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Use and Care Manual

ManualsBrandsAmerican Standard ManualsPlumbing10.0 GPM Residential Ultra Low Knox High Efficiency Condensing Natural Gas Tankless Water Heater with 180,000 BTU input
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TANKLESS WATER HEATER
PART 7
Gas Piping
To avoid serious injury or death, the gas line installation and the gas line inlet pressure test must be
done by a licensed professional. Always match the water heater with the type of gas supplied to the
unit (natural gas or LP gas). This water heater must be converted into propane operation unless
specifically manufactured for use with propane. Follow Gas Conversion Manual instructions (separate
document). Propane ready water heaters have the suffix “LP” after the model serial number.
Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in
poor performance and hazardous operating conditions.
This water heater must be converted into propane operation unless it is specifically manufactured to
operate on propane. Propane- ready water heaters have the suffix “LP” after the model serial number.
Failure to ensure the water heater is set to operate on the provided gas supply could result in property
damage, personal injury, or death.
A. GAS PIPE SIZING TABLES
1. Gas Pipe Sizing
This information is for reference use only. Refer to gas pipe manufacturer specifications for actual delivery
capacity. The DOE standard for Natural Gas is 1100 BTU/ft3. Contact the local gas supplier for actual BTU/ft3
rating.
2. Natural Gas Pipe Sizing
The following tables list maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 14” or
less and a pressure drop of 0.5 inches water column, based on a 0.60 specific gravity for natural gas.
Table 11 – Natural Gas Delivery Capacity – Corrugated Stainless Steel Pipe – Refer to ANSI Z223.1 – Na-
tional Fuel Gas Code, Latest Edition.
Maximum Natural Gas Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet
Pipe
Size
Cubic Feet per Hour (0.60 Specic Gravity, 0.5 WC Pressure Drop)
10 20 30 40 50 60 80 100 150 200
1/2”
82 58 47 41 37 37 29 26 20 18
3/4”
192 137 112 97 87 80 69 62 48 44
1” 383 269 218 188 168 153 132 118 91 82
1
1/4”
639 456 374 325 292 267 232 208 171 148
1
1/2”
1260 888 723 625 559 509 440 393 320 277
2” 2930 2080 1700 1470 1320 1200 1200 933 762 661
32
WARNING
FIRE AND/OR EXPLOSION HAZARD