United States Pumice Company WG-2436G - Manual (Page 10)

INITIAL ADJUSTMENT
IMPORTANT:
PRESSURE ADJUSTMENT
MUST BE PERFORMED BY
A QUALIFIED TECHNICIAN
ONLY.
IMPORTANT:
FLAME ADJUSTMENT
MUST BE PERFORMED BY
A QUALIFIED TECHNICIAN
ONLY.
IMPORTANT:
FLAME ADJUSTMENT
MUST BE PERFORMED BY
A QUALIFIED TECHNICIAN
ONLY.
PURGING AIR FROM GAS LINES
Air must be purged from the gas lines for the initial startup.
Turn the knob on the safety valve to PILOT, press and hold until a
flame can be established at the pilot burner. Repeat for each pilot.
Caution must be taken to ensure that no raw gas is present in the
surrounding area when attempting to place the Griddle into
operation.
SET GAS PRESSURE:
Turn the gas shut-off valve OFF.
Remove the plug in the gas pressure measurement tap and attach a
manometer. Turn the shut-off valve ON. Light the pilot light and turn
both gas control valves to HI.
Remove the cap from the pressure regulator. Turn the adjusting
screw clockwise to increase pressure; counter-clockwise to decrease
pressure. Adjust the gas pressure regulator for:
5” water column (natural gas); or, 10” water column (propane).
When finished, replace cap on regulator, turn shut-off valve OFF,
remove manometer and reinstall plug in tap. Turn shut-off valve
back ON and relight the pilot light.
PILOT FLAME ADJUSTMENT
The pilot flame may be adjusted at the safety valve by removing the
pilot adjusting screw cover (notice the fiber washer) and turning the
adjusting screw until the pilot flame covers
3 /
8
” to 1 /
2
” tall section of
the thermocouple. This will ensure that the thermocouple will
energize the pilot valve and maintain the pilot flame. Remember to
replace the cover and fiber washer after adjustments are completed.
To check the calibration of the thermopile, turn the main burner
control knob to OFF. Connect a millivolt meter to the TP and TP TH
connections on the red terminal block on the safety valve. The
thermocouple should generate 200mV (minimum) within 2 minutes of
the pilot flame being lit. 250 mV will provide sufficient power to open
both the pilot valve and main burner valve.
To conserve thermocouple life and reduce gas consumption, the
reading should be no more than 500 mV.
MAIN BURNER AIR/FUEL MIXTURE
Each main burner has an adjustment shutter at the inlet end of the
burner. This collar is locked by a
1 /
4
” hex head screw. Loosen the
screw and rotate the shutter to adjust the amount of combustion air
mixed with the incoming gas as it enters the main burner. Adjust the
fuel/air mixture to produce a steady, blue flame. Re-tighten the lock
screw after the proper mixture has been set.
Fig. 3 Adjust gas pressure
8
121
p/n
4532
4
Op
M
anual Counter
top
Ga
s G
riddle
s
3/8“ to 1/2”
THERMOCOUPLE
LOCKING SCREW
MORE AIR
LESS AIR
SHUTTER
Fig. 4 Adjust pilot flame
Fig. 5 Adjust burner flame