A. O. Smith BTRC-154 Installation Manual
MODELS BTR(C)120 THRU 400A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our product.
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
500 T ennessee Waltz Parkway , Ashland City , TN 37015
Phone: 800-527-1953 Fax: 800-433-2515
www.hotwater.com
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED IN U.S.A. 0706 PART NO. 197283-000
1
ROUGH-IN-DIMENSIONS
BTR MODELS 120 THROUGH 400A - TABLE 1A
MODELS BTR(C) 120 THROUGH 500
See Models Below
FIGURE 1
MODEL INPUT APPROX. GAS H VENT CONNECTIONS Approximate
BTR120 120,000 BTU/Hr. 71 Gal 69.75" 4.25" 59.50" 50.87" 19.69" 19" 1/2" 51.88" 5" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 400 Lbs NA
BTR154 154,000 BTU/Hr 81 Gal 73.00" 4.25" 66.50" 57.87" 19.69" 19" 1/2" 59.00" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 Lbs NA
BTR180 180,000 BTU/Hr 81Gal 67.50" 4.50" 62.00" 53.62" 20.50" 21" 1/2" 54.62" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 Lbs NA
BTR197 199,000 BTR/Hr 100 Gal 75.00" 4.50" 70.00" 61.62" 20.50" 21" 1/2" 62.62" 6 " 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 603 Lbs NA
BTR198 199,000 BTU/Hr. 100 Gal 75.00" 4.50" 70.00" 61.62" 20.50" 21" 1/2" 61.50" 6" 27.75" 1.50" 1.50" 2.00" 1.50" 1.50" 2.00" 603 Lbs NA
BTR199 199,000 BTU/Hr 81 Gal 67.50" 4.50" 62.00" 53.62" 20.50" 21" 1/2" 54.62" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 Lbs NA
BTR 200 199,000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 6" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 Lbs 725 Lbs
BTR 250 250,000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 Lbs 725 Lbs
BTR 251 251,000 BTR/Hr 65 Gal 75.00" 4.50" 65.75" 57.25" 20.00" NA 1/2" 58.75 8" 27.75" NA 1.50" 1.50" NA 1.50" 1.50" 750Lbs 862 Lbs
BTR 275 275,000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 Lbs 725 Lbs
BTR 305 305,000 BTR/Hr 65 Gal 75.00" 4.50" 65.75" 57.25" 20.00" NA 1/2" 58.75 8" 27.75" NA 1.50" 1.50" NA 1.50" 1.50" 750 Lbs 862 Lbs
BTR 365 365,000 BTR/Hr 85 Gal 79.50" 4.50" 70.25" 62.50" 22.50" 23” 3/4" 63.00 8" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 725 Lbs 833 Lbs
BTR 400 390,000 BTU/Hr 100 Gal 75.50" 4.50" 67.50" 58.25" 26.75" 23" 3/4" 59.00" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 760 Lbs 874 Lbs
RATE TANK INLET DIA INLET OUTLET ship. Weight
BTU/Hr. CAP. A B C D E F G I J TOP FRONT BACK TOP FRONT BACK STD. ASME
35 Kw/Hr 268 L 177 cm 11 cm 151 cm 129 cm 50 cm 48 cm 1/2" 132 cm 13 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 182 Kg NA
45 Kw/Hr 307 L 185 cm 11 cm 169 cm 147 cm 50 cm 48 cm 1/2" 150 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
53 Kw/Hr 307 L 171 cm 12 cm 157 cm 136 cm 52 cm 53 cm 1/2" 139 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
58 kW/Hr 379 L 192 cm 12 cm 178 cm 157 cm 52 cm 53 cm 1/2" 159 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 273 Kg NA
58 Kw/Hr 379 L 192 cm 12 cm 178 cm 157 cm 52 cm 53 cm 1/2" 150 cm 15 cm 71 cm 1.50" 1.50" 2.00" 1.50" 1.50" 2.00" 273 Kg NA
58 kW/Hr 307 L 171 cm 12 cm 157 cm 136 cm 52 cm 53 cm 1/2" 139 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
58 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 15 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
72 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
73 kW/Hr 246 L 191 cm 12 cm 167 cm 145 cm 51 cm NA 1/2" 149 cm 20 cm 70 cm NA 1.50" 1.50" NA 1.50" 1.50" 341 Kg 391 Kg
80 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
89 kW/Hr 246 L 191 cm 12 cm 167 cm 145 cm 51 cm NA 1/2" 149 cm 20 cm 70 cm NA 1.50" 1.50" NA 1.50" 1.50" 341 Kg 391 Kg
107 kW/Hr 322 L 202 cm 12 cm 178 cm 159 cm 57 cm 58 cm 3/4" 160 cm 20 cm 70 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 329 Kg 379 Kg
114 kW/Hr 379 L 192 cm 12 cm 171 cm 148 cm 68 cm 58 cm 3/4" 150 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 345 Kg 396 Kg
BTRC MODELS 120 THROUGH 400/A - TABLE 1B
MODEL INPUT APPROX. GAS H VENT CONNECTIONS Approximate
BTRC120 120,000 BTU/Hr. 71 Gal 69.75" 4.25" 59.50" 50.87" 19.69" 19" 1/2" 51.88" 5" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 400 LBS N A
BTRC154 154,000 BTU/Hr 81 Gal 73.00" 4.25" 66.50" 57.87" 19.69" 19" 1/2" 59.00" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 LBS NA
BTRC180 180,000 BTU/Hr 76 Gal 70.50" 4.25" 63.75" 55.13" 17.75" 19" 1/2" 56.50" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 LBS NA
BTRC197 199,000 BTR/Hr 95 Gal 81.50" 4.25" 74.75" 66.13" 17.75" 19" 1/2" 67.50" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 603 LBS NA
BTRC199 199,000 BTU/Hr 76 Gal 70.50" 4.25" 63.75" 55.13" 17.75" 19" 1/2" 56.50" 6" 27.75" 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 470 LBS NA
BTRC200 199,000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 6" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 lbs 725 lbs
