MODELS BTR(C)120 THRU 400A COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER • INSTALLATION

MODELS BTR(C)120 THRU 400A COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER • INSTALLATION
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 Tennessee 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
MODELS BTR(C) 120 THROUGH 500
See Models Below
FIGURE 1
BTR MODELS 120 THROUGH 400A - TABLE 1A
MODEL
BTR120
BTR154
BTR180
BTR197
BTR198
BTR199
BTR 200
BTR 250
BTR 251
BTR 275
BTR 305
BTR 365
BTR 400
INPUT
APPROX.
RATE
TANK
BTU/Hr.
CAP.
A
120,000 BTU/Hr.
71 Gal
69.75"
35 Kw/Hr
268 L
177 cm
154,000 BTU/Hr
81 Gal
73.00"
45 Kw/Hr
307 L
185 cm
180,000 BTU/Hr
81Gal
67.50"
53 Kw/Hr
307 L
171 cm
199,000 BTR/Hr 100 Gal 75.00"
58 kW/Hr
379 L
192 cm
199,000 BTU/Hr. 100 Gal 75.00"
58 Kw/Hr
379 L
192 cm
199,000 BTU/Hr
81 Gal
67.50"
58 kW/Hr
307 L
171 cm
199,000 BTR/Hr 100 Gal 72.00"
58 kW/Hr
379 L
183 cm
250,000 BTR/Hr 100 Gal 72.00"
72 kW/Hr
379 L
183 cm
251,000 BTR/Hr
65 Gal
75.00"
73 kW/Hr
246 L
191 cm
275,000 BTR/Hr 100 Gal 72.00"
80 kW/Hr
379 L
183 cm
305,000 BTR/Hr
65 Gal
75.00"
89 kW/Hr
246 L
191 cm
365,000 BTR/Hr
85 Gal
79.50"
107 kW/Hr
322 L
202 cm
390,000 BTU/Hr 100 Gal 75.50"
114 kW/Hr
379 L
192 cm
B
4.25"
11 cm
4.25"
11 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
C
59.50"
151 cm
66.50"
169 cm
62.00"
157 cm
70.00"
178 cm
70.00"
178 cm
62.00"
157 cm
65.13"
165 cm
65.13"
165 cm
65.75"
167 cm
65.13"
165 cm
65.75"
167 cm
70.25"
178 cm
67.50"
171 cm
D
50.87"
129 cm
57.87"
147 cm
53.62"
136 cm
61.62"
157 cm
61.62"
157 cm
53.62"
136 cm
55.87"
142 cm
55.87"
142 cm
57.25"
145 cm
55.87"
142 cm
57.25"
145 cm
62.50"
159 cm
58.25"
148 cm
E
19.69"
50 cm
19.69"
50 cm
20.50"
52 cm
20.50"
52 cm
20.50"
52 cm
20.50"
52 cm
19.75"
50 cm
19.75"
50 cm
20.00"
51 cm
19.75"
50 cm
20.00"
51 cm
22.50"
57 cm
26.75"
68 cm
F
19"
48 cm
19"
48 cm
21"
53 cm
21"
53 cm
21"
53 cm
21"
53 cm
23"
58 cm
23"
58 cm
NA
NA
23"
58 cm
NA
NA
23”
58 cm
23"
58 cm
GAS
INLET
G
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
3/4"
3/4"
3/4"
3/4"
H
51.88"
132 cm
59.00"
150 cm
54.62"
139 cm
62.62"
159 cm
61.50"
150 cm
54.62"
139 cm
56.38"
143 cm
56.38"
143 cm
58.75
149 cm
56.38"
143 cm
58.75
149 cm
63.00
160 cm
59.00"
150 cm
VENT
DIA
I
5"
13 cm
6"
15 cm
6"
15 cm
6"
15 cm
6"
15 cm
6"
15 cm
6"
15 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
J
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
30.25"
77 cm
30.25"
77 cm
27.75"
70 cm
30.25"
77 cm
27.75"
70 cm
27.75"
70 cm
30.25"
77 cm
TOP
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
NA
NA
1.50"
1.50"
NA
NA
1.50"
1.50"
1.50"
1.50"
INLET
FRONT
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
2.00"
2.00"
1.50"
1.50"
2.00"
2.00"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
CONNECTIONS
OUTLET
BACK TOP FRONT
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
2.00" 1.50" 1.50"
2.00" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
1.50"
NA
1.50"
1.50"
NA
1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
1.50"
NA
1.50"
1.50"
NA
1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
BACK
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
1.50"
1.50"
2.00"
2.00"
2.00"
2.00"
1.50"
1.50"
2.00"
2.00"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
Approximate
ship. Weight
STD.
ASME
400 Lbs
NA
182 Kg
NA
470 Lbs
NA
213 Kg
NA
470 Lbs
NA
213 Kg
NA
603 Lbs
NA
273 Kg
NA
603 Lbs
NA
273 Kg
NA
470 Lbs
NA
213 Kg
NA
630 Lbs
725 Lbs
286 Kg
329 Kg
630 Lbs
725 Lbs
286 Kg
329 Kg
750Lbs
862 Lbs
341 Kg
391 Kg
630 Lbs
725 Lbs
286 Kg
329 Kg
750 Lbs
862 Lbs
341 Kg
391 Kg
725 Lbs
833 Lbs
329 Kg
379 Kg
760 Lbs
874 Lbs
345 Kg
396 Kg
BACK
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
2.00"
2.00"
1.50"
1.50"
2.00"
2.00"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
Approximate
ship. Weight
STD.
ASME
400 LBS
NA
182 Kg
NA
470 LBS
NA
213 Kg
NA
470 LBS
NA
213 Kg
NA
603 LBS
NA
273 Kg
NA
470 LBS
NA
213 Kg
NA
630 lbs
725 lbs
286 Kg
329 Kg
630 lbs
725 lbs
286 Kg
329 Kg
750 lbs
862 lbs
341 Kg
391 Kg
630 lbs
725 lbs
286 Kg
329 Kg
750 lbs
862 lbs
341 Kg
391 Kg
750 lbs
862 lbs
341 Kg
391 Kg
760 lbs
874 lbs
345 Kg
396 Kg
BTRC MODELS 120 THROUGH 400/A - TABLE 1B
MODEL
BTRC120
BTRC154
BTRC180
BTRC197
BTRC199
BTRC200
BTRC250
BTRC251
BTRC275
BTRC305
BTRC365
BTRC400
INPUT
APPROX.
RATE
TANK
BTU/Hr.
CAP.
A
120,000 BTU/Hr.
71 Gal
69.75"
35 Kw/Hr
268 L
177 cm
154,000 BTU/Hr
81 Gal
73.00"
45 Kw/Hr
307 L
185 cm
180,000 BTU/Hr
76 Gal
70.50"
53 Kw/Hr
288 L
179 cm
199,000 BTR/Hr
95 Gal
81.50"
58 kW/Hr
360 L
207 cm
199,000 BTU/Hr
76 Gal
70.50"
58 kW/Hr
288 L
179 cm
199,000 BTR/Hr 100 Gal 72.00"
58 kW/Hr
379 L
183 cm
250000 BTR/Hr 100 Gal 72.00"
72 kW/Hr
379 L
183 cm
251000 BTR/Hr
65 Gal
75.00"
73 kW/Hr
246 L
191 cm
275,000 BTR/Hr 100 Gal 72.00"
80 kW/Hr
379 L
183 cm
305,000 BTR/Hr
65 Gal
75.00"
89 kW/Hr
246 L
191 cm
365,000 BTR/Hr
65 Gal
75.00"
107 kW/Hr
246 L
191 cm
390,000 BTU/Hr 100 Gal 75.50"
114 kW/Hr
379 L
192 cm
B
4.25"
11 cm
4.25"
11 cm
4.25"
11 cm
4.25"
11 cm
4.25"
11 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
4.50"
12 cm
C
59.50"
151 cm
66.50"
169 cm
63.75"
162 cm
74.75"
190 cm
63.75"
162 cm
65.13"
165 cm
65.13"
165 cm
65.75"
167 cm
65.13"
165 cm
65.75"
167 cm
65.75"
167 cm
67.50"
171 cm
D
50.87"
129 cm
57.87"
147 cm
55.13"
140 cm
66.13"
168 cm
55.13"
140 cm
55.87"
142 cm
55.87"
142 cm
57.25"
145 cm
55.87"
142 cm
57.25"
145 cm
57.25"
145 cm
58.25"
148 cm
E
19.69"
50 cm
19.69"
50 cm
17.75"
45 cm
17.75"
45 cm
17.75"
45 cm
19.75"
50 cm
19.75"
50 cm
20.00"
51 cm
19.75"
50 cm
20.00"
51 cm
20.00"
51 cm
26.75"
68 cm
F
19"
48 cm
19"
48 cm
19"
48 cm
19"
48 cm
19"
48 cm
23"
58 cm
23"
58 cm
NA
NA
23"
58 cm
NA
NA
NA
NA
23"
58 cm
GAS
INLET
G
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
3/4"
3/4"
3/4"
3/4"
2
H
51.88"
132 cm
59.00"
150 cm
56.50"
144 cm
67.50"
171 cm
56.50"
144 cm
56.38"
143 cm
56.38"
143 cm
58.8
149 cm
56.38"
143 cm
58.8
149 cm
58.8
149 cm
59.00"
150 cm
VENT
DIA
I
5"
13 cm
6"
15 cm
6"
15 cm
6"
15 cm
6"
15 cm
6"
15 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
8"
20 cm
J
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
27.75"
71 cm
30.25"
77 cm
30.25"
77 cm
27.75"
70 cm
30.25"
77 cm
27.75"
70 cm
27.75"
70 cm
30.25"
77 cm
TOP
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
NA
NA
1.50"
1.50"
NA
NA
NA
NA
1.50"
1.50"
INLET
FRONT
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
2.00"
2.00"
1.50"
1.50"
2.00"
2.00"
1.50"
1.50"
1.50"
1.50"
2.00"
2.00"
CONNECTIONS
OUTLET
BACK TOP FRONT
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
1.50" 1.50" 1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
1.50"
NA
1.50"
1.50"
NA
1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
1.50"
NA
1.50"
1.50"
NA
1.50"
1.50"
NA
1.50"
1.50"
NA
1.50"
2.00" 1.50" 2.00"
2.00" 1.50" 2.00"
TABLE 1C - HEATER PERFORMANCE DATA BTR MODELS
MODEL
BTR
120
BTR
154
BTR
180
BTR
197
BTR
198
BTR
199
BTR
200
BTR
250
BTR
251
BTR
275
BTR
305
BTR
365
BTR
400
INPUT
APPROX.
