Warning – Bradford White TG-199E-N User Manual
Page 27
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Check the type of gas and the gas inlet pressure before connecting the EverHot
®
water heater to the gas
supply. If the gas supply type does not match the type shown on the water heater rating plate, then DO
NOT connect the water heater. Contact your Bradford White supplier for the correct water heater.
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: 5.0 in. w.c.
L.P. Gas:
Minimum: 8.0 in. w.c.
Maximum: 10.5 in. w.c.
Maximum: 13.5 in. 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.
WARNING
DO NOT use matches, candles, flame, or other sources of ignition for this purpose.
Table 8.
Maximum Capacity of Schedule 40 Pipe in CFH for Gas Pressures of ½ psig or Less.
(feet)
(meters)
3/4
1
1 1/4
10
3.0
360
680
1,400
20
6.1
250
465
950
30
9.1
200
375
770
40
12.2
170
320
660
50
15.2
151
285
580
60
18.3
138
260
530
70
21.3
125
240
490
80
24.4
118
220
460
90
27.4
110
205
430
100
30.5
103
195
400
Length
0.5 in. W.C. Pressure Drop
Table 9.
Specific Gravity Correction Factors.
Specific
Gravity
Correction
Factor
Specific
Gravity
Correction
Factor
0.50
1.10
1.30
1.07
0.55
1.04
1.40
1.04
0.60
1.00
1.50
1.00
0.65
0.96
1.60
0.97
0.70
0.93
1.70
0.94
0.75
0.90
0.80
0.87
Note:
After determining the length of pipe required, select the pipe size that will supply the CFH (cubic
feet per hour) of gas required for the input rating of the gas appliances on the line. To determine
the CFH required for the gas appliances on the line, use the formula, shown below. The heating
value of the gas used may be obtained from a local gas utility.
ft)
(Btu/Cu.
Gas
of
Value
Heating
(Btu/hr)
Line
on the
s)
Appliance(
of
Input
Gas
CFH