LP-428 Rev. 6.6.16
36
Part 7 - Gas Connections
Failure to follow all precautions could result in re, explosion,
severe injury, or death.
It is very important that you are connected to the type of gas
noted on the rating plate. “LP” for liqueed petroleum, propane
gas, or “NG” for natural or city gas. Do 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 MODCON1000 boilers ONLY.
Field conversions ARE NOT ALLOWED on the MODCON1700. A
properly calibrated combustion analyzer must be used to verify
proper combustion. Failure to follow the above instructions
could result in property damage, serious injury, or death.
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.
UL recognized fuel gas detectors are recommended in all
enclosed propane and natural gas applications where there is a
potential for an explosive mixture of fuel gas to accumulate. The
installation of these detectors should be made in accordance
with the detector manufacturer’s recommendations, and/
or local laws. Failure to install fuel gas detectors in these
applications could result in re, explosion, property damage,
severe personal injury, or death.
A. Gas Piping
1. Run the gas supply line in accordance with all applicable codes.
2. Locate and install manual shuto valves in accordance with
state and local requirements.
3. In Canada, the Manual Shuto must be identied 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.
The gas connection on the boiler is 2” for the MODCON1000
and 2 1/2” for the MODCON1700. It is mandatory that this tting
is used for connection to a eld fabricated drip leg as shown in
the illustration per the National Fuel Gas Code. You must ensure
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 a higher test pressure
than the maximum inlet pressure, you must isolate the boiler
from the gas line. In order to do this, shut the gas o using factory
and eld-installed gas cocks. This will prevent high pressure.
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 ame
(match, lighter, etc.) to check gas connections.
Care must be taken when applying compound to prevent
blockage or obstruction of gas ow which may aect the
operation of the unit.
Figure 24 - Gas Connection
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