RATE
GAL
EFF.
BTUH
CAP.
%
120,000 BTUH
71 Gal
80
35 Kw/Hr
268 L
154,000 BTUH
81 Gal
80
45 Kw/Hr
306 L
180,000 BTUH
81 Gal
80
53 Kw/Hr
306L
199,000 BTUH 100 Gal
80
58 Kw/Hr
379 L
199,000 BTUH 100 Gal
80
58 Kw/Hr
379L
199,000 BTUH
81 Gal
80
58 Kw/Hr
306 L
199,000 BTUH 100 Gal
80
58 Kw/Hr
379 L
250,000 BTUH 100 Gal
80
73 Kw/Hr
379 L
251,000 BTUH
65 Gal
80
73 Kw/Hr
246 L
275,000 BTUH 100 Gal
80
80 Kw/Hr
379 L
305,000 BTUH
65 Gal
80
89 Kw/Hr
246 L
365,000
85 Gal
80
107 Kw/Hr
322 L
390,000 BTUH 100 Gal
80
114 Kw/Hr
379 L
30° F
(-)1° C
388
1469
498
1885
579
2192
643
2434
643
2434
614
2324
643
2434
808
3059
811
3071
889
3365
986
3732
1180
4466
1293
4894
RECOVERY RATING CAPACITIES (GPH AND LPH)
40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F
4° C 10° C 15° C 21° C 27° C 32° C 38° C 43° C 49° C 54° C 60° C
291
233
194 166
145
129
116
106
97
90
83
1102 882
734 628
549
488
439
401
367
341
314
373
299
249 213
187
166
149
136
124
115
107
1412 1132 943 806
708
628
564
515
469
435
405
434
347
289 248
217
193
174
158
145
134
124
1643 1314 1094 939
821
731
659
598
549
507
469
482
386
322 276
241
214
193
175
161
148
132
1825 1461 1219 1045 912
810
731
662
609
560
500
482
386
322 276
241
214
193
175
161
148
132
1825 1461 1219 1045 912
810
731
662
609
560
500
461
368
307 263
230
205
184
167
154
142
132
1745 1393 1162 996
871
776
697
632
583
538
500
482
386
322 276
241
214
193
175
161
148
132
1825 1461 1219 1045 912
810
731
662
609
560
500
606
485
404 346
303
269
242
220
202
186
173
2294 1835 1529 1311 1147 1020 918
834
765
706
655
608
487
406 348
304
270
243
221
203
187
174
2303 1843 1536 1316 1152 1024 921
838
768
709
658
667
533
444 381
333
296
267
242
222
205
190
2524 2019 1682 1442 1262 1122 1009 918
841
776
721
739
592
493 423
370
329
296
269
246
228
211
2799 2239 1866 1599 1399 1244 1120 1018
933
861
800
885
708
590 506
442
393
354
322
295
272
253
3349 2680 2233 1914 1675 1489 1340 1218
1116
1031 957
970
776
646 554
485
431
388
353
323
298
277
3671 2936 2447 2097 1835 1631 1468 1335 1224 1129 1049
TABLE 1D - HEATER PERFORMANCE DATA BTR(C) MODELS
MODEL
BTRC
120
BTRC
154
BTRC
180
BTRC
197
BTRC
199
BTRC
200
BTRC
250
BTRC
251
BTRC
275
BTRC
305
BTRC
365
BTRC
400
INPUT
APPROX.
RATE
GAL
EFF.
BTUH
CAP.
%
120,000 BTUH
71 Gal
80
35 Kw/Hr
268 L
154,000 BTUH
81 Gal
80
45 Kw/Hr
306 L
180,000 BTUH
76 Gal
80
53 Kw/Hr
288L
199,000 BTUH
95 Gal
80
58 Kw/Hr
360 L
199,000 BTUH
76 Gal
80
58 Kw/Hr
288 L
199,000 BTUH 100 Gal
80
58 Kw/Hr
379 L
250,000 BTUH 100 Gal
80
73 Kw/Hr
379 L
251,000 BTUH
65 Gal
80
73 Kw/Hr
246 L
275,000 BTUH 100 Gal
80
80 Kw/Hr
379 L
305,000 BTUH
65 Gal
80
89 Kw/Hr
246 L
360,000 BTUH
65 Gal
80
105 Kw/Hr
246 L
390,000 BTUH 100 Gal
80
114 Kw/Hr
379 L
30° F
(-)1° C
388
1469
498
1885
579
2192
643
2434
614
2324
643
2434
808
3059
811
3071
889
3365
986
3732
1164
4405
1293
4894
RECOVERY RATING CAPACITIES (GPH AND LPH)
40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F
4° C 10° C 15° C 21° C 27° C 32° C 38° C 43° C 49° C 54° C 60° C
291
233
194 166
145
129
116
106
97
90
83
1102 882
734 628
549
488
439
401
367
341
314
373
299
249 213
187
166
149
136
124
115
107
1412 1132 943 806
708
628
564
515
469
435
405
434
347
289 248
217
193
174
158
145
134
124
1643 1314 1094 939
821
731
659
598
549
507
469
482
386
322 276
241
214
193
175
161
148
132
1825 1461 1219 1045 912
810
731
662
609
560
500
461
368
307 263
230
205
184
167
154
142
132
1745 1393 1162 996
871
776
697
632
583
538
500
482
386
322 276
241
214
193
175
161
148
132
1825 1461 1219 1045 912
810
731
662
609
560
500
606
485
404 346
303
269
242
220
202
186
173
2294 1835 1529 1311 1147 1020 918
834
765
706
655
608
487
406 348
304
270
243
221
203
187
174
2303 1843 1536 1316 1152 1024 921
838
768
709
658
667
533
444 381
333
296
267
242
222
205
190
2524 2019 1682 1442 1262 1122 1009 918
841
776
721
739
592
493 423
370
329
296
269
246
228
211
2799 2239 1866 1599 1399 1244 1120 1018
933
861
800
873
698
582 499
436
388
349
317
291
269
249
3304 2643 2202 1888 1652 1468 1321 1201 1101 1016 944
970
776
646 554
485
431
388
353
323
298
277
3671 2936 2447 2097 1835 1631 1468 1335 1224 1129 1049
3
TABLE OF CONTENTS
Page
Page
Grounding Instructions ---------------------------------------------- 15
Heater Wiring ---------------------------------------------------------- 15
INSTALLATION 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 ------------------------------------------------------- 30
Remote Storage Tank Temperature Control ------------------- 30
Relief Valve ------------------------------------------------------------ 30
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
ROUGH-IN-DIMENSIONS ---------------------------------------- 2-3
TABLE OF CONTENTS ---------------------------------------------- 4
FOREWORD ----------------------------------------------------------- 4
GENERAL SAFETY INFORMATION ----------------------------- 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
INSTALLATION 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
FOREWORD
These designs comply with ANSI Z21.10.3/CSA 4.3 as an
automatic circulating or automatic storage tank type water heater.
the heater will operate is the same as that specified on the heater
model and rating plate.
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.
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.
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.
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/NFPA 54 and the National Electrical
Code, NFPA 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.
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
4
LIQUID PETROLEUM MODELS
GENERAL SAFETY
INFORMATION
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.
PRECAUTIONS
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.
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.
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.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO NOT
TRY TO RELIGHT APPLIANCES YOURSELF, Ask your LP
delivery person to relight pilots for you. Only trained LP
professionals should conduct the required safety checks in
accordance with industry standards.
4. SOOTING
CHEMICAL VAPOR CORROSION
EXTENDED NON-USE PERIODS
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.
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. To 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 AT THE TIME
IT IS OPEN.
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.)
INSULATION BLANKETS
IMPROPER COMBUSTION
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
ATTIC AND/OR EXHAUST FANS OPERATING ON THE
PREMISES WITH A WATER HEATER CAN RESULT IN CARBON
MONOXIDE POISONING AND DEATH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THE AREA OF THE WATER HEATER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGH THE CHIMNEY OR VENT PIPE.
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.
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 apply insulation to the top of the water heater, as this
will interfere with safe operation of drafthood.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
• 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.
The input reduction is primarily achieved by reducing the size of
the main burner orifices. To 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.
• 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.
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.
• 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.
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.
HIGH ALTITUDE INSTALLATIONS
FEATURES
WARNING
THE ELIMINATOR
(SELF-CLEANING SYSTEM)
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 INSTALLATION 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
RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
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.
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.
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).
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.
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 ALTITUDE OPERATION" when
ordering the heater(s). For operation above 4500' (2370 m)
consult factory before ordering.
HIGH LIMIT SWITCH
The digital thermostat (Fig. 3) contains 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.
Field conversion for operation at altitudes other than
that specified on the heater rating plate is not permitted.
6
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 Street, Stratford, Ontario, Canada
N5A 6T3, 1-800-265-8520.
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.
Each automatic flue damper drive assembly is equipped with a
“Service Switch”, as shown in figure 5.
Contact your dealer or service agent if continued high limit switch
operation occurs.
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.
DIGITAL THERMOSTAT
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.
CIRCULATING 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.
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.
DISHWASHING 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.
HONEYWELL IGNITION MODULE
S8600M Continuous Re-Try
FIGURE 4
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.
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
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.
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. 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
HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE
TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, 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.
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.
For appliance installation locations with elevations above 2000
feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section
of this manual for input reduction procedure.
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
LEVELING
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.
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.
LOCATING THE HEATER
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.
CLEARANCES
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.
The following units are approved for installation with side, rear
and ceiling clearances as indicated below:
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, OPERATED OR REPAIRED. FLAMMABLE VAPORS
ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE
IGNITED BY THE HEATER’S PILOT OR MAIN BURNER FLAMES
CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES
PERMIT OPERATION OF GAS APPLIANCES IN SUCH AREAS
IF THEY ARE INSTALLED 18” (.50 m). OR MORE ABOVE THE
FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN SUCH
AN AREA CANNOT BE AVOIDED.
