Hoshizaki DCM-500BWH-OS - Manual (Page 37)

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6) Refill /Low Water Safety – As ice is produced, the water level in the reservoir drops.
As the water level drops, the upper and lower float switches open. First, the upper
float switch opens. Nothing occurs at this time. When the lower float switch opens,
refill begins. The water control relay de-energizes, the 90 second low water safety
timer begins, and the inlet water valve energizes. The compressor, fan motor, and
gear motor continue to run. When the upper float switch closes, the water control relay
energizes, the 90 second low water safety timer terminates, and the inlet water valve
de-energizes.
If the upper float switch fails to close within 90 seconds after the inlet water valve
energizes, a 150 second shutdown sequence begins. 90 seconds after the 90 second
low water safety timer is complete, the compressor and fan motor de-energize,
60 seconds later the gear motor de-energizes. The inlet water valve continues until the
upper float switch closes.
Diagnosis – Check that the reservoir fills. If not, check the
water supply line, clogged water filters, dirty or sticking float switches, inlet water valve
screen, water control relay contacts, voltage to the inlet water valve, and inlet water
valve solenoid or drain valve leaking.
7) Drain Cycle – "FLUSH" LED is on. 1 hour timer activates the flush cycle and a
150 second shutdown sequence begins. 90 seconds after the 1 hour timer activates,
the compressor and fan motor de-energize, 60 seconds later the gear motor
de-energizes. The drain valve then energizes and remains energized for 0 minutes.
Once the 0 minute drain timer is complete, the 1 hour drain cycle timer resets and
the fill cycle begins.
8) Shutdown – The bin fills and activates the bin control. A 150 second shutdown
sequence begins. After the bin control has been open for 90 seconds, the compressor
and fan motor stop, the agitating motor energizes for 0.6 seconds, and 60 seconds later
the gear motor stops.
Diagnosis: Check that the bin control paddle is activated and
that the bin control switch opens. If the compressor and gear motor fail to stop, check
the bin control (proximity) switch and control board relays.
B. Ice Production Check
To check production, prepare a bucket or pan to catch the ice and a set of scales to
weigh the ice. After the icemaker has operated for 10 to 0 minutes, catch the ice
production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the
batch weight by 144 for the total production in 4 hours. When confirming production or
diagnosing low production, see "III.E. Performance Data."