Hoshizaki 73180 User Manual

3. Shutdown

2. Freeze Cycle

Bin Full

Power Switch
"ON"

BC open
BCH continues
Comp de-energized
FM de-energized
GM de-energized
WV de-energized

closed

BC closed
LF/S closed
UF/S closed
BCH continues
Comp energized
FM energized
GM energized
WV de-energized

BC closed
UF/S open
LF/S open
FT starts (90 sec.)
BCH continues
Comp continues
FM continues
GM continues
WV energized

BC closed
UF/S open
LF/S open
BCH energized
WV energized

1. Fill Cycle

BC closed
LF/S closed
UF/S closed
FT terminated
BCH continues
Comp continues
FM continues
GM continues
WV de-energized

Low Water Safety

BC closed
UF/S open
FT exceeded
BCH continues
WV continues
Comp de-energized
FM de-energized
GM de-energized

Refill

FT (in TDR)
Maximum 90 seconds

When UF/S closes,
icemaker restarts at
2. Freeze Cycle.

90 seconds

FT exceeded

BC open

2. Auxiliary Codes A-2 and Later

After the power switch is placed in the "ON" position, the steps in the sequence are as
outlined below.

a) Fill Cycle

LF/S and UF/S open, BCH and WV energize. LF/S closes. Nothing happens at this time.
Reservoir continues to fill until UF/S closes.

b) Freeze Cycle

UF/S closes. BCH remains energized. WCR, TDR, GM, FM, CR, and Comp energize. WV
de-energizes. Ice production starts 4 to 6 minutes after Comp energizes depending on
ambient and water conditions. F/S controls WV to refill as needed during the freeze cycle.
The freeze cycle continues until BC shuts down the icemaker or power is turned off to
the icemaker.

Refill: As ice is produced, the water level in the reservoir drops and UF/S

opens. When UF/S opens, a latching circuit through LF/S and WCR keeps WCR, TDR,
GM, FM, CR, and Comp energized. When LF/S opens, WCR de-energizes, cutting power
to TDR terminal #5 (O wire) and starting FT. WV energizes. Water fills the reservoir, UF/S
closes. WCR energizes, restoring power to TDR terminal #5 (O wire) and resetting FT.
WV de-energizes. If UF/S remains open longer than 90 seconds, FT terminates, cutting
power to TDR terminal #9 (R wire). GM, FM, CR, and Comp de-energize. WV remains
energized until UF/S closes.

c) Bin Control Thermostat Shutdown

Ice fills storage bin to level of BC. BC opens within 10 seconds after ice contact. When
BC opens, BCH remains energized. WCR, TDR, GM, FM, CR, and Comp de-energize.
When ice level lowers and BC closes, the icemaker starts operating again.

C-100BAF Series Sequence Flow Chart and Component Operation

(auxiliary codes A-2 and later)

Legend:

BC–bin control thermostat; BCH–bin control heater; Comp–compressor;

CR–compressor relay; FM–fan motor; FT–90-second fill timer (low water safety;
internal to TDR);

GM–gear motor; LF/S–lower float switch; TDR–time delay relay;

UF/S–upper float switch; WCR–water control relay; WV–inlet water valve