120
154
*180
*197
198
*199
200
250
251
275
305
**365
400
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead
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.
A
B
(RIGHT SIDE) (LEFT SIDE)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
3” (7.75 cm)
3” (7.75 cm)
3” (7.75 cm)
3” (7.75 cm)
C
(BACK)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
1” (2.54 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
2” (5.08 cm)
3” (7.75 cm)
3” (7.75 cm)
D
(CEILING)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 cm)
12” (30.48 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
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
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.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
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.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY OF
AIR WILL CAUSE RECIRCULATION OF COMBUSTION PRODUCTS
RESULTING IN AIR CONTAMINATION THAT MAY BE HAZARDOUS
TO LIFE. SUCH A CONDITION OFTEN WILL RESULT IN A YELLOW,
LUMINOUS BURNER FLAME, CAUSING CARBONING OR SOOTING
OF THE COMBUSTION CHAMBER, BURNERS AND FLUE TUBES
AND CREATES A RISK OF ASPHYXIATION.
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.
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 MAY RESULT IN SERIOUS DAMAGE
TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
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.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
WARNING
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.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
9
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.
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).
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.
• 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.
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.
• 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.
VENT REDUCER
The BTR(C) 250, 251, and 275 models are shipped with an 8" to 6"
diameter flue outlet adapter. Each adapter fits 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.
FIGURE 9
MULTIPLE HEATER MANIFOLD
Figure 10 and table 3 should be used for horizontally manifolding
two or more heaters. Also see MULTIPLE-UNIT INSTALLATIONS
of MECHANICAL VENTING section for induced draft applications.
FIGURE 8
VENTING
FIGURE 10
WARNING
WATER LINE CONNECTIONS
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.
This manual provides detailed installation diagrams (see pages
16-22 of this manual) for typical methods of application for the
water heaters.
Heater must be protected from freezing downdrafts.
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.
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 DATA VENTING.
10
TECHNICAL DATA VENTING, TABLE 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
Draft Hood: 5”
Number
of Heaters
2
3
4
MODEL BTR(C)-154
Input: 154,000 Btuh
Draft Hood: 6”
Numbers
of Heaters
2
3
4
Input Btuh
120,000
120,000
123,000
Combined Input
in Thousands of Btuh
240
360
480
Rise
1 Ft.
2 Ft.
3 Ft.
Total Vent Height (Feet)
6
8
10
15
20
30
50
Vent Connector Diameter (inches)
7
7
7
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
5
5
MODEL BTR(C)-180, 197, 198, 199, 200
Input: 180,000, 190,000, 199,000 Btuh
Draft Hood: 6”
Input Btuh
180,000
190,000
199,000
180,000
190,000
199,000
179,000
190,000
197,000
199,000
Number of
Combined Input
Heaters
in Thousands of Btuh
358
2
380
394/398
537
3
570
591/597
716
4
760
788/796
6
5
5
Manifold and Common Vent Diameter (In inches)
10
8
8
7
7
7
6
7
10
10
10
10
8
8
7
7
12
12
12
10
10
10
8
8
6
Input Btuh
154,000
154,000
154,000
Combined Input
in Thousands of Btuh
308
462
618
100
Rise
1 Ft.
2 Ft.
3 Ft.
8
7
7
Total Vent Height (Feet)
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
8
7
7
7
7
7
7
7
7
7
7
6
6
6
7
7
6
6
6
6
6
Manifold and Common Vent Diameter (in inches)
10
10
10
8
8
7
7
7
12
12
12
10
10
10
8
8
14
14
12
12
12
10
10
10
8
8
8
8
7
8
8
8
Total Vent Height (Feet)
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
8
8
8
8
7
7
7
8
8
8
8
8
7
7
8
8
8
8
8
7
8
7
7
7
7
7
7
8
8
7
7
7
7
7
8
8
8
7
7
7
7
7
7
7
7
7
6
6
7
7
7
7
7
6
6
7
7
7
7
7
7
6
8
7
7
7
7
7
6
10
12
12
14
14
14
14
16
16
Manifold & Common Vent Diameter
10
10
10
8
8
7
10
10
10
10
8
7
10
10
10
10
8
8
12
12
12
10
10
10
12
12
12
10
10
10
14
12
12
12
10
10
14
14
12
12
12
10
14
14
14
12
12
10
14
14
14
12
12
12
6
Rise
1 Ft.
2 Ft.
3 Ft.
11
7
7
7
8
10
10
10
10
10
TECHNICAL DATA VENTING, TABLE 3 (Continued)
MODEL BTR(C)-250, 251
Input: 250,000, 251,000
Draft Hood: 6”
Number
of Heaters
2
3
4
MODEL BTR(C)-275
Input: 275,000 Btuh
Draft Hood: 6”
Numbers
of Heaters
2
3
4
MODEL BTR(C)-305
Input: 305,000 Btuh
Draft Hood: 8”
Number of
Heaters
2
3
4
MODEL BTR(C)-365, 400
Input: 365,000, 399,000
Draft Hood: 8”
Number of
Heaters
2
3
4
Input Btuh
250/251,000
250/251,000
250/251,000
Combined Input
in Thousands of Btuh
480
500/502
720
750/753
960/1000/1004
Rise
1 Ft.
3 Ft.
Manifold and Common Vent Diameter (In inches)
14
12
12
10
10
10
8
14
12
12
10
10
10
10
14
14
14
12
12
12
10
16
14
14
14
12
12
10
18
16
16
14
14
14
12
6
Input Btuh
275,000
275,000
Combined Input
in Thousands of Btuh
550
825
1100
Rise
2 Ft.
3 Ft.
-
6
Input Btuh
315,000
305,000
365,000
Combined Input
in Thousands of Btuh
610
915
1220
Rise
1 Ft.
2 Ft.
3 Ft.
10
10
Input Btuh
365,000
400,000
365,000
400,000
365,000
400,000
Combined Input
in Thousands of Btuh
730
800
1095
1200
1460
1600
Rise
1 Ft.
2 FT.
3 FT.
Input Btuh
500,000
500,000
500,000
Combined Input
in Thousands of Btuh
1000
1500
2000
12
12
10
12
10
12
12
Total Vent Height (Feet)
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
10
10
10
10
10
10
10
10
10
10
10
8
8
10
10
10
10
8
8
8
Manifold & Common Vent Diameter
14
14
12
12
12
10
10
16
16
16
14
14
12
12
18
18
16
16
16
14
14
6
8
8
10
10
12
Total Vent Height (Feet)
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
8
8
8
8
8
8
8
8
Manifold and Common Vent Diameter (in inches)
12
10
10
10
14
14
12
12
16
14
14
12
10
12
12
Total Vent Height (Feet)
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
10
10
10
10
10
12
10
10
10
10
10
10
12
12
12
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Manifold & Common Vent Diameter (inches)
14
14
14
12
12
12
10
10
16
14
14
14
12
12
10
10
18
18
16
16
14
14
12
12
18
18
18
16
16
14
14
12
20
20
18
18
16
16
14
12
22
20
20
18
18
16
14
14
MODEL BTR(C)-500
Input: 500,000 Btuh
Draft Hood: 8”
Number of
Heaters
2
3
4
Total Vent Height (Feet)
6
8
10
15
20
30
50
100
Vent Connector Diameter (in inches)
8
8
8
8
8
8
8
8
8
8
8
7
7
Rise
2 Ft.
4 Ft.
6 Ft.
Total Vent Height (Feet)
6
8
10
15
20
30
Vent Connector Diameter (in inches)
12
12
12
12
12
12
12
12
12
12
12
N/A
12
12
12
12
12
50
100
12
10
10
12
10
10
Manifold & Common Vent Diameter (inches)
18
16
16
14
14
14
12
12
22
20
20
18
16
16
14
12
24
22
22
20
20
18
16
14
12
If a water heater is installed in a closed water system, contact the
water supplier or local plumbing inspector on how to control this
situation.
be installed with a properly sized, rated and approved combination
temperature (ANSI) and pressure (ASME) relief valve(s).
WATER (POTABLE) HEATING AND
SPACE HEATING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSURE OR TEMPERATURE INTO THE STEAM RANGE,
WHICH MAY CAUSE SCALDING AT FIXTURES, TANK
EXPLOSION, SYSTEM OR HEATER DAMAGE. NO VALVE IS
TO BE PLACED BETWEEN THE RELIEF VALVE AND TANK.
WARNING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
Your local code authority may have other specific relief valve
requirements.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF
VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION TO
AVOID SCALDING OR WATER DAMAGE. THIS LINE MUST
NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET
AND MUST NOT CONTAIN VALVES, RESTRICTIONS NOR
SHOULD IT BE LOCATED IN FREEZING AREAS. DO NOT
THREAD OR CAP THE END OF THIS LINE. RESTRICTED
OR BLOCKED DISCHARGE WILL DEFEAT THE PURPOSE
OF THE VALVE AND IS UNSAFE. DISCHARGE LINE SHALL
BE INSTALLED TO ALLOW COMPLETE DRAINAGE OF BOTH
THE VALVE AND LINE.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to installation diagrams on pages 16 through 21 in this manual
for suggested piping arrangements.
CAUTION
See SERVICE INFORMATION section for procedure and
precautions.
A closed system will exist if a check valve (without bypass),
pressure reducing valve (without bypass), or a water meter (without
bypass) is installed in the cold water line between the water heater
and street main (or well).
GAS PIPING
Contact your local gas service company to ensure that adequate
gas service is available and to review applicable installation codes
for your area.
Excessive pressure may develop in such closed systems, causing
premature tank failure or intermittent relief valve operation. This
is not a warranty failure. An expansion tank or a similar device
may be required in the inlet supply line between the appliance
and the meter or valve to compensate for the thermal expansion
of the water.
Size the main gas line in accordance with Table 4. The figures
shown are for straight lengths of pipe at 0.5 in. W.C. pressure drop,
which is considered normal for low pressure systems. Note:
Fittings such as elbows, tees and line regulators will add to
the pipe pressure drop. Also refer to the current edition of the
National Fuel Gas Code. For Canadian installations consult
Natural Gas and Propane Installation Code CAN/CSA-B149.1.
