Lincoln Impinger Conveyor Ovens 1454 - Manual (Page 6)

Impinger I -–Adv Digital – Electric Service Manual - International 6
IMPINGER ADVANTAGE ELECTRIC OVENS
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming power supply Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Thermostat, control
box hi-limit
Terminals are normally closed, open at 130
°F (55°C). If
open, reset and test for proper operation. If thermostat
will not hold, and control box temperature is not
exceeding 130
°F (55°C), replace thermostat.
Switch, oven power Check for line voltage supplied to switch. If no voltage is
present, trace wiring back to fuse holder. Check
continuity between switch terminals. Replace switch as
needed.
Motor, main fan Check for line voltage supplied to motor. If no voltage is
present, trace wiring back to oven power switch. Check
motor for opens, shorts or grounds.
WITH POWER OFF: Turn fan blade to check for locked
rotor.
No control box cooling Incoming power supply Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for line voltage supplied to switch. If no voltage
is present, trace wiring back to fuse holder. Check
continuity between switch terminals. Replace switch as
needed.
Cooling fan Check for supply voltage to the cooling fan. If no
voltage is present, trace wiring back to the fuse holder.
If voltage is present and motor does not run, check
motor for opens shorts or grounds.
WITH POWER OFF: Check for locked rotor.
No automatic control
box cooling Incoming power supply Check circuit breaker, reset if required. Check power
plug to be sure it is firmly in receptacle. Measure
incoming power, call power co. if required.
Cooling fan thermostat Check cooling fan thermostat (thermostat closes at
120
°F and opens at 100°F). With cooling fan thermostat
pre-heated, check for continuity
Control box cooling fan
continues to run Cooling fan thermostat See “Cooling fan thermostat” (NOTE: Thermostat will
remain closed if control box temperature remains above
120
°F.
Oven will not heat Main fan If not operating, refer to “Oven fan will not run”
Air pressure switch Check air switch terminals for supply voltage to
terminals NO and COM. If voltage is present on one side
only, check for air tube blockage or misalignment. If
these are okay, adjust air pressure switch or replace
switch as needed.
Oven cavity hi-limit
thermostat Terminals are normally closed, opens at 660
°F (350°C).
If open, reset and test oven for proper operation. If
thermostat will not hold for maximum temperature, and
oven is not exceeding control setting, check for proper
location of the capillary bulb in its spring holder. If above
checks are okay, replace hi-limit thermostat.
Control transformer Check for supply voltage to primary of control
transformer. If no voltage is present, trace wiring back to
oven power switch. If voltage is present, check for