Bradford White EVERHOT IGI-180C Series Installation And Operating Instruction Manual page 30

GAS METER SIZE –NATURAL GAS ONLY
Be sure that the gas meter has sufficient capacity to supply the full rated gas input of the water heater as
well as the requirements of all other gas fired equipment supplied by the meter. If the gas meter is too
small, ask the gas company to install a larger meter having adequate capacity.
GAS PRESSURE REGULATION
Minimum and maximum gas supply pressures are listed below: The minimum gas pressure specified
below is required for the full input rating specified on the water heater rating plate.
Natural Gas: Minimum: 6.0" w.c.
Maximum: 10.5" w.c.
BEFORE PLACING THE WATER HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. USE SOAP
AND WATER SOLUTION OR OTHER MATERIAL ACCEPTABLE FOR THE PURPOSE OF LOCATING
GAS LEAKS.
DO NOT use matches, candles, flame or other sources of ignition for this purpose.
(Table assumes 0.3 inch pressure drop, specific gravity of 0.60 for gas pressures of 0.5 psi or less)
Pipe
Size in
10 20
Inches
(3) (6)
¾" 278 190
1" 520 350
1 ¼" 1050 730
1 ½" 1600 1100
Note: After determining the length of pipe required, select the pipe size that will supply the cubic feet per
hour of gas required for the input rating of the gas appliances on the line.
The formula for figuring the cubic feet per hour required is:
The heating value may be obtained from the local natural gas utility
Capacity Table for LP Gas in MBH of undiluted liquefied petroleum gases
(Table assumes 11 inches of water column pressure at the inlet, 0.5" press. drop)
Pipe
Size in
10 20
Inches
(3) (6)
½" 275 189
¾" 567 393
1 " 1071 732
1 1/4" 2205 1496
INITIAL OPERATION AND TESTING (INSTALLER ONLY)
1. Open the gas and water supply valves to the water heater.
2. Check for water and gas leaks. Use soap solution to check for gas leaks.
3. To check inlet supply pressure, remove the 1/8" NPT plug on the gas inlet supply fitting just below
the bottom casing and install a barb fitting for attaching a hose to a manometer. For checking the
gas manifold pressure, the plug is located just below the gas manifold connection inside the
control panel.
WARNING
Capacity Table for Natural Gas in Cubic Feet/Hour
Length of Pipe in Feet (Meters)
30 40 50 60
(9) (12) (15) (18)
152 130 115 105
285 245 215 195
590 500 440 400
890 760 670 610
CFH = Gas Input of Appliance on the Line (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
Length of Pipe in Feet (Meters)
30 40 50
(9) (12) (15)
152 129
315 267 237
590 504 448
1212 1039 913
L.P. Gas: Minimum: 10.0" w.c.
Maximum: 13.5" w.c.
70 80 90 100
(21) (24) (27) (30)
96 90 84 79
180 170 160 150
370 350 320 305
560 530 490 460
60 70 80
(18) (21) (24)
217 196 185
409 378 346
834 771 724
30
125 150 175
(38) (45) (53)
72 64 59
130 120 110
275 250 225
410 380 350
90 100 125 150
(27) (30) (38) (45)
173 162 146
322 307 275 252
677 630 567 511
200
(61)
55
100
210
320