Service Manual

37
B. LED Lights and Audible Alarm Safeties
Beep occurs and red "POWER OK" LED turns on when control switch is moved to "ICE"
position.
Sequence
Green LEDs 1 through 4 turn on and sequence from initial startup as listed in the table
below. Order of green LEDs from the outer edge of control board is 1, 4, 3, 2.
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max.
1-Minute Fill Cycle 4 WV
Harvest Cycle 1, 4, 2 Comp, FM*, FMR, HGVs, WV 1 minute 20 minutes
Harvest Pump Time
(harvest assist)
1, 3, 2 Comp, FM*, FMR, HGVs, PM 0 seconds 50 seconds
Freeze Cycle 1 Comp, FM/FMR, PM, LLVs 5 minutes freeze timer
setting
Slush Control 1, 3 Comp, FM/FMR, LLVs If S5 dip switch 5 on,
PM off 10 sec. when
thermistor at 36°F (2.2°C)
Pump-Out Cycle 1, 4
†
, 3, 2 Comp, FM*, FMR, HGVs, PM, WV
†
10 seconds 20 seconds
*FM energized if on K1 Connector Pin #9;
†
pump-out timer setting
Alarms
Type Alarm Notes
1
Beep
High Evaporator Temp.
(temperature > 127°F) (53°C)
Check for harvest problem (stuck HGV or relay), hot water
entering unit, stuck HM, or shorted thermistor.
2
Beep
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check thermistor (open), HGV not opening, TXV or LLV
leaking by, low charge, inefficient Comp, or WRV leaking
by.
3
Beep
Freeze Timer
(freeze > freeze timer setting
for two cycles in a row)
Check FS stuck closed (up), WV leaking by, HGV leaking
by, PM not pumping, TXV defective, LLV not opening, low
charge, HMnot bypassing, or inefficient Comp.
To reset above safeties, press "ALARM RESET" button with power supply on.
6 Low Voltage
(92Vac±5% or less)
Red POWER OK LED turns off if voltage protection
operates.
Control voltage safeties automatically reset when voltage
is corrected.
7 High Voltage
(147Vac±5% or more)
Legend: Comp–compressor; FM–fan motor; FMR–fan motor remote; FS–oat switch;
HGVs–hot gas valves; HM–headmaster (C.P.R.); LLVs–liquid line valves;
PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve;
WV–inlet water valve
Test
To perform output test, move control switch to "ICE" position. Press "OUTPUT TEST" button.
Correct green LED lighting sequence is 1, 4, 3, 2. Components (e.g., compressor) cycle
during test. Following test, icemaker resumes operation.
Dip switches must be adjusted per unit’s service manual or Hoshizaki Technical Support
recommendation. S4 dip switch 8 must remain off.