38
LP- 428 REV. 9.2.14
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 3
” for the Mod Con 1000 and 4” for the Mod Con 1700. 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 10 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.
NATURAL GAS SUPPLY PIPING CAPACITY CHART
Schedule 40 Iron Pipe in Nominal Inch Size
(0.6 Specific Gravity Gas; 0.5” WC pressure drop)
MODEL
PIPE LENGTH
1 UNIT
2 UNITS
3 UNITS
4 UNITS
Mod Con 1000
100’
2”
3”
3”
4”
250’
2 ½”
3”
4”
4”
Mod Con 1700
100’
2
½”
4”
4”
5”
250’
3”
4”
5”
5”
Table 10
– Gas Supply Piping Size Chart for Mod Con Boilers
Содержание MODCON1000
Страница 40: ...40 LP 428 REV 9 2 14 E GAS VALVE Figure 22 Mod Con 1000 Gas Valve ...
Страница 46: ...46 LP 428 REV 9 2 14 Figure 25 Figure 26 Cascade Resistor Plug Installation Detail ...
Страница 47: ...47 LP 428 REV 9 2 14 Figure 27 Mod Con Cascade Master and Follower Wiring ...
Страница 48: ...48 LP 428 REV 9 2 14 Figure 28 Mod Con Internal Connection Diagram LP 428 K ...
Страница 70: ...70 LP 428 REV 9 2 14 Figure 31 MOD CON 1000 External Parts Blowout ...
Страница 71: ...71 LP 428 REV 9 2 14 Figure 32 MOD CON 1700 External Parts Blowout ...
Страница 72: ...72 LP 428 REV 9 2 14 Figure 33 ...
Страница 73: ...73 LP 428 REV 9 2 14 Figure 34 LP 445 S ...
Страница 74: ...74 LP 428 REV 9 2 14 Figure 35 LP 428 V ...
Страница 75: ...75 LP 428 REV 9 2 14 Figure 36 ...
Страница 78: ...78 LP 428 REV 9 2 14 ...
Страница 79: ...79 LP 428 REV 9 2 14 ...
Страница 80: ...80 LP 428 REV 9 2 14 MAINTENANCE NOTES ...
