34 18-CD26D1-10
Installer’s Guide
Table 18
GAS FLOW IN CUBIC FEET PER HOUR
2 CUBIC FOOT DIAL
SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW
8 900 29 248 50 144 82 88
9 800 30 240 51 141 84 86
10 720 31 232 52 138 86 84
11 655 32 225 53 136 88 82
12 600 33 218 54 133 90 80
13 555 34 212 55 131 92 78
14 514 35 206 56 129 94 76
15 480 36 200 57 126 96 75
16 450 37 195 58 124 98 73
17 424 38 189 59 122 100 72
18 400 39 185 60 120 104 69
19 379 40 180 62 116 108 67
20 360 41 176 64 112 112 64
21 343 42 172 66 109 116 62
22 327 43 167 68 106 120 60
23 313 44 164 70 103 124 58
24 300 45 160 72 100 128 56
25 288 46 157 74 97 132 54
26 277 47 153 76 95 136 53
27 267 48 150 78 92 140 51
28 257 49 147 80 90 144 50
REINSTALLATION OF THE BURNER BOX COVER
Figure 59 shows the correct way to reinstall the burner box
cover if adjustment or replacement of the flame sensor, hot
surface igniter, or main burner orifices have required removal
of the cover.
Figure 59
NOTE: The manifold pressure must be referenced to the
burner box. The burner box pressure tap equalizes the gas
valve pressure regulator. Manifold pressure is checked by
installing a tee (field supplied) in the tubing, between the tee
coming from the burner box tube and the gas valve,
in
addition to the regular gas valve pressure tap on the outlet
side of the gas valve. See Figure 59.
Table 21 lists the main burner orifices used with the furnace.
If a change of orifices is required to correct the furnace input
rating refer to Table 19.
WARNING
!
HAZARD OF EXPLOSION
REPLACE AND/ OR
TIGHTEN ALL PLUGS
REMOVED OR LOOS-
ENED WHEN ADJUST-
ING GAS PRESSURE.
LEAK CHECK THE
FITTINGS BEFORE
PLACING THE FURNACE
INTO REGULAR SER-
VICE.
FAILURE TO FOLLOW
THIS WARNING COULD
RESULT IN FIRE, EXPLO-
SION, PROPERTY
DAMAGE, OR DEATH.
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