Lang 424T, Owner'S Manual

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This appliance and its pressure regulator must be isolated from the gas supply piping system by closing
its individual manual shutoff valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 PSIG (3.45KPA). For the protection of you and your property, we
recommend a qualified installing agency install this unit. They should be familiar with gas installations
and your local gas company requirements. In any case, your gas company should be called to approve
the final installation. Detailed instructions should be posted in a prominent location, to be followed
in the event the operator smells gas. Obtain the instructions from the local gas supplier.
GAS PIPING
Gas piping will need to be installed correctly and be an appropriate size to provide a supply of gas
sufficient to meet the full gas input of the appliance. If the appliance is to be connected to existing
piping, it will need to be checked to determine if it has adequate capacity before installation. Joint
compound should be used sparingly and only on the male threads of the pipe joints. Any compounds
used will need to be resistant to LP and Natural gases.
Any loose dirt or metal particles which are allowed to enter the gas lines on this appliance will damage
the valve and affect its operation. When installing this appliance, all pipe and fittings must be free from
loose dirt.
MANUAL SHUT-OFF VALVE
A manual shut-off valve should be installed upstream from the union and within six [6] feet (1.829 m)
of this unit.
GAS PRESSURE REGULATOR
A convertible pressure regulator is provided with each griddle. It should be connected to the inlet
pipe at the rear of the unit. The gas supply line is then connected to it. It is shipped set for 5-inch
water column manifold pressure for use with natural gas. For LP use, the pressure will need to be
adjusted as directed in the steps below.
GAS CONVERSION
This griddle is equipped with fixed orifice hoods and is shipped from the factory for use on natural
gas or LP. To convert to LP [propane] from natural gas [or vice versa], install the alternate burner
orifice hoods located in the grease drawer, using the following procedure.
i. Remove the front panel by removing the screws located on the front and bottom.
ii. Remove the burners from the orifice hoods. This is accomplished by removing the burner mounting
screws and sliding the burners off the hoods.
iii. Remove the natural gas orifice hoods and install the propane hoods the were provided.
iv. Reinstall the burners.
v. Reinstall the front panel.
vi. Remove the slotted, or hex-headed, plug from the pressure regulator. Invert the plug and reinstall.
The letters “LP” should now be visible on the plug. The regulator is now set for 10-inch water column
manifold pressure. To check pressure, a 1/8-inch pipe plug on the manifold can be removed for
attaching a pressure gauge.