Carrier 58MXA - Page 34

Table 7—Model 58MXA Orifice Size and Manifold Pressure for Correct Input
(Tabulated Data Based on 20,000 Btuh per Burner, Derated 2% for Each 1000 Ft Above Sea Level)
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. and Canada
850 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
875 43 3.5 43 3.6 43 3.7 43 3.8 42 3.2
900 44 3.7 43 3.4 43 3.5 43 3.6 43 3.7
0 925 44 3.5 44 3.7 44 3.8 43 3.4 43 3.5
950 44 3.4 44 3.5 44 3.6 44 3.7 44 3.8
to 975 44 3.2 44 3.3 44 3.4 44 3.5 44 3.6
1000 45 3.7 45 3.8 44 3.2 44 3.4 44 3.5
2000 1025 45 3.5 45 3.6 45 3.7 44 3.2 44 3.3
1050 45 3.3 45 3.4 45 3.6 45 3.7 45 3.8
1075 45 3.2 45 3.3 45 3.4 45 3.5 45 3.6
1100 47 3.6 47 3.7 45 3.2 45 3.4 45 3.5
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. and Canada
U.S.A. 775 43 3.8 42 3.2 42 3.3 42 3.4 42 3.5
Altitudes 800 43 3.5 43 3.7 43 3.8 42 3.2 42 3.3
2001 825 44 3.8 43 3.4 43 3.6 43 3.7 43 3.8
to 850 44 3.6 44 3.7 44 3.8 43 3.5 43 3.6
3000 875 44 3.4 44 3.5 44 3.6 44 3.7 43 3.4
or 900 44 3.2 44 3.3 44 3.4 44 3.5 44 3.6
Canada 925 45 3.7 45 3.8 44 3.2 44 3.3 44 3.4
Altitudes 950 45 3.5 45 3.6 45 3.7 45 3.8 44 3.3
2000 975 45 3.3 45 3.4 45 3.5 45 3.6 45 3.8
to 1000 45 3.1 45 3.2 45 3.4 45 3.5 45 3.6
4500 1025 45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
750 43 3.7 43 3.8 42 3.3 42 3.4 42 3.5
775 43 3.5 43 3.6 43 3.7 43 3.8 42 3.2
800 44 3.7 43 3.4 43 3.5 43 3.6 43 3.7
3001 825 44 3.5 44 3.6 44 3.8 43 3.4 43 3.5
850 44 3.3 44 3.4 44 3.5 44 3.7 44 3.8
to 875 45 3.8 44 3.2 44 3.3 44 3.5 44 3.6
900 45 3.6 45 3.7 45 3.8 44 3.3 44 3.4
4000 925 45 3.4 45 3.5 45 3.6 45 3.7 44 3.2
950 45 3.2 45 3.3 45 3.4 45 3.5 45 3.7
975 45 3.0 45 3.2 45 3.3 45 3.4 45 3.5
1000 45 2.9 45 3.0 45 3.1 45 3.2 45 3.3
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
725 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
750 43 3.4 43 3.5 43 3.7 43 3.8 42 3.2
775 44 3.7 44 3.8 43 3.4 43 3.5 43 3.7
4001 800 44 3.5 44 3.6 44 3.7 44 3.8 43 3.4
825 44 3.2 44 3.4 44 3.5 44 3.6 44 3.7
to 850 45 3.7 45 3.8 44 3.3 44 3.4 44 3.5
875 45 3.5 45 3.6 45 3.7 44 3.2 44 3.3
5000 900 45 3.3 45 3.4 45 3.5 45 3.6 45 3.8
925 45 3.1 45 3.2 45 3.3 45 3.4 45 3.6
950 45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
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