Carrier Weathermaster 48HJD Series Product Data page 50

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