Carrier 58EFB Installation, Start-Up, And Operating Instructions Manual page 15

Table 5—Model 58EFB Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitudes up to 2000 ft and 25,000 Btuh Per Burner)
GAS HEAT
VALUE 0.56
Orf. Mnfld Orf.
(Btu/cu ft)
No. Press No.
37 3.3 37
860 38 3.6 38
— — —
37 3.2 37
875 38 3.5 38
39 3.8 —
38 3.4 37
890 39 3.7 38
— — 39
38 3.3 38
905 39 3.6 39
40 3.8 —
38 3.2 38
920 39 3.4 39
40 3.7 40
39 3.3 38
935 40 3.5 39
41 3.8 40
39 3.2 39
950 40 3.4 40
41 3.7 —
40 3.3 39
965 41 3.6 40
— — 41
40 3.2 40
980 41 3.5 41
— — —
41 3.4 40
995 42 3.8 41
— — —
41 3.3 41
1010 42 3.7 42
— — —
41 3.2 41
1025 42 3.6 42
— — —
42 3.4 41
1040 — — 42
— — —
42 3.4 42
1055 — — —
— — —
42 3.3 42
1070 — — —
— — —
42 3.2 42
1085 — — —
— — —
43 3.8 42
1100 — — —
— — —
2. Determine natural gas input rate by clocking gas meter.
NOTE: Be sure all pressure tubing, vent pipes, and burner
enclosure plates are in place when checking input.
a. Obtain average yearly heat value for local gas supply.
NOTE: Be sure heating value of gas used for calculations is
correct for your altitude. Consult local gas utility for altitude
adjustments of gas heating value.
b. Turn off all other gas appliances and pilots.
c. Start furnace and let it run for 3 minutes.
d. Measure time (in sec) for gas meter test dial to complete 1
revolution.
e. Refer to Table 6 for cu ft of gas per hr.
f. Multiply gas rate (cu ft/hr) by heating value (Btu/cu ft).
Obtain heating value from local gas utility.
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62
Mnfld Orf. Mnfld Orf.
Press No. Press No.
3.4 36 3.2 36
3.8 37 3.5 37
— — — —
3.3 37 3.4 36
3.6 38 3.8 37
— — — —
3.2 37 3.3 37
3.5 38 3.6 38
3.8 — — —
3.4 37 3.2 37
3.7 38 3.5 38
— 39 3.8 —
3.3 38 3.4 37
3.6 39 3.7 38
3.8 — — 39
3.2 38 3.3 38
3.4 39 3.6 39
3.7 40 3.8 —
3.3 38 3.2 38
3.6 39 3.5 39
— 40 3.7 40
3.2 39 3.3 38
3.4 40 3.6 39
3.7 — — 40
3.3 39 3.2 39
3.6 40 3.5 40
— 41 3.7 —
3.2 40 3.4 39
3.5 41 3.6 40
— — — 41
3.4 40 3.3 39
3.8 41 3.5 40
— — — 41
3.3 40 3.2 40
3.7 41 3.4 41
— 42 3.8 —
3.2 41 3.3 40
3.6 42 3.7 41
— — — 42
3.5 41 3.2 41
— 42 3.6 42
— — — —
3.4 42 3.5 41
— — — 42
— — — —
3.3 42 3.4 41
— — — 42
— — — —
3.2 42 3.3 42
— — — —
— — — —
0.64 0.66
Mnfld Orf. Mnfld Orf. Mnfld
Press No. Press No. Press
3.3 36 3.4 36 3.5
3.7 37 3.8 — —
— — — — —
3.2 36 3.3 36 3.4
3.5 37 3.6 37 3.8
— — — — —
3.4 36 3.2 36 3.3