SYSTEM CONNECTIONS
The system installation must conform to these instructions and to
the local code authority having jurisdiction. Good practice requires
that all heavy piping be supported.
TABLE 4 - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
THERMOMETERS (Not Supplied)
LENGTH
IN
FEET
10
20
30
40
50
60
70
80
90
100
125
150
175
200
Thermometers should be obtained and field installed as shown in
the installation diagrams.
Thermometers are installed in the system as a means of detecting
the temperature of the outlet water supply.
RELIEF VALVE
This water heater is equipped with a combination temperaturepressure relief valve that complies with the standard for relief
valves and automatic gas shut-off devices for hot water supply
system, ANSI Z21.22-CSA 4.4. FOR SAFE OPERATION OF THE
WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE
REMOVED OR PLUGGED.
NOMINAL IRON PIPE SIZES (INCHES)
1/2” 3/4”
175 360
120 250
97 200
82 170
73 151
66 138
61 125
57 118
53 110
50 103
44
93
40
84
37
77
35
72
1” 1 1/4”
680 1400
465 950
375 770
320 660
285 580
260 530
240 490
220 460
205 430
195 400
175 360
160 325
145 300
135 280
1 1/2”
2100
1460
1180
990
900
810
750
690
650
620
550
500
460
430
2”
3960
2750
2200
1900
1680
1520
1400
1300
1220
1150
1020
950
850
800
2 1/2”
6300
4360
3520
3000
2650
2400
2250
2050
1950
1850
1650
1500
1370
1280
3”
11000
7700
6250
5300
4750
4300
3900
3700
3450
3250
2950
2650
2450
2280
4”
23000
15800
12800
10900
9700
8800
8100
7500
7200
6700
6000
5500
5000
4600
ASME ratings cover pressure relief capacities. ANSI ratings cover
release rate with temperature actuation.
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14.0" W.C.(3.5 kPa) (1/2 POUND PER SQUARE INCH
In addition to the appliance relief valve, each remote storage tank
which may be used in conjunction with this appliance shall also
13
GAGE- 3.5 kPa) SUPPLY GAS PRESSURE. EXPOSURE TO
HIGHER SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE
GAS VALVE WHICH COULD RESULT IN FIRE OR EXPLOSION.
IF OVERPRESSURE HAS OCCURRED SUCH AS THROUGH
IMPROPER TESTING OF GAS LINES OR EMERGENCY
MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE
MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE
THAT THE OUTSIDE VENTS ON THE SUPPLY REGULATORS
AND THE SAFETY VENT VALVES ARE PROTECTED AGAINST
BLOCKAGE. THESE ARE PARTS OF THE GAS SUPPLY
SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY OCCUR
DURING ICE STORMS.
SUPPLIERS. REFER TO THE CURRENT EDITION OF THE
NATIONAL FUEL GAS CODE. For Canadian installations consult
Natural Gas and Propane Installation Code CAN/CSA-B149.1.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compounds to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases.
GAS PIPING AND DIRT LEG INSTALLATION
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING
FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING
MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE
INTERNALLY TINNED AND CERTIFIED FOR GAS SERVICE.
BEFORE ATTACHING THE GAS LINE, BE SURE THAT ALL GAS
PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT
TRAP OR DRIP LEG) MUST BE INCORPORATED IN THE PIPING
(SEE FIG. 11). THE DIRT LEG MUST BE READILY ACCESSIBLE
AND NOT SUBJECT TO FREEZING CONDITIONS. INSTALL IN
ACCORDANCE WITH RECOMMENDATIONS OF SERVING GAS
FIGURE 11
FIGURE 12
14
Do not subject the combination gas valve to inlet gas
pressures of more than 14.0" W.C. (3.48 kPa) - natural gas,
14.0" W.C. (3.48 kPa)- propane gas. A service regulator is
necessary if higher gas pressures are encountered.
BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE. Use soap and water solution or other material
acceptable for the purpose in locating the leaks. DO NOT USE
MATCHES, CANDLES, FLAME OR OTHER SOURCES OF
IGNITION FOR THIS PURPOSE.
Gas pressure specified in Table 5, refer to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
DISCONNECT THE HEATER AND ITS MANUAL GAS SHUT-OFF
VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY
SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSIG (3.5 kPa).
GAS SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED
FROM THE HEATER FOR TEST PRESSURES OF 1/2 PSIG
(3.5 kPa) OR LESS. THE APPLIANCE NEED NOT BE
DISCONNECTED, BUT MUST BE ISOLATED FROM THE
SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS
Shut-off VALVE.
GROUNDING INSTRUCTIONS
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding
conductor must be run with the circuit conductors and
connected to the equipment grounding terminal or lead on the
water heater.
GAS METER SIZE — NATURAL GASES ONLY
HEATER WIRING
Be sure the gas meter has sufficient capacity to supply the full
rated gas input of the water heater as well as the requirements of
all other gas fired equipment supplied by the meter. If gas meter
is too small, ask the gas company to install a larger meter having
adequate capacity.
All electrical work must be installed in accordance with the current
edition of the National Electrical Code NFPA 70, for Canada use
Canadian Electric Code CSA C22.1 and must conform to all local
code authority having jurisdiction. AN ELECTRICAL GROUND
IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR
POSSIBLE ELECTROCUTION.
GAS PRESSURE REGULATOR
The gas pressure regulator is built into the gas valve and is
equipped to operate on the gas specified on model and rating
plate. The regulator is factory adjusted to deliver gas to burner at
correct water column pressure allowing for a nominal pressure
drop through the controls.
For Canadian installations the electrical connections and
grounding shall be done in accordance with current Canadian
Electrical Code CSA C22.1, Part 1 and/or local codes.
If any of the original wire as supplied with the appliance must be
replaced, use only type 105°C thermoplastic or equivalent. 250°C
type F must be used for the flame sensor leads and the spark
ignition cable must be high voltage 250°C.
The minimum gas supply pressure for input adjustment must not
be less than 4.5" w.c. (1.12 kPa) for natural gas and 11.0" w.c.
(2.74 kPa) for propane gas.
INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE
installations in the state of North Carolina, due to the material of
the tube (Polypropylene). Where such code restrictions exist,
use only lower inlet tank connection. This may also require a
heat trap - check local codes. The “Top Outlet” connection may
still be used on these applications. Plug or cap all unused
openings in the tank before filling with water.
GENERAL
The type, size and location of the relief valves must be in
accordance with local codes. The locations of the relief valves
shown in the installation diagrams are typical. The heater has a
factory installed high temperature limit switch and temperature
and pressure relief valve.
DANGER
Cold water lines to heater should be installed as shown in order
to minimize gravity circulation of hot water to building cold water
lines.
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
A listed temperature and pressure relief valve of adequate capacity
is installed on the heater. The locations shown in the installation
diagrams on the following pages are typical.
The discharge opening of the temperature and pressure relief
valve, located in front of the heater must be piped to an open
drain and should not be subject to freezing temperatures.
TUBE INLET INSTALLATION
Install in accordance with all local codes.
Use of the top inlet water connection requires installation of an
inlet dip tube (refer to figure 11). The tube is supplied in the
heater. Follow caution labels if applying heat to this fitting. Do
not allow pipe dope to contact the plastic tube during installation.
CODE RESTRICTIONS
Use of the top inlet water connection is not permitted on
FIGURE 13
15
VERTICAL STORAGE TANK AND FORCED CIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER
OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
HORIZONTAL STORAGE TANK AND FORCED CIRCULATION
16
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE
WITH RECIRCULATION OF SANITIZING LOOP
DANGER
NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATER
CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING
MACHINE. TOGGLE SWITCH MUST BE CLOSED (ON) DURING
THE RINSE OPERATION AND OPEN (OFF) WHEN DISHWASHER
IS NOT OPERATING OR WHEN ON LONG STANDBY.
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
NOTE 2: INSTALL LINE TEMPERATURE CONTROL IN AN
UNINSULATED TEE BEYOND THE DISHWASHING
MACHINE TAKEOFF IN THE SANITIZING LOOP. CONTROL
SHOULD BE SET AT 185°F (85°C).
NOTE 3: ADJUST PLUG COCK SO THE SANITIZING LOOP FLOW RATE
DOES NOT CAUSE UNNECESSARY TURBULENCE IN THE TANK.
* TEMPERED WATER LOOP, IF USED, CONNECT TO
POINT “A”.
**PIPE RELIEF VALVE TO OPEN DRAIN.
INSTALL IN ACCORDANCE WITH LOCAL CODES.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW
PREVENTER, CHECK VALVE OR WATER METER WITH
CHECK VALVE. PROVISIONS FOR THERMAL EXPANSION OF
WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED.
17
INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE
The discharge opening of the temperature and pressure relief
valve must be piped to an open drain and should not be subject
to freezing conditions. DO NOT REDUCE, BLOCK OR PLUG
THE DISCHARGE OPENING OF THE VALVE.
A listed temperature and pressure relief valve of adequate
capacity is installed on the heater. The locations shown in the
installation diagrams on the following pages are typical.
TWO TEMPERATURE - TWO HEATERS, ONE PRE-HEATER/ONE - BOOSTER HEATER
WITH OR WITHOUT BUILDING RECIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER
SUPPLIED TO FIXTURES.
CIRCULATING RETURN LINE CONNECTIONS
- FROM FIXTURE LOOP, IF USED, CONNECT TO PREHEATER INLET.
- FROM BOOSTED TEMPERATURE LOOP, IF USED CONNECT TO
BOOSTER INLET.
†AVALAIBLE FROM A.O. SMITH.
*PIPE RELIEF VALVE TO OPEN DRAIN.
INSTALL IN ACCORDANCE WITH LOCAL CODES.
18
ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURE
STORAGE WITH OR WITHOUT RECIRCULATION
HEATER WITH OR WITHOUT MIXING VALVE
DANGER
TEMPERATURE SETTING SHOULD NOT
EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER
PREHEAT TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER OUTPUT,
ADD AN ANTI-SCALD VALVE FOR HOT WATER
SUPPLIED TO FIXTURES.
HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOP
NOTE 1:
* PIPE RELIEF VALVE TO OPEN DRAIN.
