Duke 155433P, Installation, Operation, Parts & Maintenance Manual

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MAINTENANCE INSTRUCTIONS
These maintenance instructions are for the use of qualified
service personnel only. Service by other than qualified
personnel may result in damage to the oven and/or injury to
the operator.
Qualified service personnel are those individuals, firms,
companies or corporations which either in person or through
an agent are engaged in and responsible for repair or
servicing of commercial food preparation equipment, who
are experienced in such work, familiar with all precautions
required, and have complied with all requirements of state
and local authorities having jurisdiction.
If you should require assistance in the selection of a qualified
service agency, please contact Duke Manufacturing Co.'s
Service Department at 800-735-3853.
A. Adjustments
Quite often malfunctions which are attributed to defects may
be repaired by adjusting certain parts rather than replacing
them.
B. Door Adjustment
The door switch is located behind the lower front cover, on
the right or left side. (Fig.1) The door switch (A) is activated
by a cam (B) which is mounted to the door's hinge pin with a
set screw. Position the door so it is nearly closed but not
latched. To adjust the cam:
•
Loosen the set screw and rotate the cam until you
hear the switch click.
•
Tighten the set screw in the cam.
•
Test the door to make certain the switch will make
contact with the doors closed.
•
Replace the compartment cover.
C. Lubrication
The door plunger assembly requires periodic lubrication by
the operator to ensure smooth, trouble-free operation.
Application of a Food Grade High Temperature Lubricant
such as Lubriplate FGL-1 is recommended at least
bimonthly. Apply lubricant to the plunger and strike plate
sparingly. If necessary, lubricate at more frequent intervals.
D. Back-up thermostat calibration check:
•
Turn the oven on by turning the Power Switch to
the ON position.
•
Open the doors and place a thermocouple in the
center of the middle oven rack. A reliable mercury-
type thermometer can be substituted if a pyrometer
is not available.
•
Turn the power switch to the off position.
•
Turn the thermostat dial to 375ºF (177ºC). Allow
the oven to preheat ½ hour.
•
Note the maximum and minimum temperatures
through several cycles.
•
If the reading on the pyrometer (or thermometer) is
less than 10ºF different from the setting of the
thermostat, no adjustment is needed. If this reading
is more than 10ºF, proceed with calibration
procedure.
To Recalibrate:
•
Remove the thermostat knob by loosening the
setscrew and pull the knob forward. Take care not
to rotate the thermostat stem, which will change the
setting.
•
With a very small screwdriver, turn the screw
located in the bottom of the hollow of the stem
clockwise
to lower the temperature of
counterclockwise to raise the temperature. DO
NOT allow the stem of the thermostat to rotate as
your turn the screw.
Caution: Maximum turn of screw “A” is 1-1/2
turns – clockwise or counter-clockwiase.
This thermostat is a direct-acting (opens on temperature rise)
device.