INSTALLATION GFS SERIES TUBE FRYERS
PAGE 10 OPERATOR’S MANUAL 1182026 REV 2
INSTALLATION
Step 5: Gas Connection
A 3/4" male NPT line for the gas connection is located near the lower left rear corner of the fryer (see
illustration on page 7). The serial plate (located inside the f ront do or of the f r yer) indicates the type of gas the
unit is equipped to burn (natural gas or propane). The fryer should be connected ONLY t o the t ype of gas f or
which it is equipped.
A millivoltage circuit diagram is located inside t he front door of the fryer.
All Southbend equipment is adjusted at the factor y; however, pilot height s hould be check ed at installation
and adjusted, if necessary (see page 22).
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 th e appropriate authori zed
Southbend Service Representative or the Southbend Service Department. Failur e to install with proper
orifice sizing will result in poor perform ance and may void the warranty.
If applicable, the vent line from the gas appliance pres sure regulator shall be installed to the outdoors in
accordance with local codes or, in the absence of local c odes, with the National Fuel Gas Code, ANSI
Z223.1, Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Installation Co de, CAN/CGA-
B149.2, as applicable.
An adequate gas supply is imperative. Undersized or low press ure lines will restrict the volume of gas
necessary for satisfactory performance. A combination gas valve and pressure re gulator, which is pr ovided
with each unit, is set to maintain a 4" W.C. manifold pressure for natur al gas or 1 0.0 " W .C. manifold pressure
for propane gas. However, to maintain these conditions the pressure on the s upply 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 propan e g as will c reate pr obl em s and af fec t burner
operating characteristics. A 1/8" tap to measure the m anifold 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 foreig n 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 n atural and LP gas on all threaded connections.
! CAUTION
ALL PIPE JOINTS AND CONNECTIONS MUST BE TESTED THORO UGHLY 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 CHEC KED FOR LEAKS AFTER TH E
UNIT HAS BEEN PUT INTO OPERATION. TEST PRESSURE SHO ULD NOT EXCEED 14" W.C.
! CAUTION
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 1/2 PSIG ( 3.45 kPa).
The appliance must be isolated from the gas supply piping s ystem by closing its individua l manual
shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or
less than 1/2 psi (3.45 kPa).
Connect the gas supply directly to the 3/4" male NPT connec tor loc ated near t he lower lef t rear cor ner of the
fryer. When tightening the supply pipe, be sure to hold the m ating connector extending from the unit securel y
with a wrench. This will prevent any damage or distortio n to the internal piping and controls of the unit.
After connecting the gas supply, check again that the fryer is level. Use a lon g spirit level f our ways; acros s
the front and rear of the frypot, and along each edge.