Smith Cast Iron Boilers GB300 - Manual (Page 34)

GB300 BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Page 34
Gas Train Assemblies
All threaded gas train connections must be made using
a pipe compound that is resistant to the actions of
liquefied petroleum gases. Pipe connections should be
secure and tested for leaks. This boiler is designed to
allow for the installation of the gas train on either the
left or right side of the boiler. Locate the gas train in the
most ideal location, but ensure that the train and controls
are protected from water and other possible damage.
Install the supplied pipe cap on the manifold end
opposite the location of the gas train. Install the supplied
reducer coupling to the manifold where the gas train will
be located.
Refer to the Gas Train Assembly Instructions for a
detailed diagram of how the fittings should be arranged
and assembled. The instructions are arranged by gas
train assemblies. Look up the purchased gas train and
confirm all parts for that train are accounted for.
Assemble the train as depicted in the instructions. Refer
to the GAS SUPPLY PIPING section of this manual to
make the final connection to the main gas supply.
For installations in Canada a manual shutoff valve must
be installed between the manifold and the first gas valve.
On gas trains with two valves the V88A valve must be
installed first (closest to supply), followed by the regulating
valve closest to manifold, Figure 91. Refer to diagrams
in gas train assembly book.
Figure 91 Gas Train, Valve Orientation
Pilot Assembly
The pilot assembly must be performed after the
installation of the control box.
The pilot assemblies are fed gas through 1/4" aluminum
tubing. The tubing is supplied in a bulk roll and must be
cut to fit in the field. Use an appropriate tubing cutter to
cut the rolls to length. Debur and clean all cuts to ensure
a clean line without blockage or interference. Use a
tubing bender to bend the tube and the supplied tubing
clamps to fasten it to the boiler jacket. Figure 92 and
Figure 93 show a recommended layout of the pilot
tubing. The gas train instruction manual shows the
component layout and how the fittings are arranged on
the purchased gas train page.
Figure 92 Single Pilot Tubing Run 5 - 12 Sect
Figure 93 Double Pilot Tubing Run 13 - 21 Sect
For installations in Canada a manual shutoff valve must
be installed between the pilots.
The pilot tubing runs must be done in a neat, workman
like manner. Use the provided tubing clamps and screws
to attach the pilot tubing to the jacket as required.