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E. Sequence of Operation
Hoshizaki utilizes a solid state timer board to switch the components on and off as
needed. The sequence is as follows:
1. Startup
Flush switch in "ICE" position, power switch in "ON" position. FR energizes.
2. Fill Cycle
WV opens and the reservoir lls with water until UF/S closes. Note: GM will not start
unless UF/S is closed. For details, see "IV. Service Diagnosis".
3. Ice Purge Cycle (60 seconds)
WCR energizes, closing the low water safety circuit and de-energizing WV. GMR
energizes (clear relay located on TB). GM starts and GMPR energizes. GM runs for 60
seconds to clear any ice from the evaporator.
Note: Low water safety circuit is terminals 3 and 4 on TB.
4. Freeze Cycle (Ice Making Process)
CR energizes (black relay located on TB). Comp and FMS energize. As the water in the
evaporator cools, ice starts forming within 4 to 6 minutes. This time frame depends on
the inlet water and ambient temperature conditions.
UF/S and LF/S operate WV as needed to continue the ice making process. This
continues until BC shuts the ice maker down or power is turned off to the unit.
5. Shutdown:
BC activates (opens). FR de-energizes, FWV energizes. Approximately 90 seconds after
BC activates, Comp and FMS de-energize, one minute later GMPR de-energizes and
GM stops.
Legend: BC–bin control; Comp–compressor; CR–compressor relay; FMS–self-
contained fan motor; FR–ush relay; FWV–ush water valve; GM–gear motor;
GMPR–gear motor protect relay; GMR–gear motor relay; LF/S–lower oat
switch; TB–timer board; UF/S–upper oat switch; WCR–water control relay;
WV–inlet water valve.
F. 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 unit has operated for 10 to 20 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 24 hours.