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Carrier 58DXT Operating Instructions Manual page 18

Downflow 2-speed, 2-stage, induced-combustion gas furnace
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Table 9—Model 58DXT Orifice Size* and Manifold Pressure for Correct Input
(TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER,
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
725
750
775
4001
800
825
to
850
875
5000
900
925
950
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
700
725
750
775
5001
800
825
to
850
875
6000
900
925
950
975
1000
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
650
675
700
6001
725
750
to
775
800
7000
825
850
875
* Orifice numbers shown in BOLD are factory installed.
DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL)
0.58
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.8/1.6
43
44
3.5/1.5
44
44
3.3/1.4
44
45
3.7/1.5
44
46
3.7/1.5
46
46
3.5/1.4
46
47
3.7/1.5
46
47
3.5/1.5
47
48
3.8/1.6
47
48
3.6/1.5
48
0.58
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.5/1.5
44
44
3.3/1.4
44
45
3.7/1.5
44
46
3.6/1.5
46
46
3.4/1.4
46
47
3.7/1.5
47
47
3.4/1.4
47
48
3.7/1.5
48
48
3.5/1.4
48
48
3.3/1.4
48
49
3.7/1.5
49
49
3.5/1.4
49
49
3.3/1.4
49
0.58
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
44
3.5/1.5
44
44
3.3/1.4
44
45
3.7/1.5
44
46
3.6/1.5
46
47
3.8/1.6
46
47
3.6/1.5
47
48
3.8/1.6
47
48
3.6/1.5
48
48
3.4/1.4
48
49
3.8/1.6
48
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.4/1.4
43
3.5/1.4
3.6/1.5
44
3.8/1.6
3.4/1.4
44
3.5/1.5
3.2/1.3
44
3.3/1.4
3.8/1.6
45
3.8/1.6
3.6/1.5
46
3.7/1.5
3.4/1.4
46
3.5/1.5
3.6/1.5
47
3.8/1.6
3.4/1.4
47
3.6/1.5
3.7/1.5
48
3.8/1.6
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.6/1.5
44
3.8/1.6
3.4/1.4
44
3.5/1.4
3.2/1.3
44
3.3/1.4
3.8/1.6
45
3.7/1.5
3.5/1.5
46
3.7/1.5
3.8/1.6
46
3.4/1.4
3.6/1.5
47
3.7/1.5
3.8/1.6
47
3.5/1.4
3.6/1.5
48
3.7/1.5
3.4/1.4
48
3.5/1.5
3.8/1.6
48
3.3/1.4
3.6/1.5
49
3.7/1.5
3.4/1.4
49
3.6/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.60
0.62
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.7/1.5
44
3.8/1.6
3.4/1.4
44
3.5/1.4
3.2/1.3
44
3.3/1.3
3.7/1.5
45
3.7/1.5
3.5/1.4
46
3.6/1.5
3.7/1.5
47
3.8/1.6
3.5/1.4
47
3.6/1.5
3.7/1.5
48
3.8/1.6
3.5/1.4
48
3.6/1.5
3.3/1.4
48
3.4/1.4
18
(Continued)
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
43
3.6/1.5
43
43
3.4/1.4
43
44
3.6/1.5
44
44
3.4/1.4
44
44
3.2/1.3
44
46
3.8/1.6
45
46
3.6/1.5
46
46
3.4/1.4
46
47
3.7/1.5
47
47
3.5/1.4
47
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
43
3.4/1.4
43
44
3.6/1.5
44
44
3.4/1.4
44
44
3.2/1.3
44
46
3.8/1.6
45
46
3.6/1.5
46
47
3.8/1.6
46
47
3.6/1.5
47
47
3.4/1.4
47
48
3.6/1.5
48
48
3.5/1.4
48
48
3.3/1.4
48
49
3.7/1.5
49
0.64
0.66
Manifold
Orifice
Orifice
Pressure
No.
No.
High/Low
43
3.4/1.4
43
44
3.6/1.5
44
44
3.4/1.4
44
45
3.8/1.6
44
46
3.7/1.5
46
46
3.5/1.4
46
47
3.7/1.5
47
47
3.5/1.4
47
48
3.7/1.5
47
48
3.5/1.5
48
Manifold
Pressure
High/Low
3.7/1.5
3.5/1.4
3.7/1.5
3.5/1.5
3.3/1.4
3.8/1.6
3.7/1.5
3.5/1.5
3.8/1.6
3.6/1.5
Manifold
Pressure
High/Low
3.5/1.4
3.7/1.5
3.5/1.4
3.3/1.4
3.7/1.5
3.7/1.5
3.5/1.4
3.7/1.5
3.5/1.4
3.8/1.6
3.6/1.5
3.4/1.4
3.8/1.6
Manifold
Pressure
High/Low
3.5/1.4
3.7/1.5
3.5/1.4
3.2/1.3
3.8/1.6
3.6/1.5
3.8/1.6
3.6/1.5
3.4/1.4
3.6/1.5
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