Westinghouse WBCETNG1000, Руководство пользователя, Страница: 37 / 74

WHL-038 Rev. 1.29.16
37
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. “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 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 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.
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.
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.