BTRC250 250000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 lbs 725 lbs
BTRC251 251000 BTR/Hr 65 Gal 75.00" 4.50" 65.75" 57.25" 20.00" NA 1/2" 58.8 8" 27.75" NA 1.50" 1.50" NA 1.50" 1.50" 750 lbs 862 lbs
BTRC275 275,000 BTR/Hr 100 Gal 72.00" 4.50" 65.13" 55.87" 19.75" 23" 1/2" 56.38" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 630 lbs 725 lbs
BTRC305 305,000 BTR/Hr 65 Gal 75.00" 4.50" 65.75" 57.25" 20.00" NA 1/2" 58.8 8" 27.75" NA 1.50" 1.50" NA 1.50" 1.50" 750 lbs 862 lbs
BTRC365 365,000 BTR/Hr 65 Gal 75.00" 4.50" 65.75" 57.25" 20.00" NA 3/4" 58.8 8" 27.75" NA 1.50" 1.50" NA 1.50" 1.50" 750 lbs 862 lbs
BTRC400 390,000 BTU/Hr 100 Gal 75.50" 4.50" 67.50" 58.25" 26.75" 23" 3/4" 59.00" 8" 30.25" 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 760 lbs 874 lbs
RATE TANK INLET DIA INLET OUTLET ship. Weight
BTU/Hr. CAP. A B C D E F G I J TOP FRONT BACK TOP FRONT BACK STD. ASME
35 Kw/Hr 268 L 177 cm 11 cm 151 cm 129 cm 50 cm 48 cm 1/2" 132 cm 13 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 182 Kg NA
45 Kw/Hr 307 L 185 cm 11 cm 169 cm 147 cm 50 cm 48 cm 1/2" 150 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
53 Kw/Hr 288 L 179 cm 11 cm 162 cm 140 cm 45 cm 48 cm 1/2" 144 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
58 kW/Hr 360 L 207 cm 11 cm 190 cm 168 cm 45 cm 48 cm 1/2" 171 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 273 Kg NA
58 kW/Hr 288 L 179 cm 11 cm 162 cm 140 cm 45 cm 48 cm 1/2" 144 cm 15 cm 71 cm 1.50" 1.50" 1.50" 1.50" 1.50" 1.50" 213 Kg NA
58 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 15 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
72 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
73 kW/Hr 246 L 191 cm 12 cm 167 cm 145 cm 51 cm NA 1/2" 149 cm 20 cm 70 cm NA 1.50" 1.50" NA 1.50" 1.50" 341 Kg 391 Kg
80 kW/Hr 379 L 183 cm 12 cm 165 cm 142 cm 50 cm 58 cm 1/2" 143 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 286 Kg 329 Kg
89 kW/Hr 246 L 191 cm 12 cm 167 cm 145 cm 51 cm NA 1/2" 149 cm 20 cm 70 cm NA 1.50" 1.50" NA 1.50" 1.50" 341 Kg 391 Kg
107 kW/Hr 246 L 191 cm 12 cm 167 cm 145 cm 51 cm NA 3/4" 149 cm 20 cm 70 cm NA 1.50" 1.50" NA 1.50" 1.50" 341 Kg 391 Kg
114 kW/Hr 379 L 192 cm 12 cm 171 cm 148 cm 68 cm 58 cm 3/4" 150 cm 20 cm 77 cm 1.50" 2.00" 2.00" 1.50" 2.00" 2.00" 345 Kg 396 Kg
2
TABLE 1C - HEATER PERFORMANCE DA TA BTR MODELS
INPUT APPROX. RECOVERY RATING CAPACITIES (GPH AND LPH)
MODEL BTUH CAP. % (-)1° C 4° C 10° C 15° C 21° C 27° C 32° C 38° C 43° C 49° C 54° C 60° C
BTR 120,000 BTUH 71 Gal 80 388 29 1 233 194 166 145 129 116 106 97 90 83
120 35 Kw/Hr 268 L 1469 1102 882 734 628 549 488 439 401 367 341 314
BTR 154,000 BTUH 81 Gal 80 498 37 3 299 249 213 187 166 149 136 124 115 107
154 45 Kw/Hr 306 L 1885 1412 1132 94 3 806 708 628 564 515 469 435 405
BTR 180,000 BTUH 81 Gal 80 579 43 4 347 289 248 217 193 174 158 145 134 124
180 53 Kw/Hr 306L 2192 1643 1314 1094 93 9 821 731 659 5 98 549 507 469
BTR 199,000 BTUH 100 Gal 80 643 4 82 386 32 2 276 241 214 193 175 161 1 48 132
197 58 Kw/Hr 379 L 2434 1825 1461 1219 1045 912 810 731 662 609 560 500
BTR 199,000 BTUH 100 Gal 80 643 4 82 386 32 2 276 241 214 193 175 161 1 48 132
198 58 Kw/Hr 379L 2434 1825 1461 1219 1045 912 810 73 1 662 609 560 500
BTR 199,000 BTUH 81 Gal 80 614 46 1 368 307 263 230 205 184 167 154 142 132
199 58 Kw/Hr 306 L 2324 1745 1393 1162 996 871 7 76 697 63 2 583 538 500
BTR 199,000 BTUH 100 Gal 80 643 4 82 386 32 2 276 241 214 193 175 161 1 48 132
200 58 Kw/Hr 379 L 2434 1825 1461 1219 1045 912 810 731 662 609 560 500
BTR 250,000 BTUH 100 Gal 80 808 6 06 485 40 4 346 303 269 242 220 202 1 86 173
250 73 Kw/Hr 379 L 3059 2294 1835 1529 1311 1147 1020 918 834 765 706 65 5
BTR 251,000 BTUH 65 Gal 80 811 60 8 487 406 348 304 270 243 221 203 18 7 174
251 73 Kw/Hr 246 L 3071 2303 1843 1536 1316 1152 1024 921 838 768 709 6 58
BTR 275,000 BTUH 100 Gal 80 889 6 67 533 44 4 381 333 296 267 242 222 2 05 190
275 80 Kw/Hr 379 L 3365 2524 2019 1682 1442 1262 1122 1009 918 841 776 721
BTR 305,000 BTUH 65 Gal 80 986 73 9 592 493 423 370 329 296 269 246 22 8 211
305 89 Kw/Hr 246 L 3732 2799 2239 1866 1599 1399 1244 1120 1018 933 86 1 800
BTR 365,000 85 Gal 80 1180 885 708 590 506 442 393 354 322 295 272 253
365 107 Kw/Hr 322 L 4466 3349 2680 2233 1914 1675 1489 1340 1218 1116 1031 957
BTR 390,000 BTUH 100 Gal 80 1293 970 776 646 554 485 431 388 353 323 29 8 277
400 114 Kw/Hr 379 L 4894 3671 2936 2447 2097 1835 1631 1468 1335 1224 1129 1049
RATE GAL EFF. 30° F 40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F
TABLE 1D - HEATER PERFORMANCE DATA BTR(C) MODELS
INPUT APPROX. RECOVERY RATING CAPACITIES (GPH AND LPH)
MODEL BTUH CAP. % (-)1° C 4° C 10° C 15° C 21° C 27° C 32° C 38° C 43° C 49° C 54° C 60° C
