A.O. Smith BTH 300A - Manual (Page 2)

2
These designs comply with the current edition of the American
National Standard for Gas Water Heaters, Volume III,
ANSI Z21.10.3 / CSA 4.3 as an automatic circulating tank water
heater, and automatic storage water heaters.
Detailed installation diagrams are found in this manual. These
diagrams will serve to provide the installer with a reference for the
materials and methods of piping necessary. It is highly essential
that all water, gas piping and wiring be installed as shown on the
diagrams.
Particular attention should be given to the installation of
thermometers at the locations indicated on the diagrams as these
are necessary for checking the proper functioning of the heater.
In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations in force in the
local area where the installation is to be made. These shall be
carefully followed in all cases. Authorities having jurisdiction should
be consulted before installations are made.
In the absence of local codes, the installation must comply
with the current editions of the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and the National Electrical Code,
NFPA 70 or CAN/CSA-B149.1, the Natural Gas and Propane
Installation Code and CSA C22.1, the Canadian Electrical Code.
All documents are available from the Canadian Standards
Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131.
NFPA documents are also available from the National Fire
Protection Association, 1 Batterymarch Park, Quincy, MA 02269.
FOREWORD
ROUGH-IN-DIMENSIONS
GAS VALVE PIPING
BTH-300 1 1/4" NPT
BTH-400 1 1/4" NPT
Recovery capacities are based on heater performance at 98% thermal efficiency.
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
TYPE OF INPUT Approx. F° 20F° 30F° 40F° 50F° 60F° 70F° 80F° 90F° 100F° 110° 120F° 130F° 140F°
MODEL GAS BTUH KW Capacity C° 11C° 17C° 22C° 28C° 33C° 39C° 44C° 50C° 56C° 61C° 67C° 72C° 78C°
300,000 130 US Gals. GPH 1782 1188 891 713 594 509 445 396 356 324 297 274 255
88 492 Litres LPH 6745 4496 3372 2698 2248 1927 1686 1499 1349 1226 1124 1038 964
280,000 130 US Gals. GPH 1663 1109 832 665 554 475 416 370 333 302 277 256 238
82 492 Litres LPH 6295 4197 3148 2518 2098 1799 1574 1399 1259 1145 1049 968 899
400,000 130 US Gals. GPH 2376 1584 1188 950 792 679 594 528 475 432 396 366 339
117 492 Litres LPH 8993 5995 4496 3597 2998 2569 2248 1998 1799 1635 1499 1384 1285
400,000 130 US Gals. GPH 2376 1584 1188 950 792 679 594 528 475 432 396 366 339
117 492 Litres LPH 8993 5995 4496 3597 2998 2569 2248 1998 1799 1635 1499 1384 1285
TABLE 1 RECOVERY CAPACITIES.
NATURAL
NATURAL
PROPANE
BTH-300
BTH-300
BTH-400
BTH-400 PROPANE