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3.5 GAS CONNECTION
The gas supply (service) line must be the same size or greater than the inlet line of the appliance.
LJS 24G Series gas fryers use a 3/4" NPT (Schedule 40) inlet; however, the gas supply lines must
be sized to accommodate all the gas-fired equipment that may be connected to that supply.
Consult your contractor, gas company or supplier, or other authorized agent for inspection and
installation. Sealant on all pipe joints must be resistant to LP gas.
3.5.1 Manual Shut-off Valve
The manual shut-off valve must be installed in the gas service line ahead of the appliance in the
gas stream and in a position where it can be reached quickly in the event of an emergency.
3.5.2 Gas Pressure Regulation
All commercial cooking equipment must have a pressure regulator on the incoming service line for
safe and efficient operation, since service pressure may fluctuate with local demand. External
regulators are not required on LJS 24G Series gas fryers as the pilot safety control valve regulates
gas pressure. If the incoming pressure is in excess of 1/2" PSI (3.45 kPa), a step-down regulator
will be required.
Check burner manifold pressure with a manometer. Natural gas units require 4" W.C. gas pressure
and propane (LP) units require 11" W.C. gas pressure. If a pressure regulator vent line is installed,
it should be vented to the outside of the building in accordance with local codes, or ANSI Z223.1 (or
current revision).
Disconnect the fryer/individual shut-off valve from the main gas supply when pressure testing
systems in excess of 1/2" PSI (3.45 kPa). When pressure-testing systems equal to or less than 1/2"
PSI (3.45 kPa), isolate the fryer by closing the manual control valve prior to testing.
3.5.3 Gas Valve/Orifice Configuration
LJS 24G Series gas fryers can be connected to either natural or propane gas, depending on the
configuration. The safety control valve and orifices are installed at the factory for the appropriate
gas. If the gas valve and/or orifices require adjustment or conversion in the field, only authorized
service personnel with proper test equipment should make the adjustments or conversion.
3.5.4 Rigid Connections
LJS 24G Series gas fryers come as single units or in multi-unit batteries. Inspect all installer-
supplied gas-intake pipe(s) for dirt, metal dust and other foreign material. Use compressed air to
clear foreign material from supply piping before installing into a service line. Failure to do this can
result in clogged orifices and gas valve damage when gas pressure is applied.
All connections must be sealed with a joint compound suitable for LP gas, and all connections must
be tested with a soapy solution before lighting any pilots. DO NOT USE AN OPEN FLAME TO
CHECK FOR LEAKS! Detecting gas leaks with an open flame is not only dangerous, but will often
miss small leaks that a soapy solution would detect.