BTRC 120,000 BTUH 71 Gal 80 388 291 233 194 166 145 129 116 106 97 90 83
120 35 Kw/Hr 268 L 1469 1102 882 734 628 549 488 439 401 36 7 34 1 314
BTRC 154,000 BTUH 81 Gal 80 498 373 299 249 213 187 166 149 136 124 115 107
154 45 Kw/Hr 306 L 1885 1412 1132 94 3 806 708 628 564 515 46 9 43 5 405
BTRC 180,000 BTUH 76 Gal 80 579 434 347 289 248 217 193 174 158 145 134 124
180 53 Kw/Hr 288L 2192 1643 1314 1094 93 9 821 731 659 5 98 5 49 507 469
BTRC 199,000 BTUH 95 Gal 80 643 482 386 322 276 241 214 193 175 161 148 132
197 58 Kw/Hr 360 L 2434 1825 1461 1219 1045 912 810 731 662 609 560 500
BTRC 199,000 BTUH 76 Gal 80 614 461 368 307 263 230 205 184 167 154 142 132
199 58 Kw/Hr 288 L 2324 1745 1393 1162 996 871 7 76 697 63 2 58 3 5 38 500
BTRC 199,000 BTUH 100 Gal 80 64 3 482 386 322 276 241 214 193 17 5 16 1 1 48 132
200 58 Kw/Hr 379 L 2434 1825 1461 1219 1045 912 810 731 662 609 560 500
BTRC 250,000 BTUH 100 Gal 80 80 8 606 485 404 346 303 269 242 22 0 20 2 1 86 173
250 73 Kw/Hr 379 L 3059 2294 1835 1529 1311 1147 1020 918 834 765 706 65 5
BTRC 251,000 BTUH 65 Gal 80 811 608 487 406 348 304 270 243 221 203 187 174
251 73 Kw/Hr 246 L 3071 2303 1843 1536 1316 1152 1024 921 838 768 709 6 58
BTRC 275,000 BTUH 100 Gal 80 88 9 667 533 444 381 333 296 267 24 2 22 2 2 05 190
275 80 Kw/Hr 379 L 3365 2524 2019 1682 1442 1262 1122 1009 918 841 776 721
BTRC 305,000 BTUH 65 Gal 80 986 739 592 493 423 370 329 296 269 246 228 211
305 89 Kw/Hr 246 L 3732 2799 2239 1866 1599 1399 1244 1120 1018 933 86 1 800
BTRC 360,000 BTUH 65 Gal 80 1164 873 698 582 499 436 388 349 317 291 269 249
365 105 Kw/Hr 246 L 4405 3304 2643 2202 1888 1652 1468 1321 1201 1101 1016 944
BTRC 390,000 BTUH 100 Gal 80 1293 970 776 646 554 485 43 1 388 353 323 298 277
400 114 Kw/Hr 379 L 4894 3671 2936 2447 2097 1835 1631 1468 1335 1224 1129 1049
RATE GAL EFF. 30° F 40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F
3
TABLE OF CONTENTS
Page Page
ROUGH-IN-DIMENSIONS ----------------------------------------2-3
T ABLE OF CONTENTS---------------------------------------------- 4
FOREWORD ----------------------------------------------------------- 4
GENERAL SAFETY INFORMA TION ----------------------------- 5
Chemical Vapor Corrosion ------------------------------------------ 5
Improper Combustion ------------------------------------------------ 5
Liquid Petroleum Models -------------------------------------------- 5
Extended Non-Use Periods----------------------------------------- 5
Insulation Blankets--------------------------------------------------5-6
High Altitude Installation --------------------------------------------- 6
FEATURES ------------------------------------------------------------- 6
The Eliminator (Self-Cleaning System) -------------------------- 6
High Limit Switch (E.C.O.) ---------------------------------------- 6-7
Electronic Ignition Control ------------------------------------------- 7
Automatic Flue Damper Device ----------------------------------- 7
Circulating Pump ------------------------------------------------------ 7
Dishwashing Machine Requirement ---------------------------- 7-8
INSTALLA TION INSTRUCTIONS --------------------------------- 8
Uncrating ---------------------------------------------------------------- 8
Locating The Heater -------------------------------------------------- 8
Levelling ----------------------------------------------------------------- 8
Clearances ------------------------------------------------------------ 8-9
Installation on Combustible Flooring ----------------------------- 9
Hard Water -------------------------------------------------------------- 9
Air Requirements -------------------------------------------------- 9-10
Unconfined Space --------------------------------------------------- 9
Confined Space ----------------------------------------------------- 10
Vent Reducer ----------------------------------------------------------10
Venting ------------------------------------------------------------------ 10
Multiple Heater Manifold --------------------------------------------10
Water Line Connections--------------------------------------------10
Technical Data Venting------------------------------------------11-12
Water (Potable) Heating and Space Heating ----------------- 13
Thermometers (Not Supplied) ------------------------------------13
Relief Valve ------------------------------------------------------------13
Gas Piping -------------------------------------------------------- 13-14
Gas piping and Dirt Leg Installation ------------------------ 14-15
Gas Pressure Regulator -------------------------------------------- 15
Grounding Instructions----------------------------------------------15
Heater Wiring ---------------------------------------------------------- 15
INST ALLA TION DIAGRAMS---------------------------------- 15-21
