Carrier 58MTA Installation, Start-Up, And Operating Instructions Manual page 45

TABLE 10—MODEL 58MTA ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURES
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 AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
725
750
775
4001
800
to
825
5000
850
9%
875
derate
900
925
950
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
700
725
750
775
800
5001
825
to
6000 850
11%
875
derate
900
925
950
975
1000
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
650
675
700
6001
725
to
750
7000
775
13%
800
derate
825
850
875
* Orifice numbers shown in shading are factory installed.
NOTE: Percents of derate are based on midpoints of U.S. altitude ranges.
a. Obtain average gas heat value (at installed altitude) from
local gas supplier.
b. Obtain average gas specific gravity from local gas supplier.
c. Verify furnace model and size. Table 10 can only be used
for model 58MTA furnaces with heating inputs of
20,000/13,000 (High/Low) Btuh per burner.
d. Find installation altitude in Table 10.
NOTE: For Canada altitudes of 2001 to 4500 ft, use U.S.A.
altitudes of 2001 to 3000 ft in Table 10.
e. Find closest natural gas heat value and specific gravity on
Table 10.
FOR CORRECT INPUTS (Continued)
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.7/1.5 43
44 3.4/1.4 43
44 3.7/1.6 44
44 3.51.5 44
44 3.2/1.4 44
45 3.5/1.5 45
45 3.3/1.4 45
45 3.3/1.4 45
47 3.7/1.6 45
47 3.5/1.5 47
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.6/1.5 43
43 3.4/1.4 43
44 3.6/1.5 44
44 3.4/1.4 44
44 3.2/1.3 44
45 3.6/1.5 45
45 3.4/1.4 45
45 3.2/1.4 45
47 3.6/1.5 47
47 3.4/1.4 47
48 3.7/1.6 48
48 3.5/1.5 48
48 3.3/1.4 48
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
42 3.2/1.3 42
43 3.6/1.5 43
44 3.8/1.6 43
44 3.6/1.5 44
44 3.3/1.4 44
45 3.8/1.6 44
45 3.5/1.5 45
45 3.3/1.4 45
47 3.7/1.6 45
47 3.5/1.5 47
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.8/1.6 42 3.2/1.4
3.5/1.5 43 3.7/1.5
3.8/1.6 43 3.4/1.4
3.6/1.5 44 3.7/1.6
3.4/1.4 44 3.5/1.5
3.8/1.6 44 3.3/1.4
3.6/1.5 45 3.7/1.6
3.4/1.4 45 3.5/1.5
3.2/1.4 45 3.3/1.4
3.6/1.5 45 3.2/1.3
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.7/1.6 42 3.2/1.3
3.5/1.5 43 3.6/1.5
3.7/1.6 43 3.4/1.4
3.5/1.5 44 3.6/1.5
3.3/1.5 44 3.4/1.4
3.7/1.6 44 3.2/1.4
3.5/1.5 45 3.6/1.5
3.3/1.4 45 3.4/1.5
3.7/1.6 45 3.3/1.4
3.5/1.5 47 3.7/1.5
3.8/1.6 47 3.5/1.5
3.6/1.5 48 3.8/1.6
3.5/1.5 48 3.6/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.3/1.4 42 3.4/1.4
3.7/1.6 43 3.8/1.6
3.4/1.5 43 3.6/1.5
3.7/1.6 44 3.8/1.6
3.4/1.5 44 3.6/1.5
3.2/1.4 44 3.3/1.4
3.7/1.5 45 3.8/1.6
3.4/1.5 45 3.6/1.5
3.2/1.4 45 3.4/1.4
3.6/1.5 45 3.2/1.3
f. Follow heat value and specific gravity lines to point of
intersection to find orifice size and manifold pressure
settings for proper operation.
45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.3/1.4 42
43 3.8/1.6 42
43 3.5/1.5 43
44 3.8/1.6 43
44 3.6/1.5 44
44 3.4/1.4 44
44 3.2/1.3 44
45 3.6/1.5 45
45 3.4/1.5 45
45 3.3/1.4 45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.3/1.4 42
43 3.7/1.6 43
43 3.5/1.5 43
44 3.7/1.6 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.8/1.6 44
45 3.6/1.5 45
45 3.4/1.4 45
45 3.2/1.3 45
47 3.6/1.5 47
47 3.4/1.4 47
48 3.7/1.6 48
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.5/1.5 42
42 3.2/1.4 42
43 3.7/1.6 43
43 3.4/1.4 43
44 3.7/1.6 44
44 3.4/1.5 44
44 3.2/1.4 44
45 3.7/1.6 45
45 3.5/1.5 45
45 3.3/1.4 45
Manifold
Pressure
3.4/1.4
3.2/1.4
3.7/1.5
3.4/1.4
3.7/1.6
3.5/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.4/1.4
Manifold
Pressure
3.4/1.4
3.8/1.6
3.6/1.5
3.4/1.4
3.6/1.5
3.4/1.4
3.2/1.4
3.7/1.5
3.5/1.5
3.3/1.4
3.7/1.6
3.5/1.5
3.8/1.6
Manifold
Pressure
3.6/1.6
3.3/1.4
3.8/1.6
3.5/1.5
3.8/1.6
3.5/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.4/1.4