20
18-EB40D1-1A-EN
5. Table 11, p. 20 lists values for a 2 cubic foot dial.
For 1, 1/2, or 5 Cu. Ft. dials use the following
conversions:
• 1 Cu. Ft. Dial Gas Flow CFH = Chart Flow
Reading / 2
• 1/2 Cu Ft. Dial Gas Flow CFH = Chart Flow
Reading / 4
• 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.
7. Changes can be made by adjusting the manifold
pressure.
a. Attach a manifold pressure gauge to the Outlet
Pressure Tap.
b. Remove the cover screw on top of the gas valve
to access the manifold pressure adjustment
screw.
c. Turn the adjustment screw in to increase the
gas flow rate, and out to decrease the gas flow
rate using a 3/32" hex wrench or flat-head
screwdriver.
NNoottee:: For manifold pressures and orifice sizes for gas
with other BTU ratings, contact the local gas
utility. Manifold pressure should be 3.5 inches
water column (+ 0.1). Input for natural gas must
nnoott exceed the value shown on the rating plate.
Figure 6. Burner and Valve
Regulator Cover Screw
(Adj. screw beneath
this screw)
Manual
On-Off
Switch
Inlet
Pressure
Tap
Vent Post
Outlet
Pressure Tap
REF. VIEW
(GAS VALVE)
Orifice
Burner
Manifold
Gas Valve
REF. VIEW
(3 Burners)
Table 11. Gas Flow (in cfh)
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
Table 11. Gas Flow (in cfh) (continued)
Sec. Flow Sec. Flow Sec. Flow Sec. Flow
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
UUnniitt IInnssttaallllaattiioonn
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