MANIFOLDS ----------------------------------------------------------- 22
MECHANICAL VENTING-------------------------------------------23
Single Unit Installation ----------------------------------------------23
Vent Installation -------------------------------------------------------23
Multiple Unit Installation --------------------------------------------23
OPERATION ----------------------------------------------------------- 24
General -----------------------------------------------------------------24
Filling --------------------------------------------------------------------24
Purging------------------------------------------------------------------24
Lighting and Operating Labels ------------------------------- 25-26
Water Temperature Control----------------------------------------27
Testing Damper Control--------------------------------------------- 27
Checking Venting ------------------------------------------------ 27-28
PREVENTIVE MAINTENANCE-----------------------------------28
Check The Pilot -------------------------------------------------------28
Pilot Burner ------------------------------------------------------------ 28
Main Burner------------------------------------------------------- 28-29
Gas Valves -------------------------------------------------------------29
Checking The Input --------------------------------------------------29
Venting System ------------------------------------------------------- 3 0
Remote Storage Tank Temperature Control ------------------- 30
Relief Valve ------------------------------------------------------------ 3 0
Hot Water Odor ------------------------------------------------------- 30
Anode Rod Inspection ----------------------------------------------30
Recommended Procedure For Periodic Removal
of Lime Deposits From Tank Type Commercial
Water Heaters ---------------------------------------------------- 30-31
Deliming Solvents ---------------------------------------------------- 31
Tank Cleanout Procedures------------------------------------ 31-32
Troubleshooting Ignition Module System ---------------------- 32
SERVICE ---------------------------------------------------------------32
Electrical Servicing---------------------------------------------------32
Replacement Parts --------------------------------------------------- 32
Effikal Flue Damper Troubleshooting Guide ------------------ 33
Operational Checklist -----------------------------------------------34
Limited Warranty -----------------------------------------------------35
FOREWORD
These designs comply with ANSI Z21.10.3/CSA 4.3 as an
automatic circulating or automatic storage tank type water heater .
Heaters having an input of 305,000 (89 Kwh), 365,000 (107 Kwh),
399,000 (117 Kwh) and 500,000 (147 Kwh) Btuh with a recovery
rating of 277.3 gph (1049 Lph) or more also comply with ANSI
Z21.10.3 as an automatic instantaneous type heater.
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 inst alled 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.
This model water heater is designed and manufactured in both
natural gas and propane versions. MAKE SURE the gas on which
the heater will operate is the same as that specified on the heater
model and rating plate.
These heaters may be installed on combustible floors.
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.
The installation must conform to these instructions and the local
code authority having jurisdiction. In the absence of local codes,
the installation must comply with the latest editions of the National
Fuel Gas Code, ANSI Z223.1/NFP A 54 and the National Electrical
Code, NFP A 70 or CAN/CSA B149.1-00, and CSA 2 C22.1. The
former is available from the Canadian Standards Association, 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.
4
GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
UNDER WATER. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the control
system and any gas control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE
BEEN MADE BY A QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING
CHEMICAL VAPOR CORROSION
LIQUID PETROLEUM MODELS
Water heaters for propane or liquefied petroleum gas (LPG) are
different from natural gas models. A natural gas heater will not
function safely on LP gas and no attempt should be made to
convert a heater from natural gas to LP gas.
LP gas must be used with great caution. It is highly explosive
and heavier than air. It collects first in the low areas making its
odor difficult to detect at nose level. If LP gas is present or even
suspected, do not attempt to find the cause yourself. Go to a
neighbor's house, leaving your doors open to ventilate the house,
then call your gas supplier or service agent. Keep area clear
until a service call has been made.
