Takagi T-KJr2-IN Installation Manual And Owner's Manual page 18

Maximum Delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe Carrying Natural Gas of 0.60 Specific Gravity
Based on Pressure Drop of 0.5" WC
Based on Energy Content of 1,000 BTU/Cubic Ft.: The water heater requires 140 Cubic Ft./hr for the 110 (T-KJr2)
models, 190 Cubic Ft./hr for the 310 (T-K4) models, and 199 Cubic Ft./hr for the 510 (T-D2) models.
Pipe Size
Diameter 10'
¾" 363
1" 684
1 ¼" 1,404
1 ½"
2,103 1,445 1,161
2" 4,050 2,784 2,235 1,913 1,696 1,536 1,413 1,315 1,234 1,165 1,033
Maximum Capacity of Propane (LP) Based on 11" WC supply pressure at a 0.5" WC pressure drop
Pipe Size
Diameter 10'
¾" 567 393
1" 1,071 732
1 ¼" 2,205 1,496 1,212 1,039
1 ½" 3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023
2" 6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
For more information, please see the below.
Gas Sizing Example
Water
Heater
199,000BTU
10' Length
5' Length
3/4" Pipe Size
1-1/4" Pipe Size A
10' Length
5' Length
1" Pipe Size
1-1/4" Pipe Size
Gas Meter
-Natural Gas Supply Piping-
20' 30' 40'
249 200 171
470 377 323
965 775 663
993
-Propane (LP) Supply Piping-
20' 30' 40'
315 267
590 504
(Natural Gas)
Dryer
35,000BTU
15' Length
B
1" Pipe Size
10' Length
3/4" Pipe Size C
Range
Furnace
65,000BTU
120,000BTU
Length
50' 60' 70'
152 138 127
286 259 239
588 532 490
880 798 734
Length
50' 60' 70'
237 217 196
448 409 378
913 834 771
Based on Energy Content of 1,000BTU/Cubic Ft:
Divide each appliance's BTU requirement by 1,000BTU to get
the appliances Cubic Ft. requirement.
Take into account the distance the appliance is from the gas
meter, look in the above gas chart to properly size the line.
For sections of the gas line supplying gas to more than one
appliance (Ex: Point A to Point B), add up the cubic ft.
10' Length
requirements of the appliances that are being supplied by that
1/2" Pipe Size
section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the
15' Length
furnace, range, and dryer. Adding up the BTU requirements
and dividing by 1,000 yields a cubic ft. requirement of 220
1/2" Pipe Size
cubic ft. of gas. The farthest appliance is the range, which is 50
ft. away from the meter. Looking at the above chart, and
under the column of 50ft., Section A to B needs to be 1" in
order to supply 220 cubic ft.
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Page
Installation
Unit: Cubic Feet per Hour
80' 90' 100'
118 111 104
222 208 197
456 428 404
683 641 605
80' 90' 100' 125'
185 173 162
346 322 307
724 677 630
976
125' 150' 200'
93 84 72
174 158 135
358 324 278
536 486 416
936 801
Unit: kBTU per Hour
150' 200'
146 132 112
275 252 213
567 511 440
866 787 675
1,260