Part 7 - Gas Connections; Gas Piping - Westinghouse 220VWH Manual

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 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 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.
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.
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
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.
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
37