2500
2000
1500
1000
500
0
5000
4000
3000
2000
1000
0
0
0.1
0.2
0.3
0.4
0.5
STATIC PRESSURE (in. wg)
FLOW (cfm)
2 FANS
OPERATING
1 FAN
OPERATING
50
40
30
20
10
0
0
0.25
0.5
0.75 1
FLOW (CFM)
STATIC PRESSURE (in. wg)
3 TO 6 TON
7 1/2 TO 12 1/2 TON
0.25
0.20
0.15
0.10
0.05
0.00
1200
2000
2800
3600 4400
FLOW (CFM)
STATIC PRESSURE (in. wg)
3 TO 6 TON
7 1/2 TO 12 1/2 TON
0.35
0.30
ECONOMI$ER POWER EXHAUST
PERFORMANCE (48HJ004-007)
ECONOMI$ER POWER EXHAUST
PERFORMANCE (48HJ008-014)
ECONOMI$ER OUTDOOR-AIR LEAKAGE ECONOMI$ER RETURN-AIR PRESSURE DROP
ELEVATION
MAXIMUM HEATING VALUE
(Btu/ft
3
)
0-2000
1100
2001-3000
1050
3001-4000
1000
4001-5000
950
5001-6000
900
*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 sea level.
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.
ALTITUDE DERATING FACTOR* — 48HJ004-014
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