Carrier 58GSC - Manual (Page 3)

6. Check inlet natural gas pressure.
NOTE: This kit is to be used only when inlet gas pressure is
between 4.5- and 13.6-ins. wc.
a. Attach manometer at inlet pressure tap on gas sup­
ply side of furnace gas valve.
A CAUTION
Do not operate furnace more than one minute to check
inlet gas pressure as conversion is not complete at this
time.
b. Set room thermostat “call for heat.”
c. Turn gas supply manual shut-off valve on.
d. Turn furnace gas valve control knob to ON.
e. Turn electrical supply to ON.
f. When main burners have ignited, confirm proper
inlet gas pressure.
g. Turn furnace gas valve control knob to OFF.
h. Turn gas supply manual shut-off valve off.
i. Turn electric supply to furnace to OFF.
j. Remove manometer and replace plug in pressure
tap.
NOTE: Use propane gas-resistant pipe dope. Do not use
Teflon tape.
7. Attach gas control conversion label P/N 310148-302 to
cell panel.
8. Attach conversion rating plate P/N 310168-312 near
existing rating plate. See Fig. 1.
D. Check Furnace Operation and Make Necessary
Adjustments
1. Be sure main gas and electric supplies to furnace are
off.
2. Attach manometer at manifold pressure tap on down­
stream side of gas valve.
3. Set room thermostat to “caU for heat.”
A WARNING
Never use a match or other open flame to check for
leaks. Use a soap-and-water solution. A failure to heed
this warning could result in personal injury or death.
4.
5.
6 .
Turn gas supply manual shut-off valve on and check
inlet pressure tap plug for leaks.
Turn furnace gas valve control knob to ON and check
all threaded pipe connections for gas leaks.
Turn on electrical supply.
7. When pilot ignites, check pilot gas-supply tube connec­
tions for leaks. When main burners ignite, check mani­
fold orifices for gas leaks.
8. Determine gas input:
a. Turn off all other gas appliances and pilots.
b. Measure time (in seconds) for gas meter test dial to
complete one revolution.
c. Refer to Table 2 for cubic ft of gas per hour.
d. Multiply cubic ft/hour by Btu cubic ft. Obtain heat­
ing value from local gas utihty.
NOTE: Be sure heating value of gas used for calculations is
correct for your altitude. Consult local gas utility for alti­
tude adjustment of gas heating value.
High altitude:
The full input rating with No. 45 main burner natural gas
orifices is approved for altitudes up to 2000 ft. The input
rating for altitudes above 2000 ft must be reduced by 4%
for each 1000 ft above sea level. Consult the current edition
of the National Fuel Gas Code NFPA No. 54/ANSI Z223.1,
Part 8.1 and Appendix F Table F-4, for input adjustment
for high altitude.
e. Refer to unit rating plate for gas input rate. The
measured input must be within 2 percent of the rat­
ing plate input.
EXAMPLE:
Btuh heating input = Btu/cubic ft times cubic ft/
hour
Heating value of gas = 1070 Btu/cubic ft.
Time for one revolution of 2-cubic-ft dial = 72
seconds
Gas rate = 100 cubic ft/hour (from Table 2)
Btu heating input = 1070x 100 = 107,000 Btuh
9. To adjust input rate:
a. Remove cap that conceals adjustment screw for gas
valve regulator.
Turn adjustment screw either counterclockwise
(out) to decrease input or clockwise (in) to increase
rate. When adjusting input rate, do not set manifold
pressure above 3.8 or below 3.2-ins. wc. Make
any major adjustments by changing main burner
orifices.
b.
Table 2—Gas Rate (Cubic Ft/Hour)
Seconds SIZE OF TEST DIAL Seconds SIZE OF TEST DIAL
for One 1 2 5 for One 1 2 5
Revolution cu ft cu ft cu ft Revolution cu ft cu ft CU ft
10 360 720 1800 50 ' 72 144 360
11 327 655 1636 51 71 141 355
12 300 600 1500 52 69 138 346
13 277 555 1385 53 68 136 340
14 257 514 1286 54 67 133 333
15 240 480 1200 55 65 131 327
16 225 450 1125 56 64 129 321
17 212 424 1059 57 63 126 316
18 200 400 1000 58 62 124 310
19 189 379 947 59 61 122 305
20 180 360 900 60 60 120 300
21 171 343 857 62 58 116 290
22 164 327 818 64 56 112 281
23 157 313 783 66 54 109 273
24 150 300 750 68 53 106 265
25 144 288 720 70 51 103 257
26 138 277 692 72 50 100 250
27 133 267 667 74 48 97 243
28 129 257 643 76 47 95 237
29 124 248 621 78 46 92 231
30 120 240 600 80 45 90 225
31 116 232 581 82 44 88 220
32 113 225 563 84 43 86 214
33 109 218 545 86 42 84 209
34 106 212 529 88 41 82 205
35 103 206 514 90 40 80 200
36 100 200 500 92 39 78 196
37 97 195 486 94 38 76 192
38 95 189 474 96 38 75 188
39 92 185 462 98 37 74 184
40 90 180 450 100 36 72 180
41 88, 176 439 102 35 71 178
42 86 172 429 104 35 69 173
43 84 167 419 106 34 68 170
44 82 164 409 108 33 67 167
45 80 160 400 110 33 65 164
46 78 157 391 112 32 64 161
47 76 153 383 116 31 62 155
48 75 150 375 120 30 60 150
49 73 147 367