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 96% 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 1746 1164 873 699 582 499 436 388 349 318 291 269 250
88 492 Litres LPH 6610 4406 3304 2644 2203 1888 1652 1469 1322 1201 1102 1017 945
300,000 130 US Gals. GPH 1746 1164 873 699 582 499 436 388 349 318 291 269 250
88 492 Litres LPH 6610 4406 3304 2644 2203 1888 1652 1469 1322 1201 1102 1017 945
399,900 130 US Gals. GPH 2328 1552 1164 931 776 665 582 517 466 423 388 359 332
117 492 Litres LPH 8813 5875 4406 3525 2938 2518 2203 1958 1763 1602 1469 1356 1259
399,900 130 US Gals. GPH 2328 1552 1164 931 776 665 582 517 466 423 388 359 332
117 492 Litres LPH 8813 5875 4406 3525 2938 2518 2203 1958 1763 1602 1469 1356 1259
TABLE 1 RECOVERY CAPACITIES.
NATURAL
NATURAL
PROPANE
BTH-300
BTH-300
BTH-400
BTH-400 PROPANE