Rough-In Dimensions; Foreword - A.O. Smith BTH 120-250(A) Installation & Operating Instructions Manual

GAS VALVE PIPING
BTH-120 1/2" NPT
BTH-150,
199 & 250 3/4" NPT
Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P.
Input
Model BTU/Hr.
BTH - 120 125,000 Nat.
BTH - 120 120,000 L.P.
BTH - 150 150,000 Nat.
BTH - 150 150,000 L.P.
BTH - 199 199,900 Nat.
BTH - 199 185,000 L.P.
BTH - 250 240,000 Nat.
Input
Model kW Capacity
BTH - 120 37 Nat.
BTH - 120 35 L.P.
BTH - 150 44 Nat.
BTH - 150 44 L.P.
BTH - 199 58 Nat.
BTH - 199 54 L.P.
BTH - 250 70 Nat.
Recovery capacities are based on heater performance at 94% thermal efficiency.
These designs comply with the latest version of the American National
Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 / CSA 4.3 M 98
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.
CYCLONE XHE BTH 120 - 250 ROUGH-IN-DIMENSIONS
Approx.
Gallon
Capacity 30 40
60 475 356
60 456 342
100 570 427
100 570 427
100 759 569
100 703 527
100 912 684
Approx.
Liter
17°C 22°C
227 1798 1348
227 1726 1295
379 2158 1616
379 2158 1616
379 2873 2154
379 2661 1995
379 3452 2589
TEMPERATURE RISE - DEGREES °F - GALLONS PER HOUR
50 60 70 80
285 237 203 178
274 228 195 171
342 285 244 214
342 285 244 214
456 380 325 285
422 351 301 263
547 456 391 342
TEMPERATURE RISE - DEGREES °C - LITERS PER HOUR
28°C 33°C 39°C 44°C
1079 898 768 674
1037 863 738 647
1295 1079 924 810
1295 1079 924 810
1726 1438 1230 1079
1597 1329 1139 996
2071 1726 1480 1295

FOREWORD

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 latest
editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the
National Electric Code, NFPA 70 CAN/CSA 149.1 or .2 and CSA 2C22.1. The
former is available from the CSA International, 8501 East Pleasant Valley
Road, Cleveland, OH 44131, and both documents are available from the
National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.
2
90 100 110 120
158 142 129 119
152 137 124 114
190 171 155 142
190 171 155 142
253 228 207 190
234 211 192 176
304 274 248 228
50°C 56°C 61°C 67°C
598 538 488 450
575 519 469 432
719 647 587 538
719 647 587 538
958 863 784 719
886 799 727 666
1151 1037 939 863
130 140
110 102
105 98
132 122
132 122
175 163
162 151
210 195
72°C 78°C
416 386
397 371
500 462
500 462
662 617
613 572
795 738