INSTALL IN ACCORDANCE WITH LOCAL
CODES.
CIRCULATING RETURN LINE CONNECTIONS.
TOGGLE SWITCH CONTROLS 180°F (82°C)
WATER CIRCULATION. INSTALL ON OR CLOSE
TO DISHWASHING MACHINE. TOGGLE SWITCH
MUST BE CLOSED (ON) DURING THE RINSE
OPERATION AND OPEN (OFF) WHEN
DISHWASHER IS NOT OPERATING OR WHEN
ON LONG STANDBY.
- TEMPERED WATER LOOP, IF USED,
CONNECT TO POINT “R”.
- STORED TEMPERATURE WATER
LOOP, IF USED, CONNECT TO COLD WATER
INLET.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW
PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE.
PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.
19
NOTE 2:
INSTALL LINE TEMPERATURE CONTROL
IN AN UNINSULATED TEE BEYOND THE
DISHWASHING MACHINE TAKEOFF IN
THE SANITIZING LOOP. CONTROL
SHOULD BE SET AT 185°F (85°C).
NOTE 3:
ADJUST PLUG COCK SO THE SANITIZING
LOOP FLOW RATE DOES NOT CAUSE
UNNECESSARY TURBULENCE IN THE
TANK.
TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR
BOOSTER HEATER WITH OR WITHOUT BUILDING RECIRCULATION
TWO PRE-HEATERS WITH MIXING VALVE
DANGER
TEMPERATURE SETTING SHOULD NOT
EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 27. IF HIGHER
PREHEAT TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER OUTPUT,
ADD AN ANTI-SCALD VALVE FOR HOT WATER
SUPPLIED TO FIXTURES.
TWO PRE-HEATERS WITH BOOSTER HEATER
20
MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK
FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION
VERTICAL STORAGE TANK
* PIPE RELIEF VALVE TO OPEN DRAIN.
**WHEN USING AN A.O. SMITH T-140, 200,
-350 OR -400 STORAGE TANK, USE
LOWER 3/4” OPENING FOR TANK
TEMPERATURE CONTROL.
IF BUILDING CIRCULATING LOOP IS
USED, CONNECT TO AN OPENING NEAR
THE BOTTOM OF THE TANK.
HORIZONTAL STORAGE TANK
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
BACKFLOW PREVENTER, CHECK VALVE OR WATER
METER WITH CHECK VALVE. PROVISIONS FOR
THERMAL EXPANSION OF WATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.
*PIPE RELIEF VALVE TO OPEN DRAIN
INSTALL IN ACCORDANCE WITH LOCAL CODES.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
USE TEMPERATURE AT FIXTURES. SEE WATER
TEMPERATURE CONTROL WARNING ON PAGE 27. IF
HIGHER PREHEAT TEMPERATURES ARE NECESSARY
TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN
ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO
FIXTURES.
21
MANIFOLD KITS
TWO UNIT MANIFOLD KIT
(PART NO. 195686)
DIMENSIONS “A” INCHES (CM)
MODEL LOW PROFILE VERTICAL HOOD “A”
BTR MODELS
BTRC MODELS
120
69.75” (177cm)
69.75” (177cm)
154
73.00” (185cm)
73.00” (185cm)
180
67.50” (171cm)
70.50” (179cm)
197
75.00 (192cm)
81.50” (207cm)
198
75.00” (192cm)
N/A
199
67.50” (171cm)
70.50” (179cm)
200
72.00” (183cm)
72.00” (183cm)
250
72.00” (183cm)
72.00” (183cm)
251
75.00” (191cm)
75.00” (191cm)
275
72.00” (183cm)
72.00” (183cm)
305
75.00” (191cm)
75.00” (191cm)
365
79.50” (202cm)
75.00” (191cm)
400
75.50” (192cm)
75.50” (192cm)
THREE UNIT MANIFOLD KIT
(PART NO. 195687)
FOUR UNIT MANIFOLD KIT
(PART NO. 195688)
22
MECHANICAL VENTING
TABLE 6
APPROXIMATE TIME REQUIRED TO CONSUME
1 CU. FT. OF GAS AT FULL CAPACITY
SINGLE UNIT INSTALLATION
When mechanical venting of these heaters is desired, the following
kits are available.
Models 120 through the 200/A
A. O. Smith part number 9006015
INPUT
TYPE
BTUH
TIME REQ’D
RATE
OF
PER
TO CONSUME
(BTUH)
GAS
CU. FT.
1 CU. FT.
120,000
NATURAL
1050
31.5 SEC.
PROPANE
2500
75.0 SEC.
NATURAL
1050
24.5 SEC.
OF GAS
Models 250/A through the 400/A
A. O. Smith part number 9006016
154,000
Where an approved power venter is to be installed to operate in
conjunction with the water heater thermostat, the following codes
must be adhered to. Field wiring should conform to the current
edition of the National Electrical Code NFPA 70. For Canadian
installations the electrical connections and grounding shall be
done in accordance with the current Natural Gas and Propane
Installation Code CAN/CSA-B149.1 Part 1 and/or local codes.
180,000
199,000
250,000
VENT INSTALLATION
251,000
Seal all joints between the power venter and the vent termination.
This is to prevent leakage of exhaust products into the room(s)
due to positive pressure of blower.
275,000
The "Sequence of Operation" description will be the same with
mechanical venting except,
305,000
When the appliance thermostat calls for heat:
360,000
Thermostat contacts "Close" and the power venter blower
(120 VAC) is energized. Sufficient draft must be established for
the "Draft Prover Switch (N.O.)" to "Close". When the draft prover
switch "Closes" the relay coil of the flue damper is energized.
365,000
See side wall vent kit installation manual for complete instructions.
390,000
MULTIPLE UNIT INSTALLATIONS
PROPANE
2500
58.4 SEC.
NATURAL
1050
21.1 SEC.
PROPANE
2500
50.3 SEC.
NATURAL
1050
19.0 SEC.
PROPANE
2500
47.4 SEC.
NATURAL
1050
15.1 SEC.
PROPANE
2500
35.3 SEC.
NATURAL
1050
15.06 SEC.
PROPANE
2500
35.1 SEC.
NATURAL
1050
13.75 SEC.
PROPANE
2500
32.2 SEC.
NATURAL
1050
12.4 SEC.
PROPANE
2500
29.5 SEC.
NATURAL
1050
11.4 SEC.
PROPANE
2500
24.0 SEC.
NATURAL
1050
10.4 SEC.
PROPANE
2500
24.7 SEC.
NATURAL
1050
9.5 SEC.
PROPANE
2500
22.6 SEC.
Figures shown are valid for 0-2000 ft.(0-610m) installations. See
“HIGH ALTITUDE INSTALLATIONS” for deration requirements
over 2000 ft.(610m).
For multiple unit installations, contact A.O. Smith Water Products
Company, Technical Support Center at 1-800-527-1953. In
Canada, contact A.O. Smith Enterprises, Ltd. at 1-800-265-8520.
TABLE 7
PILOT BURNER INFORMATION
TABLE 5
MANIFOLD GAS PRESSURE IN INCHES
OF WATER COLUMN (ALL MODELS*)
TYPE OF GAS
NATURAL
PROPANE
3.5
10.0
Gas pressure specified in Table 5, refer to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
23
TYPE OF
PILOT BURNER
RATED
MODEL
GAS
PART NUMBER
ORIFICE
(WITH ORIFICE)
SIZE
ALL
NATURAL
193314-004
0.018
MODELS
PROPANE
193314-003
0.014
PURGING
OPERATION
Gas line purging is required with new piping or systems in which
air has entered.
IMPORTANT
A qualified person must perform the initial firing of the heater. At
this time the user should not hesitate to ask the individual any
questions which they may have in regard to the operation and
maintenance of the unit.
CAUTION
PURGING SHOULD BE PERFORMED BY PERSONS
EXPERIENCED IN THIS TYPE GAS SERVICE. TO AVOID RISK
OF FIRE OR EXPLOSION, PURGE DISCHARGE MUST NOT
ENTER CONFINED AREAS OR SPACES WHERE IGNITION CAN
OCCUR. THE AREA MUST BE WELL VENTILATED AND ALL
SOURCES OF IGNITION MUST BE INACTIVATED OR REMOVED.
An Operational Checklist is included at the rear of this manual.
By using this checklist the user may be able to make minor
operational adjustments and avoid unnecessary service calls.
However, the user should not attempt repairs which are not listed
under the USER column.
WARNING
THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR
AT LEAST 5 MINUTES. This waiting period is an important safety
step. Its purpose is to permit gas that may have accumulated in
the combustion chamber to clear. IF YOU DETECT GAS ODOR
AT THE END OF THIS PERIOD DO NOT PROCEED WITH
LIGHTING. RECOGNIZE THAT GAS EVEN IF IT SEEMS WEAK,
MAY INDICATE PRESENCE OF ACCUMULATED GAS
SOMEPLACE IN THE AREA WITH RISK OF FIRE OR
EXPLOSION. SEE THE FRONT PAGE FOR STEPS TO BE TAKEN.
All gas and water lines leak tested and open.
GENERAL
NEVER OPERATE THE HEATER WITHOUT FIRST BEING
CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE
AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF
VALVE OPENING OF THE HEATER.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE APPLIANCE.
With above conditions satisfied, light the unit in accordance with
the instructions on the Operating label attached to the heater. If
label instructions are not legible - determine which gas valve the
appliance is equipped with and use the applicable OPERATING
INSTRUCTIONS as follows:
CAUTION
Before proceeding with the operation of the unit make sure the
water heater and system are filled with water and all air is
expelled.
IF PILOT FLAME GOES OUT - Main burners will extinguish and
pilot will attempt reignition.
FILLING
DAMPER MUST BE IN FULL OPEN POSITION FOR PILOT AND/
OR MAIN BURNER IGNITION TO OCCUR - See SEQUENCE OF
OPERATION for complete description.
1. Close the heater drain valve by turning handle clockwise.
2. Open a nearby hot water faucet to permit the air in the system
to escape.
Each heater is equipped with a Honeywell Ignition Module. This
module will try to prove pilot for 90 seconds. If pilot is not proven
within the 90 secs, the unit will retry after 5 minutes. This cycle
will continue until pilot is proven.
