22
18-CE18D1-1A-EN
Combustion and Input Check
1. Make sure all gas appliances are off except the furnace.
2. Clock the gas meter with the furnace operating (determine the
dial rating of the meter) for one revolution.
3. Match the "Sec" column in the gas flow table with the time
clocked.
4. Read the "Flow" column opposite the number of seconds clocked.
5. Use the following factors if necessary:
a. For 1 Cu. Ft. Dial Gas Flow CFH = Chart Flow Reading ÷ 2
b. For 1/2 Cu Ft. Dial Gas Flow CFH = Chart Flow Reading ÷ 4
c. For 5 Cu. Ft. Dial Gas Flow CFH = 10X Chart Flow Reading ÷ 4
6. Multiply the final figure by the heating value of the gas obtained
from the utility company and compare to the nameplate rating.
This must not exceed the nameplate rating.
Gas Flow in Cubic Feet Per Hour
2 Cubic Foot Dial
Sec. Flow Sec. Flow Sec. Flow Sec. Flow
10 732 31 236 52 141 86 85
11 666 32 229 53 138 88 83
12 610 33 222 54 136 90 81
13 563 34 215 55 133 94 78
14 523 35 209 56 131 98 75
15 488 36 203 57 128 100 73
16 458 37 198 58 126 104 70
17 431 38 193 59 124 108 68
18 407 39 188 60 122 112 65
19 385 40 183 62 118 116 63
20 366 41 179 64 114 120 61
21 349 42 174 66 111 130 56
22 333 43 170 68 108 140 52
23 318 44 166 70 105 150 49
24 305 45 163 72 102 160 46
25 293 46 159 74 99 170 43
26 282 47 156 76 96 180 41
27 271 48 153 78 94 190 39
28 262 49 149 80 92 200 37
29 253 50 146 82 89
30 244 51 144 84 87
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