VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
WARNING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIATION.
CAUTION
DO NOT TERMINATE THE VENTING WHERE NOISE FROM THE EXHAUST OR INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO ORACROSS FROM WINDOWS AND DOORS.
FIGURE 33
VENT TERMINALS
The vent system must terminate so that proper clearances are maintained as cited in local codes or the current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
The
Assure the exhaust vent terminal is not in a public area where the hoods are exposed. The exhaust vent terminal gets very HOT during operation and can cause burns. Please use caution when working around the exhaust vent terminal.
It is imperative that the area around the vent terminal hoods are kept clear from obstructions so plenty of fresh air is available for combustion.
The vent shall terminate a minimum of 12" (30.5 cm) above expected snowfall level to prevent blockage of vent termination.
WARNING
USE ONLY THE VENT TERMINALS SUPPLIED WITH THIS UNIT. TERMINATION OF A VENT SYSTEM WITH A DEVICE OTHER THAN THE SUPPLIED VENT TERMINATIONS WILL AFFECT SYSTEM PERFORMANCE AND RESULT IN A SAFETY HAZARD.
PRESSURE SWITCHES
The
CAUTION
THE WATER HEATER IS POLARITY SENSITIVE. BEFORE APPLYING ELECTRICITY TO THIS HEATER BE CERTAIN THAT SUPPLY NEUTRAL WIRE TO GROUND CHECK INDICATES ZERO VOLTAGE.
GAS PIPING
Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area.
TABLE 3
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
(Based upon a Pressure Drop of 0.5 inch Water Column
and 0.6 Specific Gravity Gas
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 | 23000 |
20 | 120 | 250 | 485 |
| 950 | 1460 | 2750 | 4360 | 7700 | 15800 |
30 | — | 200 | 375 |
| 770 | 1180 | 2200 | 3520 | 6250 | 12800 |
40 | — | 170 | 320 |
| 660 | 990 | 1900 | 3000 | 5300 | 10900 |
50 | — | 151 | 285 |
| 580 | 900 | 1680 | 2650 | 4750 | 9700 |
60 | — | 138 | 260 |
| 530 | 810 | 1520 | 2400 | 4300 | 8800 |
70 | — | 125 | 240 |
| 490 | 750 | 1400 | 2250 | 3900 | 8100 |
80 | — | — | 220 |
| 460 | 690 | 1300 | 2050 | 3700 | 7500 |
90 | — | — | 205 |
| 430 | 650 | 1220 | 1950 | 3450 | 7200 |
100 | — | — | 195 |
| 400 | 620 | 1150 | 1850 | 3250 | 6700 |
125 | — | — | 175 |
| 360 | 550 | 1020 | 1650 | 2950 | 6000 |
150 | — | — | 160 |
| 325 | 500 | 950 | 1500 | 2650 | 5500 |
175 | — | — | 145 |
| 300 | 460 | 850 | 1370 | 2450 | 5000 |
200 | — | — | 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 | — | 59 | 110 | 225 | 346 | 644 | 1031 | 1830 | 3748 |
12.2 | — | 50 | 94 | 193 | 290 | 556 | 878 | 1552 | 3192 |
15.2 | — | 44 | 83 | 170 | 264 | 492 | 776 | 1391 | 2840 |
18.3 | — | 40 | 76 | 155 | 237 | 445 | 703 | 1259 | 2577 |
21.3 | — | 37 | 70 | 143 | 220 | 410 | 659 | 1142 | 2372 |
24.4 | — | — | 64 | 135 | 202 | 381 | 600 | 1083 | 2196 |
27.4 | — | — | 60 | 126 | 190 | 357 | 571 | 1010 | 2108 |
30.5 | — | — | 57 | 117 | 182 | 337 | 542 | 952 | 1962 |
38.1 | — | — | 51 | 105 | 161 | 299 | 483 | 864 | 1757 |
45.7 | — | — | 47 | 95 | 146 | 278 | 439 | 776 | 1610 |
53.3 | — | — | 42 | 88 | 135 | 249 | 401 | 717 | 1464 |
61.0 | — | — | 40 | 82 | 126 | 234 | 375 | 688 | 1347 |
Size the main gas line in accordance with Table 3. The figures shown are for straight lengths of pipe at 0.5 in. (125 kPa) W.C. pressure drop, which is considered normal for low pressure systems. Note that fittings such as elbows and tees will add to the pipe pressure drop.
CAUTION
DO NOT USE FLEXIBLE GAS PIPING.
15