TABLE 2
CAPACITY OF PIPE - NATURAL GAS IN CUBIC FEET PER HOUR
Maximum Based Upon Pressure Drop of 0.3” w.c. and Specific Gravity
of 0.60 and Maximum Gas Pressure of .5 psig.
Pipe Length |
|
| Pipe Size - Inches (IPS) |
|
|
| |||
In Feet |
| 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 |
|
10 |
| 520 | 1050 | 1600 | 3050 | 4800 | 8500 | 17500 |
|
20 |
| 350 | 730 | 1100 | 2100 | 3300 | 5900 | 12000 |
|
30 |
| 285 | 590 | 890 | 1650 | 2700 | 4700 | 9700 |
|
40 |
| 245 | 500 | 760 | 1450 | 2300 | 4100 | 8300 |
|
50 |
| 215 | 440 | 670 | 1270 | 2000 | 3600 | 7400 |
|
60 |
| 195 | 400 | 610 | 1150 | 1850 | 3250 | 6800 |
|
70 |
| 180 | 370 | 560 | 1050 | 1700 | 3000 | 6200 |
|
80 |
| 170 | 350 | 530 | 990 | 1600 | 2800 | 5800 |
|
90 |
| 160 | 320 | 490 | 930 | 1500 | 2600 | 5400 |
|
100 |
| 150 | 305 | 460 | 870 | 1400 | 2500 | 5100 |
|
125 |
| 130 | 275 | 410 | 780 | 1250 | 2200 | 4500 |
|
150 |
| 120 | 250 | 380 | 710 | 1130 | 2000 | 4100 |
|
175 |
| 110 | 225 | 350 | 650 | 1050 | 1850 | 3800 |
|
200 |
| 100 | 210 | 320 | 610 | 980 | 1700 | 3500 |
|
NOTE: Use Multiplier at right for other specific gravities and pressure drops.
CORRECTION FACTORS
Specific Gravity | Pressure Drop | |||||
Other than 0.60 | Other than 0.3 | |||||
Specific |
|
|
| Multplier | Pressure | Multiplier |
Gravity |
|
|
|
| Drop |
|
0.50 | 1.10 | 0.1 | 0.577 | |||
0.60 | 1.00 | 0.2 | 0.815 | |||
0.70 | 0.926 | 0.3 | 1.00 | |||
0.80 | 0.867 | 0.4 | 1.16 | |||
0.90 | 0.817 | 0.6 | 1.42 | |||
1.00 | 0.775 | 0.8 | 1.64 | |||
Propane - Air | 1.0 | 1.83 | ||||
1.10 |
|
| 0.740 | 2.0 | 2.58 | |
|
| |||||
Propane | 3.0 | 3.16 | ||||
1.55 |
|
| 0.622 | 4.0 | 3.65 | |
| ||||||
|
|
|
|
| 6.0 | 4.47 |
|
|
|
|
| 8.0 | 5.15 |
Where an existing chimney or vent is to be used, be sure that the chimney or vent has adequate capacity for the number and sizes of gas appliances being vented through it. Inspect the chimney or vent and remove all soot or other obstructions, which will retard free draft.
Vent piping making horizontal runs must have a minimum upward slope toward the chimney or vent of 1/4” per foot. Vent pipe length should be kept as short as possible. Be sure that the vent pipe does not extend beyond the inside wall of a chimney.
In venting systems, where a continuous or intermittent back (positive) draft is found to exist, the cause must be determined and corrected. In some cases, a special vent cap may be required.
WATER LINE CONNECTIONS
The water heater may be installed by itself, or with a separate storage tank, on both single and
SYSTEM CONNECTIONS
The system installation must conform to these instructions and to the local code authority having jurisdiction. Good practice requires that all heavy piping be supported.
THERMOMETERS (Not supplied)
Thermometers should be obtained and field installed as shown in the installation diagrams.
Thermometers are installed in the system as a means of detecting the temperature of the outlet water.
RELIEF VALVE
This water heater has been provided with an ASME rated pressure and temperature relief valve.
In addition to the appliance relief valve, each remote storage tank, which may be used in conjunction with this appliance, shall also be installed with a properly sized, rated and approved temperature (ANSI) and pressure (ASME) relief valve(s).
WARNING
THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSIONS, SYSTEM OR HEATER DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE RELIEF VALVE AND THE TANK.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES, RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS. DO NOT THREAD OR CAP THE END OF THIS LINE. RESTRICTED OR BLOCKED DISCHARGE WILL DEFEAT THE PURPOSE OF THE VALVE AND IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO ALLOW COMPLETE DRAINAGE OF BOTH THE VALVE AND LINE.
Your local code authority may have other specific relief valve requirements.
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.
Size the main gas line in accordance with Table 3. The figures shown are for straight lengths of pipe at 0.3 in. w.c. pressure drop, which is considered normal for
Equivalent lengths of standard pipe in feet for listed fittings (add below values to Table 3).
Install vent lines from main gas regulator and (if applicable) a diaphragm gas valve. Vent line should be run to the outside of the building, terminating clear of windows or fresh air intakes. Outside terminal of vent should have a screen to prevent insects from building nests in vent pipe. The vent should terminate in a manner, which will preclude the possibility of water, snow, dirt or other matter from entering the line.
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