3. Fully open the cold water inlet pipe valve allowing the heater
and piping to be filled.
If pilot does not ignite when system calls for heat, check for pilot
ignition spark at pilot assembly. Refer to OPERATIONAL
CHECKLIST and EFFIKAL RVGP-KSF SERIES FLUE DAMPER
TROUBLESHOOTING GUIDE.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
24
FOR NATURAL GAS MODELS
25
FOR PROPANE GAS MODELS
26
ADJUSTMENTS
that attach to faucets to limit hot water temperatures. Contact a
licensed plumber or the local plumbing authority.
ON INITIAL STARTUP SOME ADJUSTMENTS ARE NECESSARY.
The water temperature is controlled by a thermostat, Fig. 3, which
has two sensing elements. One sensor is located near the top of
the tank and the other is near the center. The thermostat is set in
the lowest position before the heater leaves the factory.
1. CHECK MANIFOLD AND INLET GAS PRESSURES.
2. TO ADJUST PILOT FLAME - FOLLOW “PILOT BURNER”
PROCEDURE UNDER “PREVENTIVE MAINTENANCE”.
The thermostat temperature dial, Fig. 3, is accessible by
removing the control cover. The dial is adjustable and may be
set for 120°F (49°C) to 180°F (82°C) water temperature, but
120°F (49°C) is the recommended starting point. It is suggested
the dial be placed on the lowest setting which produces an
acceptable hot water supply. This will always give the most
energy efficient operation. The temperature control has a 4°F
fixed differential.
WATER TEMPERATURE CONTROL
TESTING DAMPER OPERATION
With the Service Switch in the AUTOMATIC OPERATION position,
check the operation of the flue damper three (3) times with the
water operating controls for proper operating sequence:
• The damper disc must be open (in the vertical position) before
the ignition and combustion process begins.
WARNING
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT
WATER TEMPERATURES REQUIRED FOR AUTOMATIC
DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS
RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH.
THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH
THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLOWER
RESPONSE TIME OF CHILDREN, AGED OR DISABLED
PERSONS INCREASES THE HAZARDS TO THEM. NEVER
ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR DRAW
THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR
DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.
• The damper disc must be in the open position when the main
burner is firing.
• The gas valve must close and the main burner must have
ceased firing before the damper disc begins its return to the
closed (horizontal) position.
If during testing of the operation of the damper you find that there
is a problem with the operation of the water heater when the
Service Switch is in the AUTOMATIC OPERATION position: Reset
the Service Switch to the HOLD OPEN DAMPER position and
check operation again.
THE WATER HEATER SHOULD BE LOCATED IN AN AREA
WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS
TO SET TEMPERATURES.
If the water heater does operate when placed in the HOLD OPEN
DAMPER position:
SETTING THE WATER HEATER TEMPERATURE AT 120°F WILL
REDUCE THE RISK OF SCALDS. Some states or provinces
require settings at specific lower temperatures.
• Refer
to
the
EFFIKAL
RVGP-FSF-SERIES
TROUBLESHOOTING GUIDE at the end of this manual.
Below you will find listed the approximate time-of-burn relationship
for normal adult skin. Short repeated heating cycles caused by
small hot water uses can cause temperatures at the point of use
to exceed the thermostat setting by up to 20°F (11°C).
CAUTION
Do not force the damper disc manually or motor damage will
occur.
If you experience this type of use, you should consider using lower
temperature settings to reduce scald hazards.
Temperature
Settings
180°F (82°C)
170°F (77°C)
160°F (71°C)
150°F (65°C)
140°F (60°C)
130°F (54°C)
120°F (49°C)
If the water heater does not operate with the Service Switch in
either position:
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
Nearly Instantaneous
Nearly Instantaneous
About 1/2 Second
About 1 - 1/2 Seconds
Less than 5 Seconds
About 30 Seconds
More than 5 Minutes
• Refer to the Troubleshooting Sections and Operational
Checklist sections.
CHECKING VENTING
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while any
other appliances connected to the venting system are not in
operation.
Valves for reducing point-of-use temperature by mixing cold and
hot water are available. Also available are inexpensive devices
1. Seal any unused openings in the venting system.
27
2. Inspect the venting system for proper size and horizontal pitch,
as required in the National Fuel Gas Code, ANSI Z223.1 or
the Natural Gas and Propane Installation Code CAN/CSAB149.1 and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
• The pilot flame should envelop sensing device with 5/8" (1.6cm)
flame, fig. 16. Remove pilot adjustment cover screw, fig. 15.
Turn inner adjustment screw clockwise to decrease, or
counterclockwise to increase pilot flame. Be sure to replace
cover screw on gas valve after adjustment to prevent possible
gas leakage.
3. So far as is practical, close all building doors and windows and
all doors between the space in which the water heater(s)
connected to the venting system are located and other spaces
of the building. Turn on all appliances not connected to the
venting system. Turn on all exhaust fans, such as range hoods
and bathroom exhausts, so they shall operate at maximum
speed. Close fireplace dampers.
2. Clogged pilot burner orifice.
•
Clean or replace orifice. A clogged orifice will restrict
gas flow.
3. Incorrect orifice.
• Replace. See Table 7, for correct orifice for type of gas
used. Orifice size is stamped on the wrench flats.
4. Follow the lighting instruction. Place the water heater being
inspected in operation. Adjust thermostat so appliance shall
operate continuously.
MAIN BURNER
ASSEMBLY
5. Test for draft hood spillage at the relief opening after 5 minutes
of main burner operation.
PILOT BURNER
ASSEMBLY
6. After it has been determined that each appliance connected to
the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, fireplace dampers
and any other gas burning appliance to their previous
conditions of use.
7. If improper venting is observed during any of the above tests,
the venting system must be corrected.
WARNING
FIGURE 14
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS.
Pilot sensing device must sense a flame before sparking will stop.
Loose wires or a draft may cause intermittent or abnormal
sparking. To eliminate this condition, first correct loose wiring
condition, and then, if necessary, increase pilot flame.
• If the back draft cannot be corrected by the normal method or
if a suitable draft cannot be obtained, a blower type flue gas
exhauster must be employed to assure proper venting and
correct combustion.
PILOT BURNER ASSEMBLY
PREVENTIVE MAINTENANCE
CHECK THE PILOT
At least once a year, check the pilot burner, fig. 15, and the main
burner, fig. 16, for proper operation. Refer to the following pilot
and main burner sections.
PILOT BURNER
For access to pilot, unfasten two screws to burner cover and
remove. Locate the burner with pilot and remove screw holding
burner to manifold. Unfasten pilot tubing from valve and slide out
burner and pilot.
FIGURE 15
MAIN BURNER
Servicing of the pilot burner includes keeping pilot free of lint,
cleaning the burner head, the primary air opening and the orifice
of the pilot burner.
The main burner, fig. 16, should display the following
characteristics:
Pilot burner flame is affected by:
• Cause rapid ignition and carry over of flame across entire
burner.
1. Low gas pressure.
• Give reasonably quiet operation during ignition, burning and
extinction.
• Adjust pilot flame by means of the pilot gas adjustment
located on the gas valve. See fig. 17.
• Cause no excessive lifting of flame from burner ports.
28
TYPICAL PILOT AND MAIN BURNER FLAMES
If the gas valve becomes defective, repairs should not be
attempted. A new valve should be installed in place of the defective
one.
CHECKING THE INPUT
For appliance installation locations with elevations above 2000
feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section
of this manual for input reduction procedure.
FIGURE 16
1. Attach a pressure gauge or a manometer to the gauge port
and refer to Table 5, for correct manifold pressure.
If the preceding burner characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or other
foreign material that restricts or blocks the air openings to the
burner or heater.
2. Use this formula to “clock” the meter. Be sure that other gas
consuming appliances are not operating during this interval.
NOTE: Cleaning of main burners.
3600 X H = Btuh
T
1. Remove main burners from unit.
2. Check that burner venturi and ports are free of foreign matter.
T = Time in seconds to burn one cubic foot of gas.
3. Clean burners with bristle brush and/or vacuum cleaner —
DO NOT distort burner ports or pilot location.
H = Btu’s per cubic foot of gas.
4. Reinstall burners in unit. Make sure front and rear of burners
are installed correctly in burner support brackets.
Btuh = Actual heater input.
Also check for good flow of combustion and ventilating air to the
unit. Maintain a clear area around the heater at all times.
Example: (Using BTRC-199 heater)
T = 15.8 seconds
GAS VALVES
H = 1050 Btu
Btuh = ?
Figure 17 shows the two types of combination gas control valves
used on these heaters.
19.0 X 1050 = 199,000 Btuh (70.3 Kwh) (Compare with
15.9 heater model and rating)
Should it be necessary to adjust the gas pressure to the burners
to obtain the full input rate, the steps below should be followed:
3. Remove the regulator adjustment sealing cap, fig. 17, and
adjust the pressure by turning the adjusting screw with a
screwdriver.
Clockwise to increase gas pressure and input rate.
Counterclockwise to decrease gas pressure and input
LP VALVE
rate.
4. “Clock” the meter as in step 2 above.
5. Repeat steps 3 and 4 until the specified input rate is achieved.
6. Turn the gas control knob to PILOT. Remove the pressure
gauge and replace the sealing cap and the allen wrench set
screw in the pressure tap opening.
WARNING
UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT
EXCEED THE INPUT SHOWN ON THE HEATER MODEL AND
RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE
OR SOOTING OF THE HEATER.
NATURAL VALVE
When the heater is operating at full capacity, or full gas input, it
should consume 1 cu. ft. of gas in time indicated on Table 6.
FIGURE 17
29
the factory installed magnesium anodes with aluminum anodes
may correct the condition.
VENTING SYSTEM
Examine the venting system every six months for obstructions
and/or deterioration of the vent piping.
Occasionally water softener companies recommend removal of
heater anodes for odor reasons.
Remove all soot or other obstructions from chimney which will
retard free draft.
CAUTION
Unauthorized removal of the anode(s) will void the warranty. For
further information contact your dealer.
REMOTE STORAGE TANK
TEMPERATURE CONTROL
ANODE ROD INSPECTION
The water temperature in the storage tank (if used) is controlled
by the storage tank temperature control. The sensing element is
mounted in the hot water storage tank, see page 16.
