A.O. Smith BTH 300A Manuale Utente
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.
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.
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.
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 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.
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