Part 7 - Gas Connections; Gas Piping - Westinghouse WBRE80 User Manual

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Part 7 - 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. "LP" for liquefied petroleum, propane
gas, or "NG" for natural or city gas. Do not do a gas conversion
without an approved gas conversion kit. Follow the included
instructions VERY carefully if converting the boiler. 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. Failure to follow these 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 fire, explosion, property damage,
severe personal injury, or death.
The gas connection on the boiler is 3/4" for 80/110/150 models
and 1" for the 220/299/301/399 models. 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
pres¬sure 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.
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
WHL-052 Rev. 4.28.16
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.
Do not use Teflon tape on gas line pipe thread. Use a pipe
compound rated for use with natural and propane 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.
Figure 26 - Gas Connection