Water Connections - Bradford White RTG 199 MEN Installation And Operation Instructions Manual

4.9.2 Gas Line Sizing Tables for LP GAS
For your convenience see below for an excerpt from gas line sizing tables for a single LP appliance. Their intended use of is for pipe sizing between the
2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Specified pipe lengths are for one RTG 199ME which has a maximum input of 199,000. The gas supply system must be sized for the combined total
maximum BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in thousands of BTU per hour of Undiluted LP Gas at 11" W.C (0.4 psig or 27.4
mbar) based on a pressure drop of 0.5" W.C (1.25 mbar).
Internal
Nominal Iron Diameter
Pipe inches inches
1/2 0.622
3/4 0.824
1 1.049
Table 28
Tube size,
inches EHD*
3/4 23
3/4 23
1 30
1 31
Table 29
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
Nominal Iron Internal Diameter
Pipe inches inches
5/8 0.527
3/4 0.652
Table 30
Maximum Capacity of Semi-Rigid (flexible, non corrugated) Tubing in
Thousands of BTU/hr of Undiluted Liquefied Petroleum Gases (at 11
inches Water Column Inlet Pressure).(Based on a Pressure Drop of 0.5
4.10

Water connections

NOTICE:
▶ This heater is not approved for preheated water
applications exceeding 140°F (60°C).
NOTICE:
▶ In applications where inlet water temperature can
exceed 140°F (60°C), a 3-way valve or mixing valve
must be installed before the appliance to prevent
water exceeding 140°F (60°C) from entering the
appliance.
▶ When facing the heater, the ¾ " cold connection is on the bottom
right and the hot connection is on the bottom left. Centrally locating
the water heater is recommended to keep hot water distribution
times even throughout the structure.
RTG 199 ME – 6 720 811 615 (2015/04)
10 20
291 200
608 418
1150 787
Length of Corrugated Stainless Steel Tubing (CSST), Feet
10 20 30
254 183 151
303 216 177
521 365 297
605 425 344
10
188
329
Length of Black iron Pipe, Feet
30 40 50
160 137 122
336 287 255
632 541 480
40 50 60
131 118 107
153 137 126
256 227 207
297 265 241
Length of Semirigid (soft) Copper ACR Tubing, Feet
20 30
129 104
226 182
Inch Water Column)* Source National Fuel Gas Code NFPA 54, ANSI
Z223.1 - No Additional Allowance is necessary for an ordinary number of
fittings.
Fig. 34
[1] Cold connection
[2] Hot connection
Installation instructions
60 80
110 101
231 212
434 400
70 80 90
99 94 90
117 109 102
191 178 169
222 208 197
40
89
155
100
94
197
372
100
85
98
159
186
50
79
138
29