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TABLE 4. GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
NORMAL IRON PIPE SIZES (INCHES)
LENGTH
INPUT IN THOUSANDS BTU/HR
IN
FEET
1/2" 3/4"
1"
1 1/4"
10
175
360
680
1400
20
120
250
485
950
30
97
200
375
770
40
82
170
320
660
50
73
151
285
580
60
66
138
260
530
70
61
125
240
490
80
57
118
220
460
90
53
110
205
430
100
50
103
195
400
125
44
93
175
360
150
40
84
160
325
175
37
77
145
300
200
35
72
135
280
LENGTH
NORMAL IRON PIPE SIZES (INCHES)
IN
METERS
1/2" 3/4"
1"
1 1/4"
3.0
51
105
199
410
6.1
35
73
142
278
9.1
28
59
110
225
12.2
24
50
94
193
15.2
21
44
83
170
18.3
19
40
76
155
21.3
18
37
70
143
24.4
17
35
64
165
27.4
16
32
60
126
30.5
15
30
57
117
38.1
13
27
51
105
45.7
12
25
47
95
53.3
11
23
42
88
61.0
10
21
40
82
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.
FLAME OR OTHER SOURCES OF IGNITION FOR THIS PURPOSE.
FIGURE 5. GAS PIPING AND SEDIMENT TRAP INSTALLATION
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.
1 1/2"
2"
2 1/2"
3"
2100
3960
6300
11000 230000
1460
2750
4360
7700
1180
2200
3520
6250
990
1900
3000
5300
900
1680
2650
4750
810
1520
2400
4300
750
1400
2250
3900
690
1300
2050
3700
650
1220
1950
3450
620
1150
1850
3250
550
1020
1650
2950
500
950
1500
2650
460
850
1370
2450
430
800
1280
2280
INPUT IN KW
1 1/2"
2"
2 1/2"
3"
615
1160
1845
3221
428
805
1277
2255
346
644
1031
1830
290
556
878
1552
264
492
776
1391
237
445
703
1259
220
410
659
1142
202
381
600
1083
190
357
571
1010
182
337
542
952
161
299
483
864
146
278
439
776
135
249
401
717
126
234
375
688
DO NOT USE MATCHES, CANDLES,
Gas line purging is required with new piping or systems in which air
has entered.
PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED
4"
IN THIS TYPE GAS SERVICE. TO AVOID RISK OF FIRE OR
EXPLOSION, PURGE DISCHARGE MUST NOT ENTER CONFINED
15800
AREAS OR SPACES WHERE IGNITION CAN OCCUR. THE AREA
MUST BE WELL VENTILATED AND ALL SOURCES OF IGNITION
12800
MUST BE INACTIVATED OR REMOVED.
10900
9700
GAS METER SIZE — NATURAL GASES ONLY
8800
Be sure the gas meter has sufficient capacity to supply the full rated gas
8100
input of the water heater as well as the requirements of all other gas fired
7500
equipment supplied by the meter. If gas meter is too small, ask the gas
7200
company to install a larger meter having adequate capacity.
6700
GAS PRESSURE REGULATOR
6000
5500
The gas pressure regulator is built into the gas valve and is equipped to
5000
operate on the gas specified on model and rating plate. The regulator is
4600
factory adjusted to deliver gas to burner at correct water column pressure
allowing for a nominal pressure drop through the controls.
The minimum gas supply pressure for input adjustment must not be less
4"
than 6" w.c. (1.49 kPa) for natural gas and 11" w.c. (2.73 kPa).
6735
4626
Do not subject the combination gas valve to inlet gas pressures of more
3748
than 14.0" w.c. (3.48 kPa) - natural gas. A service regulator is necessary
3192
if higher gas pressures are encountered.
2840
Gas pressure specified in Table 5, refer to flow pressure taken at pressure
2577
tap of automatic gas valve while heater is operating.
2372
2196
2108
Type of
1962
Gas
1757
1610
Natural
1464
1347
It is recommended that a qualified person perform the initial firing of the
heater. At this time the user should not hesitate to ask the individual any
questions which he may have in regard to the operation and maintenance
of the unit.
TO OPERATE THE HEATER
1. Close the heater drain valve (Figure 1) by turning handle
clockwise
.
2. Open a nearby hot water faucet to permit the air in the system
to escape.
3. Fully open the cold water inlet pipe valve (Figure 1) allowing the
heater and piping to be filled.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD
WATER INLET VALVE CLOSED.
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.
9
PURGING
CAUTION
TABLE 5.
Input
75,100 Btu/hr
22 KW/hr
OPERATION
WARNING
Manifold
Pressure
4.0 in. W.C.
1.12 kPa
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