At times you may not be able to smell an LP gas leak. One
cause is odor fade, which is a loss of the chemical odorant that
gives LP gas its distinctive smell. Another cause can be your
physical condition, such as having a cold or diminishing sense of
smell with age. For these reasons, the use of a propane gas
detector is recommended.
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO NOT
TRY TO RELIGHT APPLIANCES YOURSELF,
delivery person to relight pilots for you. Only trained LP
professionals should conduct the required safety checks in
accordance with industry standards.
Ask your LP
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
and sodium chloride (water softener salt), waxes, and process
chemicals are typical compounds which are potentially
corrosive. Do not store products of this sort near the heater.
Also, air which is brought in contact with a the heater should
not contain any of these chemicals. If necessary,
uncontaminated air should be obtained from remote or outside
sources. The limited warranty is voided when failure of water
heater is due to a corrosive atmosphere. (Refer to the limited
warranty for complete terms and conditions.)
IMPROPER COMBUSTION
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE
PREMISES WITH A W A TER HEATER CAN RESUL T IN CARBON
MONOXIDE POISONING AND DEA TH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THE AREA OF THE WATER HEA TER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGH THE CHIMNEY OR VENT PIPE.
The venting of the water heater should be inspected by a qualified
service technician at the time of installation and periodically
thereafter to ensure a down-draft condition does not exist.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUA TE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER
SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN
USED FOR A LONG PERIOD OF TIME (GENERALLY TWO
WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY
FLAMMABLE. T o reduce the risk of injury under these conditions,
it is recommended that the hot water faucet be opened for several
minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there
will probably be an unusual sound such as air escaping through
the pipe as the water begins to flow. THERE SHOULD BE NO
SMOKING OR OPEN FLAME NEAR THE FAUCET A T THE TIME
IT IS OPEN.
INSULA TION BLANKETS
Insulation blankets available to the general public for external
use on gas water heaters are not approved for use on your A.O.
Smith water heater. The purpose of an insulation blanket is to
reduce the standby heat loss encountered with storage tank water
heaters. Your A.O. Smith water heater meets or exceeds the
ANSI/ASHRAE/IESNA Standard 90.1 1999 with respect to
insulation and standby loss requirement making an insulation
blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions. Failure to follow these
instructions can result in fire, asphyxiation , serious personal injury
or death.
Do not apply insulation to the top of the water heater, as this
•
will interfere with safe operation of drafthood.
• Do not cover the gas valve or temperature & pressure relief
valve.
5
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
Do not allow insulation to come within 2” (5 cm) of the burners,
•
to prevent blockage of combustion air flow to the burners.
Do not allow insulation to come within 9” (23 cm) of floor, (within
•
2” (5 cm) of bottom cover) to prevent blockage of combustion
air flow to the burners.
Do inspect the insulation blanket frequently to make sure it
•
does not sag, thereby obstructing combustion air flow.
Do obtain new labels from A.O. Smith for placement on the
•
blanket directly over the existing labels.
HIGH AL TITUDE INST ALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF THE BURNER ORIFICES IN ACCORDANCE
WITH THE NATIONAL FUEL GAS CODE (ANSI Z223.1). FOR
CANADIAN INSTALLATIONS CONSULT NATURAL GAS AND
PROPANE INSTALLA TION CODE CAN/CSA-B149.1. FAILURE
TO REPLACE THE ORIFICES WILL RESULT IN IMPROPER AND
INEFFICIENT OPERATION OF THE APPLIANCE RESULTING
IN THE PRODUCTION OF INCREASED LEVELS OF CARBON
MONOXIDE GAS IN EXCESS OF SAFE LIMITS WHICH COULD
RESUL T IN SERIOUS PERSONAL INJURY OR DEATH.
You should contact your gas supplier for any specific changes
which may be required in your area.
As elevation above sea level is increased, there is less oxygen
per cubic foot of air. Therefore, the heater input rate should be
reduced at high altitudes for satisfactory operation with the reduced
oxygen supply. Failure to make this reduction would result in an
overfiring of the heater causing sooting, poor combustion and/or
unsatisfactory heater performance.
The input reduction is primarily achieved by reducing the size of
the main burner orifices. T o do this, the main burner orifices require
replacement with orifices sized for the particular installation
elevation. Correct orifice sizing and parts may be obtained from
A.O. Smith Water Products Company. When ordering, be sure
to state the model number and the altitude of the location where
the water heater is being installed.
Upon completion of derating of the heater, adjustment to the gas
pressure regulator may be required. See CHECKING THE INPUT
section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes,
the output rating of the appliance is reduced and should be
compensated for in the sizing of the equipment for application.
FEATURES
THE ELIMINA TOR
(SELF-CLEANING SYSTEM)
These units include The Eliminator (Self-Cleaning System)
installed in the front water inlet. See figure 2. The Eliminator
must be oriented correctly for proper function. There is a marked
range on the pipe nipple portion of the Eliminator, that must be
aligned with the top of the inlet spud. A label above the jacket
hole has an arrow that will point to the marked portion of the pipe
nipple if the orientation is correct. If the arrow does not point within
the marked range on the pipe nipple, adjust the pipe nipple to
correct. A pipe union is supplied with the Eliminator to reduce the
probability of misaligning the Eliminator accidentally while
tightening the connection to the inlet water supply line. Improper
orientation of the Eliminator can cause poor performance of the
heater and can significantly reduce outlet water temperatures
during heavy draws.
