Whirlpool T-K2 - Manual (Page 10)

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 185,000 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
“T” 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 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 2.3” WC for natural gas, and 2.5”
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’
½” 174 119 96 82 73 66 61 56 53 50 44 40 34
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’
½” 275 189 152 129 114 103 96 89 83 78 69 63 55
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