42
LP- 446 REV. 9.3.14
Do not attempt to support the weight of gas piping with the boiler or its accessories. The gas valve and blower will not support the
weight of the piping. Failure to follow this warning could result in substantial property damage, severe personal injury, or death.
The gas connection on the boiler is 1-1/2
” for the Mod Con 500, and 2” for the
Mod Con 850. It is mandatory that this fitting is used for connection to a field
fabricated drip leg as shown in the illustration above per the National Fuel Gas
Code. You must ensure that the entire gas line to the connection at the boiler is
no smaller than the unit supplied connection.
Once all inspections have been performed, the piping must be leak tested. If
the leak test requirement is at a higher test pressure than the maximum inlet
pressure, you must isolate the boiler from the gas line. To do this, shut the gas
off using factory and field-installed gas cocks. Failure to do so may damage the
gas valve. In the event the gas valve is exposed to a pressure greater than ½
PSI, 14" w.c. (3.5 kPa), the gas valve must be replaced. Never use an open
flame (match, lighter, etc.) to check gas connections.
B. GAS PIPING
1. Run the gas supply line in accordance with all applicable codes.
2. Locate and install manual shutoff valves in accordance with state and local
requirements.
3. In Canada, the Manual Shutoff must be identified by the installing contractor.
4. It is important to support gas piping as the unit is not designed to structurally support a large amount of weight.
5. Purge all gas lines thoroughly to avoid start up issues with air in the lines.
6. Sealing compound must be approved for gas connections. Care must be taken when applying compound to prevent blockage or
obstruction of gas flow which may affect the operation of the unit.
Failure to apply pipe sealing compound as detailed above could result in substantial property damage, severe personal injury, or death.
CSA / UL listed flexible gas connections can be used when installing the boiler. Flexible gas connections have different capacities and
must be sized correctly for the connected boiler firing rates. Consult with the flex line supplier to assure the line size is adequate for the
job. Follow local codes for proper installation and service requirements.
Never use an open flame (match or lighter) to check for gas leaks. Use a soapy solution to test connection. Failure to use a soapy
solution test or check gas connection for leaks could result in substantial property damage, severe personal injury, or death.
Use a two-wrench method when tightening gas piping near the boiler and its piping connection: One wrench to prevent the boiler gas
line connection from turning; the second to tighten the adjacent piping. Failure to support the boiler gas piping connection could
damage the boiler beyond repair. Such damage IS NOT covered by warranty.
C. GAS TABLE
Refer to Table 15 to size the supply piping to minimize pressure drop between the meter or regulator and unit.
Maximum
capacity of pipe in cubic feet of gas per hour for gas pressures of .5 w.c. or less and a pressure drop of .3 inch w.c.
Содержание 500 HL
Страница 12: ...12 LP 446 REV 9 3 14 Figure 2 Dimensions and Specifications ...
Страница 21: ...21 LP 446 REV 9 3 14 H PIPING DIAGRAMS Figure 6 ...
Страница 44: ...44 LP 446 REV 9 3 14 E GAS VALVE Figure 26 Mod Con 500 Gas Valve ...
Страница 52: ...52 LP 446 REV 9 3 14 Figure 33 Mod Con Internal Connection Diagram LP 428 K ...
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