18-3
Weekly – Cabinet Slots
Calibrate the top and bottom plates in all four UHC slots by performing the following procedure
with the slots clean, empty and at operating temperature for at least 30 minutes.
1.
Press the temperature key (See Displaying Slot Temperature Information on Page 8-1) to ensure
the setpoint temperature was reached consistently for the 30-minute minimum.
2.
Slide the Atkins sensor into a slot with the sensor facing upward to measure the top heater plate
or downward to measure the bottom heater plate. Move the sensor to the center of the plate. To
get an accurate reading, the sensor must be within
±
1 inch of the center of the plate.
3.
Allow three minutes for the sensor to stabilize.
4.
Read the temperature on the pyrometer. The temperature on the pyrometer should be within
±
5°F (
±
3°C) of the temperature read in the UHC. Press the temperature key once to get the slot
top plate within tolerance
±
5°F
(
±
3°C), check the next plate/slot. If the reading is out of
tolerance, perform the following procedure:
•
Enter the program mode by pressing the Menu key for at least five seconds. Press the page
key until
View____PAGE
appears in the slot controller display.
•
Press the Menu key until SECR Lock _ _ _ _ is displayed. Enter the Service Code,
2 4 7
using the UP and Down arrow keys.
•
Press the Page key to display the slot to be corrected. (For slot 1, the display will read
SLOT___1
.)
•
Press the Menu key until you get to the top or bottom plate for correction. (For a top plate the
display should read
TOP OFST 0
).
•
Press the Up or Down arrow key to enter 1°F/C at a time until the correct offset is achieved.
Example: If the RTD measures 150°F (65°C) and you measure 155°F (68°C), enter +5°F
(+3°C) to achieve the offset. If you measure 145°F (63°C) and the RTD measures 150°F
(66°C), enter –5°F (-3°C) to achieve the offset.
Annually – Clean Air Exhaust Fans
CAUTION
Failure to disconnect the power at the wall power supply could result in serious injury or
death. The cabinet power switch DOES NOT disconnect all incoming power to the cabinet.
This service should only be performed by qualified service personnel.
CAUTION
Use caution when handling the cabinet. Each cabinet weighs over 200 pounds.
Maneuvering/handling the unit should only be attempted with at least two people.
Summary of Contents for Universal Holding Cabinet
Page 46: ...17 1 17 Wiring Diagram UHC...