closed position. If there is no voltage to the

 

 

operating coil, but there is high voltage at the

 

 

contactor output, replace the mercury contactor.

Intermittent heating

Thermal/overload of motor

The main fan motor is equipped with internal

 

 

thermal protection and will cease to operate if

 

 

overheating occurs. As the motor overheats and

 

 

then cools, this will cause the oven to cycle on and

 

 

off intermittently. Improper ventilation or lack of

 

 

preventive maintenance may cause this. Also,

 

 

most of the problems listed under “Oven will not

 

 

heat” can cause intermittent failure.

 

 

 

Conveyor will not run

Power supply

Check circuit breakers, reset if required. Check

 

 

power plug to be sure it is firmly in receptacle.

 

 

Measure incoming power, call power co. if

 

 

needed.

 

 

 

 

 

Fuse, 10 Amp

Check, replace if necessary.

 

Fuse holder

Check, replace if necessary.

 

Hi-limit thermostat, oven cavity

Terminals are normally closed. If open, reset

 

 

thermostat and retest. If thermostat will not hold

 

 

for maximum oven temperature, and oven is not

 

 

exceeding temperature setting, check for proper

 

 

location of capillary bulb in its spring holder. If the

 

 

capillary checks okay, replace the hi-limit

 

 

thermostat.

 

 

Power switch

Check continuity between switch terminals.

 

 

Replace switch as needed.

 

Control transformer

Check for supply voltage to the primary of the

 

 

control transformer. If no voltage is present, trace

 

 

wiring back to the oven power relay. If voltage is

 

 

present, check for 24 VAC at the transformer

 

 

secondary. If there is primary voltage but no

 

 

secondary voltage, replace control transformer.

 

Conveyor motor

Check for supply voltage to the conveyor motor. If

 

 

no voltage is present, trace wiring back to the

 

 

primary of the control transformer. If voltage is

 

 

present and the motor will not run, check the

 

 

motor windings for opens or shorts.

 

 

WITH POWER OFF: Check the motor windings as

 

 

follows:

- 240Ω approx.

 

 

Grey to black

 

 

Grey to tan -

240Ω approx.

 

 

Tan to black -

480Ω approx.

 

 

If any of the above fails, replace conveyor motor.

 

Capacitor, conveyor motor

Check for shorts or grounds. Replace capacitor as

 

 

needed.

 

 

 

WARNING: Capacitor has a stored charge,

 

 

discharge before testing.

 

Switch, conveyor reversing

Check continuity between switch terminals.

 

 

Replace switch as needed.

 

Oven control

If there is supply voltage to the motor, and the

 

 

motor, capacitor, and reversing switch check

 

 

good, replace the oven control.

Conveyor motor runs, but

NOTE: Display will indicate

 

 

there is no speed display

“Belt Jam”

 

 

 

Oven control

Check for output voltage from oven control to hall

 

 

effect sensor (sensor is located in conveyor

 

 

motor). Measure voltage at the motor connector,

 

 

red wire and yellow wire. Voltage should be

Impinger II – Advantage Digital Express Service Manual - Domestic

19

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Toro 1131-08H-A, 1133-080-A, 1132-080-A1, TRUE, 1130-080-A1, 1116-080-A1, 1132-08H-A Closed position. If there is no voltage to

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