Carrier 58MTB - Page 53

Table 14—Model 58MTB Orifice Size and High/Low-Heat Manifold Pressures for Correct Inputs (Continued)
for Use With 060 Through 120 Size Furnaces Only
(Tabulated Data Based on 20,000/13,000 Btuh per Burner,
Derated 2 Percent for Each 1000 ft Above Sea Level)*
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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
4001
to
5000
9%
derate
725 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4
750 44 3.4/1.4 43 3.5/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4
775 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4 43 3.5/1.5 43 3.7/1.5
800 44 3.51.5 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4
825 44 3.2/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5 44 3.7/1.6
850 45 3.5/1.5 45 3.8/1.6 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5
875 45 3.3/1.4 45 3.6/1.5 45 3.7/1.6 44 3.2/1.3 44 3.3/1.4
900 45 3.3/1.4 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5 45 3.8/1.6
925 47 3.7/1.6 45 3.2/1.4 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5
950 47 3.5/1.5 47 3.6/1.5 45 3.2/1.3 45 3.3/1.4 45 3.4/1.4
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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
5001
to
6000
11%
derate
700 43 3.6/1.5 43 3.7/1.6 42 3.2/1.3 42 3.3/1.4 42 3.4/1.4
725 43 3.4/1.4 43 3.5/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6
750 44 3.6/1.5 44 3.7/1.6 43 3.4/1.4 43 3.5/1.5 43 3.6/1.5
775 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5 44 3.7/1.6 43 3.4/1.4
800 44 3.2/1.3 44 3.3/1.5 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
825 45 3.6/1.5 45 3.7/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.4
850 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5 45 3.8/1.6 44 3.2/1.4
875 45 3.2/1.4 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5 45 3.7/1.5
900 47 3.6/1.5 47 3.7/1.6 45 3.3/1.4 45 3.4/1.4 45 3.5/1.5
925 47 3.4/1.4 47 3.5/1.5 47 3.7/1.5 45 3.2/1.3 45 3.3/1.4
950 48 3.7/1.6 48 3.8/1.6 47 3.5/1.5 47 3.6/1.5 47 3.7/1.6
975 48 3.5/1.5 48 3.6/1.5 48 3.8/1.6 47 3.4/1.4 47 3.5/1.5
1000 48 3.3/1.4 48 3.5/1.5 48 3.6/1.5 48 3.7/1.6 48 3.8/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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
6001
to
7000
13%
derate
650 42 3.2/1.3 42 3.3/1.4 42 3.4/1.4 42 3.5/1.5 42 3.6/1.6
675 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
700 44 3.8/1.6 43 3.4/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6
725 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6 43 3.4/1.4 43 3.5/1.5
750 44 3.3/1.4 44 3.4/1.5 44 3.6/1.5 44 3.7/1.6 44 3.8/1.6
775 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
800 45 3.5/1.5 45 3.7/1.5 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4
825 45 3.3/1.4 45 3.4/1.5 45 3.6/1.5 45 3.7/1.6 45 3.8/1.6
850 47 3.7/1.6 45 3.2/1.4 45 3.4/1.4 45 3.5/1.5 45 3.6/1.5
875 47 3.5/1.5 47 3.6/1.5 45 3.2/1.3 45 3.3/1.4 45 3.4/1.4
* Orifice numbers shown in shading are factory installed.
NOTE: Percents of derate are based on midpoints of U.S. altitude ranges.
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