J. NATURAL GAS FUEL PIPING SYSTEM
It is important to remove the oil sleeve and install the gas sleeve in the 360 and 520
model burners when firing natural gas.
Hauck requires the use of gas manifolds which meet NFPA guidelines. NFPA requires two shutoff valves wired in series
and a shutoff cock downstream of the second (blocking) shutoff valve and high and low pressure switches which are
interlocked with the burners shutoff valves. Hauck gas manifolds have been designed to meet NFPA requirements.
Install a controlling gas regulator in the main gas line within 25 feet of the burner. For good control, supply 15-25
psig to this regulator. This regulator should be sized to provide the required gas flow at the inlet of the burner
manifold; 2 psig to 4 psig is a nominal expected gas pres-sure. Exact gas pressures will be set at start-up.
A manual shutoff valve and gas strainer must be installed upstream of the gas control regulator. This shutoff
valve facilitates servicing of the gas control regulator, filter device and other components in the gas manifold.
The gas company should purge the main gas line for scale and dirt before it is attached to the burner gas
Connect the main gas line (see fig. 8).
Install a flexible fitting in the gas manifold to reduce flexing of the manifold resulting from plant vibrations.