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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l
7
Air pressure switch Check air switch terminals for supply voltage to
terminals NO 2 and COM. If voltage is present
on one side only, check for air tube blockage or
misalignment. If these are okay, adjust switch
or replace if necessary.
Oven cavity hi-limit
thermostat
Terminals are normally closed, opens at 660° F
(350° C). If open, push in reset button and
retest. If thermostat will not hold for maximum
oven temperature, and oven is not exceeding
temperature dial setting, check for proper
location of capillary bulb in its spring holder. If
above checks are okay, replace hi-limit
thermostat.
Ignition control Check for proper supply voltage to ignition
control. Check for proper line voltage to the
burner blower motor. This can be checked at
motor connecting plug terminals 2 and 5. If
voltage is present, proceed with next step, if
not, wait 30 seconds, push reset button and try
to restart. If this fails, check wires from
thermostat and burner blower motor to the
ignition control. If all above checks okay,
replace ignition control.
Burner blower motor Check for supply voltage to motor. WITH
POWER OFF: Turn blower wheel to check for
locked rotor. If proper supply voltage is present
at motor connecting plug, terminals 2 and 5,
and motor does not run, replace motor.
Air pressure switch
(burner blower)
Check for proper supply voltage switching from
“NC” to “NO” on ignition control. Check for air
switch adjustment, air tube blockage or
misalignment. If these fail, replace air pressure
switch.
Spark generator A pre-purge time of 30 to 60 seconds occurs
after blower motor starts. Check for supply
voltage at spark generator. If voltage is not
present, check reset button for the ignition
control. If voltage is still not present, replace
ignition control. If there is input voltage but
there is no output voltage, replace spark
generator.
Igniter/sensor assembly Check this assembly for visible damage.
Replace as needed. If there is no visible
damage, check for supply voltage to
igniter/sensor assembly. If there is supply
voltage to igniter/sensor assembly, but there is
no spark, replace igniter/sensor assembly.
Gas valve Gas valve should open when proper supply
voltage is present. If no voltage is present,
check the reset button on ignition control, and
all connections for tightness. If there is still no
voltage at gas valve, replace the ignition
control. If there is voltage present, check for
gas pressure at the gas pressure tap (located
in the gas piping just prior to the burner). If
there is no gas pressure, replace the gas valve.