Hoshizaki KM-630MWF - Manual (Page 24)

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(iv) After Step (iii), de-energize the unit and confirm that the Defrost Timer is in the
minimum position. Disconnect the resistor from the Controller Board, and ener-
gize the unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Re-connect a 1.5 k
W - 3.5 k W resistor to the Connector K3 (pins #1 and #2) after
the first 2 minutes of the defrost cycle.
The unit should start the freeze cycle after 1 minute ± 5 seconds from the resistor
connection.
3) Check the Controller Board by using test program of the Controller Board.
The Output Test Switch “S3” provides a relay sequence test. With power OFF, place
S3 ON and switch power to ICE. The correct lighting sequence should be none, 2, 3,
4, 1, and 4, normal sequence every 5 seconds. S3 should remain in the “OFF” position
for normal operation.
After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrost
cycle, the unit should start the freeze cycle.
(ii) After the above step (i), disconnect the Float Switch leads from the Controller Board
within the first 5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of the
freeze cycle.
(iii) Reconnect the Float Switch Connector to the Controller Board. After the first 5
minutes of the freeze cycle, disconnect the Float Switch leads from the Controller
Board.
At this point, the unit should start the defrost cycle.