Service manual

ELECTRIC CONVEYOR OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
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g
e 13 of 24
A. This is done by holdin
g
the “S” key in while
pressin
g
the arrow keys to raise or lower
the temperature. Otherwise the display
shows the current measured temperature.
4. Allow the heat to stabilize at the set point. The
heat should be occasionally turnin
g
off and on.
5. Subtract the temperature tester measured
value from 500 and write down the subtracted
value. This is the offset value that will be
entered into the controller soon.
6. Turn the power off at the oven.
7. Press and hold down “S” key on the control.
8. Turn the power switch on. “PrG” will appear on
the display.
9. Release the “S” key and “PO” will appear on
the display.
10. Press either arrow key until “P85" appears on
the display.
NOTE: P85 must be displayed. It is the only entry
applicable to these units.
11. Press “S” repeatedly until the display shows
“Co1”. (indicates differential between actual
temperature and display temperature)
NOTE: “Co1" only displays for a few seconds then
chan
g
es to display the value.
12. Press either arrow key to chan
g
e the displayed
value to read the subtracted value obtained in
step 5.
13. Press “S” to confirm the value.
14. Press “S” key until the normal temperature
display is shown. The adjustment is now
finished.
TEMPERATURE PROBE
TEST
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the top panel from the control
housin
g
.
2. Remove the lower air distribution panel as
outlined under “COVERS AND PANELS” in
“REMOVAL AND REPLACEMENT OF
PARTS”.
3. Place a thermocouple near the temperature
probe and record the temperature readin
g
.
4. Remove the probe lead wires from the
electronic control.
5. Test the probe with an ohmmeter.
TEMP F
±10% TEMP F
±10%
77 90000 360 822
240 4077 380 656
260 3016 400 529
280 2266 425 424
300 1726 450 334
320 1332 475 266
340 1041
AIR DISTRIBUTION
ADJUSTMENT
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the air distribution panel that needs
adjusted as outlined under “COVERS AND
PANELS” in “REMOVAL AND REPLACEMENT
OF PARTS”.
2. Adjust the panels as outlined below under “TOP
PANEL” and “BOTTOM PANEL”.
3. Reverse procedure to install.
Top Panel
1. If bakin
g
is even, but more or less air is
required on the top of the product.
A. Adjust the air volume screw.
B. Turn the screw clockwise for more air and
counterclockwise for less air.
C. Turn the screws for the left and ri
g
ht
conduits the same number of turns.