30
Gas Supply Piping
When measuring the inlet supply pressure, the water heater and all other gas appliances sharing the gas supply
line must be
ring at maximum capacity.
Maximum gas pressure must not exceed listed value.
Low gas pressure could be caused by an undersized gas pipe; this will cause the water heater's performance to
diminish and it would not be able to reach maximum performance.
These tables are for reference only. Please consult the gas pipe manufacturer for actual pipe capacity.
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Size gas piping system correctly following ANSI Z223.1/NFPA 54, or by local code.
Based on 0.60 specific gravity for natural gas at 0.5" W.C. pressure drop. DOE standard is 1000 BTU per cubic ft. of natural gas
Based on 1.50 specific gravity for propane gas at 0.5" W.C. pressure drop; 11" W.C. supply pressure
Gas Piping System Codes
NATURAL GAS SUPPLY PIPING
PROPANE GAS SUPPLY PIPING
Pipe
Cubic Feet of Natural Gas
size
Length
10
’
20
’
30
’
40
’
50
’
60
’
70
’
80
’
90
’
100
’
125
’
150
’
200
’
1/2"
172
118
95
81
72
65
60
56
52
50
44
40
34
3/4"
360
247
199
170
151
137
126
117
110
104
92
83
71
1"
678
466
374
320
284
257
237
220
207
195
173
157
134
1 1/4"
1390
967
768
657
583
528
486
452
424
400
355
322
275
1 1/2"
2090
1430
1150
985
873
791
728
677
635
600
532
482
412
2"
4020
2760
2220
1900
1680
1520
1400
1300
1220
1160
1020
928
794
Pipe
KBTU of Propane Gas
size
Length
10
’
20
’
30
’
40
’
50
’
60
’
80
’
100
’
125
’
150
’
175'
200
’
1/2"
291
200
160
137
122
110
101
94
89
84
74
67
3/4"
608
418
336
287
255
231
212
197
185
175
155
140
1"
1150
787
632
541
480
434
400
372
349
330
292
265
1 1/4"
2350
1620
1300
1110
985
892
821
763
716
677
600
543
1 1/2"
3520
2420
1940
1660
1480
1340
1230
1140
1070
1010
899
814
2"
6790
4660
3750
3210
2840
2570
2370
2200
2070
1950
1730
1570
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Based on 0.60 specific gravity for natural gas at 3.0" W.C. pressure drop;
8.0" W.C. or greater supply pressure
. DOE standard
is 1000 BTU per cubic ft. of natural gas
NATURAL GAS SUPPLY PIPING
Pipe
Cubic Feet of Natural Gas
size
Length
10
’
20
’
30
’
40
’
50
’
60
’
70
’
80
’
90
’
100
’
125
’
150
’
200
’
1/2"
454
312
250
214
190
172
158
147
138
131
116
105
90
3/4"
949
552
524
448
397
360
331
308
280
273
242
219
188
1"
1787
1228
986
844
748
678
624
580
544
514
456
413
353
1 1/4"
3669
2522
2025
1733
1536
1392
1280
1191
1118
1056
936
848
726
1 1/2"
5497
3778
3034
2597
2302
2085
1919
1785
1675
1582
1402
1270
1087
2"
10588
7277
5844
5001
4433
4016
3695
3437
3225
3046
2700
2446
2094
This unit needs a manual gas control valve (shut-off valve) that must be connected to the unit before the gas
line.
Check the gas inlet pressure and the type of gas matching the rating plate located on your water heater. Also
check to make sure your gas meter is capable of supplying suf
cient BTU load to all appliances. Insuf
cient
gas pressure and volume will cause your water heater to be deficient in performance and may not work
properly.
When connections are completed, check for gas leaks by applying soapy water to all gas fittings and
connections. Presence of soap bubbles foaming is a sign of gas leaks.
This appliance and its individual shut-off valve must be isolated from the gas supply piping system by
unplugging the unit and turning off the main gas valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSI.
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NOTE
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Summary of Contents for GU145 (S)
Page 5: ...5 Dimensions GU145 S 508 11 12 21 22 1145 S GU195 S M 508 11 12 21 22 1195 S M ...
Page 6: ...6 Parts Diagram for Model GU145 S 508 11 12 21 22 1145 S GU195 S M 508 11 12 21 22 1195 S M ...
Page 7: ...7 Parts Diagram for Model GU145 S 508 11 12 21 22 1145 S ...
Page 56: ...56 Wiring and Connection Diagram Wiring Diagram MODEL GU195 M 508 11 12 21 22 1195 M ...