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Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual page 34

Indoor residential tankless water heaters, 160 000/199 000 btu- natural gas 160 000/199 000 btu - liquefied petroleum lp gas
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Installation instructions
GAS LINE SIZING
The gas supply piping for a single heater should be sized for a maximum draw of 199000 BTU/hr for Greentherm T9900 SE/i.
Measure the length of the gas supply line from the building's gas main to the heater and use the chapter 4.8.1 and 4.8.2 or the gas
line manufacturer's sizing tables to determine the pipe diameter necessary. If there are more gas appliances on the line, size the gas
line according to the total maximum amount of BTU draw input rating of for all appliances combined.
Note: Undersizing the gas line may result in diminished hot water flow rate and temperature, or improper appliance operation (noise
and combustion instabilities). See chapter 4.13, page 43 for the procedure to measure gas pressure. Proper gas pressure must be
confirmed at time of installation.
4.8.1 Gas Line Sizing Tables for NATURAL GAS
For your convenience, see below an excerpt from gas line sizing tables for a single NG appliance. For details, see the current NFPA
54.
Required input for 160000 / 199000 BTU/hr for the Greentherm T9900 SE/i. 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 cubic feet per hour. Please contact your local gas supplier for
the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/cubic foot for rough estimations.
Nominal
Internal
Iron Pipe
Diameter
Size, inches
inches
¾
0.824
1
1.049
Table 11 Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a
pressure drop of 0.5" W.C. (1.25 mbar) based on 0.60 specific gravity gas).
Initial Supply Pressure of 8.0" w.c. or Greater
Nominal
Internal
Iron Pipe
Diameter
Size, inches
inches
½
0.622
¾
0.824
1
1.049
Table 12 Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a
pressure drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas.
Length of Corrugated Stainless Steel Tubing (CSST), Feet
EHD*
10
20
30
330
231
31
383
269
37
639
456
Table 13 Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a
pressure drop of 0.5" W.C. (1.25 mbar) based on 0.60 specific gravity gas).
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
34
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
360
247
199
678
466
374
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
454
312
250
949
652
524
1790
1230
986
30
40
188
162
218
188
374
325
40
50
60
170
151
137
320
284
257
40
50
60
214
190
172
448
397
360
844
748
678
50
60
70
144
131
121
168
153
141
292
267
248
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
70
80
90
126
117
110
237
220
207
70
80
90
158
147
138
331
308
289
624
580
544
80
90
113
107
132
125
232
219
100
104
195
100
131
273
514
100
101
118
208

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