Hoshizaki F-300BAF E. Sequence of Operation, F. Ice Production Check, Startup, Fill Cycle

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 fills 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–flush relay; FWV–flush water valve; GM–gear motor; GMPR–gear motor protect relay; GMR–gear motor relay; LF/S–lower float switch; TB–timer board; UF/S–upper float 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.

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