7
Gas Supply Piping
Check the rating plate to make sure that the unit
was built for the type of gas available in the area.
The gas supply piping should be sized according
to the Applicable Plumbing Code for a maximum
draw of 140,000 BTUH. First determine the
effective length of the gas supply line by
measuring the actual length of piping, and then
adding 5 ft. for every elbow or “Tee” to the actual
length. Use the charts below to determine the pipe
diameter necessary to accommodate the BTU
demand of the unit. If there are more than one gas
drawing appliances on the line, size according to
the maximum amount of BTU demand.
The gas supply pressures must be within the
ranges of the following chart:
Natural Gas
Supply Pressure
Min. 5” WC
Max. 10.5” WC
Propane Gas
Supply Pressure
Min. 11” WC
Max. 14” WC
Insufficient gas supply pressure can cause the
Flash Water Heater to lose efficiency or not work
at all.
WARNING
:
Fire or explosion may result if the
maximum supply pressures are exceeded. The
manifold gas pressure should be at maximum 2.9”
WC for natural gas, and 3.3” WC for propane.
Always use approved connectors to connect the
unit to the gas line. Always purge the gas line of
any debris before connecting to the water heater.
WARNING
: Conversion of this unit from natural
gas to propane or propane to natural gas cannot
be done in the field. Contact your local retailer or
distributor to get the correct unit for your gas type.
Always install a manual shutoff valve on the gas
supply line in case of an emergency, or if service
or maintenance is necessary.
This appliance and its individual shut-off valve
must be isolated from the gas supply piping
system by unplugging the unit and turning off the
main gas valve during any pressure testing of the
gas supply piping system at test pressures equal
to or less than ½ PSI.
When all of the connections have been made,
check the gas line for leaks. Apply soapy water to
all gas fittings and connections, if bubbles form,
there may be a leak.
Natural Gas Supply Piping
Based on 0.60 specific gravity for natural gas at .5” WC pressure drop
DOE standard is 1100 BTU per cubic ft. of natural gas
Pipe
Size
Cubic Feet of Natural Gas
Length
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’
125’
150’
200’
¾”
363
249
200
171
152
138
127
118
111
104
93
84
72
1”
684
470
377
323
286
259
239
222
208
197
174
158
135
1 ¼”
1404
965
775
663
588
532
490
456
428
404
358
324
278
1 ½”
2103
1445
1161
993
880
798
734
683
641
605
536
486
416
2”
4050
2784
2235
1913
1696
1536
1413
1315
1234
1165
1033
936
801
Propane Supply Piping
Based on 11” WC supply pressure
Pipe
Size
kBTU of Propane
Length
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’
125’
150’
200’
¾”
567
393
315
267
237
217
196
185
173
162
146
132
112
1”
1071
732
590
504
448
409
378
346
322
307
275
252
213
1 ¼”
2205
1496
1212
1039
913
834
771
724
677
630
567
511
440
1 ½”
3307
2299
1858
1559
1417
1275
1181
1086
1023
976
866
787
675
2”
6221
4331
3465
2992
2646
2394
2205
2047
1921
1811
1606
1496
1260
Summary of Contents for T-KJr
Page 7: ...6 Wiring Diagram...
Page 24: ...23 Case Burner Gas Manifold...
Page 25: ...24 Water Way...
