HTP 850 LPHL - Manual (Page 35)

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LP- 205 REV. 3.28.14
PART 6 – GAS PIPING
FAILURE TO FOLLOW ALL PRECAUTIONS IN THIS SECTION COULD RESULT IN FIRE, EXPLOSION, OR DEATH!
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than 14"
w.c. (3.5 kPa), and a minimum of 3.5" w.c. (.87 kPa). The entire piping
system, gas meter and regulator must be sized properly to prevent
pressure drop greater than 0.5" (.12 kPa) as stated in the National
Fuel Gas Code. This information is listed on the rating label.
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
/4” for the Mod Con 300, 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.
It is very important that you are connected to the type of gas noted on
the rating plate. “LP” for liquefied petroleum, propane gas, or “NAT”
for natural or city gas. You must not do a gas conversion without an
approved gas conversion kit. Prior to turning the gas on, all gas
connections must be approved by the local gas supplier or utility, in
addition to the governing authority.
A gas conversion kit comes with the boiler. Follow the included
instructions carefully. Failure to follow gas conversion instructions
could result in property damage, serious injury, or death.
Figure 19 – Gas Connection