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

Table 10—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)
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
725
750
775
800
4001
825
to
850
5000
875
900
925
950
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
700
725
750
775
800
825
5001
to 850
6000
875
900
925
950
975
1000
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
650
675
700
725
6001
750
to
775
7000
800
825
850
875
*Orifice numbers 43 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. 51.)
d. Replace gas valve regulator adjustment screw cap.
e. Replace burner enclosure front and verify adjusted gas
input rate using method outlined in item 3.
f. Look through sight glass in burner enclosure and check
burner flame. Burner flame should be clear blue, almost
transparent. (See Fig. 52.)
for Use With 140 Through 120 Size Furnaces Only
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
42 3.7 42
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
41 3.5 41
42 3.7 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.5 43
43 2.3 43
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
41 3.8 40
41 3.5 41
42 3.6 42
42 3.4 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.7 41 3.8
3.8 41 3.6
3.6 42 3.7
3.4 42 3.5
3.2 42 3.3
3.6 43 3.8
3.4 43 3.6
3.3 43 3.4
3.1 43 3.2
3.9 43 3.0
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.7 41 3.8
3.8 41 3.5
3.5 42 3.7
3.3 42 3.4
3.8 42 3.2
3.6 43 3.7
3.4 43 3.5
3.2 43 3.3
3.0 43 3.1
2.8 43 2.9
2.7 43 2.8
2.6 43 2.6
2.4 43 2.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.6 40 3.7
3.6 41 3.7
3.7 41 3.5
3.5 42 3.6
3.3 42 3.4
3.7 43 3.8
3.5 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
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 2000 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.
40 3.6 40
41 3.7 41
42 3.8 41
42 3.6 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
40 3.6 40
41 3.6 41
42 3.8 41
42 3.5 42
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
40 3.8 39
40 3.6 40
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
Manifold
Pressure
3.8
3.8
3.6
3.7
3.5
3.3
3.8
3.6
3.4
3.2
Manifold
Pressure
3.7
3.8
3.5
3.7
3.4
3.2
3.7
3.5
3.3
3.1
3.0
2.8
2.7
Manifold
Pressure
3.7
3.7
3.7
3.8
3.6
3.4
3.8
3.6
3.4
3.2