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Gas Pipetrain:
The pipetrain includes High & Low Gas Pressure Safety Switches, two manual ball valves, two 120 VAC Solenoid Shut-off
Valves, a Main Gas Pressure Regulator, and gas test ports per the requirements of UL795. Upon request the pipetrain
can be supplied without a Gas Pressure Regulator, but the correct Gas Pressure Regulator must be installed before
operation. The pipetrain components may be shipped separate, and minor field plumbing and wiring are required.
Additional pipetrains that comply with CSD-1, NFPA, FM or GAP (formerly IRI) are available. Upon request, the pipetrain
can be pre-assembled and pre-wired.
Gas Train Connection:
In most cases, the burner is supplied with a pre-assembled gas train. If this is the case, attach the gas train to the gas
inlet connection of the burner (figure 4) making sure the gas train is orientated properly. The solenoid shut off valves and
pressure regulator have arrows on the housings that indicate the direction of gas flow. When making connections that
utilize NPT threads, use pipe joint compound that is resistant to the effects of liquefied petroleum gases. Turn the manual
valves in the gas train to the off position. Using new black iron pipe and malleable fittings, connect the gas supply piping
to the inlet of the gas train (figure 4). Refer to Section I.D, GAS SUPPLY PIPING.
NOTE: When connecting the gas train to the burner, the length of piping between the ball valve closest to the burner and
the gas inlet on the burner, must not exceed 20”. If installation of the burner and gas train to the equipment requires
lengthening the gas train, the length of pipe (including the ball valve) must not exceed 25” in total.
Figure 4
If the gas train is not pre-assembled, use new black iron pipe, malleable fittings, and suitable pipe joint compound to
assemble the gas train. Examples of assembled gas trains are shown in Figures 31 and 32 (pages 41-44). The manual
valves, solenoid valves, pressure switches and pressure regulator must be connected as described in the installation
instructions for the given component, and in the flow sequence as shown in Figures 31 or 32. The solenoid shut off valves
and pressure regulator have arrows on the housings that indicate the direction of gas flow. When assembling these
components into the gas train, make sure the arrows point in the direction of gas flow. Following the assembly of the gas
train, attach it to the burner and gas supply piping as described above.
Note: The gas train, and all its safety components, should be leak tested after installation. 1/8″ NPT fittings have been
provided to isolate and test the solenoid valves. The train, and all safety components, should be tested for leaks and
functionality at regular intervals.
Note: Gas trains are heavy causing stress to the gas connections on the burner. The gas train must be properly
supported to minimize the potential for stress on the burner’s gas piping connections.
Electrical Connections:
The installation must be wired and GROUNDED in accordance with local codes or in their absence, with the National
Electric Code ANSI/NFPA No. 70-2002 or latest edition.
In CANADA, all wiring shall be done in accordance with the Canadian Electrical Code.
Gas Inlet
Pressure Tap