17
e) Freeze Timer (dip switch 9 & 10)
CAUTION
Adjust to proper specification, or the unit may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent
possible freeze-up issues. Upon termination of freeze timer, machine initiates the harvest
cycle. After 2 consecutive timer terminations, machine will shut down, possibly indicating
a problem.
The freeze timer is factory adjusted and no adjustment is required.
Dip Switch Setting
Time
(minutes)
No. 9
No. 10
OFF
OFF
60
OFF
ON
50
ON
OFF
70
ON
ON
60
4. Control Board Check Procedure
Before replacing a control board that does not show a visible defect and that you suspect
is bad, always conduct the following check procedure. This procedure will help you verify
your diagnosis.
1) Check the dip switch settings to assure that #3, 4, 7, 8, 9, & 10 are in the factory default
position. Switches 1, 2, 5, & 6 are cleaning adjustments and the settings are flexible.
2) Turn the control switch to ICE and check for proper control voltage. If the red LED is ON,
the control voltage is good. If the red LED is OFF, check the control transformer circuit.
3) Check the 115 volt input at the 10-pin connector. Check the brown wire at pin #10 to a
white neutral wire for 115 volts. (Always choose a white neutral wire to establish a good
neutral connection when checking voltages.) A jumper also feeds 115 volts into pin #7.
If no voltage is present, check the 115 volt supply circuit.
4) The output test switch provides a relay sequence test. Make sure the control switch is
in the ICE position, then press the output test switch. The correct lighting sequence
should be none, 2, 3, 4, 1. Some components (e.g., the compressor) will cycle during
the test. Note that the order of the relays from the outer edge of the board is 1, 4, 3, 2. If
the LEDs light in a different sequence, the control board is bad and should be replaced.
After the output test, the unit automatically resumes normal operation at the 1 minute fill
cycle.
5. Control Board Replacement
The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied
to the K1 connector. If there is a white wire, place the switch in the C position. If this
switch is placed in the wrong position either the compressor contactor will remain
energized with the control switch OFF or the unit will not start.
The dip switches should be adjusted to the factory default settings as outlined in this
manual. 8 must remain in the OFF position.
Summary of Contents for KML-451MAH
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