The heater tank is equipped with anode rods to provide corrosion
control. At least once a year the anode rods should be checked
to determine if replacement is necessary. Initially the anode rods
are approximately 7/8" (22mm) in diameter with a 1/8" (3mm)
diameter steel core wire running down the center of the anode
material. THE ANODES SHOULD BE REPLACED when the 1/8"
(3mm) diameter core wire is visible as this means that the anode
material has been expended in the control of corrosion.
A change in water temperature in the storage tank lower than the
tank temperature control setting will cause the sensor to activate
the circulating pump. The pump then circulates the water through
the heater where the thermostat senses the drop in water
temperature and activates main burner operation of the appliance.
If the storage tank temperature control is out of calibration, replace
with new control.
For models with top inlet and outlet, it is recommended that,
before removing the inner cover for cleaning, inspection or
removal of inner parts, you obtain two new nipple collars, part
no. 74060. The nipple collars on the heater will usually be
damaged when removed. New pipe collars will insure that the
seal is such as to prevent leakage of flue products when properly
installed.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE APPLIANCE.
RELIEF VALVE
NOTE: Anode rod inspection may need to be made more
frequently in areas subject to acid rain that obtains their water
supply from surface water as the low pH will accelerate anode
activity.
At least once a year, the temperature and pressure relief valve
should be checked to ensure that it is in operating condition. Lift
the lever at the top of the valve several times until the valve seats
properly and operates freely.
CAUTION: Close cold water inlet valve serving heater and
open nearby hot water faucet to relieve the pressure in the
heater before attempting to remove anode(s) for inspection.
If the appliance installation includes other relief valves, such as
in “remote” storage tanks etc., check their relief valve operation
with the same frequency.
WARNING
RECOMMENDED PROCEDURE FOR
PERIODIC REMOVAL OF LIME DEPOSITS
FROM TANK TYPE COMMERCIAL WATER
HEATERS
THE WATER PASSING OUT OF THE VALVE DURING THIS
CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID
CONTACT AND DISCHARGE SAFELY TO PREVENT WATER
DAMAGE.
If the temperature and pressure relief valve on the heater
discharges periodically or continuously, a problem exists. This
may be due to unusually high water temperatures or pressures in
the system, or to a faulty relief valve. Contact your dealer or a
qualified service technician to find the cause of the problem and
to correct it. This may also be due to thermal expansion in a
closed water supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation. DO NOT
PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.
The amount of calcium carbonate (lime) released from water is in
direct proportion to water temperature and usage, see chart. The
higher the water temperature or water usage, the more lime
deposits are dropped out of the water. This is the lime scale
which forms in pipes, heaters and on cooking utensils.
Lime accumulation not only reduces the life of the equipment but
also reduces efficiency of the heater and increases fuel
consumption.
The usage of water softening equipment greatly reduces the
hardness of the water. However, this equipment does not always
remove all of the hardness (lime). For this reason it is
recommended that a regular schedule for deliming be
maintained.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE APPLIANCE.
HOT WATER ODOR
The time between cleaning will vary from weeks to months
depending upon water conditions and usage.
On occasion, hot water may develop a strong odor. If this occurs
drain the heater completely, flush thoroughly, and refill. If the
problem persists, chlorination of the heater and replacement of
Refer to A. O. Smith booklet, Form No. 4800, entitled “Why?
When and How” for detailed description on tank inspection and
30
cleanout. UN•LIME® and the booklet may be obtained through
your A. O. Smith dealer or distributor.
3. Remove six (6) hex head screws securing tank cleanout plate
and remove plate.
4. Remove lime, scale, or sediment using care not to damage
the glass lining.
5. Inspect cleanout plate gasket, if new gasket is required, replace
with A. O. Smith part no. 99038.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Replace outer jacket cover plate.
FIGURE 18
DELIMING SOLVENTS
A. O. Smith recommends the use of UN•LIME for deliming.
UN•LIME is a patented food grade acid which is safe to handle
and does not create the harmful fumes which are associated with
other products.
UN•LIME may be obtained from your dealer, distributor or the
A. O. Smith Product Service Division. Order part no. 4763 (1 gal),
packed 4 gallons per case or part no. 4813 (5 gallon container).
FIGURE 19
In some water areas the sediment might not be removed by this
method and may result in the water heater making rumbling or
boiling noises. To dissolve and remove these more stubborn
mineral deposits, A. O. Smith UN•LIME Professional Delimer
should be used.
Hydrochloric base acids are not recommended for use on glasslined tanks.
CAUTION
Observe handling instructions on label of product being used.
DELIMING USING FLO-JUG METHOD
UN•LIME in the 5 gallon size is recommended for deliming of the
BTR(C)120-500 models. UN•LIME with the necessary hoses and
fittings to delime your heater is also available as a kit: Up-N-Down
Transfer Kit. Contact your local A.O. Smith dealer, distributor or,
A.O. Smith Water Products Company:
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit
to operate at its designed efficiency:
Telephone: (800) 433-2545
Fax: (800) 433-2515
Website: www.hotwater.com
1. Once a month the heater should be flushed. Open the drain
valve and allow two gallons of water to drain from the heater.
Inlet water valve should remain open to maintain pressure in
tank.
Prepare the Water Heater
To delime the water heater using the Flo-Jug method, first prepare
the heater for deliming as described in the "Why? When? and
How?" booklet, Form No. 4800. Then install the long plastic male
adapter fitting into the drain valve opening of the water heater.
Use teflon tape and hand tighten only. Do not overtighten.
2. A cleanout opening is provided for periodic cleaning of the
tank. Gas must be shut off and heater drained before opening
cleanout.
To clean heater through cleanout opening, proceed as follows:
Prepare the Up-N-Down Transfer Kit
The next step is the preparation on the Up-N-Down Transfer Kit,
if you have not already done so:
1. Drain heater.
2. Remove outer cover plate from lower side of heater jacket.
31
1. With the 5 gallon Up-N-Down container in the vertical position,
unscrew the plastic vent cap in the handle and pierce the plastic
membrane over the vent boss under the cap to allow the
container to vent.
— Check that “main manual gas shut-off valve” is fully open and
that gas service has not been interrupted.
— Check that after following the appliance OPERATING
INSTRUCTIONS, the “Top Knob” of the appliance gas valve is
in “ON” position.
Note: If your container does not have the vent cap and vent
boss, drill a 3/16" hole in the handle. When you have finished
deliming you will be able to plug this drilled vent with the
stainless steel screw that is supplied with the kit.
— Check electrical supply to the appliance for possible blown (or
tripped) fusing or power interruption.
2. Remove the container's cap and cut the plastic membrane
located in the 3/4" IPT opening in the cap. Take care to not
damage the threads.
— Is the water temperature in tank below the thermostat dial
setting on the appliance thermostat (calling for heat)?
— It is possible that the high limit (E.C.O.) has functioned to shut
off the appliance. See FEATURES — Water Temperature
Control for reset procedure. Contact your serviceman if limit
continues to function to shut off appliance.
3. Find the 3/4" male adapter, apply teflon tape to the threaded
end and screw it into the 3/4" IPT opening in the cap.
4. Put cap with male adapter back on the container and slide
3/4" hose over end of male adapter and fasten in place using
hose clamp provided.
SERVICE
Delime using Flo-Jug Method
5. Slide the hose clamp over end of hose and slide hose over the
male adapter in the water heater drain opening and secure in
place using hose clamp.
The installer may be able to observe and correct certain problems
which may arise when the unit is put into operation. HOWEVER,
it is recommended that only qualified servicemen, using
appropriate test equipment, be allowed to service the heater.
6. Lift container to the "Pour" Position, see Figure 19, being careful
to keep the vent in the handle above the liquid level and pour
the UN•LIME into the heater.
As preliminary step, check wiring against diagram, check for
grounded, broken or loose wires. Check all wire ends to be sure
that they are making good contact.
7. Lower container, you may have to place the container on its empty
carton to prevent the UN•LIME from flowing back into the container.
ELECTRICAL SERVICING
8. Let UN•LIME remain in the heater for 5 minutes and then lower
the container to the "Drain" Position, see Figure 19.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
9. Deliming activity is indicated by foaming on the surface of the
UN•LIME. If there is deliming activity, repeat steps 6 thru 8.
Normally, lime removal will be completed within one hour. Severe
build-up of lime may take longer than an hour to complete
descaling.
VERIFY PROPER OPERATION AFTER SERVICING.
REPLACEMENT PARTS
Note: To check UN•LIME for continued use, place some scale or
white chalk in a glass with a small amount of UN•LIME. If the
material is vigorously dissolved by the UN•LIME, it can be reused;
if not, the UN•LIME should be replaced.
Replacement parts may be ordered through A.O. Smith dealers,
authorized servicers or distributors. Refer to the Yellow Pages
for where to call or contact A.O. Smith Water Heater Parts
Fulfillment, 125 Southeast Parkway, Franklin, TN 37068 at
1-800-433-2545 or www.hotwater.com. For Canada contact: A.O.
Smith Enterprises Ltd., P.O. Box 310, 768 Erie Street, Stratford,
Ontario, Canada N5A 6T3, 1-800-265-8520. When ordering parts
be sure to state the quantity, part number and description of the
item(s) including the complete model and serial number as it
appears on the product. Refer to the part’s list for more
information.
TROUBLESHOOTING
IGNITION MODULE SYSTEM
Before calling your service agent, the following checklist should
be examined to eliminate obvious problems from those requiring
replacement or servicing.
32
EFFIKAL RVGP-KSF-SERIES FLUE DAMPER TROUBLE SHOOTING GUIDE
Do not turn damper open manually or motor damage will result, use the service switch.
All readings are taken from harness receptacle. Do not push meter leads into harness receptacle.
This opens the pins and will create connection problems.
Effikal Pinouts
& wire colors
1. Brown
2. Orange
3. Yellow
4. Black
PIN END VIEW
Adapter wire
colors in*
Black
Yellow
Red
White
*See Connection Diagram, Figure 14.
NOTE: DAMPER DISC SHOWN IN OPEN POSITION.
