Alto-Shaam 1767-SK Handbuch für Installation, Betrieb und Wartung - Seite 10

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TH E R M O S TAT & I N D I C AT O R
L I G H T S E Q U E N C E
Whenever the start-up procedure has been
completed, the indicator light will indicate the
power ON/OFF condition of the heating cable
and consequently, the cycling of the oven as it
maintains the dialed cavity temperature. If the
indicator light does not indicate after normal
start-up, the main power source and/or the
main power breaker, and/or the oven's control
circuitry must be checked. If a oven
compartment does not hold the temperature as
dialed, calibration of the thermostat must be
checked. (See the paragraph on thermostat
calibration.) If a cooking compartment fails to
heat or heats continuously with the thermostat
off, the thermostat must be initially checked for
proper operation. If all is in order, a continuity
and resistance check of the heating cable should
be made. (See the circuit diagram.)
T R O U B L E S H O O T I N G C H E C K L I S T
TROUBLE
Unit does not operate.
Cooking temperature not correct.
Holding temperature not correct.
Timer runs down, but oven will not
go into HOLD.
Cook thermostat erratic — will not
hold calibration.
Hold thermostat erratic — will not
hold calibration.
Oven goes from cooking temperature
to cold.
Oven will not go into cook cycle when
timer and cook thermostat are ON.
It takes too long to cook
(temperature O.K.).
Cannot control temperature but
thermostats check O.K.

SERVICE SECTION

THERMOSTAT CALIBRATION

The thermostat is precision calibrated at the factory.
no adjustment or recalibration is necessary unless the thermostat has
been mishandled in transit or changed or abused while in service.
A thermostat with a sensing bulb operates on hydraulic pressure.
Consequently, any bending of the bulb results in a change in its
volume and displaces the accuracy of the thermostat calibration.
A thermostat should be checked or recalibrated by placing a
quality temperature indicator at the center of an empty oven cavity.
DO NOT CALIBRATE WITH FOOD PRODUCT IN THE OVEN.
The temperature must be allowed to stabilize at one particular setting
for at least two hours. The center of the thermal swing of the cavity
temperature should approximately coincide with the thermostat
setting. The calibration screw of the thermostat is located in the dial
shaft. With the shaft held stationary, a minute clockwise motion of
the calibration screw appreciably lowers the thermostat setting while
a reverse motion results in the opposite condition. After achieving
the desired cycling of the thermostat, the calibration screw must be
sealed in place with a few drops of sealant. (
EQUIVALENT IS ACCEPTABLE
POSSIBLE CAUSE
Insufficient electric power unit.
Defective plug or cord.
Power switch defective.
Cook thermostat out of calibration.
Hold thermostat out of calibration.
Timer not de-energizing cook circuit.
Cook thermostat.
Hold thermostat.
Hold thermostat.
Timer or contactor.
Heating element open, resulting in
low wattage.
Heating element grounded.
#834
&
LOW TEMPERATURE COOK
.)
Check power source.
Check and repair if necessary.
Replace.
Calibrate.
Calibrate.
Replace timer.
Replace thermostat.
Replace thermostat.
Replace hold thermostat.
With timer turned ON, line
voltage should appear across
term. 2 and 3 of timer. If not,
replace timer.
If line voltage does appear
across term. 2 and 3 of timer, it
should also appear across
holding coil of contactor.
If line voltage does appear
across holding coil, and it
won't close its contacts,
replace contactor.
Replace element.
Replace element.
HOLD SMOKER OVEN
Normally,
RED NAIL POLISH OR
REMEDY
Pg. 9.