L.B. White 350 Premier Dual Fuel - Manual (Page 13)

If the heater is to be shut down for cleaning, maintenance,
or repair, follow steps 1-5. Otherwise, set the thermostat to
OFF or NO HEAT for standard shut-down.
1. Close the gas supply valve.
2. Allow the heater to burn off any fuel gas remaining in
the gas supply line.
3. Set the thermostat to OFF or NO HEAT.
4. Position selector switch to OFF
5. Disconnect the heater from its gas and electrical
supplies.
Note: When the thermostat cycles the burner off, the fan
motor will continue to run for 1 minute, allowing the
heat chamber to cool. After 1 minute, the fan motor
will shut off.
Shut-Down Instructions
1. This feature allows the heater to operate on either
propane or natural gas without changing out the
burner orifice. The gas selector valve is located
between the gas control valve and the burner. Gas
selection is made by repositioning the valve’s handle.
THIS IS NOT A MANUAL GAS SHUT OFF VALVE.
2. Refer to Figs. 10 and 11. The vvalve hhandle m must bbe
properly ppositioned ffor tthe sspecific ggas bbeing uused.
FIG. 10
FIG. 11
3. The hhandle m must bbe ffully sset aat 9 90 ddegrees tto ggas
flow ((propane ggas) oor pparallel tto ggas fflow ((natural ggas)
for pproper ooperation. Do not operate the heater with
the valve handle set between either postion,
otherwise improper operation will occur.
4. The valve’s handle can be locked to prevent improper
positioning. Use the holes provided on the valve’s
body and handle. See Fig. 12.
FIG. 12
Gas Selector Valve
HANDLE POSITION
PROPANE GAS
HANDLE POSITION
NATURAL GAS
14 13