Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 41

TABLE 9—Model 58MXA Orifice Size and Manifold Pressure for Correct Input (Continued)
(Tabulated Data Based on 20,000 Btuh per Burner, Derated 2 Percent for Each 1000 ft Above Sea Level)*
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 45 shown in BOLD are factory installed.
DO NOT redrill orifices. Improper drilling (burrs, out-of-
round holes, etc.) can cause excessive burner noise and
misdirection of burner flames. This can result in flame
impingement of burners and heat exchangers causing failures.
(See Fig. 58.)
e. Replace gas valve regulator adjustment screw cap.
f. Replace burner enclosure front and verify adjusted gas
input rate using method outlined in item 3.
g. Look through sight glass in burner enclosure and check
burner flame. Burner flame should be clear blue, almost
transparent. (See Fig. 59.)
for Use With 040 Through 120 Size Furnaces Only
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.7 43
43 3.4 43
44 3.7 44
44 3.5 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
45 3.1 45
45 3.0 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.6 43
43 3.4 43
44 3.6 44
44 3.4 44
44 3.2 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
45 2.9 45
45 2.7 45
45 2.6 45
45 2.5 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
42 3.2 42
43 3.6 43
44 3.8 43
44 3.6 44
44 3.3 44
45 3.8 44
45 3.5 45
45 3.3 45
45 3.1 45
45 3.0 45
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.8 42 3.2
3.5 43 3.7
3.8 43 3.4
3.6 44 3.7
3.4 44 3.5
3.8 44 3.3
3.6 45 3.7
3.4 45 3.5
3.2 45 3.3
3.1 45 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.7 42 3.2
3.5 43 3.6
3.7 43 3.4
3.5 44 3.6
3.3 44 3.4
3.7 44 3.2
3.5 45 3.6
3.3 45 3.4
3.1 45 3.3
3.0 45 3.1
2.8 45 2.9
2.7 45 2.8
2.5 45 2.6
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.3 42 3.4
3.7 43 3.8
3.4 43 3.6
3.7 44 3.8
3.4 44 3.6
3.2 44 3.3
3.7 45 3.8
3.4 45 3.6
3.2 45 3.4
3.1 45 3.2
3. Verify natural gas input rate by clocking gas meter.
NOTE: Be sure all pressure tubing, combustion-air and vent
pipes, and burner enclosure front are in place when checking input
by clocking gas meter.
a. Calculate high-altitude adjustment (if required).
UNITED STATES
At altitudes above 2000 ft, this furnace has been approved
for a 2 percent derate for each 1000 ft above sea level. See
Table 11 for derate multiplier factor.
CANADA
At installation altitudes from 2001 to 4500 ft, this furnace
must be derated 5 percent by an authorized Gas Conversion
41
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.8 42
43 3.5 43
44 3.8 43
44 3.6 44
44 3.4 44
44 3.2 44
45 3.6 45
45 3.4 45
45 3.3 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.7 43
43 3.5 43
44 3.7 43
44 3.5 44
44 3.3 44
45 3.8 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
45 2.9 45
45 2.7 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.7 43
43 3.4 43
44 3.7 44
44 3.4 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
Manifold
Pressure
3.4
3.2
3.7
3.4
3.7
3.5
3.3
3.8
3.6
3.4
Manifold
Pressure
3.4
3.8
3.6
3.4
3.6
3.4
3.2
3.7
3.5
3.3
3.1
2.9
2.8
Manifold
Pressure
3.6
3.3
3.8
3.5
3.8
3.5
3.3
3.8
3.6
3.4