Rinnai M060C Installation And Operation Manual page 47

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) Capacity in Cubic Feet of Gas per Hour
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 M-Series Condensing Boiler Combi Manual
Schedule 40 Metallic Pipe
Inlet Pressure: Less than 2 psi
Specific Gravity: 0.6
Nominal Pipe Size (in.)
1/2 3/4 1
454 949 1,790
312 652 1,230
250 524 986
214 448 844
190 397 748
172 360 678
158 331 624
147 308 580
138 289 544
131 273 514
Schedule 40 Metallic Pipe
Inlet Pressure: 11 in. w.c.
Specific Gravity: 1.50
Nominal Inside Pipe Size (in.)
1/2 3/4 1
Capacity in Thousands of Btu/hr
291 608 1,150
200 418 787
160 336 632
137 287 541
122 255 480
110 231 434
101 212 400
94 197 372
Rinnai Model Gas Input:
160,000
A
Additional Appliance total Gas Input:
65,000
B
Heating Value of Gas:
1 1/4
C
3,670
Cubic Feet Per Hour (CFH):
2,520
(CFH) =
2,030
1,730
(CFH) =
1,540
1,390
ANSWER:
1,280
=
CFH
1,190
1,120
For this example, the pipe diameter
must be at least 1/2 in. nominal
1,060
pipe size and 20 ft (6 m) in length.
Rinnai Model Gas Input:
160,000
A
Additional Appliance Total Gas Input:
65,000
B
Total Gas Input:
1 1/4
Total
Gas =
2,350 Input
1,620
Total
Gas
=
1,300
Input
1,110
ANSWER:
985
Total Gas
892
=
Input
821
For this example, the pipe diameter
763
must be at least 1/2 in. nominal
pipe size and 10 ft (3 m) in length.
EXAMPLE
BTU/HR
BTU/HR
1,000 3
BTU/FT
A + B
C
160,000+65,000
1000
225 3
FT /HR
EXAMPLE
BTU/HR
BTU/HR
A + B
160,000+65,000
225,000
BTU/HR
47