U.S. REQUIREMENTS
Ratings specified by manufacturers for most appliances apply
for elevations up to 2000 feet (610 m). For elevations above
2000 feet (610), ratings must be reduced at the rate of 4% for
each 1000 feet (305 m) above sea level. For example, if a heater
is rated at 120,000 Btuh (35 Kwh) at sea level, to rate the heater
at 4000 feet (1219 m), you subtract 4 (once for each thousand
feet) x 04 (4% input reduction) x 120,000 (original rating) from
the original rating. Therefore, to calculate the input rating at
4,000 feet (121.9 m): 4 x .04 x 120,000 =19,200 Btuh (5.6 Kwh),
120,000 (35 Kwh) - 19,200 (5.6 Kwh) = 100,800 Btuh (29.4 Kwh).
At 6000 feet (1829 m) the correct input rating should be 91,200
Btuh (26.7 Kwh).
CANADIAN REQUIREMENTS
Appliances with inputs up to and including 400,000 BTU (117.2
Kw) must be factory equipped with orifices for operation at specific
elevations. Standard (sea level) orifices permit operation up to
2000' (610 m) elevation. For operation between 2000' (610 m)
and 4500' (1370 m) specify "HIGH AL TITUDE OPERA TION" when
ordering the heater(s). For operation above 4500' (2370 m)
consult factory before ordering.
Field conversion for operation at altitudes other than
that specified on the heater rating plate is not permitted.
NOTE: The inlet tube may have 1, 3 or 7 cross-tubes.
FIGURE 2
For proper function, The Eliminator must be oriented correctly.
There is a marked range on the pipe nipple that must be aligned
with the top of the inlet spud (check for label on the appliance) to
assure proper orientation. Please check to confirm that the marked
range is in alignment with the top of the spud. A pipe union is
supplied with The Eliminator to help eliminate the possibility of
changing the orientation by accidentally over-tightening the inlet
supply line. Improper orientation of The Eliminator may cause
temperature build-up issues or spells of colder than usual water
temperatures.
HIGH LIMIT SWITCH
The digital thermostat (Fig. 3) cont ains the high limit (energy cutoff)
sensor. The high limit switch interrupts main burner gas flow should
the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the appliance cannot
be restarted unless the water temperature is reduced to
approximately 120°F (49°C). The high limit reset button on the
front of the control then needs to be depressed.
6
Continued manual resetting of high limit control, preceded by higher
than usual water temperature is evidence of high limit switch operation.
The following is a possible reason for high limit switch operation:
• A malfunction in the thermostatic controls would allow the gas
valve to remain open causing water temperature to exceed
the thermostat setting. The water temperature would continue
to rise until high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
DIGITAL THERMOST AT
FIGURE 3
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a Honeywell ignition module. The
solid state ignition control, fig.4, ignites the pilot burner gas by
creating a spark at the pilot assembly. Pilot gas is ignited and
burns during each running cycle. The main burner and pilot gases
are cut off during the OFF cycle. Pilot gas ignition is proven by
the pilot sensor. Main burner ignition will not occur if the pilot
sensor does not first sense pilot ignition.
at 500 Tennessee Waltz Parkway, Ashland City, TN 37015,
1-800-433-2545. In Canada, contact A.O. Smith Enterprises
LTD., P.O. Box, 310 - 768 Erie S treet, S tratford, Ontario, Canada
N5A 6T3, 1-800-265-8520.
Each automatic flue damper drive assembly is equipped with a
“Service Switch”, as shown in figure 5.
FIGURE 5
The “Service Switch” has 2 positions: AUTOMATIC
OPERATION and HOLD OPEN DAMPER. For normal
operation the switch should be in the AUTOMATIC
OPERATION position.
If there is a problem with the damper the “Service Switch”
can be placed in the HOLD OPEN DAMPER position. When
the switch is placed in the HOLD OPEN DAMPER position
the damper disc will rotate to the open position and the
heater may be used until vent assembly is repaired or
replaced. DO NOT turn the damper disc manually; damage
will occur to the drive assembly if operated manually. Refer
to TESTING DAMPER OPERATION section of this manual
for additional information.
CIRCULA TING PUMP
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the heater.
Refer to the piping diagrams in this manual for electrical hookup
information and install in accordance with the current edition of
the National Electrical Code NFPA 70. For Canada refer to the
Canadian Electrical Code CSA C22.1.
HONEYWELL IGNITION MODULE
S8600M Continuous Re-Try
FIGURE 4
AUTOMATIC FLUE DAMPER DEVICE
All units are equipped with an automatic flue damper that
reduces heat loss during the OFF cycles. The automatic flue
damper drive assembly is a field replaceable part and may be
obtained by contacting A. O. Smith Water Products Company
Only all bronze circulators should be used with commercial water
heaters.
Although circulators are oiled and operated by the manufacturer
some circulators must be oiled again before operating. Please
refer to manufacturer’s instructions.
DISHW ASHING MACHINE REQUIREMENT
These appliances meet the NSF Standard 5 for sanitary
installations when used with the following leg kits, Part No’s.
6570-0 and 6570-7.
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water flow
pressures between 15 and 25 psi (103 kPa and 173 kPa). Flow
pressures above 25 psi (173 kPa), or below 15 psi (103 kPa), will
result in improperly sanitized dishes. Where pressures are high,
a water pressure reducing or flow regulating control valve should
be used in 180°F (82°C) line to the dishwashing machine, and
should be adjusted to deliver water between these limits.
