Carrier 58RAV Installation, Start-Up, And Operating Instructions Manual page 13

Table 7—Model 58RAV Orifice Size and Manifold Pressure for Correct Input Rate*
(Tabulated Data Based on Altitude Up to 2000 ft and 23,000 Btuh Per Burner)
GAS HEAT VALUE 0.56
(BTU/CU FT)
Orf Mnfld
No. Press.
40 3.2
860 41 3.5
— —
— —
875 41 3.3
42 3.7
— —
890 41 3.2
42 3.6
— —
905 — —
42 3.5
— —
920 — —
42 3.4
42 3.3
935 — —
— —
42 3.2
950 — —
— —
— —
965 43 3.7
— —
— —
980 43 3.6
— —
— —
995 43 3.5
— —
— —
1010 43 3.4
— —
— —
1025 43 3.3
44 3.8
— —
1035 43 3.2
44 3.7
— —
1055 — —
44 3.6
— —
1070 — —
44 3.5
— —
1085
44 3.4
— —
1100
44 3.3
*For size 135-20 only, deduct 0.1-in. wc from manifold pressure shown in table due to 22,500 Btuh per burner input. If resultant manifold pressure falls below 3.2-in. wc,
change orifice size.
a. Place duct thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not "see" heat
exchangers so that radiant heat does not affect thermometer
readings. This is particularly important with straight-run
ducts.
b. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine tem-
perature rise.
c. Adjust air temperature rise by adjusting blower speed.
Increase blower speed to reduce temperature rise. Decrease
blower speed to increase temperature rise.
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62
Orf Mnfld Orf Mnfld Orf
No. Press. No. Press. No.
40 3.3 40 3.4 40
41 3.6 41 3.7 41
39 — 39 3.2 39
40 3.2 40 3.3 40
41 3.5 41 3.6 41
— — — — 39
— — 40 3.2 40
41 3.4 41 3.5 41
42 3.7 — — —
— — — — 40
41 3.2 41 3.4 41
42 3.6 42 3.7 —
— — — — —
— — 41 3.2 41
42 3.5 42 3.6 42
42 3.4 42 3.5 42
— — — — —
— — — — 41
42 3.3 42 3.4 42
— — — — —
— — — — —
42 3.2 42 3.3 42
— — — — —
— — — — —
— — 42 3.2 42
43 3.7 — — —
— — — — —
— — — — 42
43 3.6 43 3.8 —
— — — — —
— — — — —
43 3.5 43 3.6 43
— — — — —
— — — — —
43 3.4 43 3.5 43
— — — — —
— — — — —
43 3.3 43 3.4 43
44 3.8 — — —
— — — — —
43 3.2 43 3.3 43
44 3.7 44 3.8 —
— — — — —
— — 43 3.3 43
44 3.6 44 3.7 44
— — 43 3.2 43
44 3.5 44 3.6 44
— — — — 43
44 3.4 44 3.5 44
0.64 0.66
Mnfld Orf Mnfld Orf Mnfld
Press. No. Press. No. Press.
3.5 40 3.7 40 3.8
3.8 38 3.2 38 3.3
3.3 39 3.4 39 3.5
3.4 40 3.5 40 3.6
3.7 41 3.8 38 3.2
3.2 39 3.3 39 3.4
3.3 40 3.4 40 3.5
3.6 41 3.7 41 3.8
— 39 3.2 39 3.3
3.2 40 3.3 40 3.4
3.5 41 3.6 41 3.7
— — — 39 3.2
— 40 3.2 40 3.3
3.4 41 3.5 41 3.6
3.7 42 3.8 — —
3.6 42 3.7 42 3.8
— — — 40 3.2
3.2 41 3.4 41 3.5
3.5 42 3.6 42 3.7
— — — — —
— 41 3.2 41 3.3
3.4 42 3.5 42 3.6
— — — — —
— — — 41 3.2
3.3 42 3.4 42 3.5
— — — — —
— — — — —
3.2 42 3.3 42 3.4
— — — — —
— — — — —
— 42 3.2 42 3.3
3.6 — — — —
— — — — —
— — — 42 3.2
3.7 43 3.8 — —
— — — — —
— — — — —
3.6 43 3.7 43 3.8
— — — — —
— — — — —
3.5 43 3.6 43 3.7
— — — — —
— — — — —
3.4 43 3.5 43 3.6
3.8 — — — —
3.3 43 3.4 43 3.5
3.7 — — — —
3.2 43 3.3 43 3.4
3.6 44 3.7 — —
Disconnect the electrical power before changing the speed
tap. Failure to follow this warning could result in personal
injury.
d. To change blower motor speed selections for heating mode,
remove blower motor lead from control board HEAT
terminal. (See Fig. 11.) Select desired blower motor speed
lead from 1 of the other terminals and relocate it to HEAT
terminal. See Table 10 for lead color identification. Recon-
nect original lead on SPARE terminal.
Follow this same procedure for proper selection of COOL
speed selection.
13
0.68 0.70 0.72
Orf Mnfld Orf Mnfld Orf
No. Press. No. Press. No.
— — 37 3.2 37
38 3.4 38 3.5 38
39 3.6 39 3.8 —
40 3.8 — — —
38 3.3 38 3.4 38
39 3.5 39 3.6 39
40 3.6 40 3.7 40
— — 38 3.2 38
39 3.4 39 3.5 39
40 3.5 40 3.6 40
41 3.8 — — 38
39 3.3 39 3.4 39
40 3.4 40 3.5 40
41 3.7 41 3.8 —
39 3.2 39 3.3 39
— — 39 3.2 39
40 3.3 40 3.4 40
41 3.6 41 3.7 41
42 3.8 — — 39
40 3.2 40 3.3 40
41 3.5 41 3.6 41
42 3.7 42 3.8 —
— — 40 3.2 40
41 3.3 41 3.4 41
42 3.6 42 3.7 42
— — — — 44
41 3.2 41 3.3 41
42 3.5 42 3.6 42
— — — — —
— — 41 3.2 41
42 3.4 42 3.5 42
— — — — —
— — — — 41
42 3.3 42 3.4 42
— — — — —
— — — — —
42 3.2 42 3.3 42
— — — — —
— — — — —
— — 42 3.2 42
43 3.8 — — —
— — — — —
— — — — 42
43 3.7 43 3.8 —
— — — — —
43 3.6 43 3.7 43
— — — — —
43 3.5 43 3.6 43
— — — — —
Mnfld
Press.
3.2
3.6
—
—
3.4
3.7
3.8
3.3
3.6
3.7
3.2
3.5
3.6
—
3.4
3.3
3.5
3.8
3.2
3.4
3.7
—
3.3
3.5
3.8
3.2
3.4
3.7
—
3.3
3.6
—
3.2
3.5
—
—
3.4
—
—
3.3
—
—
3.2
—
—
3.8
—
3.7
—