MAKING THE GAS CONNECTION
DANGER: Only carry out work on gas conduits and fittings if you are licensed for such work.
-Determine proper size gas pipe for the installation using Table 3 and Table 4. Do not forget the pipe fitting losses and observe proper size of the fittings.
-Install the furnished 3/4” female gas cock on the gas connection (3/4” male on the boiler) (Fig. 13).
-Connect the gas pipe to the gas cock so that it is free from any strain.
CAUTION: The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).
Fig. 13 |
| |
| A | |
A- Manual main gas shutoff | B | |
C | ||
valve (supplied) | ||
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B- Coupling (field supplied) |
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C- To gas supply |
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NOTICE: When installing the gas supply connection, it must comply with local regulations or, if such regulations do not exist, with the National Fuel Gas Code, ANSI Z 223.1.
In Canada, the gas supply connection must comply with local regulations or, if such regulations do not exist, with CAN/CSA B149, Natural Gas and Propane Installation Code. A sediment trap must be provided upstream of the gas controls.
Gas Pipe Capacity for different pipe sizes | Tab. 3 | |||||
Length of |
| Gas Volume Capacity |
| |||
pipe (feet) |
|
| (ft3/h)* |
|
| |
| 3/4” |
| 1” |
| 1 1/4” | 1 1/2” |
10 | 278 |
| 520 |
| 1,060 | 1,600 |
20 | 190 |
| 350 |
| 730 | 1,100 |
30 | 152 |
| 285 |
| 590 | 890 |
40 | 130 |
| 245 |
| 500 | 760 |
50 | 115 |
| 215 |
| 440 | 670 |
75 | 93 |
| 175 |
| 360 | 545 |
100 | 79 |
| 160 |
| 305 | 480 |
150 | 64 |
| 120 |
| 250 | 380 |
*Maximum pipe capacity in ft3/hr, based on a specific gravity of 60 (42 mbar) and a inlet gas pressure of 14 inches W.C. (35 mbar) or less and a pressure drop of 0.3 inches W.C. (20 mbar)
Equivalent length for pipe fittings in feet | Tab. 4 | |||||
Steel pipe | Equivalent length for Pipe Fittings in feet | |||||
diameter |
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|
|
| ||
| Type of pipe fitting |
| ||||
in inches | 90° Elbow | Tee | Gate valve |
| Gas cocks | |
|
|
| (flow thru |
|
|
|
|
|
| branch) |
|
|
|
|
|
| Equivalent | length in feet |
|
|
3/4 |
| 2.1 | 4.1 | 0.5 |
| 1.25 |
1 |
| 2.6 | 5.2 | 0.6 |
| 1.60 |
1 1/4 |
| 3.5 | 6.9 | 0.8 |
| 2.15 |
1 1/2 |
| 4.0 | 8.0 | 0.9 |
| 2.50 |
NOTICE: The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).
Open
position
Fig. 14
Closed position
22