7
The National Sanitation Foundation also recommends circulation
of 180°F (82°C) water. Where this is done, the circulation should
be very gentle so that it does not cause any unnecessary
turbulence inside the water heater. The circulation should be just
enough to provide 180°F (82°C) water at the point of take-off to
the dishwashing machine. Adjust flow by means of the plug cock
in the circulating line.
INST ALLA TION INSTRUCTIONS
REQUIRED ABILITY
NEVER BE PLACED ON OR ADJACENT TO THE HEA TER. OPEN
CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE
IT WILL BE SUBJECT TO FREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD
BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE
HEA TER OR CONNECTIONS WILL NOT RESULT IN DAMAGE
TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK
ARE REQUIRED.
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
UNCRATING
The heater is shipped with the flue damper already installed. The
wiring conduit runs from the thermostat to the damper drive cover.
Before turning unit on, check to make sure the wiring conduit is
securely plugged into damper drive.
LOCATING THE HEA TER
When installing the heater , consideration must be given to proper
location. Location selected should be as close to the stack or
chimney as practicable, with adequate air supply and as
centralized with the piping system as possible.
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES
SUCH AS GAS WATER HEATERS IN ROOMS, GARAGES OR
OTHER AREAS WHERE GASOLINE, OTHER FLAMMABLE
LIQUIDS OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE
STORED, OPERA TED OR REPAIRED. FLAMMABLE VAPORS
ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE
IGNITED BY THE HEA TER’S PILOT OR MAIN BURNER FLAMES
CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES
PERMIT OPERA TION OF GAS APPLIANCES IN SUCH AREAS
IF THEY ARE INSTALLED 18” (.50 m). OR MORE ABOVE THE
FLOOR. THIS MA Y REDUCE THE RISK IF LOCA TION IN SUCH
AN AREA
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT.
the water heater must be placed on a metal or wood panel
extending beyond the full width and depth by at least 3 inches
(7.6 cm) in any direction. If the heater is installed in a carpeted
alcove, the entire floor shall be covered by the panel. Also, see
the DRAIN REQUIREMENTS.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
CANNOT BE AVOIDED.
Instead
WARNING
WHEN SUCH LOCATIONS CANNOT BE A VOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2" (5 cm) deep,
with length and width at least 2" (5 cm) greater than the diameter
of the heater and must be piped to an adequate drain. The pan
must not restrict combustion air flow.
For appliance installation locations with elevations above 2000
feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section
of this manual for input reduction procedure.
LEVELING
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.
CLEARANCES
These heaters are approved for installation on combustible
flooring in an alcove when the minimum clearance from any
combustion construction are followed as indicated in figure 6
and Table 2.
The following units are approved for installation with side, rear
and ceiling clearances as indicated below:
ABC D
(RIGHT SIDE) (LEFT SIDE) (BACK) (CEILING)
120 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
154 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
*180 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
*197 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
198 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
*199 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
200 1” (2.54 cm) 1” (2.54 cm) 1” (2.54 cm) 12” (30.48 cm)
250 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
251 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
275 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
305 2” (5.08 cm) 2” (5.08 cm) 2” (5.08 cm) 12” (30.48 cm)
**365 3” (7.75 cm) 3” (7.75 cm) 3” (7.75 cm) 12” (30.48 cm)
400 3” (7.75 cm) 3” (7.75 cm) 3” (7.75 cm) 12” (30.48 cm)
* The BTRC version has a 2” (5.08cm) to sides and rear.
** The BTRC version has a 4” (10.16cm) to sides and rear.
TABLE 2
In all installations the minimum combustible clearances from any
draft hood surface or vent piping shall be 6" (16cm). Vent piping
passing through a combustible wall or ceiling must be a continuous
run (no joints) and retain the 6" (16cm) clearance unless an
approved reducing thimble is used.
8
ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE
FIGURE 6
A service clearance of 24" (61cm) should be maintained from
serviceable parts, such as relief valves, flue baffles, flue
damper devices, thermostats, cleanout openings or drain
valves.
HARD WATER
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwashers, coffee urns, water heaters, water piping
and other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
AIR REQUIREMENTS
REFER TO THE CURRENT EDITION OF THE "NATIONAL FUEL
GAS CODE" ANSI Z223.1/NFPA 54. FOR CANADA CONSULT
NATURAL GAS AND PROPANE INSTALLATION CODE
CAN/CSA-B149.1.
WARNING
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, V APORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY OF
AIR WILL CAUSE RECIRCULA TION OF COMBUSTION PRODUCTS
RESUL TING IN AIR CONT AMINA TION THA T MA Y BE HAZARDOUS
TO LIFE. SUCH A CONDITION OFTEN WILL RESUL T IN A YELLOW ,
LUMINOUS BURNER FLAME, CAUSING CARBONING OR SOOTING
OF THE COMBUSTION CHAMBER, BURNERS AND FLUE TUBES
AND CREATES A RISK OF ASPHYXIA TION.
Where an exhaust fan is supplied in the same room with a heater ,
sufficient openings for air must be provided in the walls.
UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN
INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR
COMBUSTION. SOOTING MA Y RESUL T IN SERIOUS DAMAGE
TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
If the unconfined space is within a building of tight construction
(buildings using the following construction: weather stripping, heavy
insulation, caulking, vapor barrier, etc.), air for combustion,
ventilation and draft hood dilution must be obtained from outdoors.
The installation instructions for confined spaces in tightly constructed
buildings must be followed to ensure adequate air supply.
