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Impinger II – Advantage Digital Express Service Manual - Domestic
13
occur. If flame is not detected, the ignition control will
shut off and lock out. To reset the ignition control,
turn off the power switch for 45 seconds, then turn
the switch on to re-try ignition. The ignition control
requires a minimum of 0.8 DC microamps to prove
flame. To check flame sensing operation, connect a
digital multimeter (capable of measuring DC
microamps) between the “ground” terminal on
ignition control and the ground lead.
NOTE: This is a current measurement and the meter
must be connected in series
If these readings are not achieved, replace hot
surface igniter.
NOTE: The DC microamp test must be conducted
with the oven in low flame (bypass) operation. Set
the temperature control to the lowest setting.
Power supply If there is sufficient microamp current, but the flame
will not stay lit, check for proper polarity of the
120VAC power supply.
Ignition control If there is sufficient microamp current, and the
120VAC polarity is correct, but the flame will not stay
lit, replace the ignition control.
NOTE: Check for proper ground connection on
ignition control.
NOTE: Flame should be on at
this time
Low flame is on,
but no main flame
Control transformer Check for 120VAC supply to the primary of the
control transformer. If no voltage is present, trace
wiring back to the main power switch. If voltage is
present, check for 24VAC at the transformer
secondary. If there is primary voltage, but no
secondary voltage, replace the control transformer.
Oven control Check for 24VAC supply to control. If no voltage is
present, trace wiring back to control transformer. If
24VAC is present, check for a read-out on the
display. If there is 24VAC supplied, but there is no
read-out on the control display, replace the oven
control.
If there is a read-out on the control, set the control to
maximum temperature (see installation operations
manual for temperature adjustment). With the control
set at maximum temperature, check for 120VAC at
the temperature regulation valve. If there is voltage at
the temperature regulation valve, proceed to
“Temperature regulation valve” for next check. If
there is no voltage at the temperature regulation
valve, trace wiring back to the oven control. If there is
no voltage output at the oven control, check the read-
out on the control. If the control reads “PROBE
FAIL”, this indicates that the thermocouple has failed
or become disconnected from the oven control.
Thermocouple Check to be sure that the thermocouple is securely
connected to the oven control. If the thermocouple is
connected to the oven control, and the control
indicates “PROBE FAIL”, disconnect the
thermocouple from the oven control and measure the
resistance of the thermocouple. The thermocouple
should read approx. 11Ω. If these readings are not
achieved, replace the thermocouple. If these
readings are correct, proceed.