SP8016-1005
ACCU-STEAM SERVICE MANUAL
PAGE 14
FLAME SENSE MEASUREMENT
The ACCU-STEAM gas griddle has a flame sensing circuit to determine if the system has proper
combustion. When the system is turned on gas is sent to the pilot burner and an electronic
ignition tries to ignite the griddle. The griddle then checks to see if flame is established in the
pilot burner. If the flame sense feedback voltage is within the proper range the system will ignite
the main burners and they stay on until the thermostat is satisfied. The griddle flame sense
continues to monitor the voltage and as long as it within the proper range the griddle will stay on.
If the flame sense voltage falls below the threshold the griddle will go into lock out and will shut
down the griddle. Cycling the on/off switch will restart the ignition and flame sense test. If it fails
again you may need to troubleshoot the ignition/flame sense section.
TROUBLEShOOTING
How to make a diagnosis:
1. Determine that power is present at the griddle
2. Determine that gas is supplied at the proper pressures to the unit.
3. Install an inch-units H2O manometer onto the port on the side of the main gas regulator valve
and onto the pressure tap outboard of the pilot regulator.
4. Install a flame-sensing probe into the flame sense circuit.
a. A meter with micro amp (<A) selection or a micro amp adapter must be place in series
with the orange flame sense wire. To check micro amps, disconnect the orange wire
from the flame rod, connect the amp meter in series with the flame sensing rod
terminal and the orange wire from the wiring harness.
b. An Accutemp volt-measuring adapter P/N FT0003 (meter set for millivolts) is placed in parallel
with the orange flame sense circuit. Attach one end of the adapter to the orange wire and the
other to ground.
5. Turn the unit on (Power lamp is lit)
6. If the pilot burner is not lighting and there is no spark, check for 24 VAC input to the ignition
module.
a. If there is 24VAC present at the ignition module and all of the ground connections are
good, check the ignition cable for an open or a short to ground.
b. If there is 24VAC present at the ignition module and all of the ground connections and
the ignition cable are good, test for spark by disabling the main regulator gas valve and
place the ignitor cable close to ground. Turn the griddle ON. If there is no spark,
replace the ignition module.
c. If there is a spark, check the ignitor probe spark gap on the pilot burner. Adjust, if
necessary. If the probes look badly oxidized, replace the probes.
7. If there is spark but no gas to the pilot regulator, check for 24VAC at the gas valve coil. If
24VAC is not present at the coil of the main regulator gas valve, and the connecting harnesses
are good, replace the ignition module.
8. If 24VAC is present at the gas valve coil and no gas is flowing to the pilot regulator, replace
the main regulator gas valve. When changing the valve, check for debris in the gas line and
valve. Ensure that a drip leg is installed before the unit.
regulator.
TESTING
