Wells GAS GRIDDLES, Operation Manual

Page: 10 / 18

TESTING AND CALIBRATION
TESTING AND CALIBRATION TO BE PERFORMED BY QUALIFIED TECHNICIANS ONLY.
A. TESTING GAS PRESSURE
1. Ports for measuring outlet gas pressure are located on the end of each valve, below the red terminal
block. A port is also available on the manifold. To connect a water column gauge, remove the
grease drawer to gain access to the left side valve, remove the allen head plug sealing the test port,
then connect the hose of the gauge.
2. The regulator has an adjustment screw under the cap at the raised center of the regulator body.
Outlet pressure is factory set by the regulator manufacturer for 5 “W.C. (Natural Gas), or 10” W.C.
(Propane Gas).
3. If adjustment is required, remove the cover screw on the regulator, adjust the inner screw counter-
clockwise to increase the pressure or clockwise to decrease.
B. 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.
C. PILOT FLAME ADJUSTMENT
1. 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 thermopile. This will ensure that the thermopile
will energize the pilot valve and maintain the pilot
flame. Remember to replace the cover and fiber
washer after adjustments are completed.
2. To check the calibration of the thermopile, turn the
main burner thermostat knob to OFF. Connect a
millivolt meter to the TP and TP TH connections on
the red terminal block on the safety valve. The thermopile 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 thermopile life and reduce gas consumption, the reading
should be no more than 500 mV.
D. MAIN BURNER AIR/FUEL MIXTURE
Each main burner has an adjustment collar at the inlet end
of the burner. This collar is locked by a
1
/
4
” hex head screw.
Loosen the screw and rotate the collar 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.
When using LP Gas, remember that LP Gas is heavier than air. Sniff at floor level for the
presence of LP Gas. If present, do not attempt to start or light pilots.
8
LOCKING
SCREW
MORE
AIR
LESS
AIR
COLLAR
3/8“ to 1/2”
THERMOCOUPLE
OR
THERMOPILE