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American Water Heater Commercial Ultra Low NOx Gas water Heater Benutzerhandbuch

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TABLE 4. GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN 
CUBIC FEET PER HOUR
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.
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.
PURGING
Gas line purging is required with new piping or systems in which air 
has entered.
 
 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.
GAS METER SIZE — NATURAL GASES ONLY
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.
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.
The minimum gas supply pressure for input adjustment must not be less 
than 6" w.c. (1.49 kPa) for natural gas and 11" w.c. (2.73 kPa).
Do not subject the combination gas valve to inlet gas pressures of more 
than 14.0" w.c. (3.48 kPa) - natural gas.  A service regulator is necessary 
if higher gas pressures are encountered.
Gas pressure specified in Table 5, refer to flow pressure taken at pressure 
tap of automatic gas valve while heater is operating.
TABLE 5.
Type of
Gas
Input
Manifold 
Pressure
Natural
75,100 Btu/hr
22 KW/hr
4.0 in. W.C.
1.12 kPa
OPERATION
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.
 
 WARNING
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. 
LENGTH
IN
FEET
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
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 230000
20
120 250 485
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
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
1/2" 3/4" 1"
1 1/4" 1 1/2"
2"
2 1/2"
3"
4"
3.0
51
105 199 410
615
1160 1845
3221
6735
6.1
35
73
142 278
428
805
1277
2255
4626
9.1
28
59
110 225
346
644
1031
1830
3748
12.2
24
50
94
193
290
556
878
1552
3192
15.2
21
44
83
170
264
492
776
1391
2840
18.3
19
40
76
155
237
445
703
1259
2577
21.3
18
37
70
143
220
410
659
1142
2372
24.4
17
35
64
165
202
381
600
1083
2196
27.4
16
32
60
126
190
357
571
1010
2108
30.5
15
30
57
117
182
337
542
952
1962
38.1
13
27
51
105
161
299
483
864
1757
45.7
12
25
47
95
146
278
439
776
1610
53.3
11
23
42
88
135
249
401
717
1464
61.0
10
21
40
82
126
234
375
688
1347