Sequence Of Operation; Startup Cycle; Harvest Cycle; Freeze Cycle - Hoshizaki IM-500SAA Service Manual

B. Sequence of Operation

1. Startup Cycle

When power supply is turned on, "on" appears on CB display and HGV energizes.
30 sec. later, harvest cycle starts.
• If the "RESET" button is pressed during 30-sec. startup cycle time, startup cycle ends
immediately and harvest cycle starts.

2. Harvest Cycle

HGV continues. Comp and AMD energize. WV energizes as listed in table below.
CB
Note
Setting
WV Delay NA
WV Time after 10, 11
WV Delay
WV Time NA
when
ET≥41°F
(5°C)
(CB Setting 1)
Note: ET temperature is recorded 30 seconds after PM energizes in the preceding
freeze cycle. Water temperature correction value (CB Setting 13) is added to ET
temperature and this is used as WT value.
If CBT≤81°F (27°C) (CB Setting 74) at beginning of harvest cycle, HGV repeatedly
energizes 40 sec./de-energizes 40 sec. If CBT≥118°F (48°C) (CB Setting 34) at
beginning of harvest cycle, FM operates continuously in harvest cycle.
When ET reaches harvest cycle termination temperature (CB Setting 1) of 41°F (5°C) ,
HGV de-energizes, FM and AMU energize. Comp continues. WV energizes as listed in
table above. Harvest cycle is complete when actuator motor PS indicates water tank is
fully closed.

3. Freeze Cycle

Comp and FM continue. WV energizes for total time of WV Time 1 and WV Time 2 listed
in table below. PM energizes after PM delay listed in table below.
CB
Note
Setting
PD 12
WV Time 1
and PM Delay
PD 15
WV Time 2
FD 12
WV Time 1
and PM Delay
FD 15
WV Time 2
Initial Harvest Initial Harvest after Bin Control
after Power On
All WT WT>48°F (9°C) WT≤48°F (9°C) WT>48°F (9°C) WT≤48°F (9°C)
20 sec. 0 sec.
95 sec. 10 sec.
(CB Setting NA)
10 sec. 0 sec.
Initial Freeze Initial Freeze after Bin Control
after Power On
All WT All WT
30 sec. × 2 30 sec. × 2
22 sec. × 2 22 sec. × 2
60 sec. 60 sec.
44 sec. 44 sec.
Initiated Restart
0 sec.
95 sec.
10 sec.
Initiated Restart
9
Normal Harvest
20 sec. 20 sec.
30 sec. 95 sec.
0 sec. 10 sec.
Normal Freeze
All WT
30 sec.
22 sec.
60 sec.
44 sec.