Mainstreet Equipment 541FF40N User Manual page 9

User Manual
Step 5: Gas Connection
• A 3/4" male NPT line for the gas connection is located near the lower right rear corner of the fryer. The serial
plate (located inside the front door of the fryer) indicates the type of gas the unit is equipped to burn (natural
gas or propane). The fryer should be connected ONLY to the type of gas for which it is equipped.
• A circuit diagram is located inside the front door of the fryer.
• All Mainstreet Equipment equipment is adjusted at the factory; however, pilot height should be checked at
installation and adjusted, if necessary.
• For orifice sizes and pressure regulator settings, see the chart on page 5. If the fryer is being installed at over
2,000 feet altitude and that information was not specified when ordered, contact the appropriate authorized
Mainstreet Equipment Service Representative or the Mainstreet Equipment Service Department. Failure to
install with proper orifice sizing will result in poor performance and may void the warranty.
• If applicable, the vent line from the gas appliance pressure regulator shall be installed to the outdoors in
accordance with local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1,
Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Installation Code, CAN/CGA-B149.2, as applicable.
• An adequate gas supply is imperative. Undersized or low pressure lines will restrict the volume of gas
necessary for satisfactory performance. A combination gas valve and pressure regulator, which is provided
with each unit, is set to maintain a 4" W.C. manifold pressure for natural gas or 10.0" W.C. manifold pressure
for propane gas. However, to maintain these conditions the pressure on the supply line, when all units
are operating simultaneously, should not drop below 7" W.C. for natural gas or 11" W.C. for propane gas.
Fluctuations of more than 25% on natural gas or 10% on propane gas will create problems and affect burner
operating characteristics. A 1/8" tap to measure the manifold pressure is located on the combination gas
valve, which is on the burner manifold located directly below the burners inside the cabinet.
• Purge the supply line to clean out dust, dirt, or other foreign matter before connecting the line to the unit.
• It is recommended that an individual manual shutoff valve be installed in the gas supply line to the unit.
• Use pipe joint compound that is suitable for use with both natural and LP gas on all threaded connections.
ALL PIPE JOINTS AND CONNECTIONS MUST BE TESTED THOROUGHLY FOR GAS LEAKS. USE ONLY SOAPY WATER FOR
TESTING ON ALL GASES. NEVER USE AN OPEN FLAME TO CHECK FOR GAS LEAKS. ALL CONNECTIONS MUST BE CHECKED
FOR LEAKS AFTER THE UNIT HAS BEEN PUT INTO OPERATION. TEST PRESSURE SHOULD NOT EXCEED 14" W.C.
THIS APPLIANCE AND ITS INDIVIDUAL COMBINATION GAS VALVE MUST BE DISCONNECTED FROM THE GAS SUPPLY
PIPING SYSTEM DURING ANY PRESSURE TESTING OF THAT SYSTEM AT TEST PRESSURES IN EXCESS OF 14"WC (1/2 PSIG
or 3.45 kPa).
If the incoming gas pressure is in excess of 14"WC (1/2PSI, 3.45 kPa), a proper step-down regulator will be
required. See PHOTO 1 for LP application
Mainstreet Equipment
CAUTION
CAUTION
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