9
CONFINED SPACE
When drawing combustion and dilution air from inside a
conventionally constructed building to a confined space, such a
space shall be provided with two permanent openings, ONE IN
OR WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE TOP
AND ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of
at least one square inch per 1000 Btuh (2,225mm2/Kw) of the
total input of all appliances in the enclosure, but not less than 100
square inches (645 square cm).
This water heater must be vented in compliance with all local
codes, the current edition of the National Fuel Gas Code (ANSIZ223.1) and with the Category I Venting Tables.
In Canada, venting shall conform to the requirements of the current
Natural Gas and Propane Installation Code CAN/CSA-B149.1
installation code.
If any parts of the vent system are exposed to ambient
temperatures below 35 degrees F (2 degrees C) they must be
insulated to prevent condensation.
If the confined space is within a building of tight construction, air
for combustion, ventilation, and draft hood dilution must be
obtained from outdoors. When directly communicating with the
outdoors or communicating with the outdoors through vertical
ducts, two permanent openings, located in the above manner,
shall be provided. Each opening shall have a free area of not
less than one square inch per 4000 Btuh (8,900mm2/Kw) of the
total input of all appliances in the enclosure. If horizontal ducts
are used, each opening shall have a free area of not less than
one square inch per 2000 Btuh (4,450mm2/Kw) of the total input
of all appliances in the enclosure. For Canadian installations
consult CAN/CSA B149.1-00.
VENT REDUCER
The BTR(C) 250, 251, and 275 models are shipped with an 8" to 6"
diameter flue outlet adapter. Each adapter fit s on top of the installed
flue damper. Use only vent reducers supplied with the unit. The
venting must comply with the NATIONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54 and for Canadian installations consult the Natural
Gas and Propane Installation Code CAN/CSA-B149.1.
• Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
many local building codes as is the practice of venting gas
fired equipment to the duct work of ventilation systems.
• Where a separate vent connection is not available and the vent
pipe from the heater must be connected to a common vent with
an oil burning furnace, the vent pipe should enter the smaller
common vent or chimney at a point above the large vent pipe.
FIGURE 9
MUL TIPLE HEATER MANIFOLD
Figure 10 and table 3 should be used for horizontally manifolding
two or more heaters. Also see MUL TIPLE-UNIT INST ALLA TIONS
of MECHANICAL VENTING section for induced draft applications.
FIGURE 8
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST
BE FOLLOWED TO AVOID CHOKED COMBUSTION OR
RECIRCULATION OF FLUE GASES. SUCH CONDITIONS
CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will
retard a free draft.
Type B venting is recommended with these heaters. See table 3
TECHNICAL DA TA VENTING.
FIGURE 10
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages
16-22 of this manual) for typical methods of application for the
water heaters.
The water heater may be installed by itself, or with a separate
storage tank, on both single and two-temperature systems.
When used with a separate storage tank, the circulation may be
either by gravity or by means of a circulating pump. When a
circulating pump is used it is important to note that the flow rate
should be slow so that there will be a minimum of turbulence
inside the heater.
10
TECHNICAL DATA VENTING, T ABLE 3
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting mutiple tank type heaters using Type B
vent pipe, follow the installation diagram (figure 8) and
tables below which give sizing and data based upon
NFPA 54/ANSI Z223.
MODEL BTR(C)-120
Input: 120,00Btuh Total Vent Height (Feet)
Draft Hood: 5” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (inches)
120,000 1 Ft. 7 7 7 6 6 6 6 6
120,000 2 Ft. 6 6 6 6 6 6 6 5
123,000 3 Ft. 6 6 6 6 6 5 5 5
Number Combined Input
of Heaters in Thousands of Btuh Manifold and Common Vent Diameter (In inches)
2 240 108877767
3 360 10 10 10 10 8 8 7 7
4 480 12 12 12 10 10 10 8 8
MODEL BTR(C)-154
Input: 154,000 Btuh Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
154,000 1 Ft. 8 8 7 7 7 7 7 7
154,000 2 Ft. 7 7 7 7 7 6 6 6
154,000 3 Ft. 7 7 7 6 6 6 6 6
Numbers Combined Input
of Heaters in Thousands of Btuh Manifold and Common Vent Diameter (in inches)
2 308 10 10 10 8 8 7 7 7
3 462 12 12 12 10 10 10 8 8
4 618 14 14 12 12 12 10 10 10
MODEL BTR(C)-180, 197, 198, 199, 200
Input: 180,000, 190,000, 199,000 Btuh Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
180,000 1 Ft. 8 8 8 8 8 7 7 7
190,000 - 8 8 8 8 8 7 7
199,000 - - 8 8 8 8 8 7
180,000 2 Ft. 8 8 7 7 7 7 7 7
190,000 8 8 8 7 7 7 7 7
199,000 8 8 8 8 7 7 7 7
179,000 3 Ft. 7 7 7 7 7 7 6 6
190,000 8 7 7 7 7 7 6 6
197,000 8 7 7 7 7 7 7 6
199,000 8 8 7 7 7 7 7 6
Number of Combined Input
Heaters in Thousands of Btuh Manifold & Common Vent Diameter
358 10 10 10 10 8 8 7 7
2 380 12 10 10 10 10 8 7 7
394/398 12 10 10 10 10 8 8 7
537 14 12 12 12 10 10 10 8
3 570 14 12 12 12 10 10 10 10
591/597 14 14 12 12 12 10 10 10
716 14 14 14 12 12 12 10 10
4 760 16 14 14 14 12 12 10 10
788/796 16 14 14 14 12 12 12 10
11
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