Rinnai SENSEI RU199i Manual De Instalación Y Operación página 49

Natural Gas
Pressure Drop 3.0 in. w.c.
Intended use: Initial supply pressure
of 8.0 in. w.c. or greater.
Information in table obtained from
NFPA 54, ANSI Z223.1 - 2015.
Length in ft (meters)
10 (3)
20 (6)
30 (9)
40 (12)
50 (15)
60 (18)
70 (21)
80 (24)
90 (27)
100 (30)
Propane (Undiluted)
Pressure Drop 0.5 in. w.c.
Information in table obtained from
NFPA 54, ANSI Z223.1 - 2015.
Length in ft (meters)
10 (3)
20 (6)
30 (9)
40 (12)
50 (15)
60 (18)
80 (24)
100 (30)
Rinnai Tankless Water Heater Installation and Operation Manual
Schedule 40 Metallic Pipe
Inlet Pressure:
Specific Gravity: 0.6
Nominal Pipe Size (in.)
1/2 3/4
Capacity in Cubic Feet of Gas per Hour
454 949
312 652
250 524
214 448
190 397
172 360
158 331
147 308
138 289
131 273
Schedule 40 Metallic Pipe
Inlet Pressure:
Specific Gravity: 1.50
Nominal Inside Pipe Size (in.)
1/2 3/4
Capacity in Thousands of Btu per Hour
291 608
200 418
160 336
137 287
122 255
110 231
101 212
94 197
Less than 2 psi
1 1 1/4
1,790 3,670
1,230 2,520
986 2,030
844 1,730
748 1,540
678 1,390
624 1,280
580 1,190
544 1,120
514 1,060
11 in. w.c.
1 1 1/4
1,150 2,350
787 1,620
632 1,300
541 1,110
480 985
434 892
400 821
372 763
EXAMPLE
Rinnai Model Gas Input:
199,000
A
Additional Appliance total Gas Input:
65,000
B
Heating Value of Gas:
1,000
C
Cubic Feet Per Hour (CFH):
A +
(CFH) =
199,000+65,000
(CFH) =
1000
ANSWER:
= 264
CFH
For this example, the pipe diameter
must be at least 1/2 in. nominal
pipe size and 20 ft (6 m) in length.
EXAMPLE
Rinnai Model Gas Input:
199,000
A
Additional Appliance Total Gas Input:
65,000
B
Total Gas Input:
Total
Gas = A +
Input
Total
199,000+65,000
Gas =
Input
ANSWER:
Total Gas
264,000
=
Input
For this example, the pipe diameter
must be at least 1/2 in. nominal
pipe size and 10 ft (3 m) in length.
Btu/hr
Btu/hr
3
Btu/ft
B
C
3
ft /hr
Btu/hr
Btu/hr
B
Btu/hr
49