Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual page 36

Table 11—Model 58MVP Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitude Up to 2000 ft and 20,000 Btuh High Heat/13,000 Btuh Low Heat Per Burner)
GAS HEAT
0.58
VALUE
Orf Heat
(BTU/CU FT)
No. High/Low
860 43 3.7/1.6
875 43 3.6/1.5
890 43 3.5/1.5
43 3.3/1.3
905
44 3.7/1.5
43 3.2/1.3
920
44 3.7/1.5
935 44 3.6/1.5
950 44 3.5/1.5
965 44 3.4/1.4
980 44 3.3/1.4
44 3.2/1.3
995
45 3.8/1.6
1010 45 3.7/1.6
45 3.6/1.5
1025
46 3.8/1.6
45 3.5/1.5
1040
46 3.7/1.6
45 3.4/1.4
1055
46 3.6/1.5
45 3.3/1.4
1070
46 3.5/1.5
45 3.2/1.4
1085 46 3.4/1.4
47 3.8/1.6
46 3.3/1.4
1100
47 3.7/1.6
h. Proceed to item 3. to adjust manifold pressure.
3. Adjust gas input.
NOTE: Manifold pressure must always be measured with the
burner enclosure front REMOVED. The gas meter must always be
clocked with the burner enclosure front INSTALLED. The gas
valve has been nominally set at 3.5-in. wc high heat and 1.5-in. wc
low heat for natural gas.
a. Remove burner enclosure front and caps that conceal
adjustment screws for gas valve regulator. (See Fig. 46.)
b. Turn setup switch SW-2 on control center to ON position.
(See Fig. 25.) This will keep furnace locked in low-heat
operation.
c. Turn low-heat adjusting screw (5/64 hex Allen wrench)
counterclockwise (out) to decrease input rate or clockwise
(in) to increase rate. When adjusting input rate, DO NOT
set manifold pressure less than 1.3-in. or more than 1.7-in.
wc for natural gas. Make any major adjustments by
changing main burner orifices.
d. Turn setup switch SW-2 to OFF position after low fire
adjustment.
e. Jumper R-W2 on control center thermostat connections.
(See Fig. 25.) This will keep furnace locked in high-heat
operations.
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orf Heat Orf Heat
No. High/Low No. High/Low
43 3.8/1.6 42 3.2/1.4
43 3.7/1.6 43 3.8/1.6
43 3.6/1.5 43 3.7/1.6
43 3.5/1.4 43 3.6/1.5
43 3.3/1.4
43 3.5/1.4
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3
44 3.3/1.4
45 3.8/1.6
45 3.7/1.6 44 3.2/1.3
45 3.6/1.5
45 3.7/1.6
46 3.8/1.6
45 3.5/1.5 45 3.6/1.5
46 3.7/1.6 46 3.8/1.6
45 3.4/1.4 45 3.5/1.5
46 3.6/1.5 46 3.7/1.6
45 3.3/1.4 45 3.4/1.5
46 3.5/1.5 46 3.6/1.5
45 3.2/1.4 45 3.4/1.4
46 3.4/1.4 46 3.5/1.5
0.64 0.66
Orf Heat Orf Heat
No. High/Low No. High/Low
42 3.3/1.4 42 3.4/1.5
42 3.2/1.4 42 3.3/1.4
43 3.8/1.6 42 3.2/1.4
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.5/1.5 43 3.6/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3 44 3.3/1.4
45 3.8/1.6 44 3.2/1.3
45 3.7/1.5
45 3.8/1.6
46 3.8/1.6
45 3.6/1.5
45 3.7/1.5
46 3.7/1.6
45 3.5/1.5 45 3.6/1.5
46 3.6/1.5 46 3.8/1.6
f. Turn high-heat adjusting screw (5/64 hex Allen wrench)
counterclockwise (out) to decrease input rate or clockwise
(in) to increase rate. When adjusting input rate, DO NOT
set manifold pressure less than 3.2-in. or more than 3.8-in.
wc for natural gas. Make any major adjustment by changing
main burner orifices.
Fig. 46—Redundant Automatic Gas Valve
NOTE: If orifices are changed, both high-heat and low-heat input
rate must be readjusted.
36
0.68 0.70
Orf Heat Orf Heat
No. High/Low No. High/Low
41 3.2/1.4 41 3.3/1.4
42 3.6/1.5 42 3.7/1.5
41 3.2/1.3
42 3.4/1.4
42 3.5/1.5
42 3.3/1.4 42 3.4/1.4
42 3.2/1.4 42 3.3/1.4
43 3.8/1.5 42 3.2/1.3
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.4/1.5 43 3.5/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.4 44 3.3/1.4
45 3.8/1.6 44 3.2/1.4
45 3.7/1.6 45 3.8/1.6
0.72
Orf Heat
No. High/Low
41 3.4/1.4
42 3.8/1.6
41 3.3/1.4
42 3.6/1.5
41 3.2/1.3
42 3.5/1.5
42 3.4/1.4
42 3.3/1.3
42 3.2/1.3
43 3.8/1.6
43 3.6/1.5
43 3.5/1.5
43 3.4/1.4
43 3.3/1.4
44 3.8/1.6
43 3.2/1.4
44 3.7/1.6
44 3.6/1.5
44 3.5/1.5
44 3.4/1.4
44 3.3/1.4
44 3.2/1.4
A93085