24 V.A.C.
Function
24 VAC HOT
Signal In
Signal Out
24 VAC Common
NORMAL SEQUENCE OF OPERATION
A. FLUE DAMPER OPEN OR OPENING
(Unit is calling for heat and damper disc should be in vertical position)
WARNING
VOLTAGE ACROSS:
Do not negate the action
4&1
All Times that High Limit is closed
of any existing safety
4&2
Calling for Heat
Open or Opening
or operational controls.
4&3
During Combustion
Damper Open+
B. FLUE DAMPER CLOSED (Unit is not calling for heat and damper disc should be in horizontal position)
NOTE: POSITION 4 IS COMMON AND POSITION 3 IS HOT 24VAC
VOLTAGE ACROSS:
4&1
All Times that High Limit is closed
NO VOLTAGE ACROSS:
4 & 3 or 4 & 2
1.Thermostat not calling for heat.
ABNORMAL OPERATION
A. NOTHING WORKING
NO VOLTAGE ACROSS:
4&1
1. High Limit has tripped and is OPEN. Determine reason for tripping of high limit
2. Bad Transformer
3. Loose or broken connections
4. Blown fuse or circuit breaker
5. Disconnect switch off
6. Harness not plugged into appliance receptacle
B. DAMPER HAS OPENED,
NO COMBUSTION
VOLTAGE ACROSS:
4 & 1; 4 & 2; 4 & 3:
1. Check for power at ignition module terminals. If 24VAC power is present damper
is working properly.
2. Defective component in appliance after the flue damper.
3. If 24 VAC is not present at the ignition module, look for loose or broken
connections between damper and ignition module.
4. If the connections from damper to ignition module seem proper, replace damper
assembly. If a damper assembly is not available, place the service switch in the
hold open position. This should keep the damper in the open position and allow
the customer to have automatic heat, until a replacement damper can be installed.
C. DAMPER ROTATES
CONTINUOUSLY
D. DAMPER STICKS
Change the entire damper assembly
1. Make sure no screws obstruct the damper blade.
2. Make sure damper pipe assembly is not egg shaped.
3. Make sure damper rod is not rubbing on pipe assembly.
See figure on front page of this insert sheet
IMPORTANT: DAMPER MUST BE OPEN BEFORE COMBUSTION TAKES PLACE. If all steps have been
tried and damper problems persists call A.O. Smith Technical Center at 1-800-527-1953.
33
OPERATIONAL CHECKLIST
This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job
troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper
piping and wiring can result in unsatisfactory system performance, it is suggested that the installation by examined before using the
checklist. Be sure to refer to the correct piping and wiring diagram for the type of system that is installed.
COMPLAINT
*Water not hot enough.
*Insufficient hot water
*See WATER TEMPERATURE
WARNING (on page 27)
Water temperature too hot.
Heater makes sounds: sizzling.
Rumbling.
Ticking or metallic sounds.
Pounding.
Combustion noises.
Water leaks.
Gas odors.
CAUSE
Thermostat set too low.
USER
Set thermostat dial to
a higher temperature.
Thermostat out of calibration. Call serviceman.
Set thermostat dial to a
higher temperature.
Thermostat out of calibration. Call serviceman.
REMEDY
SERVICE MAN
Recalibrate thermostat.
If thermostat cannot be
recalibrated, replace.
Thermostat set too low.
Recalibrate thermostat. If
thermostat cannot be recalibrated,
replace.
Main manual gas shutoff
Open main manual gas
valve partially closed.
shutoff valve to fullest extent.
Heater too small for demand. Space usage to give heater
time to restore water
temperature.
Thermostat differential is
Call serviceman.
Replace dual bulb controller if
too wide.
differential is greater than 4°F.
Heater recovery is slower.
Call serviceman.
Check gas input. If incorrect,
adjust gas pressure or replace
main burner orifice.
Draft hood not installed or
Call serviceman.
Install draft hood or baffles as
one or more flue baffles.
furnished with unit.
Thermostat set too high.
Set thermostat to a
lower setting.
Condensation on outside of
tank - normal.
Sediment accumulation on
Drain a quantity of water
bottom of tank.
through drain valve. If
Delime heater.
rumbling persists, call
a serviceman.
Expansion and contractionnormal.
Air chambers in piping have Drain piping system and
become waterlogged.
refill. Heater must be off
while this is being done.
Too much primary air.
Adjust shutters.
Overfired heater. Incorrect
burners or orifice for types
Call serviceman.
Check and correct as necessary.
of gas used.
Drain valve not closed tightly. If drain valve cannot be
closed tightly, replace.
If leakage source cannot be Shut off gas supply to heater Repair or in case of suspected
corrected or identified, call
and close cold water inlet
tank leakage, be certain to confirm
serviceman.
valve to heater.
before replacing heater.
Heater is overfired.
Shut off gas supply to
Check for sooted flue passage.
heater and call serviceman. Check for obstructed vent line.
Check backdraft or lack of draft.
Draft hood may be improperly
installed or not sized properly.
Possible gas leaks.
Shut off gas supply to
heater and call gas
company at once.
34
Model BTR(C) Limited Warranty
A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.
1. THE TANK
If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable
water therein, during the first THREE years after initial installation, the warrantor will supply a complete new A. O. Smith water heater of equivalent size and current model. Some government agencies are requiring energy efficient standards for water heaters. In the event regulations
prohibit sale of a model of equivalent size and construction, A. O. Smith will provide a model which complies with the regulations of your area, in
which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required. The
warranty on the replacement water heater will be limited to the unexpired term of the original warranty.
2. ALL OTHER PARTS
If within ONE year after initial installation of this water heater, any part or portion shall prove upon examination by the warrantor to be defective in
material or workmanship, the warrantor will repair or replace such part or portion at its option.
3. CONDITIONS AND EXCEPTIONS
This warranty shall apply only when the water heater is installed in accordance with local plumbing and building codes, ordinances and regulations, the printed instructions provided with it and good industry practices. In addition, a temperature and pressure relief valve, certified by
A.G.A./CGA and approved by the American Society of Mechanical Engineers, must have been installed.
a. This warranty shall apply only when the heater is:
(1)
used at temperatures not exceeding the maximum calibrated setting of its thermostat;
(2)
used at water pressure not exceeding the working pressure shown on the heater;
(3)
filled with potable water, free to circulate at all times and with the tank free of damaging water sediment or scale deposits;
(4)
used in a non-corrosive and non-contaminated atmosphere;
(5)
used with factory approved anode(s) installed;
(6)
in its original installation location;
(7)
in the United States, its territories or possessions, and Canada;
(8)
sized in accordance with proper sizing techniques for commercial and/or residential water heaters;
(9)
bearing a rating plate which has not been altered, defaced or removed, except as required by the warrantor;
(10)
used in an open system or in a closed system with properly sized and installed thermal expansion tank;
(11)
operated with properly installed dirt leg;
(12)
fired with the fuel for which it was factory built;
(13)
fired at the factory rated input;
(14)
operated with the inner and outer combustion chamber doors in place.
b. Any accident to the water heater, any misuse, abuse (including freezing) or alteration of it, any operation of it in a modified form, any use of
insulation blankets, or any attempt to repair tank leaks will void this warranty.
c. This warranty is void if a device acting as a backflow prevention device (check valves etc.) is installed in the cold water supply the heater is
connected to, unless an effective method of controlling thermal expansion is also installed at the heater(s) and operational at all times. The
relief valve installed on the heater is not an acceptable method.
4. SERVICE AND REPAIR EXPENSES
Under the limited warranty the warrantor will provide only a replacement water heater or part thereof. The owner is responsible for all other costs.
Such costs may include but are not limited to:
a. Labor charges for service removal, repair or reinstallation of the water heater or any component part;
b. Shipping, delivery, handling, and administrative charges for forwarding the new heater or replacement part from the nearest distributor and
returning the claimed defective heater or part to such distributor.
c. All cost necessary or incidental for any material and/or permits required for installation of the replacement heater or part.
5. LIMITATIONS ON IMPLIED WARRANTIES
Implied warranties, including the warranty of merchantability imposed on the sale of this heater under state or provincial law are limited to one (1)
year duration for the heater or any of its parts. Some states and provinces do not allow limitation on how long an implied warranty lasts, so the
above limitation may not apply to you.
6. CLAIM PROCEDURE
Any claim under the warranty should be initiated with the dealer who sold the heater, or with any other dealer handling the warrantor’s products.
If this is not practicable, the owner should contact:
U.S. Customers
Canadian Customers
A. O. Smith Water Products Company
A. O. Smith Enterprises Ltd.
500 Tennessee Waltz Parkway
P. O. Box, 310 - 768 Erie Street
Ashland City, TN 37015
Stratford, Ontario N5A 6T3
Telephone: 1-800-323-2636
Telephone: 1-800-265-8520
a. The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or distributed by the warrantor.
b. Dealer replacements are made subject to in-warranty validation by warrantor.
7. DISCLAIMERS
NO OTHER EXPRESS WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF OF THE WARRANTOR WITH RESPECT TO THE MERCHANTABILITY
OF THE HEATER OR THE INSTALLATION, OPERATION, REPAIR OR REPLACEMENT OF THE HEATER. THE WARRANTOR SHALL NOT BE
RESPONSIBLE FOR WATER DAMAGE, LOSS OF USE OF THE UNIT, INCONVENIENCE, LOSS OR DAMAGE TO PERSONAL PROPERTY OR OTHER
CONSEQUENTIAL DAMAGE. THE WARRANTOR SHALL NOT BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR DAMAGE TO ANY
PERSONS OR PROPERTY, WHETHER DIRECT OR INDIRECT, AND WHETHER ARISING IN CONTRACT OR IN TORT.
a. Some states or provinces do not allow the exclusion or limitation of the incidental or consequential damage, so the above limitations or
exclusions may not apply to you.
b. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state or province to province.
Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and serial number are found on the
heater’s rating plate.
Model No.
Serial No. ___________________________________
Date Installed_________________
Dealer’s
Name______________________________________________________________________________________________________________
Dealer’s Address _______________________________________________________________ Phone No.___________________________
City and State/Province___________________________________________________Zip/PostalCode_________________________________
KEEP THIS WARRANTY POSTED ADJACENT TO THE HEATER FOR FUTURE REFERENCE
35
500 Tennessee Waltz Parkway, Ashland City, TN 37015
Phone: 800-527-1953 Fax: 800-433-2515
www.hotwater.com
36
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