A.O. Smith DB/DW-720-1810 User Manual page 4

Natural gas-fired commercial cross flow copper boilers for hydronic heating and hot water supply
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Your Dura-Max boiler is not designed to operate with a boiler inlet water temperature of less than
100°F (38°C). Colder inlet water temperatures will result in significant condensation developing on
the heat exchanger. This situation can cause a corrosive environment for the heat exchanger,
burners and venting resulting in premature damage, which could result in serious personal injury or
death.
For systems that use large volumes of cold water or system utilizing heavy water draws (Cer-Temp),
condensation can be prevented by using a by-pass loop. See page 16.
TABLE 3, RECOVERY CAPACITIES
INPUT
F
MODEL
BTUH
KW
C
720,000
GPH
DB/DW-720
211
LPH
840,000
GPH
DB/DW-840
246
LPH
960,000
GPH
DB/DW-960
281
LPH
1,080,000
GPH
DB/DW-1080
316
LPH
1,210,000
GPH
DB/DW-1210
354
LPH
1,350,000
GPH
DB/DW-1350
395
LPH
1,480,000
GPH
DB/DW-1480
433
LPH
1,610,000
GPH
DB/DW-1610
472
LPH
1,810,000
GPH
DB/DW-1810
530
LPH
TABLE 2, PRESSURE DROP
Temp Rise
Model
F
20
DW-720
30
40
20
DW-840
30
40
20
DW-960
30
40
20
DW-1080
30
40
20
DW-1210
30
40
20
DW-1350
30
40
20
DW-1480
30
40
20
DW-1610
30
40
20
DW-1810
30
40
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
20F
30F
36F
40F
50F
11.1C 16.6C
20C
22.2C 27.7C
3,535
2,356
1,964
1,767
1,414
13,379 8,920
7,433
6,690
5,352
4,124
2,749
2,291
2,062
1,649
15,609 10,406 8,672
7,805
6,244
4,713
3,142
2,618
2,356
1,885
17,839 11,893 9,911
8,920
7,136
5,367
3,578
2,982
2,684
2,147
20,317 13,545 11,287 10,158 8,127
6,013
4,009
3,341
3,007
2,405
22,762 15,175 12,646 11,381 9,105
6,709
4,473
3,727
3,355
2,684
25,396 16,931 14,109 12,698 10,158 9,406
7,176
4,784
3,987
3,588
2,870
27,162 18,108 15,090 13,581 10,865 10,060 9,054
7,806
5,204
4,337
3,903
3,122
29,548 19,699 16,416 14,774 11,819 10,944 9,849
8,776
5,851
4,875
4,388
3,510
33,219 22,146 18,455 16,609 13,288 12,303 11,073 9,491
WARNING
Flow Rate
HdLoss*
C
GPM LPM
ft
11.1
59
223
3.5
16.7
39
149
1.7
22.2
29
111
1.0
11.1
69
260
4.8
16.7
46
173
2.1
22.2
34
130
1.5
11.1
79
297
6.8
16.7
52
198
3.3
22.2
39
149
1.9
11.1
89
339
4.5
16.7
60
226
2.1
22.2
45
169
1.4
11.1
100
379
5.3
16.7
67
253
2.7
22.2
50
190
1.6
11.1
112
423
6.8
16.7
75
282
3.2
22.2
56
212
1.8
11.1
120
453
7.9
16.7
80
302
3.9
22.2
60
226
2.1
11.1
130
492
9.5
16.7
87
328
5.0
22.2
65
246
3.0
11.1
146
554 12.0 3.7
16.7
98
369
6.2
22.2
73
277
3.9
54F
60F
70F
72F
80F
30C
33.3C 38.8C
40C
44.4C
1,309
1,178
1,010
982
884
4,955
4,460
3,823
3,716
3,345
1,527
1,375
1,178
1,145
1,031
5,781
5,203
4,460
4,336
3,902
1,745
1,571
1,346
1,309
1,178
6,607
5,946
5,097
4,955
4,460
1,988
1,789
1,534
1,491
1,342
7,525
6,772
5,805
5,644
5,079
2,227
2,004
1,718
1,670
1,503
8,430
7,587
6,504
6,323
5,691
2,485
2,236
1,917
1,864
1,677
8,465
7,256
7,054
6,349
2,658
2,392
2,050
1,993
1,794
7,761
7,545
6,791
2,891
2,602
2,230
2,168
1,952
8,442
8,208
7,387
3,250
2,925
2,507
2,438
2,194
9,227
8,305
4
M
1.1
0.5
0.3
1.5
0.6
0.5
2.1
1.0
0.6
1.4
0.6
0.4
1.6
0.8
0.5
2.1
1.0
0.5
2.4
1.2
0.6
2.9
1.5
0.9
1.9
1.2
90F
100F
108F
110F
120F
50C
55.5C
60C
61.1C 66.6C
785
707
655
643
589
2,973
2,676
2,478
2,433
2,230
916
825
764
750
687
3,469
3,122
2,891
2,838
2,602
1,047
943
873
857
785
3,964
3,568
3,304
3,243
2,973
1,193
1,073
994
976
895
4,515
4,063
3,762
3,694
3,386
1,336
1,203
1,114
1,093
1,002
5,058
4,552
4,215
4,139
3,794
1,491
1,342
1,242
1,220
1,118
5,644
5,079
4,703
4,617
4,233
1,595
1,435
1,329
1,305
1,196
6,036
5,432
5,030
4,939
4,527
1,735
1,561
1,446
1,419
1,301
6,566
5,910
5,472
5,372
4,925
1,950
1,755
1,625
1,596
1,463
7,382
6,644
6,152
6,040
5,536
126F
130F
140F
70C
72.2C 77.7C
561
544
505
2,124
2,058
1,911
655
634
589
2,478
2,401
2,230
748
725
673
2,832
2,744
2,548
852
826
767
3,225
3,126
2,902
954
925
859
3,613
3,502
3,252
1,065
1,032
958
4,031
3,907
3,628
1,139
1,104
1,025
4,311
4,179
3,880
1,239
1,201
1,115
4,690
4,546
4,221
1,393
1,350
1,254
5,273
5,111
4,746

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