3.8 37 3.5 37 3.6
— — — — —
3.3 37 3.4 36 3.2
3.6 38 3.8 37 3.5
— — — — —
3.2 37 3.3 37 3.4
3.5 38 3.6 38 3.7
3.8 — — — —
3.4 37 3.2 37 3.3
3.7 38 3.5 38 3.6
— 39 3.8 — —
3.3 38 3.4 37 3.2
3.6 39 3.7 38 3.5
3.8 — — 39 3.8
3.2 38 3.3 38 3.4
3.5 39 3.6 39 3.7
3.7 40 3.8 — —
3.4 38 3.2 38 3.3
3.6 39 3.5 39 3.6
— 40 3.7 40 3.8
3.3 39 3.4 38 3.2
3.5 40 3.6 39 3.5
3.8 — — 40 3.7
3.2 39 3.3 39 3.4
3.4 40 3.5 40 3.6
3.6 41 3.8 — —
3.3 39 3.2 39 3.3
3.5 40 3.4 40 3.5
— 41 3.7 41 3.8
3.2 40 3.3 39 3.2
3.4 41 3.6 40 3.4
3.8 — — 41 3.7
3.3 40 3.2 40 3.3
3.7 41 3.4 41 3.6
— 42 3.8 — —
3.2 41 3.4 40 3.2
3.6 42 3.7 41 3.5
— — — 42 3.8
3.2 41 3.3 41 3.4
3.5 42 3.6 42 3.7
— — — — —
3.4 41 3.2 41 3.3
— 42 3.5 42 3.6
— — — — —
EXAMPLE:
Btu heating input = Btu/cu ft X cu ft/hr
Heating value of gas = 1070 Btu/cu ft
Time for 1 revolution of 2-cu-ft dial = 72 sec
Gas rate = 100 cu ft/hr (from Table 6)
Btu heating input = 100 X 1070 = 107,000 Btuh.
g. Measured gas input must not exceed gas input on unit
rating plate.
(1.) High-altitude installations (United States only)—Gas
input on rating plate is for altitudes up to 2000 ft.
Ratings for altitudes over 2000 ft must be 4 percent
less for each 1000 ft above sea level. To obtain the
altitude adjusted rating, adjust the manifold pressure
(see item 3), and replace the main burner orifices as
15
0.68 0.70
Orf. Mnfld Orf. Mnfld Orf.
No. Press No. Press No.
35 3.2 34 3.2 34
36 3.6 35 3.3 35
— — 36 3.7 —
36 3.5 35 3.2 34
— — 36 3.6 35
— — — — 36
36 3.4 36 3.5 35
37 3.7 — — 36
— — — — —
36 3.3 36 3.4 36
37 3.6 37 3.7 37
— — — — —
36 3.2 36 3.3 36
37 3.5 37 3.6 37
— — — — —
37 3.4 36 3.2 36
38 3.7 37 3.5 37
— — 38 3.8 —
37 3.3 37 3.4 36
38 3.6 38 3.7 37
— — — — 38
37 3.2 37 3.3 37
38 3.5 38 3.6 38
39 3.8 — — —
38 3.4 37 3.2 37
39 3.7 38 3.5 38
— — 39 3.8 —
38 3.3 38 3.4 37
39 3.6 39 3.7 38
40 3.8 — — 39
38 3.2 38 3.3 38
39 3.5 39 3.6 39
40 3.7 40 3.8 —
39 3.4 38 3.2 38
40 3.6 39 3.5 39
— — 40 3.7 40
39 3.3 39 3.4 38
40 3.5 40 3.6 39
41 3.8 — — 40
39 3.2 39 3.3 39
40 3.4 40 3.5 40
41 3.7 41 3.8 —
40 3.3 39 3.2 39
41 3.6 40 3.4 40
— — 41 3.7 41
40 3.2 40 3.3 39
41 3.5 41 3.6 40
42 3.8 — — 41
41 3.4 40 3.2 40
42 3.7 41 3.5 41
— — — — —
0.72
Mnfld
Press
3.3
3.4
—
3.2
3.3
3.7
3.2
3.6
—
3.5
3.8
—
3.4
3.7
—
3.3
3.6
—
3.2
3.5
3.8
3.4
3.7
—
3.3
3.6
—
3.2
3.5
3.8
3.4
3.7
—
3.3
3.6
3.8
3.2
3.5
3.7
3.4
3.6
—
3.3
3.5
3.8
3.2
3.4
3.7
3.3
3.6
—