Water Heater Innovations 196284-001 User Manual
Page 8
8
Size the main gas line in accordance with Table 1. 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 latest version of the National
Fuel Gas Code.
TABLE 1 - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
LENGTH
IN
FEET
1/2"
3/4"
1"
1 1/4" 1 1/2"
2"
2 1/2"
3"
4"
10
175
360 680
1400 2100 3960
6300 11000 23000
20
120
250 465
950
1460 2750
4360
7700 15800
30
97
200 375
770
1180 2200
3520
6250 12800
40
82
170 320
660
990
1900
3000
5300 10900
50
73
151 285
580
900
1680
2650
4750
9700
60
66
138 260
530
810
1520
2400
4300
8800
70
61
125 240
490
750
1400
2250
3900
8100
80
57
118 220
460
690
1300
2050
3700
7500
90
53
110 205
430
650
1220
1950
3450
7200
100
50
103 195
400
620
1150
1850
3250
6700
125
44
93
175
360
550
1020
1650
2950
6000
150
40
84
160
325
500
950
1500
2650
5500
175
37
77
145
300
460
850
1370
2450
5000
200
35
72
135
280
430
800
1280
2280
4600
LENGTH
IN
METERS 1/2"
3/4"
1"
1 1/4" 1 1/2"
2"
2 1/2"
3"
4"
3
51
105 199
410
615
1160
1845
3221
6735
6
35
73
142
278
428
805
1277
2255
4626
9
28
59
110
225
346
644
1031
1830
3748
12
24
50
94
193
290
556
878
1552
3192
15
21
44
83
170
264
492
776
1391
2840
18
19
40
76
155
237
445
703
1259
2577
21
18
37
70
143
220
410
659
1142
2372
24
17
35
64
135
202
381
600
1083
2196
27
16
32
60
126
190
357
571
1010
2108
31
15
30
57
117
182
337
542
952
1962
38
13
27
51
105
161
299
483
864
1757
46
12
25
47
95
146
278
439
776
1610
53
11
23
42
88
135
249
401
717
1464
61
10
21
40
82
126
234
375
688
1347
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN
14.0" W.C.(3.48 kPa) - NATURAL GAS OR 14.0" W.C. (3.48 kPa) -
PROPANE GAS SUPPLY 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. 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 FIGURE 5).
THE DIRT LEG MUST BE READILY ACCESSIBLE AND NOT SUBJECT
TO FREEZING CONDITIONS. INSTALL IN ACCORDANCE WITH
RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER TO
THE LATEST VERSION OF THE NATIONAL FUEL GAS CODE.
GAS PIPING AND DIRT LEG INSTALLATION
FIGURE 5.
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.
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.
DISCONNECT THE HEATER AND ITS MANUAL GAS SHUTOFF VALVE
FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY
PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45 kPa). GAS
SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED FROM
THE HEATER FOR TEST PRESSURES OF 1/2 PSIG (3.45 kPa) OR
LESS. THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST
BE ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING
THE MANUAL GAS SHUTOFF VALVE.
GAS METER SIZE
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.
NOMINAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS (BTU/HR)
NOMINAL IRON PIPE SIZES (INCHES)
INPUT IN KW