LP-517 Rev. 000 Rel. 019 Date 7.21.20
35
Part 8 - Gas Connections
Failure to follow all precautions could result in fire, explosion,
severe injury, or death.
It is very important that you are connected to the type of gas
noted on the rating plate. “NG” for natural or city gas. 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.
The gas supply shall have a minimum of no less than 3.5” water
column, a maximum inlet pressure of no greater than 14” water
column (350 mm), and ½ pound pressure (3.5 kPa). The entire piping
system, gas meter, and regulator must be sized properly to prevent
excessive pressure drop (greater than 0.5” WC) as stated in the
National Fuel Gas Code. This information is listed on the rating plate.
UL recognized fuel gas detectors are recommended in all
enclosed 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 fire,
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 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.
Support gas supply piping with hangers, not by the boiler or its
accessories. The boiler gas valve and blower will not support the
weight of the piping. Make sure the gas piping is protected from
physical damage and freezing, where required. Failure to follow
these instructions could result in gas leakage, and result in fire,
explosion, property damage, severe personal injury, or death.
UNION
GAS SUPPLY
FIELD SUPPLIED
MANUAL SHUT-OFF
DRIP LEG
LP-517-L
08/17/15
Figure 27 - Gas Connection
The gas connection on the boiler is 2”. It is mandatory that this fitting
is used for connection to a field fabricated drip leg as shown in the
illustration 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 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 off using factory and field-
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 flame (match, lighter, etc.) to check
gas connections.
Do not use Teflon tape on gas line pipe thread. Use a pipe compound
rated for use with natural gases. Apply sparingly on male pipe ends,
leaving the two end threads bare and flow unobstructed. Failure to
follow these instructions could result in gas leakage or blockage,
and result in fire, explosion, property damage, severe personal
injury, or death.
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 can result in substantial
property damage, severe personal injury, or death.
