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)
ST
A
TIC 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