TABLE 4. GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
LENGTH |
|
| NORMAL IRON PIPE SIZES (INCHES) |
| ||||||
IN |
|
|
| INPUT IN THOUSANDS BTU/HR |
|
| ||||
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 | 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 |
|
| NORMAL IRON PIPE SIZES (INCHES) |
| ||||||
IN |
|
|
|
|
| INPUT IN KW |
|
|
| |
METERS | 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 |
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 MUSTBECAPPEDWHENDISCONNECTEDFROMTHEHEATERFORTEST 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 |
| Manifold | |
Gas | Input | Pressure | |
Natural | 75,100 Btu/hr | 4.0 in. W.C. | |
22 KW/hr | 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.
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