Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 43

Table 9--Model 58MXA Orifice Size and Manifold Pressure for Correct Input
For Use with 040 through 120 Size Furnaces Only
(Tabulated Data is Based on 20,000 Btuh per Burner, Derated 2% for Each 1000 Ft Above Sea Level) *
ALTITUDE
RANGE
(FT)
"13
0
(3
to
r_
2000
0%
derate
ALTITUDE
RANGE
(Ft)
U.S.A.
Altitudes
200i to
=_ 3000
_3 or
Canada
r_ Altitudes
2001 to
D 4500
5%
derate
ALTITUDE
RANGE
(Ft)
>, 300t
O
<.. to
m
D 4000
7%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
850
875
900
925
950
075
i000
i025
i050
i075
II00
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btuicu ft)
775
800
825
850
875
000
925
950
075
i 000
i025
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btuicu ft)
750
775
800
825
850
875
900
025
050
075
i 000
0.58
"_rifice Manifold
No. Pressure
43 3.7
43 3.5
44 3.7
44 3.5
44 3.4
44 3.2
45 3.7
45 3.5
45 3.3
45 3.2
47 3.6
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.8
44 3.6
44 3.4
44 3.2
45 3.7
45 3.5
45 3.3
45 3.1
45 3.0
0.58
Orifice Manifold
No. Pressure
43 3.7
43 3.5
44 3.7
44 3.5
44 3.3
45 3.8
45 3.6
45 3.4
45 3.2
45 3.0
45 2.9
SPECIFIC GRAVITY OF NATURAL GAS
0.50
Orifice Manifold
No. Pressure
43 3.8
43 3.6
43 3.4
44 3.7
44 3.5
44 3.3
45 3.8
45 3.6
45 3.4
45 3.3
47 3.7
0.52 0.54 0.65
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
42 3.2 42 3.3 42 3.4
43 3.7 43 3.8 42 3.2
43 3.5 43 3.6 43 3.7
44 3.8 43 3.4 43 3.5
44 3.6 44 3.7 44 3.8
44 3.4 44 3.5 44 3.6
44 3.2 44 3.4 44 3.5
45 3.7 44 3.2 44 3.3
45 3.5 45 3.7 45 3.8
45 3.4 45 3.5 45 3.5
45 3.2 45 3.4 45 3.5
SPECIFIC GRAVITY OF NATURAL GAS
0.50 0.52 0.54 0.65
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure
42 3.2 42 3.3 42 3.4 42 3.5
43 3.7 43 3.8 42 3.2 42 3.3
43 3.4 43 3.6 43 3.7 43 3.8
44 3.7 44 3.8 43 3.5 43 3.6
44 3.5 44 3.6 44 3.7 43 3.4
44 3.3 44 3.4 44 3.5 44 3.6
45 3.8 44 3.2 44 3.3 44 3.4
45 3.6 45 3.7 45 3.8 44 3.3
45 3.4 45 3.5 45 3.6 45 3.8
45 3.2 45 3.4 45 3.5 45 3.5
45 3.t 45 3.2 45 3.3 45 3.4
SPECIFIC GRAVITY OF NATURAL GAS
0.50
Orifice Manifold
No. Pressure
43 3.8
43 3.6
43 3.4
44 3.6
44 3.4
44 3.2
45 3.7
45 3.5
45 3.3
45 3.2
45 3.0
0.52 0.54 0.55
Orifice Manifotd Orifice Manifotd Orifice Manifotd
No. Pressure No. Pressure No. Pressure
42 3.3 42 3.4 42 3.5
43 3.7 43 3.8 42 3.2
43 3.5 43 3.6 43 3.7
44 3.8 43 3.4 43 3.5
44 3.5 44 3.7 44 3.8
44 3.3 44 3.5 44 3.6
45 3.8 44 3.3 44 3.4
45 3.6 45 3.7 44 3.2
45 3.4 45 3.5 45 3.7
45 3.3 45 3.4 45 3.5
45 3.1 45 3.2 45 3.3
* Orifice numbers 45 shown in BOLD are factory installed
Percents of derate are based on midpoints of U.S. altitude ranges
43