Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 47

Table 10--Model 58M×A Orifice Size and NaNfold Pressure for Correct input (Continued)
for Use With 140 Size Furnaces Only
(Tabulated Data Based on 23,000 Btuh per Burner, Derated 2"/. for Each 1000 Ft Above Sea Level) *
ALTITUDE
RANGE
(FT)
4001
C
o to
d}
:5 5000
9%
derate
ALTITUDE
RANGE
(ft)
500t
C
o
to
D $000
11%
derate
ALTITUDE
RANGE
(ft)
6001
C
o to
d}
7000
13%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
725
750
775
800
825
850
875
900
925
950
AVG GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
700
725
750
775
800
825
850
875
900
925
950
975
1000
AVG GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
850
675
700
725
750
775
800
825
850
875
0.58
'_rifice Manifold
No. Pressure
41 3.6
42 3.7
42 3.5
42 3.3
43 3,7
43 3.5
43 3.3
43 3.1
43 3.0
43 2.8
0.58
Orifice Manifold
No. Pressure
41 3.5
42 3.7
42 3.4
42 3.2
43 3,7
43 3.5
43 3,3
43 3.1
43 2.9
43 2.7
43 2.6
43 2.8
43 2.3
0.58
Orifice Manifold
No. Pressure
4I 3.8
41 3.5
42 3.6
42 3.4
43 3.8
43 3.6
43 3.4
43 3.2
43 3.0
43 2.8
SPECIFIC GRAVITY OF NATURAL GAS
0.00
Orifice Manifold
No. Pressure
41 3.7
42 3.8
42 3.6
42 3.4
42 3.2
43 3.6
43 3.4
43 3.3
43 3.1
43 2.9
0.62 0.64 0.66
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
4I 3.8 40 3.6 40 3.8
41 3.6 41 3.7 41 3.8
42 3.7 42 3.8 41 3.6
42 3.5 42 3.6 42 3.7
42 3.3 42 3.4 42 3.5
43 3,8 42 3.2 42 3.3
43 3.$ 43 3.7 43 3.8
43 3.4 43 3.5 43 3.6
43 3.2 43 3.3 43 3.4
43 3.0 43 3.t 43 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62 0.64 0.66
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure
41 3.7 41 3.8 40 3.6 40 3.7
42 3.8 41 3.5 41 3.6 41 3.8
42 3.5 42 3.7 42 3.8 41 3.5
42 3.3 42 3.4 42 3.5 42 3.7
43 3,8 42 3.2 42 3.3 42 3.4
43 3.0 43 3,7 43 3,8 42 3.2
43 3.4 43 3.5 43 3.8 43 3.7
43 3.2 43 3.3 43 3.4 43 3.5
43 3.0 43 3.t 43 3.2 43 3.3
43 2.8 43 2.9 43 3.0 43 3.t
43 2.7 43 2.8 43 2.9 43 3.0
43 2.6 43 2.6 43 2.7 43 2.8
43 2.4 43 2.5 43 2.0 43 2.7
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold
No. Pressure
40 3.6
41 3.6
42 3.7
42 3.5
42 3.3
43 3.7
43 3.5
43 3.3
43 3.t
43 2.9
0.62 0.64 0.66
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
40 3.7 40 3.8 39 3.7
41 3.7 40 3.6 40 3.7
41 3.5 41 3.6 41 3.7
42 3.6 42 3.7 42 3.8
42 3.4 42 3.5 42 3.6
43 3.8 42 3.3 42 3.4
43 3.6 43 3.7 43 3.8
43 3.4 43 3.5 43 3.6
43 3.2 43 3.3 43 3.4
43 3.0 43 3.t 43 3.2
* Orifice numbers 43 shown in BOLD are factory installed
Percents of derate are based on midpoints of U.S. altitude ranges
NOTE: Be sure all pressure robing, con_bustion-air and vent
pipes, and burner box cover flont are in place when checking input
by clocking gas meter.
EXAMPLE:
100,000 Btuh input furnace installed at 4300 ft.
Derate Furnace input Rate
Furnace Input Rate X Multiplier at Installation
at Sea Level Factor Altitude
100,000 X 0.91 91,000
47
a. Calcnlate high-altitude adjustment (if required).
UNITED STATES
At altitudes above 2000 fk this _hmace has been approved
for a 2 percent derate for each 1000 f_ above sea level See
Table 11 for derate multiplier _ctor.
CANADA
At installation altitudes between 2001 to 4500 ft, this
furnace must be derated 5 percent by an authorized Gas
Conversion Station or Dealer. To determine correct input
rate for altimdQ see example above and use 0.95 as derate
multiplier _hctor.
